Bit clamping mechanism in test pencil

Abstract

The utility model provides a bit clamping mechanism in a test pencil. The clamping mechanism comprises a positioning groove arranged in the test pencil and a clamping piece embedded in the positioning groove. The two side walls corresponding to the positioning groove are each provided with a receding opening. The two sides of the clamping piece are provided with clamping plates formed by bending, the two clamping plates protrude towards the middle of the clamping piece to form limiting parts, and the positions, provided with the limiting parts, of the two clamping plates are opposite to the two receding openings respectively. When the screwdriver head is inserted, the limiting parts of the clamping plates are pushed to enable the clamping plates to be bent and deformed in the receding openings to pre-store elastic potential energy, the clamping plates are rapidly reset by means of the pre-stored elastic potential energy after the screwdriver head is inserted into the clamping grooves in place, the limiting parts of the two clamping plates are accurately embedded into the clamping grooves to complete clamping and locking of the screwdriver head, and therefore the screwdriver head is fixed to the test pencil. Therefore, through the cooperation of the clamping piece and the positioning groove, the quick clamping of the screwdriver head in a plug-and-play mode is achieved, the operation steps are obviously simplified, and the use convenience of an electrician tool is improved.

Description

Technical Field

[0001] This utility model relates to the field of test pen structure, and in particular to a bit clamping mechanism in a test pen. Background Technology

[0002] To enhance the practicality of test pens, the bits are often replaceable, allowing for easy switching between different tips (e.g., flathead or Phillips head) to meet operational needs. Currently, most test pens on the market use threaded tightening or friction locking mechanisms for bit clamping. These mechanisms have significant drawbacks in practical use: threaded tightening requires multiple rotations, resulting in low clamping efficiency and a tendency for loosening due to thread wear; while simple friction locking, due to uneven pressure distribution on the contact surface, struggles to maintain stable clamping under complex working conditions. Therefore, a solution that balances quick clamping with stable locking is urgently needed. Utility Model Content

[0003] To address the shortcomings mentioned above in the background technology, this utility model provides a bit clamping mechanism for a test pen.

[0004] The present invention adopts the following technical solution:

[0005] A bit clamping mechanism for a test pen, the clamping mechanism comprising:

[0006] A positioning groove is provided inside the test pen, and clearance openings are provided on both sides of the positioning groove;

[0007] A clamping member is embedded in the positioning groove, and clamping plates on both sides of the clamping member, both clamping plates protruding towards the middle of the clamping member to form a limiting part;

[0008] The two clamping plates are positioned with the limiting parts corresponding to the two clearance openings. When the bit is inserted into the end hole of the test pen, the cutting head at the end of the bit pushes the two clamping plates open to the two clearance openings. After the slot on the bit's annular surface corresponds to the two limiting parts, the clamping plates elastically reset so that the two limiting parts are respectively embedded in the two sides of the slot.

[0009] In one possible implementation, the ends of both clamping plates are bent outwards from the clamping member and towards the other end of the clamping member, so that the ends of the clamping plates form an arc transition, and the bit is inserted into the clamping member along the arc transition between the two clamping plates.

[0010] In one possible implementation, the ends of the clamping plates are bent outwards from the clamping member and towards the end of the clamping member that is away from the bit insertion point to form a bent section. The test pen has a blocking part fixed on the side outside the two relief openings. When the cutting head at the end of the bit pushes the two clamping plates open to the two relief openings respectively, the two bent sections push against the two blocking parts respectively, causing the bent sections to be squeezed by the blocking parts and produce elastic deformation.

[0011] In one possible implementation, the surfaces of the limiting portion facing both ends of the clamping member are isosceles inclined planes.

[0012] In one possible implementation, a circuit board is fixed inside the test pen, the input electrode of the circuit board extends to the positioning groove, and the clamping member has an outwardly bent contact plate on the end away from the insertion of the bit between the two clamping plates. When the circuit board is fixed inside the test pen, the input electrode presses the contact plate into the positioning groove.

[0013] As can be seen from the above description of the structure of this utility model, compared with the prior art, this utility model has the following advantages: This utility model achieves quick assembly and disassembly of the bit through the cooperation of the U-shaped clamping member and the positioning groove. When the bit is inserted, the limiting part of the clamping plate is pushed, causing the clamping plate to bend and deform in the clearance opening to store elastic potential energy. When the bit is inserted into the slot, the clamping plate quickly resets with the help of the stored elastic potential energy, so that the limiting parts of the two clamping plates are accurately embedded into the slot to complete the clamping and locking of the bit, thereby fixing the bit in the test pen. It achieves quick clamping with "plug and play", significantly simplifies the operation steps, and helps to improve the ease of use of electrical tools. Attached Figure Description

[0014] Figure 1 A three-dimensional structural diagram of the voltage tester of this utility model is provided.

