US1489523A - Drilling machine (multiple drill) - Google Patents

Description

April 8, 1924;

1,489,523 w. R. FOX ET AL DRILLING MACHINE (MULTIPLE DRILL) Filed Aug. 8, 1921 8 Sheets-Sheet 1 Vvilliam 12.17am, 2, J16; mi D. Cantu in, 13 ZJZMQ, a v l;;w

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Patented Apr. 8, 1924.

UNITED STATES PATENT OFFICE.

WILLIAM R. FOX AND HOWARD 1)., coRwI or JACK$OK,.MICHIGAN, ASSIGNORS T0 FOX MACHINE comm, or JACKSON, MICHIGAN, A CORPORATION.

DRILLING MACHINE (MULTIPLE DRILL).

Application and August a, 1921. Serial a... 490,662.

To all whom it may concern:

Be it known that we, WILLIAM R. Fox and HOWARD D. CoRwrN, citizens of the United States, and residents of Jackson, in the county of Jackson and Stateof Michigan, have invented certain new .and useful Improvements in Drilling Machines (Multiple Drills), of which the following is a specification.

The invention relates to multiple drilling machines and consists in the features and combination and arrangement of parts hereinafter described and particularly pointed out in the claims.

.Our invention is illustrated in the accompanying drawings, inwhich V Figure 1 is a side view of a drilling machine embodying our invention;

Fig. 2 is a front View;

Fig. 3 is aside view of the upper end of the column and gear case;

Fig. 1 is a vertical transverse sectional view of the upper gear box containing the change speed gearing;

Fig. 5 is a longitudinal section of the upper gear box and gearing;

Fig. 6 is a planview in the nature of a diagram or a development of the change feed gear of Figs. 4: and ,5; A

Fig. 7 is a vertical cross sectional view'of a floating coupling;

Fig. 8 is a sectional plan view partly along the shaft of the shrouded pinion and partly along the clutch shaft;

Fig. 9 is a side view of parts of Fig. 8; Fig. 10 is an end view of parts of Fig. 8; Fig. 11 is a view of the saddle and'a part of the column, and the clutch and gearing for operating the saddle;

Figs. 12, 13, 14 and 15 are views of the saddle; v V a Fig. 16 is a central vertical sectional view of the gear chest of the drill carrying'head, for asingle speed spindle machine; Fig. 17 is asimilar'view of a gear chest of a double speed spindle machine;

Fig. 18. is a plan view of a detail. t Fig. 19 shows the head and saddle in section.

Fig. 20 is a detail. V I V The main supporting columnv is, shown at 3, av n w B x d byaae s a dowels thereto, which. rack isengaged by a pinion Cf, the teeth, of which are cut in a shaft 0 in such manner that the pinion is shrouded. That is ,to say, thetoothed part of the pinion is of no greater diameter than the portions of the shaft at each side of the teeth of the. pinion. This shaft bears in saddle C which is vertically adjustable on r the column B by turning the shaft and causingithe pinion to roll along the rack. The saddle, is held to the column B so as to slide vertically thereon, by gibs (3*, which are screwed to the saddle and bear on the rear faces of the flanges 6 of the slideway of the column. The. saddle is recessed on its rear face toreceive the slideway portion of the column which actsas a guide therefor. The p nion shaft c with. its integral shrouded plnion, is assembled with the saddle by simply thrustingit into place longitudinally, andv the saddle is then placed into position against the front of the slideway portion of the column. This saddle forms the carrier or support for the head C, which the drill spindles 0 are located, the said head also having a chest C in'which the gears for.

transmitting motion-to the drill spindles are located. Thehead'G and the saddleC are formed separately from eachother, and are bolted together. Thistwoepart construction is of; advantage, because it is much cheaper to plane off the saddle, because a number of them can be placed on the planer at the same time; the two parts can be handled more readily than if they were in one piece, and

in finishing and' fitting the parts together and fitting the saddle to the column, the work is facilitated by this two-part construction. Furthermore, by making the saddle separate from the head C, C, it can be made longer and extended below the lower portion of the head,thus giving more bearing on the column, and, consequently, more firmness to the head. This lengthened construction of the saddle in respect to the head would not :be feasible if the two'parts were made in onecasting, because'the head could not then be as readily machined on its lower face and this machining. is necessary in ord er to receive the spindle brackets with accuracy. j V

A better casting candbe madeby having thesa ddle. separate f rom the head. Further, it is pos sible'to' 'm'ountfeed works or a motor of drilling heads must be employed and also different layouts of the drilling spindles must be used in each of the different sized heads. It is, therefore, of importance to build the multiple drilling machine as fully as possible like a stock machine, and in carrying out this purpose in connection with the present invention, themaohine is built as a stock organization up to and including the saddle, so that this saddle with the column and the parts carried thereby may be a stock organization, ready tohave assembled therewith heads of different sizes, or heads having different drill layouts.

The shaft 0 of the shrouded pinion is driven through connections from a vertical shaft D, having on its lower end a worm 41 meshing with a worm wheel 40. The worm wheel 40 is fixed on a shaft 42 mounted in a clutch box 43 carried by the head C or saddle. This shaft has mounted there on a clutch C which is slid along the shaft by fingers 44 pivoted to a collar 44. To overcome the end thrust this collar is adjustably secured to the shaft by a screw thread. The fingers are operated by a cam collar 45 loose on the shaft. This collar is operated by a fork 46 on the shaft 26 which is operated by a hand lever 23. The clutch C when set, turns the pinion 47 which through reduction gearing 48, 49, 5O operates the shaft 0 of the rack pinion C".

The worm 41 is splined to the shaft D and as the saddle together with the head moves up and down, due to the shrouded pinion traversing the rack B, the said worm 41 will move up and down along the shaft D, and the entire clutch or worm gear boX 43 partakes of this up and down movement with the saddle and head.

At the top of the column B is located variable speed feed gearing for the shaft D, this gearing being located in casing D, suitably secured to the column. This variable speed feeding gearing is driven from a pulley E which drives the shaft G. The shaft G carries a group of three. gears 01, shifted along the shaft by a lever 61 I This lever is mounted on a vertical shaft 61 which extends down to a control lever 61". The gears 03 are adapted to separately engage the gears d, 612, d on a sleeve d held on shaft R mounted in suitable bearings in the housing D of this speed gear mechanism. The

shaft can be removed without removing the sleeve. By shifting the set (i of three gears, three different speed changes can be secured through the gears d, d and d respectively. The gear (Z transmits the motion in either case to a shaft 54, carrying a gear 55, mesh ing with the gear (Z and this shaft has a two-speed gear 56, having a grooved portion adapted to connect with a lever 62 mounted in a bearing 62 and operated by a handle 62.

The two-speed change feed gear 56 is adapted to engage respectively with gears 57, 57 on a shaft 57 which carries fixed thereto the gears just mentioned, and also gears 57* and 57 These gears are adapted to mesh with gears of a shifting group 58, splined to a shaft 59, shiftable to get the desired gear engagement by a lever 63 op erated by a handle 63.

In Fig. 6 this gearing is shown developed or spread out for convenience of illustration and understanding.

The shaft 59 carries a worm 6O meshing with a worm wheel 51 on a shaft section D This shaft section has its bearings in'the' shaft D, which remains mounted in its housing. The feed shaft D, by reason of its splined or key way connection with the worm 41, can be dropped down through this worm and removed from the machine after having first detached it from the stub shaft D by unfastening the collar D This action can be carried out'without disturbing the feed gear box or any of the feed gearing connections at the top of the machine. .This floating coupling comprises a member D on the short shaft section D and a member D on the upper end of the shaft D. These two members are connected by a central member or plate 65, which has tongue and groove connections 66 and 66 with the parts D and D respectively, these tongues extending at right angles to each other. This floating coupling compensates for any offset relation of the shaft members D and D. The advantage of this connection is that it renders it possible to jig-drill the feed works into the casing or head and assemble the head on the column and connect the vertical shaft D to the feed gear mechanism even though the feed shaft D does not perfectly line up with the said feed gear mechanism. The shaft D, as above described, is connected at its lower end through the worm and worm gear, 1 and thencethrough the clutch C with the shaft of'the shrouded pinion and the clutch serves the purpose of connecting or disconnecting the shrouded pinion shaft from the vertical drive shaft 1), and hence this vertical drive shaft does not require, as is the case with other forms of construction, to beshifted laterally to engage or disengage the worm with the worm gear. But in order to line up the shaft with the feed gear mechanism at the top it would be necessary, were the floating coupling D D not employed, to assemble the feed gear mechanism on the column and bore the connecting holes in the head after the machine is assembled. This requires exceptionally accurate work which is avoided by our construction, inwhich we employ the floating coupling between the vertical shaft D and the shaft section D The gearing in the gear chest C is driven from a vertical shaft 0, which in turn is.

driven through bevelled gearing from the shaft R, above described;

, We have. also provided means wherebythe same head or gear chest 0' which is employed for a double speed spindle organization, can be used in a single speed spindle form of machine. This improvement comprises a filling-in plate 70, Fig. 16, which is supported on the base plate 72 of the gear chest or head C when this chest is used in a single speed spindle machine. The plate has ball bearings 73 for the hollow shaft 74: of the gears 4, and it also has openings to receive the bushings 77 which aiford bearings for the spindles 3 of the pinions 5, it being understood that the spindles 3 are connected with the drill spindles C by flexible couplings. The single speed spindle arrangement is designed for doing heavier work than a two-speed spindle arrangement, and hence the same li htcasting or head and gear chest can be a apt'ed for the heavier work of the single speed spindle arrangement by applyingthe reenforcing or fillingin plate with its additional bearing facilities afforded by the longer bushings .77, which are backed not only by the frame of the chest, in this particular instance by base plate 72, but alsoby the filling-in-plate. v

With the single speed spindle organization the pinion 5 is formed integral with the spindle for doing heavy work.

.In addition to this filling-in plate there is provided in this single speed spindle organization a cover plate which is supported on the upstanding flange- 70; of the filling-in plate. This cover plate affords an upper bearing for the top of the spindle, and this bearing isprovided withla 75*.

. An. dvant ge-gaine y this cons r cti is thatin caseit is desired tohave i-nj'one drilling circle spindles running at difierent sp eds; th an 'bexa qqlep i hed by ext nding, say everyother spindle above the "top or cover plate 75', as shownin Fig. 16, the

pinion 5 being omitted, and aflixing thereto gear chest orhead which may be used interchangeably in either a single or a double speed spindlejmachine,'said head when used in a single speed spindle machine having the filling-in plate attached thereto and when used in a two-speed spindle machine being without this plate.

In'the double speed spindle machine a lift} ingfork 93 is employed to shift a double pinion 5 vertically, as shown in Fig. 17, to change the speed, and the omission of the filling-in plate in the two-speed spindle head affords the room for the working of this lifting fork, or,'to put the matter in another way, as the lifting fork isnot employed in the single speed spindle machine, there is space for the use,of the filling-in plate 70 to give the additional bearing facilities and strength desirable in a single speed spindle machine for doing heavier-work or installing a larger number of spindlesthan with a double-speed spindle machine,

In order to adjust the pinions of -the two pinion gear chest, we provide a fulcrum post 103 mounted on the casing O; which carries the detent 105, which engages the groovesin the vertically adjustable rod 106,0onnected with the lifting fork 98 of the double pinion. The'post 103 is provided with a plurality of grooves to receive the fork 107 of the lifting flever. By this fulcrum post the shifting fork can be moved either up, or down bya 0 leverageaction. have also improvedthe bearing for the main driving shaft 0 of thefge'ar chest. This bearing includes a thrust ball bearing 80, which takes the pull of the shaft in drilli5 saidring having a lip 83 for holding the members of the lower ball bearing 81 in place. This lip holds the race ring, and the ball bearing comprise an upperjand 'a bearing is comp y a p m m er 84 when js'iheld i p ace y t nd y mev d- Th clutch and warm gean'boxare counterbaljo' i'ng h e the n ire earing may be lower ra c e ring, the latter resting on the 7 race r ngsj of the lower ball-bearing. The

.';.1 1 mw h ends-ed th so ancedby weights 85 arranged within the column and connected with the head by chains or other flexible connections 86 extending over pulleys 87 Reverting to the variable feeding gear works at the top of the column in its relation to and cooperation with the two vertical shafts D and O, the former giving variable vertical movement to the saddle with the drilling head, and the latter giving varying speeds to the drills through the gearing in the gear chest, it will be observed that vertical shaft 0 is variably driven by shifting the group of gears d of the main drive shaft G, to engage either one of the gears d, d or d of the shaft R. It will be observed further, that the gear d forming a part of this variable speed drive for the vertical shaft 0 of the spindle organization, forms a part of the gear train leading to the vertical feed shaft D. That is to say, this gear d communicates its power and its varying speed through the gearing on shafts 54, 57 and 59, and the speed of the shaft 59 is varied by the shifting of the groups of gears on said shaft 59 and on the shaft 54:.

We have provided means for taking care of oil discharged from the bearings of the spindles 3 of the pinions of the gear chest. This means consists of disks 90 as shown in Fig. 19, arranged below the gear chest and at the lower ends of the bushings 77. These disks have their edges located at some distance from the center of rotation and they overlie a pan or tray 91 which is adapted to catch the oil thrown oif from these disks. This oil is conveyed back to a suit-able source by the pipe 92. This disk can be flanged up where it engages the shaft and flanged down at its periphery.

Reverting to the vertical shaft D which carries the worm for driving the shrouded pinion through certain intermediate connec tions, it will be observed that this shaft has no lateral movement to control the operation of this power transmitting connection, and hence this whole mechanism can be housed and the housing supplied with lubricant to lubricate all of the parts therein.

l/Ve haveprovided special means for holding the arms 95 Fig. 19, which act as holders for the lower sections 0 of the flexible shafts which carry the drilling tools. This means consists of a bolt 97, a cup washer 98, a light washer 99, a spring 100, and a nut 101. When the nut 101 is released, if no provision were made to prevent it, the arm would tip-forward and make it difficult to locate the drill in the proper position.

' To avoid this, the spring 100 is employed in the cup washer so that when the nut 101 is slacked off to make an opening at 102, which is done in order to adjust the arm, the spring will still hold the arm up against the underside of the head, but will admit of the to make its teeth 110 engage with the rack.

B and hold the head against falling down. Reverting to the gearing at the top of the column, the drive shaft G and the speed shaft R are mounted in the main gear casing D. This has an open side to which is removably attached the supplemental gear casing D- in which are mounted the shafts, 54C, 57, 59 and the variable feed gearing for driving the feed shaft D. This supplemental casingor gear box has attached theretothe auxiliary housing D in which the stub shaft D bears. It also carries a bearing 61 in which the stub shaft 61 is mounted. This stub shaft carries the arm 61 for shifting the speed changing gears on the drive shaft G of the main gear box D. This stub shaft is connected to the shaft 61 by a detachable coupling 61.

'By reason of the fact that the supple mental gear casing D -can be adjusted up or down or towards the front or back of the machine, the assembly of the parts at. the head of the machine is facilitated, making for economy of time and accuracy of adjustment. It can be quickly located centrally of the opening in-the main gear box, and being formed separately from the main gear casing D, it can be moved readily, and can be jig drilled independently. It with its feed gearing can be removed without disturbing the main casing with its speed gear:-

1ng. r

From the above description it will be seen that the feed gearing is driven from one of the gears on the speed shaft R. The feed gearing in the supplemental gear box rotates at high speed, which speed is variable, and the main'reduction of the speed is made in the train of connection at a point between this variable speed feed gearing and the shrouded pinion shaft.

The adjusting handles 62", 63 for the feed gearing, and the adjusting means for the speed gearing (of the main casing), viz, the arm 61 and stub shaft- 61, are all mounted on and removable as one body with the supplemental gear-casing.

A stopping lever is shown at L. This controls a suitable clutch at pulley E, through lever K, shaft J, arm Land rod H.

Having thus described our invention, what we claim is: i I

1. In combination in-a drilling machine, a single column, a saddle slidable vertically of and wholly supported by said single column on the face thereof, a drill carrying head projecting from the said saddle and tsetse the lower face of the drill head, means for' making the saddle traverse the column, said means consisting of feed works carried by the-saddle and including a pinion and a rack on the column with which said pinion en'- gages, substantially as described.

3. In combination in a drilling machine,

a single column, a saddle slidably mounted on the front face of the column and having a channel in its rear face, a central opening and bearings on opposite sides of the cen-- tral opening, a vertical rack on the front face of. the column and in the channel in the rear face of the saddle, a shaft mounted in the bearings of the saddle and having teeth therein to form a pinion registering with the central opening and engaging the rack, substantially as described.

e. In combination in a drilling machine, a column, a head carryingthe drills, a shaft extending to the head for driving the drills, a saddle slidable vertically on the column and to which the head is connected, arack on the column, a pinion carried by' the saddle, a vertical shaft extending along the column, power transmitting means between the lower end of said shaft and the pinion shaft, said vertical shaft being supported in bearings both its upper and lower ends. maintaining itfagainst lateral movement,- gearing at the top of the column for driving said vertical shaft, a floating coupling at the upper end'of the vertical shaft to transmit power thereto from the said" gearing, a horizontal drive shaft for said gear ing, a horizontal shaft geared to the shaft which drives the drills, and gearing for driving the latter horizontal shaft from the drive shaft, substantially asdescribed.

5. In combination in a drilling machine, a column, a head carrying the drills, a

shaft extending to the head for drivingthe' drills, a saddle, slidable vertically on :the column and to which the head is connected,

a rack on the column, a pinion carried by thesaddle together with its horizontal shaft,

a vertical feed shaft, power transmitting means between the lower end of saidfshaft and the pinion shaft, said vertical feed shaft being supported in bearings at both its up er and lower ends, maintaining it against ateral movement, gearing at the top of the column for driving said vertical feedjshaft, afioating coupling at the upper end ofthe vertical feed shaft to transmit power thereto from the said gearing, and a vertical shaft section, driven by said gearing, said shaft section and vertical feed shaft first mentioned'being parallel and having the'parts of the floating coupling connected thereto.

6. In combination in'a drilling machine, a column, having. a vertical rack, a drill head, a pinion engaging the rack for moving thedrill head along the column, feed gear works at thetopbffthe column for driving the-pinion, anda vertical feed shaft held at its. upper. and lower ends against lateral play,1a vertical shaft section above the vertical feed shaft, driven by" the feed gear works, and a floating coupling between the said vertical shaft section and vertical feed shaft section, substantially as described.

7. In combination, in a drilling machine, i

a column, a drill head saddle slidable verti cally thereon, a drill head and gear chest carried thereby, a rack on the column, a

pinion, a shaft carrying the pinion and mounted on the v saddle, a vertical shaft, geared to the pinion shaft for driving it, gearing in the chest of the head for driving the drill spindles, a verticalshaft for driving said gearing in saidchest, a variable'speed' gearf works for driving the two .vertical, shafts, comprisin a main drive shaft arranged horizontal y, a I shaft parallel there,- withfgeared to the vertical shaft of the gear chest, shifting variable. speed gears on the drive. shaft,- complementar gears on the said parallel shaft, a plurality of other shafts parallel with the shaft first mentioned, the. first of said shafts being geared toone of the gears of the parallel: shaft first mentioned and the final one of said other parallel shafts. bein" geared to the vertical feed shaft ofthe sa dle, and variable speed gearing between said other parallel shafts,

substantiallyas described: i

8. In "ombination acolumn', a drill head slidablybonnected therewith, drills carried" thereby, a gear box,:a pair of shafts extend:

ing down from the. ear bo'x on'e of said shafts being for driving the drills and the other for imparting sliding movement. to the drill head, gearin between the lower ends of said shafts an the drills and head respectively, gearing in the gear box" for drivingsaid shafts, said gearing including a plurality of wears, a sleeve carryingthe same, and a sha t passing through the sleeve bearing in the gear box and connected with the sleeve, .said' sha-ft being removablefrom the. sleeve andgear box, and means for retaining the sleeve. in normal position in the gear box when said shaft is removed, substantially as described;

9. Ina'drill a gear chest, vertical shafts therein, gears on said shafts, spindles carrying pinions meshing with the gears for driving the drills, and a removable insert plate at the lower part of the gear chest having bearings for the pinion spindles, said plate by its removal providing space adapting the gear chest to a two speed gear set, substantially as described.

10. In a drill a gear chest, vertical shafts therein, gears on said'shafts, spindles carrying pinions meshing with the gears for driving the drills, a removable insert plate at the lower part of the gear chest having bearings for the spindles, and a second insert plate above the pinions in the gear chest also having bearings for the said spindles.

11. In a drill a gear chest, vertical shafts therein, gears on said shafts, an upper insert plate in the chest affording bearings for the shafts, spindles carrying pinions meshing with the gears for driving the drills, and a removable insert plate at the lower part of the gear chest, having bearings for the pinion spindles, said plate by its removal providing space adapting the gear chest to a two speed gear set, said upper insert plate being supported on the lower by a flange on one bearing on the other.

12. In combination in a drilling machine, a gear chest having gears for driving the drill spindles, shiftable pinions for varying the speed of the spindles, grooved rods for adjusting the pinions extending above the chest, and means on the top of the gear chest to serve as a fulcrum for a lever for operating the rod, substantially as described.

- 13. In combination in a drilling machine,

a gear chest having gears for driving the drill spindles, shiftable pinions for varying the speed of the spindles, grooved rods for adjusting the pinions, and posts on the gear chest to serve as a fulcrum for a lever for operating the rod, said post having a plurality of fulcrum bearings for the operating lever, substantially as described.

14. In a drilling machine, a gear chest, gears therein, spindles drivin from said gears, a shaft extending into t e top of the gear chest substantially centrally thereof, a master gear on said shaft for driving the gears in said chest and a bearing for said shaft comprising a ring, secured to the gear chest, two ball bearings carried by the ring, one above the other, one for sustaining the lateral thrust and the other the longitudinal thrust, and a cap member for said ring, the ball bearing race rings being held between said cap and a lip on the lower part of the said ring, substantially as described.

15. In combination, a column, a head movable along the column, spindles carried by the head, means for driving the spindles, means for moving the head along the column, including a pinion and a rack, the latter being on the column, a counter weight a series of drill spindles, a gear chest having gearing for operating the said spindles, an insert plate at the lower part of the gear chest, pinions on certain of the spindles above the said insert plate, a second insert plate located in a plane above the pinions, and pinions above'said second insert plate for driving certain of the spindles, substantially as described.

17. In combination in a drilling machine,

a column, a tool carrying member mounted to sllde on the column, and having an opening at a point intermediate of its width with a shaft bearing at each side thereof, a rack on the column, and a removable shaft mounted in the said bearing of said tool carrying member, said removable shaft having teeth therein providing a pinion of no greater diameter than the adjacent part of the shaft and thus adapted to slip through one of the bearings, said pinion engaging the rack through the said opening, substantially as described.

18. In combination in a drilling machine, a column, a gear box at the upper end thereof, a tool carrier slidably mounted on the column, a rack on the column, a pinion mounted in the tool carrier, a vertical shaft,

power transmitting means between the lower end of said shaft and the pinion shaft, bearings for said shaft maintaining it against lateral movement, a stub shaft in the gear box parallel with the vertical shaft, gearing in the gear box at the top of the column for driving said stub shaft, and a floating coupling at the upper end of the vertical shaft to transmit power thereto from said parallel stub shaft, substantially as described.

