US1682844A - Box-column-type upright drill - Google Patents

Description

D. c. KLAUSMEYER BOX COLUMN TYPE UPRIGHT DRILL Sept. 4, 1928. 1,682,844

Filed June 4, 1925 2 Sheets-Sheet 1 D. c. KLAUSMEYER BOX COLUMN TYPE UPRIGHT DRILL Sept. 4, 1928.

Filed June 4, 1925 Z-Sheecs-Sheet 2 Patented Sect 4,

UNITED STATES 1,682,844 PATENT UFFlCE.

DAVID C. KLAUSMEYER, 01E C'Il lCINIwTATL '03- T. ASQJZGN'OTR TO THE CINCINNATI BICK- FORD TOOL GOIHPANY, 0F GINUL'El'JlTA'lI, OHIO, A CORPORATION 01 OHIO.

Application filed June 4, 1925.

My invention is concer ed with drilling machines and is particularly,conce *ned with upright drillingmachines having hoe: columns.

In a drilling machine of the upright type it is oesira-bie to operate the machine by means of a motor mounted on the top of the column or frame. Moreover in a. drilling machine of the above indicated type, having a box column, it is desirable to have the motor mounted as near as possible to the centre line of the box column. The position of the motor on the clumn is controlled to a large extent by the gearing connection lOBlZiVGOll the motor and the drill spindle.

One of the important features of my invention is to construct a drilling machine so as to permit the mounting oi the propelling motor on the top of the column near the centre line thereof. Moreover it is an important feature of my invention to simplify the gearing connection between the motor and the drill spindle.

In a drilling machine constructed in accordance with myinvention, a work carryinn table and a drill head are adjuetably and slidably mounted on the side of a box column. lit the top of the hon: column. is mounted the propelling; motor and a casing for carrying the gearing connection between the motor and the drill spindle. The gearing; carried in the ca comprises a backg 'ear sleeve and a reversing sleeveboth of which sleeves are aliened with the drill spindle. ll. baclcg ear shaft provided for connecting the reversing: sleeve to the bacl -t car slcevcf 'iho reversing sleeve is directly connected to the motor through a flexible joint and isprovided with means for reversing; the direction of its rotation at will. fit the upper end ot the reversing: sleeve and the bacle gear shaft is provided a transposition gear mechanism which in y be operated to obtain dil'fcrcntspeeds. Suitable change gears are prm idcd for connecting the lower end of the V shaft to the baclogrear sleeve whereby additional speeds are obtained. The lJfLi'lPQt-atl sleeve splined to the drill spindle and the reversingsleeve permits free rotation and linear movement of the spindle within it. By reason of having the baclegear sleeve and the reversing sleeve, which are in the nature of shafts, aligned with the drill spindle it is possible to mount the propelling motor closer to the main spindle, Accordingly, it is pos- Serial lilo. 84,829.

sible to mount the motor very close to the centre line of the column and not to support the motor on a bracket projecting from the side of the column. The above construction also sunphhcs the connection between the mo tor and the main spindle.

The back gear shaft, which connects the reversing sleeve to the back-gear sleeve, operates a pump for supplying lubricating material to the mechanism connecting the propelling motor to the drill spindle. The pump is preferably connected to the lower end of the bacltgear shaft and has an inlet opening connected to a well formed in the bottom of the casino; surrounding the sleeve and the back-gear shaft.

@ther objects and advantages *il] be in part indicated in the following; description and in part rendered apparent therefrom in connection with the annexed drawings.

