Descending device

Abstract

A swing block hinged to the rear side wall of an installation cavity is arranged in the installation cavity of the descender, the swing block is further provided with a blocking piece, and the blocking piece is located at the position of a second adjusting opening and close to one side of an installation cover. The rope is limited to be installed in the second adjusting opening due to the blocking piece, and the fool-proof purpose is effectively achieved; as friction exists between the rope and the one-way pulley during descending, the friction force can be converted into swinging force of the swinging block, so that the swinging block swings towards the direction of the first adjusting opening to clamp the rope to achieve the purpose of hovering; when unlocking is needed, the adjusting handle is wrenched to manually control the swing block to swing towards the direction of the second adjusting opening to loosen the rope in the first adjusting opening, and descending can be achieved. The device has the advantages that the rope mounting sequence can be effectively controlled, wrong mounting is avoided, and meanwhile the descending speed is conveniently controlled.

Description

Technical Field

[0001] The utility model relates to the field of mountaineering and rock climbing rescue equipment, in particular to a descender. Background Art

[0002] A descender is a protector used to protect operators (sometimes trapped persons) in sports (outward bound training, mountaineering, extreme sports, outdoor activities, etc.) and rescue operations, and is also called a "descender". In contrast to an ascender, it increases the friction on the rope (cable, rail) to enhance the buffering effect, thereby achieving the purpose of "slow descent". Common descenders include stop descender protectors, rescue 8, MPD (multi-function pulley), etc. The descender itself has two installation ports (rope inlet and outlet). When installing the rope, the upper end of the rope is the load end and the lower end is the free end, so traditional descenders are prone to incorrect installation. Utility Model Content

[0003] Based on the above problems, the purpose of the utility model is to provide a descender which can effectively control the installation sequence of ropes, avoid installation errors and facilitate control of the descent speed.

[0004] In view of the above problems, the following technical solutions are provided: a descender comprises a main body, a mounting cavity is provided in the front of the main body, a mounting cover is also provided in the front of the main body which is hinged to the main body so that it can be flipped open in the horizontal direction in front of the main body to open the mounting cavity, a mounting opening which is communicated with the mounting cavity is provided on the side of the main body, a swing block which is hinged to the rear side wall of the mounting cavity is provided in the mounting cavity, one side of the swing block extends to the mounting opening and forms a first adjustment opening at the mounting opening at the upper position of the swing block and forms a second adjustment opening at the lower position of the swing block, when the swing block swings along the hinge point, the sizes of the first adjustment opening and the second adjustment opening change in inverse proportion to each other, and a A one-way pulley, wherein the rotation axis of the one-way pulley is parallel to the swing axis of the pendulum block, and the one-way pulley is in a locked state when the rope moves from the first adjusting port through the installation cavity to the second adjusting port and contacts the one-way pulley; the pendulum block is also provided with a baffle, which is located at the second adjusting port and is arranged on one side close to the installation cover; an adjustment handle is hinged at the rear of the main body, and an adjustment groove is provided on a side of the pendulum block facing the rear of the main body, and the adjustment handle is provided with an adjustment pin that passes through the main body and is adapted to the adjustment groove, and when the adjustment handle swings, it drives the adjustment pin to draw an arc to drive the pendulum block to swing to assist in controlling the size between the first adjusting port and the second adjusting port.

[0005] In the above structure, when the pendulum block is in use, the pendulum block is moved to expand the second adjusting opening, and the lower end of the rope is placed in the second adjusting opening. Then, the pendulum block is moved to shrink the second adjusting opening and the rope is blocked by the blocking piece. At the same time, the first adjusting opening is expanded, and the rope passes through the first adjusting opening after contacting the one-way pulley through the installation cavity. At this time, when descending, the lower end of the rope will pass through the first adjusting opening, the installation cavity and the one-way pulley, and the second adjusting opening will achieve deceleration or suspension. If the lower end of the rope is first loaded into the first adjusting opening, the size of the first adjusting opening is occupied by the rope, which makes the pendulum block unable to swing toward the first adjusting opening, and also makes the second adjusting opening unable to expand. At the same time, the existence of the baffle restricts the installation of the rope into the second adjusting port. Therefore, when the installation sequence of the rope is wrong, the direction of the rope in the installation cavity will be opposite, which will make it impossible to achieve the purpose of descent deceleration or hovering and cause safety hazards. The existence of the baffle effectively achieves the anti-foolproof purpose; since there is friction between the rope and the one-way pulley during descent, the friction force can be converted into the swing force of the pendulum block, which makes the pendulum block swing toward the first adjusting port and clamp the rope to achieve the purpose of hovering. If unlocking is required, only the adjusting handle needs to be pulled to manually control the pendulum block to swing toward the second adjusting port to loosen the rope in the first adjusting port to achieve descent.

