US1594964A - Reversible throttle handle - Google Patents

Description

Aug. 3 1926-.

F. A. JIMERSON REVERSIBLE THROTTLE HANDLE l Filed August '7 1925 Patented Ang, 3,1926.

UNITED STATFQ MEN? g aries.

FRANCIS A. JIMERSON, OF ATHENS, PENNSYLVANIA., ASSIGNOR 'IO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, .A CORPORATION OF NEVI JlEI'tEY.v

REVERSLBLE THROTTLE HANDLE.

Application led .August 7, 1925.

This invention relates to fluid actuated rotary tools, such as rotary drills and the like, but more particularly to a reversible throttle handle for machines of this type.

Such rotary tools run at comparatively high speed, and a good example of a tool of the general type to which the reversible throttle handle, forming the subject matter of this invention relates. is disclosed in my copending application Serial No. 567,887, filed, June 13, 1922, for fluid actuated rotary tool showing the general organization of the parts of the tool itself.

In such high speed tools especially the manipulation of the throttle should be posi tive and certain and the objects of this invention are to provide such certainty of operation and at the same time, if desired, insure the automatic return of the valve to neutral position when the valve is released. In some respects the invention is a modification and improvement of the machine disclosed in my copending application Serial No. 29,060, filed, May 9, 1925.

Further objects will hereinafter appear and the invention is shown in one of its preferred forms in the accompanying drawings in which,

Figure l is a longitudinal sectional elevation of a rotary drill having the invention applied thereto, with the throttle valve in the handle closed,

Figure 2 is an enlarged detail transverse sectional view on the line 2-2 of Figure l looking in the direction of the arrows, with the throttle valve closed,

Figure 3 is an enlarged detail view partly in longitudinal section of a portion of the throttle handle in a plane at right angles to the plane of the section of Figure l, with the throttle valve open,

Figure 4 is a detail transverse sectional view taken on the line l-'e of Figure l looking in the direction of the. arrows,

Figure 5 is a view of a portion of Figure 3 showing the valve cam in neutral position so that the throttle valve is closed as in Figure l, and

Figure 6 is -anenlarged detail transverse sectional view partly broken away and taken through the reversing valve of the machine on the line 6 6 of Figure l, looking` in the direction of the arrows, with the reversing valve open.

In the drawings, only so much of the de- Serial No. 48,869.

tails of the rotary drill are shown as vill serve to disclose the present invention relating to the reversible throttle handle. rl`he case, or cylinder casing A, having the reI movable crank case cover B and the removable gear case or front head C together forni the trarne of the machine inclosing and supporting the operating part-sfor imparting rotation to a suitable tool, which be carried in the socket D provided in the drill spindle E.

rlthe drill is provided with the throttle handle body F and the opposite handle G, and the pressure fluid is supplied to the machine through the handle body F and controlled by the throttle valve L manipulated hy improved devices in accordance with this invention, so that the valve, if desired, may always be made to return to neutral position when released. Otherwise the valve is both opened and closed by hand.

The crank shaft H is mounted in the ball bearings J in the case A beneath the crank cover B and adapted to be actuated by a fluid actuated motor of any suitable type, as for instance, a multi-cylinder motor having V-type arrangement of cylinders, two of the cylinders K being indicated in Figure l. at one side of the machine, and 'at an angle to the aXis, the remaining` pair of cylinders not being shown. rlhe pistons O recipro eating in the cylindersare connected by connectingrods P to the crank shaft and the distribution of motive liuid to the cylinders, in this instance, is controlled by a rotary valve Q actuated by suitable gearing from the cra-nk shaft.` Suitable ports Q in the casing for each cylinder are controlled by the appropriate ports and passages in the revolving` valve Q, but the details of the passages leading to the cylinders and the details of the cycle of operations in admitting and exhausting pressure fluid to and from the cylinders are not further illustrated as they form no part of the present inventioin The crank shaft H is provided with a pinion R meshing with the gear S on the spindle' E and another gear T connected to a gear S drives the valve Q through the agency'of the pinion U, so that in the present instance the valve is rotated at half the speed of the crank.

In order to feed the working tool forward, an internal feed'screw V is mounted in the case and is provided with an extension ,W

:IB Leonesa upon which is mounted a bearing X. A by turningthe handle sleeve d clockwise as =i`eed screw Y having a center Z and a hand Wheel a, as usual, completes these parts o1".

the machine.

The machine is preferably provided with a reversing` valve o mounted in the sleeve c in the case A in a convenient position .to be operatively connected to be actuated by the reversible throttle handle sleeve. (Z rotatable back and forth to a limited degree on the outside of the handle body F, so that as the throttle valve L opens, the reversing valve o is rotated in one direction or the olier 'trom closed position to cause direct or reverse rotation oin the motor.

A heus L e embracing the handle body F andcovering the valve l) and the valve stem y, is secured to the case A by means ot the screws g, and protects 'the operative parts beneath it. ln vhis instance the housing also acts as a abutment tor holding` thenvalve against endivise movement in one direction.-v A toothed sector g on the valve stem lengages a toothed .sector g2 of a handle cam IL. The cai/n 7L is in the toi'in ot a sleeve movable on the body ll" and has a slot in the outer flange j engaged by the tongue /c on the handle sleeve (l, so that rotation et the sleeve rotates the valve il stop pin `0 conveniently located in the case A is pressed by a spring,` p and engages one of thedepressions r in the inner flange 1" ot the handle cam 7L to hold the valve in one or another of the valve positions, either closed or open.A The depressions 7 and the stop pin- 0 may be omitted, it desired, thus permittingthe valve L to be closed automatically by the action ot' the spring t upon release of the handle sleeve CZ.

rlhe throttle valve L is movable longitudinally in the handlefbody F and normally forced to `its closed position on the seat s by suitable coiled spring t. A slot u at the inner end ot' the valve stem o engages the vcross pin w movable in the slot c@ in the handle body and having` rollers y at each end cooperating With and forming the fol,- lovvers ot the handle cam L. This cam 7L hasthe `angular or if-shaped cam surfaces e-'softhat when the-rollers y lie at the apen or-bottomot the l! -shaped cam opening, the parts are all in neutral position and both the throttle .valve L and the reversing valve Z) areclosed as shown in Figure l ofthe draw-ing. Rotation ot the handle sleeve cl in oner direction or the other causes the roll elle P1/ to ride up or outwardly on the cam surfaces .e to open the throttle valve, which may be Aautomatically returned to closed or neutra-l position by the pressure ot the spring t when the handle sleeve (Z is `released.

ln the operation of the device, let itbe assumed that the valves L and b are both closed as shown in Figure l and that pressure 'fluid isto be admitted to the machine Figure l is viewed from the lett, to the position ot' the parts in Figure 3. In such case the cam surfaces z Will have moved the throttle valve Lto open position andjpressure fluid passes through the open portion of the handle body F and passages 2 in the body to the chamber 3 at the inner end ot' the hany dle body, and Jtroni thence as indicated in higure G, through passage 6 in the case, to and through thebushing c and reversing` valve Z; to the passage 6 in the case, and through the distributing valve Q. to the motor cylinders. he exhaust from the cylinders passes out troni the distributingvalve Q to the passage 7 in the case and 'troni thence through the reversing valve b to the atmospheric exhaust port S. Upon reversing the movementot the handle sleeve (l, which muet lirst pass through neutral position, the throttle L is closed and then opened again and reversing valve b is reversed, in which case the 'functions of the passages 6a and 7 in the case is reversed, and the supply ot presre fluid passes to the distributing` valve and motor cylinders through the passage 7, While the passage 6a becomes anvezthaust passage.

l claim:

l. ln a luid actuated rota-ry biiwtion vith a case and motor, of a handley bcc a rotatable handle sleeve, a throttle` valve in the handle body, a housing secured to the casing and encircling thehandle body, a rotatable reversing` valve adjacent the handle body, a stein on said reversing valve and abuting the housing to hold the valve against endivise movement in one direction, a handle cam rotatable on toe valve body, and operative connections in the housing for transmitting rotary movement otA lthe handle cam to the reversing valve.

2. In a fluid actuated rotary drill, the combination with a case and motor, ot a handlei body, a .rotatablefvhandle sleeve, a throttle valve in thehandlebody,a housing secured tothe casingand encircling the handle body, a rotatable reversing valve adjacent the handle body, astem on said-reversing valve and abutting the housing to hold the valve against endwise `movement in one direction, a handle cani rotatable on the valve body and.` extending into the housing, a toothed sector integral with the handle'cam enclosed by the housing, and a toothed sector on the stem ot the valve to engage the toothed sector on the handle cam: tor transmitting rotary movement ot' the handle sleeve to the reversingvalve.

ln testimony -Whereot l have signed' this specilication.

FRANCIS at. ,EMERSON drill, they com-

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