Anti-falling elevator car structure

Abstract

The invention relates to the technical field of elevator safety, in particular to an anti-falling elevator car structure which comprises a rail and rollers arranged on a car body, a first support is fixed to the car body, a guide wheel is arranged on the first support, the anti-falling elevator car structure further comprises a trigger mechanism arranged on the upper portion of the car body, and the guide wheel is arranged on the trigger mechanism. One end of the steel rope is fixedly connected with the car body and then penetrates through the guide wheel and the trigger mechanism; the supporting mechanism and the triggering mechanism are arranged at the bottom of the lift car body, the triggering mechanism is in transmission connection with the supporting mechanism, and a plurality of supporting plates which are horizontally and transversely arranged are fixed to the rails from bottom to top at equal intervals; and the stopping mechanism is arranged in the middle of the lift car body, the supporting mechanism is connected with the stopping mechanism through a pipeline, and the stopping mechanism is used for stopping the rolling wheels. According to the anti-falling elevator car structure, double safety protection measures are achieved, the car body is prevented from falling off, the operation safety of an elevator is greatly improved, and repeated utilization can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator safety, and in particular to an anti-falling elevator car structure. Background Art

[0002] An elevator is a permanent transport device that serves specific floors within a building. Its car runs on at least two rows of rigid tracks that are perpendicular to the horizontal plane or inclined at an angle of less than 15° from the vertical. If an elevator falls due to various factors and cannot be stopped in time to prevent it from falling, a serious safety accident may occur. Therefore, we propose a fall-resistant elevator car structure. Summary of the Invention

[0003] The present invention aims to provide an anti-fall elevator car structure to solve the problems raised in the above-mentioned background art. To achieve the above-mentioned object, the present invention provides the following technical solution: an anti-fall elevator car structure, comprising a track and a roller provided on a car body, the roller rolling on the track, a bracket 1 fixed to the car body, and a guide wheel provided on the bracket 1, and further comprising:

[0004] The trigger mechanism is arranged on the upper part of the car body. One end of the steel rope is fixedly connected to the car body, passes through the guide wheel and connects to the trigger mechanism;

[0005] The support mechanism and the trigger mechanism are arranged at the bottom of the car body, and the trigger mechanism is connected to the support mechanism in a transmission manner. A plurality of horizontally arranged support plates are fixed on the track at equal intervals from top to bottom;

[0006] The stopping mechanism is arranged in the middle of the car body. The supporting mechanism is connected to the stopping mechanism through a pipeline. The stopping mechanism is used to stop the roller.

[0007] Preferably, the supporting mechanism includes two suspension rods fixed to the bottom of the car body and symmetrically arranged, and the lower ends of the two suspension rods are respectively fixedly connected to the two ends of the cross brace, and a sliding rod 1 passes through the middle of the cross brace and is slidably connected, and a disc is fixed to the upper end of the sliding rod 1, and the lower end of the sliding rod 1 is connected to the bottom surface of the cross brace through a spring 1.

[0008] Preferably, the lower ends of the two suspension rods are hinged with anti-fall plates, and the two anti-fall plates are arranged in an eight-shape. The lower end of the slide rod 1 is hinged to the bottom surfaces of the two anti-fall plates through two connecting rods 1 respectively. The bottom surface of the car body is symmetrically hinged with two pump barrels 2, and the interior of the pump barrel 2 is slidingly connected to a piston plate 2. The piston plate 2 is connected to one end of the pump barrel 2 through a spring 5. A push rod 2 is fixed to one side of the piston plate 2, and the two push rods 2 are hinged to the upper surfaces of the two anti-fall plates respectively.

[0009] Preferably, the stopping mechanism includes a pump barrel 1 fixed on the outer wall of the car body, the interior of the pump barrel 1 is slidably connected to a piston plate 1, the piston plate 1 is connected to one end of the pump barrel 1 through a spring 3, a push rod 1 is fixed on the piston plate 1, a stop block is fixed on the upper end of the push rod 1, and the pump barrel 1 is connected to the pump barrel 2 through a conduit.

