Patent ID: 9151109
Filing Date: 2015-10-06
Classification: E06B

Abstract:
1. An operation pulley capable of being assembled in an operation apparatus of a sunlight shielding apparatus, comprising: a tubular pulley; a ball chain configured to be mounted on the pulley; and a gear shaft or transmission shaft configured to engage with the pulley, wherein the ball chain is coupled via a coupling section into an endless type, the coupling section being configured to be decoupled with a first force which is a predetermined force, the pulley is provided, on an outer peripheral surface thereof, with a number of concavities configured to engage with balls of the ball chain, and, in an inward direction on an end surface of an input side, a flange formed integrally with the outer peripheral surface so as to be tubular toward an output side, and is engaged, at an opening on the output side, with the gear shaft or the transmission shaft so as to be capable of rotating relative to each other with friction, a slippage torque of a torque limiter provided between the pulley and the gear shaft or the transmission shaft is smaller than a first rotation torque exerted on the pulley with the first pull force, and the pulley is engaged with the gear shaft or the transmission shaft so that the pulley and the gear shaft or the transmission shaft rotate together when the torque applied to the pulley is below the slippage torque, and the pulley rotates relative to the gear shaft or the transmission shaft when the torque applied to the pulley is above the slippage torque.