Improvements relating to ventilators

专利名称：Improvements relating to ventilators发明人：TREGENNA, Brian Charles,CHURCHILL,

Richard William

申请号：EP87310382.4申请日：19871125公开号：EP0270297A1公开日：19880608

专利附图：

摘要：An opening flap ventilator for buildings has pneumatic opening springs (13) andelectric motor-gear drive mechanism (14) operable to close the ventilation flap (11). Themechanism has an electrically energised clutch (54) interposed in the gear drive chain (24,

26, 28, 48, 46) (see Fig. 2). On de-energisation of the clutch (54), which may be automatic inresponse to the detection of a fire condition occurring, the ventilation flap (11) isautomatically opened. The flap (11) is subsequently closed by operation of the motorwhich drives a winch pulley (20) for winding in a single operating cable (76) in oppositedirections from a location between its ends. The winch pulley (20) is of split constructionand can be dismantled to enable the motor-gear drive unit to be removed whilst leavingthe operating cable (76) in place. The gear drive mechanism holds the flap (11) locked inits closed position so long as the clutch (54) remains energised. The motor may be drivenin reverse to allow the flap to open under the action of the springs (13) for normal day-to-day ventilation.

申请人：COLT INTERNATIONAL LIMITED

地址：New Lane Havant Hampshire PO9 2LY GB

国籍：GB

代理机构：Slight, Geoffrey Charles

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