US1096437A - Fluid-actuated drill-bit forming, sharpening, and shanking machine. - Google Patents

Description

J. G. LEYNER.

FLUID AGTUATED DRILL BIT FDRMING, SHARPBNING, AND SHANKING MACHINE.

APPLICATION FILED MAR.25,1912.

Patented May 12, 1914.

Z SHEETS-SHEET l.

J. G. LEYNER. FLUID ACTUATED DRILL BIT FORMING, SHARPENING, AND SHANKING MACHINE. APPLICATION FILED LIAR. 25,1912.

1,096,437. Patented May12,1914.

2 SHEETS-SHEET 2.

f MMM ggg-@f- 4* Wwmm JOHN GEORGE LEYNIER, OF DENVER, COLORADO.

FLUID-ACT'UATED DRILL-BIT FORMING, SHARPNING, ANI) SHANKING MACHINE.

Specilcaton of Letters Patent.

Patented May 12, 19114.

Application led March 25. 1912. Serial No. 686,133.

To all whom it' may conce-rn Be it known that I, JOHN GEORGE LEYNER, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented a new and useful ltluid-Actuated Drill-Bit Forming, Sharpening, and Shanking Machine, of which the followingis a specification.

My invention relates to a dolly driving mechanism for drill sharpening and other `machines, and the objects of my invention are: First, to provide a dolly driving mechanism that is adapted to be applied to any kind or type of fluid operated drill sharpening and to other forgings upsetting machines. Second, to provide a dolly driving mechanism adapted to drill sharpening machines, that is arranged to be driven in one direction of its reciprocal movement by the forward strokes of a Huid actuated hammer piston reciprocally mounted in an operatively arran ed cylinder, and in the opposite direction o its reciprocal movement by a spring assisted by the suctional .force of the rearward stroke of the hammer piston of the cylinder. And third, to provide a dolly d riving mechanism that 1s provided with a slideway and a feeding mechanism by which itcan be fed away from the drill steel holding jaws far enough to insert and remove the dollies from their support, and that is pro-` vided with means by which it can be set and secured against accidental displacement in any desired pa-rt of its slideway, and with the dolly in any desired position relative to the die jaws of the anvil and hammer of the machine. I attain these objects by the mechanism illustrated in the accompanying drawings, in which:

Figure l is a side elevation partly in section, of a drill Sharpener. illustrating my improved dolly driving mechanism supported in operative relation thereto.l Fig. 2 is a plan view of Fig. 1. Fig. 3 is a vertical, longitudinal, sectional View through the hammer piston cylinder, the slideway therefor. and the feed mechanism for moving the cylinder on the slideway. Fig. 4 is a vertical, transverse, sectional view on the line 4-4 of Fig. 2, looking in the direction of the arrow. And Fig. 5 is a front end View of the dolly.

Similar letters of reference refer to -similar parts throughout the several views.

Referring to the drawings: The numeral I l designates a column'that forms the foundation base of an operative drill Sharpener, hereinafter termed the base. This column form of base is provided with a floor flange 2 and with a cylinderI bore 3, and at its top end a cylinder 3^ is secured to it in any suitable manner. The to of this cylinder 3A is provided with an anvil portion Il, and above the anvil a hammer block 5 is reciprocally mounted on bolts or rods 6 that are connected at one of their ends to the hammer block and that extend slidably down through the anvil and are secured at their opposite ends to the upper end of a piston head 7, that is reciprocally mounted in a cylindrical bore 3B, formed in the cylinder 3A. The bolts or rods (S preferably extend down thrugh the piston head and are secured to it by nuts 9.

