Title:
Electric traveling hoist
United States Patent 2353437


Abstract:
The present invention relates generally to hoists. More particularly the invention relates to that type of hoist which is known as an electric traveling hoist, serves as a medium for raising, lowering and transporting loads, and comprises a wheel equipped carriage which is adapted to travel...



Inventors:
Bock, George E.
Application Number:
US47333343A
Publication Date:
07/11/1944
Filing Date:
01/23/1943
Assignee:
WHITING CORP
Primary Class:
Other Classes:
254/328, 254/362, 310/66, 475/156, 475/295
International Classes:
B66C7/00
View Patent Images:



Description:

The present invention relates generally to hoists. More particularly the invention relates to that type of hoist which is known as an electric traveling hoist, serves as a medium for raising, lowering and transporting loads, and comprises a wheel equipped carriage which is adapted to travel along an overhead track and has mounted thereon a reversible electric motor, a cable actuating hoisting drum, gearing for driving the drum from the motor and additional motor driven gearing for propelling the carriage.

One object of the invention is to provide a hoist of this type which is an improvement upon, and has certain advantages over, previously designed hoists of like general character and is characterized by lightness in weight and compactness.

Another object of the invention is to provide an electric traveling hoist of the type under consideration in which the gearing for driving the cable actuating hoisting drum and the gearing for propelling the carriage along the track are of novel design and are selectively controlled by way of brakes which are normally set and have solenoids associated with them for releasing purposes.

Another object of the invention is to provide an electric traveling hoist of the last mentioned character in which the reversible electric motor is rotatably mounted and the gearing for driving the drum is directly driven from the armature shaft of the motor and the gearing for propelling the carriage along the track includes gears which are connected for direct drive by the casing of the motor.

A further object of the invention is to provide a hoist of the last mentioned character which includes manually operable means for selectively releasing the normally set brakes and means for manually driving the drum driving gearing and the carriage propelling gearing to the end that the hoist may be manually operated in the event of failure of electric power for the reversible motor.

A still further object of the invention is to provide an electric traveling hoist which is generally of new and improved construction and involves a novel arrangement of parts.

Other objects of the invention and the various advantages and characteristics of the present hoist will be apparent from a consideration of the following detailed description.

The invention consists in the several novel features which are hereinafter set forth and are more particularly defined by claims at the conclusion hereof.

In the drawings which accompany and form a part of this specification or disclosure and in which like numerals of reference denote corresponding parts throughout the several views: Figure 1 is an end view of an electric traveling hoist embodying the invention; Figure 2 is a side view; Figure 3 is an enlarged longitudinal section taken on the line 3-3 of Figure 1 and illustrating in detail the construction and arrangement of the gearing for driving the cable actuating hoisting drum from the motor and the gearing for propelling the carriage along the overhead track; Figure 4 is a section taken on the line 4-4 of Figure 3; and Figure 5 is a section on the line 5-5 of Figure 3.

The electric traveling hoist which is shown in the drawings constitutes the preferred form or embodiment of the invention. It serves as a medium for raising, lowering and transporting loads and is adapted to travel along an overhead track 6. The track is supported from above by .i way of a series of laterally spaced, vertically extending hanger posts 7 and comprises a vertically extending web 8 and a pair of oppositely extending side flanges 9 along the bottom margin of the web. The lower ends of the hanger posts 7 are welded or otherwise fixedly secured to the upper margin of the track web 8. The side flanges 9 are equal in width and extend at right angles to the web 8. The hoist is in the form of a self-contained unit and comprises an elongated carriage 10, a reversible compound wound electric motor II and a pair of coaxial hoisting drums 12.

The carriage 10 comprises a housing 13 beneath the track 6. a pair of supporting wheels 14 and a second pair of supporting wheels IS. The housing is in the form of a one-piece casting and consists of a top wall IS, a pair of end walls 17 and 18, a pair of side walls 19, a bottom wall 28, and a transverse partition 21. The partition extends vertically and is disposed substantially midway between the end walls 17 and 18. It defines with the end wall 17 a motor chamber 22. In addition it defines with the end wall 18 a, chamber 23. The wheels 14 and 15 serve to support the housing in a depending manner from the overhead track 6. As hereinafter described, they are adapted to be driven by the electric motor II in order to propel the carriage in either direction along the track. The wheels 14 are located over the portion of the housing top wall IS that overlies the chamber 22 and are arranged in coaxial relation. They have treads 14a of rubber or other material having a high coefficient of friction and are provided with outwardly extending, fixed stub axles 24. The latter are journalled in anti-friction bearings 25 at the upper ends of a pair of upstanding ears 2G.

