CN215048305U - Manual brake releasing wrench - Google Patents

Abstract

The utility model relates to an elevator inspection tool, concretely relates to manual brake release spanner, including first arm, second arm and regulation pole, first arm and second arm are articulated each other, and the regulation pole is installed on first arm along axial position adjustably, is equipped with on the first arm and moves into and returns to stop the subassembly, and the regulation pole inserts to move into and returns to stop the subassembly along axial position; when the first arm and the second arm rotate to be opened, the second arm is abutted to the brake arm, one end of the adjusting rod is abutted to the coil cover and the brake arm is opened to be far away from the coil cover. The utility model discloses a be equipped with on first arm and move into returning and stop the subassembly, adjust the pole and insert to move into returning and stop the subassembly through the mode of pegging graft and carry out the work interval and adjust along axial position, the back is stopped the subassembly and is carried out one-way fixed to regulating stem length after the work interval has been adjusted, and the spanner that declutches this moment can carry out normal use. The manual brake release wrench has the advantages that the manual brake release wrench can be quickly adjusted to work space in the brake through the moving, feeding and stopping assembly, adjusting time is shortened, and inspection work efficiency is improved.

Description

Manual brake releasing wrench

Technical Field

The utility model relates to an elevator inspection tool, concretely relates to manual brake release spanner.

Background

The brake is an important safety part of the elevator, and once the brake fails, the brake can cause severe consequences such as the squat of the elevator car, the top rushing and the door opening operation so as to cause personnel to be sheared and injured. The brake system of the elevator should therefore have, in addition to the electric brake, an electromechanical friction brake which has both parking and service brake functions.

The main types of elevator brakes are drum and disc type, drum brakes, which are commonly used in asynchronous motor hoists and most synchronous motor hoists due to their simple structure and low cost, including most freight elevators and a considerable number of passenger elevators. Of these drum brakes, most designs are equipped with only one set of manual brake release devices, except that a few synchronous machines use block-type drum brakes installed separately on both sides, and fig. 1 shows the most common type of elevator drum brake.

In the elevator manufacturing and installation safety code (GB7588-2003), the following is specified for the electromechanical brake of an elevator:

when the car is loaded with 125% of the rated load and is moving downward at the rated speed, the brake should be operated to stop the traction machine. In the above case the deceleration of the car should not exceed the deceleration caused by the safety gear action or the car hitting the buffer.

All brake mechanisms participating in applying a braking force to the brake wheel or disc should be installed in groups. If one of the components is not functioning, there should still be sufficient braking force to decelerate a car carrying a rated load descending at a rated speed.

An elevator drive machine equipped with a manual emergency operating device should be able to release the brake by hand and require a constant force to maintain its released state.

Thus, as an important safety component of an elevator, GB7588-2003 has a certain safety redundancy requirement on the braking capacity of an elevator brake, and when the brake works normally, a lift car carrying 125% of rated load can stop running of a traction machine descending at the rated speed; in terms of reliability, mechanical parts are required to be installed in groups, and if one of the mechanical parts fails, the other mechanical part still has enough braking force to decelerate the cage carrying the rated load descending at the rated speed. When the brake release spanner 6 is in a natural state, the brake shoes 3 of 2 (or more) groups of independent brakes are kept in a contracting state.

In daily inspection of an elevator brake, we have found that some of the brakes shown in fig. 1 are in a state where only one group of brake devices works due to excessive wear of the brake shoe 3 caused by improper adjustment or long-term brake operation of the brake, and in an initial stage where only one group of brake devices works, the elevator can often work normally, because the working gap between the brake shoe 3 and the brake hub 1 is small, a group of brake shoes 3 which fail often appear to be still attached to the brake hub 1 during elevator braking, the above situation cannot be found easily by visual observation, and when overload occurs or another group of brakes also has problems, an elevator safety accident can be caused.

In the test process of testing the braking capability of the drum brake, because two groups of mechanical components of the brake act simultaneously, the braking capability of the mechanical component of the single group of brake required in 12.4.2.1 of GB7588-2003 cannot be verified, and if the performance of the single group of mechanical components is reduced or completely fails, the test method is difficult to find according to the current braking test method.

