WINDOW COVERING

Abstract

A window covering is provided according to the present application, to achieve automatic extending or retracting of a window covering curtain. The window covering includes: a rotating shaft for extending and retracting control, a wound sheet spring and a cord winding box. The extending and retracting of the window covering curtain is achieved by winding the curtain pull cord via the cord winding box, and the force transmission between the wound sheet spring and the cord winding box is achieved by gear transmission. A spring wound sheet is provided inside the wound sheet spring. One proper wound sheet spring is chosen according to the weight of the window covering curtain to allow the window covering curtain to maintain a balance state of force without under the effect of an external force, to fix the extending or retracting state of the window covering curtain.

Claims

1. A window covering, comprising a rotating shaft for extending and retracting control, a cord winding box, and at least one wound sheet spring, wherein, the wound sheet spring comprises a spring sheet, an elastic force transmission shaft, a first transmission gear and a second transmission gear, the spring sheet is wound around the elastic force transmission shaft, the first transmission gear is fixedly connected to the elastic force transmission shaft, the second transmission gear is connected to the first transmission gear by meshing, and the second transmission gear is sleeved on the rotating shaft for extending and retracting control; and the cord winding box comprises a winding reel, a third transmission gear, and a fourth transmission gear, the winding reel is wound thereon with a curtain pull cord of the window covering, the third transmission gear is fixedly connected to the winding reel, the fourth transmission gear is connected to the third transmission gear by meshing, and the fourth transmission gear is sleeved on the rotating shaft for extending and retracting control.

2. The window covering according to claim 1, further comprising a speed limiter, wherein the speed limiter comprises a fifth transmission gear, a sixth transmission gear, a speed limiting member, a speed limiting transmission shaft, and a fastener, wherein a first shaft connecting hole is provided at a central portion of the sixth transmission gear, and the sixth transmission gear is sleeved on the rotating shaft for extending and retracting control via the first shaft connecting hole; the sixth transmission gear is connected to the fifth transmission gear by meshing; and the speed limiting transmission shaft is fixedly connected to the fifth transmission gear; and the speed limiting member is sleeved on a periphery of the speed limiting transmission shaft, the speed limiting member comprises a connecting portion for speed limiting control, and the fastener is configured to connect the connecting portion for speed limiting control.

3. The window covering according to claim 2, wherein the speed limiting member is an elastic rubber sheet.

4. The window covering according to claim 1, wherein a first intermediate transmission gear is further provided between the first transmission gear and the second transmission gear, and a second intermediate transmission gear is further provided between the third transmission gear and the fourth transmission gear; and the first intermediate transmission gear is connected by meshing to the first transmission gear and the second transmission gear respectively, and the second intermediate transmission gear is connected by meshing to the third transmission gear and the fourth transmission gear respectively.

5. The window covering according to claim 2, wherein a third intermediate transmission gear is further provided between the fifth transmission gear and the sixth transmission gear; and the third intermediate transmission gear is connected by meshing to the fifth transmission gear and the sixth transmission gear respectively.

6. The window covering according to claim 1, further comprising a window covering curtain, wherein a pull cord connecting hole is provided in the window covering curtain; and the curtain pull cord is connected to the window covering curtain via the pull cord connecting hole.

7. The window covering according to claim 6, further comprising a rotating shaft for curtain state control and a curtain state controller, wherein the curtain state controller is fixedly connected to the rotating shaft for curtain state control; and the rotating shaft for curtain state control rotates to drive the curtain state controller to rotate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] For more clearly illustrating embodiments of the present application or the technical solution in the conventional technology, drawings referred to describe the embodiments or the conventional technology will be briefly described hereinafter. Apparently, the drawings in the following description are only several embodiments of the present application, and for the person skilled in the art other drawings may be obtained based on these drawings without any creative efforts.

[0031] FIG. 1 is a schematic view showing an external structure of a window covering according to an embodiment of the present application;

[0032] FIG. 2 is a schematic diagram showing the implementing principle of a control structure for a curtain pull cord of a window covering according to an embodiment of the present application; and

[0033] FIG. 3 is a schematic diagram showing an internal structure of a speed limiter according to an embodiment of the present application.

REFERENCE NUMERALS IN THE ABOVE FIGURES

[0034] 10 rotating shaft for curtain state control, 20 rotating shaft for extending and retracting control,

TABLE-US-00001 30 wound sheet spring, 31 first transmission gear, 32 second transmission gear, 33 first intermediate transmission gear, 34 spring sheet, 35 elastic force transmission shaft, 40 cord winding box, 41 third transmission gear, 42 fourth transmission gear, 43 second intermediate transmission gear, 44 curtain pull cord, 45 winding reel, 50 speed limiter, 51 fifth transmission gear, 52 sixth transmission gear, 53 third intermediate transmission gear, 54 speed limiting member, 55 fastener, 56 first shaft connecting hole, 57 second shaft connecting hole, 541 connecting portion for speed limiting control, and 60 curtain state controller.

