Device to remove concentric knockouts in electrical apparatus

Details Device to remove concentric knockouts in electrical apparatus Device to remove concentric knockouts in electrical apparatus

1978-06-16

1980-02-26

Smith, James G.

Tools

Receptacle closure remover

Gripping type

7144, 30360, B25B 2700

Patent

active

041899644

ABSTRACT:
A device to remove concentric knockouts from electrical apparatus comprising a pair of handles adapted to open and close about a pivotal point, a first and second lever attached to the handles proximate their pivotal point, said levers having a common fulcrum or pivotal point interposed one end, and a shearing and punch assembly attached to the other ends. The shearing and punch assembly comprises an elongated shaft pivotally attached at the free end of the first lever with a rounded enlarged punching nose on the other end, the shaft encircled by a plurality of concentric cylinders, the inner cylinder of which is pivotally attached to the free end of the second lever and the outer of the concentric cylinders rotatable in a nonslidable position about the inner cylinder, the outer cylinder having attached to its periphery a shear segment which extends beyond the end of the cylinder, the elongated shaft permitted to slide interiorly to the inner cylinder whereby metal concentric or eccentric knockouts in electrical apparatus may be placed between the shaft enlarged nose and the shearing segment, such that when the shaft enlarged nose is drawn towards the shearing segment, the metal will be sheared; the shaft nose end also adapted to punch out a pre-punched center knockout in electrical apparatus before the concentric knockouts are sheared by the tool.

REFERENCES:
patent: 1061661 (1913-05-01), Cloes
patent: 2329387 (1943-09-01), Brenning
patent: 3025600 (1962-03-01), Leibinger
patent: 3105299 (1963-10-01), Wirtanen
patent: 3564716 (1971-02-01), Burrows
patent: 3790976 (1974-02-01), Stencil
patent: 3835860 (1974-09-01), Garretson

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