US1150641A - Throttle-handle for pneumatic tools. - Google Patents

Description

STATES "1'nrnn'i-A oFFIoE. I'

LEWIS n. sMrrn, 0E oLEA'N, NEW Yonx, AssIeNon or ONE-THIRD -T'o THOMAS. J.

Brees AAND` ONE-THIRD rro JUEIUS '.r. PLOESSEL, Eo'rH or OLE-AN, NEW YORK.

THEo'rrLE-:EANDLE Eon PNEMATIG Toons.' y

yTo allwhom tm/ay concern.' l,

vBe it known that I, LEWIS H. SMITH, a

citizen of the United States, residing at useful Improvements in ThrottleHandles for Pneumatic Tools, of which the following is a specification.- y

This invention relates to the throttle handles or valves employedl for controlling as pneumatic drills, and more particularly to handles .of this kind in which the valve 'is operated by a rotary sleeve `having Van 0b.

lique slot which Vreceivesa pin connected with the valve.v

' 'In throttle handles as hitherto constructed when the valve is closed-and the tool temf4 porarily laid aside, the rotary sleeve is liable -to become displacedaccidentally by ]ars r-or shocks,suii cientlyto open theA valve andactuate the tool, and when this occurs, the tool Vbeing uncontrolled, i'smoved in various directions by its vibrations, sometimes coming in contact with attendants and inflicting se`V rious injury.

The object of my invention is the provision of a simple, reliable and inexpensive' lock for the rotary4 sleeve or equivalent valve-operating member of the throttle handle, which shall prevent such accidental displacement of the sleeve and whichvat the same time permits ready unlocking thereof.

n the accompanying drawings, Figure 1 is a side elevation of the throttle-handle, showing the valve-operating sleeve locked.

Fig. 2 is a similar view, showing said sleeve f unlocked. Fig. 3 is alongitudinal section' of the device, showing the" throttle valve open. Fig. 4 is a similar section, showing said valve closed. Figs. 5 and 6 are transverse sections on `the 'correspondingly numbered lines inFig. 3. l ,Y

Similar characters of referenceindicate corresponding parts throughout the several views.' l

1 indicates the tubular shell or casing of Vthe device having its Vfront end 2 threaded to screw into a corresponding opening or.

socket of the-'drill-casing'or1other tool, not shown in thedrawings. Screwed into the opposite end Yof theshell is a nipple 3 adapt- `ing Ithrottle valve 9 coperates'.

t ample shown in the drawings, the stem 10 of this valve is cylindrical 4and slides lengththe supply of the motive fluid to portable vpneumatic tools or motors, such for example,

` close the vthrottle-valve.

Vthe sleeve is mounted to slide lengthwise as u well as rotate on the casing- 1, and a spring l 21 is arranged to shift the sleeve lengthwise Patented Aug. 17, 1915.

y Application IediJ'uIy 30, 1914 Serial No. 854,113. i

ed to receive a short pipe 41 upon which is secured the usual iuid-supply-hose 5 by a suitable clamp 6.I .a Y

Rigldly secured within theshell isa longiable valve-seat 8 with -which 'a correspond- In theexln the construction illustrated in the drawings, the stem 1s for this purpose bored in its frontportiom as shown at 11, and provided 1n"oppos1te sides of its rear portion with `hereinafter more fully described. This spring bears at its front end against the.

valve and atv its rear end against`an internal shoulder 111l of the nipple' 3.

Surrounding the central portion 4of the v tudinal guide tube. or bushing 7 .provided at lts rear end with a conical or other suit-` A'longitudinal grooves 12 which communicate i i casing` 1 is the valve-operating sleeve 15,

preferably knurled or roughened to afford a irm grip and provided with an oblique slot 16 which receives the head of a shifting screw or pin 17 projecting from the valvestem 10. This pin "also passes through longitudinal slots 18 and 19 formed respectively in the bushing 7 and casing 1..' The voblique slot 16 is provided with a locking notch or recess 20, preferably located in its front edge, at or near its frontv orleading end, andfadapted to interlock with the pin 17 when the sleeve is turned forwardly to For this purpose,

toward the rear end of the 'handle to cause far enough to close the valve. 'This `spring surrounds 'the easing and is housed by a coliar 22 which overlaps thefront end of the sleeve and is provided at its front end with internal ia'nge 23 ,whichabuts against a shoulder 24: of the casing, the spring being 'interposed between said collar-flange and the front end of the sleeve 15.

Surroundingr the vcasing and overlapplng the rear end of the sleeve is a sumlar collar 25 provided at its. rear endl with an'internal' end of the casing.

