Test pencil convenient to maintain

Abstract

The utility model relates to the technical field of test pencils, in particular to a test pencil convenient to maintain, which comprises an insulating pencil shell, a pencil point in threaded connection with the front end of the insulating pencil shell, a metal tube coaxially arranged in the pencil point, a plurality of limiting holes formed in the outer wall of the metal tube, an electric shock rod clamped in the metal tube, and a limiting block mounted at the tail end of the electric shock rod. And a connecting cylinder is coaxially arranged in the pen point. Compared with the prior art, the mounting shell, the round block, the connecting rod and the pushing assembly are arranged to be matched with one another, the round block and the pushing assembly can be pressed to extrude the limiting block and block the limiting hole when the electric shock rod is maintained, and the technical problem that the electric shock rod can be pulled out only by detaching the pen point and the electroprobe shell and then pressing the limiting hole in sequence is solved; secondly, according to the scheme, the clamping assembly is arranged on the inner wall of the connecting cylinder, when the metal tube is maintained or replaced, the metal tube can be pulled out of the connecting cylinder, and the problem that when the metal tube is damaged, the pen point needs to be replaced, and resources are wasted is solved.

Description

Technical Field

[0001] This utility model relates to the field of test pen technology, specifically a test pen that is easy to repair. Background Technology

[0002] In today's era of widespread electricity use, test pens play an indispensable role as a common electrical testing tool. However, existing test pens present numerous problems in terms of maintenance. Traditional test pens often have a complex structural design with tightly packed internal components. Once a malfunction occurs, maintenance personnel need to spend a significant amount of time and effort to disassemble and reassemble them. This not only increases maintenance costs but may also cause accidental damage to other components during disassembly.

[0003] A patent publication number CN220709249U discloses an electric pen with an extendable probe structure, comprising a pen shell, a pen tip mounted at the front end of the pen shell, a metal spring and a resistor installed inside the pen shell, a hand contact electrode provided at the end of the pen shell, the pen tip being detachably and fixedly connected to the pen shell, a metal tube installed in the middle of the pen tip, the metal tube being fixedly connected to the pen tip, a plurality of limiting holes being opened on the metal tube, and a contact rod being slidably mounted inside the metal tube, the end of the contact rod being provided with a limiting block in the radial direction that cooperates with the limiting holes, the limiting block being slidably connected to the contact rod, and a support spring being installed between the limiting block and the contact rod.

[0004] With the above settings, the existing technology makes the test pen shell and pen tip detachable, which allows for flexible operation when the length needs to be adjusted. At the same time, the sliding fit between the metal tube and the contact rod facilitates the adjustment of the contact rod. Furthermore, the metal tube and the contact rod are interlocked by a pressable ball-head slide rod structure.

[0005] However, the existing extended probe structure of the electronic pen has the following drawbacks during operation:

[0006] (1) When the contact rod of the test pen is damaged and needs to be repaired or replaced, the test pen shell and pen tip need to be disassembled first. The ball head slide needs to be pressed by hand every time it passes through a limit hole. By changing the position of the ball head slide in different limit holes, the length of the contact rod extending out of the metal tube can be changed until the ball head slide passes through the last limit hole. The process is very cumbersome and inconvenient to operate, and needs to be improved.

[0007] (2) Secondly, since the metal tube is fixedly connected to the pen tip, when the metal tube is damaged and needs to be repaired, the metal tube and the pen tip cannot be disassembled from each other. The pen tip and the metal tube can only be replaced together, resulting in a waste of resources. Utility Model Content

[0008] This utility model aims to provide a convenient test pen for repair. It primarily addresses the problem of existing test pens where, when the contact rod is damaged and needs repair or replacement, the pen casing and tip must first be disassembled. Then, the ball-head slide rod must be continuously pressed to change its position in different limit holes, adjusting the length of the contact rod extending from the metal tube until the ball-head slide rod passes through the last limit hole before the contact rod can be pulled out. This process is cumbersome and inconvenient, and needs improvement. Furthermore, because the metal tube is fixedly connected to the pen tip, it cannot be disassembled during repair, requiring the pen tip and metal tube to be replaced together, resulting in resource waste.

