US2315628A

US2315628A - Hoisting apparatus

Info

Publication number: US2315628A
Application number: US322708A
Authority: US
Inventors: Robert C Lamond
Original assignee: American Engineering Co Ltd
Current assignee: American Engineering Co Ltd
Priority date: 1940-03-07
Filing date: 1940-03-07
Publication date: 1943-04-06
Anticipated expiration: 1960-04-06

Description

April 6, 1943. R. c. LAMOND HOISTING'APPARATUS Filed March 7, 1940 3 Sheets-Sheet l Im/Erl TDR RUERT E. L

I www April 6, 1943 R. c. I AMOND l 315,628

HOISTING APPARATUS Filed March 7, 1940 5 Sheets-Sheet 2 Im/EHTDR 'RDDERT E. mund @w/.Zum

ITTDRUEJ April 6, 1943. R. c. LAMGND HOISTING APPARATUS 1940 3 Sheets-Sheet 3 Filed March 7 m Q TL .m mE m w WT T HH A 4 E G o 9 R M r, W. ,S

Patented Apr. 6, 1943 anatre HOISTIN G APPARATUS Robert C. Lamond, Philadelphia, Pa., assigner to American Engineering Company, Philadelphia, Pa., a corporation of Pennsylvania Application March 7, 1940, Serial No. 322,798

4 Cla-ims.

This invention relates to Winches, and more particularly to certain safety devices, control mechanisms and overhauling devices associated with Winches.

One object of the present invention is to provide in a winch an overhauling device which insures proper movement of the hook end of the cable and prevents undue slack from occurring between the various pulleys of the winch disposed between the drum and the hook.

A further object is to provide in an overhauling device of the type described, a control mechanism which functions to condition the device for operation when the cable is being paid out and to disconnect the device when the cable is being Wound in.

Another object is to provide a novel locking device for the hydraulic operating mechanism for Winches which prevents operation of the controls therefor from a neutral position until manually released, and also until an associated brake is released, thereby preventing undue pressure conditions in the hydraulic system.

A further object is to provide a generally improved and simplified winch construction which insures best eiliciencies under all conditions of operation.

Other and further objects will become apparent as the description of the invention progresses.

Of the drawings:

Fig. l is an elevational view of the entire winch construction With parts removed to more clearly illustrate certain operating parts of the associated overhauling device.

Fig. 2 is a plan view of the cable overhauling mechanism with parts removed to show certain of the elements thereof.

Fig. 3 is a sectional elevational View taken substantially along line 3-3 of Fig. 2.

Fig. l is an end view of aswitch mechanism and operating means therefor for controlling the operation of the overhauling device.

Fig. 5 is a View partly in section, taken substantially along line 5 5 of Fig. 4.

Fig. 6 is a diagrammatic View oi the electrical control circuit of the Winch and overhauling device associated therewith.

Fig. '7 is a sectional elevational view of the control wheel for the pump end of the hydraulic operating mechanism, having associated therewith a locking mechanism and a switch operating device.

Fig. 8 is a View partly in section taken along line 8 8 of Fig. '7, and

`Fig. 9 is a fragmentary sectional view showing the switch operating mechanism and locking device for the control Wheel shown in Figs. 7 and 8 in operated position.

Referring to the drawings, the numeral l designates generally a crane consisting of a mast 2 and a boom 3. A Winch indicated generally at 4, Winding in and paying out cable is disposed in the present instance beneath the mast 2 and a supporting platform or deck 5. The mast 2 extends through and is rotatably supported in an upper platform or deck 5, and the lower end thereof is mounted in any suitable bearing indicated generally at l. A portion B depends from the lower end of the mast 2 and has secured thereto a large gear 9 which meshes with a pinion I9 provided intermediate the ends of a shaft I l driven by any suitable power mechanism l2. By operating power mechanism l2 in one direction, the mast 2, and consequently the boom 3, may be swung in one direction and when the operation of said power mechanism is reversed the mast and boom are actuated in the reverse direction. The specific operating mechanism for the mast just described, forms no part of the present invention, and accordingly a detail description thereof is unnecessary.

Boom 3 is pivotally supported on the mast 2 at I3, and a tie rod 3', extending between the upper end of mast 2 and a point intermediate the ends of the boom affords an additional support for the boom.

The Winch 4 consists of a cable winding drum i4 mounted on any suitable shaft i5, journaled in side frames I6 (only one of which is shown). The outer end of shaft l5 has secured thereto a gear Il which meshes With a pinion I8 secured to a second shaft i9. Shaft I9 has also secured thereto a worm Wheel 20 which meshes with a worm gear 2| secured to a drive shaft 22 of a fluid motor 23. The outer end of shaft 22 is journaled in any

suitable bearings

24, 24. A braking mechanism indicated generally at 25 normally holds drive shaft 22, and consequently motor 23, against operation, as will appear more fully hereinafter. Fluid for operating motor 23 is delivered by a pump 26 through pipes 28 and 28'. Pump 25 may be driven by any suitable electric motor 2l. Pump 26 and motor 23 may be of reversible discharge type of any well known construction, such, for example, as that shown in the patent to Hele-Shaw, No. 1,077,979, granted November ll, 1913, to which reference may be had for a full description thereof.

The stroke of pump 2&3 may be varied by means of a control shaft 2! extending through deck 5 and journaled in any suitable manner in a standard 38 suitably supported on deck 5. The upper end of shaft 29 has secured thereto in any suitable manner a control wheel 3|.

Control wheel 3| has associated therewith locking means which will be more fully described hereinafter, which, when the pump is on neutral stroke, automatically locks the wheel against movement. However, when this locking means is released wheel 3| may be turned in either direction. When wheel 3| is turned in one direction, the stroke of pump 26 will be so adjusted as to cause a rotation of motor 23 and consequently of drum I4, in such a direction as to pay out the cable 34, and when control wheel 3| is turned in the reverse direction from a neutral position the stroke controls of pump 26 will be so adjusted as to cause a reverse operation of motor 23, and consequently of drum I4, causing the latter to wind in the cable 34.

As shown in Fig. l, the cable 34 wound on drum I4 extends under a sheave 35 mounted in any suitable bearings 36, disposed adjacent drum I4,

and then extends upwardly through the hollowv interior of mast 2 and over a sheave 31, rotatably mounted near the upper end of said mast. Cable 34 then extends over a sheave 38 rotatably mounted intermediate the ends of boom 3 and then extends between

sheaves

39 and 48 of a cable overhauling device indicated generally at 4 The cable then extends over a sheave 42 rotatably mounted at the outer end of boom 3, and has a hook 43 attached to the outer end thereof..

Referring more particularly to Figs. '7, 8 and 9, it will be noted that wheel 3| has pivoted to a vertically extending bracket 44 secured to one side thereof, a latch releasing lever 45. Pivoted in any suitable manner at 46 on lever 45 is a plunger 41 operating in a cylindrical bore 48 provided in the rim of wheel 3|. The lower end of plunger 41 engages the upper end of a locking lug 49 which normally extends into the lower end of bore 48, and also into the enlarged end of a recess 50 extending through the rim of an internal gear Recess 50 and bore 48 coincide when the stroke controls of pump 26 have been adjusted by wheel 3| to neutral position. Under these conditions locking lug 49 is urged upwardly by a rod 52, extending through openings provided at the upper and lower ends of the cylindrical portion 53 of a bracket 54, the upper reduced end of said rod also extending through the lower reduced portion of recess 50. Bracket 54 may be secured in any suitable manner to the standard 38'. As shown more particularly in Figs. 7 and 9, a coil spring 55 is provided within the cylindrical portion 53 of bracket 54 and extends between an upper spring seat 56 secured to rod 52, and a lower spring seat 51 loosely mounted on said rod. The lower end of rod 52 is secured in any suitable manner to a coupling 58 the lower end of which is attached in any suitable manner to an arm 59 provided for the purpose of actuating certain switches provided within a box 68 secured in any suitable manner to the standard 35. A description of the switches provided in box 38 will appear more fully hereinafter.

From the foregoing description it is seen that to release wheel 38 for operation, lever 45 is simply urged downwardly to the position shown in Fig. 9. By this action plunger 41 urges locking lug 49 out of the bore 48 of wheel 3|. By this movement of locking lug 49 the upper end of rod 52 is moved out of the recess 58. Wheel 3| is now free to rotate in either direction.

