Door closer
First Claim
1. In a door closer, a combination comprising a closer shaft adapted to be connected to a door to be closed and being turnable about its axis between a first position in which a door connected thereto is closed and a second position in which the door is opened;
- spring means arranged for biasing said closer shaft to said first position, said spring means having a fixed first end and a second end movable from a first to a second position in which said spring means is further stressed than in said first position;
means between said closer shaft and said second end of said spring means for moving the latter to said second position;
releasable arresting means for holding said second end of said spring means in said second position to thus prevent said spring means from biasing said closer shaft to said first position so that said closer shaft is freely turnable between said positions thereof; and
means for releasing said arresting means so that said second end of said spring means may move from said second to said first position to thereby bias said closer shaft to said first position thereof, said releasable arresting means and said means for releasing said arresting means being arranged coaxially with said spring means.
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Accused Products
Abstract
A hydraulically controlled door closer in which a spring cooperating with a piston reciprocatable in a fluid filled bore urges a closer shaft operatively connected to the piston to a position in which a door connected to the closer shaft is closer. The spring is tensioned during turning of the closer shaft in a door opening direction and may be releasably held in the tensioned condition by an additional piston located between one end of the spring and the first-mentioned piston and provided with a first passage therethrough in which a one-way valve is located in a second passage which may be closed and opened by an electromagnetically operated valve.
38 Citations
11 Claims
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1. In a door closer, a combination comprising a closer shaft adapted to be connected to a door to be closed and being turnable about its axis between a first position in which a door connected thereto is closed and a second position in which the door is opened;
- spring means arranged for biasing said closer shaft to said first position, said spring means having a fixed first end and a second end movable from a first to a second position in which said spring means is further stressed than in said first position;
means between said closer shaft and said second end of said spring means for moving the latter to said second position;
releasable arresting means for holding said second end of said spring means in said second position to thus prevent said spring means from biasing said closer shaft to said first position so that said closer shaft is freely turnable between said positions thereof; and
means for releasing said arresting means so that said second end of said spring means may move from said second to said first position to thereby bias said closer shaft to said first position thereof, said releasable arresting means and said means for releasing said arresting means being arranged coaxially with said spring means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- spring means arranged for biasing said closer shaft to said first position, said spring means having a fixed first end and a second end movable from a first to a second position in which said spring means is further stressed than in said first position;
Specification