Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1982-01-06
1985-05-14
Dorner, Kenneth J.
Machine element or mechanism
Control lever and linkage systems
Elements
74577S, 74531, 74576, G05G 506
Patent
active
045164428
ABSTRACT:
A ratchet device is provided and includes a ratchet mechanism mounted in a housing assembly and a work arm protruding therefrom. The ratchet mechanism includes a ratchet wheel which is secured to the work arm and which is rotatably mounted on an axle and a pawl arm which is mounted at one end in the housing assembly and which is biased to engage canted ratchet teeth on the circumferential surface of the ratchet wheel. A pawl release member selectively moves the pawl arm between one position permitting engagement of its free end with the ratchet teeth and a second position disengaging the free end from the ratchet teeth. A detent is provided to maintain the pawl release member in a selected one of these positions. Preferably, the detent includes a rotatable shaft having a cam which defines the detent and a notch which receives a portion of the pawl arm to define a pawl release. The shaft is preferable oriented parallel to the axis of the axle to define a plane of symmetry. A pair of mounting members are oriented symmetrically about this plane, and the ratchet wheel is mountable in reverse orientations on the axle in correspondence to a selected mounting member to which the pawl arm is secured in order to selectively define left-handed and right-handed ratchet structures.
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patent: 4038508 (1977-07-01), Mapeloden
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