Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3315899 A
Publication typeGrant
Publication dateApr 25, 1967
Filing dateJan 8, 1965
Priority dateJan 8, 1965
Publication numberUS 3315899 A, US 3315899A, US-A-3315899, US3315899 A, US3315899A
InventorsVernon K Quarve
Original AssigneeEastman Kodak Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hot melt nozzle with reciprocating piston drip-prevention means
US 3315899 A
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent 3,315,899 HOT MELT NOZZLE WITH RECIPROCATING PISTON DRIP-PREVENTION MEANS Vernon K. Quarve, Brooklyn Center, Minn., assignor, by

mesne assignments, to Eastman Kodak Company, Rochester, N.Y., a corporation of New Jersey Filed Jan. 8, 1965, Ser. No. 424,271 10 Claims. (Cl. 239-586) This invention relates to a method means for metering a viscous liquid, such as the adhesive known as hot melt, with a sharp accurate cut off at the end of the metering period. The present invention is disclosed illustratively as a nozzle for depositing hot melt in which a moving element such as a sliding piston within the nozzle both shuts off the flow of material from a material source through the nozzle and also partially vacates a cavity in the nozzle. This partial vacating of a nozzle cavity creates a low pressure area into which liquid at the nozzle mouth is forced by the surrounding atmosphere to provide the sudden cut off of metered liquid referred to above. This nozzle action is highly desirable in many applications of viscous liquids and will be described particularly in use with a class of viscous adhesives known as hot melts.

It is desirable, when working with adhesives such as hot melts, to deposit a controlled bead of the material on a surface and cut off the bead with a sharp accurate end. Hot melt depositing devices, when moved away from the surface, the flow stopped and the nozzle will generally .trail a string of the adhesive, resulting in a bead protracted beyond the desired limits.

Thus, it is an object of the present invention to provide a means which will deposit a. head of hot melt with a sharp and accurate cut off.

It is a further object of this invention to provide a nozzle which will deposit a head of hot viscous liquid adhesive within sharply defined limits.

It is a still further object of the present invention to provide a nozzle for depositing a bead of viscous liquid adhesive upon a surface wherein a flow of liquid adhesive under pressure is fed through the nozzle while depositing on the surface, and means for selectively cutting off the flow of said liquid while simultaneously reducing the pressure in said nozzle is provided.

It is a yet further object of the invention to provide a method of depositing a bead of hot melt within certain sharply defined limits comprising providing a flow of liquid under pressure to a nozzle, and then at the desired point, stopping the flow of liquid to the nozzle, while simultaneously reducing the pressure within the nozzle.

It is still a further object of this invention to provide means for depositing a head of viscous liquid adhesive on a surface with an accurate, abrupt cut off comprising: a body including an adhesive inlet; a nozzle secured to said body; a piston operating in said body above said nozzle which communicates said inlet with said nozzle when said piston is in its lowermost position and interrupts said communication when said piston is at an intermediate point between the bottom and the top of the stroke thereof; and means for selectively reciprocating said piston.

Other objects of the invention will become apparent as the description proceeds.

To the accomplishment of the foregoing and related ends, this invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the employed.

principles of the invention may be 'the bore 39 with the annular The invention is illustrated by the accompanying drawings in which the same numerals refer to corresponding parts and in which:

FIGURE 1 is a sectional elevation of the nozzle with the piston in the bottommost position;

FIGURE 2 is a sectional elevation depicting the piston in the uppermost position drawn to the same scale as FIGURE 1.

The body 10 is provided with a bore 11 which is adapted to receive a connection from a source of a liquid plastic adhesive, known as hot melt, under pressure. Such an adaptation is represented by the threads 12. A second bore 13 parallel to the bore 11 is provided in the body 10. The bore 13 has, at its blind extremity, a continuation bore 14. Bore 13 is sealed at its outside opening by any suitable means as for example, by the plug 16 which may be threaded into the threads 17. A third bore 18 is provided in the body 10 intersecting and communicating the bores 11 and 13. Still another bore 19 is provided in the body 10, as shown parallel to the bore 18, in communication with the bore continuation 14. The bore 19 is provided, at

' its upper end as depicted in FIGURE 1, with a counter bore 21. The counter bore 21 is preferably of a substantially larger diameter than that of the bore 19. A blind bore 22 extends downwardly from the face .23 of the counter bore 21. The hole 24 communicates the blind bore 22 with the exterior of the body 10 Means for selectively admitting compressed gas are adapted to be in communication with the hole 24.

