Patent ID: 12203324

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and illustrations are only used to explain the present invention and are not intended to limit the present invention, and that the embodiments of the present invention and the features of the embodiments can be combined with each other without conflict.

Referring toFIGS.1-5, an embodiment of the present disclosure provides a curtain cord winding device including a base1, a cord winding mechanism2rotatably mounted to the base1, and a drive mechanism3for driving the cord winding mechanism2to rotate. The cord winding mechanism2includes a main reel20fitted about a drive shaft30of the drive mechanism3and fixed relative to the drive shaft30in the circumferential direction. The main reel20includes a first winding segment201for winding a cord4, and a screw segment202connected to an end of the first winding segment201and screwed with a screw hole10on the base1. The cord winding mechanism2further includes at least one secondary reel22. The main reel20and the at least one secondary reel22are coaxially arranged and are fixed in turn. Each secondary reel22includes a second winding segment221with the same structure as the first winding segment201, and a first connecting member223arranged at an end of the second winding segment221. An end of the first winding segment201away from the screw segment202and an end of the second winding segment221away from the first connecting member223each is provided with a second connecting member24. The first connecting member223on each secondary reel22is fixed to the second connecting member24on the main reel20or the secondary reel22in the axial direction.

In the embodiment of the present application, the cord winding mechanism2including the main reel20and the at least one secondary reel22is provided. The main reel20is fitted about the drive shaft30and is fixed relative to the drive shaft30in the circumferential direction. One end of the main reel20is also provided with a screw segment202screwed to the base1, and two ends of each secondary reel22are provided with one first connecting member223and one second connecting member24, respectively. The end of the main reel20away from the screw segment202is provided with one second connecting member24. The main reel20and the at least one secondary reel22are arranged coaxially and fixedly connected in sequence. The first connecting member223on each secondary reel22is connected to the second connecting member24on the adjacent one of the main reel20and the at least one secondary reel22on the axial direction, thereby realizing the serial connection of the multiple reels and the fixation in the circumferential direction, which ensures the synchronization of the retracting or releasing curtains of the multiple reels. The screw segment202only needs to be provided on the main reel20to fix the entire cord winding mechanism2to the base1, thereby minimizing the size of the position occupied by the multiple reels in the width direction of the curtain, making the device suitable for curtains with smaller widths.

In an embodiment of the present application, the first connecting member223includes two elastic arms2230each with a hook2230aat a distal end. The second connecting member24includes a cylinder241for being fixed to the first winding segment201or the second winding segment221, and an end plate243connected to the cylinder241as a whole. A through hole2430for the drive shaft30extending through is defined in a middle of the end plate243. Two fixing grooves2430aare formed in the periphery of the through hole2430. The elastic arms2230are extended through the fixing grooves2430aof the through hole2430from an outer side of the end plate243, and an end surface of the second winding segment221and the hooks2230aare respectively abutted against the outer side and an inner side of the end plate243.

In the embodiment, the elastic arms2230with the hooks2230aat the distal ends are provided on the first connecting member223, and the fixing grooves2430aare defined in the periphery of the through hole2430in the middle of the end plate243of the second connecting member24. In assembly, the elastic arms2230are extended through the fixing grooves2430aof the through hole2430from the outer side of the end plate243, and after being in place, the end surface of the second winding segment221and the hooks2230aare respectively abutted against the outer side and the inner side of the end plate243of the second connecting member24on the adjacent main reel20or secondary reel22. Therefore, a stable connection is achieved without falling off.

In an embodiment of the present application, the periphery of the through hole2430is further formed with two positioning slots2430b, and the first connecting member223further includes two positioning pins2232. When the first connecting member223is connected to the second connecting member24, the positioning pins2232are engaged in the positioning slots2430bto be positioned. In the embodiment, the positioning slots2430bare formed on the periphery of the through hole2430, and correspondingly, the first connecting member223further includes the positioning pins2232. Therefore, when the first connecting member223is connected to the second connecting member24, the positioning pins2232are engaged in the positioning slots2430bfor positioning, which can make the connection operation of the first connecting member223and the second connecting member24faster, so as that the positioning effect is better, and the connection is more stable.

In an embodiment of the present application, referring toFIG.4, a middle of the main reel20and/or each secondary reel22defines an insertion hole25whose cross section is non-circular and is adapted to a cross section of the drive shaft30, and the drive shaft30corresponds to be inserted into the insertion hole25. In the embodiment, the non-circular insertion hole25is defined in the middle of the main reel20and/or the secondary reel22, so that the main reel20and/or the secondary reel22and the drive shaft30inserted therein will not slide relative to each other in the circumferential direction, which ensures the effective transmission of the drive shaft30. In the embodiment shown inFIG.4, an inner wall of the insertion hole25is formed with a rib250, so that the cross section of the insertion hole25is non-circular, which matches a corresponding groove300defined in the drive shaft30to realize positioning and transmission cooperation.

