Brake device for cordless lift shades
First Claim
Patent Images
1. A covering for an architectural opening comprising:
- a first rail;
a second rail moveable relative to the first rail; and
a lift assembly coupled to the first rail;
the lift assembly including;
a drum having a hub, the drum rotatable about an axis;
a cord coupled to the drum; and
a brake movable relative to the drum;
wherein the cord biases the brake toward the drum and into engagement with the hub to resist the second rail moving away from the first rail.
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Abstract
A covering for an architectural opening including a first rail, a second rail moveable relative to the first rail, and a lift assembly coupled to the first rail. The lift assembly includes a drum rotatable about an axis, and a brake selectively engageable with the drum. The brake automatically engages the drum to resist the second rail moving away from the first rail; and the brake automatically disengages the drum in response to the second rail moving toward the first rail.
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Citations
20 Claims
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1. A covering for an architectural opening comprising:
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a first rail; a second rail moveable relative to the first rail; and a lift assembly coupled to the first rail;
the lift assembly including;a drum having a hub, the drum rotatable about an axis; a cord coupled to the drum; and a brake movable relative to the drum; wherein the cord biases the brake toward the drum and into engagement with the hub to resist the second rail moving away from the first rail. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A cradle assembly for an architectural opening covering, the cradle assembly comprising:
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a cradle; a drum supported within the cradle and rotatable about an axis; a cord coupled to the drum; and a cover pivotally coupled to the cradle; wherein the cord biases the cover to pivot toward the drum and apply a braking force that inhibits rotation of the drum. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A covering for an architectural opening comprising:
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a head rail; a bottom rail moveable relative to the head rail; and a lift assembly coupled to the head rail, the lift assembly including; a spring motor; a drive shaft coupled to the spring motor and defining a rotational axis; a cradle rotatably supporting a drum about the rotational axis; a cord coupled between the drum and the bottom rail; and a cover movably coupled to the cradle; wherein in response to the bottom rail moving away from the head rail, the cord biases the cover to move toward the drum and increase a braking force that inhibits rotation of the drum, and wherein in response to the bottom rail moving toward the first rail the braking force is reduced.
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Specification