Patent
Chain pulling device
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TLDR
In this article, 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.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.read more
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Patent
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