In an embodiment of the present disclosure, the first winding segment201and the second winding segment221each includes a small-diameter section201a, a cone section201b, and a large-diameter section201cconnected in order along the axial direction. An outer diameter of the cone section201bgradually increases from the small-diameter section201ato the large-diameter section201c. An end of the large-diameter section201caway from the small-diameter section201ais provided with a fixing portion26for fixing a tail end of the cord4. An end of the small-diameter section201aof the first winding segment201away from the large-diameter section201cis connected to the screw segment202. The second connecting member24is arranged inside the end of the large-diameter section201caway from the cone section201b. In the embodiment, the first winding segment201and the second winding segment221each is provided with the small-diameter section201a, the cone section201b, and the large-diameter section201cconnected in order along the axial direction, and the fixing portion26is formed on the end of the large-diameter section201caway from the small-diameter section201a. When the curtain is released or retracted, the curtain body is at different heights, and the cords4with stress points at different positions on the first winding segment201or the second winding segment221can be matched with different tube outer diameters. Therefore, it is ensured that the moment of the cord4functioning on the first winding segment201or the second winding segment221during the entire retracting or releasing process is relatively stable, and the drive mechanism3with a constant torque output can be used to reduce costs. At the same time, the second connecting member24is arranged inside the large-diameter segment201c, to facilitate the insertion and connection of the first connecting member223at the end of the small-diameter section201a, and to further shorten the axial length of the cord winding mechanism2.

In an embodiment of the present disclosure, referring toFIG.3, the cylinder241is also provided with two positioning grooves241a, and a plurality of elastic tabs241ceach with a positioning protrusion241bprotruding out from a distal end. An inner wall of the large-diameter section201cforms two positioning ribs280and a plurality of positioning holes282. When the second connecting member24is engaged in the large-diameter section201c, the positioning ribs280are engaged in the corresponding positioning grooves241a, and the positioning protrusions241bof the elastic tabs241care engaged in the corresponding positioning holes282. In the embodiment, the positioning grooves241aand the elastic tabs241cwith the positioning protrusions241bare provided on the cylinder241, and the positioning ribs280and the positioning holes282are correspondingly provided on the inner wall of the large-diameter section201c. Therefore, when the second connecting member24is assembled inside the large-diameter section201c, the positioning grooves241aand the positioning ribs280are engaged to achieve axial guidance and circumferential positioning. When the second connecting member24is plugged into place, the positioning protrusions241band the positioning holes282are snap-fitted to achieve circumferential and axial positioning, to prevent the second connecting member24from disengaging from the large-diameter section201c, thereby realizing an effective fixed connection between the second connecting member24and the main reel20or the secondary reel22, and the structure is simple and it is convenient to assemble. In disassembly, the positioning protrusions241bonly need to be pushed from the outside to make the positioning protrusions241bdisengage from the positioning holes282, and then the second connecting member24can be pulled out from the inside of the large diameter section201c.

In an embodiment of the present disclosure, referring toFIGS.1-5, outer sides of the small-diameter section201a, the cone section201b, and the large-diameter section201care all provided with first external threads21that are connected in order. The base1defines a cord outlet12. The tail end of the cord4is fixed to the fixing portion26, and an opposite end of the cord4extends outside the base1through the cord outlet12. A part of the cord4located between the fixing portion26and the cord outlet12is wound and extended along thread grooves of the first external threads21. In the embodiment, the fixing portion26and the first external threads21are arranged on the cord winding mechanism2, and the cord outlet12is defined in the base1to guide and wind the cord4in an orderly manner, avoiding the cord4to slip off from the cord winding mechanism2or to be tangled in disorder, so that the retracting or unwinding of the cord4is more smooth, and the phenomenon of asynchronous retracting or unwinding of different cords is avoided.

In an embodiment of the present disclosure, referring toFIG.1andFIG.2, the first external threads21on the small-diameter section201aare also connected with second external threads202aformed on the outer side of the screw section202and screwing with the screw hole10. In the embodiment, the first external threads21and the second external threads202aare set as an integral connection, which can effectively utilize the small diameter section201ato be screwed to the screw hole10, thereby further shortening the length of the main reel20.

In an embodiment of the present disclosure, referring toFIGS.1-3, the base1forms cord guiding holders14, corresponding to the main reel20and the secondary reel22, to respectively guide the cords4to be wound onto the main reel20or the secondary reel22. The end of the large-diameter section201caway from the small-diameter section201ais further provided with a positioning portion29protruding from an outer surface of the large-diameter section201c, to abut against the cord guiding holder14so as to position an initial position of the main reel20or the secondary reel22. In the embodiment, the cord guiding holder14is provided on the base1, to facilitate assembly. At the same time, the positioning portions29protrude from the outer surfaces of the large-diameter sections201c, and the positioning portions29abut against the cord guiding holders14to position the initial positions of the main reel20and the secondary reel22, which can ensure that the cords4respectively wound on the main reel20and the secondary reel22can be retracted or unwound synchronously, so as to avoid the deflection of the curtain body during retracting or releasing of the curtain.

In an embodiment of the present disclosure, referring toFIG.1, a nut16is embedded at one end of the base1, and the threaded hole of the nut16functions as the screw hole10. In the embodiment, the nut16is embedded at the end of the base1, and the threaded hole on it is the screw hole10to which the screw section202is screwed. The nut16as a common mechanical part is economical and easy to obtain, and is easy to maintain and replace.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the specific implementations described above, and the specific implementations described above are only schematic and not limiting. Under the enlightenment of this application, many forms can be made without departing from the scope of this application and the scope of protection of the claims, and these are all included in the scope of protection of this application.