Tension device for looped-cord system
AssigneeWhole Space Industries LTD
InventorTzong-Fu Lin
Life of this patent
Estimating the term…
Abstract
A tension device for a corded-loop drive system has a base with a sprocket on the base such that the cord loop travels over the sprocket. At least one resilient finger has a first end attached to the base and a free end. Each finger is sized and positioned to engage the cord loop when the tension device is not properly mounted to a wall or window frame and prevent movement of the cord loop around the sprocket. There is a hole in the finger through which a screw passes. When the base is placed on a mounting surface and the screw is driven into the mounting surface, the free end of the finger will have moved from the first position to a second position away from the cord so that the cord loop may move around the sprocket and the window covering can be fully raised and fully lowered.
Claims16
A tension device for a loop drive system having a beaded cord loop comprising:
- a base;
- a sprocket around which the beaded cord loop travels;
- at least one resilient finger positioned adjacent the sprocket, the finger having a first end attached to the base, and a free end opposite the base, the finger sized and positioned so that the free end will engage at least one of the sprocket and a selected bead of the beaded cord loop when the finger is in a first position and prevent movement of the cord loop around the sprocket, the finger having a hole;
- and
- a fastener passing through the hole in the at least one resilient finger;
- wherein when the base is placed on a mounting surface and the fastener is driven into the mounting surface, the free end of the finger will have moved from the first position to a second position at which the free end of the finger does not engage the sprocket or the beaded cord loop, and the cord loop may move around the sprocket.
A loop drive for a window covering comprising
- a drive unit having a drive sprocket;
- a beaded cord loop on the drive sprocket, and
- a tension device comprised of:
- a base;
- a sprocket around which the beaded cord loop travels;
- at least one resilient finger positioned adjacent the sprocket, the finger having a first end attached to the base, and a free end opposite the base, the finger sized and positioned so that the free end will engage at least one of the sprocket and a selected bead of the beaded cord loop when the finger is in a first position and prevent movement of the cord loop around the sprocket, the finger having a hole;
- and
- a fastener passing through the hole in the at least one finger;
- wherein when the base is placed on a mounting surface and the fastener is driven into the mounting surface, the free end of the finger will have moved from the first position to a second position.
A tension device for a loop drive system having a comprising:
- a base;
- a sprocket around which a cord loop travels;
- at least one resilient finger positioned adjacent the sprocket, the finger having a first end attached to the base, and a free end opposite the end attached to the base which free end is movable between a first position and a second position, the finger sized and positioned so that the free end will engage at least one of the sprocket and a selected portion of the cord loop when the free end of the finger is in a first position and prevent movement of the cord loop around the sprocket and the free end will not engage the sprocket or the cord loop when the free end of the finger is in the second position, the finger having a hole;
- and
- a fastener passing through the hole in the at least one resilient finger;
- wherein when the base is placed on a mounting surface and the fastener is driven into the mounting surface, the free end of the finger will have moved from the first position to a second position.
A loop drive for a window covering comprising
- a drive unit having a drive sprocket;
- a cord loop on the drive sprocket, and
- a tension device comprised of:
- a base;
- a sprocket around which a cord loop travels;
- at least one resilient finger positioned adjacent the sprocket, the finger having a first end attached to the base, and a free end opposite the end attached to the base which free end is movable between a first position and a second position, the finger sized and positioned so that the free end will engage at least one of the sprocket and a selected portion of the cord loop when the free end of the finger is in a first position and prevent movement of the cord loop around the sprocket and the free end will not engage the sprocket or the cord loop when the free end of the finger is in the second position, the finger having a hole;
- and
- a fastener passing through the hole in the at least one resilient finger;
- wherein when the base is placed on a mounting surface and the fastener is driven into the mounting surface, the free end of the finger will have moved from the first position to a second position.
Dependencies are inferred from the claim text.