Safety ensuring apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 30, 1997
Grant Date -
N/A
app pub date -
Oct 7, 1996
filing date -
Feb 7, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A movable section of a machine is enclosed by a fence and a door. A locking device provided on the door is controlled by a movable section control circuit. In the movable section control circuit, an operating switch outputs either a movable section ON signal or a movable section OFF signal. A door switch outputs an ON signal representing that the door is open. A switch means constitutes a self-holding circuit which uses an AND signal constituted of the movable section OFF signal from the operating switch and a rotation stop signal as a reset input signal and an OR signal constituted of an ON signal from the door switch and a rotation-presence signal as trigger signal to provide the locking device with a control signal. When a sensor fails, the locking devive is not unlocked even if the operating switch for driving the movable section is closed.
First Claim
Family
International Classification(s)
Cited Art Landscape
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