Patent ID: 8191939
Filing Date: 2012-06-05
Classification: E05B,Y10S,Y10T

Abstract:
1. A fire bolt assembly for a door comprising, in combination: a receiving tube adapted to be mounted in a door, with the receiving tube including front and rear ends spaced along a first axis with the receiving tube further including a receiving space extending along the first axis and having an opening in the front end of the receiving tube; a mounting member including a mounting plate adapted to be fixed on an end face of the door, with the mounting plate having first and second faces spaced along the first axis, with the mounting member further including a sleeve protruding from the second face and extending away from the first face of the mounting plate along the first axis, with the mounting member further including an axial hole extending from the first face of the mounting plate through the sleeve along the first axis, with the sleeve of the mounting member extending through the front end of the receiving tube and received in the receiving space of the receiving tube, with the sleeve of the mounting member including first and second coupling faces spaced along a second axis perpendicular to the first axis, with each of the first and second coupling faces spaced from the second face of the mounting plate along the first axis; a stop member mounted in the axial hole of the mounting member and including a stop plate having front and rear surfaces spaced along the first axis, with the stop member further including first and second legs spaced along the second axis and each protruding from the rear surface and extending away from the front surface of the stop plate along the first axis, with each of the first and second legs extending into the axial hole of the mounting member, with each of the first and second legs including a connecting end interconnected to the rear surface of the stop plate and a free end distant to the rear surface of the stop plate, with the free end spaced from the connecting end along the first axis, with each of the first and second legs further including outer and inner side faces spaced along the second axis, with the inner side faces of the first and second legs facing each other, with a spacing perpendicular to the first axis between the inner side faces of the connecting ends of the first and second legs being smaller than that between the inner side faces of the free ends of the first and second legs, with a hook formed on the outer side face of the free end of each of the first and second legs and including an engaging face extending in a third axis perpendicular to the first and second axes, with the engaging face of each of the hooks engaging with one of the first and second coupling faces of the sleeve of the mounting member, with the outer side face of the connecting end of each of the first and second legs spaced from the sleeve of the mounting member; a positioning bolt received in the receiving space of the receiving tube, with the positioning bolt including front and rear ends spaced along the first axis; and with the stop member made of material having a melting point lower than those of the mounting member, the positioning bolt, and the receiving tube, with the stop member holding the positioning bolt in the receiving space of the receiving tube, with the spring biasing the front end of the positioning bolt out of the front end of the receiving tube when the stop member melts, with the front end of the positioning bolt including an abutting periphery tapering away from rear end of the positioning bolt, with the abutting periphery of the positioning bolt pressing against the inner side faces of the first and second legs of the stop member under the bias of the spring, accommodating the positioning bolt in place and preventing the stop member from disengaging from the receiving tube, with the front end of the positioning bolt spaced from the rear surface of the stop plate along the first axis.