The reason is related to the structural characteristics of the brake, as shown in fig. 1, when the brake is powered off, under the action of the compression spring 4, the brake arm 2 provided with the brake shoe 3 and the brake release gap adjusting bolt 8 is limited by 2 mechanical elements, one of which is limited by the brake hub 1 through the brake shoe 3; the other is that the gap adjusting bolt 8 is limited by the iron core 9 by releasing the brake, or 2 limiting elements are all acted. Under normal operation of the brake, when the brake is powered off, the brake shoe 3 mounted on the brake arm 2 is limited only by the brake hub 1 (as shown in the left group of mechanical parts in fig. 2), that is, the brake shoe 3 is tightly attached to the brake hub 1 to brake the brake hub 1 (d1 is zero), and the brake release gap adjusting bolt 8 mounted on the brake arm 2 is not in contact with the iron core 9, but keeps a small gap (c 1 in fig. 2), however, if the brake is improperly adjusted or the brake shoe 3 is excessively worn, when the brake is powered off, under the action of the compression spring 4, the brake release gap adjusting bolt 8 mounted on the brake arm 2 is limited by the iron core 9 on the right side (c 2 is zero in fig. 2), so that the brake shoe 3 is not in contact with the brake hub 1, that there is a gap (d 2 in fig. 2), or when the brake is powered off, the brake arm 2 is in contact with the iron core 9 and the brake hub 1 at the same time, this leaves a considerable safety risk for elevator operation.

The existing single-group manual brake release spanner of a drum brake mainly comprises a screw type and a ratchet screw type, and the two manual brake release spanners have the following defects in the using process:

the screw type, because the difference in the aspect such as elevator brand and model specification of using, the interval between brake arm and the coil end cover also is different, in order to adapt to the stopper of different intervals, need rotate adjusting screw in order to change the interval, when the interval difference of different stoppers is great, the time of rotatory adjusting screw is corresponding also longer, obviously influences inspection work efficiency.

The ratchet bar screw type has a complex manufacturing process, and the ratchet bar is required to be pushed to the approximate length of the working distance in each test, and then the screw is rotated to the accurate length of the working distance, so that the working distance can be adjusted by the two actions, and the inspection working efficiency is also influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a manual brake release spanner, the work interval of quick adjustment spanner in the stopper improves inspection work efficiency.

In order to achieve the above object, the present invention provides a manual brake releasing wrench, which includes a first arm, a second arm and an adjusting rod, wherein the first arm and the second arm are hinged to each other, the adjusting rod is adjustably mounted on the first arm along an axial position, the first arm is provided with a dynamic-in and dynamic-back stopping assembly, and the adjusting rod is inserted into the dynamic-in and dynamic-back stopping assembly along the axial position; when the first arm and the second arm rotate and are opened, the second arm is abutted to the brake arm, one end of the adjusting rod is abutted to the coil cover and is used for opening the brake arm to be far away from the coil cover.

Furthermore, the first arm is provided with a mounting groove, and the movable advancing and stopping assembly comprises a wedge block and a wedge blockCompression spring barThe wedge block is arranged on one side of the mounting groove, the compression spring strip limits the wedge block in the mounting groove, a movable gap is reserved between the compression spring strip and the wedge block, a sliding inclined plane is arranged on the side wall of the mounting groove, a slot is formed in one side of the wedge block, one end of the wedge block is suitable for abutting against the adjusting rod, and the other end of the wedge block abuts against the sliding inclined plane; when the adjusting rod retreats in the slot, the adjusting rod drives the wedge block to move under the action of friction force, and the wedge block moves slightly on the sliding inclined plane and then clamps and fixes the adjusting rod.

Furthermore, the movable advancing and returning stop device comprises at least two groups of movable advancing and returning stop components, the movable advancing and returning stop components of each group are symmetrically arranged, and the slots are formed between the wedges of each group.

Further, the dynamic-advancing and back-stopping assembly further comprises a roller, and the roller is located between the wedge block and the sliding inclined surface.

Furthermore, a transverse groove and a vertical groove which are used for limiting and installing the compression spring strips are arranged on the first arm, and the transverse groove is communicated with the vertical groove and is vertically arranged.

Furthermore, a limiting groove is formed in the wedge block, a limiting protrusion inserted into the limiting groove is formed in the compression spring strip, and a movable gap is reserved between the limiting groove and the limiting protrusion.

Furthermore, a guide block is arranged on the first arm, a guide groove for embedding the guide block is formed in the wedge block, and a movable gap is reserved between the guide block and the guide groove.

Furthermore, the first arm includes a first driving lever and a first driving lever which are respectively located at two ends of the first arm, the second arm includes a second driving lever with one end corresponding to the first driving lever and a second driving lever located at the other end, a pressing portion which is matched with the braking arm in a propping manner is arranged on the second driving lever, and a avoiding hole for the adjusting rod to transversely pass through is arranged on the second driving lever.

Furthermore, a force application mechanism for driving the first arm and the second arm to swing is further arranged between the first driving rod and the second driving rod.

Furthermore, the force application mechanism comprises a first force application arm and a second force application arm, one end of the first force application arm is rotatably connected with the outer end of the first driving rod, and one end of the second force application arm is rotatably connected with the outer end of the second driving rod; the first force applying arm and the second force applying arm are rotationally connected, and the first arm and the second arm are driven to swing when the first force applying arm and the second force applying arm swing; the rotation axes of the first force applying arm and the second force applying arm are positioned between the first force applying arm and the second force applying arm and are close to the first arm and the second arm, and the first arm and the second arm are driven to be opened when the first force applying arm and the second force applying arm are close to each other; or the first force applying arm and the second force applying arm are rotatably arranged in a crossed manner.

The beneficial effects of the utility model reside in that:

1. the working interval of the brake release wrench in the prior art is adjusted by rotating the adjusting screw, and when the interval difference of different brakes is large, the time for rotating the adjusting screw is correspondingly long, so that the inspection working efficiency is obviously influenced. The utility model discloses a be equipped with on first arm and move into returning and stop the subassembly, adjust the pole and insert to move into returning and stop the subassembly through the mode of pegging graft and carry out the work interval and adjust along axial position, the back is stopped the subassembly and is carried out one-way fixed to regulating stem length after the work interval has been adjusted, and the spanner that declutches this moment can carry out normal use. The manual brake release wrench has the advantages that the manual brake release wrench can be quickly adjusted to work space in the brake through the moving, feeding and stopping assembly, adjusting time is shortened, and inspection work efficiency is improved.

2. When the adjusting rod is inserted into the slot, the friction resistance between the adjusting rod and the slot is small, and the adjusting rod can extend into the slot by any length to realize stepless adjustment. When the adjusting rod moves back in the slot, the adjusting rod drives the wedge block to move under the action of friction force, the wedge block moves slightly on the sliding inclined plane to clamp and fix the adjusting rod, and the adjusting rod is locked at the moment, so that the adjusting rod only can move forward and cannot move back. When the brake releasing wrench is used, one end of the second arm is abutted to the brake arm, then the adjusting rod is inserted, the adjusting rod is pushed to enable one end of the adjusting rod to be abutted to the coil cover, and the brake releasing wrench is installed in place.

3. Through setting up at least two sets of move and advance to stop the subassembly back, increase the frictional force between voussoir and the regulation pole, can be to better returning the lock death of adjusting the pole, avoid adjusting the pole activity.

4. The movable advancing and returning stopping assembly further comprises a roller, the roller is located between the wedge block and the sliding inclined plane, friction force between the wedge block and the sliding inclined plane is reduced due to the arrangement of the roller, the adjusting rod can be conveniently and smoothly inserted into the slot and can move towards the direction of the coil cover, and the adjusting rod can be conveniently self-locked immediately when returning.

