Test pencil convenient for replacing neon tube

Abstract

The utility model discloses a test pencil convenient to replace neon tube, which comprises a penholder and a metal bar arranged at the lower end of the penholder, the penholder is composed of a pen container, a pen cap and a connecting cylinder arranged between the pen container and the pen cap, and the two ends of the connecting cylinder are provided with assembling structures capable of being assembled with the pen cap and the pen container into a whole. A resistor is inserted into the inner wall of the pen container, and a first metal contact head is fixedly installed at the upper end of the resistor. Compared with the prior art, when one of the neon tubes in the two mounting cavities is damaged, the rotating connection cylinder can drive the two neon tubes to rotate synchronously, so that the undamaged neon tube in the two mounting cavities can rotate to the position over the first metal contact head, the second metal contact head on the undamaged neon tube is in contact with the first metal contact head, and the neon tube is prevented from being damaged. The replacement process does not need to disassemble the penholder, the traditional replacement mode that the neon tube and the spring need to be poured out for replacement after the test pencil is disassembled is broken, and the problem that the spring and the resistor are easily lost during high-altitude operation replacement is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of test pencils, in particular to a test pencil with which neon tubes can be easily replaced. Background Art

[0002] A test pen, also known as a "test pen," is an electrical tool used to test whether wires are live. The pen contains a neon bulb. If it glows during testing, it indicates the wire is live or has a live wire. The tip and tail of the test pen are made of metal, while the barrel is made of insulating material.

[0003] Traditional test pens house the neon tube and resistor inside the pen, with a nut and spring at the end. Tightening the nut forces the neon tube to securely contact the resistor. To replace a damaged neon tube, the nut must be unscrewed and the tube removed for replacement. However, this method can easily cause the neon tube and resistor to fall out simultaneously. If the resistor and spring slip out of the operator's hands, they could be lost, making replacement difficult, especially during overhead work. Therefore, we propose a test pen that facilitates neon tube replacement. Utility Model Content

[0004] The purpose of the present invention is to provide a test pencil for convenient replacement of neon tubes, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A test pen for convenient neon tube replacement comprises a penholder and a metal rod disposed at the lower end of the penholder. The penholder is composed of a pen barrel, a pen cap, and a connecting barrel disposed between the pen barrel and the pen cap. Both ends of the connecting barrel are provided with assembly structures capable of being assembled with the pen cap and the pen barrel as a whole. A resistor is inserted into the inner wall of the pen barrel, and a first metal contact is fixedly mounted on the upper end of the resistor. The inner wall of the connecting barrel is provided with two mounting cavities, each of which has a neon tube inserted into its inner wall. A second metal contact is fixedly mounted on the lower end of the neon tube. The inner bottom walls of the two mounting cavities are provided with a through hole for the second metal contact to pass through. The interior of the pen cap is provided with an extrusion structure capable of driving the second metal contact to contact the resistor.

[0007] The assembly structure includes a first internally threaded barrel and a second internally threaded barrel which are rotatably mounted on the upper and lower ends of the connecting barrel respectively. The surfaces of the pen barrel and the pen cap are respectively provided with a first external thread and a second external thread which are compatible with the first internally threaded barrel and the second internally threaded barrel, and the surface of the second internally threaded barrel is provided with a limiting component which can limit the connecting barrel.

[0008] Preferably, the metal rod is fixedly mounted on the lower end of the pen barrel, and the upper end of the metal rod extends to the interior of the pen barrel.

[0009] Preferably, the extrusion structure includes a metal block fixedly mounted on the inner top wall of the pen cap, the upper end of the metal block extends to the outside of the pen cap, the lower end of the metal block is fixedly mounted with a first compression spring, and the lower end of the first compression spring is fixedly mounted with an extrusion plate.

[0010] Preferably, the limiting assembly includes a track groove opened on the outer surface of the second internal threaded cylinder, the inner wall of the track groove is slidably connected with a push block, the upper surface of the push block is fixedly installed with a limiting pin, and the lower end of the connecting cylinder is provided with a limiting groove adapted to the limiting pin.

[0011] Preferably, the number of the limiting grooves is two, and the two limiting grooves are symmetrically arranged at the lower end of the connecting tube.

[0012] Preferably, a second compression spring is fixedly mounted on the inner bottom wall of the track groove, and the other end of the second compression spring is fixedly connected to the lower surface of the push block.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. The utility model provides an assembly structure and a connecting cylinder. After the connecting cylinder is assembled between the pen barrel and the pen cap using the assembly structure, the first compression spring will drive the extrusion plate to contact the neon tube, and the second metal contact head on one of the neon tubes in the two installation cavities will contact the first metal contact head. When a human finger touches the metal block, a circuit can be formed to make the neon tube light up. Compared with the existing technology, when one of the neon tubes in the two installation cavities is damaged, rotating the connecting cylinder can drive the two neon tubes to rotate synchronously, so that the undamaged neon tubes in the two installation cavities can be rotated to just above the first metal contact head, so that the second metal contact head on the undamaged neon tube contacts the first metal contact head. The replacement process does not require disassembly of the pen barrel, breaking the traditional replacement method that requires disassembly of the test pen and then pouring out the neon tube and spring for replacement, avoiding the problem of spring and resistor loss during replacement work at high altitude.

