CA2104715C - Portable radiant heater for performing splices in waterstops - Google Patents
Portable radiant heater for performing splices in waterstopsInfo
- Publication number
- CA2104715C CA2104715C CA002104715A CA2104715A CA2104715C CA 2104715 C CA2104715 C CA 2104715C CA 002104715 A CA002104715 A CA 002104715A CA 2104715 A CA2104715 A CA 2104715A CA 2104715 C CA2104715 C CA 2104715C
- Authority
- CA
- Canada
- Prior art keywords
- heating
- heat
- waterstop
- sections
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/84—Specific machine types or machines suitable for specific applications
- B29C66/861—Hand-held tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface direct heating of the surfaces to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1464—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators
- B29C65/1467—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/114—Single butt joints
- B29C66/1142—Single butt to butt joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/524—Joining profiled elements
- B29C66/5241—Joining profiled elements for forming coaxial connections, i.e. the profiled elements to be joined forming a zero angle relative to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
- B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/18—Surface bonding means and/or assembly means with handle or handgrip
Abstract
A portable radiant heating apparatus is provided for performing splices in waterstops. The heating apparatus includes a pair of radiant quartz heating elements that are mounted intermediate the end members of a generally rectangular-shaped frame. The heating elements are preferably positioned in parallel fashion one above the other. Heat deflecting shields are mounted to the top and bottom frame members proximate to the heating elements to concentrate the radiant heat along the sides of the heating apparatus. A splicing operation is performed by positioning the ends of two waterstop sections to be joined adjacent to and on opposite sides of the heating apparatus so that the ends of the two waterstop sections are exposed to the radiant heat from the heating apparatus. Once the waterstop sections have been sufficiently heated to cause the ends thereof to begin to melt, the waterstop sections are removed from the heating apparatus and the ends therefor pressed and held together until the waterstop material cools, thereby forming a water-tight seam.
Description
~1 ~47i~ -., PORTA~LE RADIANT HEATER FOR
~ORMING 8PLICER IN WA~ER8TOP
~ack~,Gu~ of the Invention 1. Technic~l Field This invention relates generally to heaters for performing splicing operations in waterstops and, more particularly, to a portable radiant-type heating apparatus for such purposes.
~ORMING 8PLICER IN WA~ER8TOP
~ack~,Gu~ of the Invention 1. Technic~l Field This invention relates generally to heaters for performing splicing operations in waterstops and, more particularly, to a portable radiant-type heating apparatus for such purposes.
2. Discu9sion Waterstops are frequently used in the construction industry for providing a water-tight seal between adjacent layers or slabs of concrete such as between wall-to-wall, or wall-to-floor, junctions and expansion junctions. Typical waterstops are made of a resilient plastic or rubber material, such as polyvinyl chloride (PVC), ~nd generally have some sort of integral supporting - h~r6. The integral supporting members generally have laterally extending portions which are attached to reinforcing rods of the adjacent slabs prior to the pouring of concrete. The slabs of concrete are then formed with the waterstop integrally embedded therein to thereby provide a water-tight seal between the slabs of concrete. A detailed discussion of the structure and function of a typical waterstop is contained in U.S. Patent No. 4,285,180 issued on August 25, 1981 to Hinton et al. and entitled "Waterstops".
Waterstops are generally available in rolls of flat preformed sections which frequently require splicing where adjacent sections intersect. For example, it may be necessary ~ 21~t~
to splice the vertically oriented waterstop bridging the joint between two adjacent wall sections with the horizontally oriented waterstop at the juncture between the walls and the floor. The resulting spliced waterstop configuration is formed to substantially match the configuration between the slabs or layers of concrete where a continuous water-tight seal is desired.
Consequently, contractors are frequently required to perform various splice configurations, such as straight butt splices, T-shaped, L-shaped, cross-shaped, and other special configurations as needed to ensure a continuous waterstop seal. In practice, the special junction configurations are typically custom ordered from the waterstop manufacturer so that the contractor need only perform the simple butt-type splices to the ends of the special junction configurations in the field. However, this practice, while simplifying the type of splice performed, multiplies the total number of splices required to be performed by the contractor. Consequently, the efficiency with which the contractor can perform a splicing operation becomes extremely important.
Conventional waterstop splicing techniques generally employ a heated splicing iron for directly contacting and melting a pair of adjacent edges of two sections of waterstop. The adjacent melted edges of waterstop are then pressed together and cooled to harden and thereby form a continuous water-tight seal.
Conventional splicing irons have generally employed resistance heating elements which are in direct thermal contact with a conductive metal casing. The conventional splicing iron is '' i ' ',, " . ', ' ' :
. .
. . . .
:
: :
2~7~
heated and positioned to directly contact the edges of waterstop to be spliced together.
