Lifting clamp cam wear indicator and method

Details Lifting clamp cam wear indicator and method Lifting clamp cam wear indicator and method

1985-09-18

1987-02-10

Cherry, Johnny D.

Handling: hand and hoist-line implements

Grapple

Pivoted cam and hook

116208, 294902, B66C 148, G01D 2100

Patent

active

046418776

ABSTRACT:
A plate lifting clamp has an eccentric cam with spaced apart teeth having sharp crest edges which are provided with slots extending radially into the teeth. Excessive wear on the teeth may be visually observed by the decreasing depth of the slot or disappearance thereof on any one tooth. The tooth crests may be curved in a plane parallel to an axis of rotation of the cam so that a generally elliptical shaped surface appears on the tooth crest as it is worn away. The length of the wear surface may be measured to determine when cam replacement is desirable.

REFERENCES:
patent: 1351530 (1920-08-01), Meals
patent: 2393101 (1946-01-01), Gardner
patent: 2706509 (1955-04-01), White
patent: 3384145 (1968-05-01), Wolfer
patent: 3414272 (1968-12-01), Rogers
patent: 4226274 (1980-10-01), Awaya et al.

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