5. The first arm is provided with a guide block, the wedge block is provided with a guide groove for embedding the guide block, and a movable gap is reserved between the guide block and the guide groove. Through the setting of guide block and guide way, inject the position of voussoir, avoid the voussoir to remove the back position and take place too big skew, lead to adjusting the pole and can't inject the slot the second time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a first state view of a prior art brake;

FIG. 2 is a second state diagram of the prior art brake;

fig. 3 is a first state view of a manual brake release wrench according to an embodiment of the present invention;

FIG. 4 is a projection view in the direction A of FIG. 3;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

fig. 6 is a second state view of a manual brake release wrench according to an embodiment of the present invention.

Description of reference numerals:

1. braking the hub; 2. a brake arm; 3. a brake shoe; 4. a compression spring; 5. a bidirectional brake releasing rotating shaft; 6. releasing the brake; 7. releasing the brake coil; 8. a brake release gap adjusting bolt; 9. and (3) an iron core.

10. A first arm; 11. a first shift lever; 12. a first driving rod; 13. mounting grooves; 131. a sliding ramp; 14. a slot; 15. a guide block; 16. a transverse groove; 17. a vertical slot; 20. a second arm; 21. a second deflector rod; 211. a pressing part; 212. avoiding holes; 22. a second driving rod; 30. adjusting a rod; 40. a coil cover; 50. a brake arm; 60. a force application mechanism; 61. a first force application arm; 62. a second force application arm; 70. a moving-in and returning-stopping component; 71. a wedge block; 711. a limiting groove; 712. a guide groove; 72. a roller; 73. compressing the spring strip; 731. and a limiting bulge.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 3-6, a manual brake release wrench provided as an embodiment of the present invention includes a first arm 10, a second arm 20, and an adjusting rod 30, the first arm 10 and the second arm 20 are hinged to each other, the adjusting rod 30 is adjustably mounted on the first arm 10 along an axial position, the first arm 10 is provided with a moving in and returning to stop assembly 70, and the adjusting rod 30 is inserted into the moving in and returning to stop assembly 70 along the axial position; when the first arm 10 and the second arm 20 are rotated and opened, the second arm 20 abuts against the brake arm 50, and one end of the adjustment lever 30 abuts against the coil cover 40 to spread the brake arm 50 away from the coil cover 40.

The working interval of the brake release wrench in the prior art is adjusted by rotating the adjusting screw, and when the interval difference of different brakes is large, the time for rotating the adjusting screw is correspondingly long, so that the inspection working efficiency is obviously influenced. The utility model discloses a be equipped with on first arm 10 and move into returning and stop subassembly 70, adjust pole 30 and insert to move into returning and stop subassembly 70 through the mode of pegging graft and carry out the working distance and adjust along axial position, the back is stopped the subassembly and is carried out one-way fixed to adjusting pole 30 length after the working distance is adjusted, and the spanner that declutches this moment can carry out normal use. Through the moving forward and backward stop assembly 70, the working distance of the manual brake releasing wrench in the brake can be quickly adjusted, the adjusting time is shortened, and the inspection working efficiency is improved.

