US3240278A

US3240278A - Drilling apparatus

Info

Publication number: US3240278A
Application number: US211209A
Authority: US
Inventors: Wallace J Witwer
Original assignee: Koehring Co
Current assignee: Koehring Co
Priority date: 1962-07-20
Filing date: 1962-07-20
Publication date: 1966-03-15
Anticipated expiration: 1983-03-15
Also published as: GB987180A

Description

March 1966 w. J. WITWER DRILLING APPARATUS Filed July 20 1962 4 Sheets-Sheet l 11 in f FI u WW! m ATTORNEYS March 15, 1966 w. J. WITWER DRILLING APPARATUS 4 Sheets-Sheet 2 Filed July 20 1962 ATTORNEYS w. J. WITWER 3,240,278

DRILLING APPARATUS 4 Sheets-Sheet 5 S R V.. w W m m A w Qvfi L? W M Y B wuucom:

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March 15, 1966 Filed July 20, 1962 n hm m bi March 15, 1966 w. J. WITWER 3,240,278

DRILLING APPARATUS Filed July 20 1962 4 Sheets-Sheet 4 ATTORNEYS United States Patent 3,240,278 DRILLING APPARATUS Wallace 1. Witwer, Waverly, Iowa, assignor, by mesne assignments, to Koehring Company, Milwaukee, Wis., a corporation of Wisconsin Filed July 20, 1962, Ser. No. 211,209 5 Claims. (Cl. 173-22) The present invention relates to drilling apparatus, and more particularly to earth drilling or hole boring apparatus.

This invention is particularly directed to hole boring apparatus which includes a drilling mechanism which is pivotally mounted upon a movable vehicle such as a track laying crane or the like. The present invention is particularly designed to comprise a small compact package unit which may be mounted on existing crane structures either large or small. It is evident that the invention may be mounted on any other type of vehicle, if desired.

The present invention incorporates a novel structural arrangement whereby the drive means is mounted upon an engine frame which is pivotally supported in a unique manner at one portion of a vehicle. This novel mounting arrangement for the drive mechanism is adapted to eliminate the extended drive mechanisms previously used in the art. This novel mounting of the drive mechanism additionally affords great visibility to the operator since the entire drive mechanism is positioned a substantial distance outwardly from the cab of the vehicle and in an elevated position such that the operator can readily see just where the drilling mechanism is disposed.

The drive arrangement of the present invention is also of such a nature that there is no necessity for providing means for pressing the drilling mechanism in a downward direction so as to eliminate so-called downpressure as has been common practice in the prior art since such downward pressing mechanism necessarily adds substantially to the weight of the apparatus and the drive transmitting means incorporates a high degree of friction in such arrangements.

The prior art mechanisms of this nature have also suffered from the disadvantage that the angle of drilling can not be selectively adjusted and accordingly the present invention has been particularly designed so as to permit drilling at various angles.

Additionally, the novel mounting of the drive mechanism of the present invention permits adjustment of the distance in front of the vehicle at which the drilling is carried out. This, of course, is advantageous since there may be limitations as to the amount of movement possible with the vehicle and with the arrangement of the present invention the distance at which the drilling is carried out forwardly of the vehicle may be adjusted to compensate for any such limitations. Furthermore, the mounting means has leveling ability, so in other words is adjustable to compensate for unevenness of the ground supporting surface.

In addition, the present invention is adapted to be remotely controlled from the cab of a crane or the like whereby the entire operation may be carried out by a single operator. This, of course, substantially increases the eificiency of the operation and limits the necessity of providing additional personnel for carrying out related duties.

The present invention utilizes a conventional Kelly bar drive arrangement, the Kelly bar being so mounted that it is freely vertically movable relative to the drive means, while at the same time the drive means is adapted to provide a positive drive to the Kelly bar means.

This driving arrangement is such that the Kelly bar may be easily replaced or withdrawn if necessary so that the rotational drive means may be dismantled if it is required to replace any of the parts thereof.

The novel drive connection to the Kelly bar also provides a wide gripping area for engaging the side walls of the Kelly bar, a greater area being presented in the normal forward direction than in the reverse direction since the device of course is normally operated primarily in a forward direction wherein the greatest loading is present. Accordingly. the drive connection is especially designed to more readily absorb such driving loads when driving in a forward direction. The Kelly bar shaft of the present invention may readily have attached thereto different types of drill or excavating members, such as angers, hole saws, belling and bailing buckets and the like. The Kelly bar may be a single Kelly bar or a double or triple telescoping one as desired, the driving head being designed to accommodate each of these types.

An object of the present invention is to provide a new and novel drilling apparatus incorporating a driving mechanism in a small compact package unit which can be readily mounted on different types of cranes.

Another object of the invention is the provision of drilling apparatus which eliminates the extended drive mechanisms employed in the prior art and which further provides greater visibility.

A further object of the invention is to provide drilling apparatus wherein no auxiliary means is required for pressing the drilling mechanism in a downward direction to produce down-pressure.

Still another object of the invention is to provide drilling apparatus so constructed as to permit drilling at many different angles.

A still further object of the invention is to provide drilling mechanism wherein the distance at which the drilling is carried out forwardly of the vehicle may be readily adjusted.

Yet another object of the invention is to provide drilling apparatus wherein the drive mechanism and controlling means for positioning the drilling means may be remotely controlled from the operators cab to enable the apparatus to be elfectively operated by one man.

Yet a further object of the invention is to provide hole digging apparatus including drilling means which is freely vertically movable and which has a positive driving connection with a wide gripping area so as to ensure an elfective driving connection.

Other objects and many attendant advantages of the invention will become apparent when considered in connection with the specification and accompanying drawings; wherein:

FIG. 1 is a side elevation of the hole drilling apparatus of the present invention illustrating the drilling means in an elevated position;

FIG. 2 is an enlarged fragmentary side elevation of the lower portion of the apparatus;

FIG. 3 is an enlarged fragmentary front view of the hole drilling apparatus of the present invention, with parts broken away and in section and substantially illustrating the control system of the apparatus;

FIG. 4 is a sectional view taken substantially along line 44 of FIG. 3 looking in the direction of the arrows;

FIG. 5 is an enlarged section taken substantially on line 55 of FIG. 2 looking in the direction of the arrows;

FIG. 6 is an enlarged section taken substantially on line 6-6 of FIG. 2 looking in the direction of the arrows and somewhat schematically illustrating the vertically movable shaft in a gripped relationship with the roller means whic impart rotation to the shaft;

FIG. 6A is a view similar to FIG. 6 on a still larger scale and illustrating the details of construction of the roller drive means.

Referring now to the drawings wherein like reference characters designate corresponding parts throughout the several views, there is shown particularly in FIG. 1 a self-propelled vehicle or hole digging apparatus such as a crawler-type crane which is indicated generally by reference numeral 10. A cab 11 is pivotally mounted above the endless track 12, the operator being positioned within the cab during operation. It is evident that the invention could also be employed with a non-revolving type winch and tower mechanism.

A crane or boom 14 is pivotally connected to the front end of the vehicle, and a telescoping boom stop means 15 is connected between the boom and the cab and permits free forward pivoting of the boom but limits the rear movement of the boom. It will be noted as seen in FIG. 1 that the boom is substantially at its rearward limit of movement as determined by the boom stop means. Where the invention is employed on trucks or other types of vehicles, the above structures may be dispensed with.

A support cable 16 is connected to the upper end of the boom and a pulley 18 is connected to the lower end of this cable. Pulley 18 is in turn connected with a control cable 19 which extends into the cab and which may be operated by suitable control mechanism.

The upper end of the boom is provided with a rotatable sheave 20 which carries a cable 21 extending into the cab and connected with a suitable lifting and lowering mechanism. The terminal end of cable 21 is provided with a swivel member 22 to which is connected an elongated shaft 23. The shaft 23 is commonly known in the art as a Kelly bar and is substantially square in cross section, having opposite and parallel side walls 25 and 26 (see FIGS. and 6). The shaft 23, because of the swivel member 22, can be rotated or turned-about is longitudinal axis without twisting the cable 21. The cable 21 is controlled by the operator within the cab by well known means so as to feed out the cable to vertically lower the shaft 23 or to feed in the cable 21 into the cab to raise or elevate the shaft 23 as desired.

Pivotally disposed on the front end of the cab is a rigid frame member 27. The rear of frame 27 is pivotally connected by a horizontal pin 28 to spaced brackets 29 secured to the front lower end of the cab 11 to permit the frame 27 to be pivoted or raised and lowered about the pin 28. The outer or front end of frame 27 has pivotally connected thereto by a pin 30 a base member or engine frame 31.

