Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Liquid
Patent
1991-03-19
1992-05-12
Spruill, Robert L.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Liquid
16 52, E05F 304
Patent
active
051115484
ABSTRACT:
A door closer which comprises a damper having a body case including an arm fixed to a door, a rotational shaft formed in the body case, a pair of chambers filled with high viscous liquids, a pair of rotary blades respectively having passages with check valves on the rotational shaft, the rotary blades being rotated together with a rotational shaft by a sub case fixed with a sub arm against a return spring at the time of opening the door, the door being effected by the resistance force of the high viscous liquid against the closing door, a stationary plate fixed to the body case, an intermediate plate so engages as to be rotatable at a predetermined angle against the return spring, a movable plate so engaged with the sub case as to be rotatable together with the sub case, a plurality of rotary connectors respectively movably engaged with a plurality of through holes on the rotating circumferential line of the intermediate plate, and an angle clutch formed with recesses to be engaged with the rotary connectors corresponding to the through holes of the rotary connectors. Thus, the door closer can provide a locking state of power accumulated by a return spring at a predetermined door opening angle and a freely stopping state.
REFERENCES:
patent: 2861291 (1958-11-01), Milton
patent: 3039133 (1962-06-01), Milton et al.
patent: 3357040 (1967-12-01), MacDonald
patent: 4325164 (1982-04-01), Sasaki
Cuda Carmine
Spruill Robert L.
Sugatsune Industrial Co. Ltd.
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