JPH0414855Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention has two spaced apart beams,
It relates to a holding member that holds another member therein when the other member is pushed in between.

The present invention can be applied, for example, to contacts (terminals) for electrical conductors, and can also be applied to removing insulation from contacts for insulated conductors. It also applies to others.

[Conventional technology]

For example, electrical conductor contacts and their isolation are well known. The contact generally has two spaced legs (beams),
If the conductor is pushed between them, it will warp outward. When a conductor is insulated, the insulation is crushed and removed or eliminated by cutting or scraping. To crush, the insulation is pushed between the conductor and the terminal,
It is then pushed off from the conductor. An example of such a terminal is described in US Pat. No. 3,112,147.
To cut, the insulated conductor is pressed down between two cutting blades extending perpendicular to the axis of the conductor.
In such terminals, the cutting blade cuts the insulation, which may then be deformed on the sides. One type of such terminal is described in US Pat. No. 3,027,536. For scraping, U.S. Patent No.
As described in No. 3,521,221, two parallel cuts are made through the insulation in a direction parallel to the axis of the conductor and the insulation is removed from a short length of conductor.

Also, JP-A-53-17991 and JP-A-49-64884
There is.

Furthermore, there is Japanese Patent Application Laid-Open No. 55-98484, which tightens the connector inward to ensure contact with the conductor of a so-called flat cable, and the protrusion of the connector does not curve outward. , which is in a different field from the present invention.

[The problem that the idea attempts to solve]

Terminals (contacts) of the type described above generally have legs (beams). Both beams act as cantilever beams and have generally parallel sides or tapers in one direction.
When a conductor is pushed down between the beams, these beams are stressed, but this stress is not uniformly distributed and is present at the base of the beam during insertion of the wire, even when the wire is placed in the terminal. be concentrated. These terminals have low specific volume efficiency, low elastic compliance and high wire insertion force. Also, with insulated conductors, such terminals are often effective for only one type or a limited number of types of insulation.

In view of the above-mentioned points, it is an object of the present invention to provide a holding member having a high degree of stress uniformity.

[Means to solve the problem]

To accomplish such objectives, the retaining member of the present invention includes a base and a pair of spaced apart cantilever beams each having substantially parallel inner edges extending from the base and defining a slot. It is equipped with

Here, each cantilever beam has an upper portion and a lower portion connected at the neck, and the outer edge of the lower portion of each cantilever beam tapers upwardly and inwardly from the base.

The outer edge of the upper portion of each cantilever beam is continuous with the lower portion and tapers upwardly and outwardly, and the upper portion has a top edge that is continuous with the inner edge by a radius. It is formed.

[Effect]

When the cylindrical member is pushed in, primarily the upper portion of the cantilever beam deflects outward due to pivoting at the neck portion. Furthermore, when the cylindrical member is pushed down between the lower portions of the beam, the lower portions of the beam deflect outwardly, and the cylindrical members are disposed in the lower portions of the beam.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment in which a holding member according to the present invention is used as a contact. In the figure, contact 10
has two beams 11, 12 extending upwardly from a base 13. Both beams 11 and 12 have parallel and opposing inner edges 14 separated by a predetermined distance, forming a slot 15. This predetermined distance is determined depending on the size (single or plural) of wires to be accommodated in the slot 15. At the outer edge of each beam there are two parts, a lower part 16a, 16b.
and upper portions 17a, 17b. The lower portions 16a, 16b slope upwardly and inwardly, and the upper portions 17a, 17b slope upwardly and outwardly. The lower part 16a and the upper part 17a or the lower part 16b and the upper part 17b are connected at a neck 18. Each beam has slot 15
It has upper or top edges 19 sloping upwardly and outwardly from the top, each edge 19 being joined to an associated inner edge 14 by a radius 20.

The beam thus has a lower part 11a, 12a and an upper part 11b, 12b, with a neck 18
forms the joint of those parts. Preferably, the neck 18 is below the joint of the inner edge 14 with the radius 20.

Figures 2, 3 and 4 illustrate several steps in inserting the conductor into the contact.

FIG. 2 shows an insulated conductor 25 having a conductor core 26 and an insulating layer 27 placed on the top edges 19 of both beams. When the conductor 25 is first pushed through the radius 20 and into the terminal, two things occur.
The upper portions 11b, 12b of the beams 11, 12 are deflected outwardly by the pivoting of the neck 18. at the same time,
The insulation of the conductor 25 is crushed and partially pushes out the conductor core 26. This state is shown in FIG. Here, a slight initial deformation of the conductor core 26 occurs and an insulating layer 27 (reference numeral 2) on the conductor core 26 occurs.
7a), further pushing the conductor past the location of the neck 18 removes the insulation and ends the deformation of the core, causing the conductor to move below the slot 15 between the lower portions 11a, 12b. Upper part 11
b, 12b are deflected outward by pivoting at the neck 18 during the stripping action of the insulation. In particular, when a large force is applied that exceeds the elastic limit of the material, the upper portions 11b, 12b permanently deform outward at the neck portion. On the other hand, the elastic deformation of the lower portions 11a, 12a is minimal. When a large force exceeding the elastic limit of the material is applied, as shown in Figure 4,
The upper part remains deformed and the angle between the tops of the opposing inner edges 14 is and the angle between the bottoms of the opposing sides is θ.

