An electric lifting window capable of adjusting light transmittance

Abstract

The present invention relates to the field of window technology, and in particular to an electric lifting window capable of adjusting light transmittance, comprising: a window frame and two window doors, wherein one of the window door side walls is fixedly connected to the inner side wall of the window frame, the inner wall of the window frame is equipped with two electric slide rails, a slider is installed on the electric slide rail, the slider side wall is fixedly connected to the other window door side wall, the two window door side walls are fitted together, and the two window door inner side walls are fixedly connected with glass; a dimming mechanism, wherein the dimming mechanism comprises a first cavity opened above the window door side wall, and a second cavity is opened below the window door side wall. The present invention is provided with a dimming mechanism, and when the second rod drives the second roller to rotate clockwise, it can drive a light-transmitting film to move downward and wrap around it, and at this time, the light-transmitting film moves from top to bottom, and the light transmittance on the light-transmitting film will gradually decrease, and then the light from the outside sunlight shining into the room through the glass will gradually weaken.

Description

Technical Field

[0001] The invention relates to the technical field of windows, and in particular to an electric lifting window capable of adjusting light transmittance. Background Art

[0002] The electric lift window is a modern window design that opens and closes through an electric mechanical system. It can be automatically controlled by a remote control, smartphone application or sensor, providing a convenient operation method, allowing users to remotely operate the opening and closing of the window.

[0003] In the prior art, in order to achieve shading for windows when the sun is strong in the summer, blinds or sunshades are installed on the windows to adjust the light transmittance of the windows. However, this method requires the user to adjust it autonomously, which reduces its intelligent operability. Although this method can adjust the light transmittance of the windows, installing blinds or sunshades on the windows not only increases the cost of installing the windows, but also affects the aesthetics of the windows. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose an electric lifting window capable of adjusting light transmittance.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An electric lifting window capable of adjusting light transmittance, comprising:

[0007] A window frame and two windows and doors, wherein one of the side walls of the window and door is fixedly connected to the inner side wall of the window frame, two electric slide rails are installed on the inner wall of the window frame, a slider is installed on the electric slide rail, the side wall of the slider is fixedly connected to the other side wall of the window and door, the two side walls of the window and door fit together, and both inner side walls of the window and door are fixedly connected to glass;

[0008] A dimming mechanism, the dimming mechanism includes a first cavity opened above the side wall of the window and door, a second cavity opened below the side wall of the window and door, the inner wall of the first cavity is rotatably connected to a first roller via a first rod, the inner wall of the second cavity is rotatably connected to a second roller via a second rod, a light-transmitting film is wound between the first roller and the second roller, and the side wall of the light-transmitting film is bonded to the glass side wall.

[0009] Preferably, the light transmittance of the light-transmitting film increases gradually from top to bottom.

[0010] Preferably, the window door is provided with a rotating mechanism for driving the first rod and the second rod to rotate respectively, the rotating mechanism includes a first one-way bearing and a second one-way bearing, a strip cavity is provided in the window door, the inner wall of the strip cavity is rotatably connected with a third rod, the side wall of the third rod is fixedly connected to the side wall of the inner ring of the first one-way bearing, the side wall of the third rod is fixedly connected to the side wall of the inner ring of the second one-way bearing, the side wall of the outer ring of the first one-way bearing is fixedly connected to the first wheel, the side wall of the outer ring of the second one-way bearing is fixedly connected to the second wheel, the inner wall of the strip cavity is communicated with the inner walls of the first cavity and the second cavity respectively, the side wall of the first rod is fixedly connected to the third wheel, the side wall of the second rod is fixedly connected to the fourth wheel, a synchronous belt is connected between the first wheel and the third wheel, and a synchronous belt is connected between the second wheel and the fourth wheel.

[0011] Preferably, the window door is provided with a driving mechanism for driving the third rod to rotate, and the driving mechanism includes a driving cavity opened in the window door, two first plates are slidably connected to the inner wall of the driving cavity, a tooth plate is fixedly connected between the two first plates, one end of the third rod passes through the inner wall of the window door and is rotatably connected to the inner wall of the driving cavity, and the side wall of the third rod located in the driving cavity is fixedly connected to a gear meshing with the tooth plate.

