Self-leveling bottom block assembly

Details Self-leveling bottom block assembly Self-leveling bottom block assembly

2011-06-21

2011-06-21

Rodríguez, Saúl J (Department: 3652)

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Cable and hook tackle

C212S274000, C212S326000, C212S327000, C254S280000

Reexamination Certificate

active

07963579

ABSTRACT:
A bottom block assembly includes a block having a central vertical axis, a hook secured to the block for attaching a load to the block, a first pair of sheaves rotatably attached to the block, a first rope reeved about the first pair of sheaves, a second pair of sheaves rotatably attached to the block, and a second rope reeved about the second pair of reeves. The first and second pairs of sheaves are each equally spaced about the central vertical axis. The first pair of sheaves are located higher on the block than the second pair of sheave so that a portion of the first rope located between the first pair of sheaves crosses over a portion of the second rope located between the second pair of sheaves. If either rope fails, the other rope ensures the block remains level with a full load attached to the hook.

REFERENCES:
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patent: 2820624 (1958-01-01), Koegel
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patent: 3936034 (1976-02-01), Larralde
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patent: 4360112 (1982-11-01), Brewer et al.
patent: 4597497 (1986-07-01), Aberegg
patent: 5603420 (1997-02-01), Swanson

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