Movable claw type broken screw tap extractor

Abstract

The movable claw type broken screw tap extractor comprises a clamping part and at least two movable claws, at least two insertion holes with the same opening direction are formed in the clamping part in the circumferential direction at intervals, the movable claws are correspondingly inserted into the insertion holes, and the ends of the movable claws extend out of the insertion holes. Compared with a traditional fixed claw type broken screw tap extractor, the length of the extending part of the movable claw of the movable claw type broken screw tap extractor can be adjusted at will, so that effective contact between the movable claw and a broken screw tap is guaranteed; even if the movable claw is broken due to various reasons, the length of the part, extending out of the inserting hole, of the movable claw can be increased through readjustment, so that the movable claw can be continuously used, and high usability is achieved; the movable claw of the movable claw type broken screw tap extractor is of a long-strip-shaped structure, the position where the cross section changes suddenly does not exist, and therefore stress concentration is avoided, and the movable claw is high in durability and not prone to being broken. In addition, the whole device is simple in structure, simple in manufacturing process and low in production cost.

Description

Technical Field

[0001] The present application relates to the technical field of broken tap extractors, and in particular to a movable claw type broken tap extractor. Background Art

[0002] Taps are relatively widely used in the manufacturing industry and are used to tap threads on workpieces.

[0003] During the tapping process, taps often break in the hole due to unexpected reasons such as tap wear and improper tapping operation. Currently, a broken tap extractor is usually used to remove the broken taps. Common broken tap extractors, such as the one disclosed in patent publication No. CN203485139U, have the same structure and include a body. One end of the body is provided with a clamping portion for engaging with the broken tap in the hole; the other end is provided with a handle for clamping the tool to drive the entire broken tap extractor to rotate. Although this type of broken tap extractor has certain positive significance, the clamping portion in this type of broken tap extractor is usually a plurality of spaced apart fingers, which are usually integrated with the body. During actual use, the driving force from rotating the handle is transmitted to the fingers through the body, thereby driving the broken tap to rotate. During this process, the connection between the fingers and the end face of the body is easily broken due to stress concentration, causing the fingers to be stuck in the broken tap. Moreover, the broken broken tap extractor will be scrapped, resulting in extremely low utilization efficiency. Utility Model Content

[0004] The purpose of this application is to provide a movable claw type broken tap extractor to solve the above problems.

[0005] To achieve the above objectives, the technical solution of this application is:

[0006] A movable claw type broken tap extractor comprises a clamping portion and at least two movable claws. The clamping portion is provided with at least two insertion holes with the same opening direction at intervals in the circumferential direction. The movable claws are correspondingly inserted into the insertion holes, and the ends of the movable claws extend out of the insertion holes.

[0007] Preferably, the plug hole passes through the clamping portion.

[0008] Preferably, the number of the plug holes is three.

[0009] Preferably, the number of the plug holes is four.

[0010] Preferably, the outer wall of the clamping portion is provided with a clamping plane.

[0011] Preferably, the number of the clamping planes is six, and the six clamping planes are arranged circumferentially on the outer wall of the clamping portion.

[0012] Preferably, the cross section of the movable claw includes a first arc segment and a second arc segment, and two ends of the first arc segment are correspondingly connected to two ends of the second arc segment.

[0013] Preferably, it further comprises a rubber ring, which is sleeved on the outside of the plurality of movable claws.

[0014] The present application discloses a movable-claw broken tap extractor. Compared with conventional fixed-claw broken tap extractors, the length of the extended portion of the movable claw of the movable-claw broken tap extractor can be arbitrarily adjusted to ensure effective contact between the movable claw and the broken tap. Even if the movable claw breaks due to various reasons, the length of the movable claw extending from the plug-in hole can be readjusted to increase so that the extractor can continue to be used, thereby having high usability. The movable claw of the movable-claw broken tap extractor has an elongated structure and does not have any cross-sectional abrupt changes, thereby avoiding stress concentration. Therefore, the movable claw is highly durable and not prone to breakage. In addition, the entire device has a simple structure, a streamlined manufacturing process, and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of this application;

[0016] Figure 2 This is an exploded view of the overall structure of this application;

[0017] Figure 3 This is a side view of the overall structure of this application;

[0018] Figure 4 This is a top view of the overall structure of this application;

[0019] Figure 5 This is a schematic diagram of the states of the movable claws of this application when they are extended to different lengths;

[0020] Figure 6 This is a schematic diagram of the end surface structure of the movable claw in this application;

[0021] Figure 7 This is a schematic diagram of the overall structure including the rubber ring in this application.

[0022] In the picture:

[0023] 1. Clamping part; 10. Insertion hole; 11. Clamping plane; 2. Movable claw; 20. First arc segment; 21. Second arc segment; 3. Rubber ring. DETAILED DESCRIPTION

[0024] The present application will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present application in a schematic manner, and therefore only show the components related to the present application.

[0025] like Figure 1-6As shown, a movable claw type broken tap extractor includes a clamping part 1 and at least two movable claws 2. The clamping part 1 is provided with at least two insertion holes 10 with the same opening direction at circumferential intervals. The movable claws 2 are correspondingly inserted into the insertion holes 10, and the ends of the movable claws 2 extend out of the insertion holes 10.

[0026] The clamping portion 1 is used to be clamped by a tool, such as pliers, a wrench, etc.

[0027] The cross-sectional profile of the movable claw 2 should be based on the area enclosed by the gap on the tap and the hole wall, and preferably fits exactly to avoid shaking during rotation.

[0028] The plug-in hole 10 is preferably a straight hole to ensure normal plugging of the movable claw 2 .

[0029] The number of the connecting holes 10 and the movable claws 2 is at least two. The two movable claws 2 can better rotate the broken tap. In some other embodiments, the two connecting holes 10 are evenly spaced 180° circumferentially to ensure that the rotation center is concentric with the rotation center of the broken tap.

[0030] The fit between the movable claw 2 and the plug hole 10 is preferably a transition fit. The movable claw 2 can move axially in the plug hole 10 under the action of external force, but cannot fall off freely from the plug hole 10 under the influence of gravity in a natural state to avoid interference with the use process.

[0031] When the tap extractor is in use, the movable claw 2 is correspondingly inserted into the area formed by the tap gap and the inner wall of the hole, and then the clamping part 1 is rotated, and the clamping part 1 drives the movable claw 2 to rotate, thereby screwing out the broken tap.

[0032] Compared with conventional broken tap extractors, the length of the movable claw 2 of the present movable-claw tap extractor is adjustable, i.e., the portion of the movable claw 2 located outside the insertion hole 10 is longer, so that the movable claw 2 can be inserted deeper into the broken tap. This ensures a larger force-bearing area during rotation, thereby ensuring the contact strength between the movable claw 2 and the broken tap. On the other hand, it also reduces the probability of rotation failure or damage to one of the components due to the shallow contact depth between the two.

[0033] Moreover, when the movable claw 2 extends out of the plug-in hole 10 for a long length, the movable claw 2 will tilt slightly when subjected to radial force, thereby alleviating the stress intensity generated at the "root" of the movable claw 2 (that is, the boundary between the inside and outside of the plug-in hole 10 where the movable claw 2 is located) to a certain extent, thereby reducing the risk of the movable claw 2 breaking.

[0034] It is conceivable that if the movable claw 2 breaks in a broken tap due to an erroneous operation, the length of the movable claw 2 can be readjusted so that the length extending out of the plug-in hole 10 becomes longer, so that the movable claw 2 can continue to be used, which has a higher availability.

[0035] In addition, the movable-claw tap extractor is formed by assembling two parts, and the processing of any single part is very simple without complicated process steps, thereby greatly improving production efficiency and reducing production costs.

[0036] In actual practice, the fracture of a tap does not always form a plane parallel to the cross-section. Some taps will form an inclined cross-section after fracture, and this inclined cross-section will cause the effective depth of the area formed by each gap in the tap and the inner wall of the hole to be different. For traditional broken tap extractors that cannot be adjusted, some areas formed by the gaps between the taps and the inner wall of the circular hole will not be able to be inserted by the plug-in end of the traditional broken tap extractor. However, for the movable claw type broken tap extractor provided in the present application, the extended length of the movable claw 2 can be adjusted accordingly to ensure the effective insertion depth of the area formed by the gap between the tap and the inner wall of the hole.