The direct contact of the conventional splicing iron with the adjacent edges of waterstop may burn the PVC or other S resilient material. The burned material may weaken the waterstop seal and further cause a charring effect and/or leave undesired contA inAnts within the seal. In addition, a conventional splicing iron usually reguires 15 to 20 minutes to heat up and typically reaches a -Yi temperature of approximately 480~ F.
The rather lengthy heat-up time is time consuming and therefore costly to the contractor, especially when multiplied over hundreds of splices. In addition, the maximum temperature of conventional splicing irons may be inadequate to effectively perform waterstop splicing in very cold weather conditions which are common in the construction business.
It is therefore an object of the present invention to provide for an improved heating apparatus for performing splices in waterstops which does not suffer from the above-mentioned limitations associated with the conventional splicing iron. In particular, it is an object of the present invention to provide a portable radiant heating apparatus for performing splices in waterstops which does not require direct physical contact with the edges of the waterstop. In addition, it is another object of the present invention to provide a portable radiant heating apparatus which rapidly generates very high temperature radiant heat and therefore may be effectively and efficiently employed even in adverse weather conditions.
21~7~
~ummarv of the Invention In accordance with the teachings of the present invention, an improved radiant heating apparatus is provided for performing splices in waterstops. The heating apparatus includes a pair of radiant heating elements for generating radiant heat sufficient to uniformly soften the ends of adjoining sections of waterstop positioned in close proximity to and on opposite sides of the heating apparatus. A support ~cs hly is provided for mounting the pair of radiant heating elements in a vertically spaced, horizontal orientation. Heat shields are located above and below the heating elements to concentrate the radiant heat in the regions along opposite sides of the heating elements. A splice is performed by positioning the juxtaposed ends of adjoining waterstop sections in the heated regions along the sides of the lS heating apparatus until the ends of the waterstop material are sufficiently softened to thereafter permit the two ends sections to be joined together and cooled to form a welded seam.
Brief D-soript~on of the Drawings Other objects and advantages of the present invention will become apparent to those skilled in the art upon reading the following detailed description which makes reference to the drawings in which:
FIG. 1 is a diagram of a conventional splicing iron forming a waterstop splice in accordance with the prior art;
FIG. 2 is a perspective view of the portable radiant heater in accordance with the present invention;
- , : . . . . ... . .
: - . , ~' : ' .:
21~$7:l~
FIG. 3 is a cross-sectional view of the portable radiant heater taken along line 3-3 in FIG. 2 while performing a waterstop splice;
FIG. 4 is an electrical wiring circuit diagram for the portable radiant heater in accordance with the present invention;
and FIG. 5 illustrates a waterstop splice formed with the portable radiant heater in accordance with the present invention.
D-tailed DeJcriDtion of th- Preferred Embodiment A conventional prior art splicing iron 10 which is typically used for performing splices in waterstops is shown in FIG. 1.
The conventional splicing iron 10 comprises an insulated handle 16 connected to a generally rectangular-shaped heat-conductive metal casing which encloses and is in thermal contact with electrical resistance heating elements (not shown). The metal casing of the splicing iron 10 presents first 12 and second 14 heated contact surfaces on opposite sides thereof. In addition, conventional splicing irons generally require the addition of a Teflon~ fabric cover that is placed over the casing to prevent melted portions of the waterstops from sticking to the heated contact surfaces 12 and 14.
In accordance with the conventional splicing technique, the splicing iron 10 i8 positioned between the opposing ends of two waterstop sections 18 and 20. The edge surfaces 22 and 24 of the two waterstop sections 18 and 20, respectively, are then brought into contact with the heated contact surfaces 12 and 14 of the splicing iron 10, and held against the splicing iron until the _5_ 21~7~
: ' ends 22 and 24 of the waterstop sections 18 and 20 begin to melt.
Thereafter, the splicing iron 10 is removed and the melted edges 22 and 24 are pressed together and allowed to cool to thereby complete the formation of a water-tight splice. While the conventional splicing iron lo has been found to be adequate, it does suffer from the numerous drawbacks discussed above.
Turning now to FIG. 2, a portable radiant heater 30 in accordance with the present invention is shown. The radiant heater 30 includes a first heating element 32 and a second heating element 34. The first and second heating elements 32 and 34 preferably comprise quartz heating bulbs which have a straight tube-shaped configuration. The quartz heating elements 32 and 34 employed in the preferred embodiment are manufactured by Tempco Electric Heater Corporation, and are rated to provide 900 watts of power from a conventional 120-volt AC power source. The quartz heating elements are capable of attaining temperatures in cess of 2,000~ F. within approximately 90 seconds.
Consequently, the present heater 30 is able to reach its operating temperature much more quickly than prior art heating irons which rely upon conventional electrical resistance heating elements.
The quartz heating elements 32 and 34 are horizontally disposed and arranged so that the second heating element 34 is located directly above and parallel to the first heating element 32 and separated therefrom by first and second stop blocks 40 and 42 located at opposite ends of the heating elements. The heating elements 32 and 34 are mounted in a rectangular-shaped frame comprised of end support members 36 and 38 which are , ,, ' , ~.', ' .
, 2~ 0~7~
interconnected by top and bottom frame members 46 and 44. The end support members 36 and 38 have mounted thereon plug-in female receptacles (not shown) for mechanically receiving and making electrical connection to the male terminals on the ends of the heating elements 32 and 34. End covers 72 and 74 are provided for enclosing the receptacles and the associated electrical circuitry described below. A pair of support feet 80 and 82 is included to provide stability.
A handle assembly provides convenient means for transporting the heater 30 and comprises a wooden handle 70 that is mounted to the heater 30 via a pair of brackets 64 and 66 that are bolted to a handle support member 62 that is in turn fastened to the top frame member 46.
The heater 30 preferably includes a pair of heat-reflecting shields 48 and 54 to concentrate and direct the radiated heat laterally outward from the sides of the heater. In particular, a first longitudinal, arcuate-shaped heat shield 48 is positioned directly beneath the lower heating element 32 and is mounted to the bottom frame member 44 via a pair of spacers 50 and 52. A
similarly configured second heat shield 54 is positioned directly above the upper heating element 34 and is mounted to the top frame member 46 via a pair of spacers 56 and 58. As depicted in FIG. 3, the heat shields 48 and 54 reduce the amount of heat that radiates downward and upward from the lower 32 and upper 34 heating elements, respectively.
An ON/OFF switch 76 i~ mounted to end cover 74 and controls the application of power to the radiant heater 30. The switch 76 preferably has a built-in neon pilot light which is 21~47~5 illuminated when the radiant heater 30 is energized. An electrical power cord 78 emanates from the opposite end cover 72 that is adapted to be plugged into a conventional 115-volt AC
outlet. The electrical wiring diagram for the present radiant heater 30 is shown in FIG. 4. As shown in the diagram, power is supplied to the heating elements 32 and 34 through switch contacts 94 of ON/OFF switch 76. The heating elements 32 and 34 are connected in parallel with each other so that the remaining heating element will continue to function in the event that one of the elements burns out.
With particular reference to FIGS. 3 and 5, the preferred method of forming a splice between two waterstop sections using the radiant heater 30 according to the present invention will now be described. The heater elements 32 and 34 generate radiant heat, a substantial portion of which radiates outwardly from the sides of the radiant heater 30 to provide a first heated region 84 on one side and a second heated region 86 on the opposite side. The first and second heated regions 84 and 86 provide radiating heat that is sufficient to melt the resilient waterstop material.
In operation, the radiant heater 30 is positioned between the ends of two adjacent sections of waterstop 18 and 20. The end of the first waterstop 18 is preferably placed on top of a first block 88 so as to properly position the edge 22 of the waterstop 18 within the first heated region 84. Likewise, the end of the second waterstop section 20 is placed on top of a second block 90 so as to properly position the edge 24 of the second waterstop 20 within the second heated region 86.
21~7.~ ~
The opposing edge portions 22 and 24 of the two waterstop sections 18 and 20 are simultaneously heated until the edge portions 22 and 24 soften and begin to melt. This transition in the state of the edge portions 22 and 24 can generally be accurately detected by the glossy appearance the resilient waterstop material assumes as it beqins to melt. When the edge portions 22 and 24 have been adequately melted, the waterstop sections 18 and 20 are removed from the heater and pressed together as shown in FIG. 5, causing the formation of a bead of material 92 along the seam between the two sections. The sections 18 and 20 are then held together in the position shown in FIG. 5 for an amount of time, typically 5 - 10 seconds, adequate to allow the bead of liquified material 92 to cool and harden, thereby forming a water-tight seam.
Significantly, it will be appreciated that, due to the substantial amount of radiant heat produced by the present heater 30, it is unnecessary for the waterstop sections 18 and 20 to actually contact the heater in order to properly melt the edges 22 and 24. Moreover, by virtue of the radiant nature of the heating process, the end portions of the waterstop sections 18 and 20 adjacent to the edges 22 and 24 which are exposed to the heated regions 84 and 86 also absorb a substantial amount of heat energy. Concequently, when the waterstop sections 18 and 20 are removed from the heater 30, the edges 22 and 24 do not cool as quickly, thereby providing the operator with more time to carefully align the two waterstop sections 18 and 20 when joining them together as shown in FIG. 5. With conventional heating irons, on the other hand, the heating of the ends of the 2lo~
waterstop sections 18 and 20 is much more localized along the facing edges 22 and 24 of the waterstops. Therefore, the edges 22 and 24 are prone to cool and harden much more rapidly after being removed from the heating iron, particularly in cold weather conditions, thus providing the operator with very little time to properly position the waterstop sections and complete the splicing operation. Consequently, there is the tendency for operators under such circumstances to leave the waterstop sections 18 and 20 in contact with the heating iron longer in an attempt to more thoroughly melt the edge portions. This practice, however, greatly increases the likelihood of burning the edges 22 and 24 of the waterstops which introduces contaminants into the seam 92 and thereby increases the likelihood of a faulty seam. As a result, operators are much less apt to burn the edges 22 and 24 of the waterstop sections 18 and 20 using the radiant heater 30 of the present invention.
In accordance with a preferred embodiment of the present invention, the quartz radiant heating elements 32 and 34 are approximately 18 inches long and one-half inch in diameter.
Consequently, the heating elements 32 and 34 provide an effective heating length of approximately 16-1/2 inches which is sufficient to perform splices in waterstops up to 12 inches in width.
However, the present invention may employ radiant heating elements of greater heating length to handle wider strips of waterstops, if necessAry, without departing from the scope of this invention. In addition, while the preferred embodiment of the invention has been described as comprising a pair of quartz 21~7~5 radiant heating elements 32 and 34, other configurations may be provided without departing from the scope of the invention.
While the above description constitutes the preferred embodiment of the invention, it will be appreciated that the invention is susceptible to modification, variation, and change without departing from the proper scope or fair meaning of the accompanying claims.
Waterstops are generally available in rolls of flat preformed sections which frequently require splicing where adjacent sections intersect. For example, it may be necessary ~ 21~t~
to splice the vertically oriented waterstop bridging the joint between two adjacent wall sections with the horizontally oriented waterstop at the juncture between the walls and the floor. The resulting spliced waterstop configuration is formed to substantially match the configuration between the slabs or layers of concrete where a continuous water-tight seal is desired.
Consequently, contractors are frequently required to perform various splice configurations, such as straight butt splices, T-shaped, L-shaped, cross-shaped, and other special configurations as needed to ensure a continuous waterstop seal. In practice, the special junction configurations are typically custom ordered from the waterstop manufacturer so that the contractor need only perform the simple butt-type splices to the ends of the special junction configurations in the field. However, this practice, while simplifying the type of splice performed, multiplies the total number of splices required to be performed by the contractor. Consequently, the efficiency with which the contractor can perform a splicing operation becomes extremely important.
Conventional waterstop splicing techniques generally employ a heated splicing iron for directly contacting and melting a pair of adjacent edges of two sections of waterstop. The adjacent melted edges of waterstop are then pressed together and cooled to harden and thereby form a continuous water-tight seal.
Conventional splicing irons have generally employed resistance heating elements which are in direct thermal contact with a conductive metal casing. The conventional splicing iron is '' i ' ',, " . ', ' ' :
. .
. . . .
:
: :
2~7~
heated and positioned to directly contact the edges of waterstop to be spliced together.
The direct contact of the conventional splicing iron with the adjacent edges of waterstop may burn the PVC or other S resilient material. The burned material may weaken the waterstop seal and further cause a charring effect and/or leave undesired contA inAnts within the seal. In addition, a conventional splicing iron usually reguires 15 to 20 minutes to heat up and typically reaches a -Yi temperature of approximately 480~ F.
The rather lengthy heat-up time is time consuming and therefore costly to the contractor, especially when multiplied over hundreds of splices. In addition, the maximum temperature of conventional splicing irons may be inadequate to effectively perform waterstop splicing in very cold weather conditions which are common in the construction business.
It is therefore an object of the present invention to provide for an improved heating apparatus for performing splices in waterstops which does not suffer from the above-mentioned limitations associated with the conventional splicing iron. In particular, it is an object of the present invention to provide a portable radiant heating apparatus for performing splices in waterstops which does not require direct physical contact with the edges of the waterstop. In addition, it is another object of the present invention to provide a portable radiant heating apparatus which rapidly generates very high temperature radiant heat and therefore may be effectively and efficiently employed even in adverse weather conditions.
21~7~
~ummarv of the Invention In accordance with the teachings of the present invention, an improved radiant heating apparatus is provided for performing splices in waterstops. The heating apparatus includes a pair of radiant heating elements for generating radiant heat sufficient to uniformly soften the ends of adjoining sections of waterstop positioned in close proximity to and on opposite sides of the heating apparatus. A support ~cs hly is provided for mounting the pair of radiant heating elements in a vertically spaced, horizontal orientation. Heat shields are located above and below the heating elements to concentrate the radiant heat in the regions along opposite sides of the heating elements. A splice is performed by positioning the juxtaposed ends of adjoining waterstop sections in the heated regions along the sides of the lS heating apparatus until the ends of the waterstop material are sufficiently softened to thereafter permit the two ends sections to be joined together and cooled to form a welded seam.
