Anti-two block device

Details Anti-two block device Anti-two block device

1990-08-17

1993-11-23

Matecki, Katherine

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

212152, B66C 2390, B66D 148

Patent

active

052636607

ABSTRACT:
An anti two-blocking device for preventing a lower load block (46) on a crane (10) from coming in contact with an upper load block (44) affixed adjacent a boom point (40). The device comprises a cable follower (60) through which the crane's cable (26) is threaded, situated between the upper load block (44) and the lower load block (46). When the lower load block (46) is within a predetermined distance of the upper load block (44), the lower load block (46) reaches the cable follower (60) and exerts an upwards force which causes the cable follower (60) to activate an actuator (70) for a switch (72). The switch (72) deactivates all activity on the crane (10) which could cause the lower load block (46) to come in contact with upper load block (44). This activity includes lowering the boom (30), reeling in the cable (26) and extending the telescoping sections of the boom (32 and 33).

REFERENCES:
patent: 2428578 (1947-10-01), Nelles
patent: 2778506 (1957-01-01), Harry
patent: 3969714 (1976-07-01), Greer
patent: 4170308 (1979-10-01), Rogers
patent: 4280628 (1981-07-01), Goss et al.
patent: 4447043 (1984-05-01), Bocchiaro
patent: 4591131 (1986-05-01), Rhoads
patent: 4804095 (1989-02-01), Rohr et al.

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