JPH0216524Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to a cylindrical contact.

"Prior Art" A cylindrical contact is used in which a pin contact on the other side is inserted into the inside of the cylindrical contact, and the cylindrical contact and the pin contact on the other side come into elastic contact to establish an electrical connection between the two. It is being

The configurations shown in FIGS. 2A, B to 4 are of this type of conventionally used cylindrical contacts.
1 is formed. This cylindrical contact 11 is formed in a shape whose diameter is narrowed toward the center position in the longitudinal direction. In other words, the inner diameter is 2R at both ends in the longitudinal direction.
The inner diameter of the cylindrical contact 11 at the central position in the longitudinal direction is narrowed to 2r (R>r). Figure 2B
In this example, the inner diameter of the cylindrical contact 11 is set to 2r in the narrow region l in the axial direction near the center position. The cylindrical contact 11 has a shape in which the inner diameter decreases linearly from both ends to a narrow portion having an inner diameter 2r.

At the ridge of the cylindrical square column of the cylindrical contact 11,
Cut grooves 13-1 to 13-4 are formed over substantially the entire length except for both ends in the longitudinal direction. The cylindrical contact 11 is divided into a plurality of plates 14 to 17 along the axis by the grooves 13-1 to 13-4.

A mating contact 20 is inserted and fitted into the cylindrical contact 11 as shown in FIG.
The inner diameter of the mating contact 20 (in the example shown in FIG. 4, the length of one side of the square prism-shaped mating contact) is set to be slightly smaller than the inner diameter R ₀ at both ends of the cylindrical contact 11.

Therefore, the mating contact 20 inserted into the cylindrical contact 11 elastically biases the plates 14 to 17 radially outward within the cylindrical contact 11 against the biasing force thereof.

The plates 14 to 17 that have been moved against the biasing force elastically press the peripheral surface of the mating contact 20 inserted into the cylindrical contact 11, so that the mating contact 20 and the cylindrical contact 11 are mutually connected. and the two are electrically connected.

In this conventionally used cylindrical contact 11, each of the plates 14 to 17 is formed into a substantially trapezoidal shape from both ends to a central position in the longitudinal direction of the cylindrical contact 11. Further, at the narrowed central portion of the trapezoid's base, the trapezoids from both ends are connected to form a continuous shape. Therefore, the plates 14 to 17 are the cylindrical contacts 11
At the center position in the longitudinal direction, the width corresponding to the base mentioned above is the minimum value ω.

In the cylindrical contact 11, it is necessary that the mating contact 20 inserted into the cylindrical contact 11 makes reliable elastic contact with the cylindrical contact 11.

On the other hand, plates 14 to 17 are formed of an elastic material so that the width is narrowed from both ends of the cylindrical contact 11 to the center position of the cylindrical contact 11.
However, the width of the kerfs 13-1 to 13-4 must be set to a predetermined value or more so that adjacent ones do not come into contact with each other at the center position.

From these points, the width ω of the plates 14 to 17 at the center portion of the cylindrical contact 11 is limited, and cannot be made sufficiently wide.

When the mating contact 20 is inserted into the cylindrical contact 11, each of the plates 14 to 17 has a
A relatively large stress is applied by the inserted mating contact 20 at both end positions and the central position in the longitudinal direction of the cylindrical contact 11 . As described above, the width of each of the plates 14 to 17 is the minimum value ω at the center position in the longitudinal direction. For this purpose, at the center portion of the cylindrical contact 11 in the longitudinal direction, the plate 14 is
-17, permanent deformation is likely to occur.

In particular, when trying to downsize the cylindrical contact 11 as a whole, the width of the plates 14 to 17 at the central position in the longitudinal direction of the cylindrical contact 11 becomes correspondingly smaller, creating a shape that can store elastic energy. It becomes difficult to contact the other party 20
It becomes easy to be permanently deformed by inserting the .

``Problems to be solved by the invention'' This invention solves the problems with the previously used cylindrical contacts, is resistant to permanent deformation when a mating contact is inserted, and has sufficient elastic energy even when miniaturized. The present invention provides a cylindrical contact that can have a shape that allows storage of

"Structure of the invention" In this invention, a cylindrical contact with a polygonal cross section is formed of a conductive material, and the diameter of this contact is narrowed toward the center position in the longitudinal direction. A mating contact is inserted into this cylindrical contact, the cylindrical contact and the mating contact come into elastic contact, and electrical connection is established between the mating contact and the cylindrical contact.

A kerf is formed in a polygonal ridge portion of the cylindrical contact along the axis, and the kerf divides the contact into a plurality of plates along the axis. In this invention, the plurality of plates are extended along one direction of rotation about the axis so that one side edge of the plate is located outside the inner surface of the adjacent plate. An extension is formed.

"Example" Hereinafter, this invention will be described in detail based on an example using the drawings.

FIGS. 1A, B and 5 show the configuration of an embodiment of the cylindrical contact of this invention. Extensions 25 to 28 are formed on the cylindrical contact.

