Test pencil
By designing a extendable metal probe and a press-driven metal shaft system, we ensure that the electric pen test pen only forms a loop under the correct pen holding posture, solving the misjudgment and personal safety problems caused by the wrong pen holding posture, achieving more accurate measurement of live body and a longer service life.
Patent Information
- Application Number
- CN202421102762.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-05-20
AI Technical Summary
When using a test pen to measure whether the charged body is charged, users are prone to failing to contact the metal end of the pen due to incorrect pen holding posture, causing misjudgment or current to pass through the human body, endangering personal safety.
A test pen is designed, with its metal probe located in the pen rod and can extend out. The metal shaft and insulating rod are driven by the pressing of the metal end cap to ensure that the probe only extends when holding the pen correctly, forming a circuit, and ensuring the stability of the circuit through the design of safety resistors and neon tubes.
It effectively avoids misjudgment caused by wrong pen holding posture, ensures accurate measurement of live body, and prevents fingers from contacting metal probes, ensures personal safety, and extends the service life of parts in the electric test pen.
Smart Images
Figure CN222825605U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of testing tools, and more specifically, to an electric test pencil. Background Art
[0002] A test pen, also known as an electrician's test pencil, is an electrical tool used to test whether the wires are energized. There is a neon bulb in the pen body. If the neon bulb lights up during the test, it means that the wire is energized or is a live wire.
[0003] When using a test pen to measure whether a charged object is charged, a circuit needs to be formed between the charged object, the test pen, the human body and the earth in order to accurately measure whether the charged object is charged. Therefore, you must touch the metal part at the tail end of the test pen with your hand. Otherwise, because the charged object, the test pen, the human body and the earth do not form a circuit, the neon bulb in the test pen will not light up, causing a misjudgment that the charged object is not charged. However, in daily life, users do not understand the test pen or are negligent during use, and use the wrong posture to hold the test pen, resulting in no contact between the hand and the metal tail end of the test pen or contact between the hand and the metal probe, resulting in a misjudgment of whether the charged object is charged or the current directly passes through the metal probe through the human body, endangering personal safety. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model aims to provide an electric test pencil.
[0005] The above technical purpose of the utility model is achieved through the following technical solutions: a test pen, including a pen body, a metal end cover, a metal probe, and a spring, a neon tube, and a safety resistor arranged in the pen body. The metal probe is located in the pen body and can extend to the end of the pen body away from the metal end cover. A metal shaft is fixedly connected to a side of the metal end cover close to the pen body, and the metal shaft is slidably connected to the pen body. An insulating rod is fixedly connected between the metal shaft and the metal probe, a metal sleeve is slidably connected to the outer periphery of the metal shaft, and a compression spring is fixedly connected between the upper end of the metal sleeve and the insulating rod.
[0006] By adopting the above technical solution, when the correct pen holding posture is used, that is, when the metal end cap is pressed with the hand, the metal probe can be extended from the pen shaft, ensuring that a circuit is formed when the electric tester is used to measure a charged object, and whether the charged object is charged can be determined more accurately. It also ensures that the fingers do not come into contact with the metal probe during use, thereby ensuring personal safety.
[0007] The utility model is further configured as follows: the lower end of the metal sleeve is fixedly connected to the spring, and the metal sleeve is fixedly connected to the pen holder.
[0008] By adopting the above technical solution, during the process of pressing the metal end cover, the spring, neon tube and safety resistor in the pen holder remain stationary, ensuring that the main test components in the test pen work normally.
[0009] The utility model is further configured as follows: a surface of the safety resistor away from the neon tube is fixedly connected with a metal sleeve, and the metal sleeve is slidably connected with the metal probe.
[0010] By adopting the above technical solution, when the metal probe is extended, the safety resistor abuts against the metal sleeve, ensuring that the circuit inside the test pen is connected during operation.
[0011] The utility model is further configured as follows: a groove is provided on the outer peripheral wall of the metal sleeve, and the insulating rod is slidably matched with the groove.
[0012] By adopting the above technical solution, a groove is provided on the metal sleeve to facilitate the connection between the metal probe and the insulating rod.
[0013] The utility model is further configured as follows: a connecting spring is fixedly connected between the end surface of the metal probe close to the safety resistor and the bottom wall of the metal sleeve.