[0015] Figure 2 for Figure 1 A schematic diagram showing the hidden upper casing of the test pen.

[0016] Figure 3 This is a schematic diagram of the structure of a test pen inserted into one end of a screwdriver bit.

[0017] Figure 4 This is a three-dimensional structural diagram of the clamping component.

[0018] Figure 5 This is a schematic diagram of the three-dimensional structure of the bit.

[0019] Figure 6 for Figure 1 A cross-sectional view along the AA direction.

[0020] Figure 7 for Figure 6A magnified diagram of point C.

[0021] Figure 8 for Figure 1 A cross-sectional view along the BB direction. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0023] In this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0024] This utility model provides a bit clamping mechanism for a test pen, as shown in the attached figure. Figures 1 to 3 As shown, the clamping mechanism includes a positioning groove 101 disposed within the test pen 1 and a clamping member 2 embedded within the positioning groove 101. Both side walls of the positioning groove 101 are provided with clearance openings 102. (See attached diagram.) Figure 4 The clamping member 2 has two bent clamping plates 21 on both sides. Specifically, the clamping member 2 can be a U-shaped sheet metal part formed by bending a copper plate. Both clamping plates 21 protrude towards the middle of the clamping member 2 to form a limiting part 22. The limiting parts 22 of the two clamping plates 21 are respectively positioned at the two clearance openings 102.

[0025] Please refer to the appendix. Figures 5 to 7 When the bit 3 is inserted into the end hole 103 of the test pen 1, the cutting edge at the end of the bit 3 pushes the limiting part 22 of the two clamping plates 21 to push the two clamping plates 21 open to the two relief openings 102 respectively. This causes the clamping plates 21 to undergo directional bending deformation due to the position constraint of the side wall of the relief opening 102. After the groove 301 of the bit 3 near the cutting edge position corresponds to the two limiting parts 22, the limiting parts 22 lose their obstruction. The clamping plates 21 are driven to quickly return to their original position by the kinetic energy released by the deformation, so that the limiting parts 22 are instantly embedded in the groove 301, thereby realizing the clamping and fixing of the bit 3. Furthermore, the surfaces of the limiting parts 22 facing both ends of the clamping member 2 are isosceles inclined planes. Specifically, the limiting parts 22 can be conical protrusions formed by the inward stamping of the bent section 23. The isosceles inclined structure of the limiting part 22 can guide the process of the limiting groove being inserted into the slot 301 and pulled out of the slot 301 when the bit 3 is inserted or pulled out, thereby improving the convenience of disassembling and assembling the bit 3 and realizing the rapid disassembly and assembly of the bit 3.

[0026] It is worth mentioning that during the disassembly of the bit, when the bit 3 is pulled outward, the side wall of the slot 301 contacts the limiting part 22 and generates a lateral thrust. This thrust causes the two clamping plates 21 to undergo directional elastic deformation along the side wall of the relief opening, resulting in a gradual increase in the distance between the two limiting parts 22. When the distance exceeds the outer diameter of the bit 3, the elastic potential energy generated by the deformation of the clamping plate 21 is completely released. At this time, the constraint of the clamping member 2 is released, and the bit 3 can smoothly disengage from the clamping mechanism. During this action, the coordinated deformation mechanism of the clamping plate 21 and the relief opening 102 effectively reduces the disassembly resistance and achieves rapid separation of the bit 3 from the clamping mechanism.

[0027] In addition, most of the wholesale parts sold in the market are packaged with... Figure 5 The hexagonal prism structure shown has two limiting parts 22 embedded on both sides of the bit 3, which can press against the corresponding planes of the bit 3 to prevent the bit 3 from rotating radially. Further, refer to the attached... Figure 3 The end hole 103 of the test pen is a regular hexagonal through hole, which matches the hexagonal prism size of the bit 3, so that after the bit 3 is inserted along the end hole 103, it can remain radially fixed relative to the test pen 1.

