Progressive resistance lifting mechanism for a window covering
First Claim
1. A window covering assembly capable of maintaining a selected position without requiring manipulation of cords, buttons or other locking mechanisms, the window covering assembly comprising in combination:
- a window covering;
a top rail at an upper end of said window covering, said top rail adapted to be attached to a casing adjacent a window;
a bottom rail at a lower end of said window covering;
a cord;
a cord collector, said cord collector coupled to one of said rails;
said cord extending between said cord collector and one of said rails spaced from said cord collector;
a biaser coupled to said cord collector, said biaser adapted to bias said cord collector toward having more cord collected with said cord collector;
a progressive resister coupled to said cord collector;
said progressive resister adapted to provide greater resistance to motion of said bottom rail and cord collection by said cord collector when said bottom rail is in a first lower position than when said bottom rail is in a second higher position above said first lower position; and
said cord collector adapted to rotate, said progressive resister including a threaded shaft coupled to said cord collector and adapted to rotate with said cord collector, said progressive resister including a key with a threaded hole adapted to ride along said threaded shaft, said key adapted to add resistance to cord collector rotation when said cord collector rotates to a position with less cord collected thereon.
1 Assignment
0 Petitions
Accused Products
Abstract
A lifting mechanism is provided for a window covering which allows a bottom rail of the window covering to maintain a static position unless raised or lowered by a user. The lifting mechanism is included within either a top or bottom rail of the window covering. The lifting mechanism includes cords which pass from a rail including the lifting mechanism to a rail not including the lifting mechanism and about cord redirectors located within the rail including the lifting mechanism. The lifting mechanism includes spools and associated springs for gathering excess portions of the cord thereon. A progressive resister is coupled to the spools with the progressive resister providing different amounts of resistance to spool rotation depending on the amount of cord upon each spool.
102 Citations
44 Claims
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1. A window covering assembly capable of maintaining a selected position without requiring manipulation of cords, buttons or other locking mechanisms, the window covering assembly comprising in combination:
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a window covering; a top rail at an upper end of said window covering, said top rail adapted to be attached to a casing adjacent a window; a bottom rail at a lower end of said window covering; a cord; a cord collector, said cord collector coupled to one of said rails; said cord extending between said cord collector and one of said rails spaced from said cord collector; a biaser coupled to said cord collector, said biaser adapted to bias said cord collector toward having more cord collected with said cord collector; a progressive resister coupled to said cord collector; said progressive resister adapted to provide greater resistance to motion of said bottom rail and cord collection by said cord collector when said bottom rail is in a first lower position than when said bottom rail is in a second higher position above said first lower position; and said cord collector adapted to rotate, said progressive resister including a threaded shaft coupled to said cord collector and adapted to rotate with said cord collector, said progressive resister including a key with a threaded hole adapted to ride along said threaded shaft, said key adapted to add resistance to cord collector rotation when said cord collector rotates to a position with less cord collected thereon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A movable light occluding structure for a window, the structure comprising in combination:
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a window covering; a top rail at an upper end of said window covering, said top rail adapted to be attached to a casing adjacent a window; a bottom rail at a lower end of said window covering; a cord; a cord collector, said cord collector coupled to one of said rails; said cord extending between said cord collector and one of said rails spaced from said cord collector; a biaser coupled to said cord collector, said biaser adapted to bias said cord collector toward having more cord collected with said cord collector; a progressive resister coupled to said cord collector; said progressive resister adapted to provide progressively greater resistance to motion by said cord collector when a progressively greater amount of cord is off of said cord collector; wherein said cord collector is adapted to rotate, said progressive resister adapted to provide resistance to rotation of said cord collector; and wherein said progressive resister includes a brake which exerts progressively greater braking force when progressively greater amounts of cord are off of said cord collector. - View Dependent Claims (27, 28)
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29. A movable light occluding structure for a window, the structure comprising in combination:
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a window covering; a top rail at an upper end of said window covering, said top rail adapted to be attached to a casing adjacent a window; a bottom rail at a lower end of said window covering; a cord; a cord collector, said cord collector coupled to one of said rails; said cord extending between said cord collector and one of said rails spaced from said cord collector; a biaser coupled to said cord collector, said biaser adapted to bias said cord collector toward having more cord collected with said cord collector; a progressive resister coupled to said cord collector; said progressive resister adapted to provide progressively greater resistance to motion by said cord collector when a progressively greater amount of cord is off of said cord collector; and wherein said progressive resister includes a brake which exerts progressively greater braking force when progressively greater amounts of cord are off of said spool. - View Dependent Claims (30, 31, 32, 33)
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34. A window covering assembly, comprising in combination:
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a window covering; a top rail at an upper end of said window covering, said top rail adapted to be attached to a casing adjacent a window; a bottom rail at a lower end of said window covering; a cord; a cord collector, said cord collector coupled to one of said rails; said cord extending between said cord collector and one of said rails spaced from said cord collector; a spring coupled to said cord collector, said spring adapted to bias said cord collector toward having more cord collected with said cord collector; a progressive resister coupled to said cord collector; said progressive resister adapted to provide more resistance to motion by said cord collector when a lesser amount of cord is collected by said cord collector than when a greater amount of cord is collected by said cord collector; and a cord tensioner adjacent said cord, said cord tensioner adapted to maintain tension of said cord adjacent said cord collector. - View Dependent Claims (35, 36, 37, 38)
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39. A window covering assembly, comprising in combination:
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a window covering; a top rail at an upper end of said window covering, said top rail adapted to be attached to a casing adjacent a window; a bottom rail at a lower end of said window covering; a cord; a cord collector, said cord collector coupled to one of said rails; said cord extending between said cord collector and one of said rails spaced from said cord collector; a spring coupled to said cord collector, said spring adapted to bias said cord collector toward having more cord collected with said cord collector; a progressive resister coupled to said cord collector; said progressive resister adapted to provide more resistance to motion by said cord collector when a lesser amount of cord is collected by said cord collector than when a greater amount of cord is collected by said cord collector; and wherein a cord tensioner is located adjacent a pulley, said cord tensioner adapted to maintain tension of said cord between said pulley and said cord collector. - View Dependent Claims (40)
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41. A window covering apparatus, comprising in combination:
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a window covering; a top rail at an upper end of said window covering, said top rail including means to attach said top rail to a casing adjacent the window; a bottom rail at a lower end of said window covering; a cord; a means to collect cord coupled to one of said rails; said cord extending between said cord collecting means and one of said rails spaced from said cord collecting means; a means to bias said cord collecting means toward having more cord collected with said cord collecting means; a progressive resister coupled to said cord collecting means; said progressive resister including means to provide progressively greater resistance to motion by said cord collecting means when a progressively greater amount of said cord is off of said cord collecting means; and said means to provide progressively greater resistance includes a brake adapted to exert a progressively greater braking force at least indirectly upon said collecting means to resist further collection of cord a progressively greater amount as progressively more cord is off of said cord collecting means. - View Dependent Claims (42, 43)
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44. A window covering apparatus comprising in combination:
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a window covering; a top rail at an upper end of said window covering, said top rail including means to attach said top rail to a casing adjacent the window; a bottom rail at a lower end of said window covering; a cord; a means to collect cord coupled to one of said rails; said cord extending between said cord collecting means and one of said rails spaced from said cord collecting means; a means to bias said cord collecting means toward having more cord collected with said cord collecting means; a progressive resister coupled to said cord collecting means; said progressive resister including means to provide progressively greater resistance to motion by said cord collecting means when a progressively greater amount of said cord is off of said cord collecting means; and wherein said means to provide progressively greater resistance includes a brake which exerts progressively greater braking force at least indirectly upon said spool to resist further rotation of said spool a progressively greater amount as progressively more of said cord is off of said spool.
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Specification