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Fire door and operator therefor

  • US 4,147,197 A
  • Filed: 06/20/1977
  • Issued: 04/03/1979
  • Est. Priority Date: 06/20/1977
  • Status: Expired due to Term
First Claim
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1. In a control device for a fire door having a roll with a flexible panel wrappable therearound, wherein said control device includes energy storage means releasable in response to a signal, such as the melting of a fusible link, for initiating unwrapping rotation of said roll, and wherein said roll after such initiating will continue to rotate in response to the gravitational effect on the panel unwrapping therefrom, the improvement comprising:

  • shaft means coaxially affixed to said roll;

    actuating means connected to said shaft means for rotating same in a panel wrapping direction;

    frictional means operably connected to said shaft means for limiting the rate at which said panel is unwrapped from said roll;

    clutch means releasably connecting said frictional means to said actuating means, said clutch means having a pair of separable parts and resilient means urging said parts into driving engagement;

    disconnect means for disengaging said clutch means in response to said melting of said fusible link, said disconnect means including cam means operable to separate said parts, whereby to disengage said clutch means so that said shaft means is disconnected from said actuating means; and

    torque means mounted to move under the force of gravity to operate said cam means to disengage said clutch means, said movement of said torque means being responsive to said melting of said fusible link.

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