The lower ends of these ears are connected to, and formed integrally with, the portion of the housing wall 16 that overlies the chamber 22.

The wheels 14 ride on the side flanges 9 of the track 6 and are positioned in straddle relation with the track web 8. The wheels 15 are arranged in coaxial relation and are positioned over the portion of the housing top wall 16 that overlies the chamber 23. They have treads 15a of the same material as the treads 14a for the wheels 14 and embody fixed, horizontal, outwardly extending stub axles 27. The latter are journalled in anti-friction bearings 28 on the upper ends of a-pair of upstanding ears 29. The wheels 15 ride on the side flanges 9 of the track 6 and, like the wheels 14, straddle the web 8.

By reason of the fact that four wheels are employed the carriage is held against longitudinal tilting relatively to the track.

The electric motor 1 is mounted in the lower portion of the chamber 22 and extends lengthwise of the carriage housing 13. It serves, as hereinafter described, to drive the cable actuating hoisting drums 12 and also to drive the wheels 14 and 15 for carriage propelling purposes. As shown in Figure 3, the motor II consists of a casing and an armature 30. The casing consists of a cylindrical side wall 31, an outer end wall 32, and an inner end wall 33 and is rotatably supported, as described hereafter. The outer end wall 32 of the motor casing is aligned with a circular opening 34 in the lower portion of the end wall 17 of the carriage housing 13 and is provided on the central portion thereof with a fixed, outwardly extending shaft 35. The inner end of the shaft is journalled in an anti-friction bearing 36 in the central portion of a circular plate 37. The latter serves as a closure for the opening 34 and is removably secured in place by way of cap screws 38. The outer end of the shaft 35 projects outwards of the closure plate 37 and is disposed in a gear housing 39 which is removably secured to said plate. The armature 30 of the electric motor II comprises a shaft 40 and this is centrally disposed with respect to the motor casing. One end of the armature shaft is journalled in a bearing 41 on the central portion of the outer end wall 32 of the motor casing and the other end of such shaft is journalled in a bearing 42 on the central portion of the inner end wall 33 and projects beyond the last mentioned end wall into the inner lower portion of the chamber 22. Current is supplied to the motor I by way of slip rings 43 which are spaced apart, are suitably insulated, and surround the outer portion of the side wall 13 of the motor casing. Brushes (not shown) are in sliding contact with the slip rings and constitute the connections between such rings and current supply conductors (not shown). By employing slip rings to supply current to the motor II the motor casing is capable of rotating without interference with the supply of current to the field and shunt windings, and the commutator on the armature 30.

The hoisting drums 12 are disposed at opposite sides of the carriage housing 13 and are positioned in coaxial relation and outwards of the chamber 23. They have associated therewith a cable 44 and are keyed or otherwise fixedly secured to the ends of the shaft 45. The central portion of this shaft is journaled in a pair of anti-friction bearings 46 which are carried by a pair of cover plates 47. The latter are removably connected to the portions of the housing side walls 19 that are at the sides of the chamber 23 and serve when in their normal or operative position to close circular openings 48 in such portions of the housing side walls. The ears 29 are connected to the upper portions of the cover plates 47 (see Figure 4). The cable 44 serves to support a hook equipped load carrying block 49 and has the ends thereof wound around the drums 12. The end extremities of the cable are suitably anchored to the outer ends of the drums.

When the drums are rotated in one direction the cable ends are wound around the drums with the result that the load carrying block 49 is caused to be raised. Reverse rotation of the drums results in unwinding of the cable and lowering of the block. The block embodies a pair of horizontally aligned sheaves 50 around which the central portion of the cable is reeved. The cable ends are applied to the drums, as shown in Figure 2, with the result that the load carrying block 49 is substantially centrally positioned with respect to the carriage.

In addition to the aforementioned parts the hoist comprises gearing for driving the cable actuating hoisting drums 12 from the electric motor 1I, additional gearing for driving the wheels 14 and 15 for hoist propelling purposes, and a pair of brakes 51 and 52 for selectively rendering the two gearings operative or effective.

The gearing for driving the drum 12 from the electric motor II consists of a sun pinion 53, planetary gears 54, a ring gear 55, a worm 56 and a worm wheel 57. The sun pinion 53 is mounted on the end of the armature shaft that projects into the lower inner portion of the chamber 22.

It meshes with, and serves to drive, the planetary gears 54 in response to drive of the motor armature 30. The planetary gears are preferably three in number and surround the sun pinion 53. They are rotatably mounted on stub axles 58 which are fixed to, and carried by, a spider 5f. The latter is fixedly connected to the inner end wall 33 of the motor housing by way of cap screws 60. The ring gear 55 surrounds, meshes with, and is driven by, the planetary gears 54 and is mounted within the side wall of the cup-shaped driving member 61. The cross wall of this driving member is disposed adjacent the lower end of the verticall, g5 extending partition 21 of the carriage housing 13 and embodies at the central portion thereof, an integral shaft 62. The latter projects away from the electric motor II and extends throuwh an opening 63 in the bottom of said partition 21 into the lower portion of the chamber 23. The nortion of the shaft 62 that is disnosed in the chamber 23 is journalled in a pair of suitably retained, axially spaced anti-friction bearings 6S. The worm 56 is keyed or otherwise fixed to the central portion of the shaft 62 and is located between the bearings 64. It meshes with, and serves to drive the worm gear 57. The latter is located in the chamber 23 between the cover plates 4V inl is fixedly secured to the central portion of the shaft 45. The brake 51 surrounds, and is applied to the side wall of the cup-shaped driving member 61 and the other brake, i. e., the brake 52, surrounds, and is applied to the inner portion of, the cylindrical side wall 32 of the motor casing. When the brake 51 is released while the brake 52 is set and current is applied to the electric motor i I the armature shaft 40 revolves and serves to drive the drums 12 through the medium of the sun pinion 53, the planetary gears 54, the ring gear 55, the cup-shaped driving member Gl, the shaft 62, the worm 56 and the worm gear 57. Drive of the armature shaft in one direction results in drive of the drums in one direction and reverse drive of the armature shaft in connection with reverse drive of the electric motor I I results in rceverse drive of the hoisting drums 12. When the brake 51 is released while the brake 52 is set in connection with drive of the drums 12 by the armature shaft 40 and the aforementioned gearing the spider 59 remains stationary and hence the planetary gears 54 in connection with drive thereof by the sun pinion 53 effect drive of the ring gear 5'.

The gearing for driving the wheels 14 and 15 for carriage propelling purposes comprises a worm 65, a worm gear 66 and a pair of chain and sprocket connections 67. The worm and worm gear are disposed in the gear housing 39 on the closure plate 37. The worm 65 is keyed or otherwise fixedly secured to the central portion of the shaft 35 and meshes with, and serves to drive, the worm gear 66 when the easing of the motor II is driven, as hereinafter described.

The worm gear 66 is disposed above the worm l5 and is fixedly secured to a transversely extending shaft 68. The latter is positioned at right angles to the shaft 35 and is journalled in bearings on the sides of the gear housing 39. The ends of the shaft 68 project outwards of said gearing housing sides. The chain and sprocket connections 67 comprise a pair of endless chains 69, a pair of sprocket wheels 70 on the ends of the shaft 68, a pair of sprocket wheels 71 on the outer ends of the stub axles 24, a pair of sprocket wheels 72 on the outer ends of the stub axles 27, and a pair of idler sprocket wheels 73. The idler sprocket wheels are disposed upwards and inwards of the sprocket wheels 7C and are mounted on a shaft 74 which extends through the side walls 19 of the carriage housing 13. The chains 69 extend around the sprocket wheels 70 on the ends of the worm gear shaft 68, then extend upwards and inwards to the sprocket wheels 7 on the sub axles for the wheels 14. then pass over the sprocket wheels 71, then extend horizontally to the sprocket wheels 12 on the stub axles 27 for the wheels 15, then exteid around the sprocket wheels 72, then extend diagonally downwards to the idler sprocket wheels 73 and around the latter. When the brake 52 is released while the brake 51 is set and current is supplied to the electric motor if the armature is caused to revolve and operates through the medium of the sun pinion 53 and the planetary gears 54, to rotate the spider 59 and the motor casing. Ro-tation of the motor casing causes the gearing in the form of the worm 65, the worm gear 66 and the chain and sprocket connections 67 to drive the wheels 14 and 15 and effect propulsion of the carriage 10 along the track 6. Rotation of the armature 30 in one direction effects travel of the carriage in one direction along the track P and reverse rotation of the motor armature effects travel of the carriage in the opposite direction along the track 6. The spider and motor casing are caused to rotate when current is supplied to the motor II while the brake 52 is released and the brake 51 is set by reason of the fact that when the ring gear 55 is stationary the sun pinion 53, in connection with drive or rotation of the motor armature 30, drives the planetary gears 54 around the ring gear.

