Descending device

Abstract

The utility model discloses a descender, and belongs to the field of outdoor articles. A descender comprises a fixed side plate, a movable side plate, a rotating shaft sleeve, a handle and a cam. The movable side plate is rotationally connected with the fixed side plate through the rotating shaft sleeve; the cam is rotationally arranged on one side of the fixed side plate, and a corresponding first wire groove is formed in the periphery of the cam so that a rope can pass through the first wire groove. The handle is rotationally arranged on the side, away from the cam, of the fixed side plate. A wedge block is rotationally embedded between the handle and the fixed side plate, and the side wall of the wedge block is sleeved with a first spring to provide buffering for the wedge block; a protruding block is installed at the end of the side, facing the fixed side plate, of the cam, the handle and the cam are linked through a wedge block and the protruding block and can rotate, and the abutting position of a first wire groove formed in the cam and the rope moves inwards and outwards along with rotation of the cam so that the descending speed of the rope can be controlled, and the mechanism can be prevented from being out of control. In this way, the descending speed of the rope is controlled through the handle, and operation is easy and convenient.

Description

Technical Field

[0001] The utility model belongs to the field of outdoor supplies, and more specifically, relates to a descender. Background Art

[0002] A descending device is a device used to adjust and control the length of a rope, and it plays an important role in various application scenarios, such as outdoor sports, etc.; with the progress of technology and the popularization of outdoor sports, higher requirements are put forward for the performance, safety and convenience of the descending device;

[0003] In the prior art, in the invention patent with the Chinese patent application number "CN201611052614.X" and the publication date of November 16, 2021, a panic-proof descending protector is disclosed, which includes a fixed plate, a movable side plate, a rope wheel, a rope winding seat and a control handle; among them, the rope wheel has a semi-circular wheel surface, a straight-edge stopping surface and an incoming rope guiding surface, the straight-edge stopping surface has a first stopping part and a second stopping part, the first stopping part forms a stop in the initial state, and the second stopping part forms a stop protection when the control handle swings to the whole process; a driving crank is arranged between the control handle and the rope wheel, one end of the driving crank has a convex pin inserted into the slot of the control handle, and the convex pin at the other end passes through the hollow slot of the fixed plate and then is inserted into the driving slot of the rope wheel. When the control handle swings half of its stroke, the distance between the straight-edge stopping surface of the rope wheel and the rope winding seat is the largest. When swinging the whole process, the second stopping part of the straight-edge stopping surface of the rope wheel approaches the rope winding seat, compresses the rope, and realizes the second stop, realizing the overswing stop state when panicking; however, in this way, the sliding of the driving crank in the hollow slot and the driving slot is straight back and forth, and no buffer structure is provided. In this way, when the operator operates, he cannot well control the rotation of the control handle, resulting in the inability to well control the rope. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a descender, which can realize simple operation of controlling the descending speed of the rope.

[0005] A descender of the utility model includes a fixed side plate, a movable side plate, a rotating shaft sleeve, a handle and a cam; the movable side plate is rotatably connected with the fixed side plate through the rotating shaft sleeve; the cam is rotatably arranged on one side of the fixed side plate, and a corresponding first wire groove is arranged on the outer circumference of the cam for the rope to pass through; the handle is rotatably arranged on the side of the fixed side plate away from the cam;

[0006] A wedge is rotatably embedded between the handle and the fixed side plate, and a first spring is sleeved on the side wall of the wedge to provide a buffer for the wedge; a protrusion is installed on the end of the cam facing the fixed side plate, and the handle and the cam are rotatable through the linkage of the wedge and the protrusion. The first wire groove arranged on the cam and the abutment of the rope move inward and outward directions with the rotation of the cam to control the descent speed of the rope and prevent the mechanism from getting out of control.

[0007] As a further improvement of the utility model, the wedge block includes a wedge column, a connecting column, a fixed block and a rolling ball; the connecting column and the fixed block are respectively fixed at the two ends of the top of the wedge column; the rolling ball is embedded in the side wall of the fixed block; one end of the first spring is sleeved on the outer circumference of the rolling ball and abuts against the side wall of the fixed block.

[0008] As a further improvement of the utility model, a sliding groove and a rotating groove are respectively provided on the side of the handle facing the fixed side plate; the rotating groove is arranged in the sliding groove and is connected through it; the wedge block is rotatably arranged in the sliding groove, and the connecting column on the top of the wedge block is rotatably arranged in the rotating groove; the end of the first spring away from the rolling ball is arranged to abut against the inner wall of the sliding groove; the first spring cooperates with the wedge block to limit the rotation range of the handle.

