Meter pen of universal meter

Abstract

The utility model belongs to the field of measuring probes used for measuring electrical variables, and particularly relates to a meter pen of a universal meter. The utility model provides a meter pen of a universal meter, and aims to solve the technical problem that the meter pen falls off from a binding post under the action of gravity after a worker loosens the hand due to the fact that the length of a part of the binding post pointing downwards or horizontally arranged and capable of being clamped by the meter pen is relatively short, and the meter pen is very inconvenient to use. The meter pen of the universal meter comprises a shell, a meter pen wire and an elastic clamping structure electrically connected with the meter pen wire, the front end of the shell is provided with an avoiding space, the elastic clamping structure is arranged in the avoiding space, and the elastic clamping structure comprises a nut clamping part used for clamping a nut and a binding post clamping part used for clamping a tested binding post. Meanwhile, the nut clamping part and the binding post clamping part are arranged, so that the meter pen clamps the nut and the binding post to be tested at the same time, it is guaranteed that the meter pen does not fall off from the binding post after a worker loosens the hand, the use experience of the worker is optimized, and use is convenient.

Description

Technical Field

[0001] The utility model belongs to the field of measuring probes used for measuring electric variables, in particular to a test pen of a multimeter. Background Art

[0002] In the construction process of railway electrical engineering, multimeters are often used as measuring tools for measurement and verification. When calibrating or measuring the terminal block with traditional needle test pens, two test pens connected to the same multimeter must be used to touch different core wires back and forth. When operating alone, because both hands are occupied by the test pens, it is impossible to look at drawings, check or record at the same time, and other operators are often required to cooperate, which wastes manpower and has low work efficiency.

[0003] To solve the above problems, a Chinese utility model patent with authorization announcement number CN218824435U and authorization announcement date 2023.04.07 discloses a multimeter test lead, including a test lead outer sleeve (equivalent to a shell) and a test lead wire for electrically connecting to a multimeter, and an elastic adapter sleeve (equivalent to an elastic clamping structure for clamping a terminal) is provided at the front end of the test lead outer sleeve, and the front end of the elastic adapter sleeve has a terminal clamping portion with an inner diameter smaller than the outer diameter of the terminal to be measured, so that the terminal can be elastically clamped by the terminal clamping portion when in use; the test lead wire is electrically connected to the terminal clamping portion.

[0004] When using the multimeter probe, the terminal is directly inserted into the probe outer sleeve, and the terminal clamping part is stretched open by the terminal, so that the terminal clamping part clamps the terminal to fix the probe on the terminal, freeing the hands of the staff, making it easier for the staff to read drawings, check or record, saving manpower and improving work efficiency. Among them, the probe outer sleeve is also provided with a locking part for clamping the tested terminal when the tested terminal is high, so that the locking part and the terminal clamping part clamp the tested terminal at the same time, improving the stability and reliability of fixing the probe on the tested terminal.

[0005] However, in the process of using the above-mentioned multimeter probe, it was found that since wires and nuts had been installed on some of the terminals pointing downward, and the length of the part of the terminal that was passed through the nut for the probe to clamp was relatively short, when the terminal was arranged horizontally and the terminal was clamped by the terminal clamping part, the probe would move downward under the action of gravity and fall off the terminal after the staff let go. It would be more likely to fall off when the terminal pointed directly downward or diagonally downward, causing the staff to have to hold the probe all the time, which was very inconvenient to use. Utility Model Content

[0006] The utility model aims to provide a test lead of a multimeter to solve the technical problem that, because the length of the portion of the terminal that partially points downward and can be clamped by the test lead is short, when the terminal is horizontally arranged and points directly downward or obliquely downward, the test lead will fall off the terminal under the action of gravity after the staff lets go, which is very inconvenient to use.

[0007] To achieve the above purpose, the technical solution of the test lead of the multimeter provided by the utility model is:

[0008] A test lead of a multimeter comprises a shell, on which a test lead wire for electrically connecting to the multimeter and an elastic clamping structure electrically connected to the test lead wire are provided, the axial direction of the shell is defined as a front-to-back direction, the front end of the shell has an escape space for a tested terminal and a nut on the tested terminal to extend into, the elastic clamping structure is arranged in the escape space, and the elastic clamping structure comprises a nut clamping portion for clamping the nut and a terminal clamping portion for clamping the tested terminal; the diameter of the inscribed circle of the nut clamping portion is greater than the diameter of the inscribed circle of the terminal clamping portion, and the nut clamping portion is arranged in front of the terminal clamping portion.

[0009] Furthermore, the elastic clamping structure includes a nut clamping device for clamping the nut, the nut clamping device includes at least two first clamping springs for pressing different sides of the nut, and the parts of all the first clamping springs for clamping the nut constitute a nut clamping portion.

[0010] Furthermore, a boss and a spring clip slot are provided on the shell, one end of the first clamping spring is clamped in the spring clip slot, and the other end has a stop portion for cooperating with the boss along the axial stop of the shell.

[0011] Furthermore, a gap of a set length extending in the front-rear direction is provided between the boss and the stop portion, so that the stop portion cooperates with the boss stop after the first clamping spring is deformed by the nut and the stop portion moves backwards by a set stroke.

[0012] Furthermore, a guide through hole is provided on the shell body for cooperating with the first clamping elastic piece in guiding movement when the first clamping elastic piece moves, and a part of the first clamping elastic piece is located in the guide through hole.

[0013] Furthermore, the shell is composed of a first shell and a second shell that are interlocked, and the first shell and the second shell are each provided with two installation channels for forming two guide through holes respectively after the first shell and the second shell are assembled, and the number of first clamping springs is two and they are respectively arranged in different installation channels of the same shell.

[0014] Furthermore, the elastic clamping structure includes a terminal clamping device for clamping the terminal to be tested, the terminal clamping device includes at least two second clamping springs, and the parts of all the second clamping springs for clamping the terminal to be tested constitute the terminal clamping part.

[0015] Furthermore, a limiting member is provided on the shell, and at least one of the second clamping elastic sheets is fixed to the shell through the limiting member and cooperates with the inner wall of the shell to guide the corresponding first clamping elastic sheet.

[0016] Furthermore, the shell is composed of a first shell and a second shell that are buckled together, and the elastic clamping structure includes a terminal clamping device for clamping the terminal to be tested, and the terminal clamping device includes four second clamping springs, each of which includes an annular portion with a notch, and the parts of all the annular portions close to the center of the shell together constitute the terminal clamping portion; the shell is provided with a limiting member for fixing two of the second clamping springs, the limiting member is arranged in the annular portion of the corresponding second clamping spring and cooperates with the annular portion in the front-to-back direction, and the starting end of the corresponding second clamping spring cooperates with the limiting member to prevent the second clamping spring from moving forward as a whole; the shell is also provided with a connecting member for fixing the other two second clamping springs, and the connecting member has a fixed slot on one side close to the shell for clamping the starting end of the corresponding second clamping spring, and the connecting member is provided with a limiting slot, and the shell is provided with a limiting protrusion inserted into the limiting slot, and the limiting protrusion and the limiting slot are stoppered in the front-to-back direction.

[0017] Furthermore, each second clamping spring also includes a cantilever portion, the cantilever portion and the annular portion are integrally formed to form a "6"-shaped structure, a second clamping spring guide through hole is provided on the shell, and the end of the second clamping spring passes through the second clamping spring guide through hole to enable the cantilever portion to cooperate with the second clamping spring guide through hole in guiding movement.

[0018] The beneficial effects of the test lead of the multimeter of the utility model are as follows: the utility model is an improved invention. The housing can provide an installation position for the test lead wire and the elastic clamping structure, and the test lead wire electrically connected to the elastic clamping structure can transmit the signal to the multimeter; for the technical solution in which the test lead only clamps the terminal to be tested, by setting a nut clamping part and a terminal clamping part, the staff can use the nut clamping part and the terminal clamping part to clamp the nut and the terminal to be tested respectively when using the test lead in the technical solution. At this time, the contact area between the test lead and the nut and the terminal to be tested is greater than the contact area when the test lead only contacts the terminal to be tested in the prior art, thereby preventing the test lead from falling off the terminal after the staff lets go, optimizing the staff's use experience, and making it easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a structural schematic diagram of a first specific implementation mode of a test lead of a multimeter of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the first specific implementation mode of the test lead of the multimeter of the utility model with part of the housing omitted;

[0021] Figure 3 This is a structural schematic diagram of the first specific implementation mode of the test lead of the multimeter of the utility model after omitting all the housings;

[0022] Figure 4 It is a structural schematic diagram of the elastic clamping structure of the first specific implementation mode of the test lead of the multimeter of the utility model;

[0023] Figure 5 for Figure 4 A schematic structural diagram of a second clamping spring fixed to the housing;

[0024] Figure 6 for Figure 5 A schematic diagram of the structure of the connecting parts in FIG.

