Handheld resistance tester

Abstract

The utility model relates to a handheld resistance tester which comprises a tester body, the top of the tester body is provided with a slot, the top of the tester body is rotatably provided with movable rods through damping rotating shafts at four corners of the slot, and the outer surfaces of the two movable rods at the left side and the right side are jointly sleeved with U-shaped blocks; a through hole is formed in the outer surface of the U-shaped block, an inner groove is formed in the movable rod, an ejector rod matched with the through hole is arranged in the inner groove, a first spring is arranged in the inner groove, and the two ends of the first spring abut against the inner wall of the inner groove and the ejector rod correspondingly; a groove is formed in the lower surface of the tester body, the groove is communicated with the slot, and a shielding mechanism is arranged in the groove. The plug is tightly hooked by the U-shaped block, so that the plug can be prevented from loosening due to pulling, the loosening and damage of the slot structure are avoided, and the overall use performance and durability of the tester body are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of resistance tester technology, specifically a handheld resistance tester. Background Technology

[0002] A handheld resistance tester is a portable device specifically designed for accurately measuring the transition resistance of equipotential bonding nodes in metal components. Based on the Wheatstone bridge principle, it utilizes sophisticated measurement circuitry and algorithms to achieve high-precision measurement of low conductor resistance. The measured current and open-circuit voltage meet regulatory requirements. It can be widely used in lightning protection testing, power systems, and the electronics industry to evaluate the performance and safety of lightning protection grounding networks and electrical equipment. It can also be used to measure coil DC resistance, conductor contact resistance, and metal riveting resistance.

[0003] When using a resistance tester, the four-terminal Kelvin test clips need to be inserted into the slots on the tester. However, in actual use, the test clips are often accidentally pulled, which may not only directly cause the connection between the clips and the tester to loosen, thus interfering with the smooth measurement, but may also cause the slot structure to loosen or even be damaged due to long-term stress, ultimately having an adverse effect on the overall performance and durability of the tester. Utility Model Content

[0004] The purpose of this invention is to provide a handheld resistance tester to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows.

[0006] A handheld resistance tester includes a tester body. A slot is located on the top of the tester body. Movable rods are rotatably mounted on the top of the tester body at each of the four corners of the slot via damping shafts. Two U-shaped blocks are fitted onto the outer surfaces of the two movable rods on the left and right sides. Through holes are formed on the outer surfaces of the U-shaped blocks. Inner grooves are formed inside the movable rods. Top rods matching the through holes are installed inside the inner grooves. A first spring is installed inside the inner grooves, with its two ends abutting against the inner wall of the inner grooves and the top rods, respectively. A recess is formed on the top of the tester body, communicating with the slot. A shielding mechanism is installed inside the recess. A display screen is installed on the surface of the tester body. A toggle switch is installed on the side surface of the tester body. A battery compartment is located on the rear side of the tester body, and a battery compartment cover is installed on the outside of the battery compartment.

[0007] Furthermore, the shielding mechanism includes a baffle plate disposed inside the groove. The baffle plate has two parallel guide grooves inside, and the guide grooves have end heads inside. The outer surface of the end heads is connected to guide rods, and the ends of the guide rods are connected to the inner wall of the groove. A second spring is sleeved on the outer surface of the guide rods, and the two ends of the second spring abut against the inner wall of the groove and the baffle plate, respectively.

[0008] Furthermore, a lever is installed on the outer surface of the baffle, and the outer surface of the lever is provided with anti-slip texture.

[0009] Furthermore, the top of the tester body is provided with a recessed part, and when the U-shaped block is placed horizontally, its lower surface is located in the recessed part.

[0010] Furthermore, a limiting groove is provided on the inner wall of the U-shaped block, and a limiting block is provided on the outer surface of the movable rod, with the limiting block set in the limiting groove.

[0011] Furthermore, both the inner groove and the second spring are electroplated.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows.

[0013] 1. This utility model presses the top rod into the U-shaped block, allowing the U-shaped block to stretch upward and flip to the bottom of the test clamp plug. Then, the U-shaped block is pressed down to press it firmly onto the plug. At this time, the top rod is reinserted into the through hole to fix the U-shaped block, thereby ensuring that the U-shaped block can tightly hook the plug, preventing the plug from being pulled loose, and preventing the slot structure from loosening or being damaged, thus ensuring the overall performance and durability of the tester body.