Brief D-soript~on of the Drawings Other objects and advantages of the present invention will become apparent to those skilled in the art upon reading the following detailed description which makes reference to the drawings in which:
FIG. 1 is a diagram of a conventional splicing iron forming a waterstop splice in accordance with the prior art;
FIG. 2 is a perspective view of the portable radiant heater in accordance with the present invention;
- , : . . . . ... . .
: - . , ~' : ' .:
21~$7:l~
FIG. 3 is a cross-sectional view of the portable radiant heater taken along line 3-3 in FIG. 2 while performing a waterstop splice;
FIG. 4 is an electrical wiring circuit diagram for the portable radiant heater in accordance with the present invention;
and FIG. 5 illustrates a waterstop splice formed with the portable radiant heater in accordance with the present invention.
D-tailed DeJcriDtion of th- Preferred Embodiment A conventional prior art splicing iron 10 which is typically used for performing splices in waterstops is shown in FIG. 1.
The conventional splicing iron 10 comprises an insulated handle 16 connected to a generally rectangular-shaped heat-conductive metal casing which encloses and is in thermal contact with electrical resistance heating elements (not shown). The metal casing of the splicing iron 10 presents first 12 and second 14 heated contact surfaces on opposite sides thereof. In addition, conventional splicing irons generally require the addition of a Teflon~ fabric cover that is placed over the casing to prevent melted portions of the waterstops from sticking to the heated contact surfaces 12 and 14.
In accordance with the conventional splicing technique, the splicing iron 10 i8 positioned between the opposing ends of two waterstop sections 18 and 20. The edge surfaces 22 and 24 of the two waterstop sections 18 and 20, respectively, are then brought into contact with the heated contact surfaces 12 and 14 of the splicing iron 10, and held against the splicing iron until the _5_ 21~7~
: ' ends 22 and 24 of the waterstop sections 18 and 20 begin to melt.
Thereafter, the splicing iron 10 is removed and the melted edges 22 and 24 are pressed together and allowed to cool to thereby complete the formation of a water-tight splice. While the conventional splicing iron lo has been found to be adequate, it does suffer from the numerous drawbacks discussed above.
Turning now to FIG. 2, a portable radiant heater 30 in accordance with the present invention is shown. The radiant heater 30 includes a first heating element 32 and a second heating element 34. The first and second heating elements 32 and 34 preferably comprise quartz heating bulbs which have a straight tube-shaped configuration. The quartz heating elements 32 and 34 employed in the preferred embodiment are manufactured by Tempco Electric Heater Corporation, and are rated to provide 900 watts of power from a conventional 120-volt AC power source. The quartz heating elements are capable of attaining temperatures in cess of 2,000~ F. within approximately 90 seconds.
Consequently, the present heater 30 is able to reach its operating temperature much more quickly than prior art heating irons which rely upon conventional electrical resistance heating elements.
The quartz heating elements 32 and 34 are horizontally disposed and arranged so that the second heating element 34 is located directly above and parallel to the first heating element 32 and separated therefrom by first and second stop blocks 40 and 42 located at opposite ends of the heating elements. The heating elements 32 and 34 are mounted in a rectangular-shaped frame comprised of end support members 36 and 38 which are , ,, ' , ~.', ' .
, 2~ 0~7~
interconnected by top and bottom frame members 46 and 44. The end support members 36 and 38 have mounted thereon plug-in female receptacles (not shown) for mechanically receiving and making electrical connection to the male terminals on the ends of the heating elements 32 and 34. End covers 72 and 74 are provided for enclosing the receptacles and the associated electrical circuitry described below. A pair of support feet 80 and 82 is included to provide stability.
A handle assembly provides convenient means for transporting the heater 30 and comprises a wooden handle 70 that is mounted to the heater 30 via a pair of brackets 64 and 66 that are bolted to a handle support member 62 that is in turn fastened to the top frame member 46.
The heater 30 preferably includes a pair of heat-reflecting shields 48 and 54 to concentrate and direct the radiated heat laterally outward from the sides of the heater. In particular, a first longitudinal, arcuate-shaped heat shield 48 is positioned directly beneath the lower heating element 32 and is mounted to the bottom frame member 44 via a pair of spacers 50 and 52. A
similarly configured second heat shield 54 is positioned directly above the upper heating element 34 and is mounted to the top frame member 46 via a pair of spacers 56 and 58. As depicted in FIG. 3, the heat shields 48 and 54 reduce the amount of heat that radiates downward and upward from the lower 32 and upper 34 heating elements, respectively.
An ON/OFF switch 76 i~ mounted to end cover 74 and controls the application of power to the radiant heater 30. The switch 76 preferably has a built-in neon pilot light which is 21~47~5 illuminated when the radiant heater 30 is energized. An electrical power cord 78 emanates from the opposite end cover 72 that is adapted to be plugged into a conventional 115-volt AC
outlet. The electrical wiring diagram for the present radiant heater 30 is shown in FIG. 4. As shown in the diagram, power is supplied to the heating elements 32 and 34 through switch contacts 94 of ON/OFF switch 76. The heating elements 32 and 34 are connected in parallel with each other so that the remaining heating element will continue to function in the event that one of the elements burns out.
With particular reference to FIGS. 3 and 5, the preferred method of forming a splice between two waterstop sections using the radiant heater 30 according to the present invention will now be described. The heater elements 32 and 34 generate radiant heat, a substantial portion of which radiates outwardly from the sides of the radiant heater 30 to provide a first heated region 84 on one side and a second heated region 86 on the opposite side. The first and second heated regions 84 and 86 provide radiating heat that is sufficient to melt the resilient waterstop material.
In operation, the radiant heater 30 is positioned between the ends of two adjacent sections of waterstop 18 and 20. The end of the first waterstop 18 is preferably placed on top of a first block 88 so as to properly position the edge 22 of the waterstop 18 within the first heated region 84. Likewise, the end of the second waterstop section 20 is placed on top of a second block 90 so as to properly position the edge 24 of the second waterstop 20 within the second heated region 86.
21~7.~ ~
The opposing edge portions 22 and 24 of the two waterstop sections 18 and 20 are simultaneously heated until the edge portions 22 and 24 soften and begin to melt. This transition in the state of the edge portions 22 and 24 can generally be accurately detected by the glossy appearance the resilient waterstop material assumes as it beqins to melt. When the edge portions 22 and 24 have been adequately melted, the waterstop sections 18 and 20 are removed from the heater and pressed together as shown in FIG. 5, causing the formation of a bead of material 92 along the seam between the two sections. The sections 18 and 20 are then held together in the position shown in FIG. 5 for an amount of time, typically 5 - 10 seconds, adequate to allow the bead of liquified material 92 to cool and harden, thereby forming a water-tight seam.
Significantly, it will be appreciated that, due to the substantial amount of radiant heat produced by the present heater 30, it is unnecessary for the waterstop sections 18 and 20 to actually contact the heater in order to properly melt the edges 22 and 24. Moreover, by virtue of the radiant nature of the heating process, the end portions of the waterstop sections 18 and 20 adjacent to the edges 22 and 24 which are exposed to the heated regions 84 and 86 also absorb a substantial amount of heat energy. Concequently, when the waterstop sections 18 and 20 are removed from the heater 30, the edges 22 and 24 do not cool as quickly, thereby providing the operator with more time to carefully align the two waterstop sections 18 and 20 when joining them together as shown in FIG. 5. With conventional heating irons, on the other hand, the heating of the ends of the 2lo~
waterstop sections 18 and 20 is much more localized along the facing edges 22 and 24 of the waterstops. Therefore, the edges 22 and 24 are prone to cool and harden much more rapidly after being removed from the heating iron, particularly in cold weather conditions, thus providing the operator with very little time to properly position the waterstop sections and complete the splicing operation. Consequently, there is the tendency for operators under such circumstances to leave the waterstop sections 18 and 20 in contact with the heating iron longer in an attempt to more thoroughly melt the edge portions. This practice, however, greatly increases the likelihood of burning the edges 22 and 24 of the waterstops which introduces contaminants into the seam 92 and thereby increases the likelihood of a faulty seam. As a result, operators are much less apt to burn the edges 22 and 24 of the waterstop sections 18 and 20 using the radiant heater 30 of the present invention.
In accordance with a preferred embodiment of the present invention, the quartz radiant heating elements 32 and 34 are approximately 18 inches long and one-half inch in diameter.
Consequently, the heating elements 32 and 34 provide an effective heating length of approximately 16-1/2 inches which is sufficient to perform splices in waterstops up to 12 inches in width.
However, the present invention may employ radiant heating elements of greater heating length to handle wider strips of waterstops, if necessAry, without departing from the scope of this invention. In addition, while the preferred embodiment of the invention has been described as comprising a pair of quartz 21~7~5 radiant heating elements 32 and 34, other configurations may be provided without departing from the scope of the invention.
While the above description constitutes the preferred embodiment of the invention, it will be appreciated that the invention is susceptible to modification, variation, and change without departing from the proper scope or fair meaning of the accompanying claims.