Specifically, the first arm 10 includes a first driving lever 11 and a first driving lever 12 respectively located at two ends thereof, the second arm 20 includes a second driving lever 21 having one end corresponding to the first driving lever 11 and a second driving lever 22 located at the other end, and the second driving lever 21 is provided with a pressing portion 211 which is in pressing fit with the braking arm 50. The first driving lever 11 is provided with a mounting groove 13, the moving-in and moving-back stopping assembly 70 comprises a wedge block 71 and a compression spring bar 73, the wedge block 71 is arranged on one side of the mounting groove 13, the compression spring bar 73 limits the wedge block 71 in the mounting groove 13, a movable gap is reserved between the compression spring bar 73 and the wedge block 71, the side wall of the mounting groove 13 is provided with a sliding inclined surface 131, one side of the wedge block 71 is provided with a slot 14, one end of the wedge block 71 is suitable for abutting against the adjusting rod 30, and the other end of the wedge block 71 abuts against the sliding inclined surface 131; when the adjusting rod 30 advances in the slot 14, the adjusting rod 30 drives the wedge 71 to move and loosens the adjusting rod 30 under the action of friction force; when the adjusting rod 30 is retracted in the slot 14, the adjusting rod 30 drives the wedge 71 to move by the action of friction force, and the wedge 71 moves slightly on the sliding inclined surface 131 to clamp and fix the adjusting rod 30. When the adjusting rod 30 is inserted into the slot 14, the friction resistance between the adjusting rod 30 and the slot 14 is small, and the adjusting rod 30 can extend into the slot 14 by any length to realize stepless adjustment. When the adjusting rod 30 moves back in the slot 14, the adjusting rod 30 drives the wedge 71 to move under the action of friction force, the wedge 71 moves slightly on the sliding inclined surface 131 to clamp and fix the adjusting rod 30, and at the moment, the adjusting rod 30 is locked, so that the adjusting rod 30 only moves forwards but cannot move backwards. When the brake release wrench is used, one end of the second arm 20 is abutted to the brake arm 50, then the adjusting rod 30 is inserted, the adjusting rod 30 is pushed, one end of the adjusting rod 30 is abutted to the coil cover 40, and at the moment, the brake release wrench is installed in place.

As a variable embodiment, the movable in-and-out-and-back-stop assembly 70 may further adopt an elastic fixture block in the prior art, and at this time, the adjusting rod 30 is provided with a plurality of clamping teeth, and the clamping teeth are arranged in an inverted tooth structure, which can also satisfy the above-mentioned functions and effects, and has a disadvantage that such a structure cannot be adjusted steplessly.

Further, the manual brake releasing wrench comprises at least two groups of moving and returning and stopping assemblies 70, the moving and returning and stopping assemblies 70 of each group are symmetrically arranged, and a slot 14 is formed between wedges 71 of each group.

Specifically, in the present embodiment, two sets of moving-in and moving-back stopping assemblies 70 are provided, wherein the opposite surfaces of the two sets of wedges 71 are both flat surfaces, and a square slot 14 is formed between the two wedges 71. Through setting up two sets of move and advance to stop subassembly 70, increase the frictional force between voussoir 71 and the regulation pole 30, can be better to the regulation pole 30 back the lock and die, avoid adjusting pole 30 activity.

As a variant, four sets of moving and returning stop assemblies 70 may be provided, in which case the four sets of moving and returning stop assemblies 70 are disposed around the periphery of the slot 14.

Further, the moving-in and moving-back stopping assembly 70 further comprises a roller 72, the roller 72 is located between the wedge 71 and the sliding inclined surface 131, and the arrangement of the roller 72 reduces the friction force between the wedge 71 and the sliding inclined surface 131, so that the adjusting rod 30 can be smoothly inserted into the slot 14 and can move towards the coil cover 40, and the self-locking of the adjusting rod 30 can be realized immediately when the adjusting rod is retracted.

Specifically, the rollers 72 are in-line needles. The first shift lever 11 is provided with a transverse groove 16 and a vertical groove 17 for limiting and installing the compression spring strip 73, and the transverse groove 16 is communicated with the vertical groove 17 and is vertically arranged. The bottom of the compression spring bar 73 is positioned in the transverse groove 16, the side part of the compression spring bar is positioned in the vertical groove 17, the transverse groove 16 and the vertical groove 17 are arranged, the compression spring bar 73 is limited and installed, and meanwhile, the compression spring bar 73 is prevented from being convexly arranged and the normal use of the wrench is prevented from being influenced. The wedge 71 is provided with a limiting groove 711, the top of the compression spring bar 73 is provided with a limiting protrusion 731 inserted into the limiting groove 711, and a movable gap is reserved between the limiting groove 711 and the limiting protrusion 731. The compression spring 73 is arranged in a groove shape, so that parts of the roller 72 and the wedge 71 can be limited in the groove formed by the compression spring, and the roller 72 and the wedge 71 are limited.