DETAILED DESCRIPTION

[0035] It is provided according to an embodiment of the present application a window covering, configured to achieve automatic extending or retracting of a window covering curtain.

[0036] For the purpose, the features and the advantages of the present application to be more apparent and readily understood, technical solutions in the embodiments of the present application will be clearly and fully described hereinafter in conjunction with accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only a part, rather than all, of the embodiments of the present application. All other embodiments obtained by those ordinary skilled in the art based on the embodiments of the present application without making any creative efforts fall within the protection scope of the present application.

[0037] The technical solutions of the present application are further described hereinafter in conjunction with drawings and specific embodiments.

[0038] Referring to FIGS. 1 and 2, FIG. 1 is a schematic view showing an external structure of a window covering according to an embodiment of the present application, and FIG. 2 is a schematic diagram showing the implementing principle of a control structure for a curtain pull cord of a window covering according to an embodiment of the present application. The window covering includes: a rotating shaft for curtain state control 10, a rotating shaft for stretching and retracting control 20, a wound sheet spring 30, a cord winding box 40, a speed limiter 50, and a curtain state controller 60.

[0039] The cord winding box 40 is wound thereon with a curtain pull cord 44, the curtain pull cord 44 has one end fixed to the cord winding box 40 and another end connected to the window covering curtain, and is configured to control the extending and retracting of a window covering curtain.

[0040] Specifically, the implementing principle of the wound sheet spring 30 is similar to that of a mainspring, and an elastic wound sheet is provided inside the wound sheet spring, and the greater a wound extent of the elastic wound sheet is, the greater an elastic force the elastic wound sheet has. The wound sheet spring 30 includes a spring sheet 34, an elastic force transmission shaft 35, a first transmission gear 31, a second transmission gear 32, and a first intermediate transmission gear 33. The spring sheet 34 is wound around the elastic force transmission shaft 35. The first transmission gear 31 is fixedly connected to the elastic force transmission shaft 35. The second transmission gear 32 is sleeved on the rotating shaft for extending and retracting control 20. The first intermediate transmission gear 33 is arranged between the first transmission gear 31 and the second transmission gear 32. The first intermediate transmission gear 33 is connected by meshing to the first transmission gear 31 and the second transmission gear 32 respectively.

[0041] The cord winding box 40 includes a winding reel 45, a third transmission gear 41, a fourth transmission gear 42, and a second intermediate transmission gear 43. The winding reel 45 is wound thereon with a curtain pull cord 44 of the window covering. The third transmission gear 41 and the winding reel 45 are fixedly connected. The fourth transmission gear 42 is sleeved on the rotating shaft for extending and retracting control 20. The second intermediate transmission gear 43 is arranged between the third transmission gear 41 and the fourth transmission gear 42. The second intermediate transmission gear 43 is connected by meshing to the third transmission gear 41 and the fourth transmission gear 42 respectively.

[0042] The rotating shaft for extending and retracting control 20 rotates to drive the winding reel 45 to rotate via the gear transmission, thus controlling the retracting and extending of the curtain pull cord 44.

[0043] Referring to FIG. 3, FIG. 3 is a schematic diagram showing an internal structure of a speed limiter 50 according to an embodiment of the present application, and is a right view of FIG. 1.

[0044] Specifically, the wind covering further includes the speed limiter 50. The speed limiter 50 includes a fifth transmission gear 51, a sixth transmission gear 52, a third intermediate transmission gear 53, a speed limiting member 54, a speed limiting transmission shaft, and a fastener 55.

[0045] The sixth transmission gear 52 is provided at a central portion thereof with a first shaft connecting hole 56, and the sixth transmission gear 52 is sleeved on the rotating shaft for extending and retracting control 20. The fifth transmission gear 51 is provided at a central portion thereof with a second shaft connecting hole 57, and the second shaft connecting hole 57 is configured to allow the rotating shaft for curtain state control 10 to pass through the speed limiter 50, but the rotating shaft for curtain state control 10 is not fixedly connected to the speed limiter 50.

[0046] In this embodiment, the window covering includes two curtain state controllers 60, which are respectively located at two sides of the rotating shaft for curtain state control 10 or the rotating shaft for extending and retracting control 20. To meet the mounting requirements, the rotating shaft for curtain state control 10 is required to pass through various components, therefore, each of the wound sheet spring 30 and the cord winding box 40 is provided with a through hole similar to the second shaft connecting hole 57, configured to allow the rotating shaft for curtain state control 10 to pass through, however, the wound sheet spring 30 and the cord winding box 40 are not fixedly connected to the rotating shaft for curtain state control 10. It may be appreciated that, multiple curtain state controllers 60 may be provided, which should all fall into the protection scope of the present application.

