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US 8,910,345 B2Granted
Door closer
AssigneeIngersoll Rand Security Technologies
InventorsTimothy Bland, James Frost, David Williams, Lee Melville
Life of this patent
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AssigneeIngersoll Rand Security Technologies
InventorsTimothy Bland, James Frost, David Williams, Lee Melville
Estimating the term…
A door closer has a housing for connection to a door and a drive spindle (10) coupled to the door. As the door moves the spindle (10) and housing (11) rotate relative to one another. The relative movement is translated by a piston and cam mechanism (21, 22) into a force that is used to separate a pair of magnets (28). The magnetic attraction of the magnet pairs (28) serves as a force to resist opening of the door and biases the door from an open to a closed position. At least one first magnet is coupled to the drive member and at least one second magnet (32) coupled to the housing. The magnets are arranged in the housing with their opposite poles facing one another such that there is a magnetic force of attraction between them. At least one further biasing spring (36) may be provided to provide a biasing force after the magnetic force has diminished by separation of the magnets.
A door closer configured to be fitted to a door or door frame, the door closer comprising a housing and a spindle disposed in and extending from the housing to enable connection between the door and the door frame, the spindle being disposed for rotation about an axis relative to the housing as the door moves between open and closed positions, at least one first magnet means coupled to the spindle by a piston and cam arrangement, the piston being reciprocally disposed in the housing and the cam being positioned between the piston and the spindle, at least one second magnetic means connected to the housing, the at least one first and second magnetic means arranged in the housing with their opposite poles facing one another such that there is a magnetic force of attraction between them, whereby relative movement of the housing and the spindle effects relative movement of the at least one first and second magnetic means between proximal and distal positions, the at least one first and second magnetic means being biased to the proximal position by the magnetic force of attraction, at least one of the first and second magnetic means being a permanent magnet.
Dependencies are inferred from the claim text.