US919969A - Rock-drill sharpening and shaping machine. - Google Patents

Description

G. J. SMITH. y Boon DRILL smnrzsmeun amm@ msnm.

APPLIOATION FIL'ED PEB. 8, 1007.

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.0. J. SMITH. ROOK DRILL SHARPBNING AND SHAPING MACHINE.

APPLICATION FILED PEB. 8, 1907.

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ROCK DRILL SHARPENING AND SHARING IIAGIIINE.

APPLICATION FILED FEB. 8, 1907. y

"Patented A151127, 1909.

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.CLARK J. SMITH, `OF

orrurnm, Iowa, assit-anon To nARnsoce WONDER INCORPORATED, OF OTTUMWA, IOWA.`

DRILL GO.,

ROCK-DRILL SHARPENING AND SHAPING MACHINE.

Specicaton of Letters Patent. 'K Application fried February s, 1907. serial No. 356,481.

Patented April e7, 1909.

To all whom it may concern: J

Be it known that l, CLARK J. SMITH, residing at Ottumwa, in the county oi'Wapello and State of lowa, have invented certain new and useful Improvements in Rock- Drill Sharpening and Shaping Machines, oil which the following is a specication.

My invention relates to certain new and useful improvements inmeans for sharpening, forming and shaping rock drill bits, and it more particularly has ior'its object to provide amachine of this character oi a very simple and effective construction, composed of a minimum number oi parts and in which the parts are so arranged and designedas to be capable of ready control by the operator and will be automatic in their. operation. I

G-enerically my invention comprises a" suitable supporting bedupon which is mounted the shaping `and .slot cutting devices and the sharpening devices proper.

e The shaping and slot cutting4 mechanism 1n its generic nature comprises a supportmg frame secured to the bed frame in which a.

supportin column is held, the upper end oi this co umn carrying a iXed` die and a pair oi shiftable dies and at the lower end the controlling valve land feeding mechanism are supported. The controllingvalve and feeding mechanism arecoperatively connected with a pneumatic hammer that is adjustably held lin the column supporting frame and cooperates with the shii'tabl'e dies;

The sharpening mechanism `proper consists oi a drill supporting means'inclu'ding a pneumatic bumper or holder to 'coperate with the drill and also includes a dolly holder and hammering engine to coperate with the dolly for sharpening the drill end, the pneumatic hammer including means coperatively connected therewith `whereby the same can be controlled and automatically ied up to the work. l

In its more subordinate nature my invention includes certain novel construction,

combination and arrangement o'll vparts allV oi which will be first described in detail, and then be specifically pointed out in the appended claims, reference'being had to the accompanying drawings, in which:

Figure 1, is a perspective viewk oi my invention looking at the same from the front of the machine.` Fig. 2, is `a similar `view looking atthe invention from the rear of the machine.V Fig. 3is a central, vertical loin- V shown.

gitudinal section of the invention showing the position of' the parts just prior to. bringing the dolly in engagement with the bit. Fig. 4, is a similar view showing the position of the parts as the dolly is engaging the bit to sharpenthe same and the piston oi' the hammer being in its dolly engaging position. Fig. 5, is a vertical, cross section on the line 5 5 oi Fig. 3, showing the position of the parts when the shaping Jdies are separated. Fig.,6, is a similar view showing. the position of the parts whenthesha ing dies are operating on the drill bitto brmg the same into proper gage. Fig. 7, isa cross sectionon the line 7 7 of Fig. 5. Fig. 8, isa cross section on the line 8-8 of Fig. 6. Fig. 9, is

across section on. the `line 9-J-9 of Fig. 5. Fig. 10, is a detail perspective view of the shiftable die holder and its dies'. Figs. 11,

.12, and 13, are perspective views of` various forms of dollies which may be used v1n my machine.l Fig. 14, is a detail perspective kview of the end oi a drill bitformed' by my machine. s Referring now to the accompanying drawmgs in whichlike letters an numerals of -rcierence indicate like parts in all oi the iigures 1 designates the bed frame of the machine which comprises'the bed 1 a which may 'bein the nature of an ordinary I-beam to which are bolted the standards or legs 1b, as

' To one endV of the I-beam 1a. a' drill holder 17 is secured by bolts 17a or otherwise, and the drill holder 17 is bored out at 17 b to form a hollow chamber which' is closed at one end by the web 17 c.that is a 'ertured as at 17d to receive the end 50a oft 1e drill bit 50. The chamber 17bis closed at its other end by a threaded plug 17e whichhas a passage 17f communicating with the air feed pipe 17g as shown Held withinthe chamber 17h is a bner block 17 h that is'held against the end 50a of the drill' bit 50 by pneumatic rpressure Within the chamber 171` between the buiier block 17h and' the plug 17 e in a manner more fully explained later. Slidably mounted on the I-bearn 1a is a drill carriage 18 which has flanges 18a to fit .over

- the I-beam and which is provided with a drill receiving pocket 18h, as shown, whereby the drill may be held in the pocket 18b in such a 'manner as to be readily removable. 22` designates the hammer support whlch is vlined to the I-beam 1a by set screws 22,

if desired, and the hammer support is provided with a longitudinal aperture to receive the hammer casing 21, the hammer casing and` hammer will be more fully described hereafter.

20 designates a dolly support which is` slidably mounted on the I-beam 1il in a manner similar to the drill support 18 and the dolly support 20 has ilanges 20a to cooperate with the I-beam 1a and has a dolly receiving aperture 2Gb in which the dolly 19 is held, the dolly 19 having a shank 19d and a head 19b which is provided with the cutting points or teeth 19C, as shown, and the center 19Cl for use whenever a hollow drill bit is being operated upon. The shank 19al is of two diameters one of which 19x is such as to iit into the chuck 21X of the hammer casing.

The pneumatic hammer in my present invention is of thereciprocating type and consists of the casing 21 which has a central bore provided with annular iianges 21a, 21h, 21c to separate the bore into a series of chambers 21 d, 21e, 21f and 21g res iectively, the `chamber 21g being adjacent t e chuck end of the casing and communicating with the atmosphere through exhaust ports 21h, as 'shown The end of the casing 21 opposite the chuck 21X is closed by a screw plug 21y having a bere 21z that meshes with a passage 21k in the hammer casing, the passage 21k communicating with the chamber 21f through ports 21ID as shown.

The passage between the chambers 21f 'and 21g formed by the web 21c is of less diameter than that between the chamber 21 d, 21e and 21f to properly cooperate with the reciprocating hammer piston 21n which has a central bore V21p and radial apertures 21r and 21S at opposite ends. The hammer piston 21n is provided with a hammer head 21t and an enlarged butt end 21u for the usual purposes. The screw plug 21y receives a piston rod 235 that passes through a cap 23L on the feed piston casing 23 and the piston rod 235' projects into the easing 23 and carries a suitably packed piston head 232,A as shown. The casing 23 is held in the support 24 by a set screw 24EL the support '24 being in turn iixedly secured to the I-beam by screw bolts 24h or in any other desired manner. The other end of the feed piston casing 23 is closed by a screw plug 23b having a passage through which the working agent is passed from the working agent feed supply pipe 23C, the working agent passing through a three-way valve 25 before it comes in contact with the piston 23X. The three-way valve 2-5 has ports 25a that permit passage of the working agent from the supply ipe 23C into the piston casing 23 to force t 1e piston 23Z outward and the ports ofthe valve 25 are also so arranged that when the Vvalve is in another position the working agent within the chamber 23r terminates in of the piston casing 23 will be exhausted to atmosphere through port 23'", but when the valve 25 is in a third position the exhaust port 23s as well as the working agent fed to the chamber 23T is cut o'll` rendering the feeding of the pneumatic hammer to the work inoperative.