[0006] The utility model is further configured such that an upper friction block is provided on the upper side wall of the first adjustment opening away from the swing block, and a lower friction block is provided on the lower side wall of the second adjustment opening away from the swing block.

[0007] In the above structure, the upper friction block and the lower friction block are used as wear parts for contacting and rubbing with the rope.

[0008] The utility model is further configured that the upper friction block is provided with an upper groove; and the lower friction block is provided with a lower groove.

[0009] In the above structure, the friction area with the rope can be increased and the damage to the rope can be reduced.

[0010] The utility model is further configured such that the axis of the hinged connection between the pendulum block and the rear side wall of the installation cavity is the pendulum block axis, the axis of the rotation of the one-way pulley relative to the pendulum block is the pulley axis, and the one-way pulley is sleeved outside the pendulum block axis and its pulley axis is eccentrically arranged with respect to the pendulum block axis.

[0011] In the above structure, the eccentric setting can amplify the torque transmitted to the pendulum block when the one-way pulley is one-way locked.

[0012] The utility model is further configured such that the swing block shaft is located above the pulley shaft.

[0013] In the above structure, the swing force transmitted to the swing block by the one-way pulley when the one-way pulley stops rotating is reasonable and reliable.

[0014] The utility model is further configured such that an arc groove is provided at the rear of the main body for giving way when the adjusting pin follows the swing of the adjusting handle; the adjusting groove includes a swing block arc groove centered on the swing axis of the adjusting handle and opening from the first adjusting port toward the second adjusting port, and one end of the swing block arc groove close to the second adjusting port is provided with a sliding groove opening toward the swing center of the adjusting handle; when the handle swings, the end of the adjusting pin slides in the swing block arc groove and the sliding groove.

[0015] In the above structure, the arc groove of the pendulum block can allow the pendulum block to have space to swing freely when the adjusting handle is stationary. When the adjusting handle controls the swing of the adjusting pin, the adjusting pin pushes the pendulum block toward the second adjusting port after the adjusting pin reaches the junction with the sliding groove along the arc groove of the pendulum block to reduce the gripping force of the pendulum block on the rope in the first adjusting port, thereby realizing the unlocking and descent of the hovering. Since the swing axis of the pendulum block and the swing axis of the adjusting handle are not coaxial, the sliding groove can ensure that the adjusting pin drives the pendulum block while compensating for the interference caused by the non-coaxiality, and at the same time can provide different swing amplitudes for the pendulum block within the swing range of the adjusting handle, so that when the adjusting handle swings at a uniform speed, the amplitude of the pendulum block when swinging toward the second adjusting port gradually increases, which is more conducive to precise control.

[0016] The utility model is further configured as follows: the pendulum block is fixedly hinged to the main body via a pendulum block shaft, and one end of the pendulum block shaft facing the mounting cover is provided with a locking protrusion whose outer diameter is larger than the diameter of the pendulum block shaft; the mounting cover is provided with an anti-slip groove which is arc-shaped with the swing axis of the mounting cover as the center on one side facing the main body, and the cross-section of the anti-slip groove is T-shaped or dovetail-shaped and is adapted to the locking protrusion.

[0017] In the above structure, the locking protrusion and the anti-slip groove can be adapted to lock the installation cover to prevent it from deforming and turning away from the main body when subjected to force.

[0018] The utility model is further configured such that one end of the anti-slip groove is opened to the center position of the installation cover, and the other end passes through the side of the installation cover; an unlocking button is also provided at the center position of the installation cover for adapting to the locking protrusion to limit the swinging opening of the installation cover.

[0019] In the above structure, the unlocking button cooperates with the locking protrusion to lock the installation cover to prevent it from being turned over and unlocked.

[0020] The utility model is further configured that a lower mounting port is provided at the lower end of the main body.

[0021] In the above structure, the installation cover is provided with a lower cover opening, and the lower mounting opening corresponds to the lower cover opening when the installation cover is buckled.

[0022] The utility model is further configured that an upper mounting opening is provided at the upper end of the main body.