[0025] Figure 7 for Figure 4 A schematic structural diagram of a first clamping spring piece and a second clamping spring piece fixed to the first clamping spring piece;

[0026] Figure 8 It is a structural schematic diagram of the second clamping spring piece of the first specific implementation mode of the test lead of the multimeter of the utility model;

[0027] Fig. 9 It is a structural schematic diagram of the latch of the housing of the first specific implementation mode of the test lead of the multimeter of the utility model;

[0028] Fig.10 It is a structural schematic diagram of the terminal clamping device of the second specific implementation mode of the test lead of the multimeter of the utility model.

[0029] Description of reference numerals:

[0030] 1. Shell; 11. Guide groove; 12. Limit groove; 13. Boss; 14. Limit member; 15. Stop member; 16. Installation channel; 17. Spring clip slot; 18. Latch; 19. Second clamping spring clip guide hole; 110. Limiting protrusion; 2. Test lead; 3. Nut clamping device; 31. First clamping spring; 311. Stopper; 32. Nut clamping part; 4. Terminal clamping device; 4', Terminal clamping device; 41. Second clamping spring; 411. Starting end; 412. End; 41', Second clamping spring; 42. Connector; 421, Slot; 422, Fixed slot; 423, Limiting slot; 43, Terminal clamping part; 5. Probe; 6. Conductive connector; 7. Operation block. DETAILED DESCRIPTION

[0031] In order to solve the problems in the background technology, the core inventive concept of the utility model is: a nut clamping part and a terminal clamping part are provided at the same time, so that the test lead can clamp the nut and the terminal to be tested at the same time, ensuring that the test lead falls off the terminal after the staff lets go, thereby optimizing the staff's usage experience and facilitating use.

[0032] The present invention is further described in detail below in conjunction with the embodiments.

[0033] The specific embodiment of the test lead of the multimeter provided by the utility model is as follows:

[0034] like Figure 1-9 As shown, as a specific embodiment, the test lead of the multimeter includes a shell 1, and the shell 1 is provided with a test lead line 2 for electrically connecting to the multimeter and an elastic clamping structure electrically connected to the test lead line 2. The axial direction of the shell 1 is defined as the front-to-back direction. The front end of the shell 1 has an escape space for the tested terminal and the nut on the tested terminal to extend into. The elastic clamping structure is arranged in the escape space, and the elastic clamping structure includes a nut clamping portion 32 for clamping the nut on the tested terminal and a terminal clamping portion 43 for clamping the tested terminal; the diameter of the inscribed circle of the nut clamping portion 32 is larger than the diameter of the inscribed circle of the terminal clamping portion 43, and the nut clamping portion 32 is arranged in front of the terminal clamping portion 43.

[0035] Specifically, the elastic clamping structure includes a nut clamping device 3 for clamping a nut and a terminal clamping device 4 for clamping a terminal to be tested, the part of the nut clamping device 3 for clamping the nut constitutes a nut clamping portion 32, and the part of the terminal clamping portion 43 for clamping the terminal to be tested constitutes a terminal clamping portion 43. The diameter of the inscribed circle of the nut clamping portion 32 is used to be smaller than the outer diameter of the nut on the terminal to be tested and larger than the outer diameter of the terminal to be tested, so as to clamp the nut and allow the terminal to be tested to pass through when in use; the diameter of the inscribed circle of the terminal clamping portion 43 is used to be smaller than the outer diameter of the terminal to be tested, so as to clamp the part of the terminal to be tested that passes through the nut clamping portion 32 when in use.

[0036] Specifically, the elastic clamping structure and the test lead 2 are electrically connected via a conductive connector 6, and the conductive connector 6 can be a commonly used conductive connector 6 such as a wire, a conductive sheet or a conductive bar. Figure 3 As shown, as a specific implementation, the conductive connector 6 is conductively connected to the test lead 2 and the terminal clamping device 4 respectively; but in other specific implementations, the conductive connector 6 can also be conductively connected to the test lead 2 and the nut clamping device 3 respectively; of course, in other specific implementations, the conductive connector 6 can also be conductively connected to the test lead 2, the nut clamping device 3 and the terminal clamping device 4 at the same time.