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0010] A convenient test pen includes an insulating pen shell, a pen tip threaded to the front end of the insulating pen shell, a metal tube coaxially disposed inside the pen tip, several limiting holes formed on the outer wall of the metal tube, a contact rod snapped into the metal tube, a limiting block installed at the end of the contact rod, a connecting cylinder coaxially disposed inside the pen tip, a support rod fixedly connected to the outer wall of the connecting cylinder, the other end of the support rod fixedly connected to the inner wall of the pen tip, one end of the metal tube passing through the connecting cylinder and extending beyond the end of the pen tip, the other end of the metal tube located inside the insulating pen shell, a snapping assembly for snapping the metal tube provided on the inner wall of the connecting cylinder, a pushing assembly for pushing the limiting block slidably connected to the outer wall of the metal tube, a mounting shell embedded in the inner wall of the insulating pen shell, a clearance hole formed on the upper end face of the mounting shell, a through hole formed on the lower end face of the mounting shell, a connecting rod coaxially disposed inside the mounting shell, a round block fixedly connected to one end of the connecting rod, one end of the round block extending out of the clearance hole, the other end of the connecting rod passing through the through hole and detachably connected to the outer wall of the pushing assembly.

[0011] The working principle and beneficial effects of this utility model:

[0012] 1. Working principle: When the electric shock rod and metal tube need maintenance, press the round block. The round block drives the connecting rod to move downwards. The connecting rod drives the pushing component to move downwards until it squeezes the limiting block out of the limiting hole. (The limiting block will move downwards when squeezed, and the downward movement of the limiting block will squeeze the support spring into the mounting groove). The part in parentheses is prior art and is not described in detail in this application. Pull the front end of the electric shock rod to pull it out. Then rotate the round block. Since the connecting rod and the pushing component are detachably connected, the round block drives the connecting rod to rotate and then disengages from the pushing component. Then disassemble the pen tip and the insulating pen shell. At this time, pull the rear end of the metal tube. When the metal tube moves, it will squeeze the locking component. After the metal tube disengages from the locking component, the metal tube can be completely pulled out for maintenance.

[0013] 2. Beneficial effects:

[0014] (1) Existing technology makes the pen shell and pen tip detachable, which is convenient for flexible operation when the length needs to be adjusted. At the same time, the sliding fit between the metal tube and the contact rod facilitates the adjustment of the contact rod. Moreover, the metal tube and the contact rod are mutually locked by a pressable ball-head slide rod structure. However, when the contact rod is damaged and needs to be repaired or replaced, the pen tip and pen shell must be disassembled first, and then the ball-head slide rod must be continuously pressed until it passes through the last limiting hole before the contact rod can be pulled out of the metal tube. The operation is cumbersome. This solution solves the technical problem that the pen tip and pen shell need to be disassembled and the contact rod needs to be pulled out of the metal tube by hand when it needs to be repaired.

[0015] (2) This solution has a snap-fit ​​component on the inner wall of the connecting tube. When the metal tube needs to be repaired or replaced, the connecting rod and the pushing component are disassembled, and then the pen tip and the insulating pen cap are disassembled. The metal tube can be pulled out of the connecting tube by pulling the rear end of the metal tube. This solves the technical problem that when the metal tube and the pen tip are fixedly connected, the pen tip can only be replaced together when the metal tube is damaged, which causes waste of resources.

[0016] Preferably, the snap-fit ​​assembly includes an installation groove on the inner wall of the connecting cylinder, a spring piece installed on the inner wall of the installation groove, one end of the spring piece being fixedly connected to the inner wall of the installation groove, and the other end of the spring piece being slidably connected inside the installation groove. The outer wall of the metal tube has a snap-fit ​​groove that mates with the spring piece. When maintenance of the metal tube and the contact rod is required, pressing the round block causes the connecting rod and the pushing assembly to move downwards. When the pushing assembly moves downwards to squeeze the limiting block out of the limiting hole, pulling the front end of the contact rod completely extracts it from the metal tube. Pressing and rotating the round block causes the connecting rod to rotate. The device is detachably connected to the push assembly. After the connecting rod rotates, it disengages from the push assembly. Since the pen tip and the insulating pen shell are threaded together, rotating the insulating pen shell disengages it from the pen tip. At this time, pulling the rear end of the metal tube causes the inner wall of the slot to squeeze the spring piece as the metal tube moves. After the spring piece disengages from the slot, the metal tube can be pulled out of the connecting cylinder for maintenance of the electric shock rod or the metal tube. The spring piece can securely hold the metal tube in the connecting cylinder and also facilitates extraction. The push assembly can seal all the limit holes at once, eliminating the need to manually press the limit blocks one by one during the movement of the electric shock rod, thus preventing the limit blocks from getting stuck in the limit holes.

[0017] Preferably, the mounting grooves are multiple and evenly distributed in a circumferential array on the inner wall of the connecting cylinder; multiple mounting grooves are opened on the inner wall of the connecting cylinder and evenly distributed in a circumferential array, and multiple spring clips engage the metal tube, making the metal tube more stable.

[0018] Preferably, the pushing assembly includes an arc-shaped long plate threadedly connected to the end of the connecting rod away from the circular block. The curvature of the arc-shaped long plate matches the outer wall of the metal tube, and a push block matching the limiting hole is fixedly connected to the inner wall of the arc-shaped long plate. When it is necessary to adjust the length of the electric shock rod extending out of the metal tube, the circular block is pressed, which drives the connecting rod to move downward. The downward movement of the connecting rod drives the arc-shaped long plate to move downward, and at the same time, the arc-shaped long plate drives the push block to move downward. When the push block squeezes the limiting block out of the limiting hole, the front end of the electric shock rod is pulled to adjust the electric shock rod to the required position. Then, the pressing of the circular block is stopped, and the limiting block is engaged in the limiting hole at the required position. When it is necessary to repair the electric shock rod, the circular block is pressed again. At this time, the front end of the electric shock rod is pulled to completely pull the electric shock rod out of the metal tube. The operation is convenient, and it is not necessary to disassemble the pen tip and the insulating pen cap, nor is it necessary to press the limiting blocks by hand.

[0019] Preferably, the outer wall of the metal tube is symmetrically provided with guide grooves, and the two sides of the arc-shaped long plate are symmetrically fixed with guide rods that match the guide grooves. When it is necessary to pull the electric shock rod out of the metal tube or adjust the length of the electric shock rod extending out of the metal tube, press the round block. The round block drives the connecting rod, the arc-shaped long plate, the guide rod and the push block to move down. Since the guide rod is always in the guide groove, the arc-shaped long plate will not shift during the downward movement, and the push block will not be misaligned, so that the limiting block can be accurately squeezed.

[0020] Preferably, the end of the connecting rod away from the round block is threaded to the outer wall of the arc-shaped long plate; when it is necessary to disassemble the arc-shaped long plate, since the connecting rod is threaded to the arc-shaped long plate, it is only necessary to turn the round block, which will cause the connecting rod to rotate and disengage from the arc-shaped long plate. Then, the pen tip and the insulating pen shell can be disassembled and the arc-shaped long plate can be taken out.