[0023] In the above structure, the upper mounting opening is opened in an arc shape along the swing center of the mounting cover as the axis, and the mounting cover is provided with an upper cover opening corresponding to the upper mounting opening; the upper mounting opening opened in an arc shape can smoothly flip the mounting cover without removing the mounted object.

[0024] The beneficial effects of the utility model are as follows: when the pendulum block is in use, the pendulum block is moved to expand the second adjusting opening, and the lower end of the rope is placed in the second adjusting opening, and then the pendulum block is moved to shrink the second adjusting opening while the rope is blocked by the blocking piece, and at the same time the first adjusting opening is expanded, and the rope passes through the first adjusting opening after contacting the one-way pulley through the installation cavity. At this time, when descending, the lower end of the rope will pass through the first adjusting opening, the installation cavity and the one-way pulley, and the second adjusting opening will achieve deceleration or suspension; if the lower end of the rope is first installed from the first adjusting opening, the size of the first adjusting opening is occupied by the rope, resulting in the pendulum block being unable to swing toward the first adjusting opening, which also causes the second adjusting opening to be It cannot be expanded. At the same time, the presence of the baffle restricts the installation of the rope into the second adjusting port. Therefore, when the installation sequence of the rope is wrong, the direction of the rope in the installation cavity will be opposite, resulting in the inability to achieve the purpose of descent deceleration or hovering, which creates a safety hazard. The presence of the baffle effectively achieves the anti-fool purpose. Since there is friction between the rope and the one-way pulley during descent, the friction force can be converted into the swinging force of the pendulum block, causing the pendulum block to swing toward the first adjusting port and clamp the rope to achieve the hovering purpose. If unlocking is required, only the adjusting handle needs to be pulled to manually control the pendulum block to swing toward the second adjusting port to loosen the rope in the first adjusting port to achieve descent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model from the first viewing angle.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model from a second viewing angle.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the installation cover of the utility model in the open state from the first viewing angle.

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the utility model in the second viewing angle when the installation cover is in the open state.

[0029] Figure 5 It is a schematic diagram of the fully cutaway three-dimensional structure of the installation cover of the utility model.

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the utility model when the swing block swings toward the first adjustment port.

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the utility model when the swing block swings toward the second adjustment port.

[0032] Figure 8It is a schematic diagram of the projection structure of the pendulum block of the utility model when locking the rope.

[0033] Fig. 9 It is a schematic diagram of the projection structure when the pendulum block of the utility model begins to be unlocked.

[0034] Fig.10 It is a schematic diagram of the projection structure when the pendulum block of the utility model is unlocked.

[0035] Meaning of the numbers in the figure: 10-main body; 101-installation cavity; 102-first adjustment port; 103-second adjustment port; 104-upper friction block; 1041-upper groove; 105-lower friction block; 1051-lower groove; 106-arc groove; 107-lower mounting port; 108-upper mounting port; 11-installation cover; 111-anti-slip groove; 112-unlocking button; 113-lower cover port; 114-upper cover port; 12-swing block; 121-one-way pulley; 122-block; 123-adjustment groove; 1231-swing block arc groove; 1232-slide groove; 124-swing block shaft; 1241-locking protrusion; 125-pulley shaft; 13-adjustment handle; 131-adjustment pin; a-rope. DETAILED DESCRIPTION

[0036] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] refer to Figures 1 to 10 ,like Figures 1 to 10The descender shown in the figure comprises a main body 10, a mounting cavity 101 is provided in front of the main body 10, a mounting cover 11 is also provided in front of the main body 10 which is hinged to the main body 10 so that it can be flipped open in the horizontal direction in front of the main body 10 to open the mounting cavity 101, a mounting opening which is communicated with the mounting cavity 101 is provided on the side of the main body 10, a swing block 12 which is hinged to the rear side wall of the mounting cavity 101 is provided in the mounting cavity 101, one side of the swing block 12 extends to the mounting opening and forms a first adjustment opening 102 at the mounting opening at the upper position of the swing block 12 and forms a second adjustment opening 103 at the lower position of the swing block 12, when the swing block 12 swings along the hinge point, the sizes of the first adjustment opening 102 and the second adjustment opening 103 change inversely proportional to each other, a one-way pulley 121 is also hinged on the swing block 12, and the one-way pulley 121 The rotation axis is parallel to the swing axis of the pendulum block 12. When the rope a moves from the first adjustment port 102 to the second adjustment port 103 through the installation cavity 101, the one-way pulley 121 contacts the one-way pulley 121 and the one-way pulley 121 is in a locked state; the pendulum block 12 is also provided with a baffle 122, which is located at the second adjustment port 103 and close to the side of the installation cover 11; an adjustment handle 13 is hinged at the rear of the main body 10, and an adjustment groove 123 is provided on the side of the pendulum block 12 facing the rear of the main body 10. The adjustment handle 13 is provided with an adjustment pin 131 that passes through the main body 10 and is adapted to the adjustment groove 123. When the adjustment handle 13 swings, it drives the adjustment pin 131 to draw an arc to drive the pendulum block 12 to swing to assist in controlling the size between the first adjustment port 102 and the second adjustment port 103.

