CN113257605B - Novel stay cord dimming system - Google Patents

Abstract

The invention discloses a novel pull rope dimming system which comprises a load and a dimmer for controlling the load, wherein the load and the dimmer are connected between a live wire and a zero wire of an alternating current source in series, the dimmer is a pull rope dimmer, and when a pull rope of the pull rope dimmer is pulled, a microswitch in the pull rope dimmer is touched, so that the on/off/dimming of the load is controlled by recognizing the action of the microswitch through signals. According to the invention, the pull rope of the pull rope dimmer is pulled to touch the micro switch in the pull rope dimmer, and different control signals are sent out according to the time length of touching the micro switch, so that the functions of turning on/off, dimming and the like of a load are realized.

Description

Novel stay cord dimming system

Technical Field

The invention relates to the technical field of light modulators, in particular to a novel pull rope light modulation system.

Background

The dimmer is widely used at home and abroad, and aims to meet different requirements of people on the brightness of lamplight in different application scenes, play a role in adjusting atmosphere, save energy and reduce emission by reducing the brightness of the lamplight, and relieve the problem of atmospheric warming.

At present, a pull-cord switch on the market only has the function of switching on and off a lamp and does not have the function of dimming; and the domestic dimmer in the market mainly installs in the terminal box, and mainly adjusts luminance with the control mode of manual rotation or manual push type, and this kind of control mode mounted position is relatively more fixed, can't change mounted position according to actual demand, to the old building that has wired and installed the stay cord and open the light in addition, reinstallate the dimmer and need change the house circuit.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a novel pull rope dimming system.

The technical scheme of the invention is as follows:

a novel pull rope dimming system comprises a load and a dimmer for controlling the load, wherein the load and the dimmer are connected between a live wire and a zero wire of an alternating current source in series,

the dimmer is a pull rope dimmer, and when a pull rope of the pull rope dimmer is pulled, a micro switch in the pull rope dimmer is touched, so that the on/off/dimming of the load is controlled by recognizing the action of the micro switch through signals.

According to the invention of the scheme, the pull rope dimmer comprises a shell, a pull rope reverse swing piece, the pull rope, a transmission assembly and a dimming PCB assembly;

a first opening is arranged below the shell, and one end of the pull rope penetrates through the first opening and is slidably arranged in the shell;

the pull rope reverse swing piece is rotatably arranged in the shell;

the transmission assembly is arranged in the shell and is in transmission connection with the pull rope and the pull rope reverse swing piece;

the light-adjusting PCB assembly is arranged in the shell, the micro switch is arranged on the light-adjusting PCB assembly, and the micro switch is arranged on a rotating path of the pull rope reverse swing piece;

When the pull rope is pulled downwards, the pull rope drives the pull rope reverse swing piece to rotate around a central axis through the transmission assembly, so that the pull rope reverse swing piece is contacted with the micro switch, and different control signals are sent according to the contact time.

According to the invention of the scheme, the transmission assembly comprises a pull rope fixing seat, a pull rope sliding guide piece and a first return spring;

the pull rope fixing seat is arranged in the shell, a second opening is formed in the bottom of the pull rope fixing seat, a sliding groove and a rotating shaft are formed in the side wall of the pull rope fixing seat, and the pull rope reverse swing piece is rotatably arranged on the rotating shaft;

the pull rope sliding guide part is installed in the pull rope fixing seat, the pull rope penetrates through the second opening and is connected with the pull rope sliding guide part, a force arm is arranged on one side of the pull rope sliding guide part, one end of the force arm penetrates through the sliding groove and is driven by the pull rope to slide along the sliding groove, and one side of the pull rope reverse swing part is arranged on a sliding path of the force arm;

the first reset spring is installed in the pull rope fixing seat, one end of the first reset spring is connected with the pull rope sliding guide piece, the other end of the first reset spring is connected with the bottom of the pull rope fixing seat, and the pull rope penetrates through the first reset spring.

Furthermore, the pull rope reverse swing piece comprises a hollow rotating column, a first swing arm and a second swing arm, the hollow rotating column is rotatably sleeved on the rotating shaft, the first swing arm and the second swing arm are symmetrically arranged on two sides of the hollow rotating column, the first swing arm is arranged on a sliding path of the force arm, and the micro switch is arranged on a rotating path of the second swing arm.

Furthermore, one end of the rotating shaft, which is far away from the pull rope fixing seat, is provided with a blocking screw.

Furthermore, the shell comprises a top plate, an inner cover and an outer cover, the outer cover covers the inner cover and is connected with the top plate, and the pull rope reverse swing piece, the transmission assembly and the dimming PCB assembly are arranged in a space defined by the top plate and the inner cover.

Furthermore, the side wall of the stay cord fixing seat is provided with a hollow first fixing column with a screw hole, the top plate is provided with a second fixing column with a screw hole, the first fixing column is sleeved on the second fixing column, and the first fixing column and the second fixing column are fixed through a first screw.

Further, be equipped with first screw hole on the inner cup, be equipped with the second screw hole on the PCB subassembly of adjusting luminance, be equipped with the third screw hole on the roof, the second screw passes in proper order first screw hole the second screw hole reaches the third screw hole will the inner cup the PCB subassembly of adjusting luminance reaches the roof is fixed.

Furthermore, the top plate and the outer cover are circular, external threads are arranged on the outer side edge of the top plate, internal threads are arranged on the inner side edge of the outer cover, and the outer cover is fixed with the top plate through the internal threads and the external threads.

Further, the transmission assembly further comprises a rotating member and a second return spring;

the rotating part is rotatably arranged in the pull rope fixing seat and is positioned below the pull rope sliding guide part, a third opening is formed in the middle of the rotating part, the pull rope and the first return spring penetrate through the third opening to be connected with the pull rope sliding guide part, the rotating part is provided with rotating guide parts distributed along the circumferential direction of the third opening, and the pull rope sliding guide part is provided with a rotating guide seat matched with the rotating guide parts;

the second reset spring is installed in the pull rope fixing seat, one end of the second reset spring is connected with the rotating piece, the other end of the second reset spring is connected with the bottom of the pull rope fixing seat, and the pull rope and the first reset spring penetrate through the second reset spring.

Furthermore, a first guide inclined plane is arranged on the rotary guide piece, a second guide inclined plane is arranged on the rotary guide seat, and the inclination angles of the first guide inclined plane and the second guide inclined plane are the same.

According to the invention, the beneficial effects of the invention are as follows:

1. according to the invention, the pull rope is used for pulling the pull rope reverse swing piece to rotate, the micro switch on the dimming PCB assembly is touched, and different control signals are sent according to the time for touching the micro switch, so that the functions of turning on/off, dimming and the like of a load are realized;

2. the invention can be installed on the ceiling of each application place, the installation position is flexible, and the line does not need to be changed;

3. by adopting the transmission assembly, when the pull rope is pulled repeatedly, the force arm of the pull rope sliding guide part slides repeatedly, so that the pull rope reverse swing part is driven to rotate repeatedly by conduction, the rotation angle touches the microswitch conducted on the dimming PCB assembly, and the on-off state is circulated, so that the dimming of the whole dimming circuit is controlled; meanwhile, through the rotating piece and the two return springs, the pull rope can be pulled once to make a crisp sound once, and soft spring hand feeling is realized;

4. the invention adopts the structural design of the inner cover and the outer cover, and the outer cover can block the screws and the screw holes on the inner cover, thereby not only ensuring the structural stability of the product, but also ensuring the exquisite appearance of the product;

5. The invention adopts the internal and external thread mode to fix the top plate and the outer cover, thereby not only facilitating the assembly/disassembly of the product, but also further ensuring the exquisite appearance of the product.

Drawings

FIG. 1 is a wiring diagram of the pull cord post dimmer of the present invention;

FIG. 2 is an exploded view of the construction of the pull cord post dimmer of the present invention;

FIG. 3 is a schematic structural view of the pull cord post dimmer of the present invention;

FIG. 4 is a schematic view of the connection of the pull-cord reverse swing member, the transmission assembly and the dimming PCB assembly of the present invention;

FIG. 5 is a schematic view of the construction of the pull cord slide guide of the present invention;

FIG. 6 is a schematic view of a rotary member according to the present invention;

FIG. 7 is a schematic view of the reverse swinging member of the pull cord of the present invention;

FIG. 8 is a schematic structural view of a top plate according to the present invention;

FIG. 9 is a schematic view of the inner cap of the present invention with the terminal cap removed;

FIG. 10 is a schematic view of the structure of the outer cover of the present invention;

fig. 11 is a schematic structural view of the pull cord post dimmer of the present invention with the outer cover and the pull cord removed.

In the figures, the reference numerals are as follows:

1. a housing; 11. a first opening; 12. a top plate; 121. a second fixed column; 122. a third screw hole; 123. an external thread; 13. an inner cover; 131. a first screw hole; 132. a fourth opening; 133. a terminal groove; 134. a terminal cover; 135. a fifth opening; 14. an outer cover; 141. an internal thread;

2. A pull rope reverse swing piece; 21. a hollow spin column; 22. a first swing arm; 23. a second swing arm;

3. pulling a rope; 31. a drawing handle;

4. a transmission assembly; 41. a pull rope fixing seat; 411. a second opening; 412. a rotating shaft; 4121. a blocking screw; 413. a chute; 414. a first fixed column; 42. a pull cord slide guide; 421. a force arm; 422. rotating the guide seat; 4221. a second guide slope; 43. a first return spring; 44. a rotating member; 441. a third opening; 442. a rotating guide; 4421. a first guide slope; 45. a second return spring;

5. a dimming PCB assembly; 51. a microswitch; 52. finely adjusting a knob; 53. a wiring terminal; 54. a second screw hole;

6. a first screw;

7. a second screw.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

It should be noted that the terms "disposed," "connected," "installed," and the like are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected within and/or interacting with one another. The terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and should not be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features.

Referring to fig. 1, the present embodiment provides a novel pull-cord dimming system, which includes a load and a dimmer for controlling the load, the load and the dimmer are connected in series between a live line and a neutral line of an ac source, the dimmer is a pull-cord dimmer, when a pull cord 3 of the pull-cord dimmer is pulled, a micro switch 51 inside the pull-cord dimmer is touched, so as to control on/off/dimming of the load by recognizing an action of the micro switch 51 through a signal.

Referring to fig. 2 to 4, the pull cord dimmer includes a housing 1, a pull cord reverse swing member 2, a pull cord 3, a transmission assembly 4 and a dimming PCB assembly 5. A first opening 11 is arranged below the shell 1, one end of a pull rope 3 passes through the first opening 11 and is slidably mounted in the shell 1, the pull rope reverse swing piece 2 is rotatably mounted in the shell 1, a transmission component 4 is mounted in the shell 1 and is in transmission connection with the pull rope 3 and the pull rope reverse swing piece 2, the dimming PCB component 5 is mounted in the shell 1, a microswitch 51 is arranged on the dimming PCB component 5, the microswitch 51 is electrically connected with a dimming circuit on the dimming PCB component 5, and the microswitch 51 is arranged on a rotating path of the pull rope reverse swing piece 2; when the pull rope 3 is pulled downwards, the pull rope 3 drives the pull rope reverse swing piece 2 to rotate around a central axis through the transmission component 4, so that the pull rope reverse swing piece 2 is contacted with the micro switch 51, different control signals are sent to the dimming circuit according to the contact time, and functions of turning on/off, dimming and the like of a load are realized. Specifically, the software signal identifies the contact time of the pull rope reverse swing piece 2 and the micro switch 51, the dimming mode is started to achieve the purpose of dimming if the duration time is long, and the on-off state of the switch is changed if the duration time is short (the operation is only once until the inner spring sounds).

Referring to fig. 2, 4, 5 and 6, the transmission assembly 4 includes a pull rope fixing seat 41, a pull rope sliding guide 42, a first return spring 43, a rotating member 44 and a second return spring 45.

The pull rope fixing seat 41 is installed in the shell 1, the pull rope sliding guide 42 is installed in the pull rope fixing seat 41, the bottom of the pull rope fixing seat 41 is provided with a second opening 411, the pull rope 3 passes through the second opening 411 to be connected with the pull rope sliding guide 42, the side wall of the pull rope fixing seat 41 is provided with a rotating shaft 412, and the pull rope reverse swinging piece 2 is rotatably installed on the rotating shaft 412; a sliding groove 413 is formed in the side wall of the pull rope fixing seat 41, a force arm 421 is arranged on one side of the pull rope sliding guide 42, one end of the force arm 421 penetrates through the sliding groove 413, the pull rope 3 is driven to slide along the sliding groove 413, and one side of the pull rope reverse swinging member 2 is arranged on a sliding path of the force arm 421; when the pulling rope 3 is pulled downwards, the force arm 421 slides along the sliding slot 413, and when the force arm 421 touches the pulling rope reverse swinging member 2, the force arm 421 drives the pulling rope reverse swinging member 2 to rotate around the rotating shaft 412, so that the pulling rope reverse swinging member 2 touches the micro switch 51.

The first return spring 43 is installed in the pull rope fixing seat 41, one end of the first return spring 43 is connected with the pull rope sliding guide 42, the other end of the first return spring 43 is connected with the bottom of the pull rope fixing seat 41, and the pull rope 3 passes through the first return spring 43; when the pulling rope 3 is pulled downward, the rope slide guide 42 slides downward and compresses the first return spring 43, and the first return spring 43 generates an elastic force; after releasing the pull rope 3, the pull rope slide guide 42 is returned by the elastic force of the first return spring 43.

The rotating member 44 is rotatably installed in the rope fixing seat 41 and located below the rope sliding guide 42, a third opening 441 is formed in the middle of the rotating member 44, the rope 3 and the first return spring 43 pass through the third opening 441 to be connected to the rope sliding guide 42, the rotating member 44 is provided with rotating guide members 442 circumferentially distributed along the third opening 441, the rope sliding guide 42 is provided with a rotating guide seat 422 matched with the rotating guide member 442, and when the rope sliding guide 42 slides downward, the rotating member 44 is driven by the rotating guide member 442 and the rotating guide seat 422 to rotate around the rope 3 and slide downward along with the rope sliding guide 42.

The second return spring 45 is installed in the shell 1, one end of the second return spring 45 is connected with the rotating piece 44, the other end of the second return spring 45 is connected with the bottom of the pull rope fixing seat 41, and the pull rope 3 and the first return spring 43 pass through the second return spring 45; when the pulling rope 3 is pulled downwards, the rotating member 44 slides downwards along with the pulling rope sliding guide 42, the first return spring 43 and the second return spring 45 are compressed along with the sliding of the pulling rope sliding guide 42 and the rotating member 44 to generate elastic force, and the rotating member 44 is matched with the rotating guide 442 and the rotating guide seat 422 to rotate under the elastic force of the first return spring 43 and the second return spring 45; after the pulling rope 3 is released, the rotating member 44 is returned by the elastic force of the first return spring 43 and the second return spring 45 in cooperation with the rotating guide 442 and the rotating guide 422, and makes a crisp sound and realizes a soft spring touch.

By adopting the transmission component 4, when the pull rope 3 is repeatedly pulled, the force arm 421 of the pull rope sliding guide component 42 repeatedly slides, so that the pull rope reverse swing component 2 is driven to repeatedly rotate by conduction, the rotation angle is touched and conducted to the micro switch 51 on the dimming PCB component 5, and the dimming of the whole dimming circuit is controlled by the cycle of the on-off state.

Referring to fig. 7, the pull rope reverse swing element 2 includes a hollow rotation post 21, a first swing arm 22 and a second swing arm 23, the hollow rotation post 21 is rotatably sleeved on the rotation shaft 412, the first swing arm 22 and the second swing arm 23 are symmetrically disposed on two sides of the hollow rotation post 21, the first swing arm 22 is disposed on a sliding path of the force arm 421, the micro switch 51 is disposed on a rotating path of the second swing arm 23, when the force arm 421 slides downward along the sliding groove 413, the force arm 421 touches the first swing arm 22, and drives the first swing arm 22 and the second swing arm 23 to rotate around the rotation shaft 412, so that the second swing arm 23 touches the micro switch 51.

Referring to fig. 2 and 4, a stop screw 4121 is disposed at an end of the rotating shaft 412 away from the pull rope fixing seat 41 to prevent the rotating member 44 from falling off from the rotating shaft 412 during rotation.

Referring to fig. 5 and 6, the first guiding inclined plane 4421 is disposed on the rotation guiding element 442, the second guiding inclined plane 4221 is disposed on the rotation guiding seat 422, and the inclination angles of the first guiding inclined plane 4421 and the second guiding inclined plane 4221 are the same, so that when the rotation element 44 slides along with the rope sliding guiding element 42, the rotation element 44 rotates under the action of the first guiding inclined plane 4421 and the second guiding inclined plane 4221.

Referring to fig. 4, the dimming PCB assembly 5 is further provided with a fine adjustment knob 52 and a connection terminal 53, the fine adjustment knob 52 and the connection terminal 53 are both electrically connected to the dimming circuit on the dimming PCB assembly 5, the fine adjustment knob 52 is used for fine adjustment of the minimum brightness of the light source, and the connection terminal 53 is used for connecting the circuit.

Referring to fig. 2, 8, 9 and 10, the housing 1 includes a top plate 12, an inner lid 13 and an outer lid 14, the outer lid 14 covers the inner lid 13 and is connected to the top plate 12, and the pull string reverse swing member 2, the transmission member 4 and the dimming PCB assembly 5 are installed in a space defined by the top plate 12 and the inner lid 13. The side wall of the pull rope fixing seat 41 is provided with a hollow first fixing column 414 with a screw hole, the top plate 12 is provided with a second fixing column 121 with a screw hole, the first fixing column 414 is sleeved on the second fixing column 121, and the first fixing column 414 and the second fixing column 121 are fixed through a first screw 6. Be equipped with first screw hole 131 on the inner cup 13, be equipped with second screw hole 54 on the PCB subassembly 5 of adjusting luminance, be equipped with third screw hole 122 on roof 12, first screw hole 131, second screw hole 54 and third screw hole 122 are passed in proper order to second screw 7, and is fixed with inner cup 13, PCB subassembly 5 and roof 12 of adjusting luminance. By adopting the structural design of the inner cover and the outer cover, the outer cover 14 can block screws and screw holes on the inner cover 13, thereby not only ensuring the structural stability of the product, but also ensuring the exquisite appearance of the product.

Referring to fig. 8 and 10, the top plate 12 and the outer lid 14 are circular, the outer edge of the top plate 12 is provided with an external thread 123, the inner edge of the outer lid 14 is provided with an internal thread 141, and the outer lid 14 is fixed to the top plate 12 through the internal thread 141 and the external thread 123. The top plate 12 and the outer cover 14 are fixed by the inner and outer threads 123, which not only facilitates the assembly/disassembly of the product, but also further ensures the exquisite appearance of the product.

Referring to fig. 9 and 11, the inner lid 13 is further provided with a fourth opening 132 matching with the fine adjustment knob 52, and the adjustment end of the fine adjustment knob 52 is disposed in the fourth opening 132. With the above arrangement, when the minimum brightness of the light source needs to be finely adjusted, the adjustment can be performed by the fine adjustment knob 52 by only twisting the outer cover 14, without detaching the inner cover 13.

Referring to fig. 2 and 9, the inner lid 13 is further provided with a terminal groove 133 and a terminal cover 134, the terminal cover 134 is clamped on the terminal groove 133, the terminal groove 133 is provided with a fifth opening 135 matched with the connection terminal 53, when a connection is required, the terminal cover 134 is opened, and the circuit can be connected with the connection terminal 53 through the fifth opening 135.

Referring to fig. 2, a pulling handle 31 is disposed at an end of the pull rope 3 away from the housing 1, so that a person can pull the pull rope 3 with his hand.

It will be appreciated that modifications and variations are possible to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.

The invention is described above with reference to the accompanying drawings, which are illustrative, and it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and technical solution, or to apply the inventive concept and technical solution to other fields without modification.