The brake 51, for locking against rotation the ring gear 55, comprises a pair of arcuate brake shoes 75. These are disposed in the lower inner portion of the chamber 22 and fit against opposite sides of the side wall of the cup-shaped driving member 6 . The lower ends of the shoes are provided with depending lugs 76 that are cross connected by way of an adjusting bolt 77 which extends through coaxial holes 78 in the lugs 76.

The lugs project through an opening 79 in the bottom wall 20 of the carriage housing 13 in order that the adjusting bolt is disposed exteriorly of the housing and hence is readily accessible for brake adjusting purposes. The upper ends of the brake shoes 75 are provided with opposed lugs 80 and these are cross connected by way of a pair of links 81. The outer ends of the links are pivotally connected to the lugs 80 by way of pins 82 and the inner ends of the links are pivotally connected together by way of a pin 83. The links extend inwards and downwards, as shown in Figure 5. When the pin 83 is urged downwards the links 81 operate to contract the brake shoes 75 and thus set the brake 51 and effect locking of the hoisting drums 12. When the pin 83 is raised the links move outwards and urge apart the brake shoes 75, thus releasing the brake 51 and permitting the drums 12 to be driven by the electric motor II. The brake 51 is normally maintained in its set position. It is released by a solenoid 84 which is disposed in the upper inner portion of the chamber 22 directly over the cupshaped driving member 61 and comprises a stationary helix or coil 85 and a vertically slidable armature 86. The lower end of the armature is connected to the pin 83. When the solenoid is energized the armature is retracted upwards and thus effects release of the brake 51. A compression spring 87 surrounds the central portion of the armature and serves, when the solenoid is deenergized, to shift the armature downwards for brake setting purposes. The upper end of this spring abuts against the bottom portion of the container for the helix or coil 85 and the lower end of the spring abuts against a collar 88 on the armature. As the result of the action of the spring 87 the brake is normally maintained set.

When the solenoid 85 is energized the brake 51 is released, as hereinbefore pointed out. The brake 52 is similar in design and construction to the brake 51. It comprises a pair of brake shoes 89 and these are positioned on opposite sides of the Sinner portion of the cylindrical side wall 31 of the motor casing. The lower ends of the brake shoes are cross connected by way of an adjusting screw 90 which is disposed exteriorly of the carriage housing 13. A pair of links 91 like the links 81 of the brake 51, extend between the upper ends of the brake shoes 89. The brake 52 is normally set so as to hold or lock the casing of the electric motor 1I against rotation. It is controlled or released by a solenoid 92 which is disposed in the upper portion of the chamber 22 and consists of a helix or coil 93 and a vertically slidable armature 94. The lower end of the armatue is connected to the pivot pin between the inner ends of the links 91. A compression spring 85 surrounds the central portion of the armature and serves to urge the armature downwards and thus maintain the brake 52 in its set position. When the solenoid 92 is energized the armature 94 is retracted upwards and thus releases the brake 52 so as to free the motor casing in connection with drive of the wheels 14 and 15 for carriage propelling purposes. When it is desired to drive the cable actuating hoisting drums 12 the solenoid 84 is energized and at the same time current is supplied to the electric motor 11. As soon as the solenoid is energized the brake 51 is released and the armature 30 of the motor operates, as hereinbefore described, to drive the drums. By energizing the solenoid 84 the drums 12 may be driven in one direction or the opposite direction by driving the armature of the reversible electric motor II either in one direction or the other. When it is desired to propel the carriage in connection with transfer or transportation of a load on the hook equipped block 49 the solenoid 92 is energized so as to release the brake 52. As soon as this brake is released and current is supplied to the motor If the motor casing is caused to rotate and operates through the medium of the gearing heretofore described, to drive the wheels 14 and 15. When the motor I is driven in one direction while the solenoid 92 is energized the carriage 10 will travel in one direction along the overhead track 6.

