US1566096A - Reversible throttle handle - Google Patents

Description

Dec. l5 1925- F. A. JIMERSON nzvxslu: THROTTLE HANDLE Filed lay yl2, 1925 .MITI/nero'on HIS ATTO FY Patented Dec. 15, 1925.

estacas UNITED-STATES PATENT OFFICE.

FRANCIS A. J'IMERSON, OF ATHENS, PENNSYLVANIA, ASSIGNOR TO ING-ERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

REVERSIBLE THROTTLE HANDLE.

Application'flled May 12, 1925. Serial No. 29,683.

To all whom t may concern y Be it known that LFRANCIS'A. JIMERsoN, a citizen of the United States, and a resident of Athens, in the county of Bradford and State ot Pennsylvania, have invented a certain Reversible Throttle Handle, of which the following is a specification, accompanied by drawings.

yThis invention relates to fluid actuated rotary tools, such as rotary 'drills' and the like, but more'particularly to a reversible throttle handle for vmachines of this type, in which the reversing valve for the machine is located inside the handle'itself. A somewhat similar machine is disclosed in my copending application Serial No. 20,060 filed May 9, 1925, in which the reversing valve is, however, located outside the handle, and 0peratively connected to be actuated by movement of the handleV sleeve. The handle valve of the present application may also be applied to the machine in my copending application Serial No. 29,061 filed May 9, 1925.

rllhe objects of the present invention are to enable the throttle valve and reversing valve to both be located inside the handle and operatively connected, so that the throttle valve has a neutral position to which it automatically returns when the handle sleeve is released, and said valve must pass through neutral position upon reversing rotation of themotor. l

The invention is shown in one of its preferred forms in the accompanying drawings, in which f y v Figure 1 is a longitudinal sectional view of a rotary drill having my improved throttle handle applied thereto with the'throttle valve in closed or neutral position,

Figure 2 is a detaillongitudinal sectional 'view taken through a portion of the handle in a plane at right angles to the plane ofthe section of Figure 1 showing the throttle valve open, and

Figure 3 is a detail view of a portion of the handlepartly broken away and in longitudinal section showing the handle cam.

Referring tothe drawings, the case A is provided with an enlarged chamber B at its rearward portion withinwhich the cylinders extend, of which there are three in the present instance, only two cylinders C and D being shown in Figure 1 owing to the longitudinal section on which the drawing is 4 nectingV rods G suitably connected to a coinmon crank Apin H on a longitudinally extending crank J operatively connected in this instance by gearing at the front end of the machine to drive the 'rotary drill bit K carried in the spindle L. The pinion E on the forward end of the crank J meshes with Y the gear O on the spindle L as shown for driving purposes.

The supply of pressure fluid to the ma- Achine in accordance with this invention is controlled by a rotatable handle sleeve P connected to actuate the throttle valve P and also the reversing valve Q both of which are located inside the handle body R, which is connected to the case A as by means of a threaded sleeve S. i

The reversing valve Q, as shown is provided with the ports S and T and passages U for pressure fluid whereby the passages V and W in the case A may alternately be made supply or exhaust passages, according to the direction in which the' motor is intended to rotate the crank J.

In the position of the ports shown in Figure 1, the throttle valve P is closed but when the valve is opened, as in Figure 2, the pressure fluid supply enters the inlet X at the outer end of the handle body and passes to the machine through the passage V, while the exhaust passes out through the passage lW to the port Y and thence to atmosphere. When the valve Q is reversed, the passage W becomes the supply port for the machine and the exhaust passes out glrirough thek passage V to the exhaust port The machine is also provided with a supplemental or auxiliary constantly o en exhaust port a except as controlled y the cooperating portion of the crank J which acts as a rotary valve but asthis auxiliary exhaust'port forms no part of the resent invention, its function will not be urther described, said invention and the mode ot operation the rotary valve having been fully described in my said copending application Serial No. 29,061, tiled May 9, 1925. rlhe case rl is formed with the reduced bore l) in which is located the stationary valve bushing c having` suitable ports and passages controlled by cooperating ports in the rotation crank .l tor distributing the pressure fluid to and .trom the cylinder both on direct and reverse rotation of the motor.