[0012] Preferably, the lower end of the first plate located at the bottom is elastically connected to the bottom of the driving cavity through a plurality of magnetic springs, and the upper end of the first plate located at the top is elastically connected to the top of the driving cavity through a plurality of return springs.

[0013] Preferably, a sealed box is embedded in the side wall of the window and door, a transparent plate is installed on the inner wall of the sealed box, a photoresistor is fixedly connected to the side wall of the transparent plate located inside the sealed box, an extrusion switch is installed on the inner wall on the same side of the sealed box and the transparent plate, and the magnetic spring, photoresistor and extrusion switch are electrically connected to an external power supply.

[0014] Preferably, the inner wall of the sealed box is sealed and slidably connected with a second plate, the side wall of the second plate away from the transparent plate is elastically connected to the inner wall of the sealed box through a plurality of telescopic springs, a sensing cavity is formed between the side wall of the second plate away from the transparent plate and the inner wall of the sealed box, an expansion medium is provided in the sensing cavity, the second plate is fixedly connected to the side wall close to the transparent plate with two limit plates, one of the limit plates is directly opposite to the extrusion switch.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1: A dimming mechanism is set up. When the second rod drives the second roller to rotate clockwise, it can drive the light-transmitting film to move downward and wrap around it. At this time, the light-transmitting film moves from top to bottom, and the light transmittance on the light-transmitting film will gradually decrease, and the light from the outside sunlight shining into the room through the glass will gradually weaken. The side wall of the light-transmitting film is fitted with the side wall of the glass and can be regarded as an integral whole, avoiding the use of blinds or sunshades in the prior art to adjust the light transmittance of the window, which not only increases the cost consumption after the window is installed, but also affects the aesthetics of the window.

[0017] 2: The rotating mechanism and the driving mechanism are provided to realize the autonomous adjustment of the light transmittance of the glass, which does not require the user to make autonomous adjustments as in the prior art, thus reducing the intelligent operability.

[0018] 3: Set up an induction cavity so that when the sunlight is strong and the temperature is high enough in summer, the magnetic spring can be energized automatically to adjust the light transmittance of the glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of an electric lifting window capable of adjusting light transmittance proposed by the present invention;

[0020] Figure 2 for Figure 1 A vertical cross-sectional structural diagram after removing the window frame;

[0021] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at the center A;

[0022] Figure 4 for Figure 1 A rear view structural diagram of ;

[0023] Figure 5 for Figure 1 A vertical cross-sectional structural diagram of the central dimming mechanism;

[0024] Figure 6 for Figure 2 A schematic diagram of the structure enlarged at B in the middle;

[0025] Figure 7 for Figure 2 A schematic diagram of the structure enlarged at C in the middle;

[0026] Figure 8 It is a vertical cross-sectional structural diagram of the drive cavity and the sealing box at the window and door;

[0027] Fig. 9 for Figure 8 A schematic diagram of the structure at D in the middle is enlarged;

[0028] Fig.10It is a structural schematic diagram of the dimming mechanism, the rotating mechanism and the driving mechanism.

[0029] In the figure: 1. window frame; 2. window door; 3. electric slide rail; 4. slider; 5. glass; 6. first cavity; 7. second cavity; 8. first rod; 9. first roller; 10. second rod; 11. second roller; 12. light-transmitting film; 13. strip cavity; 14. third rod; 15. first one-way bearing; 16. second one-way bearing; 17. first wheel; 18. second wheel; 19. third wheel; 20. fourth wheel; 21. driving cavity; 22. first plate; 23. tooth plate; 24. gear; 25. magnetic spring; 26. reset spring; 27. sealing box; 28. transparent plate; 29. ​​photoresistor; 30. squeeze switch; 31. second plate; 32. induction cavity; 33. telescopic spring; 34. limit plate. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Reference Figure 1-Figure 10 An electric lifting window capable of adjusting light transmittance comprises a window frame 1 and two window doors 2, wherein a side wall of one of the window doors 2 is fixedly connected to an inner wall of the window frame 1, two electric slide rails 3 are installed on the inner wall of the window frame 1, and a slider 4 is installed on the electric slide rail 3. The two sliders 4 can be driven up and down by the two electric slide rails 3 to drive the window door 2 connected to the slider 4 to move and partially open the window frame 1. The driving method is the existing technology, the side wall of the slider 4 is fixedly connected to the side wall of the other window door 2, the side walls of the two window doors 2 are fitted together, and the inner walls of the two window doors 2 are fixedly connected with glass 5.