The piston head is `preferably a differential ended piston, the upper end 7 being of disk form, and from this disk-shaped end a stem portion 8 depends into the cylinder 3, of the base. The disk portion and also the stern portion are provided with packing rings 8^. A throttle valve 10, which may he of any suitable multiple port type. and which is provided With a handle 10^, is secured to the side of the machine and is arranged to admit compressed air by a pipe ll, to the lower` end of the piston head to raise it in its cylinder and to its upper end, through suitable ports, to move it down in its cylinder alternately, which reciprocal movement of the piston imparts reciprocal movements to the hammer block, which is so relatively connected to the stroke of the piston head in its cylinder and to the top forging surface of the anvil that it reciprocates vertically above it in hammer blow striking relation to it, and the opposing faces of both the auvil and the hammer blockare arranged to receive interchangeable drill bit forming, sharpening and shanking die jaws 11A and 1l, and also die jaws for making other kinds of die formed forging work. These die jaws are held in recesses formed in the anvil and hammer block by bolts 11C and 11, which are arranged in slots to clamp the jaws in their recesses. The upper bolt is secured against dropping out of its-recess when loosened by an expansive spring 1l, which holds it by pressure in its slot.

, rock cutting drill bit Sharpeners, although in my present invention I preferably illustrate my dolly driving mechanism mounted von and supported by an arm 12, that forms an integral part of the cylinder 3. It could, however, be secured to a supporting bed plate or to any suitable slideway of abed or base forming a part of a 'drill sharpening machine, independently of the drill bit hold-l ing vise operating part,

The arm 12 projects from one side of the cylinder far enough to form a support for an engine cylinder 13, which is slidably mounted thereon in axial alinementpwith the longitudinal axis of the die jaws of the vise. This cylinder is arranged on the supporting arm to be moved reciprocally to and from the vise jaws and it is also arranged to be clamped rigidly to 'the support whenset in its dolly operating position. There are v several ways in which the engine cylinder may be adjustably secured and reciprocally moved on thesupporting arm. v

My invention contemplates any means by which the reciprocal feeding and adjustably setting and clamping features of my invention may be obtained, I preferably, howevercarry out this feature of my invention in the following manner: The upper end of l the arm'is provided with a table portion 14,

the opposite side edges of which are parallel to each other, and are provided with slidevvays 15, and the lower side of the cylinder is provided with a depending andy 4rearwardly extending base portion 16, the

' bottom edge of which is provided with ing.

guideways that fit over and bear slidingly against the slideways of the cylinders sup- 'porting arm. A longitudinal recess 17' is formed in and along the whole length of theY bottom of the depending base portion of the cylinder centrally between the guideways, and clamping bolts 18 are extendedat right angles to the guideways through lug portions 19 and 20 formed on the opposite sides of the base portion of the cylinder, and these bolts extend from one side through the base and beyond ythe other side, and a nut 21 is threaded to the end of each bolt and bears against the lug on the opposite side of the base. These lugs are provided with recesses in which the heads of the bolts fit loosely,- but close enough to prevent them from turn- By tightening up the nuts of the clamping bolts the guideways of the base portion of the cylinder are sprung together the slideways of the cylinders supporting arm, and when the nuts are loosened the cylinder can vbe moved slidingly -along the guideway of the arm toward and away from the drill steel clamping vise.

My invention contemplates any` suit-able means for moving the cylinder on its supporting arm. Thus, it could be moved by the hand of an operator or by any other suitable means. I preferably, however, employ a feed screw 22, which is arranged to be rotatably mounted-in a rearwardly extending Larm port-ion 23 that projects from the rear end of the cylinder and is divided for a portion of its length bythe recess 17 into two side portions, but that unite in one arm end portion at their outer ends. The outer end of this arm is provided with a .hub portion 24, through theA upper end of which'into the arm a short distance a clamping slot 25 is formed. The hub is provided with an aperture parallel with the axis of the cylinder and above it a bolt hole is drilled through the slotted portion of the arm at right angles to the aperture in the hub, and abolt 26 is placed through the bolt hole and draws the two divided portions of the hub and arm together. 0ne end of the feed screw is rotatably fitted in the aperture in the hub and is provided with a collar portion 27 that is arranged to,bear against' the inside o-f the end of the hub portion of the arm, while theadjacent terminal end of the feed screw exa tends beyond the outside end of the hub and its end is threaded, and the hub of a crank handle 28 is provided with a threaded aper-v ture that is adapted to be screwed onto the end of the feed screw against a shoulder portion 29. The hub of the crank handle is provided with a vdepending lug portion 30, which is slotted centrally into the bere of the'hub, and is also provided with 4a'vv bolt aperture that extends through it at. right angles-to its slot, and a bolt 31 is inserted in this aperture and is adapted to draw the parts of the lug on opposite sides of the slotand clamp the hub ofthe crank handle to u the threaded end of the feed screw, while the clamping bolt 26 is used to clamp the hub of the arm 23 tight enough to the feed screw to prevent the feed screw from turning accidentally in eitherdirection. This` feed screw is made long enough vto extend from 'this arm under the base 'portion and through a central recess 32 formed in the top surface of the cylinders supporting arm, and is adapted to permit the hammer cylinder to be fed backward far enough away from the drill steel gripping vise to permit the doily to be inserted in or removed from the dolly supporting head of the cylinder, and `it is threaded into and through a nut 33 which isV secured to the hammer cylinders supporting arm, the nut being arranged to set 1n a reand are thus clamped tightly and rigidly to cess 3st that is formed in the top surface of the arm 'in a'linement with the central recess 32. The nut is provided with a collar portion 36 which fits into an `enlarged annular groove 35, that is formed adjacent to the recess 34. 'One end of the nut is threaded and it pro'ects beyond the end of the arm, and a nut 3l is threaded to it and is turned up against the end 4of the arm and clamps Ithe collar of the nut' against the side of the enlarged groove 35 -nearest to the end of the arm and'of the nut.

The cylinder comprises the cylindrical shell 13 in which a main cylindrical bore 38 is formed, and that is also provided with a forwardly extended bore portion 39, of

larger-diameter than the bore 38. The bore 38 is the hammer piston bore, and a hammer piston -l40, is reciprocally mounted in it. This hammer piston is provided with a hammer bar extension 41, which projects forward through the bore 39. The bore 39 is larger in diameter than the bore 38 and a shoulder 42 is formed at the junction of these two bores. A front cylinder buffer and packing ring 43 is made to fit snugly in the bore 39 and rests against theshoulder 42. and is provided with an axial bore that is adapted to receive a cupped leather washer 44, that is arran ed to ft into the bore of the cylinder, `an also to fit snugly on the hammer bar extension of the hammer piston, and a plain cylinder ring 45 is also fitted snugly inthe bore 39 and is placed against the side of the front cylinder buffer ring. This 'plain cylinder ring is provided with an axial bore through which the hammer bar extension projects, with a close but slidable fit'. i

A cylinder'head 46 is secured by side rods 47, which extend through aperturesformed in lug portions 48 on the opposite sides of the head to a rear cylinder head 49, which is also provided with aperture'd lside lugs through which-the opposite ends of the bolts extend. These side bolts extend far enough beyondxthe rear cylinder head to receive expansion coiled springs 50, and a Spanner washer 51 isjplaced across and between the bolts and on Vboth of their ends, and nuts 52 are threaded on the ends of the bolts'and are screwed against the spanner washer and cause it to compress the springs 50, and to clamp thejtwo cylinder heads to the opposite ends of the cylinder, and places the cylinder' heads under a resilient clamping pressure that enables them, especially the front cylinder head` to yield under side or other strains or jars that would tend to break them if rigidly secured to the opposite ends of the cylinder. This is especially true of the front `cylinder head, which is provided with a forwardly rojecting hub portion 53, which, with the ange portion that forms the front cylinder head, I term the guide flange, as it supports the drill steel sharpening dolly 53A in an axial aperture 54, and the dolly, when striking against the uneven ends of drill steel, is subjected to severe side strains that are imparted to the dolly and front cylinder head and these resilient tension clamping side bolts receive' and cushion these strains. In order to secure the nuts against accidental unscrewing movement their washer engaging surfaces are provide with diametrically arranged projecting ribs 55, which fit into recesses 56 extending centrally across the center of each of the bolt receiving recesses of the side of the Spanner washer that faces the nuts, and the nuts, when tightened up are left with these ribs projecting into these recesses.

