JPH0425811Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a screw-clamping connector, and more particularly to a screw-clamping connector that can prevent over-tightening of screws and facilitate the removal of screws.

[Conventional technology]

In general, for screw-clamp connectors that prevent over-tightening of screws and are easy to remove,
For example, there is a device as described in Japanese Patent Application Laid-Open No. 63-13283. The connector according to this invention is
As shown in FIGS. 5 and 6, in order to facilitate the connection of the housings, a bolt member 1 having a threaded portion 1a at the tip is provided on the female housing A, and a nut member 2 is provided on the male housing B. The bolt member 1 and the nut member 2 are screwed together to provide a force for connecting the housings A and B. Also, female housing A and male housing B
When the connection is completed, the threaded part 1a of the bolt member
The screwing of the bolt member 1 and the nut member 2 is completed, and the bolt member 1
The screws are designed to rotate idly to prevent damage to the housing etc. due to over-tightening of the screws. Furthermore, bolt member 1 and female housing A
A spring means 3 is compressed between the bolt member 1 and the nut member 2, and an axial tensile force f is applied to the bolt member 1 when the screwing of the bolt member 1 and the nut member 2 is completed. Since this tensile force f acts constantly, the bolt member 1 is held in a position where it can be re-screwed with the nut member 2, so that the screws can be easily tightened after the housings are connected, and the connected housings can be easily separated. It's summery.

[The problem that the idea attempts to solve]

However, in the above-mentioned conventional screw-clamping connector, since the tensile force f in the axial direction is always acting on the bolt member 1, the threaded portion 1a of the bolt member in the idling state after the screwing with the nut member 2 is completed. The thread 4 at the end collides with the thread 5 at the tip of the nut member 2, and a tensile force f acts on the idling bolt member.
There was a problem that the screw threads were crushed due to this.

Therefore, an object of the present invention is to provide a screw-fastening type connector that solves the problems of the above-mentioned conventional technology, prevents over-tightening of the screws, facilitates the removal of the screws, and prevents damage to the screw threads. It is in.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a bolt member provided on one housing and having a threaded portion formed at the tip thereof, and a nut member provided on the other housing, which is connected to the housing by screwing together. In a screw fastening type connector that is formed so that force is applied so that the threaded part of the bolt member and the nut member are completed when the connection of the housing is completed, and the bolt member rotates idly, the threaded connection with the nut member is completed. The shape memory alloy is provided with a spring means in the other housing that comes into contact with the threaded end of the bolt member, and the spring means comes into contact with the bolt member in a normal temperature state and separates from the bolt member in a heated state. It was formed by

[Effect]

The spring means that comes into contact with the threaded end of the bolt member that has been threaded into the nut member is made of a shape memory alloy that comes into contact with the bolt member at room temperature and separates from the bolt member when heated. When the bolt member idles, frictional heat is generated at the surface contact portion between the bolt member and the spring means, and the spring means heated by this frictional heat is deformed so as to be separated from the bolt member. Therefore, the force that pushes up the bolt member so as to collide with the nut member becomes zero, and no force that would damage the screw thread is applied to the idling bolt member.

Further, after a certain period of time, the heated spring means returns to the normal temperature state, so it returns to its pre-deformed shape and comes into contact with the bolt member again, causing the bolt member that has finished connecting the housing to come into contact with the nut member. Then, the bolt member is held in a position where it can be re-screwed with the nut member.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the screw fastening type connector according to the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for parts that are the same as in the prior art.

In FIG. 1, reference numeral A indicates a female housing in which female terminals are formed, and B indicates a male housing in which male terminals are formed. The female housing A is provided with a bolt member 1 having a threaded portion 1a at its tip so as to be rotatable and detachable. Also, male housing B
A bolt hole 6 is formed in which the tip of the bolt member 1 enters when the housing is connected, and a nut member 2 is provided in the bolt hole 6 to be screwed into the threaded portion 1a of the bolt member 1. When the female housing A and the male housing B have been connected, the threaded engagement between the threaded portion 1a of the bolt member 1 and the nut member 2 is completed, and the bolt member 1 is configured to rotate idly. Further, the head 1b of the bolt member 1
A flange portion 7 is provided on the lower surface, and the movement force of the bolt member due to the screw engagement between the bolt member 1 and the nut member 2 is transmitted to the female housing A through the flange portion 7, and the female housing A is connected to the male housing A. It is adapted to be pressed toward housing B.