[0032] The dimming mechanism includes a first cavity 6 opened above the side wall of the window door 2, a second cavity 7 opened below the side wall of the window door 2, the inner wall of the first cavity 6 is rotatably connected to a first roller 9 through a first rod 8, the inner wall of the second cavity 7 is rotatably connected to a second roller 11 through a second rod 10, a light-transmitting film 12 is wound between the first roller 9 and the second roller 11, and the side wall of the light-transmitting film 12 is in contact with the side wall of the glass 5.

[0033] The light transmittance on the transparent film 12 gradually increases from top to bottom. The light transmittance can be set by setting different thicknesses of the light-isolating layer on the surface of the transparent film 12. This is a prior art, so that when the second rod 10 drives the second roller 11 to rotate clockwise (such as Figure 5As shown in the figure, the light-transmitting film 12 can be driven to move downward and wrap around it. At this time, the light-transmitting film 12 moves from top to bottom, and the light transmittance on the light-transmitting film 12 will gradually decrease, and the light from the outside sunlight shining into the room through the glass 5 will gradually weaken. The side wall of the light-transmitting film 12 is in contact with the side wall of the glass 5 and can be regarded as an integral whole, avoiding the use of blinds or sunshades in the prior art to adjust the light transmittance of the window, which not only increases the cost consumption after the window is installed, but also affects the aesthetics of the window.

[0034] The window door 2 is provided with a rotating mechanism for driving the first rod 8 and the second rod 10 to rotate respectively, and the rotating mechanism includes a first one-way bearing 15 and a second one-way bearing 16. A strip cavity 13 is provided in the window door 2, and the inner wall of the strip cavity 13 is rotatably connected with the third rod 14, the side wall of the third rod 14 is fixedly connected to the inner ring side wall of the first one-way bearing 15, the side wall of the third rod 14 is fixedly connected to the inner ring side wall of the second one-way bearing 16, the outer ring side wall of the first one-way bearing 15 is fixedly connected with a first wheel 17, the outer ring side wall of the second one-way bearing 16 is fixedly connected with a second wheel 18, the inner wall of the strip cavity 13 is communicated with the inner walls of the first cavity 6 and the second cavity 7 respectively, the side wall of the first rod 8 is fixedly connected with the third wheel 19, the side wall of the second rod 10 is fixedly connected with the fourth wheel 20, a synchronous belt is connected between the first wheel 17 and the third wheel 19, and a synchronous belt is connected between the second wheel 18 and the fourth wheel 20.

[0035] The window door 2 is provided with a driving mechanism for driving the third rod 14 to rotate, and the driving mechanism includes a driving cavity 21 opened in the window door 2, and two first plates 22 are slidably connected to the inner wall of the driving cavity 21, and a tooth plate 23 is fixedly connected between the two first plates 22. One end of the third rod 14 passes through the inner wall of the window door 2 and is rotatably connected to the inner wall of the driving cavity 21. The side wall of the third rod 14 located in the driving cavity 21 is fixedly connected to a gear 24 meshing with the tooth plate 23.