[0010] Preferably, slide cylinder 1 and slide cylinder 2 are fixed on and connected to the peripheral wall of pump cylinder 1, a slide plate is slidably connected inside slide cylinder 1, the slide plate is connected to one end of slide cylinder 1 through spring 4, the slide plate is fixedly connected to one end of a U-shaped rod, and the other end of the U-shaped rod is inserted into and slidably connected to slide cylinder 2, and the end of the U-shaped rod located in slide cylinder 2 is wedge-shaped, and the wedge surface is set facing the stop block.

[0011] Preferably, the trigger mechanism includes a shaft connected to the outer peripheral wall of the car body with a fixed axis rotation, and the upper and lower ends of the shaft are coaxially fixedly connected to gear one and gear two respectively, gear two is meshed with rack two, and rack two passes through and is slidably connected to one of the suspension rods, and rack two is in contact with the upper surface of the disc.

[0012] Preferably, a bracket three is fixed on the upper surface of the car body, a slide rail is fixed on the bracket three, and blocks are fixed at the upper and lower ends of the slide rail. A raised structure is integrated in the middle of the slide rail, and a through channel is opened between the bracket three and the middle of the slide rail.

[0013] Preferably, two sliders are slidably connected to the slide rail, and each of the sliders is hinged with a connecting rod 2, and the two connecting rods 2 are hinged at one end away from the slider. The ends of the two connecting rods 2 connected to the corresponding sliders are connected by a tension spring, and when the two connecting rods 2 are in a straight line, the slider contacts the corresponding stop block, and the ends of the two connecting rods 2 connected are buckled and contact the protruding structure.

[0014] Preferably, a bracket four is fixed on the upper surface of the car body, and a rack one is slidably connected to the bracket four, the rack one is meshed with the gear one, and the ends of the two connecting rods two are hinged to the rack one.

[0015] Preferably, a bracket 2 is fixed on the upper surface of the car body, a slide rod 2 is slidably connected to the bracket 2, one end of the slide rod 2 is inserted and slidably connected in the channel, and the other end is hinged to a tensioning wheel, a steel rope is wound around the tensioning wheel, and the slide rod 2 is connected to the bracket 2 through a spring 2.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the present invention, during the operation of the car body, when the steel rope breaks, the trigger mechanism releases the restriction on the supporting mechanism, so that the two stop plates in the supporting mechanism open and support on the support plate, thereby stopping the car body from falling, and the supporting mechanism drives the stop mechanism to restrict the roller so that it cannot roll on the track. The double safety protection measures prevent the car body from falling, greatly improving the safety of elevator operation, and no electrical devices are required, the implementation of the above safety measures will not be affected by power outages, and it can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the general assembly structure of the present invention in a normal state;

[0019] Figure 2 for Figure 1 A in the figure shows the enlarged structural diagram;

[0020] Figure 3 It is a schematic diagram of the second cross-section structure of the pump barrel in the present invention;

[0021] Figure 4 This is a schematic diagram of a cross-sectional structure of a pump barrel in the present invention;

[0022] Figure 5 This is a schematic diagram of the anti-falling state assembly structure of the present invention.

[0023] In the figure: 1. Car body; 2. Roller; 3. Stop block; 4. Pump barrel 1; 5. Track; 6. Support plate; 7. Shaft; 8. Bracket 1; 9. Tensioner; 10. Steel rope; 11. Gear 1; 12. Gear 2; 13. Pump barrel 2; 14. Hanging rod; 15. Cross brace; 16. Slide bar 1; 17. Disc; 18. Spring 1; 19. Stop plate; 20. Connecting rod 1; 21. Rack 2; 22. Slide bar 2; 23. Spring 2 24. Bracket 2; 25. Bracket 3; 26. Slide rail; 27. Slider; 28. Stopper; 29. Channel; 30. Connecting rod 2; 31. Tension spring; 32. Rack 1; 33. Bracket 4; 34. Piston plate 1; 35. Spring 3; 36. Push rod 1; 37. Slide plate; 38. Slide cylinder 1; 39. U-shaped rod; 40. Slide cylinder 2; 41. Conduit; 42. Spring 4; 43. Spring 5; 44. Push rod 2; 45. Piston plate 2. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] See also Figures 1 to 5 The present invention provides a technical solution: an anti-fall elevator car structure, comprising a track 5 and a roller 2 provided on a car body 1, the roller 2 rolling on the track 5, a bracket 8 fixed to the car body 1, and a guide wheel provided on the bracket 8, and further comprising:

[0026] The trigger mechanism is arranged on the upper part of the car body 1. After one end of the steel rope 10 is fixedly connected to the car body 1, it passes through the guide wheel and the trigger mechanism;

[0027] The support mechanism and the trigger mechanism are arranged at the bottom of the car body 1, and the trigger mechanism is connected to the support mechanism in a transmission manner. A plurality of horizontally arranged support plates 6 are fixed on the track 5 at equal intervals from top to bottom;

[0028] The stopping mechanism is arranged in the middle of the car body 1 , the supporting mechanism is connected to the stopping mechanism through a pipeline, and the stopping mechanism is used to stop the roller 2 .

[0029] In this embodiment, the support mechanism includes two suspenders 14 fixed to the bottom of the car body 1 and symmetrically arranged, and the lower ends of the two suspenders 14 are respectively fixedly connected to the two ends of the cross brace 15, and the middle part of the cross brace 15 is penetrated and slidably connected with a slide rod 16, and the upper end of the slide rod 16 is fixed with a disc 17, and the lower end of the slide rod 16 is connected to the bottom surface of the cross brace 15 through a spring 18. The lower ends of the two suspenders 14 are hinged with a stop plate 19, and the two stop plates 19 are hinged. 9 is arranged in an eight-shaped shape, and the lower end of the slide rod 16 is hinged to the bottom surface of the two anti-fall plates 19 through two connecting rods 20 respectively. The bottom surface of the car body 1 is symmetrically hinged with two pump barrels 13, and the interior of the pump barrel 13 is slidably connected to a piston plate 45. The piston plate 45 is connected to one end of the pump barrel 13 through a spring 43. A push rod 44 is fixed to one side of the piston plate 45. The two push rods 44 are hinged to the upper surface of the two anti-fall plates 19 respectively.

[0030] In this embodiment, the stop mechanism includes a pump barrel 4 fixed on the outer wall of the car body 1, and the interior of the pump barrel 4 is slidably connected to a piston plate 34, which is connected to one end of the pump barrel 4 through a spring three 35, and a push rod 36 is fixed on the piston plate 34, and a stop block 3 is fixed on the upper end of the push rod 36, and the pump barrel 4 is connected to the pump barrel 2 13 through a conduit 41, and a slide barrel 1 38 and a slide barrel 2 40 are fixed and connected on the peripheral wall of the pump barrel 4, and a slide plate 37 is slidably connected in the slide barrel 38, and the slide plate 37 is connected to one end of the slide barrel 1 38 through a spring four 42, and the slide plate 37 is fixedly connected to one end of a U-shaped rod 39, and the other end of the U-shaped rod 39 is inserted into and slidably connected to the slide barrel 2 40, and the end of the U-shaped rod 39 located in the slide barrel 2 40 is wedge-shaped, and the wedge surface is set to face the stop block 3.

