Pressure controlled time switch

Details Pressure controlled time switch Pressure controlled time switch

1999-12-28

2001-04-10

Gellner, Michael L. (Department: 2832)

Electricity: circuit makers and breakers

Retarded

Chain or flexible drive

C200S034000

Reexamination Certificate

active

06215079

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention involves a time switch used for example for triggering off or terminating a procedure when relatively short switching times are preset, only mechanical energy sources are available, and so forth. A non-exclusive area of use lies in motion control for the transportation rollers of paper towel dispensers or the like.
2. Description of the Related Art
Examples in this respect are shown for example in U.S. Pat. No. 2 369 851, U.S. Pat. No. 2, 592,786. U.S. Pat. No. 2,930,664 or GB-A 2 043 592 and GB-A 2 096 099.
BRIEF SUMMARY OF THE INVENTION
The invention concerns a time switch having a switching member on which a suction cup is arranged, a counterpart body against which the suction cup can be pressed forming a reduced-pressure space, with air contained in the suction cup being displaced, an air inlet opening into the reduced-pressure space, the cross-section of the opening preferably being adjustable to establish the release time of the suction cup from the counterpart body, and a resetting device whose resetting force is less than the suction force of the suction cup when pressed against the counterpart body. A needle valve or the like which is provided with an adjusting screw is arranged in the continuously open air inlet opening for fixing the switching time, that is to say that time until the reduced pressure has returned to normal due to the intake of air, to such an extent that the return force of the time switch exceeds the suction force.
The intake of air can be altered by means of the adjusting screw, but that is not an appropriate course of action whenever the switching cycle is to experience a one-off acceleration effect and is then to continue to move at the intended setting.
In accordance with the invention associated with the reduced-pressure space is a venting opening with a sealing closure element which is urged in the closed position, so that it is possible to implement any reduction in the duration of the switching time by lifting off the closure element.
The reduced-pressure space thus has two openings, namely the air inlet opening which determines the predetermined switching time and the venting opening which permits the switching time to be reduced and the closure element of which is for example actuated by hand.
A preferred embodiment provides that the counterpart body is a fixed plate and the venting opening provided with the closure element is disposed in the counterpart body. A plate which is fixed with respect to the housing and which is not flexible improves the sealing contact of the closure element which is arranged in particular on a lever which is engaged on the one hand by a return spring and on the other hand by an actuating element which operates against the return spring.


REFERENCES:
patent: 2369851 (1945-02-01), Price
patent: 2592786 (1952-04-01), Birr
patent: 2939664 (1960-03-01), Liebisch
patent: 3081847 (1963-03-01), Smitley
patent: 3495342 (1970-02-01), Goldstein
patent: 4552999 (1985-11-01), Annas
patent: 5306957 (1994-04-01), Ellingham et al.
patent: 5410930 (1995-05-01), DeLuca et al.
patent: 28 41 144 A1 (1980-04-01), None
patent: 2 060 650 (1979-10-01), None
patent: 2043592 (1980-10-01), None
patent: 2096099 (1982-10-01), None
patent: 2146094 (1985-04-01), None

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