The shaping and slot cutting mechanismwhich forms a part of my present invention, comprises a supporting frame 8 which is secured to the bed plate l by bolts S, as shown, and which carries a supporting rod or column 9 that is adjustably held in the supporting frame S by clamping bolts Sh, as indicated in Figs. 5, 6 and The upper end of the column 9 is reduced as at 9 and a shorter portion to receive a securing nut 1x which holds` the upper die holder on the reduced part Q of the column 9. The upper die holder 2 is soclrcted at 2 to receive the upper die 3 which is held in position by a set screw 2b, as shown, and the upper die 3 has a shank 3 and the head 3", the under surface of which is shaped to properly form the drill bit end.

7 designates a collar secured to the column 9 by a set screw 7a so as to support the lower die holder 6 which has a hub portion 6 apertured to receive the column Q, and the lower holder 6 is rotatable on the column 9 andheld in its various positions by a spring latch 7b carried by the collar 7 which enters depressions 6b in the hub portions G of the die holder 6. The die holder 6 comprises a die carrying arm 6C having' a pair of die receiving pockets 6d to respectively receive the shaping die 5, and the slot cutting die 5, as shown, the shaping die 5 having a head 5" whose upper face is shaped to correspond with that of the die head 3b to properly shape the drill end, while the die 5'l has its head provided with a groove forming prismatic member 5c which forms the side grooves in the drill head as will be hereinafter more fully explained, each of the dies 5 and 5 having shanls 5l which in turn have reduced ends 5e to be received in thc chuck 11x of the hammer casing 11. The hammer casing 11 is longitudinally slidable in the aperture SX in the frame member 8 and is provided with an. outer annular groove 1] having radial ports 11lv that communicate with an internal bore or chamber of the casing. The internal bore or chamber ol the casing 11 is divided into a plurality of sets of compartments, 11b, 11"', 11d, and 11C respectively by annular flanges Hf, 11y and 11h, as shown.

l'eciprocably mounted within the casing 11 is a hammer 100 which comprises the head a and the butt 100" and the internal chamber 100C. The hammer 100 is provided with radial apertures 1001 adjacent the head 100a and corresponding apertures 100C in the butt lOOb.

El (l SY designates a port communicating with the bore 8x near the Itop thereof in communication with which port the air supply pipe 10 is connected and in this pipe 10 a cut-o6" valve 1()a may be placed, if desired.

The lower end of the casing 11 is closed by a screw plug 11k to which connects a piston rod 111 that projects through a gland 12c into a piston chamber 12b forming a part of a bracket 12 which secured to the rod or column 9 by a hub 12Y that is apertured at 12a to permit passage of the rod 9, and the hub 12y is secured to the rod 9 by screw bolts 12X, as shown. The piston rod 111 carries a piston 111a at its end which is provided with suitable packing devices 111", the lower end of the piston cylinder 12b being closed by a screw plug 111, as shown. The bracket member 12 includes a supplemental piston cylinder or chamber portion of two diameters, 12d, the larger, and 12e the smaller diameter,

and within the chambers 12d and 12e a treadle operated valve piston rod 112 operates and the rod 112" at its upperend carries a piston 112* provided with suitable packing devices 112dl and also carries a supplemental piston 112Vc provided withsuitable packing devices 1121, as shown. The piston 112a operates in the larger bore: 12l while that 112d operates in the bore 12e, a collar 112e secured to the piston rod 112 serving to limit the upward movement thereof. The valve piston 112 is pivotally secured to a treadle 15 that is pivotally mounted at 15a to the column 9, by a link 113 that is pivotally mounted at 113a to the valve piston rod 112 and is pivotally connected atll)b to the treadle 15. The chambers 12b and12d are in communication with one another near their upper ends by ports 12f while the chamber 12e communicates with the chamber-12b through port 12g that is; in communication with the chamber 12d near its lower end' sov that the working agent supply can enter directly into the chamber k12Si at all times.

1141L designates a gage member that is secured to the upper die holder 2 so that the drill may be gaged from time to time in order to enable the operator to form a drill of the desired size. The gage 114 consists of a lat member having a series of bores. of different diameters. The drillmay be gaged by simply passing it througheither one orthe` other of the apertures, depending upon the size drill which it is desired to make.

