US2243358A

US2243358A - Hoisting device

Info

Publication number: US2243358A
Application number: US269948A
Authority: US
Inventors: Erford E Robins
Original assignee: Columbus McKinnon Chain Corp
Current assignee: Columbus McKinnon Chain Corp
Priority date: 1939-04-25
Filing date: 1939-04-25
Publication date: 1941-05-27
Anticipated expiration: 1958-05-27

Description

May 27,- 1941.

E. ET RoBlNs HQISTING DEVICEv 2` Sheets-Sheet 2 Filed April 25, 1939 ing .parts 4l l. and2t.

Patented May 27, 194i fr" i? i' HOIS'IING DEVICE Application April 25, 1939, Serial N0. 269,948

4 Claims.

My invention relates in general to hoisting devices `and more particularly to a chain hoist of .the electrically operated type.

The princi-pal object of my invention has been lto provide -a hoist having all of its operating :and

Ycontrol lever parts enclosed within the casing or protected by the exterior contour of the casing Y parts, thereby reducing the clearance dimensions of the hoist to a minimum.

Another object has been to provide an efficient, compact hoist having certain groups of its shafts in coaxial or telescoped arrangement.

Moreover, it has been a specic object to have the control shaft in telescopic or coaxial arrangement with the intermediate gear shaft of the hoist.

The above objects and advantages have 'been accomplished by the device shown in the accompanying drawings, of which:

Fig. 1 is an exterior View of an electric hoist, partly in section.

Fig. 2 is an enlarged plan View of the same, partly in section, and taken on line 2 2 of Fig. 1.

Fig. 3 is a transverse, sectional elevation of my device `and is taken on line 3 3 of Fig. 2.

Fig. 4 is an end elevation of my hoist with the casing cover removed.

My hoist comprises a motor i5 secured to one end of a main casing part i i and provided with a suitable controller switch i2. The hoist is Drovided with the -usual hoist hook i3, load chain I4, swivel block l5 and load 'hook i6. At the forward end of the main casing part l! is an intermediate casing part 2t and secured to this casing part is the casing cover 2l for enclosing substantlally all of the hoist operating parts.

The load Wheel 22 of my device is preferably made integrally with `a load shaft 23 which is suitably mounted in anti-friction bearings 2 carriedby the casing part l l. The anti-friction bearings are of such size as to provide openings in the main casing part suiiicient to permit the passage of the load-lift wheel 22 when assembling or disassembling. This load wheel is arranged immediately in front of the motor i0 and it is tubular in form for the reception of the motor shaft V2t which extends therethrough. The bore through the tubular load-lift shaft is somewhat larger than the diameter of the motor shaft 24 so that the motor shaft does not have any frictional contact with the load-lift shaft. The forward end of the motor shaft is supported by the intermediate casing part 2i) in the anti-friction bearing 29 to be hereinafter described. On the forward end `of theload-lift shaft 23 is rigidly mounted the load gear 25. Arranged at one side of the axis of the `motor shaft 24 is the intermediate gear shaft 31. This shaftis of tubular formation and is supbearings 2t carried by the cas- The intermediate gear 25 is ported by suitable preferably formed integrally with the intermedi- `ate shaft 3l, and 'a load pinion 30 is preferably also integrally 'formed with saidl intermediate shaft. The parts are so arranged that the lload pinion ,meshes with the loadr gear 25 .and the intermediate gear 26 is disposed in front of the load gear 25.

The motor shaft 24 is extended beyond the end Y of the load-lift wheel shaft 23, having such end extending through the casing part 20 and into the casing cover 2l. Rigidly mounted upon the outer end of the motor shaft 24 is a motor pinion 3l which meshes with the intermediate gear 26, the hub of such rgear preferably extending forwardly and being mounted in :a-suitable antifriction bearing 29 carried by the casing part 20. A brake drum 32 is mounted upon the extreme outer end vof the motor shaft.

In order to bring the control parts of my hoist within the casing cover, it is necessary that the parts be nested or telesooped. To this end Lpass the control shaft 33 of my hoist through the hollow intermedi-ate gear shaft 3l. This shaft is mounted in suitable bearings 3ft and 35 carried by and formed in the casing parts I l and 20, respectively. The control shaft is carried lby bearings separate and independent of the bearings 28 which support the intermediate shaft. The bore through the hollow intermediate shaft is considtogether by means of a segmental gear 40, carried by the control shaft 33,-and a segmental gear ill, carried by the control switch shaft 36.

Mounted upon the outer end of the control shaft is the control lever 42 lof my device. This lever may be of the conventional type but. preferably is of the type shown and described in the co--pending `application of Karl W. Stinson, Serial No. 247,375 upon Hoists. Attached to the arms i3 and 44 of the control lever are lcontr-olr cords i5 and d5, respectively, each having an .operating handle 50 at its lower end. The operating shaft 33 is extended forwardly and 4has its extreme outer end 5| disposed in a bearing 52 formed inthe casing cover 2l. Suitable apertures 53 are formed in the lower part of the casing cover for the passage of the control cords 45 and 5. Suitable means may be `provided -f-or keepingthe control shaft 33 in neutral position, land forthis purpose I have shown a centralizing spring 5B which is mounted upon the hub 55 of the control lever. The upwardly extending arms pin .Gli carried by the hub 55 of the control lever and they also straddle a stationary -pin 6| carried by a bracket 62.