The front cylinder head, which I will hereafter term the guide flange, is provided with an axial bore 57 which registers in alinenient with the bore in which the dolly is mounted. This bore is also in alinernent with the bore 39 of the cylinder, but is smaller in diameter than'the bore 39 of the cylinder and is larger in diameter than the bore in which the dolly is mounted, and it forms a chamber around the engaging ends of the dolly and the hammer piston, while the inner end of the front cylinder head is provided with a projecting hub portion 58 that is made to project into the end of the cylinder against the plain cylinder ring and holds it against the front cylinder buffer ring and the front cylinder buffer ring against the' shoulder of the hammer piston cylinder. The guide flange 46 is provided with an automatically operatin valve, that is arranged and adapted to relieve the rear end of the dolly of back pressure from air `that leaks past the packing ring of the hammer piston along its hammer bar portion. By getting rid of this back pressure the rearward strokes of the hammer piston exert a suctonal drawing force action on the dolly that assists in moving it on the rearward strokes of its reciprocal movement. My invention contemplates any suitably arranged valve controlled aperture for effecting this` result. I preferably. however, carry out this feature of my invention in the following manner: 'lhe top surface of the flange portion ot' the guide flange is provided with an aperture 59, the entrance to which is threaded, and a plug (l0 is threaded to it, and is provided with an axial aperture (31 which extends through it into the aperture 59. The bottom of the aperture 59 is provided with a converging shoulder 62, and an aperture G3 extends from the center of this shoulder through the shell of the flange into the chami ber 57.

A ball ($4 which 'forms the valve, is placed in the aperturel and rests against the shoulder 62 which forms a valve seat for it` and an expansive tension spring G5 is placed with one end ou the ball and with its oppo- 15 of its reciprocal movement.

site end against the inner end of the plug 60 and thus holds the ballby its resilient expansive tension against its seat, and as the ball projects into the aperture 63, it norv mally holds this aperture closed, except when the hammer pistonl approaches the end of the dolly, when it forces the air that is lin the chamber. 57 into the aperture 63, and the air lifts the'ball and escapes through the 'aperture in the plug to the atmosphere.v

Then when thehammer piston moves backwardly on'its rearward stroke it exert-s a suctionaldrawing force on the dollyV that assists in moving it on the rearward strokes They hammer piston cylinder 13 is provided with a valve chest portion 66, which is provided with an airinlet aperture 67, to-which a swiveling elbow 68 that forms the adjacent end of an `air supply hose 69, is connected. This air hose l69 v extends from the three function .throttle valve chest, and the elbow is secured lto `the inlet aperture by a bushing 70, as is above described. This `swiveling elbow and Y ZAthe Abushing are arranged as follows: The

' bushing -is provided with a tapering aperture that is adapted to receive and litthe tapering end of the elbow, and theback pressure of the air entering the valve chest l7.30 :troml the elbow against -the inner enel ofthe elbow vpresses it outwardly with enough pressure to form an air tight joint between the elbow and the bushing. This valve chest is provided fwth a valve bore 71, in

