Door operator

Details Door operator Door operator

1974-10-24

1976-09-21

Scott, Samuel

Machine element or mechanism

Mechanical movements

Rotary to or from reciprocating or oscillating

49 28, 49362, F16H 2150

Patent

active

039812030

ABSTRACT:
A door operator includes a threadless drive shaft, a carriage mounting skewed rollers engaging the drive shaft to move the carriage along the shaft upon shaft rotation, a drive motor having a shaft coaxial with the threadless shaft and a helical coupling connecting the shafts together. The coupling comprising a plurality of closely spaced helical convolutions with the end of the coupling secured to the motor shaft and the drive shaft, respectively. The coupling includes means for decreasing the shear stresses imposed on the end portions of the convolutions.

REFERENCES:
patent: 2841018 (1958-07-01), Dickson
patent: 2883182 (1959-04-01), Bornemann
patent: 2951390 (1960-09-01), Martens et al.
patent: 3608612 (1971-09-01), Demberton
patent: R27711 (1973-07-01), Steibel

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