Patent ID: 7654300

Claim:
A solar radiation shielding apparatus including an obstacle detection stopping device for stopping an extension of a solar radiation shielding member after an obstacle contacts said solar radiation shielding member, the apparatus comprising: a rotatable winding pulley; a supporting member rotatably supporting said winding pulley; a lifting cord supported by said winding pulley; said solar radiation shielding member supported by said lifting cord; a rotatable driving shaft selectively rotatably driving said winding pulley in a rolling-up direction of the lifting cord to retract said solar radiation shielding member, said winding pulley being rotatable in an unwinding direction of the lifting cord by a tension exerted on said lifting cord to extend said solar radiation shielding member; and said obstacle detection stopping device which includes: an obstacle detector frictionally engaging said winding pulley and adapted to stop rotation of said driving pulley after the tension exerted on said lifting cord is interrupted; and a stop operably engageable with said driving shaft and adapted to stop rotation of said driving shaft relative to said winding pulley which is stopped by said obstacle detector; said stop comprising: a clutch which is selectively movable in a direction of the axis line of said winding pulley; a rotary drum which is fixed against movement in the direction of the axis line of said winding pulley and is rotatable with the driving shaft; and a braking projected part formed on said supporting member so as to be engageable with said clutch, wherein said clutch is inserted into a penetrating hole formed in said supporting member so that a cylinder portion formed at an edge of said clutch is relatively rotatable and movable in the direction of the axis line, and obstructs the rotation of said driving shaft by letting the rotation of the rotary drum stop in response to becoming impossible to rotate, by moving in the direction of the axis line of said winding pulley according to rotation of said driving shaft relative to said winding pulley and engaging with said braking projected part of said supporting member.