Relating to a ratchet machanism

Details Relating to a ratchet machanism Relating to a ratchet machanism

1990-02-01

1990-12-18

Luong, Vinh T.

Machine element or mechanism

Elements

Pawls and ratchets

74577R, 74577M, 242223, 188 63, 192 431, G05G 100, G05G 300

Patent

active

049777955

ABSTRACT:
A ratchet mechanism comprising a rotatable member incorporating a toothed periphery, the rotatable member being suitably mounted to allow free rotation thereof, a pawl incorporating apparatus for engaging the toothed periphery, the pawl being suitably mounted to permit movement thereof from a position in which the pawl allows said rotatable member to rotate freely in either direction of rotation to a position in which the pawl prevents said rotatable member from rotating in one direction, and selectively operable apparatus to move the pawl between said positions, said selectively operable apparatus incorporating an over-dead-center spring arrangement to bias the pawl into the selected position.

REFERENCES:
patent: 2593700 (1952-04-01), Rosner
patent: 2708555 (1955-05-01), Heinemann et al.
patent: 2964257 (1960-12-01), Hull
patent: 2976959 (1961-03-01), Husted
patent: 2984433 (1961-05-01), Clark
patent: 3540306 (1970-11-01), Nurmse
patent: 3829041 (1974-08-01), Nepote
patent: 3939729 (1976-02-01), Brockelsby
patent: 3979081 (1976-09-01), Miyamae
patent: 4201355 (1980-05-01), Ruin
patent: 4496115 (1985-01-01), Kreft et al.

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