US1351969A

US1351969A - Feeding mechanism for metal-working machinery

Info

Publication number: US1351969A
Application number: US198034A
Authority: US
Inventors: Augustus M Sosa; Albert E Robinson; Herman W Schatz
Original assignee: American Tool Works Co
Current assignee: American Tool Works Co
Priority date: 1917-10-23
Filing date: 1917-10-23
Publication date: 1920-09-07
Anticipated expiration: 1937-09-07

Description

A. M. SOSA,. A. E. ROBINSON AND H. W. SCHATZ. FEEDING MECHANISM FOR METAL WORKING MACHINERY.

APPLICATlON FILED OCT. 23, 1917- 1,351,969. Patentedfiept. 7, 1920.

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FEEDINQMECHANISM FOR METAL WORKING MACHINERY. APPLICATION FILED on. 23, 1917.

1,351,969. PatentedSept. 7,1920.

6 SHEETS-SHEET 2.

A. M. SOSA, A. E. ROBINSON AND H. W. SCHATZ.

FEEDING MECHANISM FOR METAL WORKING MACHINERY.

APPLICATION FILED OCT. 23, 1917.

1,351,969, PatentedSept. 7,1920.

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FEEDING MECHANISM FOR METAL WORKlNG MACHINERY.

APPUCATION FiLED OCT. 23. 1917.

1 35 1 969 Patented Sept. 7, 1920.

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FEEDING MECHANISM FOR METAL WORKING MACHINERY. APPLICATION FILED OCT. 23. WW.

1,351,969. PatentedSept. 7, 1920.

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A. M. SOSA, A. E. ROBINSON AND H. W. SCHATZ.

FEEDING MECHANISM FOR METAL WORKING MACHINERY.

APPLICATION FILED OCT. 23, 1917.

1,351,969. PatentedSept. 7, 1920.

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AUGUSTUS M. SOSA AND ALBERT E. ROBINSON. OF CINCINNATI, AND HERMAN W. SCI-IATZ, OF NORWOOD, OHIO, ASSIGNORS TO THE AMERICAN TOOL WORKS COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

FEEDING MECHANISM FOR METAL-WORKING MACHINERY.

Application filed October 23. 1917.

T 0 all whom it may concern:

Be it known that we, AUGUSTUS M. SosA, ALBERT E. ROBINSON, and HERMAN W. SonA'rz, citizens of the United States, the said HERMAN \V. SCHATZ residing at Norwood, in the county of Hamilton and State of Ohio, and the said ALBERT E. ROBINSON and AUoUs'rUs M. SosA residing at Cincinnati, in the county of Hamilton and State of Ohio, have jointly invented certain new and useful Improvements in Feeding Mechanism for Metal-\Vorking Machinery, of which the following is a specification.

Our invention relates to feeding means for axially feeding a tool-spindle in metal working machinery; to means for determining the extent of axial movements of the tool-spindle and for duplications of said movement; and to a safety stop for the feeding means.

Our invention relates further to a socalled tapping attachment for controlling the axial feeds of the tool-spindle in connection with its rotations for cutting threads.

Ye have exemplified our invention as applied in a drilling machine embodying a rotatable axially movable drill-spindle.

It is the object of our invention to provide novel means for combinedly rotating and axially feeding a tool-spindle for performing thread-cutting operations; further, to provide novel means for axially feeding the tool-spindle; further, to provide novel means for selectively controlling the cooperation of the tool-spindle with the thread-cutting means or with the feeding means; further, to provide novel means for connecting and disconnecting the thread-cutting means with relation to the driving means of the toolspindle; further, to provide novel means for controlling the extents of axial movement of the tool-spindle, for instance, the axial feeding or thread-cutting movements thereof, to predetermined depths, and for repeating the predetermined axial movements of the tool spindle; and, further, to novel means for stopping the feeding movement of the toolspindle when at the limit of its path of movement.

The invention will be further readily understood from the following description and claims, and from the drawings, in which latter:

Figure 1 is a front elevation of a drill- Specification of Letters Patent.

Patented Sept. 7, 1920.

Serial No. 198,034.

head, exemplifying our invention, shown in connectlon with a drill-arm, the latter partly brolren away. A I

F g. 2 is a side elevation of the same.

F g. 3 is a plan view of the same.

F1g. 4: 1s a front elevation of the same with the front of the casing and the arm removed.

Fig. 5 is a left side elevation of the same, with the casing of the drill-head and parts partly broken away for better illustration, the casing being partly in vertical section on the l 1ne 5-5 of Fig. 1. i

Fig. 6 is a similar right side elevation of the same, with parts in axial section, taken on the line 66 of Fig. 12.

Fig. 7 is a detail of the means for controlling actuation of the gearing of the tappmg attachment, taken on the line 7-7 of Fig. 12.

Flg. 8 is a plan section, illustrating the clutch operating means of the feeding mechanism, taken in the plane of the line 88 of Fig. 9.

Fig. 9 is a vertical section of the same taken in the plane of the line 99 of Fig. 8.

Fig. 10 is a cross-sectional detail of the same, taken on the line 10--10 of Fig. 9.

Fig. 11 is a vertical section,- taken on the line 11-11 of Fig. 12, andillustrating the means for changing the feeds in the tapping attachment.

Fig. 11 is a rear view detail of the same. Fig. 12 is a cross-section, taken on the line 12-12 of Fig. 4.

Fig. 13 is a cross-section taken on the line 13 13 of Fig. 4.