Reverse drive of the electric motor 11 while the solenoid 92 is energized and the brake 52 thus released results in travel of the carriage in the opposite direction along the overhead track 6.

As shown in Figure 3, the outer end of the shaft 62 projects through an opening 96 in the lower end of the end wall 18 of the carriage housing 13 and embodies a polygonal head 97.

The latter is adapted to fit in a polygonal socket 9o in one end of a crank 99. When it is desired manually to rotate the drums 12 for load hoisting or lowering purposes the crank 99 is em-rloyed. A band lever 100 permits the brake 51 to be manually released in connection with manual drive of the drums 12 by the crank 99.

This lever (see Figure 5) extends through an opening 101 in one of the side walls 19 of the carriage housing 13. The central portion of the lever is pivotally supported by way of a pin J02 on lugs adjacent the opening defining portion of said one housing side wall. This pin extends horizontally and permits the lever to swing in a vertical plane. The inner end of the lever is connected to the lower end of the armature 88 of the solenoid 84 by way of a pin and slot connection 103. The outer end-of the lever is in the form of a handle whereby the lever may be gripped. When the handle is swung downwards the lever operates to release the brake 51 and thus permits manual drive of the hoisting drums 12 by the crank 99. The crank is used ordinarily when there is a stopoage in the current supply for the electric motor I . A cap 104 is removably secured to the lower end of the housing end 18 and serves to cover the polygonal head 97 when the crank 99 is not in use.

The outer end of the shaft 35 projects through an opening 105 in the gear housing 39 and embodies a. polygonal head 106. This head is adapted to fit within a polygonal socket 107 in the central portion of the crank 99 when it is desired to use the crank in connection with manual propulsion of the carriage 10. For the purpose of releasing the brake 52 when it is desired to use the crank on the shaft 35, a hand lever 108 is provided. This lever is like, and is arranged in side by side relation with, the hand lever 10 for manually controlling the brake 51.

It extends through an opening 109 and has the inner end thereof connected to the armature 94 of the solenoid 92 by way of a pin and slot connection. The outer end of the lever 108 is in the form of a handle. When this handle is swung downwards the armature 94 is raised against the force of the compression spring 95 and release of the brake 52 is thus effected.

When the brake 52 is released the shaft 35 may be turned by the crank 99 in connection with manual propulsion of the carriage 10. The lever 108 and the crank 99 are ordinarily employed manually to propel the carriage when the supply of current to the electric motor stops.

The herein described electric traveling hoist is both compact and extremely light in weight and has special utility in the handling of bombs or other cargo in an airplane or other vehicle. By reason of the fact that the hoist includes means for manually releasing the brakes and also means for manually driving the hoisting drums and means for propelling the carriage the hoist may be operated by hand in the event of failure of current supply. Inasmuch as the cable actuated hoisting drums 12 are perpendicular or normal to the overhead track 9 the cable 44 spools properly so far as the dr-ms are concerned, regardless of whether the track is level or inclined.

The invention is not to be understoodc as restricted to the details set forth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention what I claim as new and desire to secure by Letters Patent is: 1. A hoist designed for use in connection with a track and comprising a carriage adapted for travel along the track, a rotatable ho'sting element on the carriage, a rotatable element on the carriage for propelling said carriage along the track, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the elements, gearing for driving the other element from the armature of the motor, a brake for controlling drive of said one element, and a second brake for controlling drive of said other element.

2. A hoist designed for use in connection with an overhead track and comprising a carriage adapted for travel along the track, a rotatable hoisting element on the carriage, a rotatable element on the carriage for propelling said carriage along the track, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the elements, gearing for driving the other element from the armature of the motor, a brake for controlling drive of said one element, a second brake for controlling drive of said other element. and a pair of solenoids associated respectively with, and adapted to actuate the brakes.

3. A hoist designed for use in connection with a track and comprising a carriage adapted for travel along the track, a rotatable hoisting element on the carriage, a rotatable element on the carriage for propelling said carriage along the track, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the elements, gearing for driving the other element from the arma, ture of the motor, a normally set brake for preventing drive of said one element, a second normally set brake for preventing drive of said other element, and means whereby the brakes may be selectively released.

