US758100A - Handle for pneumatic tools. - Google Patents

Description

PATENTED APR. 26, 1904.

0. H, PEGK. HANDLE FOR PNEUMATIC TOOLS.

APPLIGATION I'ILED JAN. 16, 1904.

H0 MODIBL.

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,A: ATTORNEYS;

UNITED STATES Patented April 26, 1904.

P TENT OFFICE.

oAIn PEoK, or WAVERLY, NEW YORK, ASSIGNOR 'To IMPERIAL PNEUMATIG TOOL COMPANY, or ATHENS, PENNSYLVANIA, A COR- POBA'IION or NEW YORK.

. HANDLE FOR PNEUMATIC TOOLS- SPECIFICATION forming part of Letters Patent No. 758,100, dated April 26, 1904.

application filed J annarylii, 1904.- Seria1N0.189,331. "(No model.)

To all whom it may concern:

Be it known that I, CAID H. PEoK, acitizen ofthe United States of America, and aresident of WVaverly, county of Tioga, State of New York, have invented certain new and useful Improvements. in Handles for Pneumatic Tools, of which the following is a specifica-. tion, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in pneumatic tools, and particularly to handles therefor.

The term i handle is often applied to that portion of pneumatic tools comprising the head-block and the handle proper, and in the title and general descriptionof this invention I have adopted and applied the term as a mat-- ter of convenience, while in the more precise claims I have carefully differentiated between the head-block and the handle proper.

In the most approved form of pneumatic tools at present in use it is customary to provide means for controlling passage of motive fluid to the pneumatic tool .by means of an operating-lever having a thumb-piece in prox i'mityto the grasping portion of the handle, so that operation of the tool may be readily controlled by movement of thelthumb of thehand supporting the tool.

In mypresent invention I provide the headblock With an inlet-duct and mount avalve for controlling the inlet-duct in the said headblock. I then provide the grasping portion of the handle with an operating-lever and problock, so that the valve and the valve-seat I may be readily removed and replaced when desired. The Valve is of the puppet for1n having a puppet-head arranged toengage a valve-face to which it is fitted, and the por-' tion of the valve-stem immediately beneath the puppet-head is taperechwhile the portion of the valve-seatsurrounding it is cylindrical. By this arrangement a very sensitive graduation of supply in the movements of the valve is obtained in a very simple manner. The

.piece facing outwardly. The front portion of the operating-lever has a cam-facefor en- I gaging the rear end of the intermediate lever. The intermediate lever is pivoted in a slotted portion of the shank of the handle or that part of the handle which connects the graspQ ing portion with the head-block. By prop- ,erly shaping the cam-face of the lever the valve may be controlledto the best advantage I with the minimum exertion. arranged as to balance,'so far as fluid-pres sure is concerned, while being operated, so that there'is no resistance from the motive .fluid upon the operating-lever at such times.

' "The object of my invention is to improve and simplify pneumatic tool-handles, render the parts easy of access and simple'of manufacture, to improve the sensitiveness of the jvalve control, and to reduce the length of the air-inlet duct to a minimum. r

To these ends my invention consists 1n certain details of construction and combination ofoperating-lever is arranged in a slot in the grasping portion of the handie with the thumb The valve isso parts, as will hereinafter be fully pointed out.

I will now proceed to describe a device embodying my invention and will then point out the novel features in claims.

In the drawings, Figure 1 is a view inside elevation of a pneumatic tool-handle embody- .ing my invention. Fig. 2 is a view 'in central vertical section therethrough. Fig; 3 is an end view of same.

