US1042512A - Motive-fluid-operated tool. - Google Patents

Description

D. s. WAUGH. MOTIVE FLUID OPERATED TOOL. APPLIUATION FILED JUNE 5,1911.

Patented Oct. 29, 1912.

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D. S. WAUGH.

MOTIVE FLUID OPERATED TOOL.

APPLIOATION FILED JUNE5,1911.

1 ,042,5 1 2, Patented 001]. 29, 1912. 2 SHEETS-SHEET 2 w I I El I I" WM w 4. 1 l Allorney DANIEL SHAW WAUGH, OF DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCK DRILL & MACHINERY CO., 01-? DENVER, COLORADO, A CORPORATION OF COLORADO.

MOTIVE-FLUID-OPERA'IED TOOL.

Application filed June 5, 1911.

To all whom it may concern:

Be it known that I, DANIEL S. VVAUGH, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented new and useful Improvements in Motive Fluid Operated Tools, of which the following is a specification.

The present invention relates to motive fluid operated tools, and the primary object is to provide simple and effective mechanism for governing the supply of motive fiuid thereto, to effect the reciprocation or movement of the piston, said means being readily accessible.

A further object is to provide an arrangement that will eliminate all danger of side thrust of the piston at the end of its return stroke, thereby insuring a quick initial start of said piston on its working stroke.

A still further object is to provide novel and effective means for maintaining the handle of the tool in position on the body of the same, while permitting a relative rotation between the body and the handle.

The preferred embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a longitudinal sectional view therethrough. Fig. 2 is a similar view at right angles to Fig. 1. Fig. 3 is a cross sectional View on an enlarged scale and on the line 33 of Fig. 1. Fig. 4 is a side elevation of the valve. Fig. 5 is a longitudinal sectional view' through the valve sleeve.

Similar reference numerals designate corresponding parts in all the figures of the drawings.

In the embodiment illustrated, a cylinder member 6 is employed, having a chamber 7 that contains the usual reciprocatory piston 8. Secured to one end of the cylinder member is a tappet casing 9 containing a tappet 10 that is struck by the piston 8. This tappet casing 9 furthermore carries a chuck 10 for receiving a drill bit or other tool. Secured to the opposite end of the cylinder member 6 is a head 11. that is held against rotation by a pin 12 threaded into the end of the cylinder member, and engaging in a socket 13 formed in the head. This head has oppositely projecting ears 14, through which are passed securing bolts 15 that also pass through corresponding ears 16 formed 5 in the tappet casing 9. V The head 11 is pro- Specification of Letters Patent.

Patented Oct. 29, 1912.

Serial No. 631,403.

vided with a stem portion 17 011 which is rotatably mounted the hub 18 of a suitable handle 19. This hub is provided at its inner end with an outstanding annular flange 20, over which are engaged retaining clips 21 that are secured upon the head 11 by the bolts 15. It will thus be observed that these bolts, not only serve to hold the tappet casing 9 and the head 11 to the cylinder member, but also constitute fastening means for the handle 19, while permitting a relative rotation between said handle member and head.

Formed upon one side of the cylinder member 6 is a valve chest 22 having atransversely disposed open ended chamber 23 that is surrounded by three annular grooves 24, 25 and 26 formed in the inner wall of said chest. Motive fluid is supplied to the central or intermediate groove 24, through a port 27 leading from a chamber 28 and receiving the motive fluid through a pipe or hose line (not shown) coupled at the point 29. A throttle valve 30, movable to and from a position to close the port 27, constitutes the means for permitting or cutting off the supply of motive fluid to the annular groove 24. From the annular groove 25, a plurality of ports 31 lead to the rear end of the piston chamber 7, and formed in said end, are a plurality of annular shallow grooves 32 that intersect the ports 31, as shown in Fig. 2. Leading from the other annular groove 26 of the valve chest, is a conduit or port 33 that extends longitudinally in one wall of the cylinder member 6, and opens into the front end of the piston chamber 7, as shown at 34 in Fig. 1. The ports 31 and 34 are located on opposite sides of the piston 8.

Fitting snugly in the chamber 23 of the valve chest, is a sleeve 35 having a plurality of central radial ports 36 that communicate with the central or intermediate groove 24. Other radial ports 37, formed in one end of said sleeve communicate with the groove 25, while a third series 38 and 38 are in communication with the groove 26. The sleeve 35 has the end portions of its bore of different diameters and an automatic reciprocatory valve of the diiferential type, designated generally by the reference numeral 39, is mounted in said bore. One end 40 of this valve is of less diameter than the other end 41, and the intermediate portion of the valve is cut away to form an annular groove 42 that is at all times in communication with the annular groove 24 through the openings 36. The valve is capable of sufficient move ment in the sleeve to permit the groove 42 to bring the central or intermediate groove 24 into communication alternately with the grooves 25 and 26, by alternately uncovering the openings 37 and 38, as will be evident. The automatic valve further more has a longitudinal exhaust passage 44 formed entirely therethrough.

The open ends of the chamber 23 of the valve chest are closed by caps 45 and 46, which are maintained in place by a single bolt 47 that passes centrally therethrough, and centrally through the passage 44 of the valve 39. The bolt, it will be observed by reference to Fig. 3 is of less cross sectional area than. the passage so as to permit the flow of motive fluid through said passage. The cap 45 is provided with a plug portion 48 that projects inwardly and is adapted to enter the open end of the passage 44 when the valve is shifted to the right in Fig. 3. It is also provided with a transverse port 49 communicating with a port 50 in the valve chest, which port leads from a conduit 51 formed in one wall of the cylinder and ext-ending to a port that opens into the piston chamber 7, as illustrated in Fig.

2. The port 49 is in communication with an annular groove 53 formed in the inner face of the cap directly around the plug 48. The cap 46 has an internal chamber 54 that communicates with the interior of the sleeve 35 and with the passage 44, this plug furthermore having exhaust openings 55 communicating wit-h the chamber 54.

The operation of the mechanism may be described as follows: With the parts as shown in Fig. 3, if the valve 30 is opened, motive fluid will pass through the port 27 into the central groove 24, and through the ports 36 into the groove 42 of the valve. The right hand wall being of greater area than the left hand wall of said groove 42, the difference in pressure will cause the valve 39, to move to the right, thereby bringing the ports 36 into communication with the ports 37, so that the motive fluid will pass from the groove 24 into the groove 25, and through the ports 31 into the rear end of the piston chamber 7 behind the piston 8, causing the same to be driven to and against the tappet 10. YVhen the valve 39, thus moves to the right, it will be evident that the conduit 33, which extends to the front end of the piston chamber will be opened to the outer air, as the left hand end of the valve will uncover the ports 38, and

the air can flow through said conduit 33, ports 38, chamber 54 and exhaust outlets 55 to the exterior of the tool. Just prior to the time the piston 8 strikes the tappet 10, it

will be shifted to the opposite limit of its movement, thereby bringing the central groove 42 into communication with the left hand groove 26 through the medium of the ports 36 and 38 and the groove 42. As a result, the motive fluid under pressure will pass through the conduit 33 and port 34 into the piston. chamber 7 in front of the piston 8 and cause its return movement. At the same time, the right hand end of the valve will uncover the ports 37, thereby permitting the exhaust to take place through the ports 31, groove 25, ports 37, passage 44 into the chamber 54, and out through the openings 55. As soon as the piston 8 upon its return movement again covers the port 52, the pressure of the motive fluid through the conduit 51, ports 50 and 49 and groove 53 will be relieved, and as a consequence, the valve 39 will move to an intermediate position toward the right, governed entirely by the exhaust of fluid through the ports 31, groove 25, ports 37 and bet-ween the inner end of the plug 48 and the right hand end of the valve into the exhaust passage 44, and out through the chamber 54 and open ings 55. As the piston 8 approaches the limit of its return movement, it will pass across the annular grooves 32 and the ports 31, thereby stopping the exhaust as explained, and permitting the differential pressure to again move the valve to the right, whereupon the piston 8 will start on another working stroke, being cushioned at the end of its return movement, and started on said working stroke by the compression of air in the rear end of the piston chamber 7 behind the ports 31 and grooves 32. As soon as it passes the first of said ports 31, the motive fluid again begins to act on the piston.

In this structure, it will be noted that the clamping washers, which hold the handle construction, operation and many advantages of the herein. described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size,

shape, proportion and minor details of construction, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an instrument of the character set forth, the combination with a motor, of means for supplying motive fluid thereto,

a fluid operated valve for controlling the motive fluid supply, said. valve having a motive fluid passageway therethrough, a

chest containing the valve, a closure for the chest having a port in communication with the passageway, and fastening means for the closure passing through the motive fluid passage in the valve and of less cross secticnal area than the same.

2. In an instrument of the character set forth, the combination with a motor, of means for supplying motive fluid thereto, a fluid operated valve for controlling the motive fluid supply, said valve having an exhaust passageway longitudinally therethrough, a chest containing the valve, a detachable closure for one end of the chest having an exhaust port communicating with the outer atmosphere, and also in communication with the longitudinal passageway, and a fastening bolt for the closure passing through the exhaust passage in the valve and of less cross sectional area than the same.

In an instrument of the character set forth, the combination with a motor, of means for supplying motive fluid thereto, a reciprocating fluid operated valve for controlling the motive fluid supply, said valve having an exhaust passage extending longitudinally therethrough, an open-ended chest containing the valve, detachable closures for the end of the chest, one of said closures having an inwardly extending nipple that enters the exhaust passage when the valve is in one position, the other closure having an internal chamber in communication with the exhaust passage and communicating with the outer atmosphere, and a holding bolt passing through the closures and longitudinally through the exhaust passage of the valve, said bolt being of less cross sectional area than the passage to permit the exhaust to pass therethrough.

4. In an instrument of the character set forth, the combination with a motor, of a valve chest having an internal chamber and a plurality of internal grooves, means for supplying motive fluid to one of the grooves, the other grooves having communication with the motor, a valve sleeve fitted in the chamber and having ports communicating with the grooves, a fluid operated reciprocatory valve mounted in the sleeve and controlling the ports, said valve having an openended exhaust passage therethrough, closures for the ends of the chest holding the sleeve in place, one of said closures controlling the exhaust passage, the other having exhaust ports communicating with said passageway, and a holding bolt passing longitudinally through the exhaust passage and engaged with the closures to maintain the same in position, said bolt being of less cross sectional area than the exhaust passageway, to permit the free flow of fluid therethrough.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

DANIEL SHAWV VVAUGH.

lVitnesses:

H. LEONARD, J AS. R. ELMENDORF.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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