[0037] The shell 1 can provide an installation position for the test lead 2 and the elastic clamping structure. The test lead 2 electrically connected to the elastic clamping structure can transmit the signal to the multimeter; for the technical solution in which the test lead only clamps the terminal to be tested, by providing the nut clamping portion 32 and the terminal clamping portion 43, the staff can use the nut clamping portion 32 and the terminal clamping portion 43 to respectively clamp the nut and the terminal to be tested when using the test lead in the technical solution. At this time, the contact area between the test lead and the nut and the terminal to be tested is larger than the contact area when the test lead only contacts the terminal to be tested in the prior art, thereby preventing the test lead from falling off the terminal after the staff lets go, thereby optimizing the staff's user experience and facilitating use.

[0038] like Figure 2-4 As shown in Figure 7, in order to simplify the structure, as a specific embodiment, the elastic clamping structure includes a nut clamping device 3 for clamping the nut, and the nut clamping device 3 is composed of two first clamping springs 31 for pressing different sides of the nut, and the parts of all the first clamping springs 31 for clamping the nut constitute the nut clamping part 32, which has a simple structure. However, in other specific embodiments, for hexagonal nuts, the number of first clamping springs 31 can also be three, four, five or six; for octagonal nuts, the number of first clamping springs 31 can also be seven or eight; for twelve-angle nuts, the number of first clamping springs 31 can also be nine, ten, eleven or twelve. In this embodiment, there is no restriction on the number of first clamping springs 31, as long as all the first clamping springs 31 can be pressed against the side wall of the nut so that the nut clamping device 3 clamps the nut. As a specific embodiment, when the conductive connector 6 is a conductive sheet, the conductive sheet can be integrally formed with the first clamping spring 31.

[0039] In other specific embodiments, the nut clamping device 3 can also be an elastic clamping device such as a finger spring. In this embodiment, there is no restriction on the structure of the nut clamping device 3, as long as the nut clamping device 3 can clamp the nut and cooperate with the nut in an axially movable manner.

[0040] like Figure 2-4 As shown in FIGS. 7-9, in order to conveniently install the first clamping spring 31, as a specific embodiment, the housing 1 is provided with a boss 13 and a spring slot 17, one end of the first clamping spring 31 is clamped in the spring slot 17, and the other end has a stopper 311 for cooperating with the boss 13 along the axial stop of the housing 1, so that the first clamping spring 31 is conveniently installed in the housing 1. Of course, in other specific embodiments, a fixing column can also be provided on the housing 1, and the first clamping spring 31 has a fixing ring sleeved on the fixing column, so that the first clamping spring 31 is fixed on the housing 1; of course, in other specific embodiments, the first clamping spring 31 can also be bonded or screwed on the housing 1. In this embodiment, there is no restriction on the structure of the first clamping spring 31 and the installation method of the first clamping spring 31 and the housing 1, as long as the nut clamping device 3 composed of all the first clamping springs 31 can clamp the nut to fix the test lead when in use.

[0041] like Figure 2-4 As shown in Figures 7-8, in order to enable the first clamping spring 31 to better clamp the nut, as a specific embodiment, there is a gap of a set length extending in the front-to-back direction between the boss 13 and the stopper 311, so that after the first clamping spring 31 is deformed by the nut and the stopper 311 moves backwards for a set stroke, the stopper 311 stops and cooperates with the boss 13, so that the first clamping spring 31 can better clamp the nut. However, in other specific embodiments, the first clamping spring 31 can also be completely fixedly connected to the housing 1, and only the deformation of the first clamping spring 31 itself is used to ensure that the nut can enter the nut clamping portion 32.

[0042] like Figure 2-4 As shown in Figures 7-9, in order to make the first clamping spring 31 move better, as a specific embodiment, a guide through hole is provided on the housing 1 for guiding and moving with the first clamping spring 31 when the first clamping spring 31 moves, and a part of the first clamping spring 31 is located in the guide through hole, and the first clamping spring 31 is guided by the guide through hole, so as to ensure that the first clamping spring 31 moves according to a predetermined trajectory. However, in other specific embodiments, the guide through hole may not be provided, and the outer wall of the second clamping spring 41 of the terminal clamping device 4 and the inner wall of the housing 1 may be used to guide the first clamping spring 31.

