flat key take-up spanner

Abstract

This utility model belongs to the technical field of mechanical equipment repair tools, and in particular is a key-removing pliers for flat keys. It includes a fixed handle, a fixed connecting rod, a support, a movable handle, a movable pull rod, a nut, a movable top seat, a movable connecting rod, and movable jaws. The fixed handle has a fixed connecting rod integrally connected to both the left and right sides of its front end, and a through groove is formed inside the rear section of the fixed handle. A support is integrally connected to the upper left and right sides of the front section of the fixed handle, and a movable handle is located at the upper end of the support. A movable pull rod is movably connected to the rear end of the movable handle via a pin, and the bottom section of the movable pull rod passes through the through groove and is screwed onto a nut. A movable top seat is located at the upper front end of the fixed handle, and movable connecting rods are movably connected to the middle positions of both left and right sides of the movable top seat via pins. This utility model has a simple structural design, utilizes the lever principle, is easy to operate, saves effort and is convenient, and causes minimal damage to the flat key and shaft, without affecting its subsequent use.

Description

Technical Field

[0001] This utility model belongs to the technical field of mechanical equipment repair tools, specifically relating to flat key removal pliers. Background Technology

[0002] A flat key is a standard part widely used in mechanical transmission in the machinery industry. Its core function is to transmit torque through the compression between the key and the side of the keyway, while realizing a detachable connection between the shaft and the transmission component.

[0003] Most flat keys are assembled with the keyways on the shaft using an interference fit, and the flat keys do not have set screw holes. When equipment malfunctions, common solutions for these flat keys without set screw holes include using a hammer with a flat chisel or a hammering screwdriver to knock the flat key out of the keyway; or using an electric drill to drill and tap the stuck flat key, and then using a pin puller to pull it out of the keyway. If these methods of removing the flat key from the keyway are not handled properly, they can easily cause significant damage to the flat key and the shaft, affecting the overall strength of the flat key and leaving potential safety hazards for the equipment after reassembly. In addition, the difficulty in disassembling the flat key also leads to extended maintenance time, seriously affecting the production efficiency of the factory.

[0004] Based on the above, this utility model proposes a key-removing pliers for disassembling flat keys without set screw holes. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a key-removing pliers with a simple structure design. Utilizing the lever principle, it is easy to operate, labor-saving, and convenient, and causes minimal damage to the key and shaft, without affecting its subsequent use.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a key-removing pliers, comprising a fixed handle, a fixed connecting rod, a support, a movable handle, a movable pull rod, a nut, a movable top seat, a movable connecting rod, and a movable chuck; The front left and right sides of the fixed handle are integrally connected with fixed connecting rods, and the rear section of the fixed handle has a through groove. The upper left and right sides of the front section of the fixed handle are integrally connected to the support. The upper end of the support is provided with a movable handle. The front section of the movable handle is movably connected to the support by a pin. The rear end of the movable handle is movably connected to a movable pull rod by a pin. The bottom section of the movable pull rod passes through a through groove and is screwed with a nut. The upper front end of the fixed handle is provided with a movable top seat. The middle positions of the left and right sides of the movable top seat are movably connected to movable connecting rods by pins. The bottom ends of the movable connecting rods are movably connected to movable claws by pins on both the front and rear sides. The bottom ends of the movable claws are movably connected to the fixed connecting rods by pins.

[0007] As a preferred technical solution of the flat key-removing pliers of this utility model, the upper front part of the movable handle is inclined upward.

[0008] As a preferred technical solution for the flat key picking pliers of this utility model, the bottom section of the movable pull rod has threads integrally formed around its outer wall.

[0009] As a preferred technical solution for the flat key removal pliers of this utility model, the nut is butterfly-shaped.

[0010] As a preferred technical solution for the flat key picking clamp of this utility model, the movable top seat has an "H" shaped structure.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This utility model mainly consists of a fixed handle, a fixed connecting rod, a support, a movable handle, a movable pull rod, a nut, a movable top seat, a movable connecting rod, and a movable pawl. Its structural design is simple, mainly using a two-stage lever method to clamp the flat key. Then, the nut on the movable pull rod is used to lock the lever structure. Finally, an upward force is applied to the end of the fixed handle, using the lever principle to pull the flat key out of the keyway. The operation is simple, labor-saving, and convenient, and causes minimal damage to the flat key and shaft, without affecting its subsequent use. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial sectional view of the structure of this utility model from the side. Figure 3 This is a partial cross-sectional three-dimensional structural diagram of the present invention.

