Composite spring bar

Abstract

The present application provides a kind of composite spring stick, including one end fixed, the other end rotates with the unwinding and closing of curtain fabric composite spring, wherein the composite spring includes at least two springs with different diameters, all springs are arranged according to the size of diameter layer by layer nesting, adjacent springs are connected in series, and all springs form a combined spring;The free end of the innermost spring in the combined spring and the outermost spring without being connected in series with other springs is respectively the two ends of the combined spring.The composite spring stick of the present application adopts a multi-spring structure, compared with the existing spring stick in the market, under the same effect, the spring length is shortened by half.Under the same torsion condition, the torsion of the composite spring stick increases less with each additional turn compared with the existing spring stick in the market, which solves the problem of poor force difference in curtain winding and complete unfolding.

Description

Technical Field

[0001] This invention belongs to the field of curtains, specifically relating to a composite spring rod. Background Technology

[0002] Currently, pull-free Venetian (honeycomb) blinds on the market use a constant force spring system. Pull-free roller blinds primarily use a torsion spring rod system, where the fabric tube drives the spring to twist, generating torque. The spring rod has requirements on spring length, so it cannot be used for blinds with narrow widths. The torque difference between when the roller blind is rolled up and when it is fully extended is significant, requiring additional weight to compensate for the force difference. In some spring rod structures, when the blind is pulled down quickly, the spring extends rapidly, but its structure cannot quickly release the extended force, easily causing spring deformation and damage. Summary of the Invention

[0003] This invention provides a composite spring rod.

[0004] The object of the present invention is achieved in the following manner: a composite spring rod, comprising a composite spring with one end fixed and the other end rotating as the curtain is opened and closed, wherein the composite spring comprises at least two springs with different diameters, all springs are nested in layers according to their diameters, adjacent springs are connected in series, and all springs form a combined spring; the free ends of the innermost spring and the outermost spring that are not connected in series with other springs are the two ends of the combined spring.

[0005] It also includes a retractable tube connected to the upper end of the curtain fabric that can rotate as the curtain is opened and closed. The retractable tube is sleeved on the outermost spring of the combined spring and fixed to the free end of the outermost spring. The support tube passes through the innermost spring of the combined spring, and the free end of the innermost spring of the combined spring is fixed.

[0006] The composite spring includes a large spring and a small spring, with the small spring disposed inside the large spring; both ends of the large spring are fixed to a large connector and a conversion connector, respectively; the large connector is fixed to the closing tube; the conversion connector can rotate and slide on the support tube; one end of the small spring is fixed to the conversion connector, and the other end is fixedly connected to the small connector; the small connector is fixed to the curtain's head or tail, or to the track or wall.

[0007] The innermost spring of the combined spring passes through a connecting rod that rotates as the curtains are opened and closed. The free end of the innermost spring is fixed to the connecting rod, and the free end of the outermost spring is fixed.

[0008] The composite spring includes a large spring and a small spring, with the small spring disposed inside the large spring; both ends of the large spring are fixed to a large connector and a conversion connector, respectively; the large connector is fixed to the curtain retractor tube or track, and the conversion connector can rotate and slide on the connecting rod; one end of the small spring is fixed to the conversion connector, and the other end is fixed to the connecting rod.

[0009] The adapter includes a large cylinder and a small cylinder arranged concentrically, and the outer surfaces of the large cylinder and the small cylinder are respectively provided with helical grooves to accommodate the large spring and the small spring; the large connector and the small connector are also provided with helical grooves corresponding to the large spring and the small spring respectively.