[0009] As a further improvement of the utility model, the slide groove includes a first slide groove and a second slide groove, the depth of the first slide groove is less than that of the second slide groove, the first slide groove forms a step relative to the second slide groove, the rotating groove is opened on the step, the fixed block at the top of the wedge block is slidably arranged in the second slide groove, and the first spring is arranged in the second slide groove;

[0010] The first slide groove and the second slide groove are connected through and arranged in a "V" shape.

[0011] As a further improvement of the utility model, it also includes a fixed friction block, the fixed friction block and the cam are both arranged between the fixed side plate and the movable side plate; the fixed friction block is fixedly arranged on the side wall of the fixed side plate at one end away from the rotating shaft sleeve; the cam is rotatably arranged on the side wall of the fixed side plate between the fixed friction block and the rotating shaft sleeve facing the movable side plate; a corresponding second wire groove is opened on the outer periphery of the fixed friction block for the rope to pass through.

[0012] As a further improvement of the utility model, it also includes a second fixed shaft, which passes through the fixed friction block and the fixed side plate in sequence, and the fixed friction block is installed and connected with the fixed side plate through the second fixed shaft; both ends of the second fixed shaft are fixedly provided with second limit plates to limit the fixed side plate and the fixed friction block on the second fixed shaft;

[0013] A first boss is disposed at one end of the second fixed shaft away from the fixed side plate; a first slot is disposed at one end of the movable side plate away from the rotating shaft sleeve, the opening of the first slot is disposed toward the first boss, and the maximum size of the inner wall of the first slot matches the first boss, so that the first slot is engaged with the first boss;

[0014] The outer diameter of the first boss is greater than the outer diameter of the second fixed shaft.

[0015] As a further improvement of the present utility model, it further includes a first fixed shaft. A third spring is sleeved on the outer periphery of the first fixed shaft. The third spring abuts between the fixed side plate and the cam. The cam is installed and connected to the fixed side plate through the first fixed shaft. Second limit pieces are arranged at both ends of the first fixed shaft. One of the second limit pieces abuts against the outer side wall of the fixed side plate. A second boss is fixedly arranged between the other second limit piece and the first fixed shaft. A second card slot is formed on the moving side plate. The opening of the second card slot faces the second boss. The maximum dimension of the inner wall of the second card slot matches the second boss to enable the second card slot to be clamped with the second boss; the convex block is arranged at the end of the cam, and the convex block is slidably arranged on the outer periphery of the fixed side plate;

[0016] The outer diameter of the second boss is greater than the outer diameter of the first fixed shaft.

[0017] As a further improvement of the present utility model, it further includes a switch. The switch penetrates the moving side plate and is installed and connected to the moving side plate. The switch is linked with the first fixed shaft to control the opening and closing of the moving side plate;

[0018] A switch slot is formed on the side of the moving side plate facing the fixed side plate. At the same time, a switch hole is formed through the moving side plate; the switch includes a knob, a second spring and a linkage rod; the linkage rod is slidably arranged in the switch slot. The knob is arranged on the outer side wall of the moving side plate. The knob penetrates the switch hole and is installed and connected to the linkage rod; a series connection column is fixedly arranged on the side wall at one end of the linkage rod. One end of the second spring is sleeved on the outer periphery of the series connection column. The other end of the second spring abuts against the inner side wall of the switch slot; a limit block is arranged above the switch slot to limit the linkage rod and the second spring in the switch slot; a convex part is protruded at the top of the other end of the linkage rod, and the convex part cooperates with the limit block to control the moving range of the linkage rod.

[0019] As a further improvement of the present utility model, it further includes a handle rotating shaft and a torsion spring. The handle is rotatably connected to the fixed side plate through the handle rotating shaft; a connection groove is formed through the handle from the outside to the inside; the connection groove is formed at the end of one end of the handle; one end of the handle rotating shaft penetrates the connection groove and is rotatably connected to the handle; the other end of the handle rotating shaft penetrates the fixed side plate and is rotatably connected to the fixed side plate; the torsion spring is sleeved on the outer periphery of the handle rotating shaft and is arranged between the handle and the fixed side plate.

[0020] As a further improvement of the present utility model, the convex block and the cam are integrally formed;

[0021] Or, a detachable connection; the detachable connection is riveting.