Mounted between the control lever 42 and the bearing 35 of the control shaft 33 is the brake cam 63 of my device. This cam is rigidly carried by the control shaft and coacts with the

brake arms

64 and 65. These brake arms .are pivotally mounted upon pins 6B carried by the casing part 20. Each of the arms is provided with the customary brake lining 10 which engagesL the brake drum 32.

By extending the motor shaft 24 through the load-lift Wheel shaft 23, the center of gravity is at substantially the same point on the hoist Whether the hoist is loaded or not. Furthermore, lby eX- tending the control shaft 33 through the intermediate gear shaft 31, it is possible to enclose the control lever 42 Within the cover casing 2l, instead of having it exposed on the outside or to one side of the casing as is customary, thereby i making it possible to construct a substantially completely enclosed hoist which is convenient and safe to handle. Moreover, -by having the control shaft extended through the intermediate gear shaft, it is completely enclosed and protected from damage by accident or careless handling of the hoist.

Obviously, some modifications of the details herein shown and described may be made without departing from the spirit of my invention or l the scope of the appended claims, and I do not, therefore, wish to be limited to the `exact embodiment herein shown and described, the form shown being merely preferred embodiment thereof.

Having thus described my invention, what I claim is:

1. A hoist including a housing consisting of a main housing part, an intermediate housing part and a cover, a load-lift shaft mounted in suitable bearings carried by the main housing part, a load-lift wheel carried by said load-shaft, the load-lift shaft bearings being of such siZe as to permit the passage of the load-lift Wheel when assembling the parts, a motor carried by the main housing part and having a driving shaft, said driving shaft -being supported in Ia bearing carried by the intermediate housing part, said driving shaft passing through said load-lift shaft, an intermediate shaft in spaced relation with said driving shaft, suitable reduction gearing connecting said driving shaft to said load-lift shaft, said intermediate shaft being mounted in bearings carried by said main housing part and the intermediate housing part, a control shaft passing through said intermediate shaft and supported by said housing parts independently of the bearings for the intermediate shaft, .brake means carried by said intermediate housing part `and the protruding end of said driving shaft, said brake means being mounted within said intermediate housing part and said cover, brake actuating means carried by said control shaft and mounted Within said cover, a control lever mounted Within said cover and carried by said control shaft, `a

-control switch, and means for connecting said control shaft with said control switch.

2. A hoist including a housing, a load-lift shaft supported by said housing and carrying a load-lift wheel, 'a motor supported at one end of said housing and having a. driving shaft extending into said housing, said driving shaft passing through said load-lift shaft, an intermediate shaft in spaced relation with said driving shaft, suitable reduction gearing connecting said driving shaft to said load-lift shaft, a cover secured to the lii) housing for enclosing the protruding end of said driving shaft, a brake means carri-ed by the protruding end of said driving shaft and the housing and enclosed within said cover, acontrol shaft passing through said intermediate shaft and supported by said housing and said cover, a control arm carried .by said control shaft and mounted within said cover, a brake cam :carried by said control shaft and engageable with said brake means, said control shaft having its end adjacent the motor protruding from said housing at the motor end thereof, .a control switch mounted upon said motor and having its shaft in offset relation with said control shaft, and means connecting the protruding end of said control shaft with the shaft of said switch.

3. A hoist including a housing consisting of a main housing part, a separate intermediate housing part, Iand a separate cover, said intermediate housing part having a lateral wall, a load-lift shaft mounted in suitable bearings carried only by the m-ain housing part, said load-lift shaft being formed with an axial opening therethrough, a motor carried by the main housing part and having a driving shaft, said driving shaft having `an extension projecting beyond said motor through said axial opening, said extension being of less diameter than the opening through said load-lift shaft and being supported independently of said load-lift shaft in a bearing carried only by the lateral wall of said intermediate housing part, an intermediate shaft in spaced relation with said -driving shaft, said intermediate shaft having an axial opening therethrough, suitable reduction gearing connecting said driving vshaft to said load-lift shaft, said intermediate shaft being mounted in bearings carried yby the main housing part and the intermediate housing part, a control shaft @passing through said int-ermediate shaft and having a diameter less than the diameter of the opening in said intermediate shaft, said control shaft being supported by said last mentioned housing parts in bearings arranged adjacent the bearings of the intermediate shaft and independent thereof, brake means carried by said intermediate housing part and the protruding end of said driving shaft, said brake means being mounted Within said intermediate housing part and said cover, brake actuating means carried by said control shaft and mounted within said cover, a control lever mounted within said cover and carri-ed by said control shaft, a control switch, and means for connecting said control shaft With said control switch. n

4. The combination, in a hoist, comprising a housing, va load-lift shaft carrying a load-lift Wheel, a drive Shaft, an intermediate shaft mounted in bearings carried by said housing and having an axial opening therethrough, spur gearing connecting said shafts, of -a control means including a control shaft having a diameter less than th-e diameter of the opening of said intermediate shaft, said control shaft being dis-posed within said intermediate shaft but out of bearing contact therewith, said control shaft being mounted at both ends in bearings carried rby the housing which Iare separate from and independent of the bearings of said intermediate shaft, and a control switch, said control switch having its shaft in offset relation to said control shaft, a control lever carried by said control shaft :and mounted within said housing, and means connecting said control shaft `and said switch shaft.

ERFORD E. ROBINS.