Mechanism control device

Details Mechanism control device Mechanism control device

1978-01-23

1980-04-08

Herrmann, Allan D.

Machine element or mechanism

Automatic operation or control

74110, 74469, 137 73, 137 77, 337409, 337412, G05G 1700

Patent

active

041966368

ABSTRACT:
A control apparatus is disclosed for regulating the movement of a control stem which is biased in a given direction. The apparatus comprises a housing forming a chamber and a plurality of passages. The chamber receives the control stem in its direction of bias, the latter abutting against a restraining sphere disposed in the chamber. A pair of pistons are movably disposed in remaining ones of the passages to maintain the sphere in the chamber. The pistons are movable to allow the sphere to enter a passage so that the stem can move further into the chamber. The pistons can be moved manually or automatically, as by means of a fusible element which melts in response to the heat of a fire.

REFERENCES:
patent: 727205 (1903-05-01), Root et al.
patent: 2484940 (1949-10-01), Franzheim
patent: 2610614 (1952-09-01), Sedgwick
patent: 2702179 (1955-02-01), Grunt

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