US1584838A - Paste dispensing - Google Patents

Description

May 18,1926. 1,584,838

. A. P. BRUSH PASTE DI SPENSING Filed August 27. 1925 I INIVENITOR ATTO NEY Patented May 18, 1926.

UNITED STATES ABBOTT P. BRUSH, OF GREENWICH, CONNECTICUT.

PASTE DISPENSING.

Application filed August 27, 1925. Serial No, 52,718.

The objects of this invention are to provide a simple, inexpensive and practical device for dispensing tooth paste or other material of a plastic or semi-fluid nature, which canbe easily operated to discharge any desired quantity of the paste and which will be self-sealing and self-cleaning in op eration so as to be and remain truly sanitary and hygienic.

These objects are attained in part by a discharge member in the nature of a rubber nipple having a continuous thin wall pierced while in a stretched condition so as to have an extreme self-sealing tendency rendering it normally both airtight and liquid-tight and this contracting passage in the thin wall having the eiiect of biting off the paste line directly the compression force for discharging the paste is removed.

Various other novel features of the invention will appear as the specification pro- Figure l is a perspective view of one form of the device applied to an ordinary collapsible paste tube.

Figure 2 is an enlarged part sectional view of the dispenser in a normal or relaxed condition filled with paste from the tube.

Figure 3 is a similar view illustrating the discharging action effected by squeezing pressure on the nipple.

Figure 4 is a like view illustrating the cutting-0E and self-clearing action effected in the return, upon removal of the discharging force.

Figure 5 is a corresponding view showing the discharge port in the nipple returned to the normally closed and sealed condition.

Figures 6 and 7' are detail views illustrating the piercing of the material while stretched to form a lesion which will open under' pressure but which will completely seal on removal of the stretching force.

The paste tube shown at 1 is of the usual collaps ble type having a screw threaded discharge neck 2.

The dispensing nipple is designated 3 and is shown as apphed to the discharge neck of the tube by-means of a screw collar 4 in the base of the nipple and directly engaged with the discharge neck, Figure 2. Thus associated with the tube the nipple forms both a cover for the tube and a holder for the paste discharged from the tube.

The nipple is made of highly elastic material such as live sheet rubber and as shown in the sectional views, has a thin wall of substantially the same thickness throughout the active portion of the same. Normally, this wall is of continuous and unbroken extent so as to absolutely seal the contents of both nipple and tube in an airtight, watertight condition. An incipient weakness is, however, provided in this normally continuous and unbroken wall which gives way under pressure of the contents but automatically heals as soon as pressure is removedor released.

This normally unbroken self-healing effect is obtained by piercing the elastic wall while it is in a stretched, attenuated condition, as shown in Figure 6, as by means of a suitable perforating instrument, 5 so as to leave the material when it relaxes or returns to a normal state with what amounts to practically only a line of weakness 6 and which strictly is not an opening, but defines a pomtat which the material will open when sufiicient stretching force is applied. AMCODdItIOH is thuscreated utilizing the'natural constrictive force inherent in the material toeifect both a closure and the exclusion from the passage of all past matter, as 1t closes.

' This self-cleaning e ect is due to the positive constrictive action, the thinness of the wall and to the manner in which the passage heals up, closing first at the inside, as indicated in Figure 4:, and with a wedgln action forcing the material outward, t. erefrom.

The nippleapplied to the tube forms an airtight closure thereto, keeping the contents moist and fresh for an indefinite perlod In use, the tube is collapsed to fill or partially fill the nipple and then the nipple is squeezed to discharge as much of the paste may be required. The incipient openmg 1s usually placed in the tip of the nipple as indicated, v

so the nipple may be pinched in from any side or any angle The winding up oi the tube prevents the material from hacking into the tube when pressure is applied to the nipple and the paste therefore stretches the rubber sufiiciently to create the discharge opening and to buckle the tip of the nipple outwardly more or less-after the manner indicated-in Figure 3. This stretching thins the rubber, producing a relatively sharp cutting edge such as indicated and as soon as pressure is released, the tip portion of the nipple buckles backwardly as indicated in Figure 4, biting off the end of the discharged paste and wedging any remaining paste out of the closing passage so that on the return to normal condition, as in Figure 5, the paste is cleanly severed and the passage is wholly cleared of material. The device therefore is effective from a practical standpoint and keeps the pasty matter clean and sanitary. The device, furthermore, has the important advantage of being relatively inexpensive and it may be made either as an integral part of the tube or be detachably connected therewith.

What is claimed is:

In paste dispensing, the combination with a collapsible paste tube having a discharge neck, of an elastic rubber nipple engaged over said neck and forming both a sealed tube closure and paste holder, said nipple having a highly elastic thin wall of substantially the same thickness throughout and continuous and iinperforate normally in the absence of pressure, said wall having a point of cleavage therethrough produced by a fine perforation formed therein while the material of the wall is stretched in an attenuated condition, whereby the natural contraetive eli'ort of the rubber is utilized to elliectually seal said perforation and whereby when paste is discharged therethrough and the expelling pressure is released, the eontractive action in closing the perforation becomes effective to cut off the paste and to squeeze the residual paste out of the closing opening.

In witness whereof, I have hereunto set my hand this th day of August, 1925.

ABBOTT P. BRUSH.

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