US2071499A - Locking device for crane hooks - Google Patents

Description

Feb. 23, 1937. K. CLODFELTER LOCKING DEVICE FOR CRANE nooxs Filed April 11, 1936 IIIIII II .I

UNITED STATES FATE OFFICE LOCKING DEVICE FOR CRANE HOOKS Karl Clodfeltcr, Blue Island, 111.

Application April 11, 1936, Serial No. 73,927

4 Claims.

My invention relates to the art of handling materials by a crane and particularly to a safety device adapted to look a crane hook against rotation when used for supporting a lifting magnet.

A magnet is used for handling materials of a certain type, the magnet being attached by a ring to the crane hook. There is, however, a

tendency for the magnet and its load to rotate while the load is being transported and such rotation will frequently be continued to such an extent that the conducting wires will be twisted off,

thus de-energizing the magnet and dropping the load. This is a matter of considerable danger and, of course, could be avoided by constructing the crane hook and block in such manner that rotation would not be permitte d. This, however,

would render the apparatus useless for other purposes for which the crane is used in which rotation is desirable.

The device of my invention is intended to adapt the hook for both uses, the hook being locked when a magnet is supported thereon and free to rotate in other uses.

The invention will be more readily understood by reference to my accompanying drawing; in

Which,

Fig. 1 is an elevation of a crane hook and block with a lifting magnet depending therefrom.

Fig. 2 is a plan view of the block and hook with my improvement applied thereto;

Fig. 3 is an end view thereof;

and,

Fig. 4 is a side elevation partly in section. In Fig. 1 a conventional construction is shown including plates l2, a hook block 15 and connecting cable has a portion l3, hook wire ropes lil, sheaves ll, supporting l4, lifting magnet [6. The hook shank I4 I! of reduced diameter at its upper end projecting through the hook block l3 and terminating in a threaded portion carrying a hexagon nut A Washer I80, may be interpose l8 which is pinned to the shank.

d between the nut and the hook block. This construction permits the hook to rotate freely in the block. My construction includes a plate IS in the form of a saddle, the plate having side flanges 29, shown in the instance as separately formed and joined to the plate by rivets, 2|, the flan the contour of the hook block the saddle closely thereon.

pieces 23 at the two ends of the ges conforming to and serving to fit Bolts 22 and crossstructure serve to ders the opening. Seated in disc 25, having a marginal flan the opening is a ge 26, that underlies flange 24, of the plate. A second disc 21, overlies the plate and is secured to the first disc by rivets 28. Both discs are provided with a hexagonal opening nicely fitting the nut l8. Both the flanges of the discs and the plate are provided with a plurality of registering apertures 29, located at different angular points, as shown, and when it is desired to use the crane hook in connection with a lifting magnet one or more pins 30 are inserted in the openings as shown in Fig. 4, thus securely locking the hook and block against relative rotation. The pins may be carried on a chain, not shown, in order to be readily available for use when needed.

It will be seen that with my device in place, the crane may be operated in its usual manner and the hook permitted to rotate freely. When, however, a magnet is to be supported one or more of the pins is slipped into place, thereby locking the parts against relative rotation. The device is so constructed that it may be quickly and easily applied to existing crane blocks with very short interruption of operations.

I claim:

1. The combination with a hook block, of a saddle fitted thereover and clamped thereto, a disc having an annular flange underlying a portion of said saddle, said disc having a noncircular axial opening, a hook shank having a head portion fixed thereon and shaped to fit said axial opening, said saddle and flange having registering openings, and a pin adapted to enter said openings toprevent relative rotation between said hook and block.

2. In combination, a hook block and a hook shank projecting through the block and a nut fixed on the shank, a saddle overlying said block and clamped thereto, said saddle having a central opening, a disc in said opening with its periphery underlying a portion of said saddle, said disc having a central opening shaped to receive the hook nut, said disc and saddle having registering openings, and a pin adapted to enter said openings and when in place to prevent relative rotation between hook and block.

3. In combination, a hook block and a ,hook shank projecting through the block and a nut fixed on the shank, a saddle overlying said block and clamped thereto, said saddle having a central opening, a disc in said opening with its periphery underlying an integral flange that borders said central opening in the saddle, said disc having a central opening shaped to receive the hook nut, said disc and saddle having registering openings, and a pin adapted to enter said opening a non-round aperture fitting the hook fastening element, said disc underlying a portion of the I plate with capacity for rotation, said plate and disc having registering openings, and a pin adapted to enter said openings to prevent relative rotation between hook and block.

KARL CLODFEL'IER.

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