[0013] In the diagram: 1. Fixed handle; 2. Fixed connecting rod; 3. Through groove; 4. Support; 5. Movable handle; 6. Movable pull rod; 7. Nut; 8. Movable top seat; 9. Movable connecting rod; 10. Movable pawl; 11. Flat key. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0015] Please see Figure 1-3 The present invention provides the following technical solution: a key-removing pliers, comprising a fixed handle 1, a fixed connecting rod 2, a support 4, a movable handle 5, a movable pull rod 6, a nut 7, a movable top seat 8, a movable connecting rod 9, and a movable chuck 10; Reference Figure 1 , Figure 2 and Figure 3 As shown, furthermore, the front left and right sides of the fixed handle 1 are integrally connected with fixed connecting rods 2, and the rear section of the fixed handle 1 is provided with a through groove 3. The through groove 3 has a large opening to facilitate the insertion and movement of the movable pull rod 6. Reference Figure 1 , Figure 2 and Figure 3 As shown, further, the upper left and right sides of the front section of the fixed handle 1 are integrally connected to the support 4. The upper end of the support 4 is provided with a movable handle 5. The front section of the movable handle 5 is movably connected to the support 4 by a pin. The upper front end of the movable handle 5 is inclined upward, which can pry the upper movable top seat 8 upward, thereby further tightening the movable connecting rod 9 and tightening the movable claw 10. The rear end of the movable handle 5 is movably connected to the movable pull rod 6 by a pin. The bottom section of the movable pull rod 6 has threads integrally formed around its outer wall. The bottom section of the movable pull rod 6 passes through the through groove 3 and is screwed with a nut 7. The nut 7 is butterfly-shaped. Reference Figure 1 , Figure 2 and Figure 3 As shown, further, a movable top seat 8 is provided at the upper front end of the fixed handle 1. The movable top seat 8 has an "H" shaped structure. Movable connecting rods 9 are movably connected to the middle positions of the left and right sides of the movable top seat 8 by pins. Movable claws 10 are movably connected to the front and rear sides of the bottom end of the movable connecting rod 9 by pins. The bottom end of the movable claws 10 is movably connected to the fixed connecting rod 2 by pins. Under the upward lifting force of the front of the movable handle 5, the movable top seat 8 and the movable connecting rod 9 can move upward, thereby further driving the movable claws 10 to tighten, so as to firmly clamp the flat key 11. There are four movable claws 10 in total, in pairs. The two movable claws 10 in a pair are respectively located on the front and rear sides of the bottom of the movable connecting rod 9. The four claws clamp the key, and the clamping is stable and firm.

[0016] In this embodiment: This utility model mainly consists of a fixed handle 1, a fixed connecting rod 2, a support 4, a movable handle 5, a movable pull rod 6, a nut 7, a movable top seat 8, a movable connecting rod 9, and a movable pawl 10. Its structural design is simple, mainly using a two-stage lever method to clamp the flat key 11. Then, the nut 7 on the movable pull rod 6 is used to lock the lever structure. Finally, an upward force is applied to the end of the fixed handle 1, using the lever principle to pull the flat key 11 out of the keyway. The operation is simple, labor-saving, and convenient, and causes minimal damage to the flat key 11 and the shaft, without affecting its subsequent use.

[0017] The usage process and working principle of this utility model are as follows: In use, the movable claw 10 is used to lock the two sides of the protruding part of the flat key 11 on the shaft. Then, the nut 7 on the movable pull rod 6 is tightened upwards, so that the movable handle 5 is pulled downwards by the movable pull rod 6. At the same time, the front end of the movable pull rod 6 is tilted upwards, which applies an upward force to the movable top seat 8, the movable connecting rod 9 and the movable claw 10, which can drive the movable claw 10 to tighten further inwards, so as to firmly clamp the flat key 11. Finally, an upward force is applied to the end of the fixed handle 1. Using the principle of leverage, the flat key 11 can be pulled out from the keyway on the shaft. The movable claw 10 is a first-level force-saving lever, and the movable handle 5 is a second-level force-saving lever, which makes the operation labor-saving and convenient.

[0018] In addition, all content not described in detail in this embodiment falls within the scope of existing technology and common knowledge.

[0019] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flat key taking key pliers, characterized in that: It includes a fixed handle (1), a fixed connecting rod (2), a support (4), a movable handle (5), a movable pull rod (6), a nut (7), a movable top seat (8), a movable connecting rod (9), and a movable pawl (10); The front end of the fixed handle (1) is integrally connected to the left and right sides with a fixed connecting rod (2), and the rear section of the fixed handle (1) is provided with a through groove (3). The upper left and right sides of the front section of the fixed handle (1) are integrally connected with a support (4). The upper end of the support (4) is provided with a movable handle (5). The front section of the movable handle (5) is movably connected to the support (4) by a pin. The rear end of the movable handle (5) is movably connected to a movable pull rod (6) by a pin. The bottom section of the movable pull rod (6) passes through the through groove (3) and is screwed with a nut (7). The fixed handle (1) has a movable top seat (8) at the upper front end. The movable top seat (8) has movable connecting rods (9) connected to the middle of the left and right sides by pins. The movable connecting rods (9) have movable claws (10) connected to the front and rear sides of the bottom end by pins. The bottom end of the movable claws (10) is connected to the fixed connecting rod (2) by pins.

2. The flat key extractor of claim 1, wherein: The upper front end of the active handle (5) is tilted upwards.

3. The key-removing pliers according to claim 1, characterized in that: The bottom section of the movable pull rod (6) has an integrally formed thread around its outer wall.

4. The flat key extractor of claim 1, wherein: The nut (7) is butterfly-shaped.

5. The flat key extractor of claim 1, wherein: The movable top seat (8) has an "H" shaped structure.

Images