Flexible or portable closure – partition – or panel – Roll type – With brake or stop
Patent
1994-09-26
1996-08-06
Purol, David M.
Flexible or portable closure, partition, or panel
Roll type
With brake or stop
160321, E06B 956
Patent
active
055424643
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to improvements in a roll blind in which tile screen is pulled down by hand and rolled up by a wind-up spring.
BACKGROUND OF THE INVENTION
JP Y S63-41516 and JP Y H1-26871 disclose a roll blind in which the screen is pulled down by hand and rolled up by a winding spring. The roll blind comprises a tube for rolling up the screen thereon, a fixed shaft for rotatably supporting one end portion of the tube, a wind-up spring interposed between the tube and the Fixed shaft, a clutch brake interposed between the tube and the fixed shaft for selectively rotating the tube. The screen is usually provided at its free end with a weight bar. The clutch brake allows the tube to roll down the screen therefrom, when the weight bar is pulled down. The clutch brake prevents the tube from rolling the screen down therefrom and up thereon, when the weight bar is released after being substantially lowered. However, the clutch brake again allows the tube to be rotated by the wind-up spring in the direction in which the screen is rolled up on the tube, when the weight bar is released after being slightly lowered. While the screen is rolled up by the winding spring, its speed can be reduced by the use of a reduction mechanism interposed between the tube and the fixed shaft. The clutch brake as described above is disclosed by JP B S63-34950. The aforementioned reduction mechanism is disclosed by JP Y H1-26871.
When the roll blind is mounted in a tall window which extend from a floor to a ceiling, the weight bar is usually provided with a pulling string. The string enables one to operate the roll blind even if the screen is rolled up at a high position beyond one's reach. However, when the screen is lowered near the full length of the floor, the string inconveniently lies on tile floor.
The present invention is intended to solve the problem as described above by providing a corded roll blind in which a pulling string is eliminated from the weight bar.
SUMMARY OF THE INVENTION
The present invention included in a roll blind comprising a tube for rolling up a screen thereon, a fixed shaft for rotatably supporting one end portion of the tube, a clutch brake interposed between the tube and the fixed shaft for selectively rotating the tube, a wind-up spring interposed between the tube and the fixed shaft for rotating the tube in the direction in which the screen is rolled up on the tube, a rotary shaft connected with the tube for rotation therewith and projecting therefrom, a pair of brackets for supporting the fixed and rotary shafts, a pulley drivingly engaged with the rotary shaft for rotating the tube, an endless pulling member drivingly engaged with the pulley and hung therefrom to a manually operatable position. The pulling member is arranged to rotate the tube in the direction in which tile screen is lowered through the intermediary of the pulley. The combination of the pulling member with tile pulley may be a cord with a cord wheel, a belt with a belt pulley, a rope with a rope wheel, or a ball chain with a ball chain wheel.
In the case of tile pulley integrally formed with the tube, the clutch brake will bear an undesirable force when the pulling member is drawn by mistake in the direction in which the screen is rolled up on the tube. Accordingly, it is preferable to provide a one-way clutch device between the tube and the pulley in a manner such that no torque acts on the clutch brake when the pulling member is drawn in the counter direction. The one-way clutch device can be a sprag, ratchet, cam, or coil-spring type.
The blind would have the pulley secured to the tube without the one-way clutch device, if it can be made known to everyone without exception that the pulling member must be drawn in tile direction in which the screen is lowered. The clutch brake should bear the undesirable torque to prevent the tube from rotating when the pulling member is drawn in the counter direction by mistake.
When the weight bar or endless pulling member is drawn down in the direction in wh
REFERENCES:
patent: 4188992 (1980-02-01), Segerljung
patent: 4372432 (1983-02-01), Waine et al.
patent: 4751953 (1988-06-01), Appel et al.
patent: 4779662 (1988-10-01), Wilk
patent: 4865109 (1989-09-01), Sherman
patent: 5167269 (1992-12-01), Abo
Purol David M.
Toso Company, Limited
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