[0014] 2. By setting up a shielding mechanism, this utility model can shield the slot when the tester body is not in use, thereby preventing external dust and impurities from entering the slot, which could lead to poor contact and reduced service life. Attached Figure Description

[0015] Figure 1 This is one of the three-dimensional structural schematic diagrams of this utility model;

[0016] Figure 2 This is the second three-dimensional structural schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the top structure of this utility model;

[0018] Figure 4 This is a partial structural diagram of the top of the present invention;

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of the U-shaped block in this utility model;

[0020] Figure 6 This is a schematic diagram of the shielding mechanism in this utility model;

[0021] Figure 7 A schematic diagram showing the state of the U-shaped block hooking the four-terminal Kelvin test clamp plug.

[0022] In the diagram: 100, Tester body; 101, Slot; 102, Damping shaft; 103, Movable rod; 104, U-shaped block; 105, Inner groove; 106, Top rod; 107, First spring; 108, Through hole; 109, Groove; 110, Display screen; 111, Toggle switch; 112, Battery compartment cover; 200, Covering mechanism; 201, Baffle; 202, Guide rod; 203, End; 204, Second spring; 205, Guide groove; 300, Toggle block; 400, Recess; 500, Limiting groove; 501, Limiting block. Detailed Implementation

[0023] 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.

[0024] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0025] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0026] like Figure 1-7As shown, a handheld resistance tester includes a tester body 100. A slot 101 is provided on the top of the tester body 100. Movable rods 103 are rotatably mounted on the top of the tester body 100 at each of the four corners of the slot 101 via damping shafts 102. U-shaped blocks 104 are fitted onto the outer surfaces of the two movable rods 103 on the left and right sides. Through holes 108 are formed on the outer surface of the U-shaped blocks 104. An inner groove 105 is formed inside the movable rod 103. A top rod 106 matching the through hole 108 is provided inside the inner groove 105. A first spring 107 is provided inside the inner groove 105, with its two ends abutting against the inner wall of the inner groove 105 and the top rod 106, respectively. The top of the tester body 100 is provided with a groove 109, and the groove 109 is connected to the slot 101. A shielding mechanism 200 is provided inside the groove 109. A display screen 110 is provided on the surface of the tester body 100. A toggle switch 111 is provided on the side surface of the tester body 100. A battery compartment is provided on the rear side of the tester body 100. A battery compartment cover 112 is provided on the outside of the battery compartment.

[0027] In use, first remove the obstruction mechanism 200 from the slot 101. Then, insert the four-terminal Kelvin test clip into the slot 101. Next, flip the U-shaped block 104. Since the U-shaped block 104 will be blocked by the plug end of the test clip at this time, press the top rod 106 inward to retract it into the U-shaped block 104. Then, pull the U-shaped block 104 upward so that it can flip to the bottom of the plug without being blocked by the plug. Then, press the U-shaped block 104 back into the movable rod 103 and press it firmly into the bottom of the plug. Under the elastic force of the first spring 107, the top rod 106 is reinserted into the through hole 108 to fix the U-shaped block 104, so that the U-shaped block 104 can tightly hook the plug, preventing the plug from being pulled loose and preventing the slot 101 structure from loosening or being damaged, thus ensuring the overall performance and durability of the tester body 100. The display screen 110 is used to display data, and the toggle switch 111 controls the power supply. The battery compartment can be powered by standard universal lithium batteries or dry batteries, which is convenient for maintenance and use.

[0028] When the tester body 100 is not in use, the shielding mechanism 200 can be used to shield the slot 101 to prevent external dust and impurities from entering the slot 101, which could lead to poor contact and reduced service life.

[0029] Preferably, the shielding mechanism 200 includes a baffle 201 disposed inside the groove 109. The baffle 201 has two parallel guide grooves 205 inside. The guide grooves 205 have end heads 203 inside. The outer surface of the end heads 203 is connected to a guide rod 202. The end of the guide rod 202 is connected to the inner wall of the groove 109. The outer surface of the guide rod 202 is fitted with a second spring 204. The two ends of the second spring 204 abut against the inner wall of the groove 109 and the baffle 201, respectively.

