JP3069754U - Wire connection terminal - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an electric wire connection terminal which has a low manufacturing cost, a stable electric connection state, and does not cause chattering due to shock or vibration. SOLUTION: A single punched and bent metal leaf spring is loaded in a housing formed of an insulator,
The metal leaf spring has a pair of long arm structures, a first gripping portion that grips the inserted wire end portion, and a pair of short arm structures that hold the wire end portion gripped by the first gripping portion. It further includes a second gripping portion for gripping, and a printed circuit board connecting piece projecting outside the housing.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is used for communication line connection. The present invention is used for connecting to equipment, connecting relay junctions, and so on. The present invention relates to a terminal structure for stably connecting a copper wire coated one by one with a plastic insulating material to a circuit formed on a printed board for a long period of time.

[0002]

[Prior art]

 As a communication cable, a multi-pair cable including a large number of copper wires one by one covered with a plastic insulating material is widely used to construct a communication line. This multi-pair cable needs to be connected to the in-station equipment and the in-home equipment at its starting point and end point. In addition to multi-pair cables, it may be necessary to connect a pair of wires, and in the case of a ground wire, a single wire may need to be connected. Connection terminals are used for such connection.

Conventionally, soldering connections, screw connections, lapping connections, and the like have been used as connection terminal structures for this purpose. These connections require tools, respectively, and require a work for connection. The man-hour is large. For this reason, clamp connections have been used. This is because a spring structure is provided inside the connection terminal, the end of the wire is stripped, and the copper wire is simply inserted into the spring structure to connect the wire electrically and mechanically. Structure. By using such connection terminals, the number of work steps for connecting a large number of pairs of wires has been significantly reduced.

[0004] The structure of such a connection terminal that is currently used includes an electric wire holding piece made of a leaf spring formed so as to apply a strong contact pressure to an electric wire to be connected, and an electric wire holding the electric wire holding piece. And two metal members of a metal frame for electrical connection. These two metal members need to be formed using dedicated assembling equipment. This has a significant effect on manufacturing costs, and the assembling accuracy of the two metal members is an important factor in maintaining stable contact. In the case of using two metal members, the occupied space is inevitably increased, and there is a limit in meeting the demand for miniaturizing terminals.

To improve this, there is an attempt to configure a connection terminal using one metal member instead of two metal members (Japanese Patent Laid-Open No. 4-230967). In this method, one plate-shaped metal spring material is bent into a stub and loaded into a housing formed of an insulating material so as to be pushed into the housing. In this structure, the tip of the electric wire is mechanically held by using the spring force generated between both ends of the plate-shaped metal spring material, and the electrical contact state between the metal spring material and the electric wire is changed. It is structured to maintain.

[0006]

[Problems to be solved by the invention]

 The terminal structure of the conventional example disclosed in the above publication has one metal spring member, and thus has advantages such as a low manufacturing cost, a small number of assembling steps, and a small occupied space. However, it was found that there was a problem in maintaining a constant electrical connection state under various conditions. In other words, in this conventional structure, the electric wire is held down by using the spring force generated between both ends of a single leaf spring. Therefore, when a slight vibration is applied, the spring force fluctuates and the connection state is changed. Fluctuates. That is, it was found that chattering occurred. In particular, in this structure, the spring vibrates to generate a large chatter in response to the vibration of the portion acting as the metal spring near the resonance frequency. This chattering involves an instantaneous interruption of the communication line and is not sufficient for use in high-speed digital communication lines. In a line to which direct current is applied, an arc is generated due to chattering, which changes the quality of the metal material, which may cause deterioration of a long-term connection state.

[0007] The present invention has been made in such a background, and by utilizing a single metal leaf spring, it is possible to reduce the cost while taking advantage of the advantage. An object is to provide a stable connection terminal. In other words, the present invention is a terminal structure that can be connected simply by stripping off and coating the end of the wire without requiring connection work such as soldering, screwing, or wrapping. It is another object of the present invention to provide an electric wire connection terminal whose manufacturing cost is low, its electric connection state is stable, and chattering does not occur against shock or vibration. An object of the present invention is to provide a stable connection terminal having a plurality of contact points between a leaf spring and an electric wire, each of which has a different resonance frequency.

[0008]

[Means for Solving the Problems]

 The present invention is an electric wire connection terminal having a structure in which a single punched and bent metal leaf spring (1) is loaded in a housing (10) formed of an insulator. The metal leaf spring (1) comprises a pair of long arm structures, a first gripper (2) for gripping an inserted wire end, and a pair of short arm structures. There is provided a second holding portion (3) for further holding the end of the electric wire held by the one holding portion, and a printed board connecting piece (4) protruding outside the housing.

The numerals in the parentheses are the reference numerals of the drawings of the embodiments. The reference numerals in the drawings are for reference only so that the structure of the present invention can be easily understood, and are not intended to limit the scope of the present invention to the structure illustrated in the drawings of the embodiments.