Referring to Figs. 7 and 8, it will be observed that shaft 29 has secured thereto in juxtaposition with the internal gear 5| a pinion 6| which meshes with a gear 62, journaled on a stud 63, mounted in any suitable manner in an arm 64 secured near the upper end of standard 38. Gear 62 meshes with a second gear 65 journaled on a stud 86, also secured in any suitable manner near the outer end of arm 84. Gear 65 meshes with internal gear 5|. The lower surface 61 at the bottom of the rim of wheel 3| is fiat, and consequently when wheel 3| is turned when locking lug 49 is in the position shown in Fig. 9, the said lug will now be held in that position by the engagement with the smooth unbroken surface 61 of said wheel. The lower surface 68 of the rim of internal gear 5| is also flat, and consequently the upper end of rod 52 is held in the position shown in Fig. 9 by engagement with the surface 68. Now, upon movement of wheel 3| in either direction internal gear 5| is rotated through gears 6|, 62 and 65. The gear reduction between wheel 3| and internal gear 5! may be such that three full turns of wheel 3| are required to cause one rotation of gear 5|. The purpose of this reduction is to insure proper operation of the pump controls from neutral position to full stroke in either direction, since in the present instance three full turns of wheel 3|, and consequently of shaft 29, may be necessary to actuate the pump controls, as stated, from neutral position to full stroke in either direction. Thus by employing such a gear ratio between Wheel 3| and internal gear 5| locking lug 49 and rod 52 will remain in the position shown in Fig. 9 during the movements of wheel 3| just described. However, when wheel 3| has been so operated as to return the pump controls to neutral position recess 50 will register with bore 48, and consequently spring 55 will urge rod 52 upwardly bringing the reduced upper end thereof into said recess 59 and causing locking lug 49 to extend partly into bore 48 and partly in recess 58. Thus both the wheel 3| and gear 5| are locked against further movement. To release wheel 3| and gear 5| for operation, it will now be necessary to again urge lever 45 downwardly to the position shown in Fig. 9, at which time the wheel 3| may again be rotated in either direction.

As shown in Fig. l, shaft 29 has secured thereto a gear 69 which meshes with an enlarged gear 69 mounted for rotation on a shaft E9" suitably journaled in a bracket 69', secured in any suitable manner to the casing of a switch 13, which in turn is secured to the lower surface of deck 5. Shaft 59 has also secured thereto a cam 18 which, as shown more particularly in Figs. 4, 5 and 6, is adapted to engage a cam follower 1| provided at one end of arm 12 of a bell crank lever 12. Bell crank lever 12 is adapted to actuate switch 13, which controls the operation of the electric motor 14 associated with the overhauling device 4| which will now be described in detail.

Referring more particularly to Figs. 2 and 3, it will be observed that the shaft 15 of motor 14 has secured thereto a worm gear 16, meshing with the worm wheel 11, keyed to the hub 18 of a clutch member 19. Hub 18 of clutch member 19 is loosely mounted on a collar 88 provided on a shaft 8| which is suitably mounted in bearings 82, 83, 84 and |86 provided in the casing bracket 85 of overhauling device 4|. The enlarged portion 86 of shaft 8| extending between bearings 82 and 83 has keyed or otherwise secured thereto member 93 and a spring seat 98 which engages the lower end of bolt 95. Thus, by adjusting bolt 95 the pressure of spring 91 may be varied. By this arrangement it is seen that spring 91 normally tends to urge member 93, and consequently shaft 90, downwardly. The left hand end of shaft 90 has secured thereto sheave 39 which is slightly spaced from sheave 40 mounted near the left hand end of shaft 9| and disposed between bearings 83 and 84. It therefore is seen that by means of spring-urged member 93, sheave 39 is brought into frictional engagement with the cable 34.

Slidably mounted on shaft 8| adjacent clutch element 19 is a complementary clutch element |00. The enlarged portion of clutch element |00 has provided therein a circular groove |02 for receiving lugs |03, |03, extending inwardly from a pair of rods |04, |04. Rods |04, |04 extend through openings provided in the wall |06 of casing 85, and are secured in any suitable manner, such as by bolts |01, |01 to a crosshead |08. Crosshead |08 is secured in any suitable manner, such as by a nut |09 to a rod ||0 slidably mounted in the end wall of casing I||'.

The outer end of rod ||0 has secured thereto a fi.

bifurcated member ||2 to which is pivotally attached intermediate its ends a lever ||3. Lever |3 is pivoted at its lower end at I4. The upper end of lever 3 is pivoted to one end of a link ||5, the other end of which is pivotally attached to the core ||6 of a solenoid |I1. Extending between wall |06 and crosshead |08, is a coil spring ||8. Spring ||8 tends to urge crosshead |08 and rods |04, |04, and consequently clutch element |00, to the right. To limit the movement of lever ||3 and the associated elements an adjustable stop ||9 is provided. This stop extends through a threaded aperture provided near the upper end of a vertical member and is adapted to engage the outer side of vertical lever ||3 when the latter has been actuated to the right (Figs. 2 and 3) by spring ||8.