[0014] By adopting the above technical solution, the connecting spring connects the metal probe and the metal sleeve, and during the sliding process of the metal probe, the metal probe and the metal sleeve always maintain conductivity.
[0015] The utility model is further configured as follows: the distance between the insulating rod and the metal end cover is smaller than the length of the groove.
[0016] By adopting the above technical solution, the moving distance of the metal probe is limited, ensuring that the metal sleeve will not be subjected to the downward pulling force of the insulating rod when the metal probe is extended to the limit.
[0017] The utility model is further configured as follows: the distance between the insulating rod and the metal end cover is smaller than the distance between the metal shaft sleeve and the neon tube.
[0018] By adopting the above technical solution, it is ensured that the metal shaft is always above the neon tube and does not contact the neon tube when the metal end cover is pressed downward, thereby ensuring the safety of the neon tube.
[0019] In summary, the utility model has the following beneficial effects:
[0020] The metal end cap can be pressed so that the metal shaft drives the metal probe to extend out of the pen shaft through the insulating rod. The test pen can only work normally when the user's pen-holding posture is correct, ensuring that there will be no misjudgment of whether the charged body is charged due to the wrong pen-holding posture. At the same time, it can also ensure that the fingers do not touch the metal probe during the operation of the test pen, ensuring personal safety. In addition, a metal shaft sleeve and a metal sleeve are provided to keep the main test components of the test pen except the metal probe stationary, ensuring the stability of the circuit, extending the service life of the parts in the test pen, determining the movement distance of the metal probe, and further protecting the parts in the test pen to ensure that the parts do not collide with each other during use. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of the utility model;
[0022] Figure 2 It is a front view of the utility model;
[0023] Figure 3 for Figure 2 AA section view;
[0024] Figure 4 It is a side view of the utility model;
[0025] Figure 5 for Figure 4 BB cross-sectional view;
[0026] Figure 6 for Figure 4 A partial enlarged view of .
[0027] In the figure: 1. pen holder; 2. metal shaft; 21. insulating rod; 3. metal end cap; 4. compression spring; 5. metal sleeve; 6. spring; 7. neon tube; 8. safety resistor; 9. metal sleeve; 91. groove; 92. connecting spring; 10. metal probe. DETAILED DESCRIPTION
[0028] The utility model is described in detail below in conjunction with the accompanying drawings and embodiments.
[0029] Example:
[0030] like Figures 1 to 6As shown, a test pen comprises a transparent pen body 1, a metal end cap 3, a metal probe 10, and a spring 6, a neon tube 7, and a safety resistor 8 are sequentially arranged in the pen body 1 from the metal end cap 3 to the metal probe 10. The metal probe 10 is in the pen body 1 and can extend from the metal end cap 3 to the metal probe 10. A metal shaft 2 is fixedly connected to a side of the metal end cap 3 close to the pen body 1. The metal shaft 2 is slidably connected to the pen body 1. An insulating rod 21 is fixedly connected between the metal shaft 2 and the metal probe 10. The shape of the insulating rod 21 is concave. A metal sleeve 5 is slidably connected to the outer periphery of the metal shaft 2. A compression spring 4 is fixedly connected between the upper end of the metal sleeve 5 and the insulating rod 21. Pressing the metal end cap 3 will drive the metal shaft 2 connected thereto to move in a direction away from the metal end cap 3, and the insulating rod 21 connected to the metal shaft 2 will drive The metal probe 10 connected to the insulating rod 21 moves together. When the metal probe 10 moves to a certain distance, it will extend out of the pen shaft 1 to measure whether the charged body is charged. Since the insulating rod 21 will squeeze the compression spring 4 when moving downward, when the hand is released from the metal end cover 3, the compression spring 4 will apply a force to the insulating rod 21 in the direction close to the metal end cover 3, so that the insulating rod 21 drives the metal probe 10 to move upward and retract into the pen shaft 1. This test pen can only measure whether the charged body is charged if the correct pen holding posture is used, ensuring that a circuit is formed between the charged body, the test pen, the human body, and the earth during the measurement process. When the test pen can be used normally, it ensures that whether the charged body is charged is accurately judged, and at the same time, it also avoids electric shock caused by fingers touching the metal probe 10 during use, thereby ensuring personal safety.