[0030] The guide rod 202 and the end 203 provide a limiting function for the baffle 201, allowing it to slide horizontally and block the slot 101. When the tester body 100 is not in use, the baffle 201 is always blocked on the outside of the slot 101 by the elastic force of the second spring 204, which can effectively prevent dust and impurities from entering the slot 101, causing poor contact and reducing service life.

[0031] Preferably, a lever 300 is installed on the outer surface of the baffle 201, and the outer surface of the lever 300 is provided with anti-slip texture.

[0032] By setting the lever 300, a force point can be provided to facilitate the movement of the sliding baffle 201 to overcome the elastic force of the second spring 204, thus exposing the slot 101 for use.

[0033] Preferably, the top of the tester body 100 is provided with a recess 400, and when the U-shaped block 104 is placed horizontally, its lower surface is located in the recess 400.

[0034] The recessed part 400 eliminates any protruding parts on the top of the tester body 100, improving aesthetics and reducing the risk of bumps and scratches.

[0035] Preferably, a limiting groove 500 is formed on the inner wall of the U-shaped block 104, and a limiting block 501 is provided on the outer surface of the movable rod 103, with the limiting block 501 disposed in the limiting groove 500.

[0036] By setting the limiting groove 500 and the limiting block 501, the range of motion of the U-shaped block 104 can be limited to prevent it from detaching from the movable rod 103 and affecting its use.

[0037] Preferably, both the inner groove 105 and the second spring 204 are electroplated.

[0038] Electroplating can give the outer surface of the inner groove 105 and the second spring 204 an electroplated layer, which has good physical, chemical and mechanical properties and can effectively improve the rust resistance of the inner groove 105 and the second spring 204.

[0039] The above is a detailed description of the present invention in conjunction with specific embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, any equivalent substitutions or obvious modifications made without departing from the concept of the present invention, and which have the same performance or use, should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. A handheld resistance tester, comprising a tester body (100), wherein a slot (101) is provided on the top of the tester body (100), characterized in that: The top of the tester body (100) and at the four corners of the slot (101) are all equipped with movable rods (103) that are rotatably mounted via damping shafts (102). The outer surfaces of the two movable rods (103) on the left and right sides are all fitted with U-shaped blocks (104). The outer surface of the U-shaped block (104) is provided with a through hole (108), the inside of the movable rod (103) is provided with an inner groove (105), a top rod (106) matching the through hole (108) is provided inside the inner groove (105), and a first spring (107) is provided inside the inner groove (105). The two ends of the first spring (107) abut against the inner wall of the inner groove (105) and the top rod (106) respectively. The top of the tester body (100) is provided with a groove (109), and the groove (109) is connected to the slot (101). A shielding mechanism (200) is provided inside the groove (109). A display screen (110) is provided on the surface of the tester body (100). A toggle switch (111) is provided on the side surface of the tester body (100). A battery compartment is provided on the rear side of the tester body (100). A battery compartment cover (112) is provided on the outside of the battery compartment.

2. The handheld resistance tester according to claim 1, characterized in that: The shielding mechanism (200) includes a baffle (201) disposed inside the groove (109). The baffle (201) has two parallel guide grooves (205) inside. The guide grooves (205) have end heads (203) inside. The outer surface of the end head (203) is connected to a guide rod (202), and the end of the guide rod (202) is connected to the inner wall of the groove (109). The outer surface of the guide rod (202) is fitted with a second spring (204), and the two ends of the second spring (204) abut against the inner wall of the groove (109) and the baffle (201) respectively.

3. A handheld resistance tester according to claim 2, characterized in that: The outer surface of the baffle (201) is equipped with a lever (300), and the outer surface of the lever (300) is provided with anti-slip texture.

4. A handheld resistance tester according to claim 1, characterized in that: The top of the tester body (100) is provided with a recess (400), and when the U-shaped block (104) is placed horizontally, its lower surface is located in the recess (400).

5. A handheld resistance tester according to claim 1, characterized in that: The inner wall of the U-shaped block (104) is provided with a limiting groove (500), and the outer surface of the movable rod (103) is provided with a limiting block (501), which is located in the limiting groove (500).

6. The hand-held resistance tester of claim 2, wherein: the inner groove (105) and the second spring (204) are both plated.

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