The handle as a whole comprises a head- 'block 1, having an external screw-threaded extension 2, by which it may be secured to the tool proper, a grasping portion 3, and a shank 1. The head-block 1 is recessed at 5 to form a Valve-chamber and receive 'a valveseat 6, fitted thereto and secured in place by a screw-threaded connection 7. A boss 8 projects rearwardly from the head-block and is arranged to receive the end of a flexible hose arranged for conveying motive fluid to the tool. The inlet-duct 9 passes through the boss into the valve-chamber 5. The head-block is bored out at 10, such bore opening into the recess 5, to which the valve-seat is fitted at one sideand at the other side communicating with a smaller bore 11, arranged for receiving and guiding the stem of the controllingvalve. The controlling-valve comprises a puppet-valve head 12, fitted to a suitable valveface in the valve-seat 6, a stem 13 projecting rearwardly of said valve-face, a tapered neck 14 immediately in front of said valve-face, and a valve-stem 15 fitted to the bore 11. The valve-stem 15 penetrates to the exterior of the bore 11 into a slot 16 transverse of the head block and extending longitudinally through the shank 4.. A similar slot 17 is arranged in the grasping portion of the handle 3, and an operating-lever 18 is pivotally mounted at 19in said slot 17. The operating-lever 18 has a thumb-piece 20, which projects rearwardly of the handle, an operating cam-face 21, and a portion 22, arranged to abut against the wall of the slot 17, so as to form a stop, limiting the movement of the lever in one direction. An intermediate lever 23 is pivotally mounted at 24 in the slot 16, the rear end of the lever engaging the camface 21 of the operating-lever 18 and the front end of the lever resting against the outer end of the valve-stem 15.

When the grasping portion of the handle is grasped in the usual way, the thumb will naturally rest upon the thumb-piece 20 of the operating-lever 18. A slight pressure of the thumb will cause the cam-face 21 to so act upon the intermediate lever 23 as to raise the rear end, depress the forward end, and hence depress the controlling-valve, so as to withdraw the valve-face 12 from its seat. Because of the tapered formation of the neck 14 the first movement of the controlling-valve will only permit a small quantity of motive fluid to pass. Further pressure upon the thumb-piece will cause the valve to be opened wider and wider, whereby a graduated admission is obtained, giving easily and readily the required amount of admission. A spring 25 opposes movement of the valve and tends to return same to its seat. It will be noted that the valve is balanced as to fluid-pressure while being operated, so that there will be no tendency for the motive fluid itself to force the valve to its seat, a light spring only being employed for this purpose. The action of the valve by reason of this will be very much more sensitive and delicate than if opposed by the motive fluid.

What I claim is- 1. In a pneumatic tool the combination with a head-block having an air-inlet duct therein, of a valve mounted in said head-block controlling said air-duct, a handle connected to said head-block, an operating-lever mounted in said handle and having a wedge-action camface, and an intermediate lever between the stem of said valve and said operating-lever, arranged to engage said cam-face and be operated by the wedge action thereof.

2. In a pneumatic tool the combination with a head-block having an air-inlet duct therein, of a valve mounted in said head-block controlling said air-duct, a handle connected to said head-block, an operating-lever mounted in said handle and having a wedge-action camface, and an intermediate lever between the stem of said valve and said operating-lever, arranged to engage said cam-face, the coacting ends of the said levers arranged to move in opposite directions when operated.

3. In a pneumatic tool the combination with a head-block having an opening for receiving a valve and stem, extending all the way there through from one side to the other, said opening adapted at one end to receive a valve-stem, and enlarged at the other end to form a valvechamber, and having an airinlet duct therein entering laterally from the exterior thereof into the valve-chamber end of the opening therein, of a valve arranged in said valvechamber and having a stem fitted to the said opening in the head-block and valve-operating means engaging the protruding end of said valve-stem substantially as set forth.

4. In a pneumatic tool the combination with a head-block having an opening for receiving a valve and stem, extending all the way therethrough from one side to the other, said opening adapted at one end to receive a valve-stem, and enlarged at the other end to form a valvechamber, and having an air-inlet duct therein entering laterally from the exterior thereof into the valve-chamber end of the opening therein, of a valve-seat removably fitted to said valvechamber, a valve in said valvechamber fitted to said valve-seat and having a valve-stem fitted to the said opening in the head-block, and valve-operating means engaging the protruding ends of said valve-stem substantially as set forth.

5. In a pneumatic tool the combination with a head-block having an air-inlet duct therein, of a puppet-valve for 'controlling admission through said inlet-duct, said puppet-valve having a guiding-stem and a tapered neck, said tapered neck fitted to a substantially cylindrical bore in the valve-seat, and valve-op- IIC erating means for engaging the said valvefor both saidstems being open to the atmos- Y stem.

6. In a pneumatic tool the combination with a head-block having an air-inlet duct therein, of a puppet-valve for controlling admission through said inlet duct, said puppet-valve having a front and rear stem guided in the said head-block, the outer ends of the guides phere. 1o

\ In Witness whereof I have hereunto set my hand this 14th day of January, 1904.

CAID H. PECK. Witnesses:

CHAS. KELLOGG, JOSEPH W. BEAMAN.

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