[0038] In the above structure, when the pendulum block 12 is in use, the pendulum block 12 is moved to expand the second adjustment opening 103, and the lower end of the rope a is placed in the second adjustment opening 103, and then the pendulum block 12 is moved to shrink the second adjustment opening 103, and the rope a is blocked by the blocking piece 122, and at the same time the first adjustment opening 102 is expanded, and the rope a passes through the first adjustment opening 102 after contacting the one-way pulley 121 through the installation cavity 101. At this time, when descending, the lower end of the rope a will pass through the first adjustment opening 102, the installation cavity 101 and the one-way pulley 121, and the second adjustment opening 103 will achieve deceleration or suspension; if the lower end of the rope a is first installed from the first adjustment opening 102, the size of the first adjustment opening 102 is occupied by the rope a, which causes the pendulum block 12 to be unable to swing toward the first adjustment opening 102, which also leads to The second adjustment opening 103 cannot be expanded. At the same time, the existence of the baffle 122 restricts the rope a from being installed in the second adjustment opening 103. Therefore, when the installation sequence of the rope a is wrong, the direction of the rope a in the installation cavity 101 will be opposite, resulting in the inability to achieve the purpose of descent deceleration or hovering, thereby causing a safety hazard. The existence of the baffle 122 effectively achieves the anti-foolproof purpose. Since there is friction between the rope a and the one-way pulley 121 during descent, the friction force can be converted into the swinging force of the pendulum block 12, causing the pendulum block 12 to swing toward the first adjustment opening 102 and clamp the rope a to achieve the hovering purpose. If unlocking is required, only the adjustment handle 13 needs to be manually pulled to control the pendulum block 12 to swing toward the second adjustment opening 103 to loosen the rope a in the first adjustment opening 102 to achieve descent.

[0039] In this embodiment, an upper friction block 104 is provided on the upper side wall of the first adjustment opening 102 away from the pendulum block 12 , and a lower friction block 105 is provided on the lower side wall of the second adjustment opening 103 away from the pendulum block 12 .

[0040] In the above structure, the upper friction block 104 and the lower friction block 105 are used as wear parts to contact and rub against the rope a.

[0041] In this embodiment, the upper friction block 104 is provided with an upper groove 1041 ; the lower friction block 105 is provided with a lower groove 1051 .

[0042] In the above structure, the friction area with the rope a can be increased, and the damage to the rope a can be reduced.

[0043] In this embodiment, the axis of the hinged connection between the pendulum block 12 and the rear side wall of the installation cavity 101 is the pendulum block shaft 124, the axis of the rotation of the one-way pulley 121 relative to the pendulum block 12 is the pulley shaft 125, and the one-way pulley 121 is sleeved outside the pendulum block shaft 124, and its pulley shaft 125 is eccentrically arranged with respect to the pendulum block shaft 124.

[0044] In the above structure, the eccentric setting can amplify the torque transmitted to the pendulum block 12 when the one-way pulley 121 is one-way locked.

[0045] In this embodiment, the pendulum block shaft 124 is located above the pulley shaft 125 .

[0046] In the above structure, the swing force transmitted to the swing block 12 by the one-way pulley 121 when the one-way pulley 121 stops rotating is reasonable and reliable.

[0047] In this embodiment, an arc groove 106 is provided at the rear of the main body 10 for making way when the adjusting pin 131 follows the swing of the adjusting handle 13; the adjusting groove 123 includes a swing block arc groove 1231 centered on the swing axis of the adjusting handle 13 and opened from the first adjusting port 102 to the second adjusting port 103, and the end of the swing block arc groove 1231 close to the second adjusting port 103 is provided with a sliding groove 1232 opened in the direction of the swing center of the adjusting handle 13; when the adjusting handle 13 swings, the end of the adjusting pin 131 slides in the swing block arc groove 1231 and the sliding groove 1232.

