US739609A - Pneumatic tool. - Google Patents

Description

PATENTBD SEPT. 22, '1903.

B.' e; KQTTBN.' PNBUMATIG Toor..

APPLOATION FILED JUNI 8, 1903.

I0 HODEL.

@mi Cueoauag @QJ s UNITED STATES Patented september 22, 1903.

HERMAN e. ROTTEN, or NEW YORK, N. Y.

PNEuMATioTooL.

SPECIFICATION forming part of Letters Patent N o. 739,609, dated September 22, 1903.

Application filed J' une S, 1903. Serial No. 160,533. (Nomudel.)

To all whom it may concern.-

Be it known that I, HERMAN G. KOT'IEN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a new and useful Improvement in Pneumatic Tools, of which the following is a specification.

My invention relates to pneumatic tools 3" and it consists of a novel construction of a push-handle for the same, whereby the reciprocationsof the hammering-piston are automatically stopped without requiring any attention from the operator as soon as the pressure of thetool upon the work is relieved. It has heretofore been proposed to supply pneumatic tools of various ltypeswith graspinghandles and to provide these handles with various types of manually-operated levers or throttle-valve devices, and it has also been heretofore attempted to construct push-lian-- dles adapted to coact with throttle-valves operated by coil-springs and the like. In my present invention, however, I dispense entirely with the use of springs and provide a device which is automatic'under all conditions and requires no attention whatever from the operator, the number of parts andthe expense of manufacture are reduced to a minimum, andthe liability of damage to any of the parts is entirely obviated.

To the above ends my invention consists,

broadly, of the novel combination of a pneu-`V matic tool, a cylinder cap or head therefor, a differential throttle-valve mounted in' said cap, and a handle adapted to coact with said throttle-valve, the arrangement of the parts being such that upon the removalof the tool from the work or the releaseofthe pressure upon the handle the live-air"pressureiuponv the differential areal of the throttle-valve automatically closes the same and effects the Y represents, on a reduced scale, a detail view engaged bythe cylinder head or cap 3,7which` is adapted to be in threaded or other engagement therewith and is'Y held in the desired position by means of the' threaded bolt or other fastening device 4. In the body portion 5 of the cylinder-cap 3 is located the inlet-port or pressure-supply duct 6, into which compressed air is led through thecoupling air-'strainer 7, which is of the usual construction and is adapted to have the extremity of the compressed-'air inlet pipe or hose (not shown) connected thereto in Ithe usual manner. vIt will be understood that the coupling- 'strainer 7 is constructed in the conventional manner and! isfprovided with 'wire gauze,

through which the motive fluid is strained before reaching the working parts of the tool. I have deemed it unnecessaryto show this gauze and to describe the precise construction in f detail, since the same will be familiar to thosel skilled in this art. From' theinlet port or passage vt leads the passage 8 into the cham.-

berj9 of the vhollow differential distribution- 4valve 10 vcontained'in the valve-boxy 10X, it

being understood that when the parts are vin 'the' position seen in Fig. 1 the compressed .air passes. through the passage 9 and ports llinto the piston-chamber 12 and drives'the piston 2 downwardly from the position seen inFig.' l against" the chisel or 'other cuttin `tool.. (Not shown.)

When the pistou 2 moves from the positionseen in Fig. 1, it will be understood, that the exhaust takes place through the'passage and port 13 into the 'passage 14, (shown dotted in Fig. 1,) into the annular chamber 15, and out the port 16 in the cylinder-cap and the port 17 in the sleeve 18 of the handle 19 to the atmosphere, it being also understood that at the proper intervals live-air pressure enters the passage 2O and iiows through the passage 21 upon the larger or differential area 22 of the valve 10.

ICO

The pneumatic tool to which my invention is particularly adapted and which I have shown herein is the Well-known type of tool called the Keller tool, and the detailed operation of the valve and its piston will be understood from patent to Julius Keller, No. 647,415, granted April 10, 1900, a portion'of the tool therein being shown herein in Fig. 1; but I have deemed it unnecessary to show and described in detail the entire Keller tool, since it will be understood that the salient features of my present invention may be employed with other pneu matic tools with equal efficiency, and I have shown my invention applied to that form of tool which I consider most efficient in practice.

23 designates the automatic throttle-valve employed, the same consisting of the head 24, having the large differential area 25, and a smaller head 26, having a small differential area 32, said areas 25 and 32 being juxtaposed to each other, said heads being connected by the neck 27.

