US641107A - Machine for grinding drills. - Google Patents

Description

v No. 64l,|07. Patented m. 9, I900. w. c. HEISTER.

MACHINE FUR GRINDING DRILLS.

(Application filed Oct. 7. 1899.)

5 Sheats8heef I.

(No Model.)

Patented Ian. 9, I900.

w. c. HEISTER. MACHINE Fon anmnme DRILLS.

(Application filed. Oct. 7, 1899.)

5 Sheets-Sheet 2.

(No Model.)

I /A/ VENTOH ZQMmLY/[ez BY zhr W/TNESSES A TTOHNEK.

No. 641m. Patentedlan. 9, I900.-

-- w c HEISTER MACHINE FOR GRINDING DRILLS.

(Applicatio n filed Oct. 7, 1899 1 2 5 Sheets-Sheet 3.

(No Model.)

WITNESSES /NVENTOR ATTORNEY.

N0. 64|,|07. Patented Jan. 9, I900.

W C HEISTER MACHINE FOR GRINDING DRILLS.

(Appl e fil :10 t '1 1399 5 Sheets-Sheet 4.

(No Model.)

A TTOHNE Y.

No. 64|,|07. Patented Jan. 9, I900.

W. C. HEISTER. I

MACHINE FUR GRINDING DRILLS.

. (Application filed Oct. 7, 1899.)

(No Model.) 5 Sheets5heett 5.

WITNESSES J lNVE/VTOH A TTOHNE).

Tu: NORRIS PETERS co. PHo'ro-uTHo. WASHINGTON. o. c.

I turn TATES" PATENT Prion.

WILLIAM O. HEISTER, OF DAYTON, OHIO, ASSIGNOR TO THE BUCKEYE IRON- AND BRASS l/VORKS, OF SAME PLACE.

MACHINE FOR GRINDING DRILLS.

SPECIFICATION forming part of Letters Patent No. 641,107,.dated January 9, 1900. Application filed October 7, 1899. Serial No. 732,947. (No model.)

To all whom it may concern: zontally through which is a sleeve 2, that is Be it known that I, WILLIAM G. HEISTER, held fixed in the standard by a set-screw 3. a citizen of the United States, residing at Day- J ournaled in the sleeve is the main or drivton, in the county of Montgomery and State ing shaft 4, on one end of which is fixed a of Ohio, have invented new and useful Imdrive-pulley 5. Journaled in the standard 55 provements in Machines for Grinding Drills, above the driving-shaft is a horizontal shaft of which the following is a specification. 6, driven by a pulley 7, mounted on one end This invention relates to a machine for thereof andhaving fixed on its other end an grinding drills, and has for its object to proemery-wheel S. Projecting from the end of vide, in connection with a grinding-wheel, a the sleeve 2 is a bracket-arm 9, to which is 60 holder for holding the drill and means forimpivotally connected by a bolt 10 a bed or taparting to said holder a combined rotary, osble comprising a hollow box or casing 11, cillating, and reciprocating movement to audovetailed on its upper opposite edges, as at tomatically present both lips ofthe drill to the 12, (see Figs. 6 and 13,) and arranged to slide grinding-wheel at proper varying angleson said bed or table is a carriage 14:, provided 6 5 It also has for its object to provide simple on its upper side with a head 15, in which is means for effecting a very fine adjustment of j ournaled a tubular drill-holder consisting of the parts, whereby the drill will be ground a sleeve 16, formed at its forward end with a with mechanical accuracy, greatly increasing flange 17, which abuts the end of the head 15 both the efficiencyand durability of the drill. and prevents any endwise movement of the It has certain other objects in view, which will holder. A chuck is arranged on the forward hereinafter be made apparent. end of the drill-holder and consists of two To these ends myinvention consists in the jaws 18, arranged to slide in a transverse slot features and in the construction, combinain the end of the sleeve 16 and connected to- 25 tion, and arrangement of parts hereinafter gether by a right-and-left screw 19, which is described, and particularly pointed out in the adapted to be engaged and turned to move claims following the description, reference the jaws toward and'away from each other. being had to the accompanying drawings, The chuck operates to grasp and firmly hold forminga part of this specification, wherein-- the drill to be ground in such manner as to 0 Figure 1 is a view in elevation of my imprevent any play of the drillduring thegrindproved machine. Fig. 2 is a top plan view ing operation. thereof. Fig. 3 is a vertical sectional eleva- The numeral 20 indicates a sleeve which is tion of a partof the same. Fig. 4. is a detail formed to fit snugly within the tubular holder sectional view of the chuck for holding the 16 and is provided with a longitudinally-ta 5 drill. Fig. 5 is a plan view of the table or pered bore 21, into which the rear end of the casing, the carriage being removed. Fig. 6 drill to be ground is fitted, thus firmly hold is a section taken on the line 6 6 of Fig. 5. ing the rear end of the drill in place, the for- Fig. 7 is a transverse sectional view of the ward end of the drill being firmly grasped carriage. Figs. 8 to 11 are detail views of and held by the chuck. Fixed on the end of 40 the sleeve for holding the rear end of the the driving-shaft 4 is a pinion 22, which go drill. Fig. 12 is a sectional view illustrating meshes with a corresponding pinion 23, fixed a modified construction. Fig. 13 is a section ona shaft 24, journaled in bearings 25, formed taken on the line 13 13 of Fig. 12. Fig. 14 is with the box or casing 11, and fixed on the a detail top plan view of the guide-finger, shaft 24: is a gear-Wheel 26, which gears with 5 illustrating the mannerofjointingit; and Fig. a long pinion 27, journaled in the head 15, 5 15 is an end view of the same, illustratingthe and which in turn gears with a gear-wheel manner of setting the drill. 28, fixed on the drill-holder 16 by a screw 29.