y which asteel valve bushing 72 is secured by being pressed therein, and within this valve bushing a circular or round spool form of valve 73l .is reciprocally and operatively fitted to control an operative system of air 40 inlet and lexhaust ports arranged in the valve chest and* cylinder to operatively rev/ciprocate the hammer piston to drive the dolly to sharpen the heated ends of ldrill steel. The opposite ends of the-valve bore l of the valve chest are threaded, and plugs y74: are removably threaded to them, said plugs being provided with a wrench receiving portion 75v to enable them to be turned into Yand out of the valve chest, and they are arranged to screw against the opposite ends of the valve bushing 72. The entrance port of the valve chest of the hammer piston cylinder connects with a central circular recess 1 port 76, that is formed in the valve chest 555 `around the bushing, and the valve bushing is provided with a circumferential row of air inlet apertures 76A, that register with the air inlet port 76. On the'opposite sides of the central air inlet port 76 of the valve chest, and at equal distances from it, circu'- lar ports 77 and 78 are formed in the valve boreof the valve ychest around the valve bushing, and these ports connect with ports 79 and 80.that lead through the shell of the B51 cylinder to the opposite end portions of its Lomas? hammer piston bore, which ports act as the air Ainlet and exhaust ports to and from the hammer piston bore of the cylinder. The ports 77 and 78 register with the interior of the valve bushing throughl a circumferential 7@ row.- of ports 7 8A, las shown, and in the inv'terior wall surface of the bushing, annular recessed grooves 7 8B are cut to extend into one-half of the diameterof each circumferential row of apertures, and these grooves are arranged -on the inner side of these two rows of apertures. They are adapted to permit the air to flow quickly and in ample volume intov the cylinder ports 77 and 78. On the opposite sides of the ports 77 and 78, 80 .and at equal distances from them, a pair of circular recess ports 81 and 82 are formed in the valve bore ofthe valve chest. These ports are exhaust ports that are arranged to lead through the valve chest to the atg5 These exhaust ports 81 and 82 ing by two circumferential rows of ports 83 that register opposite to these ports. The cylinder and valve chest are provided with port4 holes 84: and 85, which are shown` in dotted lines in Fig. 3, and these ports extend from the opposite side portions of the central portions ofthe length ofthe hammer piston cylinder, up through the shell of the cylinder and into the extreme opposite end portions of the valve chest. These ports are arranged to permit live air from the cylinder to iow on the forward and rearward strokes of the hammer piston to the opposite ends of the valve bushing and move the valve alternately to the opposite ends of its throw. movement. The valve comprises a spoolshaped valve that consists of a stem-shaped body portion 73, having collar portions 86 105 which are considerablyv larger in diameter than the stem port-ion, as shown'inthe sectional view, Fig. 3. My invention, however, contemplates yany operative .hammer piston reciprocating valve and port mechanism for driving the dolly.

The supply of compressed air enters the valve chest inlet ports through the hose 69,A from the three function throttle valve lOvto the central part of the stem lportion of the valve between its central collars, and moves the valve, allowing ittol uncover either one or the other of the cylinders inlet ports to -the hammer piston,- Which reciprocates the hammer piston, and as it freciprocates, a portion of the live air vflows alternately throu h ports 84 and 85 to the opposite ends of tA e valve bushing and instantly and positively throws the valve to the opposite end of its reciprocal stroke, thus insuring a positively operating. valve and a powerful and quick acting dollyl driving hammer piston.

, In order to insure that the dolly will make the return or rearward stroke of its reciprocal movement with the same relative speed Lso as the hammer piston makes its rearward strokes, I provide the dolly, in additionto the suction force of the rearward strokes of the hammer piston, with a spring so arranged and connected thereto as to force the dolly rearwardly after each ,blow of the hammer' piston to the full end of its opera.-` tive rearward stroke by its resilient tension.

My invention contemplates any resilient means by which the dolly can be moved on the rearward strokes of itsreciproeal movement. I preferably, however, carry out this feature of my invention in the following manner, and preferably use for this purpose an endless wire spring 87.` This spring comprises a central yoke portion 88, that is long enough to extend across the top of the dolly and is adapted to be hooked over a. hook 89 formed inthe top of the dolly by making a. right angled slot 90 into the dolly, into which the yoke center 88 of the spring fits loosely, the Qslot being arranged to permit the wire to rest under the end of the hook. The spring has two side wire portions 91, extending at right angles from the center of the yoke portion. These side wires are several inches in length and are of equal length, and at their outer ends they are turned int/o a pair of coils 92, which are arranged opposite to and in aline-ment with each other. The ends of these coils then extend in straight portions 93, from the opposite side of the coils from the side wires 91, and project from these coils in a direction to cross the side wires 91 of the spring. These ends are of a triflel greater lengththan the yoke portion, and at their terminal ends they are bent into curved hooks 94, which are arranged and adapted to hook over a pair of trunnions 95 that are formed on the opposite under the hook, which movement tightens the convolutions of the wire in the coils of the spring and places the yoke portion under a resilient tension that is sufficient-to move the dolly on -the rearward strokes of its reciprocal movement in unison with the rearward strokes of the hammer piston. The yoke ortion of the spring has to be unhooked from the hook of the dolly every time a dolly is inserted in the guide flange and every time a dolly is removed from the guide iange to be replaced by another dolly. And in order to do this it is only necessary to rasp the yoke portion of the spring and spring it out from under the hook 89 of the dolly. v