[0021] Preferably, the outer wall of the connecting rod is fitted with a spring, and the two ends of the spring abut against the lower end face of the circular block and the lower side wall of the mounting shell, respectively. During the process of removing the electric shock rod, the circular block needs to be pressed. When the electric shock rod is pulled out of the metal tube, since the outer wall of the connecting rod is fitted with a spring, under the spring's restoring force, one end of the spring can automatically push the circular block. The circular block drives the connecting rod and the arc-shaped long plate to move upward, and the arc-shaped long plate drives the push block to move out of the limiting hole. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a test pen that is easy to repair, which is the subject of this utility model patent.

[0023] Figure 2 This is a cross-sectional view of a test pen that is easy to repair, which is part of this utility model patent.

[0024] Figure 3 This is a structural diagram of the pushing component of a test pen that is convenient for maintenance, which is part of this utility model patent.

[0025] Figure 4 This is a perspective view of the pen tip and metal tube of a test pen that is easy to repair, according to this utility model patent.

[0026] Figure 5 This is a structural diagram of the metal tube of a test pen that is easy to repair, which is the subject of this utility model patent.

[0027] Figure 6 This is a structural diagram of a snap-fit ​​assembly for a test pen that is easy to repair, which is part of this utility model patent.

[0028] The reference numerals in the accompanying drawings of the instruction manual include: 1. Insulating pen casing; 2. Pen tip; 3. Metal tube; 4. Contact rod; 5. Round block; 6. Mounting shell; 7. Spring; 8. Connecting rod; 9. Alternating hole; 10. Arc-shaped long plate; 11. Guide rod; 12. Push block; 13. Limiting hole; 14. Guide groove; 15. Limiting block; 16. Connecting cylinder; 17. Support rod; 18. Slot; 19. Spring piece; 20. Mounting groove; 21. Through hole. Detailed Implementation

[0029] 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.

[0030] like Figure 1 , Figure 2 , Figure 4 and Figure 6As shown, a convenient test pen includes an insulating pen shell 1. A pen tip 2 is threadedly connected to the front end of the insulating pen shell 1. A metal tube 3 is coaxially arranged inside the pen tip 2. Several limiting holes 13 are formed on the outer wall of the metal tube 3. A contact rod 4 is snapped into the metal tube 3. A limiting block 15 is installed at the end of the contact rod 4. A connecting cylinder 16 is coaxially arranged inside the pen tip 2. A support rod 17 is fixed to the outer wall of the connecting cylinder 16. The other end of the support rod 17 is fixed to the inner wall of the pen tip 2, supporting the connecting cylinder 16. One end of the metal tube 3 passes through the connecting cylinder 16 and extends out of the end of the pen tip 2. The other end of the metal tube 3 is located inside the insulating pen shell 1. The inner wall of the connecting cylinder 16 is provided with... A snap-fit ​​assembly for snapping the metal tube 3 is provided. The snap-fit ​​assembly includes a mounting groove 20 located on the inner wall of the connecting cylinder 16. Multiple mounting grooves 20 are provided and are evenly distributed in a circumferential array on the inner wall of the connecting cylinder 16. A spring piece 19 is installed on the inner wall of the mounting groove 20. One end of the spring piece 19 is fixed to the inner wall of the mounting groove 20, and the other end of the spring piece 19 is slidably connected inside the mounting groove 20. A slot 18 is provided on the outer wall of the metal tube 3 to cooperate with the spring piece 19. By setting the spring piece 19 and the slot 18 to cooperate, the metal tube 3 can not only be fixed in the connecting cylinder 16, but also be pulled out from the connecting cylinder 16 when needed.

