Arrangement for controlling an angularly movable member

Details Arrangement for controlling an angularly movable member Arrangement for controlling an angularly movable member

1999-12-20

2001-06-05

Browne, Lynne H. (Department: 3629)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Checks and closers

Liquid

C016S051000, C016S063000, C016S065000, C016S076000, C016S077000

Reexamination Certificate

active

06240598

ABSTRACT:

This invention relates to an arrangement for controlling the movement of an angularly movement member, and has particular application to devices for controlling the movement of a wing, such as a door. Such devices include upright door closers, spring hinges and floor springs.
With known door closers the checking or regulation of the closing of the door is effected by the flow of hydraulic fluid, normally oil, from one side of a piston to the other. This involves the provision of machined fluid flow passages, and the normal sealing and pressures constraints associated with the use of hydraulic fluid.
An object of the invention is to provide an improved arrangement for controlling the movement of an angularly movable member.
According to the invention there is provided a control mechanism comprising:
a shaft being angularly movable between a normal position and a second position, the shaft having a first portion and a second portion;
a biasing means attached to the shaft first portion for returning the shaft to the normal position from the second position; and
a damping mechanism attached to the shaft second portion, the damping mechanism resisting movement of the shaft when the shaft moves from the second position to the normal position.
Preferably said damping mechanism provides little or no resistance to movement of the shaft from the normal position to the second position.
Desirably the damping mechanism includes a non-pressurised damping medium, acting between the shaft and a further member. The damping mechanism can be a cage positioned about the strap-like member.
Conveniently the damping mechanism includes a coiled strap-like member. More preferably, the strap-like member is keyed to the shaft.
Advantageously the damping mechanism is a viscous coupling comprising a fluid chamber containing a non-pressurised damping medium, in which chamber is disposed a coiled strap-like member, keyed to one of the shaft or a housing part surrounding the shaft, wherein the strap-like member is wound about and off the housing part upon angular movement of the shaft in opposite directions respectively, the winding of the strap-like member about the housing part slowing the angular movement of the shaft taking place under the action of the biasing means.


REFERENCES:
patent: 528321 (1894-10-01), Blount
patent: 1807607 (1931-06-01), Smith
patent: 1965805 (1934-07-01), Riggins
patent: 2544372 (1951-03-01), Werner
patent: 2639459 (1953-05-01), Werner
patent: 2705631 (1955-04-01), Reichold
patent: 3387320 (1968-06-01), Waldo
patent: 5752293 (1998-05-01), Lowry et al.

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