Claims (11)
1. A portable heating device for performing butt-type splicing operations to join the ends of first and second sections of waterstops comprising:
a frame comprising top and bottom members interconnecting first and second end members and defining open regions along opposite sides of said frame;
an elongated radiant tubular heating element mounted intermediate said first and second end members and spaced from said top and bottom members;
first and second heat deflecting means mounted to said frame between said heating element and said top and bottom frame members and positioned above and below and proximate to said heating element for directing heat generated by said heating element outwardly through said open regions in the sides of said frame to thereby create first and second external heating zones adjacent to said open regions in the sides of said frame; and electrical circuit means connected to said heating element for controlling the application of electrical power to said heating element;
whereby the first and second waterstop and sections are positionable respectively in said first and second external heating zones and exposed to sufficient heat to initiate melting of the ends thereof and enable the end sections to be removed from said heating zones and joined together to form the splice.
a frame comprising top and bottom members interconnecting first and second end members and defining open regions along opposite sides of said frame;
an elongated radiant tubular heating element mounted intermediate said first and second end members and spaced from said top and bottom members;
first and second heat deflecting means mounted to said frame between said heating element and said top and bottom frame members and positioned above and below and proximate to said heating element for directing heat generated by said heating element outwardly through said open regions in the sides of said frame to thereby create first and second external heating zones adjacent to said open regions in the sides of said frame; and electrical circuit means connected to said heating element for controlling the application of electrical power to said heating element;
whereby the first and second waterstop and sections are positionable respectively in said first and second external heating zones and exposed to sufficient heat to initiate melting of the ends thereof and enable the end sections to be removed from said heating zones and joined together to form the splice.
2. The portable heating device of claim 1 wherein said tubular heating element comprises a pair of tubular quartz heating tubes mounted parallel to one another with a first tube positioned above the second tube.
3. The portable heating device of claim 2 wherein said first heat deflecting means is positioned above and proximate to said first quartz heating tube and said second heat deflecting means is positioned below and proximate to said second quartz heating tube.
4. The portable heating device of claim 2 wherein said first and second quartz heating tubes are connected to said electrical circuit means in parallel to each other.
5. The portable heating device of claim 1 further including a handle made of a low heat conductive material that is mounted to said top frame member.
6. The portable heating device of claim 3 wherein said first heat deflecting means comprises a first elongated, arcuate-shaped heat-deflecting shield mounted to said frame so as to be positioned above and proximate to said first quartz heating tube and said second heat deflecting means comprises a second elongated, arcuate-shaped heat-deflecting shield mounted to said frame so as to be positioned below and proximate to said second quartz heating tube.
7. The portable heating device of claim 1 wherein the length of said elongated radiant tubular heating element is greater than the width of the waterstop sections.
8. A method of performing a butt-type splice to join the edges of first and second end sections of waterstops, comprising:
providing a portable radiant heating device having a frame defining open regions on either side thereof, an elongated quartz heating element mounted in the frame and having a length greater than the width of said waterstop sections, and heat deflection means for directing heat generated by the heating element outwardly through said open regions to thereby create first and second external heating zones adjacent to said open regions on either side of said frame;
energizing the heating element in the heating device to radiate heat into said first and second external heating zones;
positioning said first and second waterstop end sections in said first and second external heating zones respectively such that said end sections are subjected to said radiated heat without contacting said heating device;
maintaining said end sections in said heating zones for a time period sufficient to soften said end sections and initiate melting of the edges thereof;
removing said end sections from said heating zones;
joining said end sections together so that the respective edges thereof fuse together and form a bead along the seam between said two sections; and holding said two end sections together until the end sections cool sufficiently to harden the bead formed along the seam.
providing a portable radiant heating device having a frame defining open regions on either side thereof, an elongated quartz heating element mounted in the frame and having a length greater than the width of said waterstop sections, and heat deflection means for directing heat generated by the heating element outwardly through said open regions to thereby create first and second external heating zones adjacent to said open regions on either side of said frame;
energizing the heating element in the heating device to radiate heat into said first and second external heating zones;
positioning said first and second waterstop end sections in said first and second external heating zones respectively such that said end sections are subjected to said radiated heat without contacting said heating device;
maintaining said end sections in said heating zones for a time period sufficient to soften said end sections and initiate melting of the edges thereof;
removing said end sections from said heating zones;
joining said end sections together so that the respective edges thereof fuse together and form a bead along the seam between said two sections; and holding said two end sections together until the end sections cool sufficiently to harden the bead formed along the seam.
9. The method of claim 8 wherein said quartz heating element is energized to operating temperatures in excess of 2000°F.
10. The method of claim 9 wherein said quartz heating element attains said operating temperatures within approximately 90 seconds after energization thereof.