To enable others skilled in the art so fully to apprehend the underlying features hereof that they may embody the same in the various ways contemplated by this invention, drawings depicting a preferred typical construction have been annexed as a part of this disclosure and in such drawings, like characters of reference denote corresponding parts throughout all the views. of which Figure 1 is an elevational View of a drilling;- machine constructed in accordance with my invention. Fig. 2 is a sectional view through the gearing connection between the motor and the drill spindlel ii is a section through a portion of the lubricating 1111111. A main propelling motor 6 mounted on a bracket 7', which is supported on the top of the column 1, and a rear casino; 8 is mounted on a bracket 9 which is supported on the top of the column. In referring to 1 of the drawings, it will be noted the motor 6 is mounted near the centre line or" the column 1 and does not project over the side of the column to any great extent as in the case of many drilling machinesnow constructed. 4

Referring to 2 of the drawing, a reversing sleeve 10 and a back-gear sleeve 11 d on the column 1 and the tool head 5 is are shown aligned with the drill spindle 12. The drill spindle 12 is carried by the drill head 5 and projects through the two sleeves and 11. The drill spindle 12 is slidable and rotatable with respect to the sleeve 10 whereas the baclegear sleeve 11 is splined to the spindle. In Fig. 2 of the drawings the baclegear sleeve 11 is shown connected to the spindle 12 by means of a spline 13. A bracket 14, which is secured to the casing 8 by means of bolts 15, carries a bearing 16 servlng as a journal for one end of the reversing sleeve 10. A second bracket 17, which is secured to the casing 8, carries a bearing 18 serving as a journal for the lower end of the reversing sleeve. The bracket 17 also carries a bearing 19 for jonrnaling the upper end of the backgear sleeve 11. A third bracket 20, which is secured to the casing 8, carries a bearing 21 for journaling the lower end of the back-gear sleeve 11. V a

The reversing sleeve 10 carries a reversing mechanism which comprises two bevelled gear wheels 22 and 23 rotatably mounted on the sleeve. Between the two bevelled gear wheels 22 and 23 is interposed a bevel gear wheel 24: which is secured to a short shaft25. The gear wheel 24 meshes with the two gear wheels 22 and 23 and serves to rotate the gear wheels 22 and 23 in opposite directions. The gear wheel 22 is mounted on a collar 26 and the gear wheel 23 is mounted on a collar 27. The collars 26 and 27 are rotatably mounted on the reversing sleeve 10 and are adapted to be connected to the sleeve by means of friction clutches 28 and 29. The two friction clutches 28 and 29 are controlled by a cam rod 30 which slides in a slot formed in the reversing sleeve. Near the ends of the cam rod 30 are formed cam surfaces 31 and 32. The cam surfaces 81 and 32 respectively operate pins 33 and 34 for controlling the friction clutches 28 .and 29. The friction clutch mechanism is described and claimed in my co-pending application Serial #805, filed January 6, 1925. Accordingly a detailed description of such mechanism in this application is deemed unnecessary. The cam rod 30 is secured to a collar member 37 by means of set screws 38. The collar member 37 is slidably mounted on the sleeve member 10 and is positioned between the two bevel gear wheels 22 and 23.

The collar member 37 is operated by means of a lever 40 which is pivotally mounted on the casing S. A segment 41 having detents or notches 42 formed therein is provided on the lever 40. A plunger 43, which is operated on by a spring 44, is provided for engaging the detents or notches 42 formed in the segmental plate 41. The plunger 43 serves to hold the collar 37 in position to rotate the sleeve 10 either in a forward or in a reversed direction. The lever 40 is provided with suitable means for engaginga groove formed in the collar 37 and accordingly upon operation of the lever 10 the cam rod 30 is shifted to operate either the clutch mechanism 28 or the clutch mechanism 29. Upon operation of the clutch mechanism 28 the gear wheel 22 is connected to the sleeve 10 and upon o 381- ation of clutch mechanism 29 the gear wheel 23 is connected to the sleeve 10. By such means the direction of rotation of the reversing sleeve is controlled.

The short shaft 25, which carries the bevel gear wheel 21 and which is connected to the motor 6 is ournalcd in two bearings 46. The bearings 46 are suitably carried by the collar +17 which is supported in the casing 8. The short shaft 46 is connected to the motor shaft 48 by means of a flexible connection 49. The flexible connection 49 comprises a collar 50 which is secured to the short shaft 25 and a collar 51 which is secured to the motor shaft 48. A plurality of'pins 52 are mounted on the collar 50 and similar pins 53 are mounted on the collar 51. The pins 52 and 53 project through a collar 54 which is loosely mounted on the motor shaft 48, as shown in Fi 2 of the drawings. By such means a flexib e connection is provided between the driving motor and the short shaft 25.