[0028] Continue to refer to the appendix Figure 4 and 6 Both ends of the clamping plates 21 are bent outwards from the clamping member 2 and towards the other end of the clamping member 2 to form a bent section 23, so that the ends of the clamping plates 21 form an arc transition. When the cutting head of the bit 3 is inserted into the clamping member 2 along the arc transition between the two clamping plates 21, this arc transition can form a guiding effect and be guided between the two clamping plates 21, so as to avoid the cutting head hitting the end of the clamping plate 21 and causing the insertion to be obstructed. In addition, the test pen 1 has a blocking part 11 fixed on the side outside the two clearance ports 102. When the cutting head at the end of the bit 3 pushes the two clamping plates 21 open to the two clearance ports 102 respectively, it drives the two bent sections 23 to push against the two blocking parts 11 respectively. The bent sections 23 are squeezed by the blocking parts 11 and generate elastic deformation to store elastic potential energy. After the bit 3 is inserted into the slot 301 and corresponds to the limiting part 22, the elastic reset of the clamping plate 21 and the bent section 23 causes the limiting part 22 to quickly reset to the embedded slot 301. This design, through the synergistic effect of arc-shaped guidance and elastic energy storage release, reduces the insertion resistance of the bit 3 and achieves a rapid reset response, significantly improving the smoothness of tool operation and clamping stability.

[0029] In addition, as attached Figure 2 and 8 As shown, the test pen 1 has a circuit board 4 fixed inside for measuring voltage or current. The input electrode of the circuit board 4 extends to the positioning groove 101. Specifically, the input electrode can be a coated electrode glued to the circuit board 4. (See attached diagram.) Figure 4The clamping member 2 has an outwardly bent contact plate 24 at the end between the two clamping plates 21, away from where the bit 3 is inserted. This bent structure gives the contact plate 24 an elastic reset function relative to the two clamping plates 21. When the clamping member 2 is embedded in the positioning groove 101, the circuit board 4 is fixed into the test pen 1, causing the input electrode to press the contact plate 24 into the positioning groove 101. The elastic deformation of the contact plate 24 itself generates pressure against the circuit board 4, keeping the contact plate 24 and the circuit board in contact. This ensures a stable electrical connection between the clamping member 2 and the input electrode of the circuit board 4, thereby automatically forming the entire conductive path. Circuit testing can be performed without additional wiring, significantly improving operational efficiency. This structure achieves reliable electrical connection between the components through the synergistic effect of mechanical fitting and elastic contact.

[0030] In summary, this utility model achieves rapid assembly and disassembly of the bit 3 through the cooperation of the U-shaped clamping member 2 and the positioning groove 101. When the bit 3 is inserted, the cutting edge at its end pushes the limiting part 22 of the clamping plate 21, forcing the clamping plate 21 to bend and deform in the relief opening 102, thereby pre-storing elastic potential energy. When the bit 3 is inserted into the slot 301, the clamping plate 21 quickly resets with the help of the pre-storing elastic potential energy, so that the limiting parts 22 of the two clamping plates 21 are accurately embedded into the slot 301 to complete the clamping and locking of the bit 3, thereby fixing the bit 3 to the test pen 1. At the same time, the clamping member 2 maintains a stable electrical connection with the circuit board 4 through the contact plate 24, combining mechanical clamping and electrical conduction functions, realizing "plug and play" quick clamping and electrical connection, significantly simplifying the operation steps and improving the ease of use of electrician tools.

[0031] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A tip chucking mechanism in an electrical tester, characterized by comprising: The clamping mechanism comprises: A positioning slot arranged in the test pen, both sides of the positioning slot are provided with a clearance; A clamping piece embedded in the positioning slot, both sides of the clamping piece form clamping plates, both clamping plates are protruded to the middle of the clamping piece to form limiting parts; Wherein, the positions of the limiting parts of both clamping plates are respectively arranged in the clearances, when the bit is inserted along the end hole of the test pen, the bit head of the bit end will open both clamping plates to the clearances respectively, after the clamping slots of the bit ring surface are corresponded to both limiting parts, the clamping plates make both limiting parts respectively embedded in both sides of the clamping slots through elastic reset.

2. The clamping mechanism of claim 1, wherein, Both ends of both clamping plates are bent outwards and to the other end of the clamping piece, so that the ends of the clamping plates form arc transitions, the bit is inserted into the clamping piece along the arc transition between both clamping plates.

3. A clamping mechanism according to claim 1 or 2, wherein Both ends of the clamping plates are bent outwards and to the other end of the clamping piece away from the bit insertion to form bent segments, both sides of the test pen outside the clearances are fixed with blocking parts, when the bit head of the bit end opens both clamping plates to the clearances respectively, both bent segments are respectively pushed to both blocking parts, so that the bent segments are elastically deformed by the extrusion of the blocking parts.

4. The clamping mechanism of claim 1, wherein The surfaces of the limiting parts towards both ends of the clamping piece are isosceles inclined surfaces.

5. The clamping mechanism of claim 1, wherein, A circuit board is fixed in the test pen, an input electrode of the circuit board extends to the positioning slot, the clamping piece is provided with an outwardly bent contact plate on the end away from the bit between both clamping plates, when the circuit board is fixed in the test pen, the input electrode will press the contact plate to the positioning slot.

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