11. The method of claim 8 wherein said heating device includes two parallel oriented quartz heating elements and said energizing step simultaneously energizes both heating elements.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US933,754 | 1992-08-24 | ||
| US07/933,754 US5329094A (en) | 1992-08-24 | 1992-08-24 | Portable radiant heater for performing splices in waterstop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2104715A1 CA2104715A1 (en) | 1994-02-25 |
| CA2104715C true CA2104715C (en) | 1998-08-25 |
Family
ID=25464451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002104715A Expired - Fee Related CA2104715C (en) | 1992-08-24 | 1993-08-24 | Portable radiant heater for performing splices in waterstops |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5329094A (en) |
| CA (1) | CA2104715C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5826503A (en) * | 1996-07-10 | 1998-10-27 | Harwil Corporation | Heat sealing apparatus for plastic bags |
| US6203639B1 (en) | 1998-02-17 | 2001-03-20 | Donnelly Corporation | Vehicle assembly line-side heat activation of a “ready-to-install” window fixing adhesive for attachment of a vehicle window to a vehicle |
| US6054001A (en) | 1998-02-17 | 2000-04-25 | Donnelly Corporation | Vehicle assembly line-side heat activation of a "ready-to-install" window fixing adhesive for attachment of a vehicle window to a vehicle |
| US6151790A (en) * | 1998-12-10 | 2000-11-28 | Whitfield; Jeffrey A. | Waterstop joining tool |
| US6533891B1 (en) * | 1999-02-03 | 2003-03-18 | The Goodyear Tire & Rubber Company | Butt splicing of elastomeric sheets |
| GB2362601B (en) * | 2000-05-24 | 2004-04-21 | Draftex Ind Ltd | Apparatus for joining profile sections |
| US6627024B2 (en) | 2002-01-07 | 2003-09-30 | Owens Corning Fiberglas Technology, Inc. | Method and apparatus for splicing fibrous mats |
| US6793120B2 (en) * | 2002-01-17 | 2004-09-21 | Donnelly Corporation | Apparatus and method for mounting an electrical connector to a glass sheet of a vehicle window |
| US7133606B1 (en) * | 2005-02-11 | 2006-11-07 | Elliott Daniel F | Pipe heating assembly with hingedly attached light emitters |
| US9027623B2 (en) * | 2009-09-22 | 2015-05-12 | Flexible Steel Lacing Company | Welding apparatus for conveyor belts and method |
| US8770253B2 (en) * | 2011-11-23 | 2014-07-08 | Flexible Steel Lacing Company | Cutting and splicing apparatus for conveyor belts and method |
| WO2014106114A1 (en) | 2012-12-28 | 2014-07-03 | Flexible Steel Lacing Company | Welding apparatus for conveyor belts and method |
| CN116476390A (en) | 2015-12-03 | 2023-07-25 | 弹性钢接头公司 | Tape splicing apparatus and method |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA697115A (en) * | 1964-11-03 | Metall-, Walz- Und Plattierwerke Hindrichs-Auffermann Aktiengesellschaft | Radiation heater | |
| BE514671A (en) * | ||||
| US2479425A (en) * | 1946-05-17 | 1949-08-16 | Steingruber George | Portable electric space heater |
| US2722590A (en) * | 1951-06-12 | 1955-11-01 | Gen Tire & Rubber Co | Tube joining apparatus |
| GB744562A (en) * | 1953-10-21 | 1956-02-08 | Harold Leopold Rink | Radiant and like space heaters |
| US3347729A (en) * | 1964-10-23 | 1967-10-17 | Phillips Petroleum Co | Apparatus for sealing thermoplastic materials including a radiant heater and a reflector |
| US3472721A (en) * | 1966-01-24 | 1969-10-14 | Research Inc | Apparatus for lap joinder of plastic sheets |
| DE2623598C2 (en) * | 1976-05-26 | 1983-05-19 | Focke & Pfuhl, 3090 Verden | Device for sealing, welding or gluing of foil wrappings of, for example, cigarette packs |
| JPS54149250A (en) * | 1978-05-12 | 1979-11-22 | Matsushita Electric Ind Co Ltd | Electric heater |
| US4244771A (en) * | 1978-12-05 | 1981-01-13 | Pierce Larry L | Thermoplastic sheet strip heater assembly |
| SU872284A1 (en) * | 1979-11-12 | 1981-10-15 | Тернопольский Ремонтно-Механический Завод | Apparatus for welding thermoplastic materials by infrared radiation |
| EP0200329A1 (en) * | 1985-03-20 | 1986-11-05 | Alethea Rosalind Melanie Hall | Method of joining sheets of a non-magnetic material together |
| DE3564191D1 (en) * | 1985-07-05 | 1988-09-15 | Npbi Bv | Sterile docking process and apparatus for plastic tube portions or the like |
| US5130551A (en) * | 1989-08-15 | 1992-07-14 | Ultraset Limited Partnership | Nail drying apparatus |
| US5241157A (en) * | 1990-04-27 | 1993-08-31 | Georg Fischer Ag | Arrangement for butt-welding plastic material components |
| DE4013471A1 (en) * | 1990-04-27 | 1991-10-31 | Fischer Ag Georg | Jig for butt welding plastic components |
-
1992
- 1992-08-24 US US07/933,754 patent/US5329094A/en not_active Expired - Lifetime
-
1993
- 1993-08-24 CA CA002104715A patent/CA2104715C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2104715A1 (en) | 1994-02-25 |
| US5329094A (en) | 1994-07-12 |
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