[0010] Compared to existing technologies, the composite spring rod of this invention employs a multi-spring structure, with a larger diameter spring encased around a smaller diameter spring. Compared to existing spring rods on the market, the spring length is halved for the same performance. This saves space, allowing for the production of curtains with narrower widths, conserving materials, and reducing manufacturing costs. Under the same torque conditions, the composite spring rod exhibits a smaller torque increase with each additional rotation, resolving the issue of a large force difference between curtain rolling and full unfolding. During spring torsion, the spring's extension direction is at one end of the adapter joint. During extension, the adapter joint slides along the support tube or connecting rod, resulting in low frictional resistance. When the spring extends rapidly, the low resistance allows for quick release of the extension force, thus protecting the spring and extending the lifespan of the spring rod. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention.

[0012] Figure 2 yes Figure 1 Exploded view.

[0013] Figure 3 This is an exploded view of Example 1 of the curtainless design.

[0014] Figure 4 This is a schematic diagram of Embodiment 2 of the present invention.

[0015] Figure 5 yes Figure 4 Enlarged view of the composite spring section.

[0016] Figure 6 yes Figure 5 Exploded view.

[0017] Figure 7 This is an exploded view of Example 2, which features a curtain without drawers.

[0018] Among them, 1 is the curtain fabric, 2 is the composite spring, 20 is the large spring, 21 is the small spring, 22 is the conversion joint, 23 is the large joint, 24 is the small joint, 3 is the support tube, 4 is the retraction tube, 5 is the connecting rod, 6 is the track, 7 is the lower beam, 8 is the upper rail, 9 is the lower rail, 10 is the trolley, 11 is the micro-adjustment head, and 12 is the tail control. Detailed Implementation

[0019] In this invention, unless otherwise expressly specified and limited, the technical terms used in this application shall have the ordinary meaning understood by those skilled in the art. Terms such as “connected,” “linked,” “fixed,” and “set” shall be interpreted broadly, referring to fixed connections, detachable connections, or integral connections; direct connections or indirect connections via an intermediate medium; mechanical connections or electrical connections. Unless otherwise expressly specified and limited, “above” or “below” a second feature may mean that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, “above,” “on top of,” or “on top of” a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. “Below,” “under,” or “beneath” a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Relational terms such as “first,” “second,” etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms used in the description, such as “center,” “lateral,” “longitudinal,” “length,” “width,” “thickness,” “height,” “front,” “rear,” “left,” “right,” “up,” “down,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” “circumferential,” “clockwise,” and “counterclockwise,” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Figure 1-7As shown, a composite spring bar includes a composite spring 2 with one end fixed and the other end rotating as the curtain fabric opens and closes. The composite spring 2 comprises at least two springs of different diameters, nested in layers according to their diameters, with adjacent springs connected in series to form a combined spring. The free ends of the innermost and outermost springs, which are not connected in series with other springs, are the two ends of the combined spring. In practical applications, depending on the curtain structure, it can be chosen whether the innermost spring rotates with the curtain fabric 1 opening and closing, with the other springs rotating to store energy, or the outermost spring rotates with the curtain fabric 1 opening and closing. This composite spring bar 2 uses a multi-spring structure, with the larger diameter spring nested outside the smaller diameter spring. Compared to existing spring bars on the market, under equivalent conditions, the spring length is reduced by half. This saves space, allows for curtains with smaller widths, saves materials, reduces manufacturing costs, and is also suitable for pull-free Venetian blinds or pull-free honeycomb blinds. In some technical solutions, the composite spring 2 rod also includes a retraction tube 4 connected to the upper end of the curtain fabric 1 of the curtain, which can rotate as the curtain is opened and closed. The retraction tube 4 is sleeved on the outermost spring of the composite spring and fixed to the free end of the outermost spring. The support tube 3 passes through the innermost spring of the composite spring, and the free end of the innermost spring of the composite spring is fixed.

[0021] Specifically, the composite spring 2 includes a large spring 20 and a small spring 21, with the small spring 21 housed within the large spring 20. The large spring 20 has its two ends fixed to a large connector 23 and a conversion connector 22, respectively. The large connector 23 is fixed to the retractable tube 4. The conversion connector 22 can rotate and slide on the support tube 3. One end of the small spring 21 is fixed to the conversion connector 22, and the other end is fixedly connected to a small connector 24. The small connector 24 is fixed to the curtain's head or tail 12, the track 6, or the wall. In a specific embodiment, the small connector 24 is preferably fixedly connected to a micro-adjustment head 11, and the large connector 23 is fitted over the small connector 24, allowing free rotation. The micro-adjustment head 11 can fine-tune the torque of the small spring 21. The support tube 3 has its two ends fixed to the head and tail 12, respectively, and does not rotate itself.

[0022] Taking a pull-free curtain as an example, this pull-free curtain includes the composite spring rod 2. One end of the support tube 3 in the composite spring rod is fixed to the micro-adjustment head 11, and the other end is fixed to the tail 12. The composite spring rod 2 passes through the closing tube 4. The micro-adjustment head 11 and the tail 12 are fixed at both ends of the track 6, and a lower beam 7 is provided at the lower end of the curtain fabric 1.

[0023] In practical implementation: When the curtains are closed, the closing tube 4 rotates, causing the large connector 23 fixed to it to rotate counterclockwise. The large connector 23 drives the large spring 20 to generate torque, which is transmitted to the small spring 21 through the deflector, forming a stored force. Because the composite spring 2 needs to extend its length to generate torque, and since the small connector 24 and the support tube 3 are fixed to the micro-adjustment head 11, the large connector 23 is positioned between the small connector 24 and the micro-adjustment head 11, allowing for flexible rotation while preventing lateral movement. The composite spring 2 can only extend laterally towards the deflector end, and the deflector slides laterally along the support tube 3. Counterclockwise rotation generates stored force, and clockwise rotation releases the stored force. In another technical solution, the innermost spring of the combined spring passes through the connecting rod 5, which rotates as the curtains are opened and closed. The free end of the innermost spring is fixed to the connecting rod 5, and the free end of the outermost spring is also fixed. In this solution, the rotation of the connecting rod 5 causes the innermost spring to twist, which in turn causes the other springs to twist through a series structure.

[0024] Specifically, the composite spring 2 includes a large spring 20 and a small spring 21, with the small spring 21 housed within the large spring 20. The large spring 20 has its two ends fixed to a large connector 23 and a conversion connector 22, respectively. The large connector 23 is fixed to the curtain's head or tail 12, the track 6, or the wall. The conversion connector 22 can rotate and slide on the connecting rod 5. One end of the small spring 21 is fixed to the conversion connector 22, and the other end is fixed to the connecting rod 5 via a small connector 24. The large connector 23 can be connected to a micro-adjustment head 11 to fine-tune the elasticity of the composite spring 2. The micro-adjustment head 11 is existing technology. The connecting rod 5 can be square in shape, with the square connecting hole passing through the hole in the micro-adjustment head and allowing free rotation.

[0025] Taking a pull-free honeycomb blind as an example, this type of blind includes a curtain fabric 1, an upper rail 8, and a lower rail 9. A composite spring 2 is installed in the middle of the connecting rod 5, and trolleys 10 are installed at both ends of the connecting rod 5. The pull cord on the curtain fabric 1 is wound around the trolleys 10, and the rotation of the trolleys 10 drives the connecting rod 5 to rotate. The connecting rod 5 is located inside the upper rail 8, and the lower rail 9 is connected to the lower end of the curtain fabric 1. The trolleys 10 and the closing structure of the blind are existing technology and will not be described in detail.

[0026] In practice: As the curtains are drawn in and out, the connecting rod 5 drives the small connector 24 to rotate counterclockwise. The small connector 24 drives the small spring 21 to generate torque, which is transmitted to the large spring 20 through the deflector, thus storing the torque. Because the composite spring 2 needs to extend its length to generate torque, and because the large connector 23 is fixed to the micro-adjustment head 11, the small connector 24 can rotate flexibly while preventing lateral movement. Therefore, the composite spring 2 can only extend laterally towards the deflector end, and the deflector slides laterally along the square connecting rod 5.