The base 31 comprises a rigid substantially horizontal rectangular structure, as best seen in FIG. 4, on which is mounted an internal combustion engine 32. The internal combustion engine is provided with a torque converter 34 or torque multiplier (see FIG. 3) operatively connected to its drive shaft, not shown. The torque converter 34 is connected to a horizontally extending universal joint shaft 35, which in turn has its outer end operatively connected to a power shift transmission or a manually shifted transmission indicated by reference numeral 36. This power shift mechanism may be of a conventional construction. For the purpose of illustration, the power shift transmission shown is identified as the 2,000 series power shift transmission, 4 speed forward and 4 speed reverse with range shift which is designed for use with the Clark C270 series torque converter, this power shift transmission being manufactured by the Clark Equipment Co., Jackson, Michigan. A brake 37 is operatively connected with the power shift transmission and the output :of the transmission is operatively connected to a lower horizontal shaft 39, this latter shaft being driven in a forward or reverse direction by remote control mechanism hereinafter described which may be operated by an operator in the cab of the vehicle. The drive shaft 39 is generally disposed below the universal joint shaft 35 and extends in a generally horizontal direction, as is best shown in FIG. 3. The outer end of the drive shaft 39, or the end thereof disposed opposite the transmission device 37 is provided with a small bevel gear 40 (see FIG. 4) which meshes with a large bevel gear 41 (See FIG. 4) carried in a housing 42 mounted on the engine base 31 so as to rotate the bevel gear 41. The gear 41 is mounted on a stub shaft 43 journalled in a bearing 44 so that it can rotate with respect to its housing 42 and base 31. The gear 41 has a horizontal shaft 45 (see FIG. 4) fixed thereto for rotation therewith, and the outer end of the shaft 45 has a small bevel gear 46 fixed or secured thereto for rotating or driving an enlarged horizontal bevel gear 47 to rotate the Kelly bar 23.

Referring to FIG. 4, it will be seen that the portion of shaft 45 and gears 46 and 47 are enclosed in a housing 49 mounted or secured to the front wall 50 of the engine base member 31. The gear 47 is fixed to a central sleeve member 51 extending therethrough and journalled in tapered roller bearings 52 and 53 (see FIG. 3) disposed adjacent its upper and lower ends respectively, so that the gear 47 and sleeve 51 may be rotated with respect to the housing 49. A cylindrical member or collar 54 is secured to the peripheral flange 55 disposed on the upper end of sleeve 51 for rotation with the sleeve and gear 47.

A bumper mechanism indicated by reference numeral is bolted to the lower end of housing 49 and extends downwardly therefrom, an annular seal 86 being provided between the bumper mechanism and sleeve member 51. The bumper mechanism serves to protect the lower end of sleeve 51 as well as the seal and tapered bearings 53 against damage upon raising the Kelly bar and drilling tool. This bumper mechanism ensures that the lower end of the drive mechanism will not be injured at any time during operation of the mechanism even if the operator is careless in raising the Kelly bar and drilling tool.

Collar 54 has upstanding ears or lugs 56, 57 secured thereto, these lugs as seen in FIGS. 5 and 6 being substantially L-shaped in plan configuration and being disposed on the member 54 so that they define two pairs of spaced parallel legs 56 and two pairs of spaced parallel legs 57, each pair of legs receiving and rotatably supporting horizontal roller pins 58.

As seen in FIGS. 5 and 6, each of roller pins 58 rotatably supports a driving roller 59, these rollers being shown somewhat schematically in these two figures.

Referring now to FIG. 6A, the actual construction of the roller pins 58 and the rollers 59 supported thereon is shown in detail. As seen in this figure, each of roller pins 58 is provided with a pair of spaced roller bearings and 91 which serve to rotatably journal the associated roller thereon, the roller being provided with an inwardly projecting annular portion 92 which fits between the roller bearings. In addition, a thrust bearing 95 is provided at one end portion of each of rollers 59,

members

96 and 97 being provided for retaining grease and exc luding dirt or other foreign matter.

Each of rollers 59 is provided with a forward driving surface 100 which adjoins with a flat portion 101 at the central part of the roller which in turn is joined with a reverse driving surface 102 at the opposite end of the roller. The flat surfaces 101 at the central portion of the rollers define a surface which is substantially parallel with the longitudinal axis of the associated roller. Flat surfaces 101 are engaging surfaces used when raising or lowering the Kelly bar. These surfaces are not employed when driving the Kelly bar in a forward or reverse direction, but act as protection or buffers for

surfaces

100 and 102. Forward driving surface 100 slopes inwardly toward one end of the roller at an angle of approximately 10 with respect to the flat surface, the reverse driving surface 102 sloping toward the opposite end of the roller at an angle of approximately 7 degrees to the flat surface of the associated roller.