[0036] like Figure 3 , Figure 6 and Figure 7 As shown, when the tooth plate 23 moves downward, the gear 24 drives the third rod 14 to rotate clockwise. At this time, the inner ring of the first one-way bearing 15 does not drive its outer ring to rotate, and the inner ring of the second one-way bearing 16 drives its outer ring to rotate, and then drives the second rod 10 to rotate clockwise through the second wheel 18, the synchronous belt and the fourth wheel 20, drives the second roller 11 to rotate clockwise, drives the light-transmitting film 12 to move downward and wrap around it, so that the light transmittance of the glass 5 decreases;

[0037] When the toothed plate 23 moves upward, the gear 24 drives the third rod 14 to rotate counterclockwise. At this time, the inner ring of the first one-way bearing 15 drives its outer ring to rotate, and the inner ring of the second one-way bearing 16 does not drive its outer ring to rotate, and then the first rod 8 is driven to rotate counterclockwise through the first wheel 17, the synchronous belt and the third wheel 19, and the first roller 9 is driven to rotate counterclockwise, and the light-transmitting film 12 is driven to move upward and wrap around it, so that the light transmittance of the glass 5 is increased;

[0038] In addition, when the third rod 14 rotates to drive the first rod 8 to rotate counterclockwise, the outer ring of the second one-way bearing 16 rotates counterclockwise without affecting the rotation of its inner ring. When the third rod 14 rotates to drive the second rod 10 to rotate clockwise, the outer ring of the first one-way bearing 15 rotates clockwise without affecting the rotation of its inner ring.

[0039] The lower end of the first plate 22 located at the bottom is elastically connected to the bottom of the driving cavity 21 through multiple magnetic springs 25, and the upper end of the first plate 22 located at the top is elastically connected to the top of the driving cavity 21 through multiple return springs 26.

[0040] After the multiple magnetic springs 25 are energized, due to electromagnetic induction, the magnetic springs 25 interact with the current in the external magnetic field to generate pulling forces of different magnitudes to control the tensile deformation and movement state of the magnetic springs 25, and the pulling force is controlled according to the magnitude of the current flowing through, which is a prior art. Furthermore, under the elastic force of the multiple magnetic springs 25 and the multiple return springs 26, the position of the tooth plate 23 can be kept stable.

[0041] A sealing box 27 is embedded in the side wall of the window door 2, a transparent plate 28 is installed on the inner wall of the sealing box 27, a photoresistor 29 is fixedly connected to the side wall of the transparent plate 28 located inside the sealing box 27, a squeeze switch 30 is installed on the inner wall on the same side of the sealing box 27 and the transparent plate 28, and the magnetic spring 25, the photoresistor 29 and the squeeze switch 30 are electrically connected to an external power supply.

[0042] It should be noted that the resistance of the photoresistor 29 decreases with the increase of the received light intensity, which is the prior art. Therefore, when the external sunlight is stronger, the resistance on the photoresistor 29 is smaller, and the resistance in the circuit connected to the magnetic spring 25 is smaller, so that the current flowing through the magnetic spring 25 is larger, and the pulling force generated on the magnetic spring 25 is larger, and the distance that the tooth plate 23 moves downward is larger, so that the second roller 11 rotates more clockwise, and the light-transmitting film 12 is driven to move downward more, and the transmittance of the glass 5 is reduced more, thereby realizing the autonomous adjustment of the transmittance of the glass 5, and there is no need for the user to adjust autonomously as in the prior art, which reduces the intelligent operability.

[0043] The inner wall of the sealed box 27 is sealed and slidably connected with a second plate 31. The side wall of the second plate 31 away from the transparent plate 28 is elastically connected to the inner wall of the sealed box 27 through multiple telescopic springs 33. A sensing cavity 32 is formed between the side wall of the second plate 31 away from the transparent plate 28 and the inner wall of the sealed box 27. An expansion medium is provided in the sensing cavity 32. The second plate 31 is fixedly connected to the side wall close to the transparent plate 28 with two limit plates 34, and one of the limit plates 34 is directly opposite to the extrusion switch 30.

[0044] Furthermore, the transparent plate 28 is arranged outdoors, and an air hole is provided on the inner wall of the sealed box 27 close to the outdoors to balance the pressure change in the sealed box 27 during the sliding process of the second plate 31, and the expansion medium is a dichloromethane solution with a boiling point of 39.75°C. When the sunlight is strong and the temperature is high enough in summer, the dichloromethane solution evaporates rapidly due to the heat, so that the pressure in the sensing cavity 32 increases, driving the second plate 31 to move closer to the transparent plate 28. At this time, the movement of the limit plate 34 can press the extrusion switch 30, and the circuit on the magnetic spring 25 is turned on. Then, when the sunlight is strong and the temperature is high enough in summer, the transmittance on the glass 5 can be adjusted autonomously, and the limit plate 34 prevents the second plate 31 from contacting and extruding the photoresistor 29.