[0022] Compared with the prior art, the utility model has the following beneficial effects: in the scheme of the utility model, the handle is mounted on the fixed side plate and can rotate freely. A wedge block and a first spring are embedded in the handle. The handle can rotate within a certain range, and the first spring provides a buffer for the wedge block. The handle is operated to make the wedge block and the convex block structure on the cam work in conjunction, thereby controlling the descending speed. When the handle is operated to a certain angle, the wedge block in the handle is separated from the convex block structure on the cam, thereby realizing the anti-panic function. After the handle rebounds, the wedge block rotates in the groove and can pass over the convex block on the cam. The handle can be operated again to make the rope continue to descend. With such a configuration, the overall operation is simple and easy to use, and the descent speed of the rope can be controlled.

[0023] The utility model is also provided with a switch, which is linked with the first fixed shaft to control the opening and closing of the movable side plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the descender of the utility model;

[0025] Figure 2 This is a schematic diagram of the simulated structure of the descender of the utility model;

[0026] Figure 3 This is one of the schematic diagrams of the explosion structure of the descender of the utility model;

[0027] Figure 4 This is one of the schematic diagrams of the handle structure of the utility model;

[0028] Figure 5 It is a structural schematic diagram of the combination of the handle and the wedge block of the utility model;

[0029] Figure 6 This is a schematic diagram of the wedge structure of the utility model;

[0030] Figure 7 This is the second schematic diagram of the explosion structure of the descender of the utility model;

[0031] Figure 8 This is the second structural schematic diagram of the movable side panel combined with the switch of the utility model;

[0032] Figure 9 This is a schematic diagram of the switch structure of the utility model;

[0033] Figure 10 The utility model is a schematic diagram of the explosion structure of the switch.

[0034] Description of the numbers in the figure:

[0035] 1. Moving side panel; 11. First card slot; 12. Second card slot; 13. Switch slot; 2. Fixed side panel; 21. Movable slot; 3. Handle; 31. Handle shaft; 32. Torsion spring; 33. Wedge block; 331. Column; 332. Fixed block; 333. Roller ball; 334. Connecting column; 34. First spring; 35. Limiting ring; 37. Rotating slot; 38. Connecting slot; 4. Rotating shaft; 5. First fixed shaft; 6. Switch; 61. Knob; 62. Second spring; 63. Slider; 64. Limiting block; 7. Cam; 71. Bump; 73. First wire slot; 8. Fixed friction block; 81. Second wire slot; 9. Second fixed shaft; 10. Friction lip. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the embodiments. The following embodiments are intended to explain the present invention but the present invention is not limited to the following embodiments.

[0037] Specific embodiment 1: Please refer to Figure 1-6 A descender comprises a fixed side plate 2, a movable side plate 1 and a rotating shaft sleeve 4; the movable side plate 1 is rotatably connected to the fixed side plate 2 through the rotating shaft sleeve 4; one end of the rotating shaft sleeve 4 passes through one end of the fixed side plate 2 and is installed and connected to the fixed side plate 2; the other end of the rotating shaft sleeve 4 passes through the movable side plate 1 and is rotatably connected to the movable side plate 1.

[0038] The descender also includes a handle 3 and a cam 7. The cam 7 is rotatably arranged on one side of the fixed side plate 2. A corresponding first wire groove 73 is opened on the outer periphery of the cam 7 for the rope to pass through. The handle 3 is rotatably arranged on the side of the fixed side plate 2 away from the cam 7.

[0039] The descender also includes a handle shaft 31 and a torsion spring 32, and the handle 3 is rotatably connected to the fixed side plate 2 via the handle shaft 31; a connecting groove 38 is provided through the handle 3 from the outside to the inside; the connecting groove 38 is provided at the end of one end of the handle 3; one end of the handle shaft 31 passes through the connecting groove 38 and is rotatably connected to the handle 3; the other end of the handle shaft 31 passes through the fixed side plate 2 and is rotatably connected to the fixed side plate 2; the torsion spring 32 is sleeved on the outer periphery of the handle shaft 31 and is arranged between the handle 3 and the fixed side plate 2.

[0040] A wedge block 33 is rotatably embedded between the handle 3 and the fixed side plate 2 , and a first spring 34 is sleeved on the side wall of the wedge block 33 to provide a buffer for the wedge block 33 .

