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US 4,664,170 AGranted
Rolling firedoor
AssigneeMartinray Industries Ltd.
InventorH. M. Robert Labelle
Life of this patent
Estimating the term…
Abstract
A rolling firedoor having a closure drum on which a closure is wound, and a chaindrive for rotating the drum to raise or lower the closure. The chaindrive is disconnected from the drum during a fire. Means are provided for reconnecting the chaindrive to the drum from the ground so that the door can be raised in an emergency.
Claims9
A rolling firedoor having:
- a support drum adapted to be mounted horizontally across the top of an opening;
- a closure comprising a series of horizontally extending slats hingedly connected together, the closure attached at one end to the drum and adapted to be wound up on the drum when the drum is rotated in one direction;
- rotating means, operable from the ground, for rotating the drum in either direction to wind or unwind the closure on or off the drum;
- disengaging means for automatically disengaging the drum from the rotating means when a fire detecting means is actuated to allow the closure to unwind off the drum by gravitational force;
- braking means movable between an inoperative position, disconnected from the drum, and an operative position, connected to the drum for controlling the unwinding of the closure off the drum;
- means operatively connecting the disengaging means with the braking means to automatically move the braking means to the operative position simultaneously with the disengagement of the drum from the rotating means;
- and re-engaging means, operable from the ground, for re-engaging the drum with the rotating means and simultaneously moving the braking means to the inoperative position so the closure can be raised by the rotating means in an emergency.
4 more elements
A rolling firedoor having:
- a support drum adapted to be mounted horizontally across the top of an opening;
- a closure comprising a series of horizontally extending slats hingedly connected together, the closure attached at one end to the drum and adapted to be wound up on the drum when the drum is rotated in one direction;
- rotating means, operable from the ground, for rotating the drum in either direction to wind or unwind the closure on or off the drum,
- the rotating means comprising a chain drive operable from the ground and a clutch slidably mounted on an axle of the drum, the clutch connected to the chain drive operable, in a first position on the axle, to rotate the drum when the chain drive is operated, and in a second position on the axle, to not rotate the drum when the chain drive is operated;
- disengaging means for automatically disengaging the drum from the rotating means when a fire detecting means is actuated to allow the closure to unwind off the drum by gravitational force;
- the disengaging means comprising an actuating member retained in a raised position by a wire having a fusible link therein, and a clutch lever located beneath the actuating member when said member is in a raised position, and operably connected to the clutch, whereby when the fusible link breaks, the actuating member drops to a lowered position and in so doing moves the clutch lever to move the clutch from its first position to its second position;
- braking means for controlling the unwinding of the closure off the drum;
- the braking means employing the actuating member;
- means for pivotally mounting the actuating member for swinging movement in its lowered position;
- an escapement wheel fixed on the axle of the drum;
- and escapement means on the actuating member which cooperate with the escapement wheel when the actuating member is in its lowered position to control the speed of rotation of the drum as the closure is unwinding;
- and re-engaging means, operable from the ground, for re-engaging the rotating means with the drum, and disconnecting the braking means, so the closure can be raised by the rotating means in an emergency.
9 more elements
Dependencies are inferred from the claim text.