Plug 26 is adapted to be threadably inserted into the bore 18 as at 27 to seal this bore from the outside. The plug 26 is provided with a hollow end 28 and a blind bore 29 extending upwardly, longitudinal thereto. Transverse holes 31 are provided in the plug 26. It is desirable to provide at least 2 perpendicular transverse holes 31, communicating the blind bore 29 with the exterior of the plug 26 to provide adequate flow.

end, the hollow plug 28 and, at the lower end, the bottom of the bore 18.

A piston unit 33 is adapted to reciprocate within the bore 19. The piston unit 33 is constructed with a lower portion or first piston 34 adapted to reciprocate within the bore 19 and an upper portion or second piston 36 which is adapted to engage the counter bore 21. A seal is to be provided between the counter bore 21 and the upper piston portion 36. One suitable sealing means is the O-ring 37 which is seated in the annular groove 38 provided in the upper piston portion 36.. A top opening longitudinal blind bore 39 is provided in the piston 33.

The top of the blind bore 39 is to be sealed as for example by means-of the threaded cured into the blind bore 39.

An annular groove 42 is provided in the bore 19 at the position of the bore continuation 14. A second anular groove 43 is provided near the top of the bore 19 to releaseleakage through the hole 49 communicating with the outside. Piston 34 is provided with an annular groove 44 and transverse ports 47 which communicate groove 44 and, thus, with the exterior surface of the piston 34. Transverse ports 48 communicate the longitudinal blind bore 39 with the annular groove 46, provided on the periphery of said plug 41 which is sepiston 34, and, thus, with the exterior surface of the 3 ting compressed gas is suitably represented by the threaded hole 51 in the plug 50.

A nozzle or dispensing member 53 is rigidly secured to the body and includes a chamber 54 of a larger diameter than the bore 19 disposed to be in line with the bore 19. A nozzle outlet 55 communicates the chamber 54 with the exterior of the nozzle 53.

Operation It is to be noted, in FIGURE 1, that the bore 11 is in communication with a source of hot melt under pressure. The hot melt passes through the holes 31 into the bore 29. The bore 18 will, thus, be filled with the hot melt which is then strained through the screen 32 to remove particles therein that will not flow through the nozzle. The hot melt passes, then, through the bore 13 and the bore continuation 14 filling the annular groove 42. When the piston unit 33 is in the bottommost position, the annular groove 44 is in communication with the annular groove 42 and receives therefrom the hot melt under pressure. The hot melt fed to the annular groove 44 passes through the transverse ports 47 and thus into the bore 3-9, and out the ports 48. Hot melt flows from the ports 48 filling the annular groove 46 and that chamber 54, causing hot melt to be extruded through the nozzle outlet 55.

When it is desired to shut off the nozzle, the compressed gas is introduced to the counter bore 21 via bore 22 and hole 24 lifting the piston unit 33 to the position depicted in FIGURE 2. It is noted that the bottom rim 56 engages the bottom of the bore 19 sealing said bore before said piston unit 33 has reached the uppermost position. The hot melt under pressure is thus out of conmmunication with the chamber 54. As the piston unit 33 is further raised there is a decrease of pressure within said chamber. The decrease in pressure within the chamber 54 will tend to pull the hot melt at the nozzle outlet 55 back into the chamber 54 thus resulting in a sharply defined cut off. When the piston unit 33 reaches the position depicted in FIGURE 2, the annular groove 46 is out of communication with the chamber 54, and the annular groove 44 is out of communication with the bore extension 14.

It is apparent that many modifications and variations of this invention as hereinbefore set forth may be made without departing from the spirit and scope thereof. The specific embodiments described are given by way of example only and the invention is limited only by the terms of the appended claims.

I claim:

1. A nozzle for depositing hot melt comprising: a body including an inlet therein for receiving hot melt under pressure and a bore in communication with said inlet; a means for removing impurities from said hot melt interposed between said inlet and said bore; a piston having an exterior surface adapted to slide Within said bore, a 1ongitudinal passage closed at both ends thereof, and two transverse passages, an upper and a lower each communicating said longitudinal passage with the exterior surface of said piston; a dispensing member secured to said body below said bore and including a chamber of a greater diameter than said bore; driving means secured to said piston for selectively reciprocating said piston so that said piston in its bottommost position is disposed with said upper transverse piston passage of said piston in communication with said hot melt inlet and said lower transverse piston passage in communication with said chamber of said dispensing members and said transverse piston passages being out of communication with said inlet and chamber when said piston is at its uppermost position.