[0048] In the above structure, the arc groove 1231 of the pendulum block can allow the pendulum block 12 to have space to swing freely when the adjusting handle 13 is stationary. When the adjusting handle 13 controls the adjusting pin 131 to swing, the adjusting pin 131 reaches the junction with the sliding groove 1232 along the arc groove 1231 of the pendulum block and pushes the pendulum block 12 to move toward the second adjusting port 103 to reduce the gripping force of the pendulum block 12 on the rope a in the first adjusting port 102, thereby realizing the unlocking and descent of the hovering. Since the swing axis of the pendulum block 12 is not coaxial with the swing axis of the adjusting handle 13, the sliding groove 1232 can ensure that the adjusting pin 131 drives the pendulum block 12 while compensating for the interference caused by the non-coaxiality, and at the same time can provide different swing amplitudes for the pendulum block 12 within the swing range of the adjusting handle 13, so that when the adjusting handle 13 swings at a uniform speed, the amplitude of the pendulum block 12 when swinging toward the second adjusting port 103 gradually increases, which is more conducive to precise control.

[0049] In this embodiment, the pendulum block 12 is fixedly hinged to the main body 10 via a pendulum block shaft 124, and the end of the pendulum block shaft 124 facing the mounting cover 11 is provided with a locking protrusion 1241 whose outer diameter is larger than the diameter of the pendulum block shaft 124; the mounting cover 11 is provided with an anti-slip groove 111 which is arc-shaped with the swing axis of the mounting cover 11 as the center on the side facing the main body 10, and the cross-section of the anti-slip groove 111 is T-shaped or dovetail-shaped and is adapted to the locking protrusion 1241.

[0050] In the above structure, the locking protrusion 1241 is adapted to the anti-slip groove 111 to lock the installation cover 11, so as to prevent the cover 11 from deforming and turning away from the main body 10 when subjected to force.

[0051] In this embodiment, one end of the anti-slip groove 111 is opened to the center position of the installation cover 11, and the other end passes through the side of the installation cover 11; an unlocking button 112 is also provided at the center position of the installation cover 11 for adapting to the locking protrusion 1241 to limit the swinging opening of the installation cover 11.

[0052] In the above structure, the unlocking button 112 cooperates with the locking protrusion 1241 to lock the installation cover 11 to prevent it from being turned over and unlocked.

[0053] In this embodiment, a lower mounting opening 107 is provided at the lower end of the main body 10 .

[0054] In the above structure, the installation cover 11 is provided with a lower cover opening 113 , and when the installation cover 11 is buckled, the lower mounting opening 107 corresponds to the lower cover opening 113 .

[0055] In this embodiment, an upper mounting opening 108 is disposed at the upper end of the main body 10 .

[0056] In the above structure, the upper mounting opening 108 is opened in an arc shape along the swing center of the mounting cover 11 as the axis, and the mounting cover 11 is provided with an upper cover opening 114 corresponding to the upper mounting opening 108; the upper mounting opening 108 opened in an arc shape can smoothly flip the mounting cover 11 without removing the hanging object.

[0057] The beneficial effects of the utility model are as follows: when the pendulum block 12 is in use, the pendulum block 12 is moved to expand the second adjustment opening 103, and the lower end of the rope a is placed in the second adjustment opening 103, and then the pendulum block 12 is moved to shrink the second adjustment opening 103, and the rope a is blocked by the blocking piece 122, and at the same time the first adjustment opening 102 is expanded, and the rope a passes through the first adjustment opening 102 after contacting the one-way pulley 121 through the installation cavity 101. At this time, when descending, the lower end of the rope a will pass through the first adjustment opening 102, the installation cavity 101 and the one-way pulley 121, and the second adjustment opening 103 will be decelerated or suspended; if the lower end of the rope a is first inserted into the first adjustment opening 102, the size of the first adjustment opening 102 is occupied by the rope a, resulting in the pendulum block 12 being unable to swing toward the first adjustment opening 102. This means that the second adjustment opening 103 cannot be expanded. At the same time, the presence of the baffle 122 limits the installation of the rope a into the second adjustment opening 103. Therefore, when the installation sequence of the rope a is wrong, the direction of the rope a in the installation cavity 101 will be opposite, resulting in the inability to achieve the purpose of descent deceleration or hovering, which creates a safety hazard. The presence of the baffle 122 effectively achieves the anti-foolproof purpose. Since there is friction between the rope a and the one-way pulley 121 during descent, the friction force can be converted into the swinging force of the pendulum block 12, causing the pendulum block 12 to swing toward the first adjustment opening 102 and clamp the rope a to achieve the hovering purpose. If unlocking is required, only the adjustment handle 13 needs to be manually pulled to control the pendulum block 12 to swing toward the second adjustment opening 103 to loosen the rope a in the first adjustment opening 102 to achieve descent.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A descender, comprising a main body, a mounting cavity is provided in front of the main body, a mounting cover is provided in front of the main body, which is hinged to the main body and flipped open in the horizontal direction in front of the main body to open the mounting cavity, and a mounting port is provided on the side of the main body to communicate with the mounting cavity, characterized in that: The mounting cavity is provided with a pendulum block hinged to the rear side wall of the mounting cavity, one side of the pendulum block extends to the mounting opening and forms the mounting opening at the upper position of the pendulum block into a first adjusting opening while forming the mounting opening at the lower position of the pendulum block into a second adjusting opening. When the pendulum block swings along the hinge point, the sizes of the first adjusting opening and the second adjusting opening change inversely proportional to each other. The pendulum block is also hinged with a one-way pulley, the rotation axis of the one-way pulley is parallel to the swing axis of the pendulum block, and the one-way pulley is in a locked state when the rope moves from the first adjusting opening through the mounting cavity to the second adjusting opening. The pendulum block is also provided with a baffle, which is located at the position of the second adjusting opening and is arranged on one side close to the mounting cover. An adjusting handle is hinged at the rear of the main body, and an adjusting slot is provided on a side of the pendulum block facing the rear of the main body. The adjusting handle is provided with an adjusting pin that passes through the main body and is adapted to the adjusting slot. When the adjusting handle swings, the adjusting pin is driven to draw an arc to drive the pendulum block to swing to assist in controlling the size between the first adjusting opening and the second adjusting opening.

2. A descender according to claim 1, characterized in that: An upper friction block is provided on the upper side wall of the first adjustment opening away from the swing block, and a lower friction block is provided on the lower side wall of the second adjustment opening away from the swing block.

3. A descender according to claim 2, characterized in that: The upper friction block is provided with an upper groove; the lower friction block is provided with a lower groove.

4. A descender according to claim 1, characterized in that: The axis of the swing block and the rear side wall of the installation cavity is hinged to the swing block axis, the axis of the one-way pulley rotating relative to the swing block is the pulley axis, and the one-way pulley is sleeved outside the swing block axis and its pulley axis is eccentrically arranged with the swing block axis.

5. A descender according to claim 4, characterized in that: The pendulum block shaft is located above the pulley shaft.

6. A descender according to claim 1, characterized in that: An arc groove is provided at the rear of the main body for giving way when the adjusting pin follows the swing of the adjusting handle; the adjusting groove includes a swing block arc groove centered on the swing axis of the adjusting handle and opening from the first adjusting port to the second adjusting port, and a sliding groove is provided at one end of the swing block arc groove close to the second adjusting port and opening in the direction of the swing center of the adjusting handle; when the handle swings, the end of the adjusting pin slides in the swing block arc groove and the sliding groove.

7. A descender according to claim 1 or 4, characterized in that: The pendulum block is fixedly hinged to the main body via a pendulum block shaft, and one end of the pendulum block shaft facing the mounting cover is provided with a locking protrusion with an outer diameter larger than the diameter of the pendulum block shaft; the mounting cover is provided with an anti-slip groove which is arc-shaped with the swing axis of the mounting cover as the center on one side facing the main body, and the cross-section of the anti-slip groove is T-shaped or dovetail-shaped and is adapted to the locking protrusion.

8. A descender according to claim 7, characterized in that: One end of the anti-slip groove is opened to the center of the installation cover, and the other end passes through the side of the installation cover; an unlocking button for matching with the locking protrusion to limit the swinging opening of the installation cover is also provided at the center of the installation cover.

9. A descender according to claim 1, characterized in that: A lower mounting opening is provided at the lower end of the main body.

10. A descender according to claim 9, characterized in that: An upper mounting opening is arranged at the upper end of the main body.

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