Claims (9)

1. A novel pull rope dimming system comprises a load and a dimmer for controlling the load, wherein the load and the dimmer are connected in series between a live wire and a zero wire of an alternating current source,

the light modulator is a pull rope light modulator which comprises a shell, a pull rope reverse swing piece, a pull rope, a transmission assembly and a light modulation PCB assembly;

the dimming PCB assembly is arranged in the shell, a microswitch is arranged on the dimming PCB assembly, and the microswitch is electrically connected with a dimming circuit on the dimming PCB assembly;

the transmission assembly comprises a pull rope fixing seat and a pull rope sliding guide piece;

the pull rope sliding guide piece is arranged in the pull rope fixing seat, and a rotating shaft is arranged on the side wall of the pull rope fixing seat;

a sliding groove is formed in the side wall of the pull rope fixing seat, a force arm is arranged on one side of the pull rope sliding guide piece, and one end of the force arm penetrates through the sliding groove and is driven by the pull rope to slide along the sliding groove;

The pull rope reverse swing piece comprises a hollow rotating column, a first swing arm and a second swing arm, the hollow rotating column is rotatably sleeved on the rotating shaft, the first swing arm and the second swing arm are symmetrically arranged on two sides of the hollow rotating column, the first swing arm is arranged on a sliding path of the force arm, and the microswitch is arranged on a rotating path of the second swing arm;

when the pull rope is pulled, the pull rope reverse swing piece touches the micro switch, and different control signals are sent to the light adjusting circuit according to the touching time length, so that the on/off and light adjusting functions of the load are realized.

2. The novel pull-cord dimming system of claim 1, wherein a first opening is provided below the housing, and wherein one end of the pull cord passes through the first opening and is slidably mounted in the housing;

when the pull rope is pulled downwards, the pull rope drives the pull rope reverse swing piece to rotate around a central axis through the transmission assembly, so that the pull rope reverse swing piece is contacted with the microswitch.

3. The pull-cord dimming system of claim 2, wherein the transmission assembly further comprises a first return spring;

The pull rope fixing seat is arranged in the shell, and a second opening is formed in the bottom of the pull rope fixing seat; the pull rope penetrates through the second opening and is connected with the pull rope sliding guide piece;

the first reset spring is installed in the pull rope fixing seat, one end of the first reset spring is connected with the pull rope sliding guide piece, the other end of the first reset spring is connected with the bottom of the pull rope fixing seat, and the pull rope penetrates through the first reset spring.

4. The novel pull rope dimming system as claimed in claim 3, wherein the end of the rotating shaft away from the pull rope fixing seat is provided with a blocking screw.

5. The novel pull rope dimming system according to claim 3, wherein the housing comprises a top plate, an inner cover and an outer cover, the outer cover covers the inner cover and is connected with the top plate, and the pull rope reverse swing piece, the transmission assembly and the dimming PCB assembly are arranged in a space defined by the top plate and the inner cover.

6. The novel pull rope dimming system as claimed in claim 5, wherein a hollow first fixing column with a screw hole is provided on a side wall of the pull rope fixing base, a second fixing column with a screw hole is provided on the top plate, the first fixing column is sleeved on the second fixing column, and the first fixing column and the second fixing column are fixed through a first screw.

7. The novel pull rope dimming system according to claim 5, wherein a first screw hole is formed in the inner cover, a second screw hole is formed in the dimming PCB assembly, a third screw hole is formed in the top plate, and a second screw passes through the first screw hole, the second screw hole and the third screw hole in sequence to fix the inner cover, the dimming PCB assembly and the top plate.

8. The novel pull rope dimming system as claimed in claim 5, wherein the top plate and the outer cover are circular, the outer edge of the top plate is provided with an external thread, the inner edge of the outer cover is provided with an internal thread, and the outer cover is fixed with the top plate through the internal thread and the external thread.

9. The pull-cord dimming system of claim 3, wherein the transmission assembly further comprises a rotating member and a second return spring;

the rotating part is rotatably arranged in the pull rope fixing seat and is positioned below the pull rope sliding guide part, a third opening is formed in the middle of the rotating part, the pull rope and the first return spring penetrate through the third opening to be connected with the pull rope sliding guide part, the rotating part is provided with rotating guide parts distributed along the circumferential direction of the third opening, and the pull rope sliding guide part is provided with a rotating guide seat matched with the rotating guide parts;

The second reset spring is installed in the pull rope fixing seat, one end of the second reset spring is connected with the rotating piece, the other end of the second reset spring is connected with the bottom of the pull rope fixing seat, and the pull rope and the first reset spring penetrate through the second reset spring.

Images