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Publication numberUS3851801 A
Publication typeGrant
Publication dateDec 3, 1974
Filing dateFeb 11, 1972
Priority dateFeb 15, 1971
Also published asDE2205740A1
Publication numberUS 3851801 A, US 3851801A, US-A-3851801, US3851801 A, US3851801A
InventorsRoth O
Original AssigneeInvolvo Ag Verpackungsmaschine
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dispensing device having lost motion piston pump
US 3851801 A
Abstract
A piston rod extends longitudinally through a chamber of a cylinder which is provided in one end wall with a dispensing nozzle. A piston surrounds and is slidable along the piston rod between a forward position expelling matter through the nozzle, and a retracted position. One or more passages are provided in the piston and/or the piston rod and these passages connect opposite axial ends of the piston but are open only when the piston is in the forward position. A supply of material to be dispensed communicates with the chamber rearwardly of the piston.
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Description  (OCR text may contain errors)

1 Dec. 3, 1974 DISPENSING DEVICE HAVING LOST MOTION PISTON PUMP [75] Inventor: Oskar Roth, Zurich, Switzerland [73] Assignee: Involvo AG, Verpackungsmachinen,

Bunzen, Switzerland [22] Filed: Feb. I1, 1972 [21] Appl. N0.: 225,421

[30] Foreign Application Priority Data Feb. 15, 1971 Switzerland 2178/71 [56] References Cited UNITED STATES PATENTS 5/1959 Wacher 425/246 X 11/1961 Wucher 3/1962 Marsh et al 222/380 X 3,091,233 5/1963 Dunlap 222/146 HE 3,221,937 12/1965 Kamborinn 222/334 X 3,398,435 8/1968 Noucl 425/245 X 3,531,023 9/1970 Mercer 222/146 HE 3,622,050 11/1971 Acton ct a1v 222/309 FOREIGN PATENTS OR APPLICATIONS 1,249,159 12/1960 Franco 425/245 Primary ExaminerRobert B. Reeves Assistant Examiner--David A. Scherbel Attorney, Agent, or Firm-Michael S. Striker 57 ABSTRACT A piston rod extends longitudinally through a chamber of a cylinder which is provided in one end wall with a dispensing nozzle. A piston surrounds and is slidable along the piston rod between a forward position expelling matter through the nozzle, and a retracted position. One or more passages are provided in the piston and/or the piston rod and these passages connect opposite axial ends of the piston but are open only when the piston is in the forward position. A supply of material to be dispensed communicates with the chamber rearwardly of the piston.

12 Claims, 3 Drawing Figures PATENTE-U 3'974 3.85L80l sum HP 2 Fig. i

DISPENSING DEVICE HAVING LOST MOTION PISTON PUMP BACKGROUND OF THE INVENTION The present invention relates generally to a dispensing device, and more particularly to a device for dispensing a bonding agent. Dispensing devices are already known and in use in the book-binding art and in similar applications, wherein an adhesive or a bonding agent is to be dispensed and applied to a point of use. In these devices the bonding agent is accommodated in a supply vessel which can be heated in order to heat the bonding agent itself. The bonding agent is supplied from the vessel via a similarly heatable connecting conduit under pressure to a spray or dispensing arrangement. The supply vessel itself is not part of a structural unit with the spraying arrangement. When a valve is actuated the bonding agent is expelled from the nozzle of the spraying arrangement.

These known constructions have certain disadvantages. One of these is the fact that it is not possible to precisely meter the quantity of bonding agent which is to be dispensed during each incident of use. Another is that it is not possible to produce during discharge a perfectly straight stream of bonding agent, so that the application of the bonding agent to specific point is often difficult. In addition the relatively significant distances between the supply vessel and the spraying arrangement itself require substantial expenditures for heating of the connection conduit and for thermally insulating the same, which of course is expensive.

SUMMARY OF THE INVENTION It is accordingly a general object of the present invention to provide a dispensing device of the type under discussion which is not possessed of the disadvantages of the prior art.

More particularly it is an object of the present invention to provide such an improved dispensing device in which the quantity of material dispensed during each incident of use can be precisely controlled.

An additional object of the invention is to provide such a dispensing device in which a straight spray or stream of material is dispensed during each incident of use, so that the stream can be directed without difficulty to a desired location, and wherein further the stream has a well defined beginning and end at the initiation and termination of the incident of use.