In order to define the position of the dolly Ainf the guide fiange relative to the striking movement of the hammer piston, Iprovide the dolly with a shoulder as shown, which is larger than the shank end of the dolly and is normally held by the resilient tension of the spring against the end of the hub portion ofthe guide 'flange The drill steel sharpening end of the dolly may be made into any shape and number of lips it is desired to form on the end of drill steel or that it is desired to use in resharpening old dull drill bits, the term drill steel preferably applying to drill steel upon which rock cutting lipsare to be newly formed, and drill bits applying to old drills that require resharpening.

I preferably illustrate a dolly provided with four lips arranged around its face end in four equal sized radially arranged rock cutting lips 9.6, as shown in Fig. 5. When it is desired to change dollies to make a different number, or a different kind of rock cutting lips on the drill steel or drill bits, the cylinder is loosened on the slideway of its supporting arm by loosenin v the nuts on the bolts that clamp the base o the cylinder to the slideway. The cylinder and the dolly can then be fed backward from the anvil by the feed screw far enough on the supporting arm to enable the dolly to be drawn out of the hub portionof the guide flange without striking the anvil, and in order to prevent the feed screw from unscrewing from its nut 33 by feeding the cylinder farther back on the arm than is necessary to remove the dolly, I provide the cylinder with a stop bar 97. One end of this stop bar is threaded to the anvil portion of the vise and the bar extends from the anvil alongside of the cylinder and extends loosely through an aperture, formed in a laterally projecting lug 98 that 1s formed on one side of the cylinder. Stop collars 99 and 100 are mounted slidablv on the rod on opposite sides of the lug, and they are each provided with a set screw 101. by which the c ollars may be secured on the outer end of the rod wherever desired on opposite sides of the lug. The operator first moves the throttle valve to admit air to the bottom of the piston head 8 of the piston 7 to raise thispiston and the hammer block, and thus to open the jaws of the drill steel gripping vise. Then, having inserted a heated drill bit or a, bar of drill steel that he intends to make into a drill bit, into the die jaws of the vise, he moves the throttle valve to admit air to the top of the disk portion of the piston 7 of the cylinder 3^, to move it and the hammer block and the upper die jaw down, thus closing the die jaws of ,the vise between its anvil and the hammer block to grip the drill steel. The operator then continues the movement of "the valve to admit the compressed air actuating iuidvinto the valve chest of the dolly driving'hammer lpiston cylinder which'reciprocates the hammer-piston of the cylinder and drives the dolly against the end of the ywhich shuts the air 01T from the dolly engine and also opens the vise and releases the drill bit. My invention, however, contemplates my dolly driving mechanism connected t-o lany suitable valve and supply of compressed air independeptlywof the valve and supply o f airftlat controls the'drill 'steel gripping vise.

My invention provides a simple, highly efficient dolly driving mechanism that can beapplied to any operative drill bit gripingr',r vise mechanism.

Having described my invention, .what lv claim as new and desire to secure by Letters Patent is:

1. A fluid controlled drill Sharpener oomprising a supporting base, a vise on said base, a fluid controlled hammer cylinder mounted on said base and provided with a dolly supporting guide flange, a drill sharpening dolly reciprocally mounted in said guide ange in the reciprocal path of said hammer piston and in alinernent with saidy yvise and adapted to beactuated by said hammer piston on the .drill sharpening stroke of its reci rocal movement to enter said vise, said'dol y having a hook projecting from and extending across-its top portion and provided with a slot in it under said hook, trunnions on the oppositev sides of said guide ange, a double coiled spring having a pair of ends secured to said trunnions and provided with an oppositely eX- Vtending cent-rall yoke portion' arranged to v be 'sprung over the hook portion of said vce dolly, said spring and hook being so cooperatively connected as to prevent rotative movement of said dolly, said spring being arrangedto move said dolly on the inoperative strokes of its reciprocal movement. y

