US2417140A - Vaccinating gun - Google Patents

Description

,Match 11, 1947.

F. J. swANsoN VACCINATING GUN v Filed April 17, 1945 ATr'n R N EYS @Patented Mar. 11, 1947 UNITED STATES PATENT OFFICE VACCINATING GUN Francis J. Swanson, Saratoga, Wyo. Application April 17, 1945, Serial No. 588,817

The invention relates to a gun and more especially to a vaccinating gun or serum shooter.

.The primary object of the invention is the provision of a gun or shooter of this character, wherein the same which is of standard construction can be operated single-handed, so as to enable the injection of vaccine within a human being or an animal with ease and dispatch, the gun being equipped with a trigger mechanism, which is conveniently operated, to enable the gun to be much faster and more accurate than any ordinary guns now in use.

Another object of the invention is the provision of a gun of thisl character, wherein it is supplied with a pistol grip and a trigger having seal' action on the plunger, so that the gun can be operated with one hand and a graduated dose of vaccine can be discharged therefrom from one to ve (1 to 5) cc. per stroke of the plunger with accuracy, the grip and trigger fitting being of novel construction and is unique in the arrangement thereof.

A further object of the invention is the provision of a gun of this character, which is simple in construction, thoroughly reliable and effective in operation, strong, durable, readily and easily handled single-handedly, accurate in the working thereof, readily and easily adjusted, and inexpensive to manufacture and install.

With these and other objects in View, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawing, which shows the preferred embodiment of the invention and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a side elevation of a vaccine gun showing the pistol grip and trigger mechanism constructed in accordance with the invention applied thereto, the grip being partly n section.

Figure 2 is a fragmentary side view thereof.

Figure 3 is a sectional view taken on the line 3--3 of Figure 1 looking in the direction of the arrows.

Figure 4 is a sectional view taken on the line 4--4 of Figure 1 looking in the direction of the arrows.

Figure 5 is a sectional View taken on the line 5-5 of Figure 1 looking in the direction of the arrows.

Figure 6 is a fragmentary side view partly broken away.

Figure 'l' is a sectional view taken on the line 'l-1 of Figure 6 looking in the direction of the arrows.

4 Claims. (Cl. 128-2Z4) Figure 8 is a View similar to Figure 6 showing the trigger in adjusted position.

Similar reference characters indicate corresponding parts throughout the several views in the drawing.

Referring to the' drawing in detail, A designates generally a vaccine gun or syringe of any standard construction, having a sight window I0 in each side thereof, as usual, and this gun or syringe is provided with a hand actuated plunger II for dispensing the vaccine as contained within the same through a discharge nozzle or needle i2 of common construction.

The gun at its barrel I3 is fitted with a pistol grip or handle I4 which has the said barrel saddled at I5 therein, while this barrel I3 is adjustably clamped to the handle by a friction clip or band I6, which is held fixed by a coupling bolt I1 anchored in a cross web I8 integrally formed in the grip or handle I4.

On the grip or handle I4 `forwardly thereof is a forked bearing I9 in which is a vertically swinging trigger 20, which is journalled on a horizontal pivot 2I fitting such bearing i9, the trigger being acted upon by a spring 22 which returns it to normal position after being pulled for the operation of the gun or syringe A, as hereinafter described.

Slidably fitted in guideways 23 and 2Q, respectively, as provided in the grip or handle III is a throw link 25, which carries a cooking sear 2t, adapted for ratchet engagement with a toothed rack 21 formed on the plunger stem or shank 28, which is provided with exposed graduated scale marks or indicators 29 longitudinally thereof which coordinate with a scale beam 3Q on the barrel I3 so that a determined amount of vaccine can be dispensed from the latter on the automatic working of the plunger II for administering to a human being or animal from 1 to 5 cc. doses, the

gun being usable by medical or veterinary professions.

The gasket cap 3l of the barrel. i3 through which the plunger operates is provided with a hand manipulated cam 3.2 which works against the link 25 to throw the sear or dog Z out of engagement with the rack 21, against the resistance of an adjustable tensioning device 33 fitted within the grip or handle I4fto urge the scar or dog into engagement with the said rack 21 when released by the cam 32, which is hand shifted by a thumb or iinger piece 34, the cam being rotatably tted on the gasket cap 3l, as best seen in Figures 5, 6, 7 and 8 of the drawing.

To operate the gun A, it is necessary to actuate the cam 32 so as to free the plunger II which is hand pushed inwardly of the barrel I3 when the plunger has been set for the discharge of a determined amount of vaccine from the gun or syringe A. Then when the desired dose is registered by the scale, the cam is released so that when the trigger 20 is pulled, the plunger H is driven inwardly to dispense the dose from the gun or trigger A as should be obvious. The link 25 is urged into engagement with the rack 2l! by the device 33.

The gun or syringe A is susceptible of operation by one hand of the user.

What is claimed is:

1. A gun of the kind described, comprising a barrel, a plunger Working Within the barrel and having a stem provided with a toothed rack, a handle grip carried by the barrel, a pull trigger pivoted to the grip and having a sear engageable With the rack for moving the plunger, a gasket cap mounted on the end of said barrel, and cam means mounted on the gasket cap on the end of the barrel through Which the plunger operates for releasing the Sear from the rack.

2. A gun of the kind described, comprising` a barrel, a plunger Working Within the barrel and having a stem provided with a toothed rack, a handle grip carried by the barrel, a pull trigger pivoted to the grip and having a sear engageable with the rack for moving the plunger, a gasket cap mountedon the end of said barrel, means for releasing the sear from the rack and cam means mounted on the gasket cap on the end of the barrel through which the plunger operates, for releasably urging the sear into engagement with the rack.

3. A gun of the kind described, comprising a barrel, a plunger working Within the barrel and having a stem provided with a toothed rack, a handle grip carried by the barrel, a pull trigger pivoted to the grip and having a Sear engageable with the rack for moving the plunger, a gasket cap mounted on the end of said barrel, means for releasing the sear from the rack, cam means mounted on the gasket cap on the end of the barrel through which the plunger operates for releasably urging the sear into engagement with the rack and means for adjustably clamping the grip to the barrel.

4. A gun of the kind described, comprising a barrel, a plunger Working Within the barrel and having a stem provided with a toothed rack, a handle grip carried by the barrel, a pull trigger pivoted to the grip and having a sear engageable with the rack for moving the plunger, a gasket cap mounted on the end of said barrel, cam means mounted on the gasket cap on the end of the barrel through which the plunger operates for releasing the sear from the rack, means for releasably urging the sear into engagement with the rack, means for adjustably clamping the grip to the barrel and graduated scales on the stem and barrel for coordination with each other.

FRANCIS J. SWANSON.

REFERENCES CITED The following references le of this patent:

UNITED STATES PATENTS are of record in 'the

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