In pursuance of these objects, and of others which will become apparent hereafter, one feature of the invention resides, briefly stated, in a dispensing device, particularly for applying a bonding agent. This dispensing device comprises cylinder means having an elongated internal chamber provided with two end walls. Dispensing nozzle means is provided and communicates with the chamber at one of the walls. A piston rod extends longitudinally through the chamber and a piston surrounds and is slidable along the piston rod between an expelling position closer to and a retracted position farther from the one end wall. The piston divides the chamber into two compartments which are located at opposite axial sides of the piston. Passage means is open and connects the compartments when the piston is in its expelling position, and is closed when the piston is in its retracted position. Supply means forms a part of the dispensing device and communicates with the chamber intermediate the piston and the other of the end walls for supplying material to be dispensed.

With an arrangement according to the present invention the disadvantages of the prior art are overcome, as will become apparent.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a cross-section through one embodiment of the invention;

FIG. 2 is a fragmentary detail view is an enlargedscale section. illustrating the piston of FIG. 1 in its expelling position; and

FIG. 3 is a view similar to FIG. 2 but illustrating the piston in its retracted position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Discussing the drawing in detail, wherein I have illustrated in FIGS. 1-3 a single exemplary embodiment which is not, however, to be considered limiting. It will be seen that reference numeral 1 identifies a supply vessel intowhich material to be dispensed is introduced, for instance a glue orv other bonding agent. A cover 2 is provided to close the vessel I which has an opening 3 at its lower end through which a suitable heating element 4 extends into the interior of the vessel, leaving enough space so that material can flow around the heating element 4 and leave the vessel 1. The heating element 4 may be an electrical heating element whose operation and structural details are of no consequences for the purposes of the present invention, it being understood that these heating elements are known per se from the prior art.

The vessel 1 is mounted on and structurally connected with a thermallyconductive body 5 in which there is provided a path or conduit 6 for material which leaves the vessel 1 through the opening 3 thereof. A filter 7 may advantageously be interposed in the conduit 6, and a further heating element 8 (of the same type for instance of the heating element 4) with a thermostat 9 for controlling its operation, may also be located in the body 5 in order to transmit heat to material passing through the passage or conduit 6.

Also mounted and structurally connected with the body 5 is a cylinder 10 which is coaxially connected with a pneumatic cylinder 11. A piston 12 is slidably accommodated in the chamber of the cylinder 11, which latter has two openings 13 and 14 for the inlet and outlet of compressed air.

A pistonrod 16 is fast with the piston 12 and extends into the cylinder 10 in which there is located a piston 15 which surrounds and is slidable longitudinally of the piston rod 16 in the cylinder 10. A one-way valve 17 closes the lower end of the chamber in the piston 10, that is the outlet path for material to be dispensed by the dispensing nozzle 18 provided at this lower end.

The upper free end of the piston rod 16 faces the upper or rear end of the pneumatic cylinder 11, and an adjustable screw 19 is mounted at this upper or rear end extending axially towards this free end of the piston rod 16. Depending upon the extent to which the screw 19 is threaded into the interior of the cylinder 11, it will encounter the free end of the piston rod 16 sooner or later during axial displacement of the latter, that is it will limit the extent to which the piston rod can travel.

A conical portion 21 and a cylindrical portion 24 of the piston rod 16 are located in the chamber of the cylinder 10. On the cylindrical portion 24 the piston is mounted for axial sliding movement between an expelling position which is shown in FIG. 2 and a retracted or rest position which is shown in FIG. 3.

As the drawing shows, particularly clearly in FlGS. 2 and 3, the piston 15 is provided with an axial bore or passage 22 which conically opens in direction towards the conical portion or bead 21 of the piston rod 16. When the piston moves to the retracted position illustrated in FIG. 3, the conical portion 21 of the piston rod 16 enters into the conical part of the bore 22 and, inasmuch as connecting passages 25 (of which one or more may be provided) which connect the opposite axial ends of the piston 15 with one another, terminate in the conical part of the bore 22, these passages 25 are closed when the piston 15 is in the position shown in FIG. 3. In other words, when the piston is in the position shown in FIG. 2 the passages 25 establish a communication between the cylinder compartments and 23 which are located at the opposite axial sides of the piston 15, whereas when the piston is in the position of FIG. 3 this communication will be terminated.

The operation of the device disclosed herein will already be clear from what has been set forth thus far. The material to be dispensed, for instance liquid glue, flows via the opening 3 from the vessel 1, flows into the conduit 6. The glue has already been heated by the heating element 4, increasing its flowability. The thermostat 9 regulates a precise maintenance of the desired temperature and the filter 7, if provided, filters any particulate contaminants out of the glue so that they cannot clog the nozzle 18.

From the conduit 6 the glue flows into the compartment 20 which is located rearwardly or upwardly of the piston 15. It is assumed at this point that the piston 12 in the cylinder 11 is itself moved upwardly by admission of compressed air through the cylinder 11 through the opening 14, as shown in FIGS. 1 and 2. At this position the conical portion or bead 21 of the piston rod 16 is withdrawn from the conical part of the bore 22 in the piston 15 so that glue can flow through the bore 22 and the passages and enter into the compartment 23 intermediate the piston 15 and the nozzle 18. Admission of compressed air into the cylinder 11 at the opposite side of the piston 12, that is through the opening 13, causes the piston 12 and thereby the piston rod 16 to be displaced downwardly in FIG. 1. The piston rod slides initially into the piston 15 until the conical portion 21 becomes seated in the conical part of the bore 22 of the piston 15, as shown in FIG. 3, so that communication between the compartments at the opposite sides of the piston 15 is closed and it becomes impossible for further glue to flow into the compartment 23. Further forward or downward movement of the piston rod 16 then causes the piston 15 to move in the same direction, opening the one-way valve 17 and ejecting the glue through the nozzle 18. Subsequent retraction of the piston 15 results in the development of a vacuum in the compartment 23 between the piston 15 and the nozzle 18, so that additional glue can rapidly be aspirated into this compartment 23 once the passages 25 become opened which takes place as soon as the conical portion 21 of the piston rod 16 is withdrawn from the conical part of the bore 22.

The stroke of the piston 15, and thereby the quantity of glue or similar material which can be ejected. can be selected by appropriate positioning of the screw 19, it will be appreciated, of course. that the more rapid the succession of expelling incidents takes place, the more rapidly the next-following quantity of glue must be admitted into the compartment 23, and this is assured by the suction effect resulting from withdrawal of the piston 15 to its retracted position.

While it has been illustrated that the passages 25 are provided in the piston 15, it will be appreciated that other solutions can be found within the concept of the present invention. Thus, for instance, the piston rod 16 itself may be provided with an axial channel which is open in the compartment 23 and which at its upper end, that is when the piston 15 is in its lower position. terminates in the region of the conical portion 21 of the piston rod 16 so as to be opened and closed in the same manner in which the passages 25 in the piston 15 are opened and closed. These passages 25 in the piston 15 can then of course be omitted.

It will be understood that each of the elements de scribed above, or two or more together, may also find a useful application in other types of constructions differing from the type described above.

While the invention has been illustrated and described as embodied in a dispensing device, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims:

1. A dispensing device, particularly for applying a bonding agent, comprising cylinder means having an elongated internal chamber provided with two end walls; dispensing nozzle means having a nozzle passage communicating with said chamber at one of said end walls; a piston rod extending longitudinally through said chamber; a piston surrounding said piston rod and slidable part of the distance between a first and a sec ond position together with said piston rod and part of the distance relative to said piston rod. said piston dividing said chamber into two compartments located at opposite axial sides of the piston; passage means which is open and connects said compartments when said piston slides reiative to said piston rod in one direction until said piston is in said first position, and closed when said piston rod and piston slide relative to one another in an opposite direction until said piston is in said second position; supply means communicating with said chamber intermediate said piston and the other of said end walls for supplying material to be dispensed; and valve means interposed in said nozzle passage, including a valve body responsive to the pressure of material resulting from movement of said piston toward said second position for opening said nozzle passage, and a biasing spring urging said valve body to normally close said passage.

2. A dispensing device as defined in claim 1, said passage means being provided in at least one of said piston rod and piston.

3. A dispensing device as defined in claim 1, said passage means being provided in said piston.

4. A dispensing device as defined in claim 1, wherein said passage means is provided in at least one of said piston rod and piston and comprises at least one passage therein.

5. A dispensing device as defined in claim 1, said piston rod having a front portion closer to and an other portion farther from said one end wall, said other portion being provided with a conical bead; and wherein said piston has a central bore having a cylindrical first section surrounding said front portion and a conically diverging second section facing said bead, said passage means being provided in said piston and communicating with said second section, and said bead being seated in said second section when said piston is in said retracted position.

6. A dispensing device as defined in claim 5, wherein said passage means comprises a plurality of passages.

1 justing screw adapted to extend into said additional cylinder to a selectable extend and projecting axially towards said free end so as to contact the same in response to axial shifting of said portion and to sclectably limit the extent of such axial shifting.

9. A dispensing device as defined in claim I; further comprising path-defining means defining a flow path for material to be dispensed and connecting said supply means with said cylinder.

