Lock box

Details Lock box Lock box

1997-04-07

1998-08-25

Kramer, Dean

Handling: hand and hoist-line implements

Grapple

Pivoted jaws

294112, B66C 304

Patent

active

057976392

ABSTRACT:
A lock box (10) connected to a lifting device (12) having a plurality of claw-like appendages (14) radially thereabout that is suspended on the ends of chains (16) of a chain lift (18) extending from a crane (20). The lock box (10) is for shortening and lengthening the chains (16) of the chain lift (18) as needed to maintain balance and tension, by locking into place and then unlocking in a cycle during the lifting and releasing process of the claw-like appendages (14) of the lifting device (12) with a large object (22).

REFERENCES:
patent: 262330 (1882-08-01), Stone
patent: 768253 (1904-08-01), Watson
patent: 2776164 (1957-01-01), Eckstein
patent: 2847245 (1958-08-01), Leslie
patent: 3709550 (1973-01-01), Mitchell
patent: 4253695 (1981-03-01), Blaive et al.
patent: 4637643 (1987-01-01), Johnson et al.

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