Compression spring reset type high-altitude shear

Abstract

The utility model provides a pair of pressure spring reset type high-altitude scissors. The pair of pressure spring reset type high-altitude scissors comprises a fixed blade, a movable blade, a center screw for connecting the fixed blade and the movable blade and a nut matched with the center screw, the fixed blade arm is connected with a handle; a fixed seat is arranged on the tail end side of the handle; a pull rope traction mechanism is arranged at the free ends of the fixed seat and the movable blade arm; a pressure spring positioning rod is connected between the movable blade arm and the fixed seat; the pressure spring positioning rod is a bent metal rod and is bent towards the central screw; the pressure spring positioning rod between the bending point and the fixed seat is parallel to the length direction of the handle, and a pressure spring clamping block is arranged in the middle of the pressure spring positioning rod; and the pressure spring sleeves the outer side of the pressure spring positioning rod between the pressure spring clamping block and the fixed seat. On one hand, the vertical distance between the pressure spring and the rotating fulcrum is reduced, on the other hand, the stress direction of the pressure spring is always consistent, and the service life of the pressure spring is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural pruning tools, in particular to a compression spring reset type aerial shears. Background Art

[0002] Branch pruning includes shaping pruning of young trees, light pruning and deep pruning of mature trees, heavy pruning of aging trees, etc. Aerial shears are usually needed when pruning taller plants and trees. Some existing aerial pruning shears, such as the multifunctional pruning device disclosed in the utility model patent with authorization announcement number CN 218570920 U, reset the scissors by setting an ordinary spring between the first handle and the second handle, and set a longer blade force arm to achieve the purpose of saving effort. The spring between the handles is difficult to position, and it is easy to have problems of weakened elasticity or reduced life when working repeatedly. The utility model patent with announcement number CN219981607U previously applied by the applicant discloses a torsion spring reset type pruning shears, which is reset by setting a flat steel torsion spring to achieve the purpose of saving manpower. Utility Model Content

[0003] Due to the above-mentioned defects in the prior art, the utility model provides a compression spring reset type aerial shears. By designing a bent compression spring positioning rod, on the one hand, the vertical distance between the compression spring and the rotation fulcrum is reduced, and on the other hand, the force direction of the compression spring is ensured to be always consistent, which greatly extends the service life of the compression spring and solves the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides a compression spring reset high-altitude shears, comprising a fixed blade, a movable blade, and a center screw and a matching nut connecting the fixed blade and the movable blade; the fixed blade is integrally extended with a fixed blade arm; the movable blade is integrally extended with a movable blade arm; the fixed blade arm is connected to a handle; a movable blade positioning rivet is provided on the surface of the fixed blade arm, close to the side of the movable blade; it is characterized in that a fixing seat is provided on the side of the end of the handle; a rope traction mechanism is provided at the free end of the fixing seat and the movable blade arm; a compression spring positioning rod is connected between the movable blade arm and the fixing seat; the compression spring positioning rod is a bent metal rod, which is bent toward the center screw; the compression spring positioning rod between the bending point and the fixing seat is parallel to the length direction of the handle, and a compression spring clamping block is provided in the middle; the compression spring is sleeved on the outside of the compression spring positioning rod between the compression spring clamping block and the fixing seat.

[0005] Furthermore, the bending angle of the bent metal rod is set based on the principle that the distance between the bending point and the center screw is minimized.

[0006] Furthermore, a saw blade mounting hole is provided on the edge of the fixed blade arm.

[0007] Furthermore, a weight-reducing through hole is provided on the blade arm of the fixed blade.

[0008] Furthermore, the rope pulling mechanism includes a first fixed pulley arranged in the fixed seat, a hook to which the free end of the movable blade arm is suspended, and a second fixed pulley fixedly connected in the hook; a rope threading hole is opened at the bottom of the hook.

[0009] Furthermore, the tail portion to the end of the movable blade arm is bent toward the first fixed pulley.

[0010] Furthermore, the first fixed pulley is connected to the fixing seat through a hollow rivet.

[0011] Furthermore, the second fixed pulley is a deep groove ball bearing pulley.

[0012] Furthermore, the second fixed pulley is connected to the hook via a half-thread screw.

[0013] Compared with the prior art, the above utility model has the following advantages or beneficial effects:

[0014] (1) The utility model designs a bent compression spring positioning rod, which reduces the vertical distance between the compression spring and the rotation fulcrum on the one hand, and ensures that the force direction of the compression spring is always consistent on the other hand, thereby greatly extending the service life of the compression spring, and the elasticity will not be weakened even after 500,000 times of expansion and contraction;

[0015] (2) The reset compression spring structure of the utility model hardly affects the user's sight and is suitable for working conditions with dense tree branches;

[0016] (3) The usage of the utility model is compatible with the usage of traditional high-altitude shears, and is convenient and quick to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn completely to scale, and the emphasis is on illustrating the subject matter of the present invention.

