Deformable membrane keypad assembly for public telephones

Details Deformable membrane keypad assembly for public telephones Deformable membrane keypad assembly for public telephones

1987-09-04

1989-08-29

Ng, Jin F.

Telephonic communications

Supervisory or control line signaling

Substation originated

379437, 379451, 200 5A, H01H 332

Patent

active

048624993

ABSTRACT:
A telephone keypad assembly including a one-piece deformable membrane for sealing the keypad assembly from the environment. The deformable membrane has an upper surface for mating with keypad pushbuttons and a keypad pushbutton housing unit, and a lower surface including a contact actuator for making contact with electrical switch contacts. The membrane forms raised areas or domes which bias the keypad pushbuttons and biasingly resists movement of the contact actuator toward the electrical contacts. The keypad assembly including switch contacts is protected from moisture, dust and other corrosive elements by the seal formed between the housing unit and the deformable membrane.

REFERENCES:
patent: 4291201 (1981-09-01), Johnson et al.
patent: 4524249 (1985-06-01), Farrell
patent: 4609791 (1986-09-01), Abbat
patent: 4618744 (1986-10-01), Pope et al.
patent: 4636593 (1987-01-01), Norak et al.
patent: 4687200 (1987-08-01), Shirai
patent: 4710597 (1987-12-01), Loheac
patent: 4716262 (1987-12-01), Morse
patent: 4760217 (1988-07-01), Suzuki et al.

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