Clamp meter with inward-opened jaw

Abstract

The clamp meter comprises a body, a measuring circuit is arranged in the body, a movable arm and a fixed arm are arranged on the upper portion of the body, a handle is arranged on the side portion of the body, the butt joint opening of the movable arm and the fixed arm forms the jaw, one end of the fixed arm is fixedly installed on the body, and one end of the movable arm is hinged to the body. The handle is connected with the hinged end of the movable arm through the connecting rod transmission mechanism, and the movable arm can be driven to rotate towards one side of the fixed arm along the hinged point by pressing the handle through the connecting rod transmission mechanism so that the jaw can be opened. According to the clamp meter designed by the invention, the jaw adopts an inward opening design, that is, the fixed arm is kept immobile, the movable arm is driven by the pressing handle to rotate inwards to open the jaw, and due to the structural design, the jaw is opened inwards, so that the clamp meter does not occupy external operation space, and is particularly suitable for measurement in occasions with limited space. Moreover, due to the inward-opening structure, the wire is not easy to fall off from the inside of the jaw of the clamp meter, and compared with an outward-opening structure, the inward-opening structure is higher in reliability.

Description

Technical Field

[0001] The invention relates to a clamp meter for measuring current or voltage, in particular to a clamp meter with inwardly opened jaws. Background Art

[0002] The clamp meter (also called clamp-type meter or clamp meter) is mainly used to test voltage, current, frequency and other related parameters. It is one of the necessary test tools for electricians in daily maintenance work. It mainly opens the jaws by pressing the trigger, so that the measured wire is embedded in the jaws through the opened gap. The jaws are mainly composed of two clamp arms. In the prior art, some clamp meters design both clamp arms as movable arms, that is, after pressing the trigger, the two clamp arms open outward at the same time; some clamp arms are designed as movable arms and the other clamp arm as fixed arms, that is, after pressing the trigger, the fixed arm does not move, and only the movable arm opens outward. Regardless of which of the above structures is used, the clamp arms in the prior art are designed to open outward. This type of clamp meter with outward-opening jaws has the following shortcomings: (1) The jaws of the clamp meter open outwards and require a large operating space. For some occasions where the space is narrow and the wires are densely packed, the jaws of this clamp meter that opens outwards are difficult to open, and the wire to be tested cannot be inserted into the jaws, which is inconvenient to operate; (2) The docking port of the two clamp arms in most clamp meters is designed to be located in the center of the top of the jaws. This type of outward-opening jaws is prone to wire disconnection. When the clamp meter is pulled downward during measurement, the wire embedded in the jaws can easily come out of the docking port at the top. (3) Because the jaws open outward, the wire embedded in the jaws is too thick or the clamp meter is subjected to external force, which will cause the wire to squeeze the two clamp arms of the jaws outward, resulting in the jaws being unable to close effectively, affecting the measurement use of the clamp meter. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the outward-opening clamp meter, the present invention designs a clamp meter with inward-opening jaws, which can effectively make up for the above-mentioned deficiencies.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A clamp meter with an inwardly opened jaw comprises a main body, a measuring circuit is arranged inside the main body, a movable arm and a fixed arm are arranged on the upper part of the main body, and a handle is arranged on the side of the main body, characterized in that the fixed arm comprises a horizontal connecting part and vertical connecting parts located at both ends of the horizontal connecting part, the vertical connecting part and the horizontal connecting part are connected as a whole to form an inverted U-shaped structure, the length of the vertical connecting part fixedly connected to the main body is greater than the length of the vertical connecting part connected to the movable arm, the bottom of the longer vertical connecting part is fixedly mounted on the main body, and the shorter vertical connecting part is connected to the movable arm to form a jaw, the connecting surface between the fixed arm and the movable arm is an inclined surface, and the inclined surface is low on the outside and high on the inside, the bottom end of the movable arm is hinged on the main body, the handle is connected to the hinged end of the movable arm through a connecting rod transmission mechanism, and the handle can be pressed to drive the movable arm to rotate along the hinge point to the side close to the fixed arm through the connecting rod transmission mechanism to open the jaw.

[0005] Furthermore, a return spring is provided on the main body, and the hinged end of the movable arm is connected to the return spring.

[0006] Furthermore, the connecting rod transmission mechanism includes a first connecting rod located at the top and a second connecting rod located at the bottom, the bottom of the handle and the bottom of the second connecting rod are hinged on the main body, the top of the second connecting rod is hinged to the bottom of the first connecting rod, and the top of the first connecting rod is hinged to the bottom of the boom.

[0007] The clamp meter designed by the present invention has an inner opening design for the jaws, that is, the fixed arm remains stationary, and the movable arm rotates inwards to open the jaws under the drive of the pressing handle. This structural design does not occupy external operating space because the jaws are inner opening, and is particularly suitable for measurement in space-constrained occasions. In addition, this inner opening structure makes it difficult for the wire to fall out of the jaws of the clamp meter, and its reliability is higher than that of the outer opening structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the clamp meter of the present invention in a closed state; Figure 2 This is a schematic diagram of the clamp meter of the present invention in an open state.

[0009] Description of Figure Numbers: 1. Main body; 2. Handle; 3. Fixed arm; 4. Moving arm; 5. Return spring; 6. First connecting rod; 7. Second connecting rod; 8. Wire. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0011] This embodiment discloses a clamp meter with an inwardly opened jaw. The internal measurement circuit and measurement principle of the clamp meter belong to the known prior art. The present invention only improves the structure of the jaw part of the clamp meter. Figure 1 andFigure 2 The clamping jaw opening and closing structure will be mainly described. A measuring circuit is provided inside the body 1 of the clamp meter. An openable and closable clamping arm is provided on the upper part of the body 1. In this embodiment, the clamping arm is divided into a rotatable moving arm 4 and a fixed stationary arm 3. A handle 2 for controlling the rotation of the moving arm 4 by pressing is provided on the side of the body 1. The stationary arm 3 has an overall inverted U-shaped structure, that is, it includes a horizontal connecting portion and vertical connecting portions at both ends of the horizontal connecting portion. The two vertical connecting portions on both sides are integrally connected to the horizontal connecting portion. For the convenience of description, Figure 1 the vertical connecting portion shown in contact with the moving arm 4 is called the left vertical connecting portion, and the other is called the right vertical connecting portion. The bottom end of the right vertical connecting portion is fixedly connected to the body 1, and the bottom end of the left vertical connecting portion forms an inclined docking surface. The vertical length of the right vertical connecting portion is greater than that of the left vertical connecting portion, so that the opening and closing position of the clamping jaw is on the side, rather than at the top in the prior art.

[0012] Continuing the above introduction, the bottom end of the moving arm 4 is hinged to the body 1, and the top surface of the moving arm 4 forms an inclined docking surface. The inclined directions of the docking surfaces of the moving arm 4 and the left vertical connecting portion are the same, that is, the outside of the inclined surface is low and the inside is high. The bottom end of the handle 2 is hinged to the body 1, and the top end of the handle 2 is suspended. By pressing the top end of the handle 2, the moving arm 4 can be rotated along the bottom hinge point to the side of the clamping jaw cavity. After the clamping jaw is opened, the wire 8 can be inserted or removed from the opened clamping jaw. There are many mechanisms in the prior art that can realize the rotation control of the moving arm 4 by the handle 2. The structure of the trigger pressing to control the rotation of the clamping arm in the clamp meter in the prior art is slightly complicated, and the occupied area of the transmission structure is also relatively large, which is not conducive to miniaturization of the volume. The purpose of this embodiment is to realize the miniaturization of the volume of the clamp meter and reduce the occupation of external space, so that the clamp meter can perform measurement work in a narrow space. Therefore, the handle 2 of this embodiment is connected to the bottom end of the moving arm 4 through a link transmission mechanism.