A back-gear shaft 55 is mounted in the gear case 8 parallel to the drill spindle 12 and adjacent to the sleeve members 10 and 11. The upper end of the back-gear shaft 55 is journaled in a bearing 56 which is supported in the bracket 14. The lower end of the backgear shaft is journaled in a bearin 57 which is supported in the bracket 20. The upper end of the back-gear shaft is connected to the upper end of the reversing sleeve 10 by means of two transposition gears 58 and 59. The transposition gear wheel 58 is splined to a sleeve 60 which is secured to the back-gear shaft 55. The transposition gear 58 comprises two circular rows of gear teeth 61 and 62 which have teeth of the same pitch but different in number. The transposition gear 59, which is splined to the reversing sleeve 10, is provided with two circular rows of gear teeth 63 and 64. The circular rows of gear teeth 63 and 64 have the same pitch as the teeth on the transposition gear 58. The circular row of gear teeth 64 on the transposition gear 59 is adapted to mesh with the circular row of gear teeth 62 on the transposition gear 58 for operating the back-gear shaft 55 at one speed. When it is desired to operate the back-gear shaft 55 at a different rate of speed the position of the transposition gear 58 is reversed on the sleeve 60 and the position of the transposition gear 59 is reversed on the reversing sleeve 10. In the reversed position of the two transposition gear wheels the row of teeth 63 on the transposition gear 59 meshes with the row of geared teeth 61 on the transposition gear 58. Further changes in speed may be obtained by interchanging the posit-ion of the gears 58 and 59. The transposition gear wheels shown in this application are disclosed and claimed in the companion application of George E. Merryweather, Serial No. 37,468 filed J rule 16, 1925.

Near the lower end of the back-gear shaft 55 are mounted two gear wheels (36 and 67. The gear wheels 66 and (57 form a part of a change gear system for connecting the backgear shaft to the back-gear sleeve 11. The gear wheel 67 meshes with a set of external gear teeth 68 which are formed on a gear member 69. The {.Z'Gtll member 69 is rotatably mounted on a bushing 70 which is mounted on the baclcgcar sleeve 11. The gear men'iber 69 is also provided with a set of internal clutch teeth -71. The intermilclutch teet-hTl are adapted to mesh with a setof clutch teeth 72 on a shiftable gear member 73. The gear mei'nber 73 also carries a second set of gear teeth Tel which are adapted to be moved into mesh with the gear teeth on the gear wheel 66. The gear member 73 is splined to the back-gear sleeve 11 and is shiftable along the sleeve member to meshthe gear teeth 74 with the teeth on the gear wheel 66 or to mesh the clutch teeth 72 with the clutch teeth 71 on the gear member 69. A lever 76, which is pivotallv mounted on the casing 8, is provided for moving; the member 73 along the sleeve member 11. The lever 76 is provided with a plate 77 in the form of; a segment which has detents or notches 78 formed therein. The detents or notches 78 are engaged by a spring pressed plunger 79 to exert a force tending to hold the lever 7 6 in one of its operative positions.

A gear wheel 81, as shown in Fig. 2, is mounted on the drill spindle 12. The gear wheel 81 is connected through a set of gearing not shown but contained in a gear casing 82 to the feed shaft The feed shaft 83 in a well known manner controls the feeding movement during power feeding operation. Inasmuch as my invention is not particularly related. to the feeding mechanism and inasmuch as said mechanism is well known a further description thereof is deemed unnecessary.

The back-gear shaft 55 operates a pump for supplying lubricating material to the niecl'ianism contained within the casing 8. The pump 90 comprises a casing 91 which is supported by thebraclwt 20 in any suitable manner. The rotor of the pump is mounted on a shaft 99 which is secured to the backp ear shaft The pump is provided with an inlet 93 and an outlet 94. The outlet 94 is connected by a conductor 95 which leads to so the top of the casing 8 and connects with a discharge pipe 96. The discharge pipe 96 is provided with openings 97 for spraylng lubricating material over the mechanism contained in the casing 8.