[0031] In this embodiment, the trigger mechanism includes a shaft 7 that is rotatably connected to the outer wall of the car body 1. The upper and lower ends of the shaft 7 are coaxially fixedly connected to gear 11 and gear 2 12 respectively. Gear 2 12 is meshed with rack 21, and rack 21 passes through and is slidably connected to one of the suspension rods 14. Rack 21 is in contact with the upper surface of the disc 17. A bracket 3 25 is fixed to the upper surface of the car body 1. A slide rail 26 is fixed on the bracket 3 25, and blocks 28 are fixed at the upper and lower ends of the slide rail 26. A protruding structure is integrated in the middle of the slide rail 26, and a through channel 29 is provided in the middle of the bracket 3 25 and the slide rail 26. Two sliders 27 are slidably connected to the slide rail 26, and both sliders 27 are hinged with connecting rod 2 30. One of the two connecting rods 30 is away from the slider 27. The ends are hinged, and the ends of the two connecting rods 230 connected to the corresponding sliders 27 are connected by tension springs 31, and when the two connecting rods 230 are in a straight line, the slider 27 contacts the corresponding block, and the ends connected to the two connecting rods 230 buckle and contact the raised structure. A bracket four 33 is fixed on the upper surface of the car body 1, and a rack 1 32 is slidably connected to the bracket four 33. The rack 1 32 is meshed with the gear 11, and the ends connected to the two connecting rods 230 are hinged to the rack 1 32. A bracket two 24 is fixed on the upper surface of the car body 1, and a slide rod two 22 is slidably connected to the bracket two 24. One end of the slide rod two 22 is inserted and slidably connected in the channel 29, and the other end is hinged to the tensioning wheel 9. The steel rope is wound around the tensioning wheel 9, and the slide rod two 22 is connected to the bracket two 24 through a spring two 23.

[0032] Working principle and advantages of the present invention: When the anti-falling elevator car structure is in use, the working process is as follows:

[0033] like Figures 1 to 5 As shown, in the normal state, the two connecting rods 30 are in the same straight line state, that is, the dead point state. In the normal process of lifting the car body 1, the steel rope 10 is in a taut state, thereby exerting a force on the tension wheel 9. Figure 1 、 Figure 2 The pulling force to the left overcomes the elastic force of spring 23, so that the slide bar 22 does not interfere with the connecting end of the two connecting rods 2 30, and the rack 21 interferes with the upper surface of the disc 17, thereby limiting the upward movement of the disc 17, so that the slide bar 16 applies a pulling force to the two anti-fall plates 19 through the two connecting rods 1 20, so that the two anti-fall plates 19 are close together and will not affect the operation of the car body 1; at the same time, the U-shaped rod 39 limits the piston plate 1 34, so that the top rod 1 36 will not drive the stop block 3 close to the roller under the action of spring 3 35, thereby not affecting the operation of the car body 1.

[0034] When the steel rope 10 breaks suddenly, the car body 1 loses its upward lifting force, resulting in a falling event. At this time, the tension wheel 9 is not subjected to the tension of the steel rope 10, and thus drives the slide bar 22 to move to the right under the action of the spring 23, and then the slide bar 22 applies a rightward thrust to the end portion connected to the two connecting rods 2 30, thereby destroying the dead point state of the two connecting rods 2 30, and under the action of the tension spring 31, the two connecting rods 2 30 jointly push the rack 1 32 to move to the right, so that the rack 1 32 drives the gear 11 and the shaft 7 to rotate , and then the shaft 7 drives the rack 2 21 to move right through the gear 2 12, and the rack 2 21 is separated from the disc 17, so that the slide bar 16 moves up under the action of the spring 18, and the slide bar 16 drives the two anti-fall plates 19 to open through the two connecting rods 1 20, so that in the process of the car body 1 moving downward, the anti-fall plates 19 are supported on the supporting plate 6, thereby stopping the car body 1 from falling, improving the safety of the elevator operation, and no electrical devices are required to participate, and the implementation of the above safety measures will not be affected by power failure.

