Control system for pressure-sensitive protective devices
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United States of America Patent
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Jul 16, 2002
Grant Date -
N/A
app pub date -
Sep 17, 1999
filing date -
Sep 18, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control for use with pressure-sensitive devices, such as in a machine-guarding application. A plurality of pressure-sensitive devices, such as pressure-sensitive safety mats, are operatively connected to produce a disable signal and a status signal. An activation module produces a switching output responsive to the disable signal and the status signal to disable a machine. In one embodiment the status signal is produced by a comparator in response to a quantity selector and a quantity indication signal produced by the pressure-sensitive devices. In the preferred embodiment, the control system of the present invention is able to detect proper safety mat configuration, whether a threshold pressure is being applied to a pressure-sensing region in the plurality of safety mats, and whether the quantity of operatively coupled safety mats conforms to the quantity specified to be deployed.
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