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US 2023/0340833 A1Published application
Compound spring bar
AssigneeMingyang Windeco Technology Corporation
InventorsNianqing ZHANG, Shehua WEI, Peilun QIAN
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Abstract
A compound spring bar includes a compound spring having one end fixed and the other end rotating as a curtain fabric opens and closes, where the compound spring includes at least two springs with different diameters, the springs are nested in layers according to their diameters, adjacent springs are connected in series, and all the springs form a combined spring; and free ends of an innermost spring and an outermost spring in the combined spring, which are not connected to other springs in series, are two ends of the combined spring. The
Claims7
A compound spring bar, comprising:
- a compound spring, the compound spring comprising:
- at least two springs including a first spring and a second spring, the first spring having a first diameter and the second spring having a second diameter, the first diameter being greater than the second diameter, wherein the first and second springs are nested in layers with the second spring nested within the first spring according to their diameters, the first and second springs are connected in series;
- a free end of the first spring constituting a first end of the compound spring;
- and
- a free end of the second spring constituting a second end of the compound spring,
- when the compound spring is connected to a curtain fabric to open and close the curtain, the first end of the compound spring is rotatable and the second end of the compound spring is fixed.
3 more elements
Dependencies are inferred from the claim text.