2. The nozzle of claim 1 wherein an annular groove is provided in said piston at the position of each transverse piston passage and there is provided a plurality of transverse piston passages at each position of said transverse piston passage.

3. The nozzle of claim 1 wherein the driving means comprises a second piston secured to said piston and said second piston is adapted to slide within a counter bore provided within said body; a source of compressed gas; means for selectively communicating opposite ends of said counter bore with said source of compressed gas so as to allow said compressed gas to selectively impinge on said second piston.

4. A nozzle for depositing hot melt comprising: a body including an inlet for receiving a viscous liquid under pressure, said body having a bore in communication with said inlet, piston means having an exterior surface adapted to slide within said bore, said piston including a longitudinal passage closed at both ends thereof, and a first transverse passage means and a second transverse passage means each communicating said longitudinal passage with the exterior surface of the piston means, a dispensing member secured to said body in alignment with one end of said bore, said dispensing member having a chamber of a greater diameter than said bore, driving means secured to said piston for selectively reciprocating said piston in said bore to a first position and a second position, said piston being in the first position when said first transverse passage is in communication with said inlet and said second transverse passage is in communication with said chamber whereby the viscous liquid under pressure flows through said piston and dispensing member to a discharge location, and said piston being in the second position when the first and second passage means are out of communication with said inlet and said chamber respectively.

5. The nozzle of claim 4 including a means for removing impurities from said viscous liquid interposed be tween said inlet and said bore.

6. The nozzle of claim 4 wherein annular grooves are provided in said piston at the positions of the first and second transverse passages.

7. The nozzle of claim 4 wherein the body has an enlarged counter bore in axial alignment with the bore and said driving means comprises a second piston secured to the piston in the bore, said second piston slidably disposed in said counter bore and secured to said piston, and means for selectively communicating opposite ends of said counter bore with a source of gas under pressure so as to allow said gas to selectively impinge on opposite sides of said second piston.

8. The nozzle of claim 4 wherein said body has an annular groove surrounding said bore in communication with said inlet.

9. The nozzle of claim 8 wherein an annular groove is provided in said piston at the position of the first transverse passage, said annular groove in the piston being in communication with the annular groove in the body when the piston is in the first position.

10. The nozzle of claim 9 wherein an annular groove is provided in said piston at the position at the second transverse passage, said second annular groove being in communication with said chamber when the piston is in the first position.

References Cited by the Examiner UNITED STATES PATENTS 1,136,740 4/1915 Tyson 141-117 2,077,938 4/1937 Kuttner 239-119 X 2,192,884 3/1940 Frank 239-533 2,686,562 8/1954 MacCracken et al. 239-119 2,721,008 10/1955 Morgan 222-571 X 3,118,611 1/1964 Berlyn 239-533 3,174,689 3/1965 McIntyre 239-583 X M. HENSON WOOD, JR, Primary Examiner.