[0031] like Figures 1-5 As shown, a pushing assembly for pushing the limiting block 15 is slidably connected to the outer wall of the metal tube 3. A mounting shell 6 is embedded in the inner wall of the insulating pen shell 1. A clearance hole 9 is opened on the upper end face of the mounting shell 6, and a through hole 21 is opened on the lower end face of the mounting shell 6. A connecting rod 8 is coaxially arranged inside the mounting shell 6. A round block 5 is fixedly connected to one end of the connecting rod 8, and one end of the round block 5 extends out of the clearance hole 9. The other end of the connecting rod 8 passes through the through hole 21 and is detachably connected to the outer wall of the pushing assembly. The pushing assembly includes an arc-shaped long plate 10 detachably connected to the end of the connecting rod 8 away from the round block 5. The end of the connecting rod 8 away from the round block 5 is threadedly connected to the outer wall of the arc-shaped long plate 10. A spring 7 is sleeved on the outer wall of the connecting rod 8, and the two ends of the spring 7 are respectively connected to the lower end of the round block 5. The surface and the lower side wall of the mounting shell 6 abut against each other. When the pressing of the round block 5 stops, under the restoring force of the spring 7, one end of the spring 7 can automatically push the round block 5 upward. Do not pull the round block 5 by hand. The outer wall of the metal tube 3 is symmetrically provided with guide grooves 14. The two sides of the arc-shaped long plate 10 are symmetrically fixed with guide rods 11 that match the guide grooves 14. The curvature of the arc-shaped long plate 10 matches the outer wall of the metal tube 3. The inner wall of the arc-shaped long plate 10 is fixed with push blocks 12 that are opposite to and match the limiting holes 13. Since the guide rods 11 are always in the guide grooves 14, the arc-shaped long plate 10 will not shift during the downward movement. The push blocks 12 will not be misaligned and can accurately squeeze the limiting blocks 15. When pulling the electric shock rod 4, it is not necessary to squeeze the limiting blocks 15 by hand in sequence.

[0032] As can be seen from the above, the specific embodiments of this utility model are as follows:

[0033] When the electric shock rod 4 and the metal tube 3 need maintenance, press the round block 5. The round block 5 drives the connecting rod 8 to move downward. The downward movement of the connecting rod 8 drives the arc-shaped long plate 10 to move downward. The arc-shaped long plate 10 drives the guide rod 11 to move downward along the guide groove 14. At the same time, the arc-shaped long plate 10 drives the push block 12 to move downward until the push block 12 squeezes the limiting block 15, which is locked in the limiting hole 13, out of the limiting hole 13. (When the limiting block is squeezed, it moves downward, and the downward movement of the limiting block squeezes the support spring into the mounting groove.) The part in parentheses is the prior art. The document does not provide detailed descriptions. At this point, pull on one end of the contact rod 4 extending from the metal tube 3 to remove the contact rod 4. Then rotate the circular block 5. Since the connecting rod 8 is threadedly connected to the arc-shaped long plate 10, the rotation of the circular block 5 causes the connecting rod 8 to rotate, disengaging it from the arc-shaped long plate 10. Since the pen tip 2 is threadedly connected to the insulating pen shell 1, twist the pen tip 2, causing it to disengage from the insulating pen shell 1. Remove the arc-shaped long plate 10 and pull on the rear end of the metal tube 3. As the metal tube 3 moves, the inner wall of the slot 18 will push the spring piece 19 out of the slot 18. At this point, it is possible to... After the metal tube 3 is completely pulled out from the rear end, and the electric shock rod 4 and metal tube 3 are repaired, first insert the metal tube 3 into the connecting cylinder 16. When the metal tube 3 moves forward, the outer wall will squeeze the spring piece 19. When the metal tube 3 drives the slot 18 to move to the position opposite to the spring piece 19, the arc-shaped end of the spring piece 19 will be locked into the slot 18. At this time, the metal tube 3 is fixed. Then align the guide rod 11 with the guide groove 14, and clamp the arc-shaped long plate 10 onto the outer wall of the metal tube 3. After tightening the insulating pen shell 1 and the pen tip 2, press and rotate the round block 5 at the same time. The round block 5 drives the connecting cylinder 16 to rotate. After the connecting rod 8 abuts against the arc-shaped long plate 10, it rotates and is threadedly connected to it. At this time, the inner wall of the arc-shaped long plate 10 abuts against the outer wall of the metal tube 3. The push block 12 completely blocks several limiting holes 13. At this time, the electric shock rod 4 is inserted from the front end of the metal tube 3. When the electric shock rod 4 moves to the desired position, the pressing of the round block 5 is stopped. At this time, the round block 5 drives the connecting rod 8 and the arc-shaped long plate 10 to move upward under the restoring force of the spring 7. The upward movement of the arc-shaped long plate 10 will drive the push block 12 to move out of the limiting hole 13. At the same time, the limiting block 15 is engaged in the limiting hole 13 at the desired position.