'2, ln a drill Sharpener the combination of a base, a -vise on said hase, a projecting arni on said base provided with a slideway, a cylinder slidablymounted on said slideway, means for adjusting and securing said cylinder on said slideway, a hammer piston reciprocally mounted in said cylinder, said `cylinder being provided with a combined front cylinder head and a dolly support, a dolly reciprocally mounted in said support in alinement with said vise and arranged to coperate therewith in forming and sharpeningdrill bits, and arranged to be driven into said vise by the forward strokes of said hammer piston.

-3. In a drill steel forming and sharpens ing machine, the combination of a support,

a drill bit holding vise thereon, a hammer piston cylindei yslidably mounted on said support, means-for securingsaid cylinder in adjusted positions on said support, afeed v screw for feeding said cylinder back 'and-'- forth o-n said support, a hammer piston re-v ciprocably mounted in lsaid cylinder, a dolly.-

support in saidv cylinder, a dolly reciproing table portion projecting from said vise,

slideways on opposite sides of said table portion in alinement with said vise', said` table portion having recesses between said slideways, a threaded nut`secured to said' l table portion in said recesses, a cylinder ari vat ranged to support a dolly and provided with a depending guideway portion split Lcentrally of its length by a slotinto parts, a i' guideway on the lower edge of veach part of.

said depending portionof said cylinder arranged to straddle said table portion and fit -slidably on its slideways, clamping bolts eX- tending transversely through the recessed guideway portion of said cylinder and arranged and adapted tovelamp said guideways and cylinder rigidly to said slideways in any desired adjusted position relatively lto .said vise, said guideway portion of said cylinder being provided with a rearwardly extending arm portion, a feed screw rotatably mounted in the outer end of Said arm and threaded to the feed nut of said table, means for securing said feed screw against accidental movement, a dolly fitting in the end of said cylinder facing said vise, and means connected with said cylinder for reciprocally drivin said dolly into operative drill steel and drill bit upsetting and sharpening relation to said vise, said slideway table support for said cylinder, and said. feed screw being arranged and adapted to feed said cylinder away from said vise far enough to permit the dolly to be inserted in or removed from said cylinder between its end and said vise.

5. In a drill bit'shrpener, a drill steel gripping vise, a slideway adjacent to said vise provided with a feed nut, adolly driving" cylinder and hammer piston slidably mounted on said slideway, a 'dolly reciprocally supported by said cvlinder to enter on said cylinder and threadedthrough said feed nut and arranged to feedsaid cylinder far enough away, from said vise to permit said dolly to be inserted or removed from ico' said cylinder, and, means including bolts for securing-said cylinder and feed screw` inset" gled recess extending across the top of said dolly, a hammery piston'reciprocally mountled in said cylinder and arranged-to drive said dolly on the drill sharpening strokes of its reciprocal movement, and a spring ar-l ranged to move said dolly on the rearward strokes ofits reciprocal-'1novement,` said spring comprising a pair of coils arranged side by side and at a short distance apart and having -tWo of their ends similarly arranged and extended to said cylinder, means for releasably securing said ends to said cylinder, said coils being provided with opposite ends projecting from the opposite sides of said coils from their fixed ends and arranged to extend from said coils in the form of a yoke, said yoke being arranged to be sprung away from the'fxed ends of said coils and Vto thus place the coils under resilient tension and to be sprung over said hook into the recess in said dolly, thus holding said dolly under resilient tension in its support in said cylinder.

7. In a fluid operated drill bit forming,

shanking and sharpening machine, the combination of a vise comprising a stationary lower member and a movable upper member, a dolly engine mounted adjacent said vise, a valve for controlling the operations of said vise and dolly engine, a handle for operating said valve, means for causing said movable upper member to engage said stationary lower member upon' movement of said valve before causing the .operation of said dolly engine, and 4means for sto ping the operation of said dolly engine beibre opening the'vise, upon reverse movement of said valve.