As described above, by utilizing a metal plate spring obtained by bending a material punched from a single metal flat plate, the advantage that the number of assembling steps and costs can be reduced is utilized, and the electrical connection state is reduced. A stable connection terminal can be realized.

[0011] It is desirable that the first gripping portion and the second gripping portion have different angles at which the wires are gripped by approximately 90 degrees. As a result, even if vibration occurs with respect to vibration from one direction of the electric wire, the vibration should be small for the gripping portion that grips the electric wire in a direction different from the direction by approximately 90 degrees. Connection state can be maintained.

[0012] It is desirable that the natural vibration frequency of the first grip portion and the natural vibration frequency of the second grip portion are different. That is, it is desirable that the mechanical natural vibration frequency of the first grip portion as a spring is different from the mechanical natural vibration frequency of the second grip portion as a spring. More specifically, it is desirable to design the natural vibration frequencies of these two gripping portions so that they are not close enough to cause a resonance phenomenon, and are independent natural vibration frequencies that are not related to the overtone frequency.

The natural vibration frequencies of the two grips can be designed to be different natural frequencies because the arm of the first grip is longer than the arm of the second grip. The frequency of the vibration is not only related to the arm's length but also to its width, so care should be taken in its design.

With this, even if one of the grips resonates with the vibration applied from the outside, the other grip does not resonate with the vibration. Even if resonance occurs to hinder the gripping of the electric wire and a failure such as an instantaneous interruption of current occurs, the electric wire can be reliably gripped by the other gripping portion. Therefore, it is possible to avoid an inconvenience such as instantaneous interruption of current as the whole wire connection terminal, and to realize a wire connection terminal which does not cause chattering due to shock or vibration.

In a state where the metal plate spring is bent, it is preferable that a portion excluding the connection piece for a printed board has a shape that can be accommodated in a space in a rectangular parallelepiped housing. This has the advantages that the structure of the housing can be simplified and a large number of connection terminals can be arranged and used. In addition, this structure can reduce the number of assembly steps and the size of the product.

It is preferable that the housing is provided with a release button for temporarily reducing a pressing force generated on the electric wire held by the first holding portion. Thus, when the connection of the electric wires needs to be changed, the electric wires inserted into the first holding portion can be removed without being damaged.

[0017]

[Embodiment of the invention]

 An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing a material shape of an electric wire connection terminal punched from a metal flat plate and a shape of the electric wire connection terminal after the bending process. FIG. 1A is a plan view of a stamped metal leaf spring, and FIG. 1B is a perspective view showing a state in which the leaf spring is folded. FIG. 2 is a view showing the electric wire connection terminals housed in the housing. FIG. 3 is a diagram illustrating a state in which the second gripper grips the electric wire. FIG. 4 is a diagram illustrating an electric wire gripping function of the first gripping portion. FIG. 5 is a sectional perspective view of the electric wire connection terminal housed in the housing.

In the present invention, as shown in FIG. 1, a metal leaf spring 1 punched and bent from one metal flat plate is loaded in a housing 10 formed of an insulator as shown in FIG. The present invention is characterized in that the metal plate spring 1 has a pair of long arm structures, and has a first holding portion 2 which holds an inserted wire end. It comprises a pair of short arm structures, a second gripping portion 3 for further gripping the end of the electric wire gripped by the gripping portion 2, and a printed board connecting piece 4 protruding outside the housing 10.

In the example shown in FIG. 2, the housing 10 is placed on the plane of the printed circuit board 30, and the metal plate spring 1 is mechanically and electrically connected to the wiring pattern 31 of the printed circuit board 30 by soldering 40. This is an example of connection. Regarding the mounting structure of the wire connection terminal of the present invention, depending on the use form, there are ones mounted on an equipment panel, ones supported only by wires to be connected and which do not attach the housing 10 particularly to other structures, There are various types of mounting structures that bundle and use wire connection terminals. These mounting structures are well-known and are appropriately designed according to the usage environment, and are not directly related to the purpose of the present invention. Therefore, the description of each of them is omitted here. .

As shown in FIGS. 1 and 2, in a state where the metal plate spring 1 is bent, a portion excluding the print plate connection piece 4 has a shape which can be directly accommodated in the space inside the housing 10 having a rectangular parallelepiped shape. It is.

When the electric wire 20 is inserted, in order to prevent the electric wire 20 from being accidentally pulled out, the tip of the metal fitting bites into the holding member 2 at an acute angle with respect to the direction in which the electric wire 20 is pulled out. It has a structure that strongly resists it. Therefore, as shown in FIG. 2, the housing 10 is provided with a release button 11 for temporarily reducing the pressing force generated on the electric wire 20 held by the holding portion 2. On the other hand, as shown in FIG. 3, the grip 3 has a structure in which the electric wire 20 is sandwiched from both sides. The electric wire 20 can be inserted and removed without requiring the operation by the button 11.

