Automatic ratchet block

Details Automatic ratchet block Automatic ratchet block

1992-06-29

1994-06-14

Luong, Vinh T.

Machine element or mechanism

Elements

Pawls and ratchets

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

Patent

active

053199979

ABSTRACT:
A ratchet block comprised of a frame, moveable sheave 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: 2718949 (1955-09-01), Taylor
patent: 3421605 (1969-01-01), Hansen
patent: 3606940 (1971-09-01), Finkeldei
patent: 4028954 (1977-06-01), Mehnert
patent: 4093185 (1978-06-01), Newell
patent: 4130271 (1978-12-01), Merriman
patent: 4685632 (1987-08-01), Yeh
patent: 4702486 (1987-10-01), Tsuchie

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