[0035] As described above, when the two anti-fall plates 19 are opened, the piston plate 2 45 is driven by the push rod 2 44 to compress the spring 5 43, and the piston plate 2 45 transports the oil in the pump barrel 2 13 to the pump barrel 1 4 through the conduit 41, thereby increasing the hydraulic pressure in the pump barrel 1 4, and the slide plate 37 compresses the spring 42 under the action of the hydraulic pressure and drives the U-shaped rod 39 to move, so that the wedge-shaped end of the U-shaped rod 39 contacts the restriction on the piston plate 1 34, so that the piston plate 1 34 pushes the push rod 1 36 and the stop block 3 at its upper end upward under the action of the hydraulic pressure and spring 3 35, and the stop block 3 is stuck on the lower side of the contact point between the roller 2 and the track, thereby limiting the continued rolling of the roller 2, thereby achieving the purpose of stopping and preventing the car body 2 from falling off. The double safety protection measures prevent the car body 1 from falling off, thereby greatly improving the safety of the operation of the car body 1.

[0036] When the dangerous situation is relieved and the steel rope 10 is repaired, the steel rope 10 applies tension to the tension wheel 9, so that the slide bar 22 overcomes the elastic force of the spring 23 to reset, and the two anti-fall plates 19 are retracted by external force, so that the anti-fall plates 19 drive the slide bar 16 to move down through the two connecting rods 1 20, and stretch the spring 18. After the slide bar 16 moves down, it drives the disc 17 to move down and reset, and then pushes the rack 1 32 to the left, so that the rack 1 32 applies thrust to the two connecting rods 2 30, so that the two connecting rods 2 30 are in a straight line state, completing the reset, and at the same time, the rack 1 32 drives the shaft 7 to reverse through the gear 1 11, so that the shaft 7 drives the gear 2 12 to reverse, and then the gear 2 12 drives the rack 2 21 to move left and engage with the disc 17. The upper surface of the U-shaped rod 39 is buckled and contacted to limit the disc 17. During the resetting process of the two stop plates 19, the piston plate 2 45 is driven to reset through the push rod 2 44, so that the piston plate 2 45 draws the oil in the pump barrel 1 4 into the pump barrel 2 13 through the conduit 41, so that the hydraulic pressure in the pump barrel 1 4 is reduced, and the push rod 1 36 is pressed down to make the stop block 3 disengage from the roller 2, and the piston plate 1 34 stretches the spring 3 35. During the resetting process of the piston plate 1 34, when it is buckled and contacted with the wedge-shaped surface of the U-shaped rod 39, the U-shaped rod 39 moves outward and drives the slide plate 37 to compress the spring 42. When the piston plate 1 34 passes the wedge-shaped surface and resets, the U-shaped rod 39 moves in the opposite direction under the action of the spring 42, and its wedge-shaped end limits the piston plate 1 34, so that it can be reused.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0038] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. An anti-fall elevator car structure, comprising a track (5) and a roller (2) arranged on a car body (1), wherein the roller (2) rolls on the track (5), a bracket (8) is fixed to the car body (1), and a guide wheel is arranged on the bracket (8), characterized in that: Also includes: A trigger mechanism is provided on the upper portion of the car body (1); one end of the steel rope (10) is fixedly connected to the car body (1), passes through the guide wheel and is connected to the trigger mechanism; A support mechanism and a trigger mechanism are arranged at the bottom of the car body (1), and the trigger mechanism is in transmission connection with the support mechanism. A plurality of horizontally placed support plates (6) are fixed on the track (5) at equal intervals from top to bottom; A stopping mechanism is provided in the middle of the car body (1); the supporting mechanism and the stopping mechanism are connected via a pipeline; the stopping mechanism is used to stop the roller (2).

2. The anti-falling elevator car structure according to claim 1, characterized in that: The support mechanism includes two suspension rods (14) fixed to the bottom of the car body (1) and symmetrically arranged, and the lower ends of the two suspension rods (14) are respectively fixedly connected to the two ends of the cross brace (15), and a slide rod (16) passes through the middle of the cross brace (15) and is slidably connected thereto, and a disc (17) is fixed to the upper end of the slide rod (16), and the lower end of the slide rod (16) is connected to the bottom surface of the cross brace (15) through a spring (18).