The forward driving surface is so designed as to be of a greater extent longitudinally of the roller than the reverse driving surface 102, and as seen in FIG. 6A, the forward driving surfaces of each of the rollers is in contact with the Kelly bar, it being noted that as seen in this figure, the driving rollers 59 will normally be carried in a clockwise direction as indicated by the arrow. The flat surfaces on the driving rollers permit shifting of the Kelly bar into engagement with the reverse driving surfaces 162 when the driving rollers are carried in a counter clockwise or reverse drive direction.

As pointed out previously, the arrangement is such that a maximum amount of driving surface is provided in a normal forward driving direction, and a smaller driving surface is provided in the reverse driving direction.

As seen in FIGS. 5 and 6, the Kelly bar 23 extends through the space 62 defined between the rollers, and as seen in FIG. 3, the Kelly bar is adapted to extend a substantial distance both above and below the driving rollers. It is apparent that the driving roller arrangement is such that a very good positive driving connection is provided between the rollers and the Kelly bar shaft While at the same time the Kelly bar shaft is readily adapted to move upwardly or downwardly in a vertical direction since the driving rollers are rotatably supported by the roller pins 58.

It is apparent that the driving rollers in effect act like the jaws of a wrench to engage each of the four side Walls of the Kelly bar when the drive means is actuated while at the same time permitting the aforementioned free vertical movement.

The lower end of the Kelly bar may be provided with a screw type auger 76 as shown in FIG. 1 fixed thereto for rotation therewith to drill a hole in the ground or the like, or may have attached thereto a Well known belling bucket 71, or any other type of boring device.

As seen particularly in FIGS. 1 and 2, a hydraulic ram 73 has the cylinder 105 thereof pivotally connected to a lug 106 at the end of frame member 27 while the piston of this ram is connected with a rod 107 which is in turn pivotally connected with a lug 1138 fixed to the engine base 31. It is apparent that operation of the hydraulic ram 73 will serve to adjust the angular relationship between frame member 27 and base member 31.

A pair of hydraulic lines 189 and 110 are connected with ram 73 for selectively operating the ram, these lines 1139 and 110 as seen in FIG. 3 being connected with a solenoid valve means 111 which is in turn connected with a suitable source of hydraulic pressure for operating the ram. Solenoid valve 111 is adapted to be remotely controlled by a central control box 115 mounted in the cab of the vehicle, this connection being indicated schematically by line 116, the control box including a manually operable control 117 for remotely controlling solenoid valve 111 in a well-known manner.

It is apparent that other types of remote control may also be used in the invention, the solenoid or electrically controlled hydraulic system being shown for the purpose of illustration.

For lifting and lowering the drive mechanism, a hydraulic ram 83 is provided, this ram as seen in FIG. 3 having the lower end of the cylinder thereof pivotally connected with a link 1213 which is in turn pivotally connected to an ear 121 secured to the outer surface of casing 49. The piston of ram 83 is connected with a rod 122 which in turn is pivotally connected with a link 123 which has the terminal end of a cable 124 pivotally connected thereto.

Cable 124 passes upwardly over a sheave 125 which is swivelly supported at 126 to the boom, cable 124 as seen in FIG. 3 then passing downwardly and being pivotally connected to a link 123 which in turn pivotally connected with an ear 129 connected to the outer surface of casing 49.

the drilling and driving means at will.

A pair of

hydraulic lines

130 and 131 are connected to opposite ends of ram 83 and are adapted to operate the ram so as to lift or lower the driving mechanism as will be clearly understood. As seen in FIG. 3, lines 13% and 131 are connected with a solenoid valve 133 which is in turn connected with control box 115 as indicated schematically by line 135 such that solenoid valve 133 may be remotely operated by the manual control means 136 provided at the control box. The brake 37 associated with the power shift transmission 36 is operated by solenoid valve 140 which is connected to the control box as schematically illustrated by line 141 so as to be remotely operated by manual control mechanism 142 at the control box.