[0041] The wedge block 33 includes a column 331, a connecting column 334, a fixed block 332 and a ball 333; the connecting column 334 and the fixed block 332 are respectively fixed at the two ends of the top of the column 331; the ball 333 is embedded in the side wall of the fixed block 332; one end of the first spring 34 is sleeved on the outer periphery of the ball 333 and abuts against the side wall of the fixed block 332.

[0042] Preferably, the mid-stream pillar 331 is arc-shaped; the connecting pillar 334 is cylindrical.

[0043] On the side of the handle 3 facing the fixed side plate 2, a sliding groove 35 and a rotating groove 37 are respectively formed; the rotating groove 37 is arranged in the sliding groove 35 and runs through and communicates; the wedge 33 is rotatably arranged in the sliding groove 35, and the connecting pillar 334 at the top of the wedge 33 is rotatably arranged in the rotating groove 37; one end of the first spring 34 away from the ball 333 is abutted against the inner side wall of the sliding groove 35; the first spring 34 cooperates with the wedge 33 to limit the rotation range of the handle.

[0044] Preferably, the sliding groove 35 includes a first sliding groove and a second sliding groove. The depth of the first sliding groove is less than that of the second sliding groove. A step is formed between the first sliding groove and the second sliding groove. The rotating groove 37 is opened on the step. The fixed block 332 at the top of the wedge 33 is slidably arranged in the second sliding groove, and the first spring 34 is arranged in the second sliding groove.

[0045] Preferably, the first sliding groove and the second sliding groove run through and communicate with each other and are arranged in a "V" shape.

[0046] Preferably, the inner diameter of the rotating groove 37 matches the maximum outer diameter of the connecting pillar 334 to receive the connecting pillar 334.

[0047] At the end of the side of the cam 7 facing the fixed side plate 2, a convex block 71 is installed. The handle 3 and the cam 7 are linked and rotatable through the wedge 33 and the convex block 71. The contact position between the first wire groove 73 provided on the cam 7 and the rope moves in the inner and outer directions as the cam 7 rotates to control the descending speed of the rope and prevent the mechanism from getting out of control.

[0048] The descending device further includes a fixed friction block 8. Both the fixed friction block 8 and the cam 7 are arranged between the fixed side plate 2 and the moving side plate 1; the fixed friction block 8 is fixedly arranged on the side wall of the end of the fixed side plate 2 away from the rotating shaft sleeve 4; the cam 7 is rotatably arranged on the side wall of the fixed side plate 2 facing the moving side plate 1 between the fixed friction block 8 and the rotating shaft sleeve 4; a corresponding second wire groove 81 is opened on the outer periphery of the fixed friction block 8 for the rope to pass through.

[0049] The descending device further includes a second fixed shaft 9. The second fixed shaft 9 sequentially passes through the fixed friction block 8 and the fixed side plate 2. The fixed friction block 8 is installed and connected to the fixed side plate 2 through the second fixed shaft 9; second limiting pieces are fixedly arranged at both ends of the second fixed shaft 9 to limit the fixed side plate 2 and the fixed friction block 8 on the second fixed shaft 9.

[0050] One end of the second fixed shaft 9 away from the fixed side plate 2 is provided with a first boss; one end of the moving side plate 1 away from the rotating shaft sleeve 4 is provided with a first card slot 11, the opening of the first card slot 11 faces the first boss, and the maximum dimension of the inner wall of the first card slot 11 matches the first boss, so that the first card slot 11 is clamped with the first boss.

[0051] The outer diameter of the first boss is larger than the outer diameter of the second fixed shaft 9.

[0052] The descending device further includes a first fixed shaft 5. A third spring is sleeved on the outer periphery of the first fixed shaft 5. The third spring abuts between the fixed side plate 2 and the cam 7. The cam 7 is installed and connected to the fixed side plate 2 through the first fixed shaft 5. Both ends of the first fixed shaft 5 are provided with second limiting pieces. One of the second limiting pieces abuts against the outer side wall of the fixed side plate 2, and a second boss is fixedly arranged between the other second limiting piece and the first fixed shaft 5. A second card slot 12 is provided on the moving side plate 1. The opening of the second card slot 12 faces the second boss. The maximum dimension of the inner wall of the second card slot 12 matches the second boss, so that the second card slot 12 is clamped with the second boss; a convex block 71 is arranged at the end of the cam 7, and the convex block 71 is slidably arranged on the outer periphery of the fixed side plate 2.

