Release mechanism for a door spring
First Claim
1. A release mechanism for releasing a door-spring blocked by a blocking device when a temperature is reached, said release mechanism comprising:
- a temperature-sensitive control element made with a shape memory effect material and operatively adapted for direct thermal actuation and thereby enabling said release mechanism to intervene in a operation of the blocking device to release the door-spring when said control element is at the temperature;
a rod guided for movement in a longitudinal direction between a first end position and a second end position, said rod being moved in the direction of said first end position by a first bias, and said control element being operatively adapted to apply a second bias greater than said bias to move said rod in an opposite direction thereto; and
a control member actuated by movement of said rod and operatively adapted to keep the blocking device in operation when said rod is in said first end position and to render the blocking device inoperative when said rod is in said second end position.
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Accused Products
Abstract
Release mechanism for releasing a door-spring blocked by a blocking device, which mechanism comprises a temperature-sensitive control element for direct thermal actuation, by means of which the mechanism intervenes in the blocking device at a predetermined temperature of that element such that the door-spring is released. The release mechanism comprises for instance a rod guided for movement in longitudinal direction between a first end position and a second end position under a first bias in the direction to this first end position, and a control element comprising an SME material which at the predetermined temperature encloses the rod under a second bias greater than the first and in opposite direction thereto, which rod is coupled to a control member of the blocking device, which control member keeps the blocking device in operation in the first end position of the rod and renders the blocking device inoperative in the second end position of the rod. The release mechanism may further comprise a control circuit.
44 Citations
25 Claims
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1. A release mechanism for releasing a door-spring blocked by a blocking device when a temperature is reached, said release mechanism comprising:
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a temperature-sensitive control element made with a shape memory effect material and operatively adapted for direct thermal actuation and thereby enabling said release mechanism to intervene in a operation of the blocking device to release the door-spring when said control element is at the temperature; a rod guided for movement in a longitudinal direction between a first end position and a second end position, said rod being moved in the direction of said first end position by a first bias, and said control element being operatively adapted to apply a second bias greater than said bias to move said rod in an opposite direction thereto; and a control member actuated by movement of said rod and operatively adapted to keep the blocking device in operation when said rod is in said first end position and to render the blocking device inoperative when said rod is in said second end position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification