Curtain cord retractor

Abstract

The embodiment of the present invention provides a curtain cord retracting and releasing device, comprising: a housing; an output shaft pivotally mounted on the housing, an axial through hole being provided at the axis of the output shaft; a spring winding frame; a plane scroll spring; an end cover, comprising a cover plate and a friction shaft protruding from the middle of the inner side surface of the cover plate; a ratchet assembly, comprising a ratchet arranged at one end of the output shaft facing the cover plate and coaxial with the output shaft, a plurality of symmetrically distributed pawls pivotally connected to the cover plate, and an elastic member arranged one-to-one with the pawls and having two ends respectively abutting against the pawls and the cover plate so that the pawls and the ratchet maintain unidirectional synchronous linkage cooperation; a torsion spring, comprising a spring body and spring arms extending radially from opposite ends of the spring body, the inner hole of the spring body and the friction shaft being interference-fitted, the two spring arms being respectively accommodated in corresponding limiting notches provided on the housing, and when the pawls and the ratchet are synchronously linked, the spring body and the friction shaft slide relative to each other to form sliding friction resistance. This embodiment can effectively prevent the plane scroll spring from being damaged.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of curtain accessories, and in particular to a curtain cord retracting and releasing device. Background Art

[0002] Generally, a curtain cord retracting device comprises a housing, a winding wheel assembled in the housing for winding the cord thereon, and a power mechanism assembled in the housing and connected to the winding wheel to drive the winding wheel to rotate; wherein the power mechanism further comprises an output shaft, a spring winding frame parallel to the axial direction of the output shaft, and a plane scroll spring assembled on the spring winding frame and with the outer end fixed to the outer side surface of the output shaft. However, the inventors found in the specific implementation that due to the lack of necessary damping structure between the existing power mechanism, the output shaft and the plane scroll spring, the plane scroll spring is easily damaged during the raising and lowering process of the curtain body, and the design cost of the plane scroll spring is relatively high and difficult to maintain. Summary of the invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a curtain cord retracting and releasing device which can effectively prevent the flat scroll spring from being damaged.

[0004] In order to solve the above technical problems, the embodiment of the present invention first provides the following technical solution: a curtain cord retracting device, comprising:

[0005] case;

[0006] An output shaft pivotally mounted on the housing, wherein an axial through hole is formed at the axis center of the output shaft;

[0007] A spring winding frame parallel to the output shaft and pivotally mounted on the housing;

[0008] A planar spiral spring which is wound and assembled on the spring winding frame and whose outer end is fixed to the outer side surface of the output shaft;

[0009] An end cover, comprising a cover plate disposed on the outer side of one end surface of the output shaft and a friction shaft protruding from the middle of the inner side surface of the cover plate, wherein the friction shaft is passed through the axial through hole of the output shaft;

[0010] A ratchet assembly, comprising a ratchet wheel arranged at one end of the output shaft facing the cover plate and coaxial with the output shaft, a plurality of pawls symmetrically distributed and pivotally connected to the cover plate, and an elastic member arranged one-to-one corresponding to the pawls and having two ends respectively abutting against the pawls and the cover plate so that the pawls and the ratchet wheel maintain unidirectional synchronous linkage cooperation; and

[0011] The torsion spring comprises a spring body sleeved on the friction shaft and spring arms radially extending from opposite ends of the spring body, the inner hole of the spring body is interference fit with the friction shaft, and the two spring arms are respectively accommodated in corresponding limiting notches on the shell, and when the pawl is synchronously linked with the ratchet wheel, the spring body and the friction shaft slide relative to each other to form a sliding friction resistance.

[0012] Furthermore, a bushing made of a wear-resistant material is coaxially fixed to the outer side surface of one end of the friction shaft close to the torsion spring, and the spring body is sleeved on the outside of the bushing.

[0013] Furthermore, a sleeve is formed on the shell, the torsion spring is installed in the sleeve, the side wall of the sleeve forms the limiting notch, the bottom wall of the sleeve protrudes toward the opening direction to form a positioning column, and a positioning shaft hole is provided on the end face of one end of the friction shaft close to the torsion spring, and the friction shaft is inserted into the sleeve and sleeved on the positioning column.

[0014] Furthermore, the width of the limiting notch is greater than the diameter of the spring arm. When the pawl and the ratchet wheel are synchronously linked, the spring arm at one end of the torsion spring presses against the side wall of the limiting notch to loosen the adjacent part of the spring body relative to the friction shaft.

[0015] Furthermore, a first countersunk hole is formed in the middle of one end of the output shaft facing the cover plate, and ratchet teeth are formed on the hole wall of the first countersunk hole to form the ratchet wheel. The cover plate covers the first countersunk hole, and the ratchet pawl is accommodated in the first countersunk hole.

[0016] Furthermore, a second countersunk hole is formed in the middle of one end of the output shaft away from the cover plate, the sleeve is inserted into the second countersunk hole, and the torsion spring is accommodated in the second countersunk hole.

[0017] Furthermore, the elastic member is a spring sheet and one end of the elastic member is connected to the pawl as a whole and is V-shaped. A pivot hole is provided at the connection portion between the pawl and the spring sheet. A pivot shaft corresponding to the pawl is protruded from one side of the cover plate toward the pawl, and the pawl is pivotally connected to the pivot shaft of the cover plate via the pivot hole.

[0018] Furthermore, the cover plate protrudes from one side surface toward the pawl to form a stopper portion which is arranged in one-to-one correspondence with the pawl, and each pawl abuts against the stopper portion with the spring sheet.

[0019] Furthermore, a slot is symmetrically arranged on the side wall of the bushing along the axial direction, and a plug-in block is symmetrically protruded from the side wall of one end of the friction shaft toward the torsion spring. The friction shaft is inserted into the bushing, and the plug-in block is inserted into the slot to arrange the bushing and the friction shaft coaxially and relatively fixed in the circumferential direction.

[0020] Furthermore, the curtain cord retracting and releasing device also includes two winding wheels, and the cord winding directions on the two winding wheels are opposite, the two winding wheels are respectively connected to the spring winding frame and the output shaft, the spring winding frame and the output shaft are also connected to the output shaft, and the opposite ends of the shell are provided with through holes for the cord to pass through, and the two winding wheels are respectively arranged at the opposite ends of the shell.

[0021] After adopting the above technical scheme, the embodiment of the present invention has at least the following beneficial effects: the embodiment of the present invention adds a torsion spring, a ratchet assembly and an end cover, and the pawl and the ratchet are kept in one-way synchronous linkage cooperation through the elastic member of the ratchet assembly, and the inner hole of the spring body of the torsion spring is interference fit with the friction shaft of the end cover, when the output shaft is along the first clockwise direction, the ratchet teeth of the ratchet push the pawl, and the pawl further pushes the elastic member and the cover plate, at this time, due to the interference fit between the spring body of the torsion spring and the friction shaft, there is static friction between the two and the friction force is relatively large, the spring body and the friction shaft are relatively fixed, and the elastic member generates elastic force to make the pawl rebound so as to engage in each tooth groove of the ratchet in turn, and the ratchet The ratchet teeth of the wheel push the pawl to overcome the elastic force of the elastic member to realize the rotation of the output shaft; when the output shaft rotates along the second clockwise direction, since the tooth grooves of the pawl and the ratchet wheel are in a clamping and aligned state, at this time, in order to realize the rotation of the output shaft, the pawl rotates synchronously with the ratchet wheel, and the pawl is pivotally connected to the cover plate, and the friction shaft is formed by protruding from the middle part of the inner side surface of the cover plate. Since the spring body and the friction shaft slide relative to each other at this time to form a sliding friction resistance, the friction force is relatively reduced, and the friction shaft moves synchronously with the ratchet wheel, thereby realizing the rotation of the output shaft, and the mutual friction between the friction shaft and the spring body realizes the damping transmission, limits the movement of the output shaft, and prevents the damage of the plane scroll spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the disassembled state of an optional embodiment of the curtain cord retracting and releasing device of the present invention.

[0023] Figure 2 The figure is a schematic diagram of the assembly state of an optional embodiment of the curtain cord retracting and releasing device of the present invention.

[0024] Figure 3 The figure is a schematic cross-sectional view along the output shaft of an optional embodiment of the curtain cord retracting and releasing device of the present invention.

[0025] Figure 4 It is a schematic diagram of a pawl of an optional embodiment of the curtain cord retracting and releasing device of the present invention.

[0026] Figure 5 This is a schematic structural diagram of the assembly of a friction shaft, a torsion spring and a housing in an optional embodiment of the curtain cord retracting and releasing device of the present invention.

[0027] Figure 6This is a schematic diagram of the partial cross-sectional structure of the mid-axis surface of the shell length of an optional embodiment of the curtain cord retracting and releasing device of the present invention. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. In addition, the embodiments and features in the embodiments of the present application may be combined with each other without conflict.

[0029] like Figure 1-Figure 6 As shown, an optional embodiment of the present invention provides a curtain cord retracting device, comprising:

[0030] Shell 1;

[0031] An output shaft 2 is pivotally mounted on the housing 1, and an axial through hole 20 is formed at the axis of the output shaft 2;

[0032] A spring winding frame 3 parallel to the output shaft 2 and pivotally mounted on the housing 1;

[0033] A planar spiral spring 4 which is wound and assembled on the spring winding frame 3 and whose outer end is fixed to the outer side surface of the output shaft 2;

[0034] The end cover 5 includes a cover plate 50 disposed on the outer side of one end surface of the output shaft 2 and a friction shaft 52 protruding from the middle of the inner side surface of the cover plate 50, and the friction shaft 52 is penetrated through the axial through hole 20 of the output shaft 2;

[0035] The ratchet assembly 6 comprises a ratchet 60 disposed at one end of the output shaft 2 facing the cover plate 50 and coaxial with the output shaft 2, a plurality of pawls 62 symmetrically distributed and pivotally connected to the cover plate 50, and an elastic member 64 disposed one-to-one corresponding to the pawls 62 and having two ends respectively abutting against the pawls 62 and the cover plate 50 so that the pawls 62 and the ratchet 60 maintain unidirectional synchronous linkage cooperation; and

[0036] The torsion spring 7 includes a spring body 70 sleeved on the friction shaft 52 and spring arms 72 radially extending from opposite ends of the spring body 70. The inner hole of the spring body 70 is interference fit with the friction shaft 52. The two spring arms 72 are respectively accommodated in corresponding limiting notches 10 opened on the housing 1. When the pawl 62 is synchronously linked with the ratchet wheel 60, the spring body 70 slides relative to the friction shaft 52 to form a sliding friction resistance.

[0037] In the embodiment of the present invention, a torsion spring 7, a ratchet assembly 6 and an end cover 5 are additionally provided, and the pawl 62 and the ratchet 60 are kept in unidirectional synchronous linkage cooperation through the elastic member 64 of the ratchet assembly 6, and the inner hole of the spring body 70 of the torsion spring 7 is interference-fitted with the friction shaft 52 of the end cover 5. When the output shaft 2 is moved in the first clockwise direction (in Figure 3 In the embodiment shown, the clockwise direction as indicated by the arrow A), the ratchet teeth of the ratchet wheel 60 push the pawl 62, and the pawl 62 further pushes the elastic member 64 and the cover plate 50. At this time, due to the interference fit between the spring body 70 of the torsion spring 7 and the friction shaft 52, there is static friction between the two and the friction force is relatively large. The spring body 70 and the friction shaft 52 are relatively fixed, and the elastic member 64 generates elastic force to make the pawl 62 rebound so as to be sequentially engaged in each tooth groove of the ratchet wheel 60. The ratchet teeth of the ratchet wheel 60 push the pawl 62 to overcome the elastic force of the elastic member 64 to realize the rotation of the output shaft 2. When the output shaft 2 moves along the second clockwise direction (in the Figure 3 In the illustrated embodiment, when the output shaft 2 rotates in the counterclockwise direction (as indicated by the arrow B), since the tooth grooves of the pawl 62 and the ratchet 60 are in a clamped and aligned state, at this time, in order to realize the rotation of the output shaft 2, the pawl 62 rotates synchronously with the ratchet 60, and the pawl 62 is pivotally connected to the cover plate 50, and the friction shaft 52 is formed by protruding from the middle part of the inner side surface of the cover plate 50. Since the spring body 70 and the friction shaft 52 slide relative to each other at this time to form a sliding friction resistance, the friction force is relatively reduced, and the friction shaft 52 moves synchronously with the ratchet 60, thereby realizing the rotation of the output shaft 2, and through the mutual friction between the friction shaft 52 and the spring body 70, damping transmission is realized, and the movement of the output shaft 2 is limited, thereby preventing damage to the planar scroll spring 4.

[0038] In an optional embodiment of the present invention, Figure 1 and Figure 5 As shown, a bushing 54 made of a wear-resistant material is coaxially fixed to the outer side surface of one end of the friction shaft 52 close to the torsion spring 7, and the spring body 70 is sleeved on the outside of the bushing 54. In this embodiment, the bushing 54 made of a wear-resistant material is provided, and the bushing 54 and the spring body 70 are sleeved to avoid direct friction between the spring body 70 and the friction shaft 52, thereby effectively protecting the friction shaft 52.

[0039] In another optional embodiment of the present invention, Figure 5 and Figure 6As shown, a sleeve 12 is formed on the housing 1, the torsion spring 7 is installed in the sleeve 12, the side wall of the sleeve 12 forms the limiting notch 10, the bottom wall of the sleeve 12 protrudes toward the opening direction to form a positioning column 14, and the end surface of the friction shaft 52 close to the torsion spring 7 is provided with a positioning shaft hole 521, and the friction shaft 52 is inserted into the sleeve 12 and sleeved on the positioning column 14. In this embodiment, by providing the sleeve 12 on the housing 1, by installing the torsion spring 7 in the sleeve 12, and by sleeve-joining the positioning shaft hole 521 of the friction shaft 52 with the positioning column 14 of the sleeve 12, the assembly and positioning of the torsion spring 7, the friction shaft 52 and the housing 1 can be effectively achieved.

[0040] In another optional embodiment of the present invention, Figure 5 As shown, the width of the limiting notch 10 is greater than the diameter of the spring arm 72. When the pawl 62 and the ratchet 60 are synchronously linked, the spring arm 72 at one end of the torsion spring 7 presses against the side wall of the limiting notch 10 to loosen the adjacent part of the spring body 70 relative to the friction shaft 52. In this embodiment, by designing the width of the limiting notch 10 to be greater than the diameter of the spring arm 72, when the pawl 62 and the ratchet 60 are synchronously linked, the spring arm 72 presses against the limiting notch 10 and moves until it presses against the side wall. When the spring arm 72 is further pressed against the side wall of the limiting notch 10, the part of the spring body 70 adjacent to the spring arm 72 is opened relative to the friction shaft 52, and the friction between the spring body 70 and the friction shaft 52 is reduced, thereby achieving sliding friction between the spring body 70 and the friction shaft 52.

[0041] In an optional embodiment of the present invention, Figure 1 As shown, the middle part of one end of the output shaft 2 facing the cover plate 50 is concave to form a first countersunk hole 22, the hole wall of the first countersunk hole 22 is formed with ratchet teeth to form the ratchet 60, the cover plate 50 covers the first countersunk hole 22, and the pawl 62 is accommodated in the first countersunk hole 22. In this embodiment, by arranging both the ratchet 60 and the pawl 62 in the first countersunk hole 22, the ratchet assembly 6 is equivalent to forming an internal ratchet mechanism, and the overall occupied volume is smaller.

[0042] In another optional embodiment of the present invention, Figure 6 As shown, the middle part of the end of the output shaft 2 away from the cover plate 50 is concave to form a second countersunk hole 24, the sleeve 12 is inserted into the second countersunk hole 24, and the torsion spring 7 is accommodated in the second countersunk hole 24. In this embodiment, by providing the second countersunk hole 24, the sleeve 12 and the torsion spring 7 are assembled in the second countersunk hole 24, which can further reduce the occupied volume.

[0043] In an optional embodiment of the present invention, Figure 3 and Figure 4As shown, the elastic member 64 is a spring sheet and one end is connected to the pawl 62 as a whole and is V-shaped as a whole. The connection part between the pawl 62 and the spring sheet 64 is provided with a pivot hole 621. The cover plate 50 protrudes toward one side of the pawl 62 with a pivot shaft 501 corresponding to the pawl 62. The pawl 62 is pivotally connected to the pivot shaft 501 of the cover plate 50 through the pivot hole 621. In this embodiment, the elastic member 64 is a spring sheet and is connected to the pawl 62 as a whole and is V-shaped. When the pawl 62 pushes the spring sheet 64, the spring sheet 64 can be appropriately elastically deformed to apply elastic resistance to the pawl 62. The pawl 62 can be conveniently pivoted to the cover plate 50 through the pivot hole 621 and the pivot shaft 501 of the cover plate 50.

[0044] In another optional embodiment of the present invention, Figure 4 As shown, the cover plate 50 protrudes toward one side of the pawl 62 to form a stopper 503 corresponding to the pawl 62, and each pawl 62 abuts against the stopper 503 with the spring sheet 64. In this embodiment, the stopper 503 is also provided to effectively stop and limit the spring sheet 64.

[0045] In an optional embodiment of the present invention, Figure 1 As shown, the side wall of the bushing 54 is symmetrically provided with a slot 541 along the axial direction, and the side wall of the friction shaft 52 symmetrically protrudes toward one end of the torsion spring 7 to form a plug-in block 523, the friction shaft 52 is plugged into the bushing 54, and the plug-in block 523 is plugged into the slot 541 to coaxially arrange the bushing 54 and the friction shaft 52 and relatively fix them in the circumferential direction. In this embodiment, by plugging the plug-in block 523 into the slot 541, the coaxial fixation of the friction shaft 52 and the bushing 54 can be simply and conveniently achieved.

[0046] In another optional embodiment of the present invention, Figure 1 As shown, the curtain pull cord retracting and releasing device further includes two winding wheels 8, and the pull cords on the two winding wheels 8 are wound in opposite directions, and the two winding wheels 8 are respectively connected to the spring winding frame 3 and the output shaft 2 in a transmission manner, and the spring winding frame 3 and the output shaft 2 are also connected in a transmission manner, and the opposite ends of the housing 1 are provided with through holes 16 for the pull cords to pass through, and the two winding wheels 8 are respectively arranged at the opposite ends of the housing 1. In this embodiment, by providing two winding wheels 5, and the pull cords on the two winding wheels 5 are wound in opposite directions, the rising and falling movements of the curtain are respectively arranged, and by providing through holes 32, it is convenient for the pull cords to pass through the housing 3.

[0047] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, which all belong to the protection scope of the present invention.

Claims

1. A curtain cord retracting and releasing device, characterized in that: include: case; An output shaft pivotally mounted on the housing, wherein an axial through hole is formed at the axis center of the output shaft; A spring winding frame parallel to the output shaft and pivotally mounted on the housing; A planar spiral spring which is wound and assembled on the spring winding frame and whose outer end is fixed to the outer side surface of the output shaft; An end cover, comprising a cover plate disposed outside an end surface of one end of the output shaft and a friction shaft protruding from the middle of the inner side surface of the cover plate, wherein the friction shaft is passed through the axial through hole of the output shaft; A ratchet assembly, comprising a ratchet wheel arranged at one end of the output shaft facing the cover plate and coaxial with the output shaft, a plurality of pawls symmetrically distributed and pivotally connected to the cover plate, and an elastic member arranged one-to-one corresponding to the pawls and having two ends respectively abutting against the pawls and the cover plate so that the pawls and the ratchet wheel maintain unidirectional synchronous linkage cooperation; and The torsion spring comprises a spring body sleeved on the friction shaft and spring arms radially extending from opposite ends of the spring body, the inner hole of the spring body is interference fit with the friction shaft, and the two spring arms are respectively accommodated in corresponding limiting notches on the shell, and when the pawl is synchronously linked with the ratchet wheel, the spring body and the friction shaft slide relative to each other to form a sliding friction resistance.

2. The curtain cord retracting device according to claim 1, characterized in that: A bushing made of a wear-resistant material is coaxially fixed to the outer side surface of one end of the friction shaft close to the torsion spring, and the spring body is sleeved on the outside of the bushing.

3. The curtain cord retracting device according to claim 1, characterized in that: A sleeve is formed on the shell, the torsion spring is installed in the sleeve, the side wall of the sleeve forms the limiting notch, the bottom wall of the sleeve protrudes toward the opening direction to form a positioning column, and a positioning shaft hole is provided on the end face of one end of the friction shaft close to the torsion spring. The friction shaft is inserted into the sleeve and sleeved on the positioning column.

4. The curtain cord retracting device according to claim 1 or 3, characterized in that: The width of the limiting notch is greater than the diameter of the spring arm. When the pawl and the ratchet wheel are synchronously linked, the spring arm at one end of the torsion spring presses against the side wall of the limiting notch to loosen the adjacent part of the spring body relative to the friction shaft.

5. The curtain cord retracting device according to claim 1, characterized in that: The output shaft has a first countersunk hole formed in the middle of one end facing the cover plate, and ratchet teeth are formed on the hole wall of the first countersunk hole to form the ratchet wheel. The cover plate covers the first countersunk hole, and the ratchet pawl is accommodated in the first countersunk hole.

6. The curtain cord retracting device according to claim 3, characterized in that: A second countersunk hole is formed in the middle of one end of the output shaft away from the cover plate, and the sleeve is inserted into the second countersunk hole.

7. The curtain cord retracting device according to claim 1, characterized in that: The elastic member is a spring sheet and one end of the elastic member is connected to the pawl as a whole and is V-shaped as a whole. A pivot hole is provided at the connection portion between the pawl and the spring sheet. A pivot shaft corresponding to the pawl is protruded from one side of the cover plate toward the pawl, and the pawl is pivotally connected to the pivot shaft of the cover plate via the pivot hole.

8. The curtain cord retracting device according to claim 7, characterized in that: The cover plate protrudes toward a side of the pawl to form a stopper portion which is arranged in one-to-one correspondence with the pawl, and each pawl abuts against the stopper portion with the spring sheet.

9. The curtain cord retracting device according to claim 2, characterized in that: The side wall of the bushing is symmetrically provided with slots along the axial direction, and the side wall of one end of the friction shaft protrudes symmetrically toward the torsion spring to form a plug-in block, the friction shaft is plugged into the bushing, and the plug-in block is plugged into the slot to set the bushing and the friction shaft coaxially and relatively fixed in the circumferential direction.

10. The curtain cord retracting and releasing device according to claim 1, characterized in that: The curtain cord retracting and releasing device also includes two winding wheels, and the cord winding directions on the two winding wheels are opposite. The two winding wheels are respectively connected to the spring winding frame and the output shaft in a transmission manner. The spring winding frame and the output shaft are also connected in a transmission manner. The opposite ends of the shell are provided with through holes for the cord to pass through, and the two winding wheels are respectively arranged at the opposite ends of the shell.

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