As described above, since the electric wire connection terminal of the present invention holds the electric wire 20 by the two holding portions 2 and 3, the electric connection state is stable, and chattering is prevented against shock and vibration. An electric wire connection terminal that does not occur can be realized. Further, the gripping function of the gripper 2 will be described with reference to FIG. As shown in FIG. 4, each part of the gripping part 2 is described with reference numerals such as A part, B, C, D direction, E direction, F point, G, and H.

Looking at the portion A, B corresponds to the function of the electric wire gripping piece, and C corresponds to the function of the receiving frame. The structure of C has a shape that is nearly parallel to the insertion direction of the electric wire 20, and the tip of the inserted electric wire 20 reaches the point F along the surface of C. At this time, B 2 is mainly spread by insertion of the electric wire 20. Further, B bites into the surface of the electric wire 20 at an acute angle with respect to the direction in which the electric wire 20 is extracted, so that it is possible to prevent the electric wire from being accidentally extracted. Furthermore, both B and C have elasticity, and have a structure that can follow the movement of the gripped wire 20 in the D and E directions. Thus, even when vibration is applied to the electric wire 20, since B and C absorb the vibration, it is possible to avoid the occurrence of an electrical instantaneous interruption.

The gripping portion 2 and the gripping portion 3 grip the electric wire 20 at two points, so that a stronger electric wire gripping force is generated. That is, the gripping portion 2 and the gripping portion 3 have different angles at which the wire 20 is gripped by approximately 90 degrees. Thereby, the resistance to the vibration of the electric wire 20 from all directions can be exerted uniformly. Further, the natural vibration frequency of the gripper 2 as a spring is different from the natural vibration frequency of the gripper 3 as a spring, and the natural vibration frequencies of the two grippers 2 and 3 are close enough to cause a resonance phenomenon. Since it is not a frequency but an independent natural vibration frequency that is not related to the overtone frequency, even if one of the grips 2 or 3 resonates with externally applied vibration, the other grips. Since the part 3 or 2 does not resonate with the vibration, even if one of the gripping parts 2 or 3 resonates and hinders the gripping of the electric wire 20, even if a failure such as a momentary interruption of the current occurs. On the other hand, the electric wire 20 can be surely gripped by the other gripping part 3 or 2. Therefore, it is possible to avoid an inconvenience such as an instantaneous interruption of current as a whole of the wire connection terminal, and to realize a wire connection terminal which does not cause chattering due to shock or vibration.

As shown in FIG. 5, a release button 11 is mounted on the upper part of the housing 10 so that the electric wire 20 can be released from the gripping by the gripping portion 2.

[0026]

[Effect of the invention]

 As described above, according to the present invention, it is possible to realize an electric wire connection terminal that has a low manufacturing cost, a stable electric connection state, and does not cause chattering due to shock or vibration.

[Brief description of the drawings]

FIG. 1 is a diagram showing a material shape of an electric wire connection terminal punched from a metal flat plate and a shape of the electric wire connection terminal after bending. (A) is a plan view, (b) is a perspective view.

FIG. 2 is a diagram showing an electric wire connection terminal housed in a housing.

FIG. 3 is a diagram illustrating a state in which the second gripping portion grips the electric wire.

FIG. 4 is a diagram illustrating an electric wire gripping function of a first gripping portion.

FIG. 5 is a sectional perspective view of an electric wire connection terminal accommodated in a housing. The foremost terminal is drawn so that the front surface is broken so that the internal structure can be understood.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal leaf spring 2, 3 Gripping part 4 Connection piece for printed board 10 Housing 11 Release button 20 Electric wire 30 Printed circuit board 31 Wiring pattern 40 Solder

Claims (5)

[Utility model registration claims] 1. A wire connection terminal having a structure in which a single punched and bent metal leaf spring is loaded in a housing formed of an insulator, wherein the metal leaf spring is formed of a pair of long arm structures. A first gripper for gripping an inserted wire end; a second gripper having a pair of short arm structures and further gripping the wire end gripped by the first gripper; and the housing. An electric wire connection terminal, comprising: a printed board connection piece protruding outside. 2. An electric wire connection terminal according to claim 1, wherein said first gripping portion and said second gripping portion are different from each other by an angle at which said wire is gripped by approximately 90 degrees. 3. The electric wire connection terminal according to claim 2, wherein a natural vibration frequency of said first grip portion is different from a natural vibration frequency of said second grip portion. 4. In a state where the metal leaf spring is bent,
4. The electric wire connection terminal according to claim 3, wherein a portion other than the printed board connection piece has a shape that can be accommodated in a rectangular parallelepiped housing interior space. 5. An electric wire connection terminal according to claim 4, wherein said housing is provided with a release button for temporarily reducing a pressing force generated on the electric wire held by said first holding portion.