From the foregoing description it is seen that upon energization of solenoid ||1 lever ||3 is urged to the left. This causes movement of crosshead |08 and rods |04, |04, against the pressure of spring ||8, and consequently clutch element |00 is brought into engagement with the complementary clutch element 19, thereby connecting worm wheel 11 to shaft 8|. Any movement of motor 14 now causes rotation of worm 16, worm. wheel 11. and shaft 8|. Upon operation of shaft 8|

sheaves

39 and 40 are actuated, thereby causing paying out of cable 34 and any slack in the cable is immediately taken up. Motor 14 operates in one direction only. When the wheel 3| is turned to condition the winch to wind in cable, motor 14, as will appear more fully hereinafter, will be disconnected from the circuit. Upon deenergization of solenoid ||1 spring ||8 will urge clutch element |00 out of engagement with element 19. Consequently motor 14 is now disconnected from shaft 0| and any movement thereof will simply cause clutch element 19 to rotate about sleeve 80 without imparting any movement to shaft 8| Referring more particularly to the Wiring diagram shown in Fig. 6, the operation of the mechanism as a whole will be understood. Current from any suitable source enters the system through bus bar L1 and returns through bus bar L2. Connected to the main circuit is av motor starting circuit which is indicated by the lighter' lines in the diagram. A wire connects bus bar L1 to the pole |26 of a starting switch |21. The other pole |28 of switch |21 is connected to the pole |29 of a normally closed interlocking switch |30 by wire |3|. The other' pole |32 of switch |30 is connected to one end of the coil |33 of a solenoid |34 by a wire |35. A wire |36 connects the other end of coil |33 of solenoid |34 to a Wire |31 connected at one end to the pole |38 of a stop switch |39. The other pole |40 of stop switch |39 is connected to bus bar Lz by a wire |4|. Bus bar L1 is connected to the pole |42 of a single pole switch |43 by a Wire |44. The central pole |45 of switch |43 is connected to motor 21 by a wire |41. Motor 21 is connected to wire |31 by a wire |48. A shunt field |49 of motor 21 is connected across Wires |41 and |48. An insulated arm |50 of single throw switch |43 extends into the groove |5| provided at the end of the core |52 of solenoid |34. Bus bar L1 is also connected to the pole |53 of a second single pole switch |54 by a wire |55. The central pole |56 of switch |54 is connected to wire |35 by a wire |51. The insulated arm |54' of switch |54 extends into the groove |5| of core |52 of solenoid |34. Wire |44 is also connected to the pole 558 of fluid motor brake switch |59 by a wire |60. The other pole |6| of switch |59 is connected to the coil |62 of a solenoid |63 by a wire |64. The other end of coil |62 is connected to wire |31 by a wire |65. Starting switch |21 is normally held in open position by a spring |66 and accordingly, upon release of said switch the spring urges the same to open position. Stopping switch |39 on the other hand is normally held in closed position by a spring |61, and

upon release of the switch button the spring will urge the same to closed position. Interlocking switch |30 and brake switch |59 are enclosed within the casing secured to the standard 38 and are simultaneously operated by arm 59 through the medium or a lever 59 pivoted intermediate its ends and operatively connected to the said switches |30 and |59.

It is also seen that upon .energization lof solenoid |34 single pole switches |43 and |54 are closed, and that upon deenergizationof said solenoid saidv switches are moved to open position by means of a coil spring |1l. A coil spring |12 also assists the spring 10 of the brake mechanism 25 to apply the brake when solenoid |63,

is deenergized.

From the foregoing description it is seen that to start motor 21 in operation the operator simply closes switch |21. When the parts are in the normal position shown in Fig. 6, interlock switch 13%) is closed. The closing of switch l2? also causes energization of solenoid itil which now closes switches Ulli and 56, thereby connecting motor 2l in the circuit. Since stop switch ISQ is normally closed, the circuit between bus bars L1 and L2 is now complete, and the motor 2l is started in operation. When switch Ir is closed it will be seen that by virtue of wire H57 the circuit to the coil 33 of solenoid |34 may be closed even though interlocking switch |39 is subsequently opened. Now when the operator actuates lever 5 downwardly to close brake switch i529 through arm 59, and lever 59', interlocking switch ESG is simultaneously opened. Motor 2?, however, as pointed out before, will continue to operate. Upon closing of brake switch i551 the brake 25 is released by the action of solenoid it@ thereby conditioning i'iuid motor shaft 22 for operation. Upon movement of lever [i downwardly, control wheel 3i and internal gear 5i are also released for operation, as pointed out hereinbefore. Wheel 3l may now be moved in either direction to ehect stroking of pump 25. The electric control mechanism including the starting and stopping switches, the interlock and brake switches, and the single pole switches, as well as the controls for the brake mechanism 25, are fully shown and described in my pending application Ser. No. 302,643, nled November 3, 1939, upon which Fatent No. 2,256,586 was granted on July 29, 194i, and in the specific sense form no part of the present invention.

