Chain pulling device

Details Chain pulling device Chain pulling device

1991-02-19

1992-08-11

Johnson, Blair M.

Flexible or portable closure, partition, or panel

Roll type

With rotating means

160319, 1603231, 475331, E06B 956

Patent

active

051370735

ABSTRACT:
A pulling device for a roll shaft for roller blinds or screens comprises a housing, a chain pulley situated in the housing and a chain slung around the pulley. The chain is formed by a cord with a number of beads distributed at regular interval along the length. The pulley is provided with a central channel and a series of notches at the periphery to receive the cord portion and the beads of the chain, respectively. The chain is readily pulled to drive the pulley and, in turn, the roller shaft, to wind up or to unwind a roller blind or screen. When the pulling force is released the pulley will be automatically braked by means of the chain itself by the gravity of the roller blind or screen.

REFERENCES:
patent: 4139044 (1979-02-01), Brolin
patent: 4448233 (1984-05-01), Rombouts
patent: 4513805 (1985-04-01), Mase
patent: 4657060 (1987-04-01), Kaucic
patent: 4681279 (1987-07-01), Nakamura
patent: 4712599 (1987-12-01), Komaki
patent: 4830081 (1989-05-01), Morris

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