8. In a dolly-driving mechanism for drill- Sharpeners, a supporting-base provided with a vise, a forgin dolly arranged in operative relation to sai `vise, an engine for reciprocating said dolly, and means for moving said dolly-engine to and from and for securing it in any predetermined position relative to said vise.

9. In a dolly-actuated mechanism for drillsharpenin machines, the combination of a base provlded With a drill-gripping vise., a slideway on said base, a feed-screw nut secured to the slideway of said base, with a hammer-piston cylinder provided with a removable dolly, said cylinder having guidevvays slidahly mounted on the selidcvvay of said base, a feed-screw connected to said cylinder and threaded to the nut in the slideway of said base, said slideway and cylinder and feed-screw being arranged to feed said cylinder to and from said drill- 1n or -to` remove it from said cylinder, and means for controlling the movement of said lvise and dolly-operating piston to actuate said Vvise Aand dolly in coperative order to form and sharpen drill-bits. l

10. A dolly-driving' mechanism for fluidcontrolled" drill-sharpening 'machines` comprising a supporting-base provided with a drill-bit holding vise, and a supporting-arm ,orr bed-plate portion having a slideway extendin from the drill-bit sharpening end 'of-sai vise, adolly-operatin enginey arf iranged .to be adjustably clam e tothe slideway of said arm, and a rill-sharpening dolly reciprocally mounted in the path of said dolly engine,

11. A dolly-driving mechanism for fluidactuated drill-Sharpeners, comprising a supporting-base, a vise on said base, a hammerpiston cylinder' mounted on said base and provided with a dolly supporting guideian e, a hammer-piston in said cylinder, a'dull-sharpening dolly reciprocally mounted in said guide-flange in the reciprocal path of said hammer-piston and in alinement with said vise and adapted to be actuated by sa-id hammer-piston on the drillsharpening stroke of its reciprocal movement to enter said vise, said doll having a hook projecting from and exten ing across its tov portion and provided with a slot in it un er said hook, trunnions on the opposite sides of said gnide-flange, a double-ended and -a double-coiled spring having one pair of its double ends secured to said trunnions and having, its opposite double-end portion provided with an oppositely extending central and terminal-end-curved yoke-shaped portion arranged to be sprung over the hook-portion of said dolly, said spring and hook being so cooperatively connected as to prevent rotative movement of said dolly. said `spring being arranged to move said dolly on the inoperative strokes of its reciprocal movements.

' gripping vise far enough to insert a dolly 12. In a dolly-driving mechanism for drilli sharpencrs, the combination of a base, a drill-bit gripping'vise on said base, a projccting arm on said base provided with a slideway, a hammer-piston cylinder slidablv secured to the slideway of said arm, a feedscrew arranged to feed said cylinder back and forth on the slidcway of said arm toward or away from said vise. and a dolly arranged to he struck by said hammerpiston.

13. In a dolly-driving mechanism for drill- Sharpeners. a supporting-base provided with a'vise,l a dolly-carrier, u forging dolly in said carrier in operative relation to said vise, means for moving said dolly-carrier to and from said vise far enough to insert a dolly in or to remove it from said carrier, and means for securing the dolly-carrier in any predetermined fixed operative position relative to said vise.

14. In a drill-Sharpener, a vise, a dollyengine, a guide-flange vin the front of said engine, a dolly in said guide-flange in operative relation to said vise, and a spring connected to said dolly and to said guide-Hange for returning said dolly after its drillsharpening strokes. y

15. In a drill-Sharpener, e vise, a dolly! engine having a hammenpiston cylinder, a

combined guide-flange and front cylinderhead in said engine, a dolly in said guideflange and front cylinder-head in operative relation to said vise, and a spring connected to said dolly andto said. guide-flange and front eylindenhead for returning said dolly after its drill-sharpening strokes.

In testimony whereof I ailix my signature in presence of two Witnesses..

JOHN GEORGE LEYNER.

`Witnesses: t

GEORGE It, GRIEVE, G. SARGENT ELLIo'i'r.

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