Fig. 14 is a vertical section, taken on the line 1414 of Fig. 13, and showing the means for changing the feeds of the drillspindle.

Fig. 15 is a horizontal section of the same, taken on the line 15-15 of Fig. 14.

Fig. 16 is an axial section, taken on the line 16-16 of Fig. 4, illustrating the means for controlling the extents of axial movements of the tool-spindle.

Fig. 17 is a plan view of the same, partly broken away.

Fig. 18 is a plan section of the same, taken in the plane of the line 18-18 of Fig. 16.

Fig. 19 is a cross-section of the same. taken in the plane of the line 1919 of Fig. 16.

trolling means for controlling the extent' of axial movement .of the tool-spindle, partly in section in the plane of the line 21--21 of Fig. 17, and illustrating the dial set at zero.

Fig. 22 is a similar view, illustrating the relation of the! parts with the dial set for the limit of feeding movement of one of the divisions of feed.

Fig. 23 is a similar view, with the dial in usual manner, end-

thrust bearings

53, 54, being between the sleeve and spindle. The sleeve is provided with a rack with which a pinion 56 engages for feeding the spindle. (See Figs. 4 and 16). The pinion is fast on a shaft 57, journaled in a bearing 58 in the tool-slide, and having a bushing 59 received thereabout, with which it has rotative connection, as by a key 60. The bushing extends from a face-plate 61. A worm-wheel 64 is provided with a hub 65 serving as a bushing, in which the bushing 59 is journaled, the hub 65 in turn being set at, a position for the beginning of the\ journaled in a bearing 66 in the tool-slide.

second division of feeding movement of the tool-spindle.

Fig. 24 is a similar view, with the dial set for the limit of the! second division of feeding movement of the tool-spindle; and,

Fig. 25 is a similar View showing the relation of the vparts, with the dial at the position of the tripping moment between the divisions of feed.

. We do not herein claim the means for automatically arresting the feeding movements of the tool-spindle, herein shown and described, as the same are shown, described and claimed in an application divisional hereof, Serial No. 277,597, filedby us February 17, 1919. n

The present exemplification of our invention is shown as applied to a metal drilling machine, so much of a metal drilling machine being shown as is necessary to illustrate our invention. I

[A tool-arm- 31 has a tool-head 32 laterally slidable thereon on guides 33, in any ordinary or well-known manner, as by means of a hand-wheel 34, which operates a suitable pinion coacting with a rack 35 extendinglengthwise ofthe tool-arm. The

tool-arm is arranged to be raised and lowered on a suitable column in any usual manner. The tool-head has a tool-spindle 37 therein. 1 1

Suitable means are provided for rotating the tool-spindle, which may be accomplished by means of a shaft 38, (see Figs. 2 and 3), extending lengthwise of the tool-arm and operated in suitable manner from the col- It is arranged to operate suitable gearing in a housing 41 for selectively rotating a gear 42 on an upright shaft 43 in opposite directions. The gear 42 meshes with a gear 44 fast on a bushing 45 journaled in a bearin 46 in the casing 47 of the tool-head. ee Fig. 4.) The bushing has spline-connection 48 with the spindle for rotating the; spindle with the gear, regardless of the elevation or axial movement of the spindle.

A sleeve 51 surrounds the spindle and moves axially in a bearing 52 of the casing. The spindle rotates in the sleeve, and the sleeve is held non-rotatingly in the bearing,

The face-plate has arms 67 pivoted thereto at 68, for quick positioning of the spindle'axially. The arms are articulated at 69 with an axially movable stub shaft 7 O having a cam-key 71 thereon, arranged to engage a lever 72 for actuating a friction-band 73 of a friction-clutch for fixing the wormwheel 64 and face-plate 61 together, when it is desired to feed the spindle by means of the Worm-wheel. The friction-band 73 .is moved radially by operation of any one of the operating levers 67 outwardly for engaging the clutch, any one of said arms being movable inwardly for disengaging the clutch to manually move the drill-spindle axially, the clutch being operated by any one of said arms which may bewithin most convenient reach of the operator, in the same direction, for producinga given result.

The pinion 56 is arranged to be rotatedWOO by means of the worm-wheel or by means of the face-plate, and the worm-wheel is arranged to be rotated manually or by a plurality of speed-varying devices, one of which comprises a so-called tapping attachment, and the other of which is a feeding device, means being provided for selectively and independently connecting the tapping attachment or the feeding device with the worm-wheel, and further means being provided for disconnecting the tapping attachment from its operating means during disconnection of the tapping attachment from the spindle, so as to cause the tapping attachment to remain in a state of rest during the times that the tapping attachment is 7 not actually! in use, so as to prevent wear of the parts. Extreme accuracy is required in a tapping attachment, so that predetermined axial feed of the spindle with relation to speed of rotation thereof may be ,maintained throughout substantially the life of the machine for maintaining accuracy in the machine throughout a long period of time when cutting threads or per forming similar duties.

Instancing the means for performing these duties, cofiperatingnests of gears 7 5, 76, are provided. The nest of gears 75 comprises gears of different diameters arranged stepwise and fixed to a shaft 77 journaled in bearings 78 of the casing. (See Figs. 4, 5, 6, l1 and 12.) The nest of gears 76 comprises gears of different diameters arranged stepwise oppositely to the gears of the nest of gears and meshing with the latter.

The bushing 45 about the spindle is provided with a gear 79 fast thereon. A studshaft 80 is fixed in a bearing 81 of the easing and extends upwardly. (See also Fig. 7). It has a sleeve 82 thereabout, which is arranged to be moved axially'by means of a fork 83, the tines of which are received in an annular groove 84 in said sleeve. The fork is fixed to an axially movable rod 85, slidable endwise in a bearing 86, and having a rack 87 thereon. The rack is engaged by a pinion 88 cut in a shaft 89, journaled in a bearing 90 of the casing, and having a hand-Wheel 91 fixed thereon, the hand-wheel extending outside the casing for manually moving the sleeve.

A gear 95 is fast withthe sleeve 82 and is arranged to mesh the gear 79 about the spindle. A pinion 96 is also fast with the sleeve and is arranged to mesh with the upper one of the gears of the nest of gears 75. The sleeve 82 is normally in upward position, and when in such position its gear 95 is out of mesh with the gear 79, and its pinion 96 is out of mesh with the upper one of the nest of gears 75. When it is desired to use the tapping attachment, the handwheel 91 is turned for causing descent of said sleeve, which causes meshing of the gear 95 with the gear 79, and of the pinion 96 with the upper gear of the nest of gears 75, for rotating said nest of gears in definite relation to the speed of rotation of the spindle.

The gears of the nest of gears 76 are normally loose about a bushing 101, rotatable in bearings 102 of the casing. An axially movable rod 103 is slidable in the bushing,

and has a retractable key 104, hereinafter referred to as a pivoted key, the key being pivoted in a slot 105 in said rod. The bushing is provided with a slot 106 extending lengthwise thereof, and the respective gears of the nest 76 are provided with key-slots 107. The pivoted key is normally urged toward said key-slots by means of a spring 108 which the key engages, four different speeds of transmission being instant-ed, which speeds may be multiplied a suitable number of times by means of any suitable speed varying devices acting on, the spindle, or in any other suitable manner.

T he rod for the pivoted ke is provided with an annular rack 112, Wit the teeth of which a pinion 113 engages, the pinion being fast on a shaft 114 journaled in a bearing 115 of the casing, and having a handwheel 116 thereon, an index-plate 117 being fast with said hand-wheel and arranged to coact with a pointer 118 on the outside of the casing for indicatlng the gear with which the pivoted-key engages at any given position of the hand-wheel, or the speed conveyed thereby. (See Figs. 4, 5, 6, 11, 11 and 12.) A gear 121 is fixed to the bushing and meshes with a gear 122 fixed to a shaft 123 journaled in bearings 124 in the casing, and having a gear 125 fast thereon (see F gs. 5, 6, 11 and 12). The gear 125 meshes with a gear 126 rotatable on a stud-shaft 127 fixed in a bearing 128 of the casing. (See Figs. 6, 12 and 13.)

The means for feeding the spindle axially I are exemplified as a pair of nests of

gears

131, 132, the gears of which normally rotate loosely respectively about bushings 133, 134, journaled in

bearings

135, 136, in the drill-head. (See Figs. 4, 5, and 14.) A gear 137 meshes with a gear 138 rotating with the drill-spindle, being shown as fixed to the bushing 45 about the drill-spindle. (See also Fig. 13.)

A gear 141 is provided with a hub 142 journaled in the upper bearing 135. The gear 137 is fixed tothe hub 142 as by a screw 143. The bushing 133 is journaled in the bore of said hub. Sets of

gears

145, 146 and 147, are loosely journaled about the bushing 133, each of the sets of gears comprising a larger gear and a smaller gear, fixed together as; by a key 148. A gear 149 is fixed to the bushing. The sets of gears are located between the combined gears 137, 141 and the gear 149. Rings 151 are located in annular grooves 152 between the proximate sets of gears and between the sets of gears and the combined gears 137, 14]. and gear 1.49.

The bushing 133 is provided with a slot 154 extending lengthwise thereof, and the hub 142 and the respective sets of gears are provided with key-slots 155. A retractable key 156, shown as a pivoted key, is pivoted at 157 in a slot 158 of an axially movable rod 159. It is arranged to be normally pressed into coaction with the key-slots 155 by a spring 161 fixed to the axially movable rod. When the pivoted key is in engagement with hub 142, the bushing 133 is caused to rotate with the hub, and when the pivoted key is in engagement with one of the gears, the bush mg is caused to rotate with the set of gears so engaged, for transmitting variable speeds to the gear 149. The ends of the pivoted key are provided with slanting faces for ready disengagement from the key-slots when engaging the rings.

Sets of gears 165, 166, 167, are journaled normally loose about the bushing 134, and an additional gear 168 is also journaled normally loose about said bushing. The sets of gears respectively comprise a smaller gear and a larger gear, fixed together. Rings 169 are located in annular grooves 170 between said sets of gears, and at the respective ends of said group of sets of gears. A gear 171 is fixed to the bushing 134 and meshes with the gear 149. The gear 171 also meshes with a gear 172 rotatable on a,

stud-shaft 173, fixed in a bearing 174 of the casing. The gear 172 is located in substantial endwise relation with the gear 126.

The bushing 134 is provided with a slot 175, extending lengthwise thereof, and the respective sets of gears 165, 166, 167, and the gear 168, are provided with key-slots 176.

A retractable key 178, shown as a pivoted key, is pivoted at 179 in a slot 1860f an axially movable rod 181. It is arranged to be normally pressed into coaction with the key-slots in the sets of gears, by means of a spring 182 fixed to the axially movable rod. y

when the pivoted key is in engagement with one of the sets of gears or the gear 168 about the bushing 134, it is caused to rotate with the bushing, for transmitting the speed of a rotation thereof through the bushing to a gear 171 fixed to said bushing. The slot 175 is extended beyond the sets of gears so that the pivoted key 178 may be moved into idle .relation with all the gears about the bushthe bushing 133 mesh with the gears of smaller diameter of the sets of gears about the bushing 134, and vice versa, the upper end one of the group of sets of gears about the bushing 134 being meshed by the gear 141, andthe lower end one of the group of sets of gears about the bushing 133 being meshed by the gear 168.

The gear 137 is exemplifiedas the drivinggear, and rotates with the gear 141, which meshes with the larger gear of the set of gears 165, transmitting rotation to said set of gears, which in turn transmits rotation at a diminished speed to the set of gears 145, decreasing speeds of rotation being successively transmitted to the sets of

gears

166, 146, 167, 147, the set of gears 147 rotating the separate gear 168.

The speeds of the single gears and of the respective sets of gears are different, so that ifmotiou is transmitted from any one of said single gears or sets of gears to the respective, bushings, the result will be a given speed, and if motion is transmitted through any other of said single gears or sets of gears to said respective bushings, the result will be a different speed.

The gears about the respective bushings 133 and 134 are arranged to be selectively alternately connected with said respective bushings, means being provided so that if connection is made between one of the bushings and a gear or set of gears thereabout, the engagement between the pivoted key of the other of said bushings and the gear or sets of gears thereabout is automatically released, and vice versa. For this reason the sets of gears about the respective bushings are arranged in lapping relation to each other, and the rings about the respective bushings are also arranged in off-set relation to each other, so that when one of the pivoted keys is caused to engage a key-slot, this engagement can take place only during disengaged relation of the other of said pivoted keys with all key-slots coacting therewith.

cans are also provided for simultaneously actuating the pivoted-keys, instanced as comprising a hand-wheel 185 fixed to a shaft 186 journaled in a bearing 187 of the casing, an index-plate 188 being fixed to rotate with said hand-wheel, the indicating marks thereon being caused to register with a coactin pointer 189 on the outside of the casing. he shaft 186 has a bevel-gear 190 thereon, which meshes with a bevel-gear 191 fixed to a shaft 192 journaled in bearings 193 of the casing, and having

pinions

194, 195, thereon which respectively mesh with

annular racks

196, 197, on the

respective rods

159, 181. A finger 198 on the shaft 186 coacts with a stop-pin 199 on the bearing 187-to limit turning of the shaft 186 to maintain the circular racks in engagement with the pinions.

When bw the hand-wheel 185 is turned to move he axially

movable rods

159, 181, both the pivoted-keys will bemoved axially with the rods. Assuming that the pivotedkey 156 engages the key-slot ingear 141, the

transmission of motion will be from the gear 137 through the hub 142, which transmits motion to the bushing 133, this bushing transmitting motion to the gear 149 fixed thereon, which meshes with the gear 171, and in turn rotates the gear 172. The rest of the gears of the nests of gears run idle.

By this means a feed which may be instanced as .040 inches per revolution of the drill-spindle may be obtained. If it is desired to change the ratio of axial feed of rotation of the drill-spindle, exemplified as a decreasing feed, the pivoted-keys are simultaneously caused to descend, by operation of the hand-wheel 185, for engaging the pivoted-key 178 with the key-slot of the set of gears 165, whereby the transmission of motion is through the gear 137, the hub 142, the gear 141, and the set of gears 165, which act on the key 178 for rotating the bushing 134, which rotates the gear 171 and in turn rotates thegear 172, resulting in a feed instanced as .029 inches per revolution of the drill-spindle.

Other desired changes may be had by causing further axial movement'of the rods on which the pivoted-keys are mounted, for obtaining, for instance, successively .022,

.016, .012, .009, .007, and .005, inches in the feeding movement of the drill-spindle per revolution of the same.

In the present exemplification, eight different speeds of axial feed of the dr1llspindle may be obtained, by means which take up little space and are easily operated, and

the speeds of which are changedwithout danger of locking of gears or of parts that might result in breakage of elements. The speeds obtained may be multiplied by speed varying means varying the speed of the drill-spindle.

The gear 126 is the power-delivering gear of the tapping attachment, and the gear 17 2 is the power-delivering gear of the feeding mechanism. There is a space 201 between said gears. The

gears

126, 172, are arranged to be selectively meshed by a gear 202 having spline-connection 203 with a shaft 204 journaled in a bearing 205 in the casing. (See Figs. 4, 5, 6, 13 and 14.) The gear 202 is arranged to be moved axially, as by having a'hub 206 thereon, which has a sleeve 207 thereabout in which the hub is journaled. The sleeve slides axially in a bearing 208. The sleeve is fixed axially with relation to said gear by being received about said hub between the gear proper and a collar 209 fixed to the hub. The sleeve is provided with a rack 210. It is also provided with a slot 211 lengthwise thereof, in which a pin 212 received through the bearing of the sleeve is received. A pinion 213 meshes with the rack, and is on a shaft 216 journaled in a bearing 214 of the casing and has a hand-wheel 215 thereon for turning the same.

When the hand-wheel is turned in one direction, the gear 202 will be caused to be disengaged from the gear 172 and to engage with the gear 126, causing the tapping attachment to be in train with the feed-shaft 204. When the hand-wheel is turned in the opposite direction, the gear 202 is caused to disengage from the gear 126 and to engage with the gear 172, for causing the speed varying means of the feeding attachment to be in train with said feed-shaft 20.4.

The shaft 204 is arranged to operate a worm 218, whichmeshes with the Wormwheel 64, through the medium either of the tapping attachment gears, or of the feeding gears. (See Figs. 4, Sand 16.) The worm is also arranged to be operated by manual means, instanced as accomplished by means of a hand-wheel 219 fixed to a shaft 220, journaled in a bearing 221 of the casing, the shaft being held lengthwise in said bearing between said hand-wheel and a collar 222 fixed to said shaft. The lower end of the shaft 204 is journaled in a bore 223 in the worm. The shaft 204 is held lengthwise in a bearing 205 between collars 224, 225, fixed to said shaft, the collars 224, 225, engaging the bearing 205.

If it is desired to operate the worm by hand, the shaft 204 is disconnected from the worm 218. This is accomplished by means of a clutch 226, shown as a toothclutch, the teeth being respectively on the Worm and on a collar 227, having splineconnection 228 with the shaft 204. A fork 229 is received in annular groove 230 in said collar, and is fixed to a rock-shaft 231 journaled in a bearing 232 of the casing, and having an operating arm 233 secured thereto.

It is often desirable to cause repeated axial movements of the tool-spindle to given extents, for instance when tapping threads, or boring holes, the extents of these axial movements sometimes varyin greatly. These axial feeds by the tapping attachment and by the feeding means, are accomplished in the present exemplification by means of the worm 218 and worm-wheel 64. The worm wheel acts on the pinion 56 for rotating the same and feeding the spindle axially. It may be instanced that a single revolution of the pinion 56 will feed the tool-spindle approximately six inches.

It often happens that a greater axial feed than is accomplished by an approximately single rotation of the pinion, is desired. Means are provided in the present exemplification for causing stoppage of the axial feed at any point during a single rotation of the worm-wheel, or pinion, or during a plurality of said rotations. The stoppage of the feed, in the present exemplification, is accomplished by disengagement ofthe clutch 226.

For accomplishing these purposes, I provide the index-plate with a plurality of

indexes

237, 238, instanced ason an indexring 239 adjustable with relation to the pinion and index-plate. (See Figs. 4, 16 and 17.) The ring in the present instance is rotatable on a journal-face 240 of the body of the index-plate, and is arranged to be clamped in adjusted radial positions thereon by means of a clamp, which comprises a stem 242 axially movable in a hearing 243 of the body of the index-plate, and having a shoe 244 thereon, the clampmg face of the shoe coacting with an annular inclined face 245 at the rear of the indexring, which latter is clamped against an annular flange 246 on the body of the indexplate. The outer end of the stem 13 screwthreaded, for having threaded en agement made therewith by a handle 247. K thimble 248 surrounds said stem, a spring 249 being in the bore of said thimble about said stem, for urging release between the clamp and the index-rlng.

The rear face of the index-ring is provided with a knock-off shoe 251 and with a tripper-pin 252, the tripper-pin being instanced as projecting rearwardly farther than the knock-off shoe. (See Figs. 16, 17, 18, and 21 to 25 inclusive.)

A sleeve 253 has axial movement in a bearing 254 of the tool-head, and has a rack 255 thereon, which engages a segment rack 256, on-a segment-arm 257, secured to the rock-shaft 231. This rock-shaft is the shaft which has the operating arm 233 and the fork 229 thereon, the fork engaging the clutch-collar 227 of the clutch 226, for engaging or disengaging the clutch. The segment-arm is provided with a pin 261 fixed therein, the pin being provided with an apex 262 formed by oppositely sloping faces. A bore 264 in the tool-head and is moved toward the pin 261 by means of a spring 265. The pin 263 is provided with an apex 266 formed by oppositely sloping faces, the

apices

262 and 266 coacting with each other and their opposed sloping faces, for causing quick completion of the engagement or disengagement of the clutch when the apex 262 has passed the apex 266.

When the segment-arm has been moved sufliciently to cause the opposed sloping faces on the pins to relatively slide, so as to bring the apices of the respective pins into line, a slight further movement of the segment-arm will cause coaction of the o posite faces of said apices and a quick roc ing movement of the segment-arm in its moving direction for either engaging or releasing the clutch 226 with a quick movement. v

The sleeve 253 has an axially movable and rockable shank 269 therein. This shank is provided with a gage-finger 270, whichis provided with an index-mark or marks, a plurality of the index-marks being provided when a plurality of the indexes on the index-ring are employed. Thus the finger is provided with an index-mark 271,

pin 263 is axially movable 1n a.

which coacts with the index'237, and with an index-mark 272, which coacts with the index 238. It also has a handle 273 thereon for moving the shank. The shank is journaled in a bearing 274 of the casing and in the bore 275 of sleeve 253. Ithas a collar 276 thereon which is fixed thereto, as by a pin 277, the collar being provided with a shoe 278, eccentric on the collar. The shoe 27 8 is shown as having an outer curved face upon which one of the inclined faces of the shoe 251 is arranged to ride, the parts being so arranged that when the apex of the shoe 251 coacts with the outermost point on the shoe 278, the apex 262 will register with the apex 266, so as to cause the apex 262 to pass across the apex 266 at the moment of correlation between the apices of the

shoes

251, 27 8, whereby the clutch 226 is instantly disengaged, for stopping the rotation of the feeding means for the toolspindle.

In the present exemplification, the outer index is caused-to index during a single revolution of the pinion 56, this outer index being instanced as indexing depths of feedof the tool-spindle from zero to six inches. Throughout this range of feeds, rotary movement of the shank 269 is not required, infact the shank might be dispensed with and the shoe 278 fixed directly to the part carrying the segment-rack 255.

If it is desired to repeat axial movement of the tool-spindle of a given extent or depth, the tool-spindle is in practice fed axially to a given point, exemplified, for instance, by the point of engagement of the point of the tool 280 with the surface of the work, instanced at 281, the axial feeding of the tool being then stopped. (See Fig. 2.) The index-ring is then unclamped from the body of the index-plate and rotated, for instance by grasping the finger-knob 282 thereon, until the index-mark 271 registers with the mark on the index 237, which indicates the desired depth of cut or axial movement of the tool-spindle, whereupon the clamp is again operated for clamping the index-ring to the body of the indexplate for causing the index-ring to move with the body of the index-plate. This movement is in the direction of the arrow 02.

The feeding of the drill into the material is then begun, the index-plate, including its ring, rotating with the pinion 56 and the worm-wheel 64, until the zero mark on the index 237 registers with the index-mark 271, at which moment the apex of the shoe 251 registers with the apex of the shoe 27 8, and the

apices

262, 266, of the

pins

261, 263, are at" the point of passage to cause quick tripping movement of the segment-rack by means of the springs and consequent disengagement of the clutch 226. The operation may thereupon be repeated 'as many times as desired without change of relation in the index means, for again causing a similar feeding movement at the same portion of the axial movement of the tool-spindle.

If it is desired to obtain an axial movement of the tool-spindle greater than the circumferential pitch line of the inion 56, the index 238 is employed, the point of the tool being again brought to contact-position on the work. The lndex-ring being unclamped, it is turned until the desired depth of cut or axial movement of the tool-spindle is indicated on the inner index 238 in line with the index mark 272, whereupon the index-ring is again clamped to the body of the index-plate. The handle 273 is then moved outwardly and turned to cause an axial and a rocklng movement of the shank 269. The collar 276 is provided with a tongue 283 which normally lies in a groove 284 in'an enlargement 285 of the sleeve 253. The axial movement of the shank 269 moves the collar and sleeve forwardly into the position shown in Fig. 17. The rocking movement of the shank causes the tongue to lie crosswise of the groove, the collar and handle being turned into the assumed positions shown in Figs. 23 and 24. This turning of the shank also moves the shoe 278, whichis eccentrically placed on the shank, out of the path of the shoe 251.

Fig. 23 indicates the position and relation of the parts of the knock-ofi' shoe and pin when the feed is set for example at a depth to correspond to.the beginning of the markings of the inner index, instanced as a feed of 6.001 inches.

In Fig. 24 the parts and the relation of the shoe and pin are indicated to represent a maximum feed within the capacity of the inner index, and is instanced as a feed of a depth of twelve inches.

The collar is provided with a tripper-finger 287. When the index is set for an indication requiring more than one revolution of the index-plate to trip the clutch in order to cause cessation of feeding movement, the pin 252 will, at approximately the first arrival of the zero mark of index 237 at the index-mark 271, strike the finger 287 and cause rotation of the collar 276, and the shank 269, for placing the shoe 278 in the path of the shoe 251, this relation of parts being shown in Fig. 25, it being understood that when the said collar has been rocked, as shown in Figs. 23 and 24, that the shoe 278 is out of registry with the path of movement of the shoe 251. When the indexplate completes its final rotation, the shoe 251 will coact with the shoe 27 8, and thereby move the shank 269 inwardly and cause inward movement of the rack 255 for rocking the segment-rack 256 and disengaging the clutch 226.

It will be noted that there is a space 289 between the zero mark and the highest mark on the outer index, and a space 290 between the lowest mark and the highest mark of the inner index. These spaces represent the difference between the pitchline circumference of the pinion 56 and a whole number. Thus, if a complete revolution of the pinion 56 represents an axial travel of the tool-spindle of a fraction more than six inches, the spaces represent the fraction, which forms a ga in the index, the gap being compensate by the space 291 between the index-marks 271,272, which would represent the angular travel of the index-plate through said fractional space, the angular distance between the indexmarks 271,272, bridging said

spaces

289, 290.

The shank is provided with a screw 292 which is slidable in a slot 293 in the racksleeve, the slot having a portion which is parallel with the axis of the shank, and a portion which is at right angles thereto, the relations of the parts being preferably such that the axially extended relation of the shank and sleeve is maintained by contact of the head of the screw with the right angular portion of the wall of said slot, for relieving the frictional engagement between the tongue of the collar and the outer face of the enlarged portion of the racksleeve. A spring 294, the ends of which are respectively secured to

pins

295 and 296, respectively in a bore 297 of the shank and the bore 275 in said rack-sleeve, normally draws the shank inwardly.

Safety means are also provided for stopping the axial feed of the tool-spindle. (See Figs. 8, 9 and 10.) Thus the rock-shaft 231 is provided with a bore 301 in which a rod 302 is axially movable. The racksleeve of the spindle is provided with a bracket 303 having a cam-face 304 thereon. The rod has a pin 305 fixed therein transversely thereof. The pin is fixed to a collar 309 slidable on the rock-shaft 231. The pin slides in a slot 306 in the rock-shaft and is arranged to impinge a cam-face 307 on a cam-block 310 fixed to the drill-head, when the rod 302 is moved axially by the camface 304, which occurs when the drill-spindle has reached its desired lowermost limit of movement, whereby the shaft 231 is rocked by movement of the pin 305 along the cam-face 307, for disengaging the clutch 226 and stopping the feed of the spindle. A spring 308 normally urges the rod 302 toward the cam-face 304.

It is obvious that changes may be made in the exemplifications hereinbefore described within the scope of the appended claims, without departing from our invention.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent, is:

1. In a metal drilling machine, the combination of a drill-spindle, means for rotating the same, a gear rotating with said drill-spindle, a variable speed gearing arspeed gearing and into coactive relation with the same.

2. In a metal drilling machine, the combination of a drill-spindle, means for rotating the same, a pair of gears received about and rotating with said drill-spindle, a pair a of nests of gears of dilferent diameters and a driven gear, a pair of nests of gears of different diameters and a .drlven gear,

means for axially feeding said spindle comprising a driving gear arranged to be se lectively meshed with said respective driven gears, and an axially movable gear for causing operative connection between one of said first-named gears about said drill-spindle and said first-named pair of nests of gears and release of said driving connection, the other of said firstnamed gears having operative connection with said secondnamed pair of nests of gears.

3. In metal working machinery, the combination of a tool-spindle, and feeding means for said tool-spindle comprising a plurality of nests of gears respectively comprising a plurality of sets of gears respectively composed of gears of diiierent diameters connected for rotating together, said sets of gears of said respective nests of gears arranged in axial alinement, said sets of gears of said collective nests of gears operatively connected in offset relations lengthwise of the axes of said nests of gears for transmitting different speeds to one .another, and means causing driving relation selectively in said respective nests of gears.

4. In metal working machinery, the combination of a tool-spindle, and feeding means for said tool-spindle comprising a plurality of nests of gears respectively comprising sets of gears composed of gears of different diameters connected for rotating together, said sets of gears of said respective nests of gears arranged in axial alinement, said sets of gears of said collective nests of gears operatively connected in onset relations in directions lengthwise of the axes of said gears for transmitting different speeds to one another, connecting means for each of said nestsof gears, diverting means therefor, and means for simultaneously axially moving said connecting means, said diverting means in said respective nests of gears arranged in offset relation.

5. In feeding mechanism of the character described, the combination of a tool-spindle, means for rotating said tool-spindle, and means for axially feeding said tool-spindle comprising a plurality of nests of gears, said respective nests of gears comprising sets of gears of different diameters, the sets of gears of said nests of gears arranged in axially offset relation for causing driving sconnection between said sets of gears of different nests of gears, and simultaneously movable means for causing operative relation in said respective nests of gears.

6; In feeding mechanism of the character described, the combination of a tool-spindle, and means for axially feeding said toolspindle comprising a plurality of nests of gears, said respective nests of gears comprising sets of gears of different diameters rotating together, said sets of gears of each of said nests of gears arranged in axial alinement, the sets of gears of said collective nests of gears arranged in offset relations in directions lengthwise of the axes of said gears for causing driving connection between said sets of gears of'different nests of gears, and simultaneously movable means alternately connecting with the sets of gears of different nests of gears for transmitting different speeds.

7. In feeding mechanism of the character described, the combination of a tool-spindle, means for rotating said tool-spindle, and

means for axially feeding said tool spindle gears of said respective nests of gears, and

means causing operative connection with said respective sets of gears alternately in said respective nests of gears.

8. In feeding mechanism for metal working machinery, the combination of a toolspindle, and means for axially feeding said tool-spindle comprising a pair of bushings, sets of gears of different diameters the gears whereof are connected together, said sets of gears journaled about said respective bushings and arranged in offset meshing relations progressively in directions lengthwise of the axes of said gears, simultaneously axially movable means in said bushings alternately connecting said respective bushings selectively with the sets of gears thereabout, and means for transmitting the resultant speed into axial feeding movement of said tool-spindle.

9. In feeding mechanism for metal working machinery, the combination of a toolspindle, and means for axially feeding said tool-spindle comprising a pair of bushings, a plurality of sets of gears each composed of gears of different diameters journaled about said respective bushings and relativel arranged in ofi'set meshing relations in irections lengthwise of the axes of said gears, a pair of axially movable rods in said bushings, means for simultaneously axially moving said rods, and means moved by said respective rods alternately connecting said respective bushings with a selective one of the sets of gears thereabout.

10. In feeding mechanism of the character described, the combination of an axially feedable tool-spindle, a plurality of bushings, nests of gears, each of said nests of gearscomprising sets of gears of different diameters journaled about'said respective bushings and arranged relatively in axially offset meshing relation, axially movable rods in said respective bushings, means for simultaneously axially moving said rods, connecting means for said respective rods selectively connecting said respective bushings and the respective sets of gears thereabout, said last-named means including means for causing simultaneous connection in one of said nests of gears and freedom of connection in another of said nests of gears, and means operatively connecting one of said elements with said tool-spindle for axially feeding the same.

11. In feeding mechanismof the character described, the combination of an axially feedable tool-spindle, a pair of bushings, nests of gears about said respective bushings, said respective nests of gears comprising axially alined sets of gears composed of gears of different diameters, said sets of gears of said nests of gears arranged in axially ofiset meshing relation, gears at opposite ends of said respective nests of gears having meshing relation with the respective end ones of the sets of gears of the other of said nests of gears, said gears normally rotatable about said bushings, means causing operative connection alternately between said respective bushings and the gears normally rotatable thereabout, and a gear fixed to each of said bushings, said last-named gears having meshing relation, constructed and arranged for transmitting selective speeds of feed to said tool-spindle.

12. In feeding mechanism of the character described, the combination of a tool-.

spindle, and means for axially feeding said tool-spindle comprising a pair of nests of gears, each of said nests of gears comprising a series of sets of gears of different diameters in axial alinement with each other, the sets of gears of said nests of gears arranged in relatively ofi'set meshing relation for transmitting motion alternately to the sets of gears of said respective nests of gears, a bushing for each of said nests of gears about which the gears thereof are for simultaneously rotating said pinions for slmultaneous axial movement of said rods.

13. In feeding mechanism of the character described, the combination of a toolspindle, and means for axially feeding said tool-spindle comprising a pair of bushings, sets of gears of different diameters rotatable together arranged in axial alinement normally loose about said respective bushings, said sets of gears about said respective bushings arranged in axially offset meshing relation, a single gear normally loose about each of said bushings, said single gears located at the respective ends of said sets of gears about said respective spindles, and simultaneously movable means in each of said bushings for connecting said bushings selectively with said respective gears thereabout, said last-named means acting alternately for forming said connections, and means to transmit various speeds to axially feed the tool-spindle.

14. In feeding mechanism of the character described, the combination of a toolspindle, a pair of bushings, a nest of gears about each of said bushings, each of said nests of gears comprising sets of gears of different diameters arranged in axial alinement and a single gear at opposite ends of said sets of gears, said sets of gears of said nests of gears arranged inoffset meshing arrangement with said single gears meshing with the offset ones of said sets of gears at the respective ends of said respective nests of gears, means for selectively connecting said respective sets of gears and said single gears with said respective bushings, a gear fixed to each of said bushings and having meshing relation with each other, and driving means between one of said gears and said spindle for axially feeding said spindle at selective speeds determined by said connections with said respective bushings.

15. In a drilling machine, the combination of a drill-spindle, means for rotating the same, variable speed gearing comprising a driven gear, means for selectively rotating said variable speed gearing, variable speed gearing comprising a driven gear located below said first-named driven gear, a feedshaft having operative connection With the drill-spindle for axially feeding the same, a gear thereabout having operative connecsaid variable speed gearing, variable s ee gearing comprising a driven gear, said astnamed driven gear located below said firstnamed driven gear and spaced therefrom, a feed-shaft having operative connection with lengthwise movable means for combinedly operating the same, and means for transmitting the resultant speed into axial feeding movement of said tool-s indle.

19. In feeding mechanism for metal working machinery, the combination of a toolspindle, and means for axially feeding said tool-spindle comprising a pair of bushings, nests of gears of different diameters journaled thereabout, the gears of said respective nests of gears meshing with one another to transmit progressively varying speeds, means comprising an axially movable memsaid drill-spindle for axially feeding the ber in each of said bushings for selectively same, a gear about said feed-shaft for driving the same, said gear comprising a hub, a sleeve in which said hub is rotatable, said sleeve having a rack thereon, a pinion meshing with said rack, and an operating handle therefor for moving said last-named gear axially selectively into mesh with said respective spaced apart driven gears.

17. In feeding mechanism for metal working machinery, the combination of a toolspindle, a plurality of nests of gears arranged for transmitting various speeds alternately from a gear of one of said nests of gears to a gear of another of said nests of gears a plurality of times in crossing relation, a plurality of lengthwise shiftable members comprising means connecting alternately with the gears of said respegtivc nests of gears for transmitting said speed changes, and a single manual means having operative connection with each of said lengthwise shiftable members, and means for converting said speeds into axial feeding movement of said tool-spindle.

18. In feeding mechanism for metal working machinery, the combination of a toolspindle, and means for axially feedin said tool-spindle comprising a pair of bus ings, sets of gears of different diameters journaled about said respective bushings, the gears of said sets of gears alternately meshing with each other for rotating said gears of successive sets at progressively difi'erent speeds, lengthwise movable means in said respective bushings for connecting said respective bushings alternately with the gears of said respective sets of gears, a single'manual operating part connecting with both said alternately connecting the gears of said respective nests of gears with said respective bushings, and means for combinedly moving said last-named means for alternately connecting the gears of said respective nests of gears and said bushings.

20. In a drilling machine, the combination of an axially feedable tool-spindle, a racksleeve therefor, a pinion for the latter, a worm-wheel for drlving said pinion, a rotatable part having connection with said pinion, a friction-clutch comprising a radially movable friction-part between said rotatable part and said worm-wheel, and means for moving said radially movable friction part comprising a lengthwise movable actuating part, and a plurality of operating levers pivoted to said rotatable part and having operative connection with said lengthwise movable actuating part for moving said lengthwise movable actuating part in one direction by manual movement of either I of said respective operating levers inwardly and for moving said lengthwise movable actuating part in opposite direction by manual movement of either of said respective operating levers outwardly, said operating levers rotatable with said rotatable part.

In testimony whereof, we have hereunto signed our names in the presence of two subscribing witnesses.

AUGUSTUS M. SOSA. ALBERT E. ROBINSON. HERMAN W. SCHATZ.

Witnesses:

E. R. GROSSMAN, GUI H. ROBINSON.