The control mechanism for the overhauling device which constitutes one of the novel features of the present invention, and which forms a part of the general hookup just depicted, will now be described in detail.

As shown in Fig. 6, the switch i3, which conrols the operation of electric motor llt, and of the solenoid i il of overhauling device lil, is normally closed. Inasmuch as switch l2? is normally open the circuit to motor 'it and solenoid II! consequently is normally open.

Referring more specifically to the specific connections included in this device it will be seen that pole 32 of interlocking switch it is connected to the pole H5 of switch 'i3 by a wire VES. The other pole lll of switch i3 is connected to the iield and armature coils of motor 14 by a wire H3. Motor 'ifi in turn is connected to bus bar L2 by wire i'li. Wire H3 is connected to one end of the coil itil of solenoid lil by wire itil. The other end of coil i3@ is connected to wire HQ by a wire H32.

Motor 'lli may be of a type whose speed may vary directly in accordance with the load t0 which it is subjected. When the load is light the motor will have a relatively high speed, and when the load increases the speed will decrease correspondingly. Thus, in the event any slack should occur in the cable 34 before motor 2? is started, upon closing switch i2? the circuit of motor M will be completed, and consequently said motor will actuate sheaves :it andV lil to operate the cable to the right (Fig. l) and thereby take up the slack in the cable and cause the hook 43 to be lowered toward the object to be hoisted. lit is to be understood that motor 'M operates only when cable is being paid out by drum I4.. When the controls of pump 26 are so adjusted as to cause motor 23 to operate drum il! in the hoisting direction, switch lit will be onen, thereby disconnecting the circuit to motor '54, as Well as to solenoid Ill. During the hoistasiacaa ing operation it is seen that cable Sii will now tend to drive sheaves 39 and 553, and consequently shaft Si. However, it will be remembered that when solenoid lll is deenergized spring H3 operates to disengage clutch elements le and idd. Worm wheel 'El and worm gear and consequently motor la, will not be overhauled since clutch element li? is loosely mounted on collar 8d of shaft Si, and consequently the shaft may move relative thereto.

As shown in Fig. 6, cam 'is is provided with a recessed portion E83 and a concentric portion lli-i. A cam follower 'li is provided at the lower 4arrn l2 (Fig. 6) of bell crank lever 'i2'. The other arm l2 of bell crank lever 12 is pivotally attached to the contact bar |89 of switch '13. Fig. 5 shows the parts in normal position, in which position cam follower 'il engages the concentric portion ISH of cam 'it immediately adjacent the recess thereby holding contact bar S39 in engagement with poles H5 and Ill of switch '33. Upon continued movement of shaft caro follower li will simply ride on the concentric portion of cani lil, and since the gear ratio between shaft 2Q and cam 'i8 is i to 1, and since it will be remembered that three full turns of shaft i will eect actuation of the pump controls to full stroke position, cam 'Eil will not' have made a complete rotation. When the pump controls are returned to neutral again the parts will again 'assume the position shown in Fig. 6. In the event that the pump control should be turned in the reverse direction to cause the winding drum i5'.- to wind in cable, cam it will be moved in a counter-clockwise direction by wheel 3i, bringing the recess 33 thereof opposite the cam follower 'il whereupon the spring 53 will rock lever 'i2' in a clockwise direction (Fig. 6) cansino' movement of bar E89 out of engagement with the poles i'i5 and i'il of switch 13. Upon a continued movement of cam l@ in this direction bell crank lever will be swung in a clockwise direction, bringing bar it@ a further distance away from the poles of switch i3 until cam follower 'Ei engages the concentric portion of the cam (as shown in dotted lines in Fig. 5) when the elements will be held against further movement. Upon movement of bar 588 out of engagement with the poles il and lll of switch 'i3 the circuit to motor as well as to solenoid Ill, will be interrupted. The parts will remain in this position until wheel 3l is so actuated `as to return the controls of pump 2t to neutral position vat which time cam lil and the elements actuated thereby will assume the position shown in Fig. 6.