[0037] In some further embodiments, the insertion hole 10 passes through the clamping portion 1 .

[0038] The plug hole 10 passes through the clamping part 1, that is, the plug hole 10 is a through hole, so both ends of the movable claw 2 can extend out of the plug hole 10, which is more convenient during use and there is no need to deliberately select the end that can work effectively.

[0039] The through-hole 10 also facilitates adjustment of the length of the movable claw 2 extending out of the hole 10 .

[0040] In some further embodiments, the number of the plug holes 10 is preferably three.

[0041] In some other embodiments, the number of the plug holes 10 is four.

[0042] The number of the insertion holes 10 can be determined according to the number of gaps in a standard tap.

[0043] In some further embodiments, a clamping plane 11 is provided on the outer wall of the clamping portion 1 .

[0044] The clamping planes 11 are used for clamping tools to facilitate the rotation of the clamping portion 1. The clamping planes 11 are preferably an even number, and two opposite clamping planes 11 are parallel to each other to facilitate the clamping of tools.

[0045] In some further embodiments, the number of the clamping planes 11 is six, and the six clamping planes 11 are arranged circumferentially on the outer wall of the clamping portion 1 .

[0046] Exemplarily, the clamping portion 1 is preferably a prism structure, the plug hole 10 passes through the two end faces of the prism, and the clamping plane 11 is set as the side wall of the prism, and is further preferably a hexagonal prism.

[0047] In some further embodiments, the cross section of the movable claw 2 includes a first arc segment 20 and a second arc segment 21 , and two ends of the first arc segment 20 are correspondingly connected to two ends of the second arc segment 21 .

[0048] The movable claws 2 have two side walls, both of which are arc surfaces. When multiple circumferentially spaced movable claws 2 are inserted into the insertion holes 10, the arc surfaces relatively located on the outside of the movable claws 2 are located on the same circumference to fit together with the inner wall of the hole.

[0049] The arc surface corresponding to the first arc segment 20 is a relatively outer arc surface, and the arc surface corresponding to the second arc segment 21 is a relatively inner arc surface.

[0050] like Figure 7 As shown, in some further embodiments, a rubber ring 3 is further included, and the rubber ring 3 is sleeved on the outside of the movable claws 2.

[0051] In order to prevent the movable claw 2 from moving, in some other embodiments, a rubber ring 3 is commonly provided on the outside of all the movable claws 2. The rubber ring 3 is clamped on the outside of the movable claw 2 to limit the movement of the movable claw 2 to ensure stability during the plugging process.

[0052] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A movable claw type broken tap extractor, characterized in that: The invention comprises a clamping portion (1) and at least two movable claws (2), wherein at least two plug holes (10) with the same opening direction are provided at intervals on the circumferential direction of the clamping portion (1), and the movable claws (2) are correspondingly plugged into the plug holes (10), with the ends of the movable claws (2) extending outside the plug holes (10).

2. The movable claw type broken tap extractor according to claim 1, characterized in that: The plug-in hole (10) passes through the clamping portion (1).

3. The movable claw type broken tap extractor according to claim 1 or 2, characterized in that: The number of the plug holes (10) is three.

4. The movable claw type broken tap extractor according to claim 1 or 2, characterized in that: The number of the plug holes (10) is four.

5. The movable claw type broken tap extractor according to claim 1, characterized in that: The outer wall of the clamping portion (1) is provided with a clamping plane (11).

6. The movable claw type broken tap extractor according to claim 5, characterized in that: The number of the clamping planes (11) is six, and the six clamping planes (11) are arranged circumferentially on the outer wall of the clamping portion (1).

7. The movable claw type broken tap extractor according to claim 1, characterized in that: The cross section of the movable claw (2) comprises a first arc segment (20) and a second arc segment (21), and two ends of the first arc segment (20) are respectively connected to two ends of the second arc segment (21).

8. The movable claw type broken tap extractor according to claim 1, characterized in that: It also includes a rubber ring (3), which is sleeved on the outside of the plurality of movable claws (2).

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