Replacement elevator call button assembly

Details Replacement elevator call button assembly Replacement elevator call button assembly

1977-03-11

1979-01-09

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Ultrasonic pest control

200314, 315129, 315136, 340 19R, 340332, G06F 1900, B66B 302

Patent

active

041341074

ABSTRACT:
A direct replacement unit for an elevator touch button of the type which uses a voltage dropping gas tube. The replacement unit includes a series circuit, containing a relay coil, a zener diode, an indicator lamp, and a parallel circuit. The parallel circuit includes a normally open contact switch controlled by the relay coil and a mechanical call button.

REFERENCES:
patent: 2738489 (1956-03-01), Borden
patent: 3493922 (1970-02-01), Laas
patent: 3509420 (1970-04-01), Ogle
patent: 3624484 (1971-11-01), Colyer
patent: 3783975 (1974-01-01), Lingegger
patent: 3952837 (1976-04-01), Rice
patent: 4029991 (1977-06-01), Schultz

Affiliated with

Also associated with

Rating

Replacement elevator call button assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1790840