10. A dispensing device as defined in claim 9, wherein said path-defining means is at least in part of thermally conductive material and in thermally conducting contact with said supply means and with said cylinder.

11. A dispensing device as defined in claim 10; and further comprising heating means for heating said material in said dispensing device.

12. A dispensing device as defined in claim 9; further comprising filter means in said path-defining means for filtering of material passing therethrough.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2885734 *Jun 22, 1956May 12, 1959Wucher RolandApparatus for moulding plastic materials
US3007202 *Dec 18, 1959Nov 7, 1961Roland WucherApparatus for injection moulding of plastic materials
US3023936 *Jun 26, 1959Mar 6, 1962Marien Metal Products CoDispensing pump with venting means
US3091233 *Aug 3, 1960May 28, 1963Kamborian Jacob SAdhesive dispensing apparatus
US3221937 *Jun 3, 1963Dec 7, 1965Kamborian Jacob SCement extruding mechanism
US3398435 *Oct 22, 1965Aug 27, 1968Inv S Finance CorpMethod and apparatus for molding plastics
US3531023 *Apr 30, 1968Sep 29, 1970Mercer CorpProcess and apparatus for melting and dispensing thermoplastic material
US3622050 *Feb 13, 1969Nov 23, 1971Anchor Hocking CorpMetered compound applying nozzle
FR1249159A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3942686 *May 1, 1974Mar 9, 1976Involvo AgGlueing device
US4449650 *Nov 19, 1981May 22, 1984Censor Patent- Und Versuchs-AnstaltMetering pump especially for volatile materials
US4613062 *Apr 17, 1984Sep 23, 1986Continental Can Company, Inc.Hot melt material dispenser
US4632278 *Nov 27, 1985Dec 30, 1986Northern Teleco M LimitedDispensing cylinder with cylindrical heater
US4771726 *May 4, 1987Sep 20, 1988Fitch Jr Clifford EApparatus for dispensing flowable materials
US4793524 *Apr 30, 1981Dec 27, 1988American Monitor CorporationIntegrated reagent container and metered dispenser means
US5107907 *Aug 24, 1990Apr 28, 1992U.S.A., Inc. HemaTwo-stage product filling apparatus
US5320250 *Nov 19, 1992Jun 14, 1994Asymptotic Technologies, Inc.Method for rapid dispensing of minute quantities of viscous material
US5505777 *Feb 7, 1994Apr 9, 1996Asymptotic Technologies, Inc.Computer controlled viscous fluid dispensing system
US5927560 *Mar 31, 1997Jul 27, 1999Nordson CorporationDispensing pump for epoxy encapsulation of integrated circuits
US5992688 *Feb 22, 1999Nov 30, 1999Nordson CorporationDispensing method for epoxy encapsulation of integrated circuits
US6557734 *Feb 9, 2001May 6, 2003Q2100, Inc.Plastic lens systems, compositions, and methods
US6612828Feb 20, 2001Sep 2, 2003Q2100, Inc.Fill system with controller for monitoring use
US6655946Feb 20, 2001Dec 2, 2003Q2100, Inc.Apparatus for preparing an eyeglass lens having a controller for conveyor and curing units
US6676398Feb 20, 2001Jan 13, 2004Q2100, Inc.Apparatus for preparing an eyeglass lens having a prescription reader
US6676399Feb 20, 2001Jan 13, 2004Q2100, Inc.Apparatus for preparing an eyeglass lens having sensors for tracking mold assemblies
US6698708Mar 30, 2000Mar 2, 2004Q2100, Inc.Gasket and mold assembly for producing plastic lenses
US6702564Feb 20, 2001Mar 9, 2004Q2100, Inc.System for preparing an eyeglass lens using colored mold holders
US6709257Feb 20, 2001Mar 23, 2004Q2100, Inc.Eyeglass lens forming apparatus with sensor
US6712331Feb 20, 2001Mar 30, 2004Q2100, Inc.Holder for mold assemblies with indicia
US6712596Sep 14, 1999Mar 30, 2004Q2100, Inc.System for producing ultraviolet blocking lenses
US6716375Mar 30, 2000Apr 6, 2004Q2100, Inc.Apparatus and method for heating a polymerizable composition
US6723260Mar 30, 2000Apr 20, 2004Q2100, Inc.Method for marking a plastic eyeglass lens using a mold assembly holder
US6726463Feb 20, 2001Apr 27, 2004Q2100, Inc.Apparatus for preparing an eyeglass lens having a dual computer system controller
