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Brake release device attached to a door machine

  • US 8,807,294 B2
  • Filed: 01/06/2012
  • Issued: 08/19/2014
  • Est. Priority Date: 08/26/2011
  • Status: Active Grant
First Claim
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1. A brake release device (40) attached to a door machine, said door machine (1) comprises an axle (2), a brake device (10) for braking said axle (2), a brake release bar (20) provided at the outside of said door machine (1) for actuating said brake device (10) to release said axle (2), and a pull chain disc (31) for rotating said axle (2), wherein said brake release device (40) comprises:

  • a ring plate (41) fixed on a lateral end face of said pull chain disc (31), a plurality of equally spaced openings (411) being formed along the entire circumference of said ring plate;

    a base plate (43) provided at the outside of said door machine (1), and having a horizontal guiding portion (431) at one end thereof;

    a passive plate (44) having a plurality of plug pins (441) corresponding to said openings (411) of said ring plate (41) being provided on one end face thereof, said passive plate being guided by said guiding portion (431) to move between a first position in which said plug pins (441) are separated from said openings (411), and a second position in which said plug pins (441) are inserted into corresponding openings (411);

    a guiding member (45) parallel to said axle (2) being disposed on said base plate (43), said guiding member (45) having an axial guiding hole (451);

    a sliding pin (46) mounted within said guiding hole (451) for sliding therein, one end of said sliding pin (46) corresponding to said brake release bar (20) and the other end of said sliding pin (46) being connected to said passive plate (44);

    a spring element (47) accommodated in said guiding hole (451), one end of said spring element (47) abutting against said guiding member (45) and the other end of said spring element (47) abutting against said sliding pin (46) to an effect that said sliding pin (46) is compressed by said spring element and tends to move toward said brake release bar (20); and

    a fusible link device (48) having one end provided at a predetermined position, and the other end connected with said sliding pin (46) through a connecting member (481) so as to resist the restoring force of said spring element (47), so that the sliding pin is maintained at a distance from said brake release bar (20), and said passive plate (44) is maintained at said first position;

    when the surrounding temperature exceeds the melting point of said fusible link device (48), said fusible link device (48) melts and said connecting member (481) connecting said sliding pin is released, and said sliding pin (46) slides toward said brake release bar (20) under the action of the restoring force of said spring element to impact against said brake release bar (20) so as to release said brake device (10), whereby said passive plate (44) is actuated to move to said second position.

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