US 3782599 A
In a device for feeding glue by means of a hose from a glue container to a glue applying head, the glue in the glue container is provided with a cover layer comprising a fluid, such as a mineral oil, which is inert with relation to the glue, has a specific gravity which is less than that of the glue and repulses said glue, so that no air can touch the glue and form a glue skin thereon.
Claims available in
Description (OCR text may contain errors)
United States Patent Luginbiihl DEVICE FOR FEEDING GLUE FROM A GLUE CONTAINER TO A GLUE APPLYING HEAD Inventor: Pierre Luginbiihl, Nauhausen am Rheinfall, Switzerland Assignee: Schweizerische Industrie-Gesellschaft, Neuhausen am Rheinfall, Switzerland Filed: Jan. 19, 1972 Appl. No.: 219,042
Foreign Application Priority Data Feb. 10, 1971 Switzerland ...l982/71 US. Cl 222/51, 73/322, 118/10, 222/108 Int. Cl. B67d 5/22, GOlf 23/06 Field of Search 73/322, 150 R, 319, 73/306, 307; 118/200 R, 267, 241, 402, 403, 267, 7, 9, 10; 156/295, 547, 548, 540, 575, 578; 222/51, 64, 108, 395, 57
Jan. 1, 1974  References Cited UNlTED STATES PATENTS 2,599,604 6/1952 Bauer et a1. 156/295 X 2,557,668 6/1951 Lincoln 156/548 X 2,527,774 10/1950 Lathem et al 118/403 X 3,605,682 9/1971 Groce et al 118/9 3,523,456 8/1970 Matzen et al,.. 73/322 X 2,127,595 8/1938 Heden 118/402 Primary Examiner-Richard C. Queisser Assistant Examiner-Daniel M. Yasich Attorney-Benjamin H. Sherman et a1.
 ABSTRACT In a device for feeding glue by means of a hose from a glue container to a glue applying head, the glue in the glue container is provided with a cover layer comprising a fluid, such as a mineral oil, which is inert with relation to the glue, has a specific gravity which is less than that of the glue and repulses said glue, so that no air can touch the glue and form a glue skin thereon.
5 Claims, 3 Drawing Figures 1 DEVICE FOR FEEDING GLUE FROM A GLUE CONTAINER TO A GLUE APPLYING HEAD The invention relates to a device for feeding glue from a glue container to a glue applying head.
In the known devices of this type the glue is always in contact with the air so that owing to a drying effect of the air on the glue a skin of glue is formed on the same. Furthermore, when the level of the glue in the container drops, glue skins are formed on the walls of the container because some of the glue adheres to the walls of the container. When the container subsequently is refilled with glue the formed skins are partly torn and are removed from the walls and the skin portions enter the connecting line leading to the glue applying head so that the connecting line and also the head itself may become clogged. Therefore, one has to clean the device repeatedly and this results in an interruption of the operation of the glue applying head. Also, when one connects a new glue bottle by a dip pipe with the glue applying head and even if one employs compressed air for feeding the glue to the glue applying head, the formation of glue skin cannot be avoided. Furthermore, there always remains glue residue in the bottles.
It is an object of the invention to provide a device which avoids the above mentioned disadvantages by providing in the container above the surface of the glue therein a cover layer which separates the glue from the air. This cover layer comprises a fluid which is inert with relation to the glue and has a specific gravity which is less than that of the glue.
The drawing illustrates by way of example, an embodiment of the device of the invention.
IN THE DRAWING FIG. 1 illustrates a vertical sectional view of the glue supplying device;
FIG. 2 illustrates a portion of the device illustrated in FIG. 1 when the container is refilled with glue; and
FIG. 3 illustrates the cover of the glue container with an associated float when removed from the glue container and placed on a horizontal surface.
Referring to the drawing, a glue container 1 is connected by a hose with a glue applying head 2 to which the contents of the glue container 1 is fed, whereby the glue applying head 2 is arranged at a lower level than the glue container 1. The glue container 1 is supported by two supports 3 or the like, and has a funnel-shaped downwardly converging bottom 4 whose central discharge aperture is connected by the hose 5 with the glue applying head 2 arranged therebelow. The difference in height between the glue container and the glue applying head is such that the glue flows by its gravity toward the glue applying head 2. The container 1 is provided with a cover part 7 which by screws 8 or the like, is attached to the upper edge of the container wall 9. The cover part 7 is horizontal and is provided with a central aperture from which a vertical collar 11 extends upwardly. A cover 12 rests loosely on the upper edge of this collar 11. In the center of the cover 12 is arranged a vertical tubular guide 13 for a vertical rod 14 which extends through the cover 12. The lower end of the vertical rod 14 has attached thereto a float 15. This float 15 floats in a fluid which forms a cover layer 16 above the level 17 of the glue 6 in the container 1. In order to remain above the level 17 of the glue 6, the
fluid forming the: cover layer 16 has a lower specific gravity than the glue. The upper portion of the rod 14 is provided with three differently colored sections, for instance a lower relatively long green section 18, a center relatively short yellow section 19, and an upper still shorter red section 20. The portion of the rod 14 extending upwardly beyond the tubular guide 13 indicates when it becomes necessary to refill the container 1 with glue. As long as a portion of the lowermost section 18 is visible a refilling is not required; when the center section 19 partly disappears in the guide 13 a refilling is advisable, but when only the uppermost section 20 is visible, then it is necessary to refill the container 1 with glue. At the upper end of the rod 14 is arranged a button 21 which forms a stop which prevents that during the lowering of the float 15 the latter will touchthe bottom 4.