[0015] 2. The utility model is provided with a limit assembly. When the push block is pushed downward, the limit pin will disengage from the limit groove, and the connecting cylinder can rotate. When the connecting cylinder rotates until the second metal contact head on the neon tube contacts the first metal contact head, the push block is loosened, and the reset of the second compression spring will drive the limit pin to insert into the limit groove, thereby limiting the connecting cylinder and preventing the second metal contact head from disengaging from the first metal contact head during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure proposed for the utility model;

[0017] Figure 2 This is a schematic diagram of the front cross-section structure of the pen holder proposed in the utility model;

[0018] Figure 3 This is a schematic diagram of the front cross-section structure of the connecting tube proposed in the utility model;

[0019] Figure 4 This is a schematic diagram of the front cross-section structure of the pen cap proposed in the utility model;

[0020] Figure 5 This is a schematic diagram of the front cross-section structure of the pen holder after assembly proposed in the utility model.

[0021] In the figure: 1 metal rod, 2 pen holder, 3 pen cap, 4 connecting tube, 5 resistor, 6 first metal contact, 7 neon tube, 8 second metal contact, 9 first internally threaded tube, 10 second internally threaded tube, 11 limiting groove, 12 second compression spring, 13 first compression spring, 14 extrusion plate, 15 push block, 16 limiting pin, 17 metal block. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0024] Reference Figure 1-5 A test pen for convenient replacement of neon tubes includes a pen body and a metal rod 1 arranged at the lower end of the pen body. The pen body is composed of a pen barrel 2, a pen cap 3 and a connecting tube 4 arranged between the pen barrel 2 and the pen cap 3. The materials of the pen barrel 2, the pen cap 3 and the connecting tube 4 are all made of transparent plastic. A resistor 5 is inserted into the inner wall of the pen barrel 2. The metal rod 1 is fixedly installed at the lower end of the pen barrel 2, and the upper end of the metal rod 1 extends into the interior of the pen barrel 2. The upper end of the resistor 5 is fixedly installed with a first metal contact head 6. After the resistor 5 is placed into the interior of the pen barrel 2, the lower end of the resistor 5 will contact the upper end of the metal rod 1.

[0025] Two installation cavities are provided on the inner wall of the connecting tube 4, and neon tubes 7 are inserted into the inner walls of the two installation cavities. A second metal contact head 8 is fixedly installed at the lower end of the neon tube 7. Through holes are provided on the inner bottom walls of the two installation cavities for the second metal contact heads 8 to pass through. The two neon tubes 7 are respectively placed in the two installation cavities. At this time, the two second metal contacts 8 will respectively enter the two through holes, and the lower ends of the two second metal contacts 8 will respectively pass through the two through holes.

[0026] Both ends of the connecting tube 4 are provided with an assembly structure that can be assembled with the pen cap 3 and the pen barrel 2 as one. The assembly structure includes a first internally threaded tube 9 and a second internally threaded tube 10 that are rotatably installed on the upper and lower ends of the connecting tube 4 respectively. The surfaces of the pen barrel 2 and the pen cap 3 are respectively provided with a first external thread and a second external thread that are compatible with the first internal thread tube 9 and the second internal thread tube 10. The first internal thread tube 9 and the second internal thread tube 10 are respectively threadedly connected to the first external thread and the second external thread, so that the pen barrel 2, the connecting tube 4 and the pen cap 3 can be assembled as one.

[0027] The interior of the pen cap 3 is provided with an extrusion structure that can drive the second metal contact head 8 to contact the resistor 5. The extrusion structure includes a metal block 17 fixedly mounted on the inner top wall of the pen cap 3. The upper end of the metal block 17 extends to the outside of the pen cap 3. The lower end of the metal block 17 is fixedly mounted with a first compression spring 13, and the lower end of the first compression spring 13 is fixedly mounted with an extrusion plate 14. When the pen barrel 2, the connecting barrel 4 and the pen cap 3 are assembled as one, the first compression spring 13 will drive the lower end of the extrusion plate 14 to contact the neon tube 7. The second metal contact head 8 on one of the neon tubes 7 in the two mounting cavities will contact the first metal contact head 6. When testing the circuit, a human finger touching the metal block 17 can form a circuit to make the neon tube 7 light up.

