Tape drive closure operator

Details Tape drive closure operator Tape drive closure operator

1983-02-03

1985-06-04

Krizmanich, George H.

Machine element or mechanism

Mechanical movements

Reciprocating or oscillating to or from alternating rotary

474205, 226 76, F16H 2702, F16H 2902

Patent

active

045206848

ABSTRACT:
A closure operator such as a garage door operator utilizes an apertured flexible tape. The tape is enclosed in a guide and a drive sprocket has teeth engaging the apertures to apply both tension and compression forces to open and close a door. The apertures are enlarged in width and length and the tape has fewer apertures per-unit-length compared to the prior art tape. This decreases the stress per-unit-area in the tape at each tooth and increases the shear strength of the webs between successive apertures to be more nearly equal to the tensile strength of the tension band areas of the tape.

REFERENCES:
patent: 239114 (1881-03-01), Reese
patent: 2176517 (1939-10-01), Wittel
patent: 3252503 (1964-04-01), Jackson
patent: 3577794 (1971-05-01), Kerfoot
patent: 4026756 (1977-05-01), Stanfield et al.
patent: 4311225 (1982-01-01), Tsubaki et al.
patent: 4316567 (1982-02-01), Grear et al.
patent: 4412637 (1983-11-01), Berger
patent: 4414778 (1983-11-01), Carli

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