1n order to have all parts of the apparatus under control of the operator while standing in one position, the three-way valve 25 hereinbefore referred to is operated through a rod 26 that passes through a bearing 26a on the vend of a bracket 2,6b secured to the bed plate 1 a of the machine, the end ofthe rod 26 being adjacentthe drill support 18 so that while the operator manipulates the treadle 15 with one foot and grasps the drill with his left hand he may control the valve 25 with his right hand by grasping the rod 26 and shifting the same as may be desired.

So far as described, the manner in which my invention operates will be best explained as follows After the drill 50 has had its end 50a inserted into the holder 17 with its end 50b readyto be operated upon by the dolly 19, and after the drill 50 has been laid in the holder 18, the operator opens the three-way valve to admit the working agent into the chamber 23r of the feed piston mechanism and forcesl the hammer casing 21 and consequently the dolly 19 forward until the dolly 19 is in contact with the end 5()b of the bit 50.

As the feeding takes place the working agent will pass through the aperture in the piston rod 23y and through the passage 21k into the interior of the casing 21 and thus operating the hammer piston 21, to force the dolly 19 to forni the teeth on theend of the bit 50, and at the same time upset the same as at 5l)c to bring it into proper shape. After the drill has been sharpened and upset by the action of the dolly 19, the same is removed from the holders 18'andV 17 and laced between the dies 3 and 5, and broug it down to the propergage, it being understood that the drill bit 50 can be removed from the dies 3 and 5 from time to time and passed through the gage k1 14 sothat the exact diameter of the butt end may be brought to the desired size. After the bit end 5()b has been formed into the desired gage? it may be returned to the sharpening mechanism and the sharpening action completed, it being understood that in practice it may be desired to transfer the drill 50 from the action of the sharpening apparatus to that of the gaging apparatus from time to time back and forth until the drill is both sharpened; and gaged to the desired degree. Vthen it is desired to supply the drill vrbit 50 with clearance grooves .50 d, then the die holders 6 are swung on the column 9 to bring the die 5a into play, the die 5a having the required member 5C to Aform clearance grooves 50 d on the drill bit between the teeth as occasion may require and in a manner well understood by those skilled in the art.

`In operating the shaping and gaging mechanism,'the operator places his foot upon 4the `treadle 15 to draw down the valve piston rod 112 to close the port 12f by the piston 112a and open up communication between the chamber 12fl through the chamber 12a to the port 12g so that the working agent can enter the chamber 12b ahead of the piston 111b and force the piston rod 111 upward, carrying with it the haunner casing 1.1 and feeding the same and in turn the die f5a or 5, as the case may be, toward the die 3 to properly act upon the drill bit, it being understood that as soon as the casing 11 has been moved up sufficiently to permit the annula'r groove 11a coming in alinement with the port Sy, the working agent from the chamber 12b will pass out through the port 12Z, via the pipe 10 to the port 85' and enter the annular groove 11il from whence it will pass through the annular ports into the interior of the hammer casing 11 and act upon the piston 1GO in a manner well understood by reference to the drawings, thus causing piston 100 to reciprocate, and impact upon the shank 5e of the lower dies 5 or 51, respectively.

In the practical application of my invention, 1 desire it understood, that while I have shown a six-point bit, 1 do not limit myself to the sharpening of bits having six points, since my machine can be used with sharpening dies having the ordinary chisel point, or any number of points; the dolly which does the sharpening may have the same number of points as the bit shown in Fig. 12, or it may have a less number of points as shown in Figs. 13 and 14, and a bit may be sharpened with a dolly having the saine number or a less number of points as will be readily understood by those skilled in the art te which the invention appertains. 1n the shaping and truing operation of my apparatus, the points of the bit may be also rounded it desired.

From the foregoing description taken in connection with the accompanying drawings it is thought the complete construction, operation and numerous advantages of my invention will be readily understood by those skilled in the art to which it appertains.

W hat I claim is 1. 1n an apparatus of the class described, a column or support, a relatively iixed die v holder carried b said column a die carried by said die holder, second die holder adjustably mounted on the coli nn, a plurality of dies carried by said second die holder, combined with" means continuously tending to move all oi said last named dies toward the relatively fixed die while simultaneously impacting the movable die.