[0045] It should be noted that the inner wall of the sealing box 27 is sealed and slidably connected to the side wall of the second plate 31, which can ensure the sealing of the sensing cavity 32 so that the dichloromethane solution in the sensing cavity 32 will not leak out.

[0046] When the electric lifting window is in use, the two transparent plates 28 are located outdoors. When in use, the two electric slide rails 3 can drive the two sliders 4 to move up and down, driving the window door 2 connected to the sliders 4 to move and partially open the window frame 1. The driving method is the existing technology.

[0047] In summer, when the sun is strong and the temperature is high enough, the user will close the window frame 1 for sunshade and heat insulation, so that the two windows 2 are in the initial state;

[0048] At this time, the expansion medium in the sensing chamber 32 is heated and evaporates rapidly, causing the pressure in the sensing chamber 32 to increase, driving the second plate 31 to move closer to the transparent plate 28, and the movement of the limit plate 34 can press the squeeze switch 30, thereby connecting the circuit on the magnetic spring 25;

[0049] As the sunlight is stronger, the resistance on the photoresistor 29 is smaller, and the resistance in the circuit connected to the magnetic spring 25 is smaller, so that the current flowing through the magnetic spring 25 is larger, and the pulling force generated on the magnetic spring 25 is larger, and the pulling force generated on the magnetic spring 25 is sufficient to overcome the elastic force of the reset spring 26, and the gear plate 23 is driven to move downward. The greater the distance, the more clockwise rotations the gear 24 drives the third rod 14. At this time, the inner ring of the first one-way bearing 15 does not drive its outer ring to rotate, and the inner ring of the second one-way bearing 16 drives its outer ring to rotate, and then the second rod 10 is driven to rotate clockwise through the second wheel 18, the synchronous belt and the fourth wheel 20. The more clockwise rotations, the more clockwise rotations the second roller 11 is driven, and the more the size of the light-transmitting film 12 is driven to move downward to wrap around it;

[0050] Since the light transmittance on the light-transmitting film 12 gradually increases from top to bottom, and as the light-transmitting film 12 moves downward further, the light transmittance on the light-transmitting film 12 will gradually decrease, and the light from the outside sun shining into the room through the glass 5 will gradually weaken. The side wall of the light-transmitting film 12 is attached to the side wall of the glass 5 and can be regarded as an integral body, avoiding the use of blinds or sunshades in the prior art to adjust the light transmittance of the window, which not only increases the cost consumption after the window is installed, but also affects the appearance of the window. In addition, the user does not need to make independent adjustments in the prior art, which reduces the intelligent operability;

[0051] When the temperature drops due to low sunlight, the expansion medium dissipates heat, so that the gaseous expansion medium gradually returns to a liquid expansion medium, and the pressure in the sensing chamber 32 decreases. At this time, under the elastic force of the multiple telescopic springs 33, the second plate 31 is driven to move away from the transparent plate 28. When the limit plate 34 moves and separates from the extrusion switch 30, the circuit on the magnetic spring 25 is disconnected. At this time, under the action of the multiple reset springs 26, the gear plate 23 is driven to move upward to the initial position. At this time, the gear 24 drives the third rod 14 to rotate counterclockwise. At this time, the inner ring of the first one-way bearing 15 drives its outer ring to rotate, and the inner ring of the second one-way bearing 16 does not drive its outer ring to rotate, and then the first rod 8 is driven to rotate counterclockwise through the first wheel 17, the synchronous belt and the third wheel 19, and the first roller 9 is driven to rotate counterclockwise to the initial position, and the light-transmitting film 12 is driven to move upward to wrap around it, so that the light-transmitting film 12 is located at the initial position, so that the light transmittance of the glass 5 is restored to the initial position.

[0052] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electric lifting window capable of adjusting light transmittance, characterized in that: include: A window frame (1) and two windows (2), wherein a side wall of one of the windows (2) is fixedly connected to an inner wall of the window frame (1), two electric slide rails (3) are installed on the inner wall of the window frame (1), a slider (4) is installed on the electric slide rail (3), a side wall of the slider (4) is fixedly connected to a side wall of another window (2), the side walls of the two windows (2) are fitted together, and the inner walls of the two windows (2) are fixedly connected to glass (5); A dimming mechanism, the dimming mechanism comprising a first cavity (6) opened above the side wall of the window (2), a second cavity (7) opened below the side wall of the window (2), the inner wall of the first cavity (6) being rotatably connected to a first roller (9) via a first rod (8), the inner wall of the second cavity (7) being rotatably connected to a second roller (11) via a second rod (10), a light-transmitting film (12) being wound between the first roller (9) and the second roller (11), and the side wall of the light-transmitting film (12) being in contact with the side wall of the glass (5); The light transmittance of the light-transmitting film (12) gradually increases from top to bottom; The window door (2) is provided with a rotating mechanism for driving the first rod (8) and the second rod (10) to rotate respectively, the rotating mechanism comprising a first one-way bearing (15) and a second one-way bearing (16), a strip-shaped cavity (13) is provided inside the window door (2), the inner wall of the strip-shaped cavity (13) is rotatably connected with a third rod (14), the side wall of the third rod (14) is fixedly connected to the inner ring side wall of the first one-way bearing (15), the side wall of the third rod (14) is fixedly connected to the inner ring side wall of the second one-way bearing (16), and the first one-way bearing ( 15) The outer ring side wall is fixedly connected to a first wheel (17), the outer ring side wall of the second one-way bearing (16) is fixedly connected to a second wheel (18), the inner wall of the strip-shaped cavity (13) is respectively connected to the inner walls of the first cavity (6) and the second cavity (7), the side wall of the first rod (8) is fixedly connected to a third wheel (19), the side wall of the second rod (10) is fixedly connected to a fourth wheel (20), a synchronous belt is connected between the first wheel (17) and the third wheel (19), and a synchronous belt is connected between the second wheel (18) and the fourth wheel (20); The window door (2) is provided with a driving mechanism for driving the third rod (14) to rotate, the driving mechanism comprising a driving cavity (21) opened in the window door (2), two first plates (22) are slidably connected to the inner wall of the driving cavity (21), a tooth plate (23) is fixedly connected between the two first plates (22), one end of the third rod (14) passes through the inner wall of the window door (2) and is rotatably connected to the inner wall of the driving cavity (21), and a gear (24) meshing with the tooth plate (23) is fixedly connected to the side wall of the third rod (14) located in the driving cavity (21).

2. The electric lift window capable of adjusting light transmittance according to claim 1, characterized in that: The lower end of the first plate (22) located at the bottom is elastically connected to the bottom of the driving cavity (21) via a plurality of magnetic springs (25), and the upper end of the first plate (22) located at the top is elastically connected to the top of the driving cavity (21) via a plurality of return springs (26).

3. The electric lift window capable of adjusting light transmittance according to claim 2, characterized in that: A sealing box (27) is embedded in the side wall of the window door (2), a transparent plate (28) is installed on the inner wall of the sealing box (27), a photoresistor (29) is fixedly connected to the side wall of the transparent plate (28) located inside the sealing box (27), a squeeze switch (30) is installed on the inner wall on the same side of the sealing box (27) and the transparent plate (28), and the magnetic spring (25), the photoresistor (29) and the squeeze switch (30) are electrically connected to an external power supply.

4. The electric lift window capable of adjusting light transmittance according to claim 3, characterized in that: The inner wall of the sealing box (27) is sealingly and slidably connected with a second plate (31); the side wall of the second plate (31) away from the transparent plate (28) is elastically connected to the inner wall of the sealing box (27) via a plurality of telescopic springs (33); a sensing cavity (32) is formed between the side wall of the second plate (31) away from the transparent plate (28) and the inner wall of the sealing box (27); an expansion medium is provided in the sensing cavity (32); the side wall of the second plate (31) close to the transparent plate (28) is fixedly connected with two limit plates (34); one of the limit plates (34) is directly opposite to the squeeze switch (30).

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