US1955029A

US1955029A - Fluid dispensing gun

Info

Publication number: US1955029A
Authority: US
Inventors: Albert A Smallhouse
Original assignee: CHARLES E BECK
Current assignee: CHARLES E BECK
Priority date: 1933-02-23
Filing date: 1933-02-23
Publication date: 1934-04-17
Anticipated expiration: 1951-04-17

Description

April17, 1934- A. A. SMALLHOUSE 1,955,029

FLUID DISPENSING GUN Filed Feb. 23, 1933 A TTORNEY Patented Apr. 17, 1934 UNITED STATES FLUID DISPENSING GUN Albert A. Smallhouse, Los Angeles, Calif., ae-

signor, by direct and mesne assignments, to Charles E. Beck, Los Angeles, Calif.

Application February 23, 1933, Serial No. 658,082

9 Claims. (01. 221-44) This invention has relation to a device for dis pensing fluid under high pressure through a nozzle, such as a lubricating gun, paint or chemical sprayer and the like. For the sake of simplicity of description, the device is hereinafter referred to as a grease gun, but with the understanding, that it is adaptable for such other purposes as above suggested.

The general object of my invention is the provision of a simple and highly eflicient device of the kind referred to. More particularly one of my objects is to provide a self-closing device, by which I mean, a device the nozzle of which automatically closes when the pressure within the gun is relieved. Other objects and important features of the invention are hereinafter fully set forth and illustrated in the appended drawing, of which:

Fig. 1 is a side elevation, partly in section, of 20 a device embodying the invention,

Fig. 2 illustrates, on a larger scale, the nozzle construction of the device, and

Fig. 3 is an end view taken on line 3-3 of Fig. 2, in direction of the arrows.

frame 1, a nozzle structure 2, and a connecting hose 3. The frame is at the rear end shaped for attachment to a device for delivering fluid under high pressure, and it includes a dispensing valve which may be of any suitable construction and which terminates in a plunger 4 for operation by a lever 5. The latter is shown pivotally mounted to swing within a guard 6 of the frame. The latter is made with a hand grip 7, and this grip and the lever 5 are conveniently positioned and arranged for one-hand operation.

The end of the lever 5 is made with a groove shaped to ride on a ridge 8 of the frame guard. This is very important because experience has shown that, without such guide, it does not take long for the lever fulcrum joint to wear sufficiently to throw the lever out of line with plunger 4, when the lever is manipulated by the closing fingers of the operator, which have a tendency to throw the lever to one side.

It is important to note, that the grip 7 is made with axially directed layers of

ribs

9 and 10, tapering towards the front. Particularly in garages, where devices of this kind are much used for lubricating automobile engines and running gear, are these superimposed ribs advantageous, as they effectively prevent slipping of greasy hands and insure perfect control of the gun.

The construction of the nozzle 2, of my 1m- The device of my invention comprises a valve proved gun, is shown in Fig. 2 to comprise a tapering shell 12, internally threaded to engagescrew threads of the nozzle head 2. In the annular space between these two parts, is seated a plug comprising a disk shaped plate 13, from which a threaded hub 14 projects forwardly. This plate is shown made with a. plurality of perforations for the passage of the fluid to be dispensed. A relatively powerful spring 15 is shown having one end mounted on this hub by a simple engagement of the hub threads with the windings of the spring. If the pitch and diameter of the two parts are properly proportioned, a very powerful connection is made in this manner. A conical stopper 16 is made with a hub portion 17, and this hub is similarly threaded to receive the forward end of the spring 15. This stopper normally maintains the gun nozzle closed but, as the spring is free to yield to the pressure of the dispensing fluid, while the valve 1 is open, itfollows that the stopper is free to move forward to permit ejection of this fluid.

When the valve is permitted to close, and the pressure behind the dispensing fluid thereby is relieved, it is found, that the tension of the spring 15 becomes sufficient instantly to close the orifice of the nozzle. The advantage of this construction should be clear to anyone familiar with the use of fluid dispensing guns. In ordinary guns, after the control valve becomes closed and the as pressure relieved, it is found that the fluid continues to flow for a short space of time due, perhaps mostly to contraction of the hose from the valve to the nozzle, which hose had expanded slightly under the heavy pressure.