2. In an apparatus of the class described, a relatively iixed die and a relatively movable die, an impacting engine for receiving said relatively movable die, a support for said impacting engine', said support having a working agent inlet port and said impacting engine having a working agent inlet port, means for moving the impacting engine and the movable die toward the vfixed die to bring the leed port of the engine in alinement with the feed port ol its support to operate the impacting engine, substantially as shown and described.

ln an apparatus of the class described, a relatively iiXed and a relatively movable die, an impacting engine cooperating with the movable die, a support for the impacting engine through which. the impacting engine is movable, said. support having a working agent inlet port, said impacting engine having a working agent inlet port to cooperate with the inlet port ol its support at times, means tor normally holding the impacting engine with its port out of register with that of its support, and means lor bringing the impacting engine with its port in register with. the port ol its support to operate the impacting engine and lecd the movable die toward the fixed die.

4L. ln an apparatus of the class described, a Ylixed and a movable die, an impacting engine for receiving the movable die, a support having an aperture in which said impacting engine is endwise movable, said impacting engine having a. working agent inlet port, said engine support having a working agent inlet port adapted to register with that of the impacting engine at times, a piston carried by the impacting engine, a piston casing cooperating with said piston and having a piston controlled port, in eonnnunication with the port ol the engine support, and means for admitting working agent in said piston casing to normally hold the impacting engine with its port out ol' register with that of its support, and means tor admitting working agent in said piston casing to force the impacting engine in one direction to bring its inlet port in register with that of its support, substantially as shown and described,

5. ln an apparatus of the class described, an impacting engine combined with a feeding mechanism therefor, said feeding meehanism comprising a support having a main piston chamber having an outlet port, a piston rod carried by the impacting engine, a piston on said piston rod operable within said main piston chamber, said support having a supplemental chamber, a valve stein held in said supplemental chamber, istons carried by said valve stem, piston controlled ports between said supplemental piston chamber and said main piston chamber, and manually controlied means for shifting said valve stem to open up communication between the sul'iplemen tal piston chamber and said main. piston chamber at either side of said impacting engine carried piston, a support for said impacting engine having a working agent inlet port in communication with the working agent outlet port of' the Ward the movable die an ported relatively movable die holder, a pair of dies carried thereby, an impacting and feeding engine coperating With said relatively movable dies, means Whereby said l relatively movable die holdermay be moved to bring either of its dies in alinement With the impacting engine, as desired, substantially as shown and described.

7. In a rock drill shaping machine, a fixed and a movable die, a main support, an impacting engine, an impacting engine support secured to said main support and` 'apertured to permit passage of the impacting engine, means for feeding the im acting engine totoward the fixed die and simultaneously admitting Working agent to the impacting engine to operate the same.

8. In a rock drill shaping machine, a fixed and a movable die, a main support, an impacting engine, an impacting engine support secured to said main support and apertured to permit assage of the impacting engine, means for ceding the im acting engine toward the movable die an toward the fixed die and simultaneously 4admitting Working agent to the impacting engine to operate the same, said moving means comprising a piston and rod carried by the im acting engine, manually controlled valve evices for admitting Working agent to said piston to force the impacting engine longitudinally.

9. In a mechanism of the class described, the combination with the shaping dies and the support therefor, of an impacting engine, a support in Which said impacting engine is longitudinally movable, said support and said impacting' engine having coperative ports, means for admitting Working agent to the port of the support, together With pneumatic means for moving the impacting engine longitudinally toward or from the dies with its port into or out of register with the port ofthe support.

10.` In a mechanism of the class described, the combination With the shaping dies and the support therefor, of an impacting engine, a support in Which said impacting engine is longitudinally movable, said support and said impacting engine having coperative ports, means for admitting Working agent to the port of the support, together With pneumatic means for moving the impacting engine longitudinally toward or from the dies With its port into or out of register With the port of the support, and manually operated means for controlling the action of the pneumatic moving means.

CLARK J. SMITH.

Witnesses:

Mrs. A. L. OER, EMMET A. WORK.

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