[0043] like Figure 1-4As shown in FIGS. 7-9 , in order to conveniently install the nut clamping device 3 on the housing 1, as a specific embodiment, the housing 1 is composed of a first housing and a second housing that are buckled, and the first housing and the second housing are each provided with two installation channels 16 for forming two guide through holes respectively after the first housing and the second housing are assembled, and the number of the first clamping spring pieces 31 is two and they are respectively arranged in different installation channels 16 of the same housing 1. When the first housing and the second housing are separated, the first clamping spring piece 31 can be conveniently installed in the installation channel 16, and then, the first housing and the second housing are closed, so that the guide through hole that cooperates with the first clamping spring piece 31 can be formed, and the structure is simple and the installation is convenient.

[0044] However, in other specific embodiments, the housing 1 may also be an integrated structure. Since the first clamping spring 31 is elastic, the first clamping spring 31 may be inserted into the guide through hole from the front end of the housing 1, and the first clamping spring 31 may be fixed in the spring slot 17. In other specific embodiments, all the first clamping springs 31 may be fixedly connected as one. In this case, the nut clamping device 3 includes the first clamping spring 31 and the connecting portion connecting the first clamping spring 31, and the nut clamping device 3 is an integrated structure. When installing the nut clamping device 3, the nut clamping device 3 may be loaded into the housing 1 from the front end of the housing 1, or the first housing and the second housing may be separated and the nut clamping device 3 may be installed on the housing 1. Of course, in other specific embodiments, the nut clamping device 3 and the terminal clamping device 4 may be integrally formed, and the nut clamping device 3 and the terminal clamping device 4 may be installed on the housing at one time. Specifically, the integrally formed nut clamping device 3 and the terminal clamping device 4 may be fixed on the housing by bonding or welding.

[0045] like Figure 2-8 As shown, in order to simplify the structure, as a specific embodiment, the elastic clamping structure includes a terminal clamping device 4 for clamping the terminal to be tested, and the terminal clamping device 4 includes four second clamping springs, wherein the outer walls of the two second clamping springs 41 cooperate with the inner wall of the housing 1 to guide the first clamping spring 31, and the two second clamping springs 41' are separately fixed on the housing 1, and the parts of all the second clamping springs for clamping the terminal to be tested constitute the terminal clamping portion 43. However, in other specific embodiments, the number of the second clamping springs can also be two, three or more.

[0046] As a specific implementation, when the conductive connector 6 is a conductive sheet, the conductive sheet can be integrally formed with the second clamping spring sheet. Specifically, the test lead 2 can be conductively connected to one second clamping spring sheet, or it can be conductively connected to two, three or more second clamping spring sheets. When the number of second clamping spring sheets conductively connected to the test lead 2 is more, the resistance between the test lead 2 and the tested terminal is smaller. Of course, in different specific implementations, the test lead 2 can also be conductively connected to different numbers of first clamping spring sheets 31, or the test lead 2 can be conductively connected to different numbers of first clamping spring sheets 31 and different numbers of second clamping spring sheets at the same time.

[0047] In other specific embodiments, the first clamping spring piece 31 and the second clamping spring piece 41' may be clamping spring pieces that do not contact each other, and each clamping spring piece is fixed to the housing 1 respectively; or, the second clamping spring pieces 41 cooperate with the housing 1 to guide the corresponding first clamping spring piece 31, for example, the number of the second clamping spring pieces 41 is two, and both cooperate with the housing 1 to guide the corresponding first clamping spring piece 31, or, there are four second clamping spring pieces 41, six first clamping spring pieces 31, and four second clamping spring pieces 41 They respectively cooperate with the shell 1 to guide the corresponding first clamping springs 31, and the remaining two second clamping springs 41' are arranged separately on the shell 1; in this embodiment, there is no restriction on the number of first clamping springs 31 and second clamping springs, nor is there any restriction on the number of second clamping springs 41 that cooperate with the shell 1 to guide the corresponding first clamping springs 31, as long as the number of first clamping springs 31 and second clamping springs can ensure that the nut clamping device 3 and the terminal clamping device 4 can respectively clamp the nut and the terminal to be tested.

