Point of operation safety device

Details Point of operation safety device Point of operation safety device

1981-08-05

1983-07-26

Griffin, Donald A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

100 53, 192134, 200 6142, H01H 316, F16D 900, B30B 1514

Patent

active

043956416

ABSTRACT:
A point of operation safety device for hydraulic or pneumatic presses. The safety device includes a probe which descends by gravity toward the work area when the operator initiates the cycle. If during the descent of the probe no obstruction is encountered and the probe sufficiently enters the work area, a limit switch is automatically closed by the probe shaft to energize the control circuit of the press.
Switch means are provided for retracting the ram of the press if the operator pushes up on the probe after the cycle has started. Relay means are provided to prevent the press from recycling at the end of one cycle, unless the operator again closes the circuit of the safety device. Further, a box construction is provided to jam the probe assembly to prevent initiation of the cycle when the cover to the box which houses the safety device is in the open position.

REFERENCES:
patent: 3129799 (1964-04-01), Dean et al.
patent: 3315049 (1967-04-01), Cain
patent: 3487182 (1969-12-01), Grundy
patent: 3939314 (1976-02-01), Loeser

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