[0028] The surface of the second internally threaded cylinder 10 is provided with a limiting component that can limit the connecting cylinder 4. The limiting component includes a track groove opened on the outer surface of the second internally threaded cylinder 10. The inner wall of the track groove is slidably connected with a push block 15. A limiting pin 16 is fixedly installed on the upper surface of the push block 15, and a limiting groove 11 adapted to the limiting pin 16 is opened at the lower end of the connecting cylinder 4. A second compression spring 12 is fixedly installed on the inner bottom wall of the track groove. The other end of the second compression spring 12 is fixedly connected to the lower surface of the push block 15. There are two limiting grooves 11, and the two limiting grooves 11 are symmetrically arranged at the lower end of the connecting cylinder 4.

[0029] Push the push block 15 downward, and the limit pin 16 will disengage from the limit groove 11. At this time, the connecting cylinder 4 can rotate. When the connecting cylinder 4 rotates until the second metal contact head 8 on the neon tube 7 contacts the first metal contact head 6, the push block 15 is loosened, and the second compression spring 12 resets to drive the limit pin 16 to insert into the limit groove 11, thereby limiting the connecting cylinder 4 and preventing the second metal contact head 8 from disengaging from the first metal contact head 6 during use.

[0030] Compared with the existing technology, when one of the neon tubes 7 in the two installation cavities is damaged, rotating the connecting tube 4 can drive the two neon tubes 7 to rotate synchronously, so that the other undamaged neon tube 7 in the two installation cavities can be rotated to just above the first metal contact head 6, so that the second metal contact head 8 on the undamaged neon tube 7 contacts the first metal contact head 6. The replacement process does not require disassembly of the pen holder, breaking the traditional replacement method that requires disassembly of the test pen and then pouring out the neon tube 7 and the spring for replacement, avoiding the problem of easy loss of the spring and resistor 5 during replacement during high-altitude operations.

[0031] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A test pen for convenient replacement of neon tubes, comprising a pen holder and a metal rod (1) arranged at the lower end of the pen holder, characterized in that: The pen holder is composed of a pen barrel (2), a pen cap (3), and a connecting barrel (4) arranged between the pen barrel (2) and the pen cap (3); both ends of the connecting barrel (4) are provided with an assembly structure that can be assembled with the pen cap (3) and the pen barrel (2); a resistor (5) is inserted into the inner wall of the pen barrel (2); a first metal contact head (6) is fixedly installed on the upper end of the resistor (5); two mounting cavities are provided on the inner wall of the connecting barrel (4); a neon tube (7) is inserted into the inner wall of the two mounting cavities; a second metal contact head (8) is fixedly installed on the lower end of the neon tube (7); the inner bottom walls of the two mounting cavities are provided with a through hole for the second metal contact head (8) to pass through; and an extrusion structure that can drive the second metal contact head (8) to contact the resistor (5) is provided inside the pen cap (3); The assembly structure comprises a first internally threaded barrel (9) and a second internally threaded barrel (10) which are rotatably mounted on the upper end and the lower end of the connecting barrel (4), respectively; the surfaces of the pen barrel (2) and the pen cap (3) are respectively provided with a first external thread and a second external thread which are compatible with the first internally threaded barrel (9) and the second internally threaded barrel (10), and the surface of the second internally threaded barrel (10) is provided with a limiting component which can limit the connecting barrel (4).

2. The test pen for convenient neon tube replacement according to claim 1, characterized in that: The metal rod (1) is fixedly mounted on the lower end of the pen barrel (2), and the upper end of the metal rod (1) extends to the interior of the pen barrel (2).

3. The test pen for convenient neon tube replacement according to claim 1, characterized in that: The extrusion structure comprises a metal block (17) fixedly mounted on the inner top wall of the pen cap (3), the upper end of the metal block (17) extending to the outside of the pen cap (3), a first compression spring (13) fixedly mounted on the lower end of the metal block (17), and an extrusion plate (14) fixedly mounted on the lower end of the first compression spring (13).

4. The test pen for convenient neon tube replacement according to claim 1, characterized in that: The limiting assembly comprises a track groove provided on the outer surface of the second internally threaded cylinder (10), a push block (15) is slidably connected to the inner wall of the track groove, a limiting pin (16) is fixedly installed on the upper surface of the push block (15), and a limiting groove (11) adapted to the limiting pin (16) is provided at the lower end of the connecting cylinder (4).

5. The test pen for convenient neon tube replacement according to claim 4, characterized in that: There are two limiting grooves (11), and the two limiting grooves (11) are symmetrically arranged at the lower end of the connecting cylinder (4).

6. The test pen for convenient neon tube replacement according to claim 4, characterized in that: A second compression spring (12) is fixedly mounted on the inner bottom wall of the track groove, and the other end of the second compression spring (12) is fixedly connected to the lower surface of the push block (15).

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