From the foregoing description it is seen that a highly useful mechanism has been provided. The hand control mechanism for the hydraulic transmission which operates the winch is normally held in neutral position. In order to release this mechanism for operation manual releasing means must be operated. This not only releases the control means for operation, but also causes the brake for the fluid motor shaft to be released, thereby preventing pressure surges in the system. Upon starting of the electric motor for driving the fluid transmission, the overh'auling motor is also conditioned for operation, and consequently any slack that may occur in the cable is immediately taken up before the winch is actuated to pay out cable. lt is also seen that the cable cverhauling device is automatically disconnected when the winch is conditioned to wind in cable. This device is especially asiaece desirable in cases where a small light hook is employed which is incapable of maintaining the cable taut.

The novel means associated with this device for retaining the locking elements in inoperative position during movement of the control Wheel also insures proper operation of the winch under all conditions of operation.

While the embodiment herein shown is 'admirably adapted to fulnll the objects primarily stated, it is to be understood that the invention is not to be limited thereto since it may be embodied in other forms, all coming within the scope of the claims which follow.

What is claimed is:

l. In a device of the class described, the combination of a Winch, means for actuating said winch to wind in or pay out cable, control means for controlling the direction of operation of said Winch, a cable overhauling device adapted to maintain the cable unwound by said winch taut, said overhauling device comprising a pair of sheaves through which the cable extends, means operable on one of said sheaves for urging the same into frictional engagement with said cable, means for simultaneously operating said sheaves to pay out cable, said last mentioned means including an electric motor, gearing disposed between said sheaves land said motor, clutch means for disconnecting said sheaves from said motor, means including a solenoid for engaging said clutch, and resilient means for disengaging said clutch upon deenergization of said solenoid.

2. In a device of the class described, the combination of a winch, means for actuating said Winch to wind in or pay out cable, control means for controlling the direction of operation of said winch, a cable overhauling device adapted to maintain the cable unwound by said Winch taut, said overhauling device comprising a pair of sheaves through which the cable extends, means operable on one of said sheaves for urging the same into rictional engagement with said cable, means for simultaneously operating said sheaves t pay out cable, said last mentioned means including an electric motor, gearing disposed between said sheaves and said motor, clutch means for disconnecting said sheaves from said motor, means including a solenoid for engaging said clutch, resilient means for disengaging said clutch upon deenergization of said solenoid, a normally closed switch for controlling the operation of the said motor and solenoid associated with said overhauling device, a starting switch for said motor, and means operated by the said control mechanism for said winch for opening said normally closed switch when the said control mechanism has been so adjusted as to cause said winch to wind in cable.

3. In a device of the class described, the combination of a Winch, means for actuating said winch to wind in or pay out cable, control means for controlling the direction of operation of said winch, a cable overhauling device adapted to maintain the cable unwound by said winch taut, said overhauling device comprising a pair of sheaves through which the cable extends, means operable on one of said sheaves for urging the same into frictional engagement with said cable, means for simultaneously operating said sheaves to pay out cable, said last mentioned means including an electric motor, gearing disposed between said sheaves and said motor, clutch means for disconnecting said sheaves from said motor, means including a solenoid for engaging said clutch, resilient means for disengaging said clutch upon deenergization of said solenoid, a normally closed switch for controlling the operation of the said motor and solenoid associated with said overhauling device, a starting switch for said motor, means operated by the said control mechanism for said winch for opening said normally closed switch when the said control mechanism has been so adjusted as to cause said winch to Wind in cable, said last mentioned means including `a cam, and lever means operatively connecting said cam and said switch.

4. In a device of the class described, the combination o1" a cable overhauling device, comprising a pair of sheaves through which said cable extends, resilient means for urging one of said sheaves toward the other to establish a frictional connection between said sheaves and cable, a motor, gearing disposed between said motor and said sheaves whereby simultaneous movement is imparted to said sheaves causing the latter to pay out cable, clutch means for connecting 0r disconnecting said motor from said sheaves, electrical means comprising va solenoid for engaging said clutch, resilient means for disengaging said clutch upon deenergization of said solenoid, switch means for controlling the operation of said motor and solenoid, and cam means for actuating said switch to open and closed position.

RBERT C. LAMOND.