Machine element or mechanism – Elements – Guard mechanisms
Patent
1977-06-22
1979-02-06
Braun, Leslie
Machine element or mechanism
Elements
Guard mechanisms
192134, F16P 100, G05G 2500
Patent
active
041377958
ABSTRACT:
A safety guard apparatus for a power press prevents the ram of the press from descending until the safety guard is in position to protect the operator. On presses which are equipped with part revolution clutches, the safety guard apparatus causes the ram to stop if the safety guard sensor is raised during operation. The safety guard is reciprocably mounted in a frame attached to the power press, and a sensing member is movably mounted on the safety guard. The bottom edge of the sensing member extends below the safety guard, and upward movement of the sensing member moves a switch-contacting rod out of engagement with a normally closed switch which is held open by the rod. The safety guard is raised and lowered by a power cylinder, and when the sensing member is raised and the normally closed switch closes, the power cylinder raises the safety guard. The normally closed switch on the reciprocating safety guard is electrically connected to wires on the frame by bus rods which are mounted on the safety guard and which slide through contact members on the guard frame. If the sensing member does not engage anything as the safety guard moves downwardly, an abutment on the bus rods engages and closes a normally open switch on the guard frame, and power is supplied to the ram to lower the ram. Power is transmitted to the ram by a clutch which is operated, for example, by a foot pedal or hand buttons. A control apparatus for the clutch prevents movement of the ram until the normally open switch on the guard frame is closed by the safety guard, and the control apparatus stops the ram if the sensing member is raised to permit the held-open normally closed switch to close. Premature closing of the normally open switch on the guard frame results in total lockout of the system. A reset button must be depressed before power to the system can be restored.
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