19. In combination in a drilling machine,

vertical shaft with driving connections to the tool carrier to feed it along the column, change speed gearing at the top of the column, a casing therefor, a removable supplemental casing, gearing therein for communicating motion from the speed gearing to said vertical shaft, a vertical stub vshaft mounted in the supplemental casing, and having means for setting the speed gearing, a shaft extending alongside the column, a detachable connection between said shaft and the stub shaft, and a handle for operating the vertical shaft, substantially as described.

21. In combination in a drilling machine, a column, a drill head slidable vertically thereof, a rack on the column, apinion on the drill head, a vertical feed shaft extending alongside the column, gearing for driving the pinion from said vertical shaft, a vertical tool driving shaft geared to the drills, a horizontal speed shaft geared to the vertical tool driving shaft, a main gear box supported on the column and in which said horizontal shaft bears, a drive/shaft also mounted in the main gear box and having a variable gear connection between it and the speed shaft, a supplemental casing detachably secured to the main casing, a vertical stub shaft mounted in the supplemental casing, a floating coupling between said stub shaft and the vertical feed shaft, variable speed gearing between the speed shaft and the vertical stub shaft including shiftable gears, and handles mounted on the supplementalcasing and connected with the shifting gears, substantially as described.

22. In combination, a column, a tool carrier slidable thereon, a'vertical feed shaft for the carrier, having connections for driving said carrier, a main gear casing at the top of the column, a driving shaft and a speed shaft mounted horizontally therein, a supplemental casing detachably secured to the side of the main gear casing, variable feed gearing in said supplemental casing, hand operable means on the supplemental casing for setting the feed gearing, variable speed gearing between the drive shaft and the speed shaft, and means mounted in the supplemental casing for setting the speed gearing, said feed gearing being driven from one of the gears on the speed shaft, substan tially as described. V

23. In combination in a machine of the class described, a column, a tool carrying head movable along the same, a vertical feed shaft, driving connections between the same and the head for moving the latter on the column, a feed gear box at the top of the column, a stub shaft driven from the gearing within the column, and a detachable coupling between the stub shaft and the feed shaft, substantially as described.

24. In combination in a machine of the character described, a column, a tool carrying head movable along the same, a vertical feed shaft with driving connections between the same and the head for moving the latter along the column, a feed gear box at the top of the column, a vertical shaft section driven by the feed gearing, a stub shaft, a floating coupling between the vertical shaft section and'the stub shaft, to compensate for disalignment of saidshafts, and a detachable coupling between the feed shaft and the stub shaft, substantially as described.

25. In combination, a column, a tool carrying head slidably mounted thereon, a Vertical feed shaft, driving connections between the feed shaft and the head, including a gear having a key and key way connection with the vertical feed shaft, said key way extending along the feed shaft to its up per end, driving means for the feed shaft at the upper end thereof, and a detachable connection between the driving means and the vertical feed shaft, whereby the latter may be dropped down through the gear and removed from the machine without disturbing either the driving means for the vertical feed shaft or the driving connections leading therefrom, substantially as described.

26. In combination in a drilling machine, a single column, a drill carrying head slidable vertically of said column, and projecting from the face of said column, a rack on the column and a horizontal pinion shaft supported in bearings connected with the head, a gear box at the top of the column, a vertical shaft extending alongside the column and driven from gearing in the gear box, driving connections between the lower end of the said vertical shaftand the horizontal pinion shaft, a shaft driven by the gears in the gear box and extending forwardly fromsaid box over the projecting drill carrying head, and a vertical shaft driven from the horizontal shaft and extending down to the drill head to drive the drills.

In testimony whereof we aflix our signatures.

WILLIAM R. FOX. HOWARD D. CORWIN. Witnesses:

FLORENCE A. GERMAN, GERTRUDE E. KROME.

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