[0031] The lower end of the metal sleeve 5 is fixedly connected to the spring 6, the metal sleeve 5 is fixedly connected to the pen body 1, and the surface of the safety resistor 7 away from the neon tube 8 is fixedly connected with a metal sleeve 9, and the metal sleeve 9 is slidably connected to the metal probe 10. When the metal end cover 3 is pressed, only the parts above the metal sleeve 5 and the metal probe 10 connected to the insulating rod 21 will be driven to move, so that the remaining parts can form a passage in the test pen and maintain a stable state, thereby ensuring the stability of the test pen, protecting circuit components such as the neon tube 7 and the safety resistor 8, and enabling this test pen to work as stably as other test pens.
[0032] A groove 91 is provided on the outer wall of the metal sleeve 9. The upper end of the insulating rod 21 and the metal shaft 2 as well as the lower end and the metal probe 10 are connected by a plastic rod. The plastic rod passes through the groove 91 and slides with the groove 91. When the metal end cover 3 is pressed, the metal shaft 2 drives the insulating rod 21 to slide in the groove 91, ensuring that a part of the metal probe 10 is always in the metal sleeve 9 when extended. While limiting the moving distance of the metal probe 10, the various components in the test pen are kept in contact during movement, ensuring that all circuit elements in the test pen are connected together to form a path during the measurement process. A connecting spring 92 is fixedly connected between the end face of the metal probe 10 close to the safety resistor 8 and the bottom wall of the metal sleeve 9, which assists the compression spring 4 in pulling back the metal probe 10 and also maintains the connection between the metal sleeve 9 and the metal probe 10.
[0033] The distance between the insulating rod 21 and the metal end cover 3 is smaller than the length of the groove 91, ensuring that the metal sleeve 9 will not be pulled downward by the insulating rod 21 when the metal probe 10 is extended to the limit, ensuring that the safety resistor 8 will not be pulled by the metal sleeve 9 when the metal probe 10 moves to the limit, and the distance between the insulating rod 21 and the metal end cover 3 is smaller than the distance between the metal shaft sleeve 5 and the neon tube 7, ensuring that the metal shaft 2 is always above the neon tube 7 and does not contact the neon tube 7 when the metal end cover 3 is pressed downward, thereby ensuring the safety of the neon tube 7.
[0034] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.
Claims
1. A test pen, comprising a pen holder (1), a metal end cap (3), a metal probe (10), a spring (6), a neon tube (7), and a safety resistor (8) arranged in the pen holder (1), characterized in that: The metal probe (10) is located inside the pen shaft (1) and can extend toward one end of the pen shaft (1) away from the metal end cover (3); a metal shaft (2) is fixedly connected to a side of the metal end cover (3) close to the pen shaft (1); the metal shaft (2) is slidably connected to the pen shaft (1); an insulating rod (21) is fixedly connected between the metal shaft (2) and the metal probe (10); a metal shaft sleeve (5) is slidably connected to the outer periphery of the metal shaft (2); and a compression spring (4) is fixedly connected between the upper end of the metal shaft sleeve (5) and the insulating rod (21).
2. The voltage tester according to claim 1, characterized in that: The lower end of the metal sleeve (5) is fixedly connected to a spring (6), the spring (6) is made of metal, and the metal sleeve (5) is fixedly connected to the pen holder (1).
3. The voltage tester according to claim 1, characterized in that: A metal sleeve (9) is fixedly connected to the surface of the safety resistor (8) away from the neon tube (7), and the metal sleeve (9) is slidably connected to a metal probe (10).
4. The voltage tester according to claim 3, characterized in that: The outer peripheral wall of the metal sleeve (9) is provided with a groove (91), and the insulating rod (21) is slidably matched with the groove (91).
5. The voltage tester according to claim 3, characterized in that: A connecting spring (92) is fixedly connected between the end surface of the metal probe (10) close to the safety resistor (8) and the bottom wall of the metal sleeve (9).
6. The voltage tester according to claim 4, characterized in that: The distance between the insulating rod (21) and the metal end cover (3) is smaller than the length of the groove (91).
7. The voltage tester according to claim 6, characterized in that: The distance between the insulating rod (21) and the metal end cover (3) is smaller than the distance between the metal sleeve (5) and the neon tube (7).