The throttle valve P is pressed to its seat by gmeans of a valve spring` cl and an additional lighter conically wound springc is located around the valve stem f and between the ,throttle valve P and the sholuder e on the handle body R beneath the reversing valve Q. rl`he valve .stem f extends into a socket g in the reversing valve vand has a slight play therein. The reversing` valve is bodily movable longitudinally in the handle body R and is provided wi-th a pin and roller 7a extending' through a cam slot for-med in the wall of the handle body R. The head 7c ot the pin is located in the longitudinal slot 0 in the wall ot the handle sleeve l?. rhe cam slot in the handle body R is of angular shape and substantially symmetrical so that as the handle sleeve is turned or rotated in one direction or the other, the longitudinal slot o forces the pin 7LA along one inclined side or the other of the cam slot j thus moving the reversing` valve Q longitudinally and pushing the throttle valve P longitudinally to Open the valve. Upon releasing the handle sleeve, the pin c automatically returns to the apex ot' the cam slot y' thus returning vthe throttle valve P to neutral or closed position. If desired, means may be provided as for instance Ia 'notch at the top of the cam slot to hold the throttle open and to prevent the automatic return to neutral or closed position.

The cam slot j is also preferably deepened at the bottom as shown to produce a distinct or semi-positive neutral position. lllhen the handle sleeve l) is rotated, the pin 7L must first litt out ot the depression at bottom of cam slot j bringing the reversing valve Q, in operative contact with the end or" poppet valve stem f so that further movement then lifts the poppet valve P. A further object of the lost motion connection between the poppet valve stem f and reversing valve Q is to permit the reversing ports to be appreciablv opened before the, motive fluid is admitted to the motor.

The depth of the depression in the bottom of the cam slot y' isv such that an appreciable etlort is required to turn the throttle from this neutral position. In operation, the throttle is tirst turned sufficiently to lift the cam roller 7L out ot' this depression before the reversing valve moves endwise a suthcient distance to litt the poppct valve P.

claim:

l. ln a fluid actuated rotary tool, the combination ot a case and motor, a handle body, a rotatable handle sleeve, a springpressed throttle valve and a reversing,- valve in the -handle body, operative connections between the sleeve and the reversing valve, means for actuating the throttle valve by movement ciE the reversing valve including means for automatically returning the throttle valve to neutral or closed position when the handle sleeve is released after .rotation on either direction from neutral position.

2. In a fluid actuated rotary tool, the combination ot a case and motor, a handle body, a rotatable handle sleeve, a spring` pressed throttle valve and a. reversing valve in the handle body, operative connections between the sleeve and the reversing valvehand a cam for causing longitudinal movement oi the reversing valve as it is rotated, and thereby actuating` the throttle valve.

In a tluid actuated rotary tool, the combination of a case and motor, a handle body, a rotatable handle sleeve, a spring pressed throttle valve and a reversing valve in the handle body, operative connections between the sleeve and the reversing valve, a cam for causing longitudinal movement ot' the reversing' valve as it is rotated, and thereby actuating the throttle valve, said cam having oppositely inclined surfaces for causing` the throttle valve to return to neutral position when the handle sleeve is released after rotation in either direction from neutral position.

4:. In a Huid actuated rotary tool, the combination of a case and motor, a handle body, a rotatable handle sleeve, a spring pressed throttle valve and a reversingvalve in the handlebody, means for actuating the throttle valve by movement of the reversing valve, a V-shaped cam in the handle body, a pin carried by the reversing valve and forming a follower for the cam, and a slot in the handle sleeve into which the pin extends, whereby rotation of the handle sleeve in either direction from neutral position operates both valves and the throttle valve is automatically returned to neutral or closed position upon release of the handle sleeve after such rotation.

5. In a iiuid ac aiated rot-ary tool, the combination of a case and motor, aV handle body, a rotatable handle sleeve, a spring` pressed throttle valve and reversing valve in the handle body, a lost motion connection for actuating the throttle valve by movement of the reversing valve, a cam slot in the handle body having a depression at its bottom, a follower carried by the reversing valve and adapted to seat in the depression at the bottom of the cam slot when the reversing valve is in neutral position, and a slot in the handle sleeve cooperating with the said follower, whereby the rotation of the handle sleeve in either direction from neutral position partially opens the reversing valve be- 5 fore operating the throttle valve.

throttle valve and a reversing valve in the' 10 handle body, a lost motion connection for actuating the throttle valve by movement of the reversing valve, and means for maintaining the reversing valve in neutral position.y whereby rotation of the handle sleeve in either direction from neutral position partially opens the reversing valve before operating the throttle valve.

In testimony whereof, I have signed this specieation. Y FRANCIS A. JIMERSON.

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