In this embodiment, the relatively high stress that occurs during insulation stripping at the inlet is widely distributed in the upper portions 11b, 12b, while the lower portions 11a, 12a are uniformly stressed to a lesser extent than the upper portions. In the taper of the lower portion, the beam has improved specific volumetric efficiency and increased elastic compliance.
The lower, less stressed portions of both beams provide the desired wire rest point properties.
I will provide a. The contact 10 achieves conductor insertion with lower insertion force than conventional designs and provides effective insulation stripping while providing adequate contact force to ensure a hermetic connection and complete conductor retention.

The contact 10 of this embodiment is double-acting and has a cantilevered double-tapered beam that deflects independently, unlike conventional contacts (terminals) with a more uniform or single tapered beam that have been used up to now. are doing. Double-acting beams provide effective insulation stripping at low wire insertion forces without sacrificing line rest point compliance, whereas traditional designs provide effective insulation stripping with the same or lower rest point compliance. High insertion forces occur during peeling. In this embodiment, it is possible to use an optimally tapered beam with a more evenly distributed core force. This gives increased elastic compliance compared to traditional terminals, when the planar ends of each beam are normally acting at lower stresses than the base of the beam, and allows for a significantly greater permanent fixation within the beam. Do this. This contact 10 is manufactured by punching to be robust and inexpensive. With improved stress distribution, thinner materials and overall compactness can be obtained.

5, 6 and 7 each show another embodiment of the present invention. Although FIG. 1 shows a single contact, the present invention can also provide multiple contacts. FIG. 5 shows a back-to-back configuration with beams 11, 12 extending from opposite sides of a common base 13. FIG. FIG. 6 shows a stripping device in which two or three contacts are formed from a long strip having a long base 13. FIG. 7 shows a double contact, the bases 13 being common to the interconnecting webs 30.

As mentioned above, the contacts can be designed specifically for each conductor size, but if desired,
The range of wire sizes can be accommodated by special sizes of the contacts. In Figure 8, Figure 1,
As shown in Figures 2, 3, and 4, American wire diameter gauges (AGW22 (approx. 0.643 mm), AGW24 (approx.
0.511mm) and AGW26 (approximately 0.404mm), contacts are shown to accommodate telephone line conductors. The various dimensions shown and noted below, for each conductor, are approximate and subject to change. Thus, although the angle λ may vary as well as the radius r, the particular dimensions and values given are particularly suitable for telephone conductors having copper conductors of a given gauge. All commonly used insulating materials can be stripped, such as paper pulp, plastics, foams, foam skins, etc.

Below are the special dimensions and values for FIG.

a = 0.1 inch (approx. 2.54 mm) b = 0.07 inch (approx. 1.78 mm) c = 0.09 inch (approx. 2.28 mm) d = 0.07 inch (approx. 1.78 mm) e = 0.05 inch (approx. 1.27 mm) f = 0.01 inch ( (approximately 0.254mm) r = 0.02 inch (approximately 0.508mm) λ = 120° As mentioned above, the position of net 18 is R 20
The static point of the conducting wire core 26 is preferably below the neck 18. The angle λ and the radius r affect the initial insertion force and the force applied to the insulation. The slot width f, radius r and dimensions (a-b) determine the amount of deformation of the conductor core 26 and the amount of bending or spreading of both beams 11,12. Further, the bending (spreading) of both beams 11 and 12 is determined by the size of the conducting wire. A typical material is phosphor bronze about 0.12 inches (about 0.3 mm) thick.

The double acting beam minimizes cutting or other metal and reduces the strength of the conductor after insertion into the contacts. This is true even when very thin materials are used for the contacts.

In addition, although detailed instructions are given for using insulated conductor wires,
This contact can be used with bare conductors. Without insulation, beam deformation is reduced, but slot 1
A similar situation occurs with conductor deformations that occur before entering 5. Similar structures can be used to hold small diameter rods or "wires" of other materials than metal, and depending on the application, it is also possible to make the holding members of non-metallic materials.

[Effect of idea]

As detailed above, according to the present invention, the pair of cantilever beams is double-acting, and when a member is inserted between the beams, the stress is uniformly distributed.
Also, the reliability of member retention by the lower portion of the beam is increased.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a specific example of a contact point to which the present invention is applied. FIGS. 2, 3 and 4 are illustrations showing the successive steps in inserting a conductor into the contact shown in FIG. FIG. 5, FIG. 6, and FIG. 7 are perspective views showing other specific examples of contacts, respectively. FIG. 8 is an explanatory diagram showing the main dimensions of the contact point in FIG. 1. In the figure, 10 is a contact, 11 and 12 are beams, 11a and 12a are lower parts, 11b and 12b
is the upper part, 13 is the base, 14 is the inner edge, 15
is the slot, 18 is the neck, 19 is the top edge, 25
is an insulated conductor.

Claims (1)

[Claims for Utility Model Registration] A base; a pair of spaced apart cantilever beams extending from the base and facing each other so as to each have substantially parallel inner edges forming slots; each cantilever beam has an upper portion and a lower portion connected at the neck, an outer edge of the lower portion of each cantilever beam tapering upwardly and inwardly from the base; The outer edge of the upper portion of the beam is continuous with the lower portion and is tapered upwardly and outwardly, and the upper portion has a top edge that is continuous with the inner edge by a radius. When the cylindrical member is pushed in from the top edges of both upper parts, at least the upper part is warped outward due to the rotation at the neck part, and when the cylindrical member is further pressed, each of the above parts is bent. A holding member characterized in that the lower portion of the cantilever beam is deflected outward so that the cylindrical member is disposed in the slot.