US6729866Feb 9, 2001May 4, 2004Q2100, Inc.Plastic lens systems
US6752613Feb 20, 2001Jun 22, 2004Q2100, Inc.Apparatus for preparing an eyeglass lens having a controller for initiation of lens curing
US6758663Feb 20, 2001Jul 6, 2004Q2100, Inc.System for preparing eyeglass lenses with a high volume curing unit
US6790022Feb 20, 2001Sep 14, 2004Q2100, Inc.Apparatus for preparing an eyeglass lens having a movable lamp mount
US6790024Feb 20, 2001Sep 14, 2004Q2100, Inc.Apparatus for preparing an eyeglass lens having multiple conveyor systems
US6840752Feb 20, 2001Jan 11, 2005Q2100, Inc.Apparatus for preparing multiple eyeglass lenses
US6875005Feb 20, 2001Apr 5, 2005Q1200, Inc.Apparatus for preparing an eyeglass lens having a gating device
US6893245Feb 20, 2001May 17, 2005Q2100, Inc.Apparatus for preparing an eyeglass lens having a computer system controller
US6899831Feb 20, 2001May 31, 2005Q2100, Inc.Method of preparing an eyeglass lens by delayed entry of mold assemblies into a curing apparatus
US6926510Jul 3, 2002Aug 9, 2005Q2100, Inc.Plastic lens systems and compositions
US6962669Feb 20, 2001Nov 8, 2005Q2100, Inc.Computerized controller for an eyeglass lens curing apparatus
US6964479Aug 15, 2002Nov 15, 2005Q1200, Inc.Plastic lens system, compositions, and methods
US7004740Feb 20, 2001Feb 28, 2006Q2100, Inc.Apparatus for preparing an eyeglass lens having a heating system
US7011773Feb 20, 2001Mar 14, 2006Q2100, Inc.Graphical interface to display mold assembly position in a lens forming apparatus
US7025910Feb 20, 2001Apr 11, 2006Q2100, IncMethod of entering prescription information
US7037449Feb 20, 2001May 2, 2006Q2100, Inc.Method for automatically shutting down a lens forming apparatus
US7044429Mar 15, 2002May 16, 2006Q2100, Inc.Methods and systems for coating eyeglass lens molds
US7045081Feb 20, 2001May 16, 2006Q2100, Inc.Method of monitoring components of a lens forming apparatus
US7051290Feb 20, 2001May 23, 2006Q2100, Inc.Useful for curing multiple eyeglass lenses in a continuous manner using activating light
US7052262Feb 20, 2001May 30, 2006Q2100, Inc.System for preparing eyeglasses lens with filling station
US7060208Feb 20, 2001Jun 13, 2006Q2100, Inc.Method of preparing an eyeglass lens with a controller
US7074352Feb 20, 2001Jul 11, 2006Q2100, Inc.Graphical interface for monitoring usage of components of a lens forming apparatus
US7079920Feb 9, 2001Jul 18, 2006Q2100, Inc.Plastic lens systems, compositions, and methods
US7083404Feb 20, 2001Aug 1, 2006Q2100, Inc.System for preparing an eyeglass lens using a mold holder
US7124995Feb 20, 2001Oct 24, 2006Q2100, Inc.Holder for mold assemblies and molds
US7139636Feb 20, 2001Nov 21, 2006Q2100, Inc.System for preparing eyeglass lenses with bar code reader
US7278550 *Nov 11, 2004Oct 9, 2007Nordson CorporationMethod and system for aligning components of a liquid dispensing system
US7296706 *Oct 29, 2004Nov 20, 2007Nordson CorporationMethod and system for supporting and/or aligning components of a liquid dispensing system
US7832593Nov 20, 2007Nov 16, 2010Nordson CorporationMethod and system for supporting and/or aligning components of a liquid dispensing system
US8132698Nov 15, 2010Mar 13, 2012Nordson CorporationMethod and system for supporting and/or aligning components of a liquid dispensing system
US8272537 *Apr 6, 2009Sep 25, 2012Nordson CorporationValveless liquid dispenser
USRE42029Nov 16, 2007Jan 18, 2011Nordson CorporationIntake portion of a liquid dispensing valve
EP0294197A2 *Jun 2, 1988Dec 7, 1988Loctite CorporationSealless dispensing mechanism
EP0869554A2 *Mar 3, 1998Oct 7, 1998Nordson CorporationDispensing pump for epoxy encapsulation of integrated circuits
Classifications
U.S. Classification222/146.5, 222/309, 222/380, 222/383.1
International ClassificationB05B9/01, B05B9/00
Cooperative ClassificationB05B9/01
European ClassificationB05B9/01