[0027] Furthermore, the adapter 22 includes a large cylinder and a small cylinder arranged concentrically. The outer surfaces of the large and small cylinders are respectively provided with helical grooves to accommodate the large spring 20 and the small spring 21. The large connector 23 and the small connector 24 are also provided with helical grooves corresponding to the large spring 20 and the small spring 21, respectively. The large connector 23 and the small connector 24 are existing technologies. The adapter 22 can be fixed to both the large spring 20 and the small spring 21 simultaneously, using existing methods.

[0028] The composite spring rod of this invention, under the same torque conditions, shows a smaller increase in torque per revolution compared to existing spring rods on the market. This solves the problem of a large force difference between curtain winding and full unfolding. During the spring's torsion process, the spring's extension direction is at one end of the conversion joint 22. During extension, the conversion joint 22 slides along the support tube 3 or connecting rod 5, resulting in low frictional resistance. When the spring extends rapidly, the extension force can be released quickly due to the low resistance, thereby protecting the spring and extending the service life of the spring rod.

[0029] The technical features of the embodiments described above can be combined in any way, and as long as there is no contradiction in the combination of these technical features, they should all be considered within the scope of this specification. Without departing from the overall concept of this invention, any technical solutions based on this invention, as well as equivalent substitutions or modifications, and various changes and improvements made, should also be considered within the scope of protection of this invention.

Claims

1. A composite spring rod, characterized in that: The composite spring includes a fixed end and a rotating end that moves with the opening and closing of the curtain. The composite spring includes at least two springs with different diameters. All springs are nested in layers according to their diameters, and adjacent springs are connected in series. All springs form a combined spring. The free ends of the innermost spring and the outermost spring that are not connected in series with other springs are the two ends of the combined spring. It also includes a retractable tube connected to the upper end of the curtain fabric that can rotate as the curtain is opened and closed. The retractable tube is sleeved on the outermost spring of the combined spring and fixed to the free end of the outermost spring. The support tube passes through the innermost spring of the combined spring. The composite spring includes a large spring and a small spring, with the small spring disposed inside the large spring; both ends of the large spring are fixed to a large connector and a conversion connector, respectively; the large connector is fixed to the closing tube; the conversion connector can rotate and slide on the support tube; one end of the small spring is fixed to the conversion connector, and the other end is fixedly connected to the small connector; the small connector is fixed to the curtain head or tail, the track, or the wall. The adapter includes a large cylinder and a small cylinder arranged concentrically, and the outer surfaces of the large cylinder and the small cylinder are respectively provided with helical grooves to accommodate the large spring and the small spring; the large connector and the small connector are also provided with helical grooves corresponding to the large spring and the small spring respectively.

2. A composite spring rod, characterized in that: The composite spring includes a fixed end and a rotating end that moves with the opening and closing of the curtain. The composite spring includes at least two springs with different diameters. All springs are nested in layers according to their diameters, and adjacent springs are connected in series. All springs form a combined spring. The free ends of the innermost spring and the outermost spring that are not connected in series with other springs are the two ends of the combined spring. The innermost spring of the combined spring passes through a connecting rod that rotates as the curtains are opened and closed, and the free end of the innermost spring is fixed to the connecting rod. The composite spring includes a large spring and a small spring, with the small spring disposed inside the large spring; both ends of the large spring are fixed to a large connector and a conversion connector, respectively; the large connector is fixed to the curtain retractor tube or track, and the conversion connector can rotate and slide on the connecting rod; one end of the small spring is fixed to the conversion connector, and the other end is fixed to the connecting rod. The adapter includes a large cylinder and a small cylinder arranged concentrically, and the outer surfaces of the large cylinder and the small cylinder are respectively provided with helical grooves to accommodate the large spring and the small spring; the large connector and the small connector are also provided with helical grooves corresponding to the large spring and the small spring respectively.

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