Safety switch for generating a system enable signal depending on the position of a movable guard door
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United States of America Patent
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Aug 26, 2014
Grant Date -
Oct 27, 2011
app pub date -
May 13, 2011
filing date -
Nov 25, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A safety switch for generating a system enable signal depending on the position of a movable guard door which is used for safeguarding a hazardous area of a machine installation. At least one part of the machine installation can only be operated when the system enable signal is present. The safety switch has a door part to be fastened to the movable guard door and a frame part to be fastened to a mating door piece. The safety switch also has a bolt which can be moved between a first position and a second position, a recess in which the bolt can engage in the second position, and a locking element designed to block the bolt in the second position. In addition, the safety switch comprises a first position sensor designed to clearly detect at least one of the positions of the bolt in order to generate the system enable signal. Moreover, the safety switch comprises a door release request unit configured to generate a door release request signal in addition to the system enable signal.
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