Referring to the drawings, the numeral 1 Also fixed on the shaft 24 is a gear-wheel 30', indicates a pillar or standard forming the which gears with a pinion 31 of half its size 50 base or support of the machine, passing horifixed on the end of a shaft 32, journaled in one of the bearings 25 and in a corresponding bearing 33. Fixed on the shaft 32 is aheartshaped cam 34, which rotates in contact with two rollers 35, journaled in a ring 36, provided on its opposite sides with trunnions 37, which are journaled in a yoke 38. with the yoke 38 is a bracket-arm 39, which is rigidly attached to the end of the sleeve 2. Also fixed on the shaft 32 is a beveled pinion 40, which meshes with a corresponding beveled pinion 41, fixed on the end of a short shaft 42, journaled in a suitable bearing in the side of the box or casing 11. On the end of the shaft- 42 is pivoted a heart-shaped cam 43, having an arc-shaped slot 44, formed concentric with said shaft, through which passes a set-screw 45, that screws into-an arm 46, (see Fig. 5,) that is fixed on the shaft 42, by means of which the cam may be adjusted on the shaft in an obvious manner. The cam 43 is arranged to rotate in contact with two rollers 47, journaled in the ends of two short arms 48, pendent from a plate or slide 49, which is adj ustably attached to one side of the carriage 14 by set-screws 50, which pass through slots 51, formed in said plate or slide. The rear end of the plate or slide 49 is provided with a lateral lug 52, (see Fig. 2,) in which is rotatably arranged a hand-screw 53, which screws into the rear end of the carriage 14. By means of the hand-screw the carriage and slide or plate 49 can be adjusted relatively to one another, so as to regulate the throw of the carriage under the action of the cam 43, as will more fully hereinafter appear.

The numeral 55 indicates a downwardcurved guide-finger, which is fitted at its rear end in a socket 56, formed in the end of a bracket-arm 57, pivoted at its rear end to a lug 58, bolted to the head 15 and provided with a foot 59, adapted to rest on the edge of the flange 17. The guide-finger is held in the socket by a set-screw 60, which passes loosely through the rear end of the' guide finger. Arranged in the socket 56 is a follower 55, which is projected forward by a coiled spring 61 and operates to hold the guide-finger in either ofits adjusted positions, as best illustrated in Fig. 14.

The operation of the device constructed as above described is as follows: The drill to be ground is first inserted in the sleeve and the latter is next fitted in the holder 15. The guide-finger is then moved into the position shown in Fig. 1, and the drill is adjusted until its end accurately registers with the end of the guide-finger, and one of its cutting-lips lies in true parallelism with the side of the guide-finger, as shown in Fig. 15, after which the screw 19 is turned to tightly grasp and hold the drill.

It will be understood that in most drills there are two lips or cutting edges arranged diametrically opposite to one another and that in grinding the end of the drill the metal is ground off more and more as the cutting Formed edges or lips are receded from, and in order to accomplish this result as the lip is receded from the drill has to be presented at a more acute angle to the emery-wheel to grind off more metal. There being two such lips, it is necessary to change this angle during each revolution of the drill to grind off from the high to the low portions of the drill, and this result is accomplished by means of the mechanism above described in the following manner: The drill having been set in the holder in the manner described, the guide-finger is thrown backinto the position shown in dotted lines in Fig. 12 and the driving-shaft 4setin motion. The shaft 4 rotates the shaft 24 through the medium of the pinions 22 and 23 and rotates the drill by means of the gears 26, 27, and 28. The gear-wheel being twice the size of the gear-wheel 31, the shaft 32 rotates at twice the speed of the shaft 24, and as the cam 34 rotates between the rollers 35 on the fixed yoke 38 the box or casing 11 is oscillated in the are of a circle about its pivotal point 10, thereby oscillating the point of the drill in a similar arc to vary the angle at which it is presented to the face of the emerywheel 8, and owing to the shafts 24 and 32 being geared together in the manner described the drill is given two complete oscillations while it is rotated once. As the drill is oscillated back and forth in the manner described to vary the angle at which it is presented to the emery-wheel the carriage carrying the drill-holder and drill is reciprocated back and forth by means of the cam 43 r0- tating between the rollers 47, the parts being so timed that as the box or casing is lowered on its pivot the carriage is fed forward to feed forward the drill to compensate for the downward movement of the box or casing and hold the drill in contact with the face of the emeryavheel, and during this move= ment the emery-wheel grinds off the drill away from one of the cutting-lips. As the box or casing is raised the cam 43 operates to draw the carriage back or rearward to com pensate for the forward movement imparted to the drill by such upward movement of the box or casing, As before described, these movements occur twice during each rotation of the drill to grind off each cutting-lip. By means of the hand-screw 53 the carriage may be accurately adjusted relatively to the cam 43 to insure the reciprocating movement of the carriage accurately occu ring in proper relation to the oscillating movement of the box or casing, and by means of said screw the drill may also be fed forward to the emery wheel as the metal is ground off.

In Figs. 12 and 13 I have illustrated a slightly-modified construction. As shown in said figures of drawings, the intermediate pinion before described is dispensed with and the gear-wheel 26 meshes directly with the gear-wheel 28 on the drill-holder. The pinions 22 and 23 are also dispensed with, and the carriage.

shaft 24 is extended and is connected to the driving-shaft 4 by a universal coupling 62 of well-known construction. The shaft 32, gear-wheels and 31, pinions and 41, shaft 42, and cam 43 are also dispensed with, and the cam 34 is mounted directly on the shaft 24. Also mounted on said shaft is a cam-wheel 63, having a spiral cam-groove 64 formed in its periphery, and engaging said cam-groove is a finger 65, pendent from a block 66, which is arranged to slide in ways 67 on the bottom of the carriage. The rear end of the carriage is formed with a vertical flange 68, in which is rotatably arranged a hand-screw 69, which engages a corresponding threaded aperture in the block 66, whereby the block can be adjusted relatively to the The operation of this form of the device will be readily understood. The table or casing 11 will be oscillated and the drill rotated in the manner before described, and the cam 63 will operate through the medium of the finger 65 and block 66 to reciprocate the carriage back and forth in the manner and for the purpose before set forth.

In both forms of the device shown and described the operation of the machine isautomatic throughout and operates to grind both lips of the drill with mechanical accuracy, thereby enabling the drill to cut twice as fast as if one lip only operates to cut. The drill thus ground will bore a uniformly true hole, will keep its edge longer, and bore many more holes than drills ground by hand.

The machine will grind flat and twist drills and drills of all kinds and will give any clearance desired, ranging from twenty-nine and one-half degrees to thirty-seven and one-half degrees.

It will be obvious that many of the details of my invention may be varied or altered without departing from the spirit thereof, and therefore I do not wish to be understood as limiting myself thereto, excepting as hereinafter pointed out in the claims.

In practice the pivot 10 of the hollow box or table 11 should be arranged directly central on the pitch-line of the gears 22 and 23, so that the rocking or oscillating movement of said table will be insufficient to throw the gears out of mesh.

By pivoting the bracket-arm 57 in the manner described said bracket-arm and the guidefinger 55 may be thrown up into the position shown in Fig. 12 in order to give ready ac cess to the screw 19 in adjusting the jaws of the chuck. After the drill has been set by the guide-finger in the manner before described the guide-finger may be swung around to one side, as shown in Fig. l5 where it will be out of the way during the grinding operation. The guide-finger is held in either of its adjusted positions by the spring-follower 55 in an obvious manner.

Having described my invention, what I claim is- 1. In a machine for grinding drills,the combination with a grinding-wheel, of a carriage provided with means for holding the drill, means for oscillating said carriage in the arc of a circle lying in a plane at right angles to the operative face of the grinding-wheel to present the drill at varying angles to the grinding-wheel,and means for simultaneously reciprocating the carriage to compensate for its oscillating movement, substantially as described.

2. In a machine for grinding drills,the combination with a grinding-wheel, of a carriage provided with means for holding the drill, means for oscillating the carriage alternately toward and from the grinding-wheel in the arc of a circle lying in a plane at right angles to the operative face of the grinding-wheel to vary the angle at which the drill is presented thereto, means for reciprocating the carriage toward the grinding-wheel and simultaneously loweringitin the arc of a circle, means for reciprocating the carriage away from the grinding-wheel and simultaneously raising it in the arc of a circle, and means for rotating the drill, substantially as described.

3. In a machine for grinding drills,the combination with a grinding-wheel, of a table, a carriage arranged to reciprocate on the table and provided with means for holding a drill, means for oscillating the table in the arc of a circle to vary the angle at which the drill is presented to the grinding-wheel,and means for reciprocating the carriage on the table toward and from the grinding-wheel and sim ultaneousl y with the oscillating movement of the table, substantially as described and for the purpose specified. y

4. In a machine for grinding drills,the con1- bination with a grinding-wheel, of a pivoted table, a carriage arranged to reciprocate on the table and provided with a rotatable drillholder, means for rotating the drill-holder, means for oscillating the table in the arc of a circle to vary the angle at which the drill is presented to the grinding-wheel,and means for reciprocating the carriage on the table toward and from the grinding-wheel simultaneously with the oscillating movement of the table, substantially as described.

5. In a machine for grinding drills,the combination with a grinding-wheel, of a pivoted table, a carriage arranged to reciprocate on the table and provided with a rotatable drillholder, means for rotating the drill-holder, means for oscillating the table about its pivotal point in the arc of a vertical circle to vary the angle at which the drill is presented to the grinding-wheel, and means for reciprocatin g the carriage toward the grinding wheel as the table is lowered and away from the grinding-wheel as the table is raised, substantially as described and for the purpose specified.

6. In a machine for grinding drills,the combination with a grinding-wheel, of a pivoted table, a carriage arranged to reciprocate on the table and provided with a rotatable drill holder, means for rotating the drill-holder, means for oscillating the table about its pivotal point in the arc of a circle toward and from the grinding-wheel, said means being constructed and arranged to communicate two complete oscillations to the table during each rotation of the drill-holder, and means for reciprocating the carriage toward the grinding-wheel as the table is lowered and in the opposite direction as the table is raised, substantially as described and for the purpose specified.

7. In a machine for grinding drills, the combination with a grinding-wheel, of a pivoted table, a carriage arranged to reciprocate on the table and provided with a rotatable drillholder, means for rotating the drill-holder, means for oscillating the table about its pivotal point in the arc of a circle toward and from the grinding-wheel, said means being constructed and arranged to communicate two complete oscillations to the table during each rotation of the drill-holder, means for reciprocating the carriage toward the grinding-wheel as the table is lowered and in the opposite direction as the table is raised, and means for feeding the carriage toward the grinding-wheel independently of its reciprocating movement, substantially as described.

8. In a machine for grinding drills, the combination with a grinding-wheel, of a pivoted table, a carriage arranged to reciprocate on the table and provided with a rotatable drillholder means for rotating the drill-holder, means for oscillating the table about its pivotal point in the arc of a circle toward and from the grinding-wheel, means for reciprocatin g the carriage toward and from the grinding-wheel simultaneously with the oscillating movement of the table, and means for adjusting the carriage on the table toward and from the grinding-wheel independently of the reciprocating movement of the table, substantially as described.

9. In a machine for grinding drills, the combination with a grinding-wheel, of a pivotal table, a carriage arranged to reciprocate on the table and provided with a rotatable drillholder, means for rotating the drill-holder, means for oscillating the table about its pivotal point in the arc of a circle toward and from the grinding-wheel, means for reciprocating the carriage toward and from the grinding-wheel simultaneously with the oscillating movement of the table, and means operated by hand for adjusting the carriage on the table, substantially as described.

10. In a machine for grinding drills,the combination with a grinding-wheel, of a pivoted table, a driven shaft journaled in the table, a carriage arranged to reciprocate on the table, a rotatable drill-holder journaled on the carriage,a gear-wheel fixed on the drill-holder,

a gear-wheel fixed on the driven shaft and operating to transmit rotary motion from said shaft to the drill-holder, means for oscillating the table about its pivotal point in the arc of a circle toward and from the grinding-Wheel; and means for reciprocating the carriage toward and from the grinding-wheel as the table is lowered and raised, substantially as described and for the purpose specified.

11. In a machine for grinding drills,the combination with a grinding-wheel, of a pivoted table, a driven shaft journaled in the table, a carriage arranged to reciprocate on the table toward and from the grinding-wheel, a rotatable drill-holder journaled on the car riage gearing for transmitting rotary motion from the driven shaft to the drill-holder, and mechanism operated by the driven shaft for imparting to the table an oscillating movement about its pivotal point toward and from the grinding-wheel in the arc of a circle and for simultaneously reciprocating the carriage toward and from the grinding-wheel, substantially as described and for the purpose specified.

12. In a machine for grinding drills,the combination with a grinding-wheel, of a pivoted table, a driven shaft journaled on the table, a carriage arranged to reciprocate on the table toward and from the grinding-wheel, a rotatable drill-holder journaled on the carriage, gearing for transmitting rotary motion from the driven shaft to the drill-holder, mechanism operated by the driven shaft for oscillating the table about its pivot in the arc of a circle toward and from the grindingwheel, a' cam rotated by the driven shaft, and an attachment carried by the carriage and engaging said cam to reciprocate the carriage, substantially as described.

13. In a machine forgrindingdrills,the combination with a grinding-wheel, of a pivoted table, a driven shaft journaled on the table, a carriage arranged to reciprocate on the table toward and from the grinding-wheel, a rotatable drill-holder journaled on the carriage, gearing for transmitting rotary motion from the driven shaft to the drill-holder, mechanism operated by the driven shaft for oscillating the table about its pivot in the arc of a circle toward and from the grindingwheel, a cam rotated by the driven shaft, and a projection adjustably connected with the carriage and engaging said cam to reciprocate the carriage toward and from the grind ing-wheel, substantially as described.

14. In a machine for grinding dril1s,the combination with a grinding-wheel, of a pivoted table, a driven shaft journaled on the table, a carriage arranged to reciprocate on the table toward and from the grinding-wheel, a rotatable drill-holder journaled on the carriage, gearing for transmitting rotary motion from the shaft to the drill-holder, mechanism operated by said shaft for oscillating the table about its pivot in the arc of a circle toward and from the grinding-Wheel, aspirallygrooved cam fixed on the shaft, a block mounted in ways on the carriage, an adj ustingscrew for adjustably fixing the block rela= tively to the table, and a finger carried by said block and engaging the grooved cam to rotatable drill-holder journaled on the carriage, gearing for transmitting rotary motion from the shaft to the drill-holder, a cam fixed.

on said shaft and rotating between fixed antifriction-rollers to oscillate the table in the arc of a circle toward and from the grindingwheel, and means for reciprocating the carriage, substantially as described.

16. Inamachineforgrindingdri1ls,thec01nbination with a grinding-wheel, of a pivoted table, a driven shaft journaled on the table, a carriage arranged to reciprocate on the table toward and from the grinding-wheel, a rotatable drill-holder journaled on the carriage, gearing for transmitting rotary motion from the shaft to the drill-holder, a cam fixed on said shaft, a fixed yoke, a ring swiveled in the yoke and provided with antifrictionrollers engaging theperiphery of the cam to cause the table to oscillate about its pivot in the are of a circle toward and from the grinding-wheel, and means for reciprocating the carriage, substantially as described.

17. In a machine for grinding dri1ls,the combination with a grinding-wheel, of a pivoted table, a driving-shaft journaled on the table, a carriage arranged to reciprocate on the table toward and from the grinding-wheel, a rotatable drill-holder journaled on the carriage and having a gear-wheel fixed thereon, a gearwheel fixed on the driven shaft and gearing with the gear-wheel on the drill-holder to r0- tate the latter, a cam fixed on the shaft and rotating between fixed antifriction-rollers to oscillate the table about its pivot in the arc of a circle toward and from the grinding-wheel, a spirally-grooved cam on the driven shaft, and a finger carried by the carriage and engaging said spiral groove to reciprocate the carriage on the table simultaneously with the oscillating movement of the latter.

18. In a machine for grinding drills,the combination with a grinding-wheel, of a pivoted table, a carriage arranged to reciprocate on the table toward and from the grinding-wheel, means for reciprocating the carriage, means for oscillating the table on its pivot in the arc of a circle toward and from the grindin g-wheel,

a rotatable sleeve journaled on the carriage, a chuck carried on the forward end of the sleeve, and a sleeve fitted in the rear end of the rotatable sleeve and having a tapered bore, substantially as described and for the purpose specified.

19. In a machine for grinding drills,the combination with a grinding-wheel, of a pivoted table,a carriage arranged to reciprocate on the table toward and from the grinding-wheel, means for reciprocating the carriage, means for oscillating the table on its pivot in the arc of a circle toward and from the grinding-wheel, a rotatable sleeve journaled on the carriage, a chuck on the forward end of the sleeve comprising two sliding jaws fitted to move in a transverse slot in the end of the sleeve, a right-and-left screw fitted in said jaws, and means for rotating the sleeve, substantially as described.

20. In a machine for grinding drills,the combination with a grinding-wheel, of a table pivoted at a point in front of and below the grinding-wheel, a carriage arranged to reciprocate on the table toward and from the grinding-wheel, means for reciprocating the carriage, means for oscillating the table on its pivot in the arc of a circle toward and from the grinding-wheel, a rotatable drill-holder j ournaled on the carriage, and a guide for setting the drill in the holder, substantially as described.

21. In a machine forgrindingdrills,the combination with a combined oscillating and reciprocating carriage, of a rotatable drill-holder mounted on the carriage and provided with means for grasping and holding a drill, and a pivoted guide-finger carried by the carriage, for settingthe drill,substantially as described.

22. In a machine for grinding drills,the combination with a combined oscillating andreciprocating carriage, of a rotatable drill-holder mounted on the carriage and provided with means for grasping and holding a drill, and a pivoted guide-finger carried by the carriage, said guide-finger being curved downward at its free end and jointed intermediate its ends,

substantially as described.

In testimony whereof I'have hereunto set my hand in presence of two subscribing witnesses.

WILLIAM C. HEISTER.

lVitnesses:

JOSEPH H. HUBBELL, Orro B. FRANK.

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