发明名称 |
Pneumatic door-operating arrangement |
摘要 |
A pneumatic door control equipped with a door control valve for operating a door drive to an open or a closed position. The door control valve has an opening and a closing solenoid-operated pilot valve and an opening and closing spool valve, each operable to a passage or a vent position. A shuttle valve is part of the control valve and works in conjunction with an operator-controlled emergency valve to vent both spool valves simultaneously. A differential pressure switch is connected to the door drive to sense abnormal pressure expended in a door-opening or closing movement. Such an occurrence will output a signal to an electronic switching device which also monitors, via limit switches, whether a door is fully opened or fully closed. If excess pressure occurs during a door-closing movement, the switching device will trigger the control valve to reverse to the opening position. If excess pressure occurs during an opening movement, the switching device triggers both solenoid-operated pilot valves simultaneously. The control valve has a non-return valve which recognizes the dual triggering condition and outputs to the shuttle valve so that the two spool valves can be vented simultaneously. A throttle valve is disposed between the emergency valve and control valve for restricting the flow of pressurized air following an emergency condition.
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申请公布号 |
US4523513(A) |
申请公布日期 |
1985.06.18 |
申请号 |
US19830507820 |
申请日期 |
1983.06.27 |
申请人 |
WABCO WESTINGHOUSE FAHRZEUGBREMSEN GMBH |
发明人 |
GUDAT, WOLFGANG;KLATT, ALFRED;SEBESTA, GUNTER |
分类号 |
E05F15/02;(IPC1-7):F15B11/10;F15B13/043 |
主分类号 |
E05F15/02 |
代理机构 |
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代理人 |
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主权项 |
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