4. A hoist designed for use in connection with an overhead track and comprising a carriage adapted for travel along the track, a rotatable hoisting element on the carriage, a rotatable element on the carriage for propelling said carriage along the track, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the elements, gearing for driving the other element from the armature of the motor, a normally set brake for preventing drive of said one element, a second normally set brake for preventing drive of said other element, and a pair of solenoids associated respectively with, and adapted to release, the brakes. 5. A hoist designed for use in connection with an overhead track and comprising a carriage adapted for travel along the track, a rotatable hoisting element on the carriage, a rotatable element on the carriage for propelling said carriage along the track, an electric motor rotatabiy mounted on the carriage and having the casing thereof connected to drive one of the elements, gearing for driving the other element from the armature of the motor, a normally set brake for preventing drive of said one element, a second normally set brake for preventing drive of said other element, a pair of solenoids associated respectively with, and adapted to release, the brakes, and hand levers associated respectively with, and adapted to release, the brakes.

6. A hoist adapted to travel along an overhead track and comprising a carriage having track engaging wheels, a rotatable hoisting drum on the carriage, an electric motor rotatably mounted on ;15 the carriage and having the casing thereof connected to drive one of the wheels, gearing for driving the drum from the armature of the motor, a brake for controlling drive of said one wheel by the motor casing, and a second brake for controlling drive of the drum by the armature.

7. A hoist adapted to travel along an overhead track and comprising a carriage having track engaging wheels, a hoisting drum rotatably mounted on the carriage, an electric motor ro- tatably mounted on the carriage and having the casing thereof connected to drive one of .the wheels, gearing for driving the drum from the armature of the motor, a normally set brake for preventing drive of said one wheel by the motor casing, a second normally set brake for preventing drive of the drum by the armature shaft, and means whereby the brakes may be selectively released.

8. A hoist adapted to travel along an overhead 5 track and comprising a carriage having track engaging wheels, a hoisting drum rotatably mounted on the carriage, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the wheels, gearing for driving the drum from the armature of the motor, a normally set brake for preventing drive of said one wheel by the motor casing, a second normally set brake for preventing drive of the drum by the armature shaft, and a pair of solenoids associated respectively with, and adapted when energized to release, the brakes.

9. A hoist adapted to travel along an overhead track and comprising a carriage having track engaging wheels, a hoisting drum rotatably mounted on the carriage, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the wheels, gearing for driving the drum from the armature of the motor, a normally set brake applied to the motor casing and adapted to prevent rotation thereof, a second normally set brake for preventing drive of the drum by the motor armature, and means for selectively releasing the brakes.

10. A hoist adapted to travel along an overhead track and comprising a carriage having track engaging wheels, a hoisting drum rotatably mounted on the carriage, an electric motor rotatably mounted on said carriage and having the casing thereof connected to drive one of the wheels, gearing for driving the drum from the armature of the motor, a normally set brake applied to, and adapted to prevent rotation of, the motor casing, a normally set brake for preventing drive of the drum, and a pair of solenoids associated respectively with, and adapted when energized to release, the brakes.

11. A hoist adapted to travel along an overhead track and comprising a carriage having track engaging wheels, a hoisting drum rotatably mounted on the carriage, an electric motor rotatably mounted on said carriage and having the casing thereof connected to drive one of the wheels, gearing for driving the drum from the armature of the motor, a normally set brake applied to, and adapted to prevent rotation of, the motor casing, a normally set brake for preventing drive of the drum, a pair of solenoids associated respectively with, and adapted when energized to release, the brakes, and a pair of hand levers on the carriage for manually releasing the brakes.

12. A hoist designed for use in connection with an overhead track and comprising a carriage adapted for travel along the track, a rotatable hoisting element on the carriage, a rotatable element on the carriage for propelling said carriage along the track, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the elements, gearing for driving the other element from the armature of the motor, including a sun pinion on the shaft of the motor armature, planetary gears positioned around, and in mesh with, the pinion and having a cage therefor connected to the motor casing, and a ring gear around, and in mesh with, the planetary gears, a brake for controlling drive of said one element by the casing, and a second brake applied to said ring gear and adapted to control drive of said second element by the motor armature.