The nozzle of my invention must necessarily be largerv in diameter than it would have to be without the self closing stopper feature. And it is found that, when used as a grease gun, the openings into which the nozzle is insertable, are 5 smaller than the nozzle. In such cases it becomes necesary to employ an adapter, and such adapter is in the drawing shown to consist of an elbow 20, one leg of which is provided with a tapering bore of a size to admit and fit the taper 1 of the nozzle shell 12. The other end of the elbow is shown tapering down to the normal nozzle size, for insertion in such small openings. The elbow shape of this adapter is very advantageous, making' it convenient, by a mere turning of the 5 adapter on the shell, to serve openings not readily reached with a fixed nozzle. Particularly is this true in lubricating automobiles, where the operator is compelled to work underneath the body of the car and has to reach around parts no to flnd lubricating orifices positioned on top of such parts. With a fixed nozzle this is extremely difficult to do.

The structure hereinbefore described issatisfactory in every respect. The spring 15 performs its function perfectly, eliminating waste of fluid, after the valve is closed. But a spring might be defective, or the plunger and spring connections might break down for some reason, permitting the stopper 16, and perhaps the spring, to be expelled with the dispensed fluid. These expelled parts might then land in the gears of the automobile and cause considerable damage.

To safeguard against such accident, I provide a check on the movement of the stopper 16, and such checking means is here shown to consist of a rod 23, one end of which is anchored in the stopper 16. The latter is preferably a die casting, in which case the rod may be inserted into the mold before the metal is poured, to form a homogeneous part of the stopper. The opposite end of the rod is caused to pass through a central bore of the plug 13, whereupon its end is bent, or upset, as indicated at 24, to prevent removal of the rod from the plug. In such manner, the movement of the stopper is limited and damage due to breakage of the parts prevented.

In Fig. 3, the plug 13 is shown modified to form a, spider 25. This may be found a better construction, where heavy grease is used, as it offers less resistance to the passage of the fluid.

I claim:

1. I na device for ejecting fluid under pressure, anozzle, a conical stopper terminating in a threaded shank, a,spring support seated in the nozzle and having a similar threaded hub, and a helical spring having its ends engaging the screw threads of said shank and hub to urge the stopper against'the mouth of the nozzle but capable of yielding to the pressure of the fluid forced through the device.

2. In a device for ejecting fluid under pressure, a nozzle, a conical stopper for closing the mouth of said nozzle, and a coil spring one end of which is fastened to the stopper and the other end fastened to a part of the nozzle, said spring yieldingly urging the said stopper into closed position but able to yield to the pressure of the fluid impinging upon said stopper.

3. In a device for ejecting fluid under pressure, the combination with means for controlling the passage of the fluid, of a nozzle, a stopper for closing the mouth of said nozzle, a coil spring one end of which is fastened to said stopper and the other to a part of the said nozzle, said spring yieldable to the pressure of the fluid against the said stopper to permit the stopper toopen, and

means independent of said spring for limiting the yielding movement of said stopper.

4. In a device for ejecting fluid under pressure, the combination with means for controlling the passage of the fluid, of a nozzle, a stopper, a coil spring one end of which is attached to said stopper and the other end of which is fastened to a part of the said nozzle for the purpose of; yieldingly drawing the stopper against the nozzle mouth when the fluid pressure is relieved by said controlling means, and means independent of said spring for limiting the yielding movement of said stopper.

5. In a device for ejecting fluid under pressure, a nozzle, a conical stopper for closing the mouth of said nozzle, a perforated member seated in the opposite end of the nozzle, and a coil spring one end of which is fastened to the said stopper and the other end to the said perforated member, said spring able to yield to the pressure of the fluid passing through said perforated member and impinging upon said stopper.

6. In a device for ejecting fluid under pressure, the combination with means for controlling the passage of the fluid, the end of said means having screw threads, a nozzle internally threaded to engage said screw threads, a perforated member held seated in said nozzle between a shoulder of the nozzle and the threaded end of said controlling means, a stopper for closing the mouth of the nozzle, and a coil spring one end of which is fastened to said stopper and the other end to the said perforated member.

7. In a gun for ejecting a fluid under pressure, manual means for controlling the flow of said 110 fluid, a nozzle, a conical stopper, a support within the nozzle, a spring holding said nozzle suspended from said support and pressed against the nozzle month, said spring being capable of yielding to the pressure of the fluid in the gun, a rod 115 inwardly extending from said stopper and seated in said support, said rod being shaped for limited axial movement within said support.

- 8. In a device for ejecting fluid under pressure,

a nozzle, means seated in the nozzle for closing 120 the nozzle mouth but capable of yielding to the pressure of the fluid in the device, and an adapter seatable on the nozzle to reduce the size of the nozzle end.

9. In a device for ejecting a fluid under pressure, a nozzle, means seated in the nozzle for closing the nozzle mouth but capable to yield to the pressure of the fluid in the device, and an elbow shaped adapter having one end bored to flt the tapering outer surface of the nozzle and terminating ,at the other end in a reduced size nozzle.

ALBERT A. SMALLHOUSE.