Venetian blind
AssigneeTaicang Kingfu Plastic Manufacture Co., Ltd.
InventorSzu-Chang Huang
Life of this patent
Estimating the term…
Abstract
A venetian blind includes a frame unit, a slat unit, a transmission unit, and an operating unit. The slat unit includes multiple drive axles and a plurality of slats each connected co-rotatably to the drive axles. The transmission unit includes two transmission rollers, a plurality of constant-force coil springs that are linked together and that are coupled to the drive axles, and a belt that cooperates with the constant-force coil springs to form a loop trained on the transmission rollers. The operating unit includes an inner control member connected to the belt, and an outer control member operable to drive the inner control member to move so as to drive rotation of the drive axles via the constant-force coil springs to rotate the slats.
Claims14
A venetian blind comprising:
- a frame unit;
- a slat unit including a plurality of spaced-apart axle sets arranged in a first direction, each of said axle sets including two drive axles that are aligned with each other and that are rotatably connected to said frame unit, said slat unit further including a plurality of slats, each of said slats being connected co-rotatably between said drive axles of a respective one of said axle sets;
- a transmission unit including
- two transmission rollers that are connected rotatably to said frame unit, and that are disposed respectively at opposite sides of said slat unit in the first direction,
- a plurality of constant-force coil springs that are disposed between said transmission rollers, that are arranged in the first direction and that are linked together, one of said drive axles of each of said axle sets being coupled co-rotatably to a respective one of said constant-force coil springs, and
- a belt that is connected to said constant-force coil springs, and that cooperates with said constant-force coil springs to form a loop trained on said transmission rollers such that, for each of said slats, a restoring force of a respective one of said constant-force coil springs exerted thereon which drives said slat to rotate in a first rotational direction substantially counteracts a force of gravity exerted thereon which prevents said slat to rotate in the first rotational direction;
- and
- an operating unit including
- an inner control member that is disposed in said frame unit and that is connected to said belt, and
- an outer control member that is disposed outside of said frame unit, and that is operable to drive said inner control member to move so as to drive rotation of said drive axles via said constant-force coil springs to rotate said slats.
Dependencies are inferred from the claim text.