Shear mechanism

Cutting – Means to drive or to guide tool – With simple rectilinear reciprocating motion only

Patent

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Details

83639, B26D 512

Patent

active

040540758

ABSTRACT:
The shear mechanism includes two fixed plates and a plate movable therebetween. The movable plate has a notch in one side edge which is moved out of registry with notches in the fixed plate to effect a shearing operation, the movable plate having a blade associated with its notch and one of the fixed plates having a cooperable blade associated with its notch. The fixed plates each have two appropriately located circular holes in which are received a first pair of pins, the pins extending through slots in the movable plate so that the blade on the movable plate can move sufficiently relative to the blade on the fixed plate to perform its shearing operation. Offset from the slots in the movable plate are two appropriately located circular holes in which are received a second pair of pins, the second pair of pins extending through slots in the fixed plate of sufficient size so that the shearing action can take place. A first pair of actuating arms (one at each side of the mechanism) is pivotally mounted on one of the first pair of pins and a second pair of actuating arms (one at each side of the mechanism) is pivotally mounted on the other of said first pair of pins. The first pair of actuating arms is pivotally connected to one of the second pair of pins, and the second pair of actuating arms is pivotally connected to the other of said second pair of pins with the consequence that the movable plate is supported on and actuated by said arms so that when the ends of the arms remote from said first and second pair of pins are forcibly spread apart, the notch in the movable plate is moved out of registry with the notches in the fixed plates to enable the blades to perform the shearing operation.

REFERENCES:
patent: 3255655 (1966-06-01), Stockard, Jr.

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