VAN C. WILKS, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1136740 *Apr 17, 1913Apr 20, 1915Frank TysonValve for bottle-filling machines.
US2077938 *Jul 5, 1935Apr 20, 1937Int Harvester CoInjection valve for engines
US2192884 *Jul 3, 1937Mar 12, 1940Horace J FrankAutomatic fuel injection valve
US2686562 *Jan 20, 1950Aug 17, 1954Jet Heet IncLiquid fuel burner system with spray nozzle evacuator
US2721008 *Feb 2, 1953Oct 18, 1955Bartelt Engineering CoDispensing device
US3118611 *Feb 4, 1963Jan 21, 1964Berlyn Martin JFuel injection nozzle
US3174689 *Dec 6, 1962Mar 23, 1965Mcintyre Donald BFluid-distribution mechanism
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3348520 *Sep 16, 1965Oct 24, 1967Lockwood TechApplicator system for hot melt adhesive and the like
US3607340 *Apr 6, 1970Sep 21, 1971Eastman Kodak CoApparatus and method for spot-coating sheet and web materials
US3661679 *Sep 8, 1970May 9, 1972Lockwood TechAdhesive applicator for plywood patching machine
US3902665 *Jun 10, 1974Sep 2, 1975Ex Cell O CorpNozzle shut-off valve
US4394945 *Aug 6, 1981Jul 26, 1983Loctite CorporationValve having suck-back feature
US4637788 *Oct 5, 1983Jan 20, 1987Cadbury LimitedApparatus for making a confection including a depositing means and conveyor carried molds
US4651906 *Nov 1, 1985Mar 24, 1987Bima Maschinenfabrik GmbhArrangement for applying adhesive medium, particularly for leather and shoe articles
US4989792 *Jan 27, 1989Feb 5, 1991Nordson CorporationValve arrangement for intermittent application of a fluid adhesive to a substrate
US5078168 *Jul 18, 1990Jan 7, 1992Nordson CorporationApparatus for electrostatically isolating conductive coating materials
US5197676 *Sep 27, 1991Mar 30, 1993Nordson CorporationApparatus for dispensing conductive coating materials
US5205488 *Mar 22, 1991Apr 27, 1993Lonza Ltd.Process and device for spraying a liquid intermittently, especially a lubricant suspension to be sprayed under high pressure
US5221194 *Nov 26, 1990Jun 22, 1993Nordson CorporationApparatus for electrostatically isolating and pumping conductive coating materials
US5271569 *Oct 9, 1992Dec 21, 1993Nordson CorporationApparatus for dispensing conductive coating materials
US5326031 *Oct 15, 1992Jul 5, 1994Nordson CorporationApparatus for dispensing conductive coating materials including color changing capability
US5340289 *Mar 22, 1993Aug 23, 1994Nordson CorporationApparatus for electrostatically isolating and pumping conductive coating materials
US5341990 *Jun 11, 1993Aug 30, 1994Nordson CorporationApparatus and method for dispensing electrically conductive coating material including a pneumatic/mechanical control
US5372283 *Nov 8, 1993Dec 13, 1994Nordson CorporationTwo-component dispensing system
US5392989 *May 24, 1994Feb 28, 1995Semiconductor Systems, Inc.Nozzle assembly for dispensing liquid
US5402826 *Mar 7, 1994Apr 4, 1995Nordson CorporationCoupling device
US5447254 *Nov 16, 1993Sep 5, 1995Nordson CorporationFluid dispenser with shut-off drip protection
US5538186 *Jun 6, 1994Jul 23, 1996Nordson CorporationApparatus and method for dispensing electrically conductive coating material including a pneumatic/mechanical control
US5549755 *Dec 8, 1994Aug 27, 1996Nordson CorporationApparatus for supplying conductive coating materials including transfer units having a combined shuttle and pumping device
US5655896 *Oct 23, 1995Aug 12, 1997Nordson CorporationApparatus for dispensing conductive coating materials having multiple flow paths
US5707013 *Dec 6, 1996Jan 13, 1998Nordson CorporationApparatus and method for dispensing electrically conductive coating material including a pneumatic/mechanical control
US5733597 *Apr 3, 1995Mar 31, 1998Nordson CorporationSnuff back controlled coating dispensing apparatus and methods
US5759277 *May 17, 1996Jun 2, 1998Nordson CorporationManual and automatic apparatus for supplying conductive coating materials including transfer units having a combined shuttle and pumping device
US5947392 *Sep 12, 1997Sep 7, 1999Noroson CorporationTwo-component metering and mixing system for electrically conductive coating material
US6348171 *May 11, 1999Feb 19, 2002Mold Masters LimitedDrool control apparatus and method
US7125242Aug 11, 2003Oct 24, 2006Mold-Masters LimitedDecompression device for an injection molding apparatus
US7303720Jun 20, 2005Dec 4, 2007Mold-Masters LimitedMelt transfer device for a stack molding apparatus
US7416402Mar 31, 2004Aug 26, 2008Mold-Masters (2007) LimitedSprue bushing anti-drool device
US7771556 *Jun 23, 2006Aug 10, 2010Nordson CorporationApparatus and process to apply adhesive during labeling operations
USRE35883 *Jul 3, 1996Sep 1, 1998Nordson CorporationApparatus for dispensing conductive coating materials including color changing capability
Classifications
U.S. Classification239/586, 239/583, 239/575, 239/119
International ClassificationB05C5/02
Cooperative ClassificationB05C5/0229
European ClassificationB05C5/02C2
Legal Events
DateCodeEventDescription
Dec 27, 1983ASAssignment
Owner name: VALCO CINCINNATI, INC., 411 CIRCLE FREEWAY DRIVE,
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:POSSIS CORPORATION;REEL/FRAME:004206/0552
Effective date: 19831118