- ,The operation of the device is .as follows:

I When the valve is closed,- as shown in Fig. 4,

' strikes said pin, Y .initial or sliding movement of the sleeve,

the front spring 21 is partly compressed and the valve-shifting pin 17 occupies the locksV ing notch 2O o'f the sleeve 15, the notch and pin being held in this interlocked position by the pressure ofsaid spring against the front end of the sleeve. he sleeve is thus locked against accidental rotation and the valve is reliably held closed, avoiding all liability of injury to attendants, or others, when the tool is laid down .with the fluidpressure turned on. To open the valve, the operator grasps the sleeve 15 and pushes it toward the frontend ofr the handle tollnlock its notchf20from the pin 17 and then turns Athe sleeve forwardly or in the direction of the arrow in Fig. 1, the valve being fully opened when the rear end ofthe slot as-shown in Fig. 2. By this the front spring 21 is fully compressed, as shown in Fig. 3, and actspractically as a rigid abutment for the front end of the v, sleeve. .In order to effect the necessary longltudinal movement of the valve to open it by turning the obliquely-slotted sleeve, the latter must beheld from sliding in both directions during its rotatiom It is held against forward displacementby the com pressed spring 21, and against rearward displacement both. by the conical or rear spring and the fluid pressure when turned on, and by said rear spring alone when the ressure is turned ofi", this spring and the Ifluid pressure acting upon the sleeve through against said Vwhich resist the purpose,

"d rotation nof the sleeve,

the valve, its stem 10 and the pin 17. other words,

the valvemust be opened spring and Aiiuicl pressures tendency of the front spring to slide thefsleeve rearwardly. For this the front spring is lighter or of less resistance than the 'rear spring, so as to be overpowered by it, so long as the valve remains fully or partly open. When however, the valve closes by the backward the rear spring and the iluld pressure no longer oppose the front spring and the latter reacts and slides the sleeve rearwardly to interlock its notch with the pin 17, as above described.

, In the proper use of the throttle-handle ,i

when it 1s desired toturn oli the pressure,

the valve 9 is closed' by turning the sleeve I backward before closing the usual stop cock (not shown).of the main or air supply line,

in order lthat thepressure against the valve will preventrearward .displacement of the sleeve, as' hereinbefore described. But, at-

ten'dants sometimes carelessly close said stop vcock before closing the throttle-valve 9, thus turning off the air-pressure from said valve, and in the absence of the stiff rear spring there would be no resistance to the backward displacement of the sleeve and the light front spring would therefore slide the sleeve backward, opening .the valve instead of handle,

closing it, and holding it open. To guard against this improper'action of the throttlethe rear or valve-closing spring is employed, which'acts as a substitute for the v Huid-pressure under these conditions and resists such longitudinal displacement of impossible for the operator to close the valve withoutf at the same time locking it in that position, thus eectually guarding against. accidents of the character hereinbefore mentioned. oWhile furnishing this safe-guard, the improvement is exceedingly simple and does not materially increase the cost of the device.

I claim as my invention:

1. Al throttle-handle for fluid-pressure tools, comprising a casing, a throttle-valve therein, a rotary sleeve mounted on said casing-and capable ofsliding longitudinally thereon, said sleeve having means `for operating said valve'by rotatlon of the sleeve,

and means for `automatically locking the y sleeve against rotation ment thereof.

2. A throttle-handle for fluid-pressure tools, comprising -a casing,

by longitudinal movesleeve slidable longitudina y on said casingy and having an oblique slot which engages tools, comprising a casing, a throttle-valve therein having a lshifting pin, a sleeve slot having a locking recess a throttle-valve v 'therein having a shifting in, and a rotary mounted` on said casing and having an obli ue slot which engages said pin, 'said slot aving a lateral locking recess adaptedl to interlockwith said pin in the closed position of. the valve, and a spring arranged to shi-ftsaid sleeve lengthwise to engage its locking recess with said pin. Y

4. A throttle-handle for fluid-pressure tools, comprising a casing, a throttle-valve therein having a shifting pinya 'sleeve mounted ony said casing, and having anxoblique slot which engages said pin, said slot having a lateral `locking recess adapted to interlock with said pin, a spring arranged toshift said sleeve lengthwise in the proper direction to engage its locking recess with r f said pin, anda second spring of greater re-l sistance than the` first-named spring arranged to oppose longitudinal movement of the sleeve in the opposite direction.

,5, A throttle-handle for uid-.pressure tools, comprising a casing, a *throttle-valve therein having a shifting pin,. a sleeve mounted on said casing and having anoblique slot which engages said-pin, said Y slot having alateral recess adapted to interlock with said pin, a spring arrangedtoshit said sleeve lengthwise Iin the proper direction to engage its locking recess with said pin, anda second spring' of greater .resistance thanthe first-named spring bearing p against said valve andacting on the sleeve 1n opposition to said first-named spring.,

6. A throttle-handle for uidpressure tools, comprisinggvacasing,` a throttle-valve therein,` a movable sleeve mounted on said casing and operatively connected with said valve, and collars *surrounding the casing and overlapping the ends of the sleeve.

7 A throttle handle for` fluide pressure tools, comprising -a casing, al throttle-valve ltherein having a shifting pin, Ia rotary sleeve slidable longitudinally on the casing and having an oblique slot which engages said pin,

said slot having a lateral locking recess ad'apted to interlock with said pin bythe longitudinal movement'of i the sleeve, a collar, surroundingthe casing and"overlapping the front end of the sleeve, and a spring housed within said collar and bearingagainst the adjacent end of the sleeve.

Witness 4my hand this 27th day of- July,

Images