A well 98 isformed in the bottom of the casing for collecting the lubricating material supplied to the mechanism in the casing 8. The inlet 93 for the pump is connected with the lubricating material in the well and preferably the pump 90 projects into the lubriatihg material in the well as shown in Fig. 2 ofthe drawings. The well 98 is provided with a projecting portion 99, as shown in Fig. 3, having an inlet 100 for supplying, lubricating material to the well and an outlet 101 for draining the lubricating material when necessary. i

In the above described mechanism it will be noted the providing of a gearing system having a reversing sleeve and a hack-gear sleeve aligned with the drill spindle not only serves to simplify and reduce the amount of gearing but also permits the movingof the motor much closer to the drill spindle. Accordingly it is possible to mount the propelling motor very close to the centre line ofthe box column of the machine. Attention is also called to the simplified means for eficctingdiiferent speed changes of the main drilling spindle.

Without further analysis, the foregoing will so fullyreveal the gist of this invention that others can, by applyingcurrent knowledge, readily adapt it for various utilizations by retaining one or more ofthe features that, from the standpoint of the prior art, fairly constitute essential characteristics of either the generic or specific aspects of this invention and, therefore. such adaptationsshould be, andare intended to be, comprehended within the meaning and range of equivalency of the following claims Having thus revealed this invention, I claim as new and desire to secure the following combinations and elements, or equivalent-s thereof, by Letters States:-- 1. In an upright drill, the combination comprising a drill spindle having a backgear sleeve and a reversing sleeve aligned therewith, said back-gear sleeve being splined to said drill spindle; a baclcgear shaft having an operative connection to the reversing; sleeve at one end thereofand anoperative connection to the back-gear sleeve at the opposite end thereof, said connections to the back-gear shaft being constructed to provide changes in speed; and a motor connected to the reversing sleeve. i

2. In an upright drill. the combination comprising a drill spindle having a backgz'ear sleeve and a reversing sleeve aligned therewith, said back-gear sleeve having a spline connection with said spindle; a baclc gear shaft having an operative connection to said reversing sleeve andto the back-gear sleeve; a reversing mechanism mounted on said reversing sleeve; and a motor connected to said reversing mechanism.

3. In a drilling machine, the combination Patent of the United comprising a drill spindle; a shaft arranged parallel to the spindle; first and second rotatable elements aligned with said spindle; a motor connected reversibly with the first rotatable element;a driving connection between the second rotatable element and said spindle; a multiple-speed driving connection between the motor driven element and said shaft; and means for connecting said shaft to the second rotatable element to rotate said element and thereby the spindle at different speeds and in forward and reverse directions.

4. In an upright drilling machine, the combination comprising a drill spindle; a motor; a set of bearings aligned with said spindle; a set of bearings located in one line paral. lel to said spindle; and means including speed change gearing supported in said bearings and rotated by said motor for rotating the spindle at different speeds in both forward and reverse directions.

5. In a drilling machine, the combination comprising a drill spindle; a motor; a set of bearings aligned with said spindle; a set of bearings located in a line parallel to said spindle; and means, including two speed change devices of which one is adapted to multiply thespeeds provided by the other, operating in said bearings and rotated by said motor for rotating the spindle at different speeds. i

6. In a drilling machine, the combination comprisinga drill spindle; a motor; a set of bearings aligned with said spindle; a set of bearings located in a line parallel to said spindle; and means comprising shafts operating in said bearings and rotated by said motor and two speed change devices of which one is adapted to multiply the speeds provided by the other, for rotating said spindle at eight different speeds in a forward and in a reverse direction.

7. In an upright drilling machine, the combination comprising a main frame having a motor mounted on the upper part thereof; a back-gearsleeve; a vertical spindle having a spline connection with said back-gear sleeve; a reversing sleeve aligned with said spindle; a reversing mechanism mounted on said reversing sleeve and connected to said motor; a back-gear shaft; means comprising transposition gears for connecting the reversing sleeve to the back-gear shaft to effect speed changes; and means comprising change gears for connecting the back-gear shaft to the back gear sleeve to effect speed changes.

