US984424A - Throttling device for pneumatic tools or the like. - Google Patents

Description

G. H. GILMAN. DEVICE-FOR PNEUMATIG TOOLS'OR THE LIKE.

THROTTLING APPLICATION ILED FEB. 2,'1907.

Patented Feb. 14, 1911.

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`UNITED sTATEs PATENT oEEIoE.

GEORGE H. GILMAN, OF CLAREMONT, NEINl HAMPSHIRE, .ASSIGNOLB/` TO SULLIVAN MACHINERY COMPANY, OE CLABEMONT. NEW HAMPSHIRE, A CORPORATION 0F MAINE.

Specification of Letters Patent.

Patented Feb. 14, 1911.

Application filed February 2, '1907. Serial No. 355,493.

'loaZZ whom-fit mcwoncera:

Be it known that-I, GEORGE a citizen of the United States, residin at Claremont, in the county of Sullivan, tate of New Hampshire, have invented an Improvement in Throttling Devices for Pneu) matic Tools or the Like, of which the fol\ lowing description, in connection With the accompanying drawings, is a specication, like letters on the drawings representing like parts.

My invention relates to throttling devices, being more particularly concerned with the throttle control of the tool operated by com pressed air or other pressure fluid, and particularly Where such tools are fed toward or H. GrcMAN,

held to the Work by means Vof a pressure actuated feeding device.

'ftaken inconnect-ion withthe accompanying illustration of one Vspecific embodiment thereof while its scope will be more particularly pointedout in the appended claims.

In the drawingsz--Figure 1 represents in fragmentary sectional central elevation a tool appliance to which is applied one, form of my invention; Fig. 2 represents inside 'elevation ona smaller scale the toolappli- ,ance shown in Fig. l; Figs, 4 and 5 show a reproduction of a fragmentary portion of the sectional view in Fig. 1, the throttle valve, however, being shown in diderent posil-ions. Fig. 6. is a section on the line 6-6 mer drlll of ordinary end usual construc- The details of the drill are not shown, it being suiicient to say that in the ap aratus described the cutting tool 2 is he d in a suitablechuck at the end ofthe drill tool reoccurring blows by a reciprocatory iston (not shown within thedrill tool cylinder,

is well understood by those shown pressure iui feeding means lfor holding the cutting .toolu against its work,-

. of a cylinder 3 having one end iiXedly attached to the head block 4 of the drill tool and the opposite end provided with apacked aperture through-which projects the piston ro'd 5, carrying at its end the pointed foot 6 adapted to be braced against a Vertical side wall of a mine or quarry, in which the apparatus is used.' Vithin the cylinder the piston rod is secured to the'piston 7, so that when air is admitted to the cylinder between the piston and the forward cylinder head or that next adjacent the drilltool, the cylinder with its attached head is pressed for* wardly in much the same fashion as Vif the hammer drill were pressed forward against the work by the hand of the operator.

For controlling the admission of pressure fluidl not only to the feeding cylinder but also to the-tool itself, there is provided a rotatable sleeve 8 which is mounted upon a reduced'portion 9 of the drill tool head 4. Into the end of the reduced head portion 9 is threadedthe end 'of the feedingcylinder 3, so that the latter and the cylinder head block 10, which closes the end of the cylinder, are seated against and xedly held by the walls the drill head;

To retain. the sleeve 8 longitudinally in position there is proyided the split clamping collar 1I, which 1s clamped about `the necked-d`own endA of the reduced head portion 9. In order'that this clamp'may' also assist in securing the cylinder end more firmly, the interiorly threaded necked-down mort-ion of the head 4portion is preferably provided with two or more longitudinal slits (not shown) so that when the clampf ing collarlis set u tight it also clamps the head and the cylinder into Iirm threaded engagement with Veach other.

Arranged transversely Within the reduced portion of the -drill head is provided the throttle valve 12,'hereinshown of the piston type, working in a cylindrica1pbcket 'or recess 13 and controlled by rotative movement of the sleeve 8. This valve is provided with an inner head 14, an outer head 15V and a.

