Automatic ratchet block

Details Automatic ratchet block Automatic ratchet block

1994-03-18

1996-04-30

Luong, Vinh T.

Machine element or mechanism

Elements

Pawls and ratchets

74575, 74577R, 74505, 74506, 192 46, 254352, 254266, G05G 100, B66D 114

Patent

active

055114474

ABSTRACT:
A ratchet block comprised of a frame, movable sheave assembly, ratchet assembly, ratchet assembly and cam wherein the ratchet automatically engages under load permitting rotation of the sheave in only one direction, and disengages when the load is removed permitting rotation in both directions. This automatic engagement and disengagement of the ratchet to increase or reduce friction when a rope or wire is run through the sheave does not require the user to disengage the ratchet mechanism with a conventional switch.

REFERENCES:
patent: 632910 (1899-09-01), Wiley
patent: 2184149 (1939-12-01), Marr
patent: 2633953 (1953-04-01), Gorske
patent: 2690240 (1954-09-01), Schroeder
patent: 2708555 (1955-05-01), Heinemann et al.
patent: 2718949 (1955-09-01), Taylor
patent: 3421605 (1969-01-01), Hansen
patent: 3606940 (1971-09-01), Finkeldei
patent: 3829041 (1974-08-01), Nepote
patent: 4028954 (1977-06-01), Mehnert
patent: 4093185 (1978-06-01), Newell
patent: 4130271 (1978-12-01), Merriman
patent: 4496115 (1985-01-01), Kreft et al.
patent: 4685632 (1987-08-01), Yeh
patent: 4702486 (1987-10-01), Tsuchie
patent: 4977795 (1990-12-01), McVey

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