[0018] Figure 1 A rear perspective view of an aerial shears according to an embodiment of the utility model;

[0019] Figure 2 This is a front view of the aerial shears according to one embodiment of the utility model;

[0020] Figure 3 It is a rear view of the aerial shears according to one embodiment of the utility model;

[0021] Figure 4 This is a front view of the aerial shears of one embodiment of the utility model when in use;

[0022] In the attached drawings: 1. fixed blade; 2. movable blade; 3. handle; 4. fixed seat; 6. compression spring positioning rod; 7. compression spring; 8. hook; 9. saw blade mounting hole; 10. traction rope; 14. center screw; 15. nut; 51. first fixed pulley; 52. second fixed pulley; 61. compression spring block; 101. fixed blade arm; 102. weight-reducing through hole; 201. movable blade arm; 202. movable blade positioning rivet; 301. pin; 401. hollow rivet; 801. half-thread screw. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be understood that all of these exemplary embodiments described are only partial embodiments and examples of the present utility model, rather than all of them. On the contrary, these exemplary embodiments are provided so that those skilled in the art can more thoroughly understand the present disclosure and can more completely convey the technical content of the present disclosure to those skilled in the art.

[0024] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; the method can be welding, threaded connection, or binding connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In addition, it should be understood that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0026] Example

[0027] See also Figures 1 to 3The present embodiment provides a compression spring reset type aerial shear, comprising a fixed blade 1, a movable blade 2, and a center screw 14 and a matching nut 15 connecting the fixed blade 1 and the movable blade 2; the fixed blade 1 is integrally extended with a fixed blade arm 101; the movable blade 2 is integrally extended with a movable blade arm 201; the fixed blade arm 101 is connected to a handle 3; a movable blade positioning rivet 202 is provided on the surface of the fixed blade arm 101, near the side of the movable blade 2; it is characterized in that a fixing seat 4 is provided on the side of the end of the handle 3; a pull rope traction mechanism is provided on the free end of the fixing seat 4 and the movable blade arm 201; a compression spring positioning rod 6 is connected between the movable blade arm 201 and the fixing seat 4; the compression spring positioning rod 6 is a bent metal rod, bent toward the center screw 14; the compression spring positioning rod 6 between the bending point and the fixing seat is parallel to the length direction of the handle 3, and a compression spring clamping block 61 is provided in the middle; the compression spring 7 is sleeved on the outer side of the compression spring positioning rod 6 between the compression spring clamping block 61 and the fixing seat 4.

[0028] As a preferred technical solution, further: the bending angle of the bent metal rod is set according to the principle of minimizing the distance between the bending point and the center screw 14. The center screw 14 serves as the rotation fulcrum of the fixed blade 1 and the movable blade 2. The vertical distance between the compression spring positioning rod 6 and the center screw 14 is reduced, so that the compression force on the compression spring is reduced when the blade rotates, which can reduce the deformation of the compression spring.

[0029] As a preferred technical solution, further: the fixed blade arm 101 is fixedly connected to the handle 3 through a pin 301. A saw blade mounting hole 9 is opened on the edge of the fixed blade arm 101 to achieve multifunctionality.

[0030] As a preferred technical solution, further: a weight-reducing through hole 102 is opened on the fixed blade arm 101, so that the dead weight of the aerial shears is reduced and the burden on workers is reduced.

[0031] As a preferred technical solution, further: the rope pulling mechanism includes a first fixed pulley 51 arranged in the fixed seat 4, a hook 8 to which the free end of the movable blade arm 201 is suspended, and a second fixed pulley 52 fixedly connected in the hook 8; a rope threading hole is opened at the bottom of the hook 8. Furthermore, the tail of the movable blade arm 201 is bent toward the first fixed pulley 51 to reduce the force stroke during trimming, thereby saving more effort.

[0032] Preferably, the first fixed pulley 51 is connected to the fixing seat 4 through a hollow rivet 401. The second fixed pulley 52 is a deep groove ball bearing pulley. The second fixed pulley 52 is connected to the hook 8 through a half-thread screw 801.

[0033] The method of using the high-altitude shears is as follows: Figure 4The knotted traction rope 10 passes through the rope threading hole, the first fixed pulley 51 and the second fixed pulley 52 in sequence as the pruning force end; the worker can operate it standing on the open ground or climbing on the tree, holding the handle 3 or the extension rod of the handle with one hand, and pulling the traction rope 10 with the other hand to pull the movable blade arm 201 and the movable blade 2 to rotate, and the compression spring 7 is compressed along the compression spring positioning rod 6, so as to prune the branches. After the traction rope is released, the compression spring 7 returns to its original state and drives the movable blade 2 to reset.