Further, the first arm 10 is provided with a guide block 15, the wedge 71 is provided with a guide groove 712 into which the guide block 15 is inserted, and the guide block 15 and the guide groove 712 have a clearance therebetween. The guide block 15 and the guide groove 712 limit the position of the wedge 71, so that the situation that the position of the wedge 71 is excessively deviated after moving, and the adjusting rod 30 cannot be inserted into the slot 14 for the second time is avoided.

When the adjustable wrench is in a closed state, the adjusting rod 30 and the pressing part 211 of the wrench can respectively abut against the coil cover 40 and the braking arm 50 by adjusting the length of the adjusting rod 30 extending to the side away from the second shift lever 21 according to the distance between the braking arm 50 and the coil cover 40 of different elevators. When the wrench is opened, the adjusting rod 30 and the pressing part 211 are far away, the brake arm 50 is spread away from the coil cover 40, the brake shoe on the brake arm 50 is separated from the brake hub, and the brake performance of the brake arm 50 on the other side is tested. The adjusting rod 30 can be inserted between the brake arm 50 and the coil cover 40 of different elevators by adjusting the distance between the end far away from the second driving lever 21 and the pressing part 211, so that the universality of the brake releasing wrench is improved. In general, the pressing portion 211 is formed at an end position of the second lever 21 so as to be inserted between the brake arm 50 and the coil cover 40 and to be pressed against the brake arm 50, thereby occupying no space. The pressing portion 211 includes a step recessed in a corner of the end of the second lever 21, and the step is located on a side opposite to the first lever 11. The stepped shape facilitates insertion between the slot stop arm 50 and the coil cover 40, and also limits the insertion depth position for positioning.

Further, when the adjusting rod 30 is aligned with the second shift lever 21, in order to avoid the influence on the closing of the wrench when the adjusting rod 30 extends out to the side of the second shift lever 21 for too long, an avoiding hole 212 is formed in the second shift lever 21 for the adjusting rod 30 to pass through transversely. In other embodiments, the second driving lever 21 may be narrowed to avoid being aligned with the adjusting lever 30. In order to allow the adjusting rod 30 to extend out to one side of the second shift lever 21 and still allow the pressing portion 211 to be clamped into the side surface of the brake arm 50, the distance from the end of the second shift lever 21 to the rotation axis of the first arm 10 and the second arm 20 is greater than the distance from the end of the second shift lever 21 to the rotation axis of the first arm 10 and the second arm 20, so that the situation that the adjusting rod 30 is interfered to cause the side surface which cannot be clamped into the brake arm 50 is avoided.

Further, a force applying mechanism 60 for driving the first arm 10 and the second arm 20 to swing is further disposed between the first driving rod 12 and the second driving rod 22.

Specifically, the force applying mechanism 60 includes a first force applying arm 61 and a second force applying arm 62, wherein one end of the first force applying arm 61 is rotatably connected to the outer end of the first driving rod 12, and one end of the second force applying arm 62 is rotatably connected to the outer end of the second driving rod 22. The first force applying arm 61 and the second force applying arm 62 are rotatably connected to drive the first arm 10 and the second arm 20 to swing when the first force applying arm 61 and the second force applying arm 62 swing. The rotation axes of the first force applying arm 61 and the second force applying arm 62 are located between the first force applying arm 61 and the second force applying arm 62 and close to the first arm 10 and the second arm 20, and when the first force applying arm 61 and the second force applying arm 62 are close to each other, the first arm 10 and the second arm 20 are driven to open.

As a variant, the first arm 10 and the second arm 20 can also be swung by directly acting on the first drive rod 12 and the second drive rod 22 by hand. The first force applying arm 61 and the second force applying arm 62 can also be rotatably crossed.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (10)

1. A manual brake release wrench is characterized by comprising a first arm (10), a second arm (20) and an adjusting rod (30), wherein the first arm (10) and the second arm (20) are hinged to each other, the adjusting rod (30) is adjustably mounted on the first arm (10) along the axial position, a moving and returning stopping assembly (70) is arranged on the first arm (10), and the adjusting rod (30) is inserted into the moving and returning stopping assembly (70) along the axial position;

when the first arm (10) and the second arm (20) rotate and open, the second arm (20) is abutted against a brake arm (50), one end of the adjusting rod (30) is abutted against a coil cover (40) and the brake arm (50) is spread to be away from the coil cover (40).

