Electricity: circuit makers and breakers – Retarded – Clock train
Reexamination Certificate
2000-03-02
2001-08-14
Scott, J. R. (Department: 2832)
Electricity: circuit makers and breakers
Retarded
Clock train
C200S0380DA, C200S0380FB
Reexamination Certificate
active
06274827
ABSTRACT:
BACKGROUND
In a manual timer switching device, which incorporates an electromechanical timer switch, it is desirable to change the control state manually independently of the programmer keeping the time. Also, it is desirable to have a way of manually changing the control state expediently, on the front face of the timer switching device.
DE-GM 88 02 081.9, for instance, discloses a program-controlled and a manually actuable timer switching device. The manual timer switching device has a rotating knob arranged on the front face, in one of the housing comer regions, outside its rotating program carrier, which has the programmable switch actuators. In this arrangement, the rotating knob, for manually actuating the timer switch, has a relatively small outside diameter and is not clearly placed on the front face of thereof.
DE-GM 89 01 269.0 also discloses a manually actuable timer switching device having a bolt-shaped actuating element arranged inside an arc shaped trough formed in the program carrier. The actuating element is constructed with an outside diameter that is ergonomically small and arranged relatively in tight proximity to the programmable switch actuators on the program carrier, in a fashion that is difficult to operate.
SUMMARY OF THE INVENTION
The present invention relates to a manual timer switch device having a rotatable knob that can eliminate the disadvantages of the known devices for changing control state. The manual timer switch according to the present invention can provide a relatively larger knob the front face of the timer switching device in relation to a rotatable program carrier.
According to the invention, the manual switching device has a housing, a program carrier, and a manually rotatable knob. The housing contains a timer switch. The program carrier rotatably mounted to a front face side of the housing, concentric with the housing. The manually rotatable knob is seated coaxially with the program carrier and is mechanically connected to the timer switch. The program carrier is rotatable independently of the knob and has program actuators adapted to actuate the timer switch. The manually rotatable knob has a single ended, bar-shaped operating handle on a front face thereof.
The program carrier is annular, having a central opening through which the knob is coaxially situated with the program carrier. The knob is mechanically connected to the timer switch to actuate the timer switch via a plurality of levers comprising first, second, third, and fourth levers.
The program carrier has a plurality of radially extending slots through which the program actuators are slideably movable. Each actuator is movable within the confines of one of the slot between a first position and a second position. Each of the program actuators is adapted to drive the third lever when the program actuator is in the second position as the program carrier is being rotated.
The knob is rotatable between a first position where a manual operation of the timer switch is turned OFF, a second position where time controlled operation by the program actuator is turned OFF, a third position where the program actuator is adapted to actuate the timer switch, and a fourth position where the knob manually actuates the timer switch.
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patent: 3925629 (1975-12-01), Albinger, Jr.
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patent: 4360739 (1982-11-01), Goldstein
patent: 4558192 (1985-12-01), Thoma
patent: 4823329 (1989-04-01), Schwer et al.
patent: 4829279 (1989-05-01), Kicherer et al.
patent: 5083477 (1992-01-01), Geil
patent: 5558796 (1996-09-01), Cho
patent: 5711415 (1998-01-01), Fukuda et al.
patent: 89 02 081 U (1988-06-01), None
patent: 89 01 269 U (1989-06-01), None
patent: 2027998 (1980-02-01), None
Foley & Lardner
Scott J. R.
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