At the bottom of the bolt hole 6, as shown in FIG. 2, there is a bolt with one end 8a inserted and fixed into the male housing B and the other end 8b screwed into the nut member. A U-shaped spring piece 8 is provided that comes into contact with the tip of the threaded portion 1a of the member 1. This spring piece 8 is made of a shape memory alloy, and comes into contact with the bolt member 1 as described above at room temperature.
A force f is applied to the bolt member 1 so that the thread 4 at the rear end of the threaded portion 1a collides with the thread 5 at the tip of the nut member 2.
It's pushing up.

When the bolt member 1, which has been screwed into the nut member 2, idles for a while, frictional heat is generated at the surface contact portion between the bolt member 1 and the spring piece 8 (the end portion 8b of the spring piece), and this friction When the spring piece 8 is heated by heat and reaches, for example, 150°C, a temperature at which the resin forming the housing etc. does not melt, the spring piece 8 deforms.
As shown in FIG. 3, it is separated from the bolt member 1. In this way, the spring piece 8 is attached to the bolt member 1.
When the bolt member 1 is separated from the bolt member 1, the force f that was pushing up the bolt member 1 becomes zero. Therefore, no matter how much the bolt member 1 spins idly in this state, there is no force that pushes up the idling bolt member and causes the threads of the rear end of the threaded portion 1a and the tip of the nut member 2 to collide with each other, so that the threads will not be crushed or damaged.

Also, after a certain amount of time, the heated spring piece 8
returns to normal temperature, the spring piece 8 that had been deformed away from the bolt member 1 comes into contact again with the bolt member 1 that has finished connecting the housing, and the first
The state shown in the figure will be reached. Therefore, due to the force f pushing up the bolt member 1, the rear end of the threaded portion 1a collides with the tip of the nut member 2, and the bolt member and the nut member can be re-screwed together immediately, and the bolt member can be easily removed using a tool (not shown). It can be loosened and the female housing A can be easily separated from the male housing B.

The method of fixing the spring piece 8 is as shown in FIG. You can also do this.

[Effect of idea]

As is clear from the above description, according to the present invention, the other housing is provided with a spring means that comes into contact with the tip of the threaded portion of the bolt member that has been screwed into the nut member, and the spring means is installed at room temperature. Since it is made of a shape memory alloy that comes into contact with the bolt member and separates from the bolt member when heated, it is possible to prevent the bolt member from colliding with the nut member when the bolt member is idling and has finished threading with the nut member. No force is applied, and damage to the threads of the bolt member and nut member can be prevented.

Further, after a predetermined period of time, the spring means returns to a normal temperature state and comes into contact with the bolt member, so that the bolt member can be held in a position where it can be re-screwed with the nut member, and the bolt member can be easily loosened. Therefore, the housing can be easily removed.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an embodiment of the screw-clamp type connector according to the present invention, Fig. 2 is a perspective view showing the spring means used in the above embodiment, and Fig. 3 explains the operation of the above embodiment. FIG. 4 is a perspective view showing a modified example of the spring means, and FIGS. 5 and 6 are longitudinal sectional views showing a conventional screw-clamp type connector. A...Female housing, B...Male housing, 1
... Bolt member, 1a ... Threaded portion, 2 ... Nut member, 6 ... Bolt hole, 8 ... Spring means (spring piece).

Claims (1)

[Claims for Utility Model Registration] A bolt member provided on one housing and having a threaded portion formed at its tip and a nut member provided on the other housing are screwed together to provide a force for connecting to the housing, In a screw-clamp type connector that is formed so that the threaded part of the bolt member and the nut member complete the threaded engagement with the nut member when the housing is connected, the bolt member rotates idly. A spring means that comes into contact with the tip of the threaded portion is provided in the other housing, and the spring means is made of a shape memory alloy that comes into contact with the bolt member in a normal temperature state and separates from the bolt member in a heated state. A screw-tight connector featuring: