Piston-type door closer with adjustable closing speeds

Details Piston-type door closer with adjustable closing speeds Piston-type door closer with adjustable closing speeds

1994-08-12

1995-12-26

Bradley, P. Austin

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

Checks and closers

Liquid

16DIG9, 16 84, 16 66, E05F 300, E05F 510

Patent

active

054775892

ABSTRACT:
A multi-stage door closer for automatically closing a door after the door is opened; it contains a cylinder having three sections each with a different diameter. The middle section has the largest diameter. A pair of speed adjusting mechanisms are provided which are sleeved about a piston rod placed inside the cylinder. Each of the speed adjusting mechanism contains a rotatable piston head, which will rotate with the cylinder, and a fixed piston head, which will not rotate with the cylinder. By cooperated actions among the variously-sized sections of the cylinder and the pair of speed adjusting mechanisms, each speed adjusting mechanism can be separately adjusted to control the door closing speed at various stages of the door closing action. For example, the door closer can be designed such that the first speed adjusting mechanism is made to control the door closing speed during the first 10.degree.; whereas, the second speed adjusting mechanism is made to control the door closing speed after the first 10.degree.. Other arrangements are possible and can be easily designed.

REFERENCES:
patent: 4180888 (1980-01-01), Nagase
patent: 4230309 (1980-10-01), Schnitzius
patent: 4817238 (1989-04-01), Liu
patent: 5157806 (1992-10-01), Wartian

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