Timing apparatus

Details Timing apparatus Timing apparatus

1981-09-01

1984-01-17

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

34030915, 340322, 340328, 340384R, 3408153, 307141, 49 30, G08B 2300, E05F 1520

Patent

active

044266391

ABSTRACT:
A timing apparatus for holding a door open for a controlled period of time before releasing it for closure. The timing apparatus includes a switch operable to produce a switching signal. A first energizing control is coupled to the switch and is responsive to the switching signal for producing a first signal. An electromagnetic device is coupled to the first energizing control and is energizable in response to the first signal. A first timing circuit is coupled to the first energizing control and is responsive to the first signal to generate a first timing signal of predetermined duration and corresponding to the switching signal. The first energizing control is further responsive to the first timing signal thereby to remain in the state of providing the first signal for such predetermined duration. A second timing circuit is coupled to the first timing circuit and is responsive to the termination of the first timing signal to produce a second timing signal of second predetermined duration. A second energizing control is coupled between the second timing circuit and the electromagnetic device and is responsive to the second timing signal for retaining the electromagnetic device energized for the second predetermined duration.

REFERENCES:
patent: 4206448 (1980-06-01), Davis
patent: 4250496 (1981-02-01), Southgate
patent: 4337460 (1982-06-01), Smith et al.

Affiliated with

Also associated with

Rating

Timing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Timing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Timing apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-702592