[0053] The outer diameter of the second boss is larger than the outer diameter of the first fixed shaft 5.

[0054] Optionally, the convex block 71 and the cam 7 can be integrally formed or detachably connected. If they are detachably connected, the convex block 71 and the cam 7 are riveted.

[0055] The descending device further includes a switch 6. The switch 6 penetrates the moving side plate 1 and is installed and connected to the moving side plate 1. The switch 6 is linked with the first fixed shaft 5 to control the opening and closing of the moving side plate 1.

[0056] A switch groove is provided on one side of the moving side plate 1 facing the fixed side plate 2, and at the same time, a switch hole is penetrated through the moving side plate 1; the switch 6 includes a knob 61, a second spring 62 and a linkage rod 63; the linkage rod 63 is slidably arranged in the switch groove, the knob 61 is arranged on the outer side wall of the moving side plate 1, and the knob 61 penetrates the switch hole and is installed and connected to the linkage rod 63; a series connection column is fixedly arranged on the side wall of one end of the linkage rod 63. One end of the second spring 62 is sleeved on the outer periphery of the series connection column, and the other end of the second spring 62 abuts against the inner side wall of the switch groove; a limiting block 64 is covered above the switch groove to limit the linkage rod 63 and the second spring 62 in the switch groove; a top convexity is arranged at the other end of the linkage rod 63 to form a convex part; the convex part cooperates with the limiting block 64 to control the moving range of the linkage rod 63.

[0057] The above is only a preferred specific embodiment of the present application; however, the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, making equivalent substitutions or changes according to the technical solution and its improved concept of the present application, shall be covered by the protection scope of the present application.

Claims

1. A descender, characterized in that: The invention comprises a fixed side plate (2), a movable side plate (1), a rotating shaft sleeve (4), a handle (3) and a cam (7); the movable side plate (1) is rotatably connected to the fixed side plate (2) via the rotating shaft sleeve (4); the cam (7) is rotatably arranged on one side of the fixed side plate (2), and a corresponding first wire groove (73) is provided on the outer periphery of the cam (7) for the passage of a rope; the handle (3) is rotatably arranged on a side of the fixed side plate (2) away from the cam (7); A wedge block (33) is rotatably embedded between the handle (3) and the fixed side plate (2), and a first spring (34) is sleeved on the side wall of the wedge block (33) to provide a buffer for the wedge block (33); a convex block (71) is installed on the end of the cam (7) on the side facing the fixed side plate (2), and the handle (3) and the cam (7) are rotatable through the linkage of the wedge block (33) and the convex block (71); the first wire groove (73) provided on the cam (7) and the abutment point of the rope move inward and outward directions as the cam (7) rotates, so as to control the descending speed of the rope and prevent the mechanism from getting out of control.

2. A descender according to claim 1, characterized in that: The wedge block (33) comprises a wedge column (331), a connecting column (334), a fixed block (332) and a rolling ball (333); the connecting column (334) and the fixed block (332) are respectively fixedly arranged at two ends of the top of the wedge column (331); the rolling ball (333) is embedded in the side wall of the fixed block (332); one end of the first spring (34) is sleeved on the outer periphery of the rolling ball (333) and abuts against the side wall of the fixed block (332).

3. A descender according to claim 2, characterized in that: A slide groove (35) and a rotation groove (37) are respectively provided on a side of the handle (3) facing the fixed side plate (2); the rotation groove (37) is arranged in the slide groove (35) and is connected thereto; the wedge block (33) is rotationally arranged in the slide groove (35), and a connecting column (334) at the top of the wedge block (33) is rotationally arranged in the rotation groove (37); an end of the first spring (34) away from the rolling ball (333) is arranged to abut against the inner side wall of the slide groove (35); the first spring (34) cooperates with the wedge block (33) to limit the rotation range of the handle.

4. A descender according to claim 2, characterized in that: The slide groove (35) includes a first slide groove and a second slide groove, the depth of the first slide groove is smaller than that of the second slide groove, the first slide groove forms a step relative to the second slide groove, the rotating groove (37) is opened on the step, the fixed block (332) at the top of the wedge block (33) is slidably arranged in the second slide groove, and the first spring (34) is arranged in the second slide groove; The first slide groove and the second slide groove are connected through and arranged in a "V" shape.

5. A descender according to claim 1, characterized in that: The invention also comprises a fixed friction block (8), wherein the fixed friction block (8) and the cam (7) are both arranged between the fixed side plate (2) and the movable side plate (1); the fixed friction block (8) is fixedly arranged on a side wall of the fixed side plate (2) at an end away from the rotating shaft sleeve (4); the cam (7) is rotatably arranged on a side wall of the fixed side plate (2) between the fixed friction block (8) and the rotating shaft sleeve (4) at a side facing the movable side plate (1); and a corresponding second wire groove (81) is provided on the outer periphery of the fixed friction block (8) for the rope to pass through.

6. A descender according to claim 5, characterized in that: It also includes a second fixed shaft (9), the second fixed shaft (9) sequentially passing through the fixed friction block (8) and the fixed side plate (2), the fixed friction block (8) being mounted and connected to the fixed side plate (2) via the second fixed shaft (9); second limiting plates are fixedly provided at both ends of the second fixed shaft (9) to limit the fixed side plate (2) and the fixed friction block (8) on the second fixed shaft (9); A first boss is provided at one end of the second fixed shaft (9) away from the fixed side plate (2); a first slot (11) is provided at one end of the movable side plate (1) away from the rotating shaft sleeve (4), the opening of the first slot (11) is arranged toward the first boss, and the maximum size of the inner wall of the first slot (11) matches the first boss, so that the first slot (11) is engaged with the first boss; The outer diameter of the first boss is greater than the outer diameter of the second fixed shaft (9).

7. A descender according to claim 1, characterized in that: The movable side plate (1) further comprises a first fixed shaft (5), wherein a third spring is sleeved on the outer circumference of the first fixed shaft (5), wherein the third spring abuts between the fixed side plate (2) and the cam (7), wherein the cam (7) is installed and connected to the fixed side plate (2) via the first fixed shaft (5), wherein second limiting plates are arranged at both ends of the first fixed shaft (5), wherein one second limiting plate abuts against the outer wall of the fixed side plate (2), and a second boss is fixedly arranged between the other second limiting plate and the first fixed shaft (5), wherein a second slot (12) is provided on the movable side plate (1), wherein the opening of the second slot (12) is arranged toward the second boss, and the maximum size of the inner wall of the second slot (12) matches the second boss, so that the second slot (12) is engaged with the second boss; and a convex block (71) is arranged at the end of the cam (7), and the convex block (71) is slidably arranged on the outer circumference of the fixed side plate (2); The outer diameter of the second boss is greater than the outer diameter of the first fixed shaft (5).

8. A descender according to claim 1, characterized in that: It also includes a switch (6), which passes through the movable side plate (1) and is installed and connected to the movable side plate (1). The switch (6) is linked with the first fixed shaft (5) to control the opening and closing of the movable side plate (1); A switch slot is provided on one side of the movable side plate (1) facing the fixed side plate (2), and a switch hole is provided through the movable side plate (1); the switch (6) comprises a knob (61), a second spring (62) and a linkage rod (63); the linkage rod (63) is slidably arranged in the switch slot, the knob (61) is arranged on the outer wall of the movable side plate (1), and the knob (61) passes through the switch hole and is installed and connected with the linkage rod (63); a series connection column is fixedly arranged on the side wall of one end of the linkage rod (63), one end of the second spring (62) is sleeved on the outer periphery of the series connection column, and the other end of the second spring (62) abuts against the inner side wall of the switch slot; a limit block (64) is provided on the upper cover of the switch slot to limit the linkage rod (63) and the second spring (62) in the switch slot; a top protrusion is provided on the other end of the linkage rod (63) to form a protruding portion; The raised portion cooperates with the limit block (64) to control the moving range of the linkage rod (63).

9. A descender according to claim 1, characterized in that: The handle (3) further comprises a handle rotating shaft (31) and a torsion spring (32), wherein the handle (3) is rotatably connected to the fixed side plate (2) via the handle rotating shaft (31); a connecting groove (38) is formed through the handle (3) from the outside to the inside; the connecting groove (38) is formed at one end of the handle (3); one end of the handle rotating shaft (31) passes through the connecting groove (38) and is rotatably connected to the handle (3); the other end of the handle rotating shaft (31) passes through the fixed side plate (2) and is rotatably connected to the fixed side plate (2); the torsion spring (32) is sleeved on the outer periphery of the handle rotating shaft (31) and is arranged between the handle (3) and the fixed side plate (2).

10. A descender according to claim 1, characterized in that: The convex block (71) and the cam (7) are integrally formed; Or, detachable connection; the detachable connection is riveting.

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