28 designates a Washer, of leather or other resilient or cushioning material, which is interposed between the cylinder-cap 3 and the contiguous Wall 29 of the handle 19.

30 designates a slot in the sleeve or extension 18 of the handle 19, the upper and lower extremities of which are adapted to contact with the head 31 of the coupling or strainer 7, whereby the movement of the handle 19 with respect to the cylinder-cap is limited, as

will be evident.

The operation is as follows: The parts normally appear as seen in Fig. 4. Assuming liveair pressure to be entering the pressure-supply passage or port 6, it will be apparent that the vflow of the same will be as already described When the parts are in the position seen `in Fig. l, which position they assume when the operator grasps the handle 19 and presses the tool against the work, the valve 23 assuming the position seen in Fig. 1, with its neck extending across the passage 6, and the exhaust- ports 16 and 17 being in alinement. The parts being in this position, the operation of the tool, or, in other words, the reciprocation of the piston, will occur without attention upon the part of the operator. As soon as the pressure is removed from the handle 19 or the tool is removed from its Work it will be apparent that the live-air pressure upon the large area 25 and upon the lower end of the piston 28 will cause the diiferential throttle-valve 23 to move in the direction indicated by the arrow a, whereupon the parts will appear in the position seen in Fig. 4, and the head 26 being now in the position seen will prevent the flow of compressed air tothe port 8, and the reciprocation of the piston will cease. At the same time the exhaust-port 17 will pass out of alinement With the port 16, as will also be seen in Fig. 4. The contact of the Walls of the slot 30 with the portion 31 of the strainer 7 will act as a stop for the handle and will prevent improper movement of the throttlevalve 23, handle 19, and their adjuncts.

It will be apparent that changes may be made in the manner of constructing and assembling the various parts as regards the form, operation, size, and minor details thereof Without departing from the spirit of my invention, and I therefore reserve to myself the right to make all such changes and do not desire to be limited in every instance to the exact construction I have herein shown and described.

yHaving thus described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. In a device of the character described, a cylinder head, a throttlevalve mounted therein and having dierential pressure areas juxtaposed to each other, a handle movably supported upon said head and means for `of said handle and means for permitting pressure upon said handle to open said valve.

3. In a device of the character described, a cylinder-head, having a pressure-supply duct extending therethrough, a throttle-valve consisting of a plurality of heads, having diiferential pressure areas joined by a neck, said neck being in alinement with said pressuresupply duct, when live air is being admitted to the working parts of the tool, and exhaustports in an extension of said handle and in said head, said ports being adapted to aline with each other when the throttle-valve is open and said ports being out of alinement when the throttle valve is automatically closed.

4. The combination of a tool-cylinder, a cylinder-head therefor, a valve-box, a distribution-valve contained in said box, means for securing said head to said cylinder, a throttle-valve in said head, moving in alinement with saiddistribution-valve, said throttle-valve consisting of a plurality of heads joined by a neck, the opposing surfaces of said heads having differential areas, a handle having an extension movably mounted upon said head, means for limiting the movement of said extension, and a Washer located between said head and handle.

5. The combination of a grasping-handle having a slot therein, a cylinder-cap upon which said handle is movably supported, a pressure-supply duct in said cap, a device communicating with said pressure -supply duct and adapted to enter said slot and limit IOO IIO

the movement of said handle, a washer located between said handle and cap, and a diiierential throttle valve, located in said pressure-supply duct, said throttle-valve consisting of heads of different diameters joined by a neck, whereby live-air pressure acting upon the large diderential area'closes said pressure-supply duct and the pressure of the handle upon the larger of said heads When the tool is applied to the head, opens said supply-duct.

6. In a device of the character specified, a cylinder-head, a 'grasping-handle' longitudinally movable thereon andl separate means operated by the movement of said handle forerated by duid pressure for closing said valve.

8. In a device of the character specified, a cylinder-head, an inlet air-passage in said head, a throttle-valvehaving heads of dierent diameters and a reduced neck therebetween, and a grasping-handle movable on said cylinder-head and operative to shift said valve so that its neck portion is interposed in said inlet-passage, said piston-heads being operative by means of the air entering said inlet-passage to actuate one of said heads to cut o the flow of air therethrough. Y

9. In a device of the character specified, a cylinder-head, a throttle-valve movable there= in, and a handle manually movable on said head and operative to open said valve, said valve having an enlarged differential pres sure area, whereby it closes and retracts said handle when manual pressure is removedv therefrom. I

HERMAN G. KOTTEN. Witnesses:

H. C. BROWNE,

W. J. ToMLINsoN.

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