Reduced pull chain drive for roll-up doors

Reduced pull chain drive for roll-up doors

A reduced pull chain hoist comprising a frame having a pair of bearings for receiving a hexagonal shaft, a chain guide, a chain pocket wheel for turning a chain and a spur gear. A conventional curtain roll-up door is operated by pulling the chain which turns the chain pocket wheel, shaft and spur ge...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: CURTIS DAVID B
Format: Patent
Sprache:eng
Schlagworte:
CAPSTANS
DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL
FIXED CONSTRUCTIONS
FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES,FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS,BLINDS, GATES
HAULING
HOISTING
HOISTS
LADDERS
LIFTING
PERFORMING OPERATIONS
TACKLES, e.g. PULLEY BLOCKS
TRANSPORTING
WINCHES
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Beschreibung
Zusammenfassung:A reduced pull chain hoist comprising a frame having a pair of bearings for receiving a hexagonal shaft, a chain guide, a chain pocket wheel for turning a chain and a spur gear. A conventional curtain roll-up door is operated by pulling the chain which turns the chain pocket wheel, shaft and spur gear. The spur gear engages a ring gear mounted to a drum assembly. As the spur gear turns the ring gear and drum assembly and causes the door to raise or lower.