8. In an upright drilling machine, the comhination comprising a main frame having a motor mounted thereon; a drill spindle; a back-gear sleeve and a reversing sleeve aligned with said drill spindle. said back-gear sleeve being splined to said Spindle; two bevel gear wheels mountedon the reversing sleeve and selectively connected to it for con trolling the dircctionof rotation of the spindle; a motor gear meshing with said bevel gears and connected to said motor by a flexible connection; and means comprising a back-gear shaft for connecting the reversing sleeve to the back-gear sleeve.

9. In a drilling machine, the combination comprising a drill spindle; a back-gear sleeve and a reversing sleeve aligned with said drill spindle, said back gear sleeve being splined to the spindle; power means for rotating the reversing sleeve in a forward and in a reverse direction; a back-gear shaft mounted adjacent to said drill spindle; and means for connecting the reversing sleeve to the back-gear sleeve through said back-gear shaft to rotate the spindle at various speeds in a forward and in a reverse direction.

10. In a drilling machine, the combination comprising a drill spindle; a back-gear sleeve and a reversing sleeve aligned with said drill spindle, said back-gear sleeve being connected to rotate with said spindle; power means for rotating the reversing sleeve in a forward and in a reverse direction; a back-gear shaft located parallel to said spindle; trans osition gears for connecting the reversing s eeve to the back-gear shaft; and change gears for connecting the back-gear shaft to the backgear sleeve.

11. In an upright drilling machine, the combination comprising a box column, a motor mounted on the top of said column; a drill head movable along said column and having a drill carrying spindle mounted thereon; a casing mounted on the top of the column adjacent to said motor; a back-gear sleeve and a reversing sleeve aligned with said spindle and carried by said casing; means comprising bevel gear wheels for connecting the motor to the reversing sleeve to rot-ate the latter in a forward and in a reverse direction; a back-gear shaft; transposition gears for connecting the reversing sleeve to the back gearshaft; and change gears for connecting the back-gear shaft to the backgear sleeve to operate the spindle in a forward and in a reverse direction at different speeds.

12. In an upright drilling machine, the combination comprising a box column; a motor mounted at the top of said column; a drill spindle; a back-gear sleeve and a reversing sleeve aligned with said spindle; reversingmechanism mounted on said reversing sleeve and connected to said motor for controlling the direction of rotation of the spindle; and a back-gear shaft for connecting the reversing sleeve to the back-gear sleeve.

13. In a drilling machine, the combination comprising a drill spindle; a back-gear sleeve direction; a back-gear shaft located parallel to the spindle; transposition gears for connecting the reversing sleeve to the back-gear shaft to operate the back-gear shaft at ditlerentspeeds; and change gears for connecting the back-gear shaft to the baclegear sleeve to operate thespindle in a forward and in a reversedirection at difierent speeds.

14. In a drilling machine, the combination comprising a drill spindle; a reversing sleeve aligned with said spindle; a motor for operating the reversing sleeve in a forward and in a reverse direction; a back-gear shaft; transposition gears for selectively operating the back gear shaft from the reversing sleeve at different speeds; a back gear sleeve having a spline connection with said spindle; and change gears for connecting the back-gear shaft to the back gear sleeve to effect operation of the spindle at different speeds with respect to the back gear shaft.

15. In a drilling machine, the combination comprising a drill spindle; a reversing sleeve aligned with said spindle; two reversing bevel gear wheels rotatably mounted on said reversing sleeve; a motor gear wheel meshing with said reversing gearwheels; a main motor; a flexible connection for joining the motor to said motor gear wheel; a change speed connection between said reversing sleeve and the spindle; and a friction clutch mechanism for selectively connecting the reversing gear wheels to the reversing sleeve.

16. In a drilling machine, the combination comprising a drill spindle; a reversing sleeve aligned with said spindle; two reversing bevel gearwheels rotatably mounted on said reversing sleeve; a motor gear wheel meshing with said reversing gear wheels; a main motor; a flexible connection for joining the motor to said motor gear wheel; a change speed connection between said reversing sleeve and the spindle; a collar rotatably mounted on said reversing sleeve between the reversing gear wheels; a cam rod operated by said collar; and friction clutches operated by said cam rod for selectively connecting said reversing gear wheels to the reversing sleeve.

17. In an upright drill, the combination comprising a box column having a motor mounted on the top thereof; a baclegear sleeve and a reversing sleeve aligned with each other and mounted on said column; a drill spindle having a spline connection to the back-gear sleeve; a back gear shaft for connecting the two sleeves to effect changes in speed between them; two reversing gears rotatably mounted on said reversing sleeve; a sliding collar mounted on the reversing sleeve between the reversing gear wheels; means 1 erated by said collar for selectively "connecting saidreversing gear wheels to the reversing sleeve; a motor gear wheel meshing with said reversing gear wheels; and a motor connected to the motor gear wheel.

sleeve aligned therewith; two reversing gear wheels rotatably mounted on said reversing sleeve; a sliding collar mounted on the sleeve between the two reversing gear wheels; means operated by said collar for selectively connecting the reversing gear wheels to the reversing sleeve; a motor gear wheel meshing with each of said reversing gear Wheels; and a motor connected to said motor gear wheel. 19. In a drilling machine, the combination comprising a drill spindle having a reversing sleeve aligned therewith; two reversing gear wheels rotatably mounted on said reversing sleeve; a sliding collar mounted on said sleeve between the two reversing gear Wheels; means operated by said collar for selectively connecting the reversing gear wheels to the re versing sleeve; a motor gear wheel meshing with each of said reversing gear wheels; a motor connected to said motor gear wheel; and means for connecting the reversing sleeve to the spindle so as to operate the spindle at varying speeds.

20. In a drilling machine, the combination comprising a drill spindle having a reversing sleeve aligned therewith; two reversing gear wheels rotatably mounted on said reversing sleeve; a sliding collar mounted on said sleeve between the two reversing gearwheels means operated by said collar for selectively connecting the reversing gear wheels to the reversing sleeve; a baclegear shaft; transposition gearing for operating the back-gear shaft at diiferent speeds by the reversing sleeve; a back-gear sleeve having a spline connection with said spindle; change gears for connecting the back-gear shaft to the back gear sleeve; a motor gear Wheel meshingwith each of said reversing gear wheels; and a motor connected to said motor gear wheel. a

21. In an upright drill, the combination comprising a drill spindle having a backgear sleeve and a reversing sleeve aligned therewith, said back-gear sleeve being splinemjl to said drill spindle; a baclegear shaft hav-v ing an operative connection to the reversing sleeve at one end thereof and an operative connection to the back-gear sleeve at the opposite end thereof, said connections to the back-gear shaft being constructed to provide changes in speed of the drill spindle; a casing for supporting said sleeves and the bar gcar shaft; a lubricating well formed in the bottom of said casing; and a lubricating pump secured to the baclegear shaft and projecting into said lubricating Well.

22. In an upright drill, the combination comprising a drill spindle having a backgear sleeve and a reversing sleeve aligned therewith, said back-gear sleeve being con nectcd to said drill spindle; a hack-gear shaft having an operative connection to the re versing sleeve at one end thereof and having an operative connection to the back-gear sleeve at the opposite end thereof; a casing surroundin said sleeves and the backear shaft; a lubricating well formed in the bottom of said casing, and a lubricating pump secured to and operated by said back-gear shaft, said pump projecting into the lubricating well in the easing.

23. In an uprightdrill, the combination comprising a drill spindle; a motor for operating said spindle; mechanism comprising a back-gear shaft for connecting the motor to the spindle; a casing for enclosing said mechanism and having a lubricating well formed in the bottom thereof; and a pump secured to said back-gear shaft and projecting into said well for supplying lubricating material to said mechanism.

24. In an upright drill, the combination comprising a drill spindle; a motor for operating said spindle; mechanism comprising a vertical back-gear shaft for connecting the motor to the spindle; a casing for enclosing and for supporting said mechanism; a lubricating well formed in the bottom of said casing; a lubricating pump secured to the bottom of said back-gear shaft and projecting into said well; and a fluid system for carrying lubricating material from said pump to said mechanism.

