Independent band spring door gear motor operator

Details Independent band spring door gear motor operator Independent band spring door gear motor operator

1989-10-05

1990-06-05

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

160133, E06B 908, E06B 972

Patent

active

049317083

ABSTRACT:
A power assist device for raising and lowering an independent band spring door is disclosed. The present invention includes a prime mover, an operator controlling the prime mover, a band spring cage, and a roller chain gear set mechanically connecting the operator to the band spring cage so that there is no back lash in the gear set.

REFERENCES:
patent: 2626375 (1953-01-01), Fischer
patent: 3853167 (1974-12-01), Wardlaw
patent: 4342354 (1982-08-01), Leivenzen et al.
patent: 4392392 (1983-07-01), Perisic et al.
patent: 4501963 (1985-02-01), Perisic
patent: 4665965 (1987-05-01), Pasquier et al.
patent: 4690195 (1987-09-01), Taylor
patent: 4706727 (1987-11-01), Leivenzon et al.
patent: 4721146 (1988-01-01), Wardlaw
patent: 4800946 (1989-01-01), Rosenoy

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