[0034] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A test pen for easy maintenance, comprising an insulating pen shell (1), a pen tip (2) threadedly connected to the front end of the insulating pen shell (1), a metal tube (3) coaxially disposed inside the pen tip (2), a plurality of limiting holes (13) formed on the outer wall of the metal tube (3), a contact rod (4) snapped into the metal tube (3), and a limiting block (15) installed at the end of the contact rod (4), characterized in that, A connecting cylinder (16) is coaxially arranged inside the pen tip (2). A support rod (17) is fixedly connected to the outer wall of the connecting cylinder (16). The other end of the support rod (17) is fixedly connected to the inner wall of the pen tip (2). One end of the metal tube (3) passes through the connecting cylinder (16) and extends out of the end of the pen tip (2). The other end of the metal tube (3) is located inside the insulating pen shell (1). A snap-fit ​​assembly for snapping the metal tube (3) is provided on the inner wall of the connecting cylinder (16). A sliding connection for snapping the metal tube (3) is provided on the outer wall of the metal tube (3). The pushing assembly of the pushing limit block (15) has an inner wall of the insulating pen shell (1) with a mounting shell (6) embedded in it. The upper end face of the mounting shell (6) has a clearance hole (9) and the lower end face of the mounting shell (6) has a through hole (21). A connecting rod (8) is coaxially arranged inside the mounting shell (6). One end of the connecting rod (8) is fixed to a round block (5). One end of the round block (5) extends out of the clearance hole (9). The other end of the connecting rod (8) passes through the through hole (21) and is detachably connected to the outer wall of the pushing assembly.

2. The convenient test pen for maintenance according to claim 1, characterized in that, The snap-fit ​​assembly includes an installation groove (20) on the inner wall of the connecting cylinder (16), a spring piece (19) is installed on the inner wall of the installation groove (20), one end of the spring piece (19) is fixedly connected to the inner wall of the installation groove (20), and the other end of the spring piece (19) is slidably connected inside the installation groove (20). The outer wall of the metal tube (3) is provided with a snap-fit ​​groove (18) that cooperates with the spring piece (19).

3. The convenient test pen for maintenance according to claim 2, characterized in that, The mounting grooves (20) are multiple and are evenly distributed in a circumferential array on the inner wall of the connecting cylinder (16).

4. The convenient test pen for maintenance according to claim 1, characterized in that, The pushing assembly includes an arc-shaped long plate (10) detachably connected to the end of the connecting rod (8) away from the round block (5). The arc of the arc-shaped long plate (10) matches the outer wall of the metal tube (3). The inner wall of the arc-shaped long plate (10) is fixed with a push block (12) that is opposite to and matches the limiting hole (13).

5. The convenient test pen for maintenance according to claim 4, characterized in that, The outer wall of the metal tube (3) is symmetrically provided with guide grooves (14), and the two sides of the arc-shaped long plate (10) are symmetrically fixed with guide rods (11) that match the guide grooves (14).

6. The convenient test pen for maintenance according to claim 4, characterized in that, The end of the connecting rod (8) away from the round block (5) is threaded to the outer wall of the arc-shaped long plate (10).

7. The convenient test pen for maintenance according to claim 1, characterized in that, The outer wall of the connecting rod (8) is fitted with a spring (7), and the two ends of the spring (7) abut against the lower end face of the round block (5) and the lower side wall of the mounting shell (6), respectively.

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