[0013] The link transmission mechanism can have various structural designs. This embodiment adopts Figure 1 the simplest structure shown, that is, the link transmission mechanism includes a first link 6 located in the upper part and a second link 7 located in the lower part. The bottom of the handle 2 and the bottom of the second link 7 are hinged to the body 1. The top of the second link 7 is hinged to the bottom of the first link 6, and the top of the first link 6 is hinged to the bottom of the moving arm 4. A return spring 5 is installed on the body 1 to connect the bottom hinge end of the moving arm 4 to the return spring 5.

[0014] As Figure 2 shown, the opening process of the clamping jaw is as follows: When the top end of the handle 2 is pressed, the hinge point where the first link 6 is connected to the second link 7 moves closer to the inside of the body 1, the vertical lengths of the two links increase, and the moving arm 4 is driven to rotate inward to open the clamping jaw. As Figure 1As shown, after the handle 2 is released, under the action of the return spring 5, the moving arm 4 is pulled to rotate outward to close the jaws. At this time, the hinge point where the first link 6 is connected to the second link 7 moves outward from the main body 1 and returns to the initial state.

[0015] Since the present invention adopts an inward-opening structure for the jaws, no external space needs to be occupied when the jaws are opened. Therefore, in the case of a narrow operating space with dense wires, it is very easy to implement the measurement and maintenance work of the wire 8 with the clamp meter of this embodiment. Moreover, in this embodiment, the opening and closing position of the jaws is designed on the side rather than the top surface, and the butt joint surface of the jaws adopts an inclined surface that is lower outside and higher inside, so that the wire 8 embedded inside the jaws is not easily detached from the jaws, and the reliability is higher compared with the outward-opening jaws in the prior art. Although pressing the moving arm 4 inward can also achieve the purpose of opening the jaws, for a clamp meter with a small size, the jaw size is very small. In the case of dense wires and a narrow space such as the maintenance of air-conditioning lines, it is necessary to insert the clamp meter into the dense wire cluster for operation. Obviously, the method of manually pressing the moving arm 4 is not suitable. Therefore, this embodiment adopts the handle 2 and the link transmission mechanism to realize the rotation control of the moving arm 4, which is easier to operate.

[0016] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamp meter with inward-opening jaws, comprising a body. A measuring circuit is provided inside the body. A moving arm and a fixed arm are provided on the upper part of the body. A handle is provided on the side part of the body. It is characterized in that: The fixed arm includes a horizontal connecting part and vertical connecting parts located at both ends of the horizontal connecting part. The vertical connecting part and the horizontal connecting part are connected as a whole to form an inverted U-shaped structure. The length of the vertical connecting part fixedly connected to the main body is greater than the length of the vertical connecting part connected to the movable arm. The bottom of the longer vertical connecting part is fixedly installed on the main body, and the shorter vertical connecting part is connected to the movable arm to form a jaw. The docking surface between the fixed arm and the movable arm is an inclined surface, and the inclined surface is low on the outside and high on the inside. The bottom end of the movable arm is hinged to the main body, and the handle is connected to the hinged end of the movable arm through a connecting rod transmission mechanism. Pressing the handle can drive the movable arm to rotate along the hinge point to the side close to the fixed arm through the connecting rod transmission mechanism to open the jaw.

2. The clamp meter with inward-opening jaws according to claim 1, characterized in that: The main body is provided with a return spring, and the hinged end of the movable arm is connected with the return spring.

3. The clamp-type ammeter with inward-opening jaws according to claim 1, characterized in that: The connecting rod transmission mechanism includes a first connecting rod located at the upper part and a second connecting rod located at the lower part, the bottom of the handle and the bottom of the second connecting rod are hinged on the body, the top of the second connecting rod is hinged to the bottom of the first connecting rod, and the top of the first connecting rod is hinged to the bottom of the boom.

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