That is, in this invention, a plurality of plate bodies 14 are divided along the axis by grooves 13-1 to 13-4 formed at polygonal ridges along the axis.
-17, extensions 25-28 are formed, respectively.

Formation of these extensions 25-28 is performed as follows.

One side edge of each of the plates 14 to 17 is adjacent to each other along one direction of rotation about the axis of the cylindrical contact 11, in the clockwise direction shown by the arrow θ in FIG. It is extended so as to be located outside the inner surface of the plate body, and extension parts 25 to 28 are formed in this extension part.

In the embodiment, one side edge of each of the plates 14 to 17 is formed to extend linearly from both ends of the cylindrical contact 11. One linear side edge of each of the plates 14 to 17 is connected to the kerf 13- of the adjacent plate.
It is located on the other side edge formed in an inclined straight line along lines 1 to 13-4 and outside the inner surface of the plate surface.

That is, in this state, one straight side edge of each plate is extended so as to be located outside the inner surface of the adjacent plate, and each plate has extensions 25 to 2.
8 will be formed.

Therefore, in this invention, the cylindrical contact 1
The width ω ₀ of the narrowest part of the plates 14 to 17 at the center portion of the contact plate 1 is wider than that of a conventionally used cylindrical contact by this extension. That is, in comparing FIG. 1B and FIG. 2B, both cylindrical contacts have the same length in the axial direction, and the inner diameter of both ends is R=
Even if they are made with the same diameter, the cylindrical contact of this invention is wider at the narrowest part in the center of the cylindrical contact, so that ω ₀ > ω exists between the _two . There is a relationship.

Therefore, in this design, even if the cylindrical contact is made small, the narrowest part is wider than the conventional one, so the contact force obtained by inserting the mating contact is greater by this extension. As a result, the elastic bias force of each plate increases,
Even if the entire device is miniaturized, it can store a large amount of elastic energy and will not be permanently deformed by inserting a mating contact. Therefore, it is possible to downsize the entire cylindrical contact, have a long service life, and ensure electrical connection with the other contact.

The configuration shown in FIG. 7 is one example of a device using the cylindrical contact of this invention.
7 is extended in the axial direction, and a terminal 37 is integrally formed. The terminals 37 are inserted into mounting holes 38 - 1 and 39 - 1 formed in the circuit board 35 , respectively, and connected to predetermined positions of the circuit on the circuit board 35 .

On the other hand, mating contacts (not shown) to be inserted into the cylindrical contacts 11 are inserted into the respective housing openings 40-1, 40-2, . . . and 41-1, 4.
1-2, . . . is provided with a plug body 36 housed within. This plug body 36 is attached to the cylindrical contact 11 attached to the circuit board 35 from the other end side.

In the embodiments, the cylindrical contact has a cylindrical quadrangular prism shape, but various shapes such as a cylindrical hexagonal prism, a cylindrical octagonal prism, etc. can be used. In addition, in the embodiment, one side edge where the extension part of the plate is formed is formed in a straight line, but only at the central position of the plate, the plate is wider than the inner surface of the adjacent plate. It is also possible to have a configuration in which it is extended outwardly and an extension is formed.

Further, in the embodiment, the plate is composed of an inclined plane plate, but it is also possible to have a structure in which the plate has a curved surface with curvature.

"Effects of the invention" As explained in detail above, this invention allows for elastic deformation by accumulating a large amount of elastic energy without causing permanent deformation upon insertion of the mating contact. It is possible to provide a cylindrical contact which allows reliable and strong connection and whose overall shape can be significantly reduced.

[Brief explanation of the drawing]

FIGS. 1A and 1B show the configuration of an embodiment of the cylindrical contact of this invention, a side view and a front view, respectively. FIGS. 2A and 2B show the configuration of a conventionally used cylindrical contact. 3 is a sectional view taken along line A-A in FIG. 2B, and FIG. 4 is a side view and a front view of the cylindrical contact, respectively, and FIG. A cross-sectional view, Figure 5 is a cross-sectional view taken along line A-A in Figure 1B, and Figure 6 is a cross-sectional view.
The figure is a sectional view at the longitudinal center position of the cylindrical contact of this invention and the mating contact when they are fitted together, and FIG. 7 shows an example of the configuration of a device using the cylindrical contact of this invention. FIG. 11: Cylindrical contact, 13-1 to 13-4:
Cut groove, 14-17: plate body, 20: mating contact, 25-28: extension part.

Claims (1)

[Scope of utility model registration request] A cylindrical contact with a polygonal cross section is formed of a conductive material, the diameter of this contact is narrowed toward the center position in the longitudinal direction, and a mating contact is inserted into the cylindrical contact. In a cylindrical contact in which a cylindrical contact and the counterpart contact are in elastic contact to establish an electrical connection between the two, the cylindrical contact has a kerf formed at a polygonal ridge along an axis. , the contact is divided into a plurality of plates along the axis by this kerf, and each of these plates has one side edge of the plate along one direction of rotation about the axis. A cylindrical contact characterized in that an extension part is formed such that the extension part is located outside the inner surface of an adjacent plate body.