25. In an upright drill, the combination comprising a drill spindle; a motor for operating said spindle: mechanism comprising a back-gear shaft for connecting the motor to the spindle; a casing for enclosing and for supporting said mechanism; a lubricating well formed in the bottom of said casing; a lubricating pump. secured to and operated by said back-gear shaft, said pump projecting into said lubricating well; and an outlet pipe connected to said pump and extending to top of said casing for delivering lubricating material over said mechanism.

26. In an upright drill, the combination comprising a drill spindle; a motor for operating said spindle; mechanism comprising a back-gear shaft for connecting the motor to the spindle; a casing for enclosing said mechanism; a lubricating well formed in the bottom of said casing; a pump operated by said back-gear shaft; and an inlet port for said pump connected to the lubricating material in said well.

27. An upright drill combining a spindle; a prime'mover means actuated by said primemover for rotating said spindle in forward and reverse directions at a plurality of speeds, said means including a forward and a reverse drive and a plurality of speed change mechanisms, of which one is adapted to multiply the number of speeds provided by the other, operatively connecting the prime-mover with the spindle.

28. An upright drill combining a spindle;

a prime mover; a rotatable member; means selectively to give said member forward and reverse rotations from said prime-mover; and a plurality of speed change mechanisms, of which one is adapted to multiply the number of speeds provided by the other, operativelv connecting said rotatable member with sai spindle, said spindle, rotatable member and speed change mechanisms being arranged on only two axes. a

29. An upright drilling machine combining a column; a casing and a driving motor supported upon said column; a tool spindle rotatably journaled in said casing; a driving gear journaled in said casing co-axial with the driving motor shaft; means actuated by said driving gear for rotating said spindle in forward and reverse directions; and a flexible connection between said motor and said driving gear.

30. An upright drill combining a column; a supporting bracket provided by said col- 1min; a plurality of bearing brackets secured upon said supporting bracket; a plurality of aligned bearings provided by said bearing brackets andarranged on two parallel axes; a reversing sleeve journaled in two of said bearings; a back-gear sleeve journaled in two of said hearings in alignment with said reversing sleeve; a back-gear shaft journaled in two of said bearings parallel with the axes of said sleeves; a spindle splined within said back-gear sleeve; means to rotate said reversing sleeve in forward and reverse directions; and back-gear mechanism acting through said back-gear shaft to transmit to said spindle the forward and reverse rotations of said reversing sleeve at any one of a plurality of speeds.

31. An upright drill combining a spindle; a reversing sleeve rotatably journaled coaxial with said spindle; a second sleeve arranged coaxial with said spindle and having a driving connection therewith; means selectively to rotate said reversing sleeve in forward and reverse directions; and means to transmit to the second sleeve at varying rates the rotations of said reversing sleeve.

82. An uprightdrill combining a spindle; two gears rotatably journaled coaxial with said spindle; means to rotate said gears in reverse directions; a sleeve arranged coaxial with said spindles and having adriving connection therewith, and means including speed change gears for selectively connecting either of said two gears with said sleeve to rotate said sleeve and thereby the spindle at a plurality of rates from either of said reversely driven gears.

33. An upright drill combining a spindle; a prime-mover; a member rotatably journaled coaxial with said spindle; means to give said member oppositely directed rotary motions by said prime-mover; a sleeve surrounding said spindle and having a driving connection therewith; and speed change mechanism operatively connecting said rotatable member with said sleeve to give the sleeve and thereby the spindle oppositely directed rotary motions at a plurality of rates from a single rate in the prime mover.

A drilling machine combining a drill. spindle; a prime mover; forward and reverse driving mechanism mounted coaxially with said spindle; a driving connection between said prime mover and said mechanism; an element rotatably mounted adjacent said spind e; change speed gearing connecting said forward and reverse mechanism to drive said element; and change speed gearing connecting said element to drive said spindle.

In Witness whereof, I have hereunto subscribed. my name.

DAVID C. KLAUSMEYER.

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