3. The anti-falling elevator car structure according to claim 2, characterized in that: The lower ends of the two suspension rods (14) are hinged with a stop plate (19), and the two stop plates (19) are arranged in an eight-shaped shape. The lower end of the slide rod (16) is hinged to the bottom surfaces of the two stop plates (19) through two connecting rods (20). The bottom surface of the car body (1) is symmetrically hinged with two pump barrels (13). The inside of the pump barrel (13) is slidably connected to a piston plate (45). The piston plate (45) is connected to one end of the pump barrel (13) through a spring (43). A push rod (44) is fixed to one side of the piston plate (45). The two push rods (44) are hinged to the upper surfaces of the two stop plates (19).

4. The anti-falling elevator car structure according to claim 3, characterized in that: The stopping mechanism comprises a pump barrel (4) fixed on the outer wall of the car body (1), a piston plate (34) is slidably connected inside the pump barrel (4), the piston plate (34) is connected to one end of the pump barrel (4) through a spring (35), a push rod (36) is fixed on the piston plate (34), a stop block (3) is fixed on the upper end of the push rod (36), and the pump barrel (4) is connected to the pump barrel (13) through a conduit (41).

5. The anti-falling elevator car structure according to claim 4, characterized in that: A slide cylinder 1 (38) and a slide cylinder 2 (40) are fixed and connected to the peripheral wall of the pump cylinder 1 (4), a slide plate (37) is slidably connected in the slide cylinder 1 (38), the slide plate (37) is connected to one end of the slide cylinder 1 (38) through a spring 4 (42), the slide plate (37) is fixedly connected to one end of a U-shaped rod (39), the other end of the U-shaped rod (39) is plugged into and slidably connected to the slide cylinder 2 (40), and one end of the U-shaped rod (39) located in the slide cylinder 2 (40) is wedge-shaped, and the wedge surface is arranged toward the stop block (3).

6. The anti-falling elevator car structure according to claim 2, characterized in that: The trigger mechanism comprises a shaft (7) which is fixedly connected to the outer peripheral wall of the car body (1) in a fixed axis rotation manner, the upper and lower ends of the shaft (7) are respectively coaxially fixedly connected to gear 1 (11) and gear 2 (12), gear 2 (12) is meshedly connected with rack 2 (21), and rack 2 (21) passes through and is slidably connected to one of the suspension rods (14), and rack 2 (21) is in contact with the upper surface of the disc (17).

7. The anti-falling elevator car structure according to claim 6, characterized in that: A bracket three (25) is fixed on the upper surface of the car body (1), a slide rail (26) is fixed on the bracket three (25), and blocks (28) are fixed at both upper and lower ends of the slide rail (26). A protruding structure is integrated in the middle of the slide rail (26), and a through channel (29) is opened in the middle of the bracket three (25) and the slide rail (26).

8. The anti-falling elevator car structure according to claim 7, characterized in that: Two sliders (27) are slidably connected to the slide rail (26), and the two sliders (27) are hinged with connecting rods (30). The two connecting rods (30) are hinged at one end away from the slider (27). The ends of the two connecting rods (30) connected to the corresponding sliders (27) are connected by tension springs (31), and when the two connecting rods (30) are in a straight line, the slider (27) contacts the corresponding stopper, and the ends connected to the two connecting rods (30) contact the protruding structure.

9. The anti-falling elevator car structure according to claim 8, characterized in that: A bracket four (33) is fixed on the upper surface of the car body (1), and a rack one (32) is slidably connected to the bracket four (33), the rack one (32) is meshed with the gear one (11), and the ends of the two connecting rods two (30) are hinged to the rack one (32).

10. The anti-falling elevator car structure according to claim 8, characterized in that: A second bracket (24) is fixed on the upper surface of the car body (1), and a second slide bar (22) is slidably connected to the second bracket (24). One end of the second slide bar (22) is inserted and slidably connected in the channel (29), and the other end is hinged to a tensioning wheel (9). A steel rope is wound around the tensioning wheel (9). The second slide bar (22) is connected to the second bracket (24) through a second spring (23).

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