2. A hand wrench as claimed in claim 1, wherein said first arm (10) is provided with a mounting slot (13), said advancing and retracting assembly (70) comprises a wedge (71) and a compression spring (73), said wedge (71) is provided on one side of said mounting slot (13), said compression spring (73) limits said wedge (71) in said mounting slot (13), a clearance is left between said compression spring (73) and said wedge (71), said mounting slot (13) is provided with a sliding slope (131) on the side wall, said wedge (71) is provided with a slot (14) on one side, one end of said wedge (71) is suitable for abutting against said adjusting rod (30), and the other end abuts against said sliding slope (131);

when the adjusting rod (30) retracts in the slot (14), the adjusting rod (30) drives the wedge block (71) to move under the action of friction force, and the wedge block (71) moves slightly on the sliding inclined plane (131) and then clamps and fixes the adjusting rod (30).

3. A hand wrench as claimed in claim 2, including at least two sets of said motion stop and retraction assemblies (70), said motion stop and retraction assemblies (70) of each set being symmetrically arranged, said wedges (71) of each set defining said slot (14) therebetween.

4. A hand operated brake release wrench according to claim 2, characterised in that the advancing and retracting assembly (70) further comprises a roller (72), the roller (72) being located between the wedge (71) and the sliding ramp (131).

5. A hand wrench as claimed in claim 2, wherein said first arm (10) is provided with a transverse slot (16) and a vertical slot (17) for limiting installation of said compression spring (73), said transverse slot (16) being in communication with said vertical slot (17) and being disposed vertically.

6. A hand wrench as claimed in claim 2, wherein said wedge (71) is provided with a limiting groove (711), said compression spring (73) is provided with a limiting protrusion (731) inserted into said limiting groove (711), and said limiting groove (711) and said limiting protrusion (731) have a clearance.

7. A hand wrench as claimed in claim 2, wherein said first arm (10) is provided with a guide block (15), said wedge (71) is provided with a guide groove (712) for insertion of said guide block (15), and said guide block (15) is spaced from said guide groove (712).

8. The manual brake-releasing wrench as claimed in claim 1, wherein the first arm (10) includes a first lever (11) and a first driving rod (12) respectively located at two ends thereof, the second arm (20) includes a second lever (21) having one end corresponding to the first lever (11) and a second driving rod (22) located at the other end, the second lever (21) is provided with a pressing portion (211) abutting against the braking arm (50), and the second lever (21) is provided with a relief hole (212) for the adjusting rod (30) to pass through transversely.

9. The hand brake release wrench according to claim 8, wherein a force applying mechanism (60) for driving the first arm (10) and the second arm (20) to swing is further provided between the first driving rod (12) and the second driving rod (22).

10. The manual brake release wrench of claim 9, wherein the force applying mechanism (60) includes a first force applying arm (61), a second force applying arm (62), one end of the first force applying arm (61) is rotatably connected to the outer end of the first actuating rod (12), and one end of the second force applying arm (62) is rotatably connected to the outer end of the second actuating rod (22);

the first force applying arm (61) and the second force applying arm (62) are connected in a rotating mode, and the first arm (10) and the second arm (20) are driven to swing when the first force applying arm (61) and the second force applying arm (62) swing;

the rotation axes of the first force applying arm (61) and the second force applying arm (62) are positioned between the first force applying arm (61) and the second force applying arm (62) and close to the first arm (10) and the second arm (20), and when the first force applying arm (61) and the second force applying arm (62) are close to each other, the first arm (10) and the second arm (20) are driven to be opened; or the first force applying arm (61) and the second force applying arm (62) are rotatably arranged in a crossed manner.

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