Electromechanical door operator

Details Electromechanical door operator Electromechanical door operator

1978-05-15

1980-09-02

Staab, Lawrence J.

Machine element or mechanism

Mechanical movements

Reciprocating or oscillating to or from alternating rotary

74 8917, 49137, 49264, 49274, 49334, 49336, E05F 1100, F16H 2702

Patent

active

042200512

ABSTRACT:
A door operator with a reciprocable rack gear adapted to be actuated in opposite directions by an electric motor driven screw and a coaxial helical compression spring for rotating a drive gear of a door operating spindle in opposite directions for opening and closing a swinging door, the rack gear forming part of a spindle operator having lateral bearings engageable with the ends of the spindle and adapted to be mounted in either of two 180.degree. angularly spaced positions about the axis of the drive screw for rotating the spindle in opposite directions, and the coaxial compression spring being operable via the rack gear for biasing the spindle in both directions to an intermediate position thereof.

REFERENCES:
patent: 212688 (1879-02-01), Hansell
patent: 1540707 (1925-06-01), Ormsbee
patent: 1594469 (1926-08-01), Schornack
patent: 2316528 (1943-04-01), Miles
patent: 2782832 (1957-02-01), Shaw
patent: 3039764 (1962-06-01), Heinsman et al.
patent: 3087720 (1963-04-01), Catlett
patent: 3602342 (1971-08-01), Whittle

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