[0034] From the above description, it can be seen that the aerial shears use the bent compression spring positioning rod to reduce the vertical distance between the compression spring and the rotating fulcrum on the one hand, and to ensure that the force direction of the compression spring is always consistent on the other hand, thereby greatly extending the service life of the compression spring. The elasticity of the compression spring will not be weakened even after 500,000 times of expansion and contraction. Moreover, its reset compression spring structure will hardly affect the user's line of sight, and is suitable for working conditions with dense tree branches. Its usage is compatible with traditional aerial shears, and is quick and easy to use.

[0035] The standard parts (such as pins, screws, nuts, pulleys, etc.) used in this application document can be purchased directly from the market, and the non-standard structural components recorded in the specification can also be directly processed according to existing technical common sense without any doubt.

[0036] In summary, the utility model provides a compression spring reset type aerial shears, including a fixed blade, a movable blade, and a center screw and a matching nut connecting the fixed blade and the movable blade; the fixed blade arm is connected to a handle; a fixed seat is provided on the side of the end of the handle; a pull rope traction mechanism is provided at the fixed seat and the free end of the movable blade arm; a compression spring positioning rod is connected between the movable blade arm and the fixed seat; the compression spring positioning rod is a bent metal rod, bent toward the center screw; the compression spring positioning rod between the bending point and the fixed seat is parallel to the length direction of the handle, and a compression spring clamping block is provided in the middle; the compression spring is sleeved on the outside of the compression spring positioning rod between the compression spring clamping block and the fixed seat. The utility model reduces the vertical distance between the compression spring and the rotating fulcrum on the one hand, and ensures that the force direction of the compression spring is always consistent on the other hand, which greatly prolongs the service life of the compression spring.

[0037] The above describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the utility model without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A compression spring reset type aerial shears, comprising a fixed blade (1), a movable blade (2), and a center screw (14) and a matching nut (15) connecting the fixed blade (1) and the movable blade (2); the fixed blade (1) is integrally extended with a fixed blade arm (101); the movable blade (2) is integrally extended with a movable blade arm (201); the fixed blade arm (101) is connected to a handle (3); a movable blade positioning rivet (202) is provided on the surface of the fixed blade arm (101) near the side of the movable blade (2); characterized in that: A fixing seat (4) is provided on the side of the end of the handle (3); a pull rope traction mechanism is provided at the free end of the fixing seat (4) and the movable blade arm (201); a compression spring positioning rod (6) is connected between the movable blade arm (201) and the fixing seat (4); the compression spring positioning rod (6) is a bent metal rod, which is bent toward the center screw (14); the compression spring positioning rod (6) between the bending point and the fixing seat (4) is parallel to the length direction of the handle (3), and a compression spring clamping block (61) is provided in the middle; the compression spring (7) is sleeved on the outer side of the compression spring positioning rod (6) between the compression spring clamping block (61) and the fixing seat (4).

2. A compression spring reset type aerial shear according to claim 1, characterized in that: The bending angle of the bent metal rod is set based on the principle that the distance between the bending point and the center screw (14) is minimized.

3. A compression spring reset type aerial shears according to claim 1, characterized in that: The edge of the fixed blade arm (101) is provided with a saw blade mounting hole (9).

4. A compression spring reset type aerial shears according to claim 1, characterized in that: The fixed blade arm (101) is provided with a weight-reducing through hole (102).

5. A compression spring reset type aerial shears according to any one of claims 1 to 4, characterized in that: The rope pulling mechanism comprises a first fixed pulley (51) arranged in the fixed seat (4), a hook (8) connected to the free end of the movable blade arm (201) by suspension, and a second fixed pulley (52) fixedly connected in the hook (8); a rope threading hole is opened at the bottom of the hook (8).

6. A compression spring reset type aerial shears according to claim 5, characterized in that: The tail portion to the end of the movable blade arm (201) is bent toward the first fixed pulley (51).

7. The compression spring reset type aerial shears according to claim 5, characterized in that: The first fixed pulley (51) is connected to the fixing seat (4) via a hollow rivet (401).

8. The compression spring reset type aerial shears according to claim 5, characterized in that: The second fixed pulley (52) is a deep groove ball bearing pulley.

9. A compression spring reset type aerial shears according to claim 8, characterized in that: The second fixed pulley (52) is connected to the hook (8) via a half-thread screw (801).

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