US2542209A - Load bar for hoists - Google Patents

Description

Feb. 20, 1951 ROBlNs ETAL 2,542,209

LOAD BAR FOR HOI STS Filed Aug. 9, 1947 lNVENTOR [RFORD E. ROE/AIS /'/UMPHRV I: PARKER F/g E. I BY ATTO RNEYS Patented Feb. 20, 1951 LOAD BAR FOR' HOISTS Erford E. Robins, North Tonawanda, and Humphrey F. Parker, Buffalo, N. Y., assignors to Columbus McKinnon Chain Corporation Application August 9, 1947, Serial No. 767,832

Claims. 1

Our invention relates in general to suspended hoists, and more particularly to a load bar for use in connection with such hoists.

It is Well known to those skilled in the art that in present day structures of this type where a load bar is used to increase the capacity of the hoist, such load bar or yoke is usually attached to the hoist casing in the position formerly occupied by the top hook of the hoist, but such arrangement requires the same or a greater amount of head room for the hoist.

The principal object of our invention is to provide a load bar so arranged and attached to the hoist that the head room required for the hoist will be reduced to a minimum.

Another object is to provide a load bar whereby a hoist having a single chain reeving may be conveniently altered to increase its capacity by the use of a lower chain block.

Another object of our invention is to relieve the load bar fastening means of substantially all the tension produced by the hoist load.

A further object is to provide a load bar which may be easily and quickly attached to the hoist to increase its capacity.

Moreover, our invention is sturdy in construction, and when used on a hoist does not require any redesigning of the hoist casing, and does not add materially to the Weight of the hoist or its cost of manufacture.

Furthermore, our device is of such a nature that it may be easily removed from the hoist when desired and the hoist restored to its original reeving.

The above objects and advantages as well as others which will be obvious to those skilled in the art, have been accomplished by the device shown in the accompanying drawings, of which:

Fig. l is a side elevation of a hoist of the puller type equipped with our invention.

Fig. 2 is an enlarged fragmentary sectional view of the device taken on line II-II of Fig. 3; and

Fig. 3 is an enlarged plan view partly in section.

For convenience of illustration, we have shown As above pointed out, our invention is shown in the accompanying drawings as applied to a hoist of the puller type having the customary casing l0 enclosing the hoist mechanism (not shown) which is actuated by the usual reversible ratchet arm ll.

As clearly shown in Fig. 2. the casing II] is provided with a casing abutment l2 which extends across a recess l3 formed in the casing and underlying the abutment; The abutment is provided with an aperture 14, which in the event of a single reeving hoist provides the pivotal mounting for the stud I5 of the top hook Hi.

When a hoist is being manufactured as a double reeving hoist or a single reeving hoist is being changed to increase the capacity thereof, the load bar 20 of our invention is used. This bar is provided with a body portion 2| having an attaching arm 22 at its inner end. This attaching arm extends inwardly into the recess l3 of the casing and it is preferably formed with a screw-threaded opening 23 for the reception of an attaching bolt 24. Because of the fact that our load bar is located below the abutment I 2, and therefore sustains substantially all of the load placed upon it by compression, the bolt 24 is not required to be as large in diameter as the diameter of the stud l5 of the top hook, which sustains all of the load by tension. When a hoist is being manufactured for double reeving and the load bar is standard equipment, the opening [4 through the abutment is made substantially the same size as the bolt. When, however, the hoist .is to be equipped for interchangeability from one reeving to another, or when it is intended that the hoist have its capacity changed subsequent to its manufacture, then the opening I4 is of the proper size to lit the diameter of the hook stud l5. Under the latter conditions, a sleeve or bushing 25 is employed which fits into the opening I4 of the abutment and is provided with an aperture 26 of suitable size for passage of the screw 24. The sleeve is preferably made slightly longer than the length of the opening M in the abutment, whereby the bolt head may be drawn down tightly into the sleeve so that any rotative movement of the load bar will be about the sleeve as a pivot, thereby preventing any tendencyto loosen the bolt.

The body portion 2| of the load bar extends beyond the hoist casing in, and it is provided at its outer end with spaced chain arms 30, which are perforated for the reception of a chain pin 3| whereby the end 32 of the load chain 33 may be attached thereto. The load bar is formed preferably intermediately oi'its ends with an opening having a top hook abutment, comprising a body 34 for the rotatable engagement of the stud l5 block carries the lower load hook 4| of the hoist." When a hoist is to have its capacity increased by the use ofv our invention, the upper hook is're moved from the hoist hook abutment and is placed within the aperture 34 of the load bar where it is rotatably secured by the collar 35 and v the pin 36. The attaching -arm of the bar is then placed within the recess of the casing in such position that its upper surface engages the under surface of the abutment. The bolt 24 is then passed through the opening 34 in the abutment in which has been inserted the bushing 25, and the bar is secured in place by tightenin the bolt 24. The lower hook usually provided on a single reeving hoist is then removed from the end of the load chain and the chain is reeved through'a hook block 40 and its end is placed in the slot of the bifurcated chain arm 30 where it is secured in'place by means of pin 3|.

Obviously, some modifications of the details herein shown and'd escribed may be made without departing from the spirit of our invention or the scope of the appended claims; and we do not, therefore, wish to be limited to the exact de tails herein shown and described. 7

What is claimed is:

1. A load bar for'hoists, comprising a body having an attaching arm and a load chain arm arranged in substantially the same plane, screw means for securing said attaching arm to the casing of said hoist, a top hoist hook having a stud for passage through said body, stop means carried by said stud and abutting the underside of said attaching arm, and means for securing the free end of the hoist load chain to the said chain arm.

2. The combination with a hoist having a top hook abutment formed with a substantially fiat under surface, of a load bar having an attaching arm for disposing below said abutment, means for securing said bar to the under side of said abutment, a chain arm extending from said bar for attachment of the upper end of the hoist load chain, said load bar having its entire length ly ing beneath a plane passing through the underside of said abutment and a top hook secured to said load bar. I

3. A substantially straight load bar for hoists an attaching arm arranged in substantially the.

having an attaching arm formed at one end and arranged in substantially the same plane as the body, said attaching arm being disposed beneath said abutment, means for securing said arm to the under side of said abutment, a chain arm'formed at the oppositeendof said bar, chain fastening means carried by said chain arm for attaching the upper end of the hoist load chain, and a top hook pivotally attached to said bar adjacent said abutment. 4. The combination with a hoist having an abutment formed with an opening for the top "hook,"of Ialo'ad bar having a body and an attaching ar-m disposed in substantially the same plane, said body having spaced chain arms formed opposite to said attaching arm disposed beneath said abutment, a bolt passing through the opening of said abutment and said attaching arm to secure said bar to the under side of said abutment, said chain arms extending outwardly beyond said abutment, means for securing the upper end of the hoist load chain to said chain arms-said bar being formed intermediate-the attaching and chain arms with an opening, and a top hook having a stud for pivotal engagement with said bar opening.

5. The combination with a hoist having an abutmentiormed with an opening for the top hook, of a load bar having a body provided with same plane, said attaching arm being engageable with the under side of said abutment, a bolt passing through the opening of said abutment and said attaching ar-m tolsecure said bar in place, chain armsextending outwardly beyond said abutment, means for securing the upper end of thehoist load chain to said chain arms, said bar being formed intermediate the attaching and'chain'arms with an opening, a top hook having a stud for pivotal attachment with said bar opening, said bolt having a diameter less than the, diameter of said stud, and a bushing for insertion in the top hook opening of the hoist said bushing being slightly longer than the thickness of the attaching arm.

ERFORD E. ROBINS.

HUMPHREY F. PARKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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