[0048] like Fig.10 As shown, as another specific implementation, the terminal clamping device 4' is an elastic retaining spring, which can clamp the terminal to be tested. At this time, the first clamping spring 31 can be fixedly connected to the elastic retaining spring, or the elastic retaining spring and the first clamping spring 31 can be separately fixed to the housing 1; or, in other specific implementations, the terminal clamping device 4 is a finger spring. In this embodiment, there is no restriction on the structure of the terminal clamping device 4, as long as the terminal clamping device 4 can clamp the terminal to be tested and can be movably matched with the terminal to be tested along the axial direction of the terminal to be tested. Of course, the nut clamping device 3 can also be Fig.10 The elastic retaining spring shown in .

[0049] In order to conveniently fix the elastic retaining spring, as a specific embodiment, a stopper 15 is provided on the housing 1, which cooperates with the two ends of the elastic retaining spring along the axial stop of the elastic retaining spring, so as to conveniently fix the elastic retaining spring on the housing 1. Specifically, the stopper 15 can be a structure such as a stop rod or a stop plate. However, in other specific embodiments, the elastic retaining spring can also be fixedly connected to the first clamping spring 31, and the elastic retaining spring can be indirectly fixed to the housing 1 by fixing the first clamping spring 31 on the housing 1; or, the elastic retaining spring can be directly bonded or welded to the housing 1. In this embodiment, there is no restriction on the fixed connection method of the elastic retaining spring and the housing 1, as long as the elastic retaining spring can be fixedly connected to the housing 1 to avoid shaking of the elastic retaining spring during use.

[0050] like Figure 8-9 As shown, in order to conveniently fix the second clamping spring piece 41 that is in guiding contact with the first clamping spring piece 31, as a specific implementation, a stopper is provided on the housing 1, and the two second clamping spring pieces 41 are fixed to the housing 1 through the stopper and cooperate with the inner wall of the housing 1 to guide the corresponding first clamping spring piece 31. Specifically, in the front-to-back direction, each second clamping spring piece 41 is respectively stopped and cooperated with two different stoppers in different directions to fix the second clamping spring piece 41 on the housing 1; the outer wall of the second clamping spring piece 41 and the inner wall of the housing 1 form a guiding structure for guiding the first clamping spring piece 31.

[0051] However, in other specific embodiments, the second clamping spring 41 may include a stop ring sleeved on a single stopper to fix the second clamping spring 41 through the single stopper. In this embodiment, the structure of the second clamping spring 41 and the method of fixing it to the housing 1 are not limited.

[0052] like Figure 2-9As shown, in order to simplify the structure, as a specific implementation method, the terminal clamping device 4 includes four second clamping springs, each of which includes an annular portion with a notch, and the parts of all the annular portions close to the center of the shell 1 together constitute the terminal clamping portion 43; the shell is provided with a stopper 14 for fixing two of the second clamping springs 41, the stopper 14 is arranged in the annular portion of the corresponding second clamping spring 41 and stops with the annular portion along the front and rear directions, and the starting end 411 of the corresponding second clamping spring 41 stops with the stopper 14 The shell 1 is also provided with a connecting piece 42 for fixing the other two second clamping spring pieces 41'. The connecting piece 42 has a fixed card slot 422 on the side close to the shell 1 for clamping the starting end of the corresponding second clamping spring piece 41'. The connecting piece 42 is provided with a limit card slot 423. The shell 1 is provided with a limit protrusion 110 inserted into the limit card slot 423. The limit protrusion 110 and the limit card slot 423 are both stopped in the front-to-back direction to ensure that the second clamping spring piece 41' does not slide in the front-to-back direction as a whole. Specifically, there are two limit members 14 in the annular portion, one of which is stopped and cooperated with the starting end 411 of the second clamping spring piece 41, and the other limit member 14 is stopped and cooperated with the front end stop of the annular portion to prevent the second clamping spring piece 41 from moving backward as a whole. However, in other specific embodiments, only one limit member 14 that is stopped and cooperated with the annular portion in the front-to-back direction can be set in the annular portion.

[0053] Specifically, one of the housing 1 and the connecting member 42 is provided with a slot 421, and the other is provided with a latch 18 corresponding to the slot 421. The housing 1 and the connecting member 42 are plugged and fixed by the slot 421 and the latch 18, so that the connecting member 42 is conveniently fixed to the housing 1. Specifically, the slot 421 is provided on the connecting member 42, and the latch 18 is provided on the housing 1; however, in other specific embodiments, the slot 421 may also be provided on the housing 1, and the latch 18 may be provided on the connecting member 42; or, in other specific embodiments, the connecting member 42 may be fixed to the housing 1 by screwing or bonding. In this embodiment, the fixed connection method of the connecting member 42 and the housing 1 is not limited; at the same time, the second clamping spring 41' may also be fixed to the connecting member 42 by screwing, welding, etc., and in this embodiment, the fixing method of the second clamping spring 41' and the connecting member 42 is not limited.

[0054] Of course, the second clamping spring piece 41 can also be installed on the housing 1 by means of clamping, welding or bonding, and the method for installing the second clamping spring piece 41 on the housing 1 is not limited in this embodiment.

[0055] By making the structures of the four second clamping springs completely identical, the structure can be simplified, and by utilizing the limit member 14, the connecting member 42 and the starting end of the second clamping spring, different second clamping springs can be conveniently installed on the shell 1 in different ways when the first shell and the second shell are separated, so that the installation is convenient; the annular portion has a notch, so that the annular portion can be conveniently elastically deformed when the terminal clamping portion 43 contacts the terminal to be tested.

[0056] like Figure 8-9 As shown, since the annular portion has a notch, a part of the annular portion will move in the front-to-back direction. In order to conveniently guide the second clamping spring piece, as a specific embodiment, each second clamping spring piece also includes a cantilever portion, and the cantilever portion and the annular portion are integrally formed to form a "6"-shaped structure. The housing 1 is provided with a second clamping spring piece guide through hole 19, and the end 412 of the second clamping spring piece 41 passes through the second clamping spring piece guide through hole 19 so that the cantilever portion and the second clamping spring piece guide through hole 19 are guided and moved in coordination, thereby ensuring that the second clamping spring piece 41 always moves in a set trajectory. Of course, a corresponding second clamping spring piece guide through hole 19 can also be provided for the second clamping spring piece 41' connected to the connecting piece 42. However, in other specific embodiments, the second clamping spring piece guide through hole 19 and the cantilever portion may not be provided. When in use, it is necessary to slowly insert the tested terminal into the test lead, thereby avoiding violent movement of the second clamping spring piece and ensuring that the second clamping spring piece does not dislocate.

[0057] like Figure 1-3 As shown, in order to enable the test lead to adapt to various working conditions, as a specific implementation method, the housing 1 is also provided with a probe 5 electrically connected to the test lead line 2 and a control structure for controlling the axial movement of the probe 5 along the housing 1. In the movement stroke of the probe 5, the probe 5 has one end extending from the housing 1 for contacting the wiring to be tested at a measuring position and a avoidance position located on the side of the terminal clamping device 4 away from the nut clamping device 3 to avoid interference between the probe 5 and the wiring to be tested. Therefore, when there is no wiring post and nut to be tested at the wiring to be tested, the probe 5 is extended from the housing 1 to measure the corresponding data. At this time, the probe 5 is in the measuring position; when there is a wiring post and nut to be tested at the wiring to be tested, the probe 5 is retracted into the housing 1, and the corresponding data is measured using the elastic clamping structure. At this time, the probe 5 is in the avoidance position.

[0058] Specifically, the control structure includes an operating block 7 fixedly connected to the measuring needle 5, a guide groove 11 and a limit groove 12 arranged on the housing 1, and the position of the measuring needle 5 is controlled by controlling the position of the operating block 7. Of course, in other specific embodiments, the control structure can also be a rotary control structure, and the position of the measuring needle 5 is controlled by screwing the control cylinder. This part is also a prior art (for example, the Chinese utility model patent with the authorization announcement number CN219737595U), which will not be repeated here.

[0059] However, in other specific implementations, the probe 5 may not be provided in the test lead, so that the test lead in this embodiment is dedicated to the tested terminal with a nut. When measuring the tested connection point without the tested terminal and the nut, the test lead of the multimeter can be replaced with a test lead with a test lead with a probe 5 in the prior art.

[0060] Reference Figure 1 As shown, in other specific embodiments, a magnet can also be provided in the operating block 7. When the staff is reading drawings, checking or recording, they can use the magnet in the operating block 7 to adsorb the test lead on the metal object, freeing the hands of the staff. In a specific embodiment, the operating block 7 is detachably connected to the test lead. The original operating block 7 on the test lead can be removed and replaced with the operating block 7 with a magnet, which can effectively reduce costs.

[0061] Finally, it should be noted that the above are only preferred embodiments of the utility model and are not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A probe of a multimeter, comprising a housing, a probe wire for electrically connecting to the multimeter and an elastic clamping structure electrically connected to the probe wire, characterized in that: The axial direction of the shell is defined as the front-to-back direction, and the front end of the shell has an escape space for the tested terminal and the nut on the tested terminal to extend into, the elastic clamping structure is arranged in the escape space, and the elastic clamping structure includes a nut clamping portion for clamping the nut and a terminal clamping portion for clamping the tested terminal; the diameter of the inscribed circle of the nut clamping portion is larger than the diameter of the inscribed circle of the terminal clamping portion, and the nut clamping portion is arranged in front of the terminal clamping portion.

2. The test lead of a multimeter as claimed in claim 1, characterized in that: The elastic clamping structure includes a nut clamping device for clamping the nut, the nut clamping device includes at least two first clamping springs for pressing different sides of the nut, and the parts of all the first clamping springs for clamping the nut constitute a nut clamping portion.

3. The test lead of a multimeter as claimed in claim 2, characterized in that: A boss and a spring clip slot are provided on the shell, one end of the first clamping spring is clamped in the spring clip slot, and the other end has a stopper for cooperating with the boss along the axial stop of the shell.

4. The test lead of a multimeter as claimed in claim 3, characterized in that: There is a gap of a set length extending in the front-rear direction between the boss and the stop portion, so that the stop portion cooperates with the boss stop after the first clamping spring is deformed by the nut and the stop portion moves backwards for a set stroke.

5. The test lead of a multimeter as claimed in claim 4, characterized in that: The shell body is provided with a guide through hole for cooperating with the first clamping elastic piece in guiding movement when the first clamping elastic piece moves, and a part of the first clamping elastic piece is located in the guide through hole.

6. The test lead of a multimeter as claimed in claim 5, characterized in that: The shell is composed of a first shell and a second shell that are buckled together, and the first shell and the second shell are each provided with two installation channels for forming two guide through holes respectively after the first shell and the second shell are assembled. The number of first clamping springs is two and they are respectively arranged in different installation channels of the same shell.

7. The test lead of a multimeter as claimed in any one of claims 2 to 6, characterized in that: The elastic clamping structure comprises a terminal clamping device for clamping the terminal to be tested, the terminal clamping device comprises at least two second clamping springs, and the parts of all the second clamping springs for clamping the terminal to be tested constitute the terminal clamping part.

8. The test lead of a multimeter as claimed in claim 7, characterized in that: A limiting member is provided on the shell, and at least one of the second clamping elastic sheets is fixed to the shell through the limiting member and cooperates with the inner wall of the shell to guide the corresponding first clamping elastic sheet.

9. The test lead of a multimeter as claimed in any one of claims 1 to 5, characterized in that: The shell is composed of a first shell and a second shell that are buckled together, and the elastic clamping structure includes a terminal clamping device for clamping the terminal to be tested, and the terminal clamping device includes four second clamping springs, each of which includes an annular portion with a notch, and the parts of all the annular portions close to the center of the shell together constitute the terminal clamping portion; a limiting member for fixing two of the second clamping springs is provided on the shell, and the limiting member is arranged in the annular portion of the corresponding second clamping spring and cooperates with the annular portion in the front-to-back direction, and the starting end of the corresponding second clamping spring cooperates with the limiting member to prevent the second clamping spring from moving forward as a whole; a connecting member for fixing the other two second clamping springs is also provided on the shell, and a fixing groove for clamping the starting end of the corresponding second clamping spring is provided on the side of the connecting member close to the shell, and a limiting groove is provided on the connecting member, and a limiting protrusion inserted into the limiting groove is provided on the shell, and the limiting protrusion and the limiting groove are stopped and cooperated in the front-to-back direction.

10. The test lead of a multimeter as claimed in claim 9, characterized in that: Each second clamping spring also includes a cantilever portion, the cantilever portion and the annular portion are integrally formed to form a "6"-shaped structure, a second clamping spring guide through hole is provided on the shell, and the end of the second clamping spring passes through the second clamping spring guide through hole to enable the cantilever portion to cooperate with the second clamping spring guide through hole in guiding movement.

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