[0047] Specifically, the third intermediate transmission gear 53 is connected by meshing to the sixth transmission gear 52 and the fifth transmission gear 51 respectively. The speed limiting transmission shaft is fixedly connected to the fifth transmission gear 51. The speed limiting member 54 is sleeved on a periphery of the speed limiting transmission shaft. The speed limiting member 54 includes a connecting portion for speed limiting control 541. The fastener 55 is configured to connect the connecting portion for speed limiting control 541.

[0048] In this embodiment, considering that it is difficult to perfectly match the elastic force of the wound sheet spring 30 and a weight of the window covering curtain, the elastic force of the wound sheet spring 30 is either greater or less than the weight of the window covering curtain, such that the extent of extending and retracting of the window covering curtain cannot be fixed. Therefore, the speed limiter 50 is provided on the rotating shaft for extending and retracting control 20. The speed limiter 50 can provide a certain resistance for the rotation of the rotating shaft for extending and retracting control 20, to further limit the rotation of the rotating shaft for extending and retracting control 20, and have an effect similar to braking. In this embodiment, the fastener 55 is embodied as a bolt, and by adjusting the tightening extent of the bolt, the extent of the speed limiting member 54 abutting against the periphery of the speed limiting transmission shaft may be appropriately adjusted, and further the resistance of the speed limiting member 54 applied to the speed limiting transmission shaft may be changed, thus is convenient. The speed limiting member 54 is preferably an elastic rubber sheet or an elastic plastic sheet.

[0049] In this embodiment, since there are two rotating shafts, i.e., the rotating shaft for curtain state control 10 and the rotating shaft for extending and retracting control 20, a distance between the two rotating shafts may be adjusted according to different requirements. In the case that the distance is too large, it may be required to additionally provide one or even more intermediate transmission gears to perform the transmission, to meet different dimension requirements, which should all fall into the protection scope of the present application.

[0050] Specifically, the window covering curtain of the window covering is provided with a pull cord connecting hole; and the curtain pull cord 44 is connected to the window covering curtain via the pull cord connecting hole.

[0051] In this embodiment, the window covering is a Venetian blind window covering, and thus the window covering further includes a curtain state controller 60. The curtain state controller 60 is fixedly connected to the rotating shaft for curtain state control 10. The rotating shaft for curtain state control 10 rotates to drive the curtain state controller 60 to rotate. Specifically, the window covering curtain is further provided with a curtain state adjusting ladder cord. The curtain state adjusting ladder cord is connected to the curtain state controller 60. The curtain state controller 60 rotates to drive the curtain state adjusting ladder cord to move up and down, thus may further adjust a state of the window covering curtain, for example, to adjust slats of the window covering curtain to be in a horizontal state or a vertical state.

[0052] In this embodiment, in addition to the structures in the above description, the window covering further includes a switch, a packaging housing and other related components, for example a switch or a device configured to control the rotation of the rotating shaft for curtain state control 10, which should all fall into the protection scope of the present application.

[0053] In this embodiment, the number of the cord winding boxes 40 is not limited or illustrated, however, it should be appreciated that, the number of the cord winding boxes 40 is generally two, and the two cord winding boxes 40 are respectively located at two ends of the rotating shaft for curtain state control 10, in order to facilitate smooth retracting and extending of the window covering curtain. In some cases, if the window covering curtain is too large, or is too heavy, in addition to providing the cord winding boxes 40 at the two ends of the rotating shaft for curtain state control 10, one or more cord winding boxes 40 may also be added in a middle portion of the rotating shaft for curtain state control 10, to further increase the smoothness of retracting and extending of the window covering curtain, which should all fall into the protection scope of the present application.

[0054] In this embodiment, the portion of the wound sheet spring 20 configured to generate a pulling force adopts an elastic wound sheet, which has a low cost and is a preferred implementation. It may be appreciated that, the elastic wound sheet may be replaced by other structures, for example, an electromagnet, and the current flowing through the electromagnet may be associated with a rotating angle, which should all fall into the protection scope of the present application.

[0055] In this embodiment, the transmission member is embodied as gear transmission members. It may be appreciated that, the gear transmission may be replaced by other ways of transmission, for example, by a chain transmission, a belt transmission, etc., which should all fall into the protection scope of the present application.

[0056] The above description and the above embodiments are only intended to illustrate the technical solutions of the present application, and should not be interpreted as a limitation. Though the present application has been described in detail by referring to the above embodiments, it should be understood by the person skilled in the art that, modifications may be made to the technical solutions set forth in the various embodiments described above, or equivalent substitutions may be made to partial the technical features in the above embodiments; and all these modifications or substitutions do not make the essence of the respective technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present application.