The power shift transmission also includes a mechanical range shift operating means 144 which is operated by solenoid valve 145 which in turn is connected with the control box as schematically indicated by line 146 to per mit remote control of the range shift means by manual control means 147 at the control box. The power shift transmission is also provided with a forward and reverse control means indicated by reference numeral 15% which is operated by a solenoid valve 151 which is connected as indicated schematically by line 152 with the control box 115 so as to permit remote control thereof by a manually operated means 153. The power shift transmission is further provided with a high and low speed control means 155 which is operated by a solenoid valve 156 which is also connected with the control box as schematically indicuted by line 157 so as to be controlled by manually operated means 158 at the control box.

In operation, the vehicle is first maneuvered to the desired position, and rams 73 and 83 may be remotely controlled from the cab by the operator so as to properly position the drilling means and the associated driving means.

The internal combustion engine is then started either by suitable remote control means or by a control means at the area of the motor. The operator can then control the operation of the device from the remote control box 115 in the cab and through the connection shown in FIG. 3 is enabled to control the speed as well as the direction of rotation of the Kelly bar and furthermore to position The system provides complete remote control of all operations and functions including speed changes of the motor from the remote position in the cab.

The drive will be transmitted from engine 32 through the torque converter 34 and shaft 35 to the power shift transmission 36 and thence through shaft 39 and bevelled gear set 40 and 41 to the shaft 45. The shaft 45 through the intermediary of bevel pinion 46 drives bevel ring gear 47 and sleeve 51. Sleeve 51 in turn rotates the drive rollers 59 which grip the outer surfaces of the Kelly bar so as to positively drive the Kelly bar and the auger 71) fixed to the lower end thereof so as to bore a hole in the ground.

The elevation of the Kelly bar is controlled from the cab by the operator, the Kelly bar being either raised or lowered as desired. It is not necessary to provide a mechanism for pressing the drive means downwardly or provide down-pressure since the auger will provide a strong pulling force augmented by the weight of the Kelly bar and the tool and the non-resistance of the driving head to vertical travel of the Kelly bar which will tend to pull the mechanism downwardly when driven in the forward drilling direction.

It is evident that various types of drilling or boring devices or other suitable mechanisms may be readily attached to or detached from the lower end of the Kelly bar as desired. It is apparent that the pivotal mounting of the drive means enables the provision of a small compact package unit which can be mounted on various types of cranes, and extended drive mechanisms are eliminated since the drive mechanism is wholly mounted in the im- 7 mediate vicinity of the Kelly bar itself. Additionally, by mounting theentire driving and drilling mechanism in a compact arrangement forwardly of the vehicle in the man ner illustrated, the operator is afforded a maximum degree of visibility.

The ram 83 enables the raising and lowering of the drilling mechanism and the angularity thereof may be readily adjusted through the intermediary of the ram 73 which permits drilling at various angles. in addition, the cooperation between the ram 73 and ram 83 enables the distance at which the drilling is carried out forwardly of the vehicle to be adjusted to permit fore and aft leveling of the device to compensate for unevenness of the terrain, it being understood that the Kelly bar will transmit drive to the auger regardless of the relative position of the driving rollers 59 with respect to the auger or other drilling or boring device. It will be noted that the plane position of the driving head relative to the Kelly bar remains constant at all times regardless of depth or angle.

The entire operation may be remotely controlled from the cab of the Vehicle whereby the position of the drilling mechanism as well as the speed and direction of rotation may be readily controlled. The inside diameter of the sleeve 51 is substantially greater than the cross sectional thickness of the Kelly bar shaft 23, as shown in FIG. 3. Consequently, the Kelly bar shaft may be freely moved vertically with respect to the driving rollers and the Kelly bar shaft may be easily replaced or withdrawn so that the rotational drive means can be dismantled if desired. The drive also provides a wide gripping area particularly in the driving direction so as to increase the efficiency of operation.

As this invent-ion may be embodied in several forms without departing from the spirit or essential characteristics thereof, the present embodiment is therefore illustrative and not restrictive, and since the scope of the inven tion is defined by the appended claims, all changes that fall within the metes and bounds of the claims or that form their functional as well as conjointly cooperative equivalents are therefore intended to be embraced by those claims.

I claim:

1. In combination, a vehicle having a cab and an adjustable boom, an adjustable base member, articulated connecting means operatively interposed between said base member and said cab, power operated means for raising and lowering said base member, and power operated means for adjusting the relative angular relationship of said base member with respect to said cab independently of the position of said boom, a vertically movable elongated shaft carried by said boom, a vertical sleeve member carried by said base member and having an opening of substantially greater diameter than the thickness of said shaft, said shaft extending through said opening, hering means secured to the lower end of said shaft for rotation thereby, tapered rollers fixed to said sleeve member engaging the sides of said shaft to permit vertical movement of said shaft with respect to said sleeve member while engaging said shaft for rotation thereof, and drive means on said base member operatively connected to said sleeve member to rotate it and said shaft.

2. Boring and drilling apparatus comprising in combination a vehicle having a cab and an adjustable boom supported there-on, an elongated driving shaft adjustably supported by said boom, a frame member pivotally supported by said vehicle, a base means pivotally supported by said frame member remote from the point of pivotal attachment of said vehicle, driving mechanism for said elongated shaft supported solely by said base means and drivingly interconnected with said shaft so as to transmit rotation to said shaft but permitting verical movement of said shaft relative to said driving mechanism, first power operated means for raising and lowering said base means, second power operated means having part-s thereof pivotally interconnected with said frame member and said base member for adjusting the angularity of said frame member with respect to said base means, and means adjacent said cab and available to an operator in said cab for remotely controlling the operation of said first and second power means to control the operating posit-ion of said driving means.

3. Apparatus as defined in claim 2, wherein said driving mechanism includes means for controlling the speed and direction thereof, and means adjacent said cab and available to an operator within said cab for remotely controlling the speed and direction of movement of said driving mechanism.

4. Apparatus as defined in claim 2, wherein said power means for raising and lowering said base means comprises a hydraulically operated ram having one end thereof connected with said base means, a sheave supported by said boom, a flexible cable passing over said sheave and having one end thereof connected to the opposite end of said ram, the opposite end of said cable being connected with said base means.

5. Apparatus as defined in claim 2, wherein said second power means comprises a hydraulically operated ram having a cylinder member and a piston rod member, one of said second power means members being pivotal-1y connected with said frame member and the other of said second power means member being pivotally connected with said base members.

References Cited by the Examiner UNITED STATES PATENTS 1,904,249 4/1933 Powell et al. 173-22 1,957,999 5/1934 Goldsborough et at. 17343 1,971,922 8/1934 Smith 173163 2,081,200 5/1937 H-ollingsworth 173l41 2,140,659 12/1938 Vock 6423.7 2,144,156 1/1939 Johnson 6423.7 2,510,719 6/1950 Shaffer 6423.7 2,743,904 5/1956 Scott 17343 3,089,550 5/1963 Watson 173151 BROUGHTON G. DURHAM, Primary Examiner.

Claims

1. IN COMBINATION, A VEHICLE HAVING A CAB AND A ADJUSTABLE BOOM, AN ADJUSTABLE BASE MEMBER, ARTICULATED CONNECTING MEANS OPERATIVELY INTERPOSED BETWEEN SAID BASE MEMBER AND SAID CAB, POWER OPERATED MEANS FOR RAISING AND LOWERING SAID BASE MEMBER, AND POWER OPATED MEANS FOR ADJUSTING THE RELATIVE ANGULAR RELATIONSHIP OF SAID BASE MEMBER WITH RESPECT TO SAID CAB INDEPENDENTLY OF THE POSITION OF SAID BOOM, A VERTICALLY MOVABLE ELONGATED SHAFT CARRIED BY SAID BOOM, A VERTICAL SLEEVE MEMBER CARRIED BY SAID BASE MEMBER AND HAVING AN OPENING OF SUBSTANTIALLY GREATER DIAMETER THAN THE THICKNESS OF SAID SHAFT, SAID SHAFT EXTENDING THROUGH SAID OPENING, BORING MEANS SECURED TO THE LOWER END OF SAID SHAFT FOR ROTATION THEREBY, TAPERED ROLLERS FIXED TO SAID SLEEVE MEMBER ENGAGING THE SIDES OF SAID SHAFT TO PERMIT VERTICAL MOVEMENT OF SAID SHAFT WITH RESPECT TO SAID SLEEVE MEMBER WHILE ENGAGING SAID SHAFT FOR ROTATION THEREOF, AND DRIVE MEANS ON SAID BASE MEMBER OPERATIVELY CONNECTED TO SAID SLEEVE MEMBER TO ROTATE IT AND SAID SHAFT.