13. A hoist designed for use in connection with an overhead track and comprising a carriage adapted for travel along the track, a rotatable hoisting element on the carriage, a rotatable element on the carriage for propelling said carriage along the track, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the elements, gearing for driving the other element from the armature of the motor, including a sun pinion on the shaft of the motor armature, planetary gears positioned around, and in mesh with, the pinion, and having a cage therefor connected to the motor casing, and a ring gear around, and in mesh with, the planetary gears, a brake applied to the motor casing and adapted to control drive of said one element by the casing, and a brake applied to said ring gear and adapted to control drive of said other element by the armature.

14. A hoist adapted to travel along an overhead track and comprising a carriage having track engaging wheels, a hoisting drum rotatably mounted on the carriage, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the wheels, gearing for driving the drum from the armature of the motor, including a sun pinion on the shaft of the motor armature, planetary gears positioned around, and in mesh with, the pinion and having a cage therefor connected to the motor casing, and a ring gear around, and in mesh with, the planetary gears, a brake applied to the motor casing and adapted to control drive of said one wheel by the casing, and a brake applied to the ring gear and adapted to control drive of the drum by the armature.

15. A hoist adapted to travel along an overhead track and comprising a carriage having track engaging wheels, a hoisting drum rotatably mounted on the carriage, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the wheels, gearing for driving the drum from the armature of the motor, including a sun pinion on the shaft of the motor armature, planetary gears positioned around, and in mesh with, the pinion and having a cage therefor connected to the motor casing, and a ring gear around, and in mesh with, the planetary gears, a normally set brake applied to the motor casing, a normally set brake applied to the ring gear, and means for selectively releasing the two brakes.

16. A hoist adapted to travel along an overhead track and comprising a carriage having track engaging wheels, a hoisting drum rotatably mounted on the carriage, an electric motor rotatably mounted on the carriage and having the casing thereof connected to drive one of the wheels, gearing for driving the drum from the armature of the motor, including a sun pinion on the shaft of the motor armature, planetary gears positioned around, and in mesh with, the pinion and having a cage therefor connected to the motor casing, and a ring gear around, and in mesh with, the planetary gears, a normally set brake applied to the motor casing, a normally set brake applied to the ring gear, and means for selectively releasing the brakes embodying a pair of solenoids associated with the brakes respectively.

17. A hoist adapted for use in connection with an overhead track and comprising an elongated carriage disposed beneath the track and in the form of a substantially closed housing having laterally spaced complemental sides spaced equidistantly from the transverse center of the track, and also having track engaging wheels at the top thereof whereby it is supported for lengthwise travel along the track, a pair of separate rotatable coaxial hoisting drums positioned outwards of the sides of the housing, a single electric motor mounted in the housing in centered relation with said sides, gear mechanism for driving the drums from the motor, gear mechanism for driving one of the wheels from said motor, and means for selectively effecting drive of the gear mechanisms by said motor.

18. A hoist designed for use in connection with an overhead track and comprising a carriage in the form of a housing elongated lengthwise of the track and having track engaging wheels at the top thereof whereby it is supported for travel along the track, a pair of independent coaxial rotatable hoisting drums positioned at opposite sides of the housing and also wholly exteriorly of the latter, a single reversible electric motor mounted in, and extending longitudinally of, the housing, gear mechanism for driving the drums from the motor, gear mechanism adapted to be driven by said motor and to propel the carriage along the track, and means for selectively effecting drive of the gear mechanisms by said motor.

19. A hoist designed for use in connection with an overhead track and comprising a carriage in the form of an elongated housing having track engaging wheels at the top thereof whereby it is supported for lengthwise travel along the track, a hoisting drum rotatably supported on, and positioned externally of, the housing, a reversible electric motor mounted rotatably in the housing and having the casing thereof connected to drive one of the wheels for carriage propelling purposes, gearing for driving the drum from the armature of the motor, including a sun pinion on the armature shaft, planetary gears positioned around, and in mesh with, the sun pinion and having a spider therefor secured to the motor casing, and a ring gear around, and in mesh with, said planetary gears, a brake applied to the motor casing and adapted to control drive of said one wheel by said casing, and a brake applied to the ring gear and adapted to control drive of the drum by the armature.

GEORGE E. BOCK.