Movable or removable closures – With operator for movably mounted closure – Operator drives closure along guide
Patent
1988-05-02
1989-04-18
Kannan, Philip C.
Movable or removable closures
With operator for movably mounted closure
Operator drives closure along guide
744248R, 74 8915, 49199, E05F 1134
Patent
active
048214566
ABSTRACT:
A linear mechanical drive with precise end of travel load positioning includes a drive shaft having a threaded portion intermediate two non-threaded portions, reversible motor drive turning the shaft, a load carrier element threaded on the shaft for pulling the load along the shaft, the carrier disengaging at the non-threaded portions thereby to precisely determine the end position of the carrier irrespective of continued drive shaft rotation. The carrier reengages to the threaded portion upon reversal of drive shaft rotation, and a load connector on the carrier element is adjustable for precisely positioning the load at one or both of the end of travel positions. Other features disclosed protect the drive against excessive mechanical wear and disengage the load from the carrier element for strain relief.
REFERENCES:
patent: 1139905 (1915-05-01), Pitts
patent: 2951390 (1960-09-01), Martens et al.
patent: 3533298 (1970-10-01), Gerber
patent: 3996697 (1976-12-01), Bailey et al.
patent: 4107877 (1978-08-01), Lee
patent: 4121636 (1978-10-01), James
patent: 4147073 (1979-04-01), Mercier
patent: 4310144 (1982-01-01), Nogaki
Epstein Natan
Kannan Philip C.
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