reduced connecting portion. The outer head 15 contacts with the'seat (1r/bottom Vof an annular groove or recess, such groove or recess, however, being eccentrically formed (sec Fig. G) in the sleeve so as to provide at its bottom face a cam Vsurface which engages the outer projecting head of the valve." Pressure fluid is supplied jointly from y any suitable souice not shown) to the feeding cylinder and the tool by the pipe 17, which latter has a threaded nipple connected to the admission opening 18 at the side of the cylinder near its att-achment to the drill tool. Communicating with the admission opening 18 is the main supply port 19, which extends longitudinally forward through the cylinder headblock 10 and the tool head block to the valve pocket 13, access of the pressure fluid from this port to the valve pocket being controlled by the inner head 14 of the valve, which 1nay be moved to open' the exit wholly or partially or to completely close the same. Opening out of the valve pocket are two passages 20 and 21, the former being arranged parallel with the admission port 19 and leading back to the pressure space 22 within the feeding cylinder. Thel second and shorter passage A2l leads from the valve pocket in the opposite direction to the pressure space 23 of the drill tool, whence pressure. is supplied to the tool cylinder through the control of a suitable diderential or other' valve (not shown) of any usual -or suitable construction. l

To cause the valve to seat normallyr out against the bottom of the eccentric sleeve groove there is provided means for maintaining const-ant pressure upon the inner end ofthe valveY While this might be effected by mechanical means, such as a spring, for simplicity and greater effectiveness I provide a pressure duct 24 connecting the pressure fiuidsupply port 19 and the enlarged bottom 25 of the valve pocket. Pressure iiui acting against theenlarged inner head of the valve presses it constantly Ioutward 'against the cam surface -of\ the sleeve groove.

When the apparatus is in disuse the sleeve vTis turned to a position which places the .valve as shown in Fig. 1. lUnder these conditions the cylinder passage 20 is uncovered and placed in communication with the upper part of the valve pocket. The outer end of the valve pocket is provided with a notch or recess y26 and this connects the upper end of the valve pocket with the eccentric groove or recess, which is made somewhat Wider than the diameter of the valve head 15 and is also vented through one or more apertures 27 leading to the eX- terior', so that with the valve as shown in Fig. v1 lthe cylinder space 22 is connected directly to the atmosphere and the pressure4 fluid is exhausted. Under these conditions also, the inner' valve head 14 closes the passages 19' and. 21 cutting oit the-supply of pressjure fluid to the drill tool. If the sleeve is then turned from the position shown in Figs. 1 and G, the increasing shallowness of. the cam groove forces the valve inwardly. This rst closes thejeXhaustfrom the feeding cylinder by covering the notch 26 with -t-he oiter head of the throttle valve and then causes the uncovering of the admission port 19, so thatthe latter is placed in communication with the cylinder port 20, admitting feeding pressure to the cylinder space 22. The valve is then in some such position as shown in Fig. 3, the drill port 21 still. being closed. With the drill tool pressed against the work by the pressure fluid in' the feeding cylinder, if the sleeve isaturned stilll farther inthe-same direction the valve will be forced to'some such position as shown in Fig. '-1 where a restricted admission of pressure fluid takes place to the drill tool through the'port Further movement of the sleeve forces the valve toward the position shown in Fig. 5, where full admission to the drill tool takes place, the pres-` surefluid, as before freely entering the. cylinder port 20 to keep the tool pressed against 'there is provided a single controlling device which 'acts to control both the feeding pressure Huid and the toolV pressure fluid, this being accomplished in the present instance by successive steps, so'that before -the tool pressure fluid is applied feeding pressure fluid for holding ,the tool against, the work In order that the sleeve may have a delie nite range of movement and be turned with certainty from a fixed initial position to a definite final position there is provided a' fixed stop pin 28 projecting longitudinally and rearwardly from the enlarged portion 4f of the drill head and working (see Fig. 7) within a segmental groove or recess ,29 in the side of the sleeve. When the sleeve is turned to one limit of itsmovement, corresponding to the valve position in Fig. 1

the pin is caused lto abut against one end the'groove and when turned to the opposite limit of movement and in the direction of the arrow in Fig. 7, corresponding to position shown in Fig.- 5, the pin is caused to abut against theopposite end of the Groove.

, In order to assist -the retention of the sleeve in bothl the extreme and intermediate positions assigned, and to' assist the operator in finding, by the sensation of touch alone,

those' intermediate positions which practice may show are the more oftenrequired, I have" provided a positioning device for the sleeve, comprising a pin 30 seated in a long-. gitudinal pocket in the sleeve,- and having its beveled head pressed outwardly by the spring 31, so as to seat in any one of a series ido of depressions formed inthe opposing face of the head block, the latter being brought into successive alinenient with the pin as the lthe grasp of the operators hand.

While the' piston may be ot any desired construction, in order to better prevent lealtage troni the pressure cylinder, the piston, i'n the apparatus shown, has a reduced end 32 (Fig. l.) on` which there is provided a sleeve 33.4 The inner endo said sleeve has formed thereon a shoulder adapted to re ceive a packing ring 34, which latter, there tore, rests between the shoulder and theen largedqportion of the piston 7. Beyond the sleeve 33 there is also provided another shouldered sleeve carrying-a second packing ring 36. On an outer shoulder of the sleeve 35 is arranged a split expanding ring 37 and this, together With the sleeve 35, is retained in place hy the feed -pistonnut 38 secured to the threaded end of the reduced piston por tion The reduced piston portion is pro vided with an axial passage 39 extending .being extended part Way into the same and opening into the space 22,- radial passages ll() alining withv the piston ring 234i aiidvother radial passages 41 alinin with the piston ring 36 rom the asia-l passage through the piston and the respective sleeves,

so as to admit pressure fluid constantly to i `the inside of the piston rings. therefore, as mitted to expand the rines and better to prevent 'lealt- So long, feeding pressure tluid is adthepressure space, it also acts to age. A tapered plug 42 is threaded into the endfof said piston and the latter is split at 43,- so that the plug expands the piston end Within the threaded nut 38 and prevents any loosening of the parts. rlt`he plug is provided-With an axial passage 4A, which places that piston passage 39i1i communication. With the pressure space 22. The inner end of the yfeedmg cylinder is enlarged slightly at llo,

Where its Walls engage the spring 37 in the contracted condition ot the piston, so that the expansion of the ring tends to retain the piston normally in' that position,l rendering lit more, convenient for purposes of trans .porta/tion or handling. The enlarged portiono the cylinder, however, is beveled at i `4:6 andi theend of the rin is also rounded at 47., vso that pressure fluid Whenadmitted will readily force .the piston outward by forcing the ring to Contact and ride over-'thc tions may be made therein without departing from the spirit of my invention.

Claims." i

l. The combinationwith a pressure fluid tool of pressure duid feeding means there tor, a movable sleeve and means operated hy the movement of said sleeve tor controlling the admission of pressure fluid to said tool and to said feeding means.

2. rllhe combination with a pressure tluid tool ol pressure fluid feeding means there tor, a rotatable sleeve and means operated by the rotated movement ot said sleeve, for controlling pressuremtluid admission to said' tool and to said feeding nieans.`

3. The combination with a pressure fluid tool ot' pressurefluid feeding means alined therewith and sleeve controlled throttling means both, tor the tool and'lnthe feeding mean.; and located between the same.

4.. The combination `vvithsa pressure duid tool of pressure tl 'd feeding means thereot parts shown, but that extensive'modilicaftor, a feeding cylint er having itshead end l for the reception of the valve and other parte, the said feeding cylinder having head, feeding piston in said feed cylinder, a piston-rod connected -thereto and projecting through" the open opposite end of said cylinder, a throttle valve and a sleeve for duced portion of said drill tool-head. q

6. The-combination with fluid pressure tool, of a feeding cylinder rigidly securedto ably mounted Withinsaidcylinder, a piston rod connected thereto and projecting der, a valve `and-a valve controlling sleeve for controlling the pressure duid supply to sail feeding cylinder, said l'sleeve being mounted in tool. y

7. In an apparatus of the'class a described, pressure tluld tool having a toolcylinder,

" nested at one end with the tool cylinder' and,

latter containing suitable passages or spaces a reduced portion of saidfdrill a feeding, cylinder, a drill tool-head conthreaded connection with said drill toolcont-rolling said valve mounted upon a re- Y.

the end of said'tool, a feeding piston slid.- l

through the opposite open end of said cylinf in@ the ,other with the feeding cylinder', a sleeve encircling a reduced portion of the drill tool-head near the feeding cylinder and a valve transversely arranged in said drill tool-head and controlling a pressure Huid passage leading to said feed cylinder, said valve being controlled by said encircling sleeve. l 1

S.' The combination with a pressure lluid tool of pressure fluid feeding meansr therefor, and a controlling device for said tool and said feeding means comprising a member having pressure fluid supply passages leading, respectively, to said tool and said feeding means, a sleeve mounted for turning movement on said member and a valve arranged transversely in said member to control the pressure supply passage and adapted to be actuated by movement of the sleeve.

9. The combination with a pressure fluid tool of pressure fluid feeding means therefor, the same comprising a feeding cylinder and a relatively `movable feeding piston, the oneattached to the tool and the other adapted to beheld by a suitable support, amovable sleeve, and means operated by the movement of said sleeve for controlling the admission of pressure -uid to the tool .and to the feeding means. Y

10. The combination with a pressure fluid tool of pressure lluid feeding means 7dierefor,.the same comprising a feeding cylinder and a relatively movable feedingqbpiston. one of which is attached to said tool and alined therewith, whereby the apparatus is given a column -lilre formation, a movable sleeve mounted upon said column-like formation. and means operated by the movement of said sleeve for controlling the admission of pressure duid to the tool and 'to said'feeding means.

11. The combination with a pressure fluid tool of pressure lluid feeding means therefor, and a rotatable sleeve throttle for the tool and the feeding means located between the tool and the feeding means.

12. The combination with a pressure fluid tool of pressure fluid feeding means therefor, a rotatable sleeve., means operatedl by movement of said sleeve for controlling the admission of pressure fluid to the tool and to the feeding means, and positioning means for said sleeve.

13. The combination with a pressure fluid tool of pressure fluid feeding means therefor, fluid pressure supply passages leading to said tool and to said feeding means, a

vvalve controlling the same, a rotatable sleeve for operating said valve and positioning means for said .sleeve comprising a springpressed member carried by said sleeve and adapted to engage with one or more depres-y sions in an adjacent-.zuperating member.

14. The combination with a pressure fluid tool of pressure fluid feedingzmeans therefor, a rotatable sleeve, means controlled by.

the movement of said sleeve for admitting pressure fluid to said tool and to said feeding means, a fixed member adjacent the sleeve, a plurality of depressions in said fixed member', a pocket in said sleeve, and a spring-pressed pin in said pocket adapted' to engage with depressions on rotation of said sleeve.

15. The combination with a pressure fluid tool of pressure fluid feeding means substantially alined'therewith, the same comprising a feeding cylinder and a. feeding piston, one of which is attached to the head of said tool, suitable pressure fluid passages in the tool head, a throttle valve also in said tool head controlling admission of pressure fluid to the tool and to the feeding cylinder, and a sleeve for controlling said throttle valve movably mounted upon said tool head.

16. The combination with an apparatushaving a pressure fluid tool of pressure fluid feeding means therefor, a valve for said tool and said feeding' means, and means for actuating said valve through the assistance of the pressurel duid.

17. An-apparatus of' the class described having' the pressure fluid tool 1, t-he feeding cylinder 3, the feeding piston 7 the sleeve 8, the throttle valve 14', and pressure fluid supply passages 19, 2O and 21 controlled thereby. Y

18. In an air feed hammer drill, a head block, an air supply, an air feed cylinder attached directly to the head block, a piston located in' the cylinder having its rod eX- te'nded rearwardly to form a rear support for `the tool, and a manually operated valve in the head block for controlling communication between the air supply, the air feed cylinder and the hammer.

19. In an air feed hammer drill, a head block, a hammer tool, an air supply, an air feed cylinder attached to the head block, its piston having a lpart extending Afrom the rear of said cylinder, and aymanually operated valve in the head block having pas.- sages arranged when in one position to open communication between the air supply and the air feed cylinder and close communication between the air supply and hammer andwhen .in another position to open communication between the air supply and the air feed cylinder and the hammer. 20. In an air feed hammer drill, a hea block, a'hammer tool, an air supply, an air feed cylinder attached to the head block, a piston having a. part extendingfrom the rear of said cylinder, and a manually oper ated valve in the head block having passages arranged when in its first position to open communication between the air, feed cylinder and external atmospherer and close u. communication ,between the air fsupply,y the.

' air feed cylinder and the hammer; when in its second position to close communication between the air feed cylinder and external atmosphere and between` the air supply and hammer' andv tol open communicatlon be tween the air supply and air feedcylinder;

munication between the air supply; the air feed cylinder and the hammer.

21. In an air feed hammer drill, a head block, a hammer tool connected thereto, an

an supply, an nir feed cylinder attached to art ex-` the head block, a piston having a tending from the rear of said' cylin er,- and a manually operated valve havlng passages arranged when in one position to open 'com-4 munication between the `air supply and the air feed cylinder. and close communication between the air supply and hammer land when in another position to open communication between the air supply andthe air feed cylinder and the hammer.

22. In an air feed hammer drill, the combinationwith alhammer tool, of a feed cylinder having a rigid connection to the tool, a feeding piston within the cylinder, a fluid passage leadingy to the hammer tool, a fluid passage leading to the cylinder for admit-v and when in its third position to open comf tin? pressure fluid thereto, and a single manual y operated valve controlling said passages andarranged when in one position to open communication between the air supply and theair feed cylinder and close comrnunication between the air supply and hammer, and when in another position lto open communicationbetwee'n the air supply and 'the air feed cylinder and the hammer.-

In testimony whereof,A I have signed my name to this specification, in the presence of two' subscribing witnesses.

GEORGEl H. GILMAN.

Witnesses:

L. WILLsoN HALL, E. J. Bonet-IARD.

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