For refilling the container 1 with glue the cover is removed and a bottle of glue 22 is emptied into the container 1 in a manner as illustrated in FIG. 2. The glue which is being discharged from the bottle 22 flows simply through the cover layer 16. The capacity of the glue container 1 is so selected that it is the same as the capacity of the bottle 22 so that the bottle 22 may be completely emptied provided that prior to the removal of the cover 12 the lower section 18 of the rod was no longer visible. The bottle 20 is completely emptied and any loss of glue is avoided.
During the refilling of the container 1, the cover 12 with the rod 14 and the float 15 thereon is placed on a table 23 or other horizontal surface in the manner as is illustrated in FIG. 3. It is obvious that when this is done that any cover layer liquid which may adhere to the floatlS drops at 24 from the float 15 and at 24' into a catch pan formed by the frustocdnically shaped collar 25. When subsequently, after the refilling of the glue, the cover is again brought into its closed position as shown in FIG. 1, the collected cover layer fluid flows from the collar 25 back into the container 1.
The glue application head 2 which is tiltably supported on a fixed horizontal pin 26 is provided in conventional manner with a nozzle 27 which is provided at its discharge end with a spring-loaded ball 18.
A paper web 29 which at predetermined points or lines is to be provided with glue is pulled by a drawing member 30 from a supply .roll 31 and is moved over guide rollers 32 and33 and over a table 3d past the glue applying head 2 which in conventional manner is tilted upwardly and downwardly as indicated by a double arrow 35. When the ball 28 during the downward movement of the head 2 engages the paper web 29, it is moved relatively to the nozzle 27 upwardly and permits the discharge of some glue, until the head 2 is again tilted upwardly and is closed by the ball 28. A cutting device 36 severs the sections of the paper web 29 provided with glue from the paper web 29 which ob viously may consist of a material other than paper. Thereupon, the drawing member 30 engages the new end of the paper web 29 and moves the web forwardly again.
Compared with the heretofore employed conventional glue feed devices mentioned in the foregoing, the device of the present invention has substantial advantages. Since the glue is only in contact with the air when the glue bottle is emptied into thecontainer 1, it is impossible that at any place a glue skin can be formed by the drying effect of the air which would disturb the feeding of the glue toward the head 2 or would make a cleaning of the device necessary. Furthermore, as soon as the container is refilled, the operation of the glue applying head 2 may be continued.
The fluid forming the covering layer 16 comprises a special mineral oil which is neutral with relation to the glue and which firmly adheres to the wall of the container and also has a repulsive effect with respect to the glue. Such an oil has a specific gravity which is less than that of the glue and does not evaporate and does not oxidize.
It has been discovered that when the glue level 17 drops no glue remains on the wall of the container. On the other hand when the container is refilled with glue and the glue rises in the same, a thin film of oil remains between the wall of the container and the glue 6, so that not the slightest traces of glue come into contact with the air. Obviously, it is also possible to provide the container with a tightly closing cover and to introduce compressed air above the level of the oil in order to accelerate the flow of the glue. However, when the device is sensibly dimensioned a relatively small natural drop is sufficient to assure a steady flow of glue to the head 2; in fact as a rule the application of a gas under pres sure may be dispensed with.
1. In a device for dispensing liquid glue, a liquid glue supply container having a removable top cover and a bottom outlet; a liquid glue dispensing head; conduit means connecting said dispensing head with said bottom outlet of the container; the improvement comprising said container being partly filled with a predetermined amount of liquid which is inert to and immiscible with the glue, and which has a specific weight less than that of the liquid glue so that it forms a protective layer on the top surface of any liquid glue in the container, thereby continuously preventing contact between air and said liquid glue in the container; and float-rod means carried by said top cover with the float means in said protective layer of liquid provided with indicator rod means extending upwardly through an opening in said top cover of the container and provided on its projecting portion through the top cover with indicator means to show the depth location of said float means 4 within the container and thereby the surface level of the liquid glue supply in the container.
2. The device according to claim 1, in which said liquid forming said cover layer is a mineral oil which adheres more firmly to the container wall than does the glue.
3. The device according to claim 1, in which said removable top cover of the container is provided on its underside with a downwardly converging collar which when said top cover is in a closure position on the container the collar projects into the container, while when the top cover is removed from the container and placed on a substantially horizontal support surface with said float means within said collar and with the peripheral edge of the collar and the top end of said rod means in contact with said support surface, said collar together with the adjacent portion of said top cover forms a drip pan for any traces of liquid remaining on the float means.
4. A float and top cover assembly for a liquid container, comprising a removable cover member provided on its underside with a downwardly projecting annular collar; an indicator rod extending slidably through an opening in said cover member and having an annular stop member on its top end portion and a plurality of depth indicator markings beneath said stop member; and a float secured to the lower end of said indicator rod and being of less transverse dimension than said annular collar, the diameter of said cover member being greater than the diameter of the stop member, so that when said assembly is removed from the container and placed upon a substantially horizontal support surface and said float retracted to within the confines of said collar and with the outer edge of said cover member and the stop member on the top end of said indicator rod in contact with the support surface, said collar together with adjacent portions of the cover member forms a drip pan for any liquid remaining on said float.
5. The assembly according to claim 4, in which said annular collar is convergent downwardly from said cover member.