JPS6020306Y2 - Contact locking structure - Google Patents

Description

[Detailed description of the invention] This invention is mainly based on a connector in which contacts are inserted and removed in the axial direction, and a part of the housing protrudes into the contact insertion hole, and the tip of the contact is extended into this and is bent between the U-shaped connections. The leaf spring contacts and deforms, and its restoring force pushes the contact toward the bottom of the contact insertion hole in the housing, keeping the protrusion formed on each surface engaged with the hole to prevent the contact from falling out of the housing. The present invention relates to a contact locking mechanism.

Conventionally, this type of contact has a female contact 1 having a locking spring 3 punched out near the contact portion 2, as shown in FIG.
enters the insertion hole 5 of the housing 4 and passes through it while deforming the locking spring 3, and the locking spring 3, which is released at the locking spring hole 6, returns to its original angle and locks the female contact 1 to the housing. However, since it is a small item, there are many unreasonable dimensions, for example, there is not enough clearance for punching out the locking spring 3, and due to friction etc., the deformation during the insertion process may not completely recover, or it may not be possible to completely restore the deformation during construction or transportation. Damage to the spring part was also likely to occur.

In addition, the one shown in FIG. 2 has a locking spring 1 on the housing 14 side.
3, but since the material is plastic, if the female contact is pulled in the direction of the cable 17 with strong force, there is a possibility that the locking spring itself will be destroyed.

This invention was made with the aim of improving the above-mentioned drawbacks of conventionally known contact locking methods.The locking mechanism of the locking spring and the contact are pressed against the housing to prevent the locking portion from coming off. This improves reliability by separating the spring mechanism.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Fig. 3 shows a female contact 21 of the present invention, and its tip end is S from the side.
2a and 22b, and a spring part 28 that is located between the contact pieces 22a and 22b whose extended bottom tips are bent in a U-shaped cross section in the direction of the cable 27 and whose ends face each other. be done.

FIG. 4 shows a housing 24, 25 is a female contact insertion hole, and 29 is a protrusion projecting from the lower part of the male contact (not shown) guide hole 39 in parallel to the insertion direction of the male contact.

FIG. 5 shows a cross section of the housing 24 in which the female contact of the present invention is inserted.

Reference numeral 23 denotes a protrusion protruded by punching out the bottom surface of the female contact 21, which engages with a hole 26 provided in the housing 24 and serves as a catch to prevent the female contact 21 from being pulled out in the direction of the cable 27.

The spring portion 28 formed between the contact portion 22 is brought into contact with and deformed by the protrusion 39 protruding from directly below the male contact guide hole 39, and its restoring force presses the female contact 21 against the bottom surface 30 of the insertion hole to close the protrusion 23 and the hole 26. This prevents them from becoming disengaged.

FIG. 6 shows the state immediately before engagement during the process of inserting the female contact 21 into the contact insertion hole 25, but unlike a conventional locking spring, the protrusion 23 is short and hardly deforms during the insertion process. No, the elastic deformation is caused by the above spring part 28.
It will be held in

The height of the locking portion of the female contact, including the tip of the spring portion 28 in the free state and the tip of the retaining projection 23, is at least as high as the protrusion 2 from the bottom surface 30 of the insertion hole of the housing into which this portion is inserted.
In practice, the spring strength is required to maintain the locking function against the maximum external force that the connector receives, and this depends on the material dimensions of each component. It is decided.

In this case, if the female contact 21 in the state shown in FIG. It won't go away until it's destroyed.

On the other hand, the spring portion 28 merely presses the female contact 21 onto the bottom surface 30 of the insertion hole so that the engagement between the protrusion 23 and the hole 26 does not come off. The spring portion 28 is not directly related to this, therefore, the spring portion 28 will not be deformed or damaged.

Further, the wall surface 33 of the hole 26 is the bottom surface J of the insertion hole as shown in FIG.

It is desirable to incline the angle θ so that it is an acute angle, so that even if the above force is applied, the female contact 21 is attracted toward the bottom surface 30 of the insertion hole, and the spring portion 28 is further The burden will be less.

As described above, according to the present invention, the locking protrusion does not need to take into account spring properties, can be made short and has increased strength, and the spring part is also free from force in the axial direction of the contact. First, since the wall surface of the protrusion of the housing is simply pressed, it will not be damaged by external force such as force in the direction of the cable, and since the spring part is formed inside the contact part of the female contact, it should be removed before inserting the contact into the housing. It has many advantages, such as almost no deformation during the process of transporting construction work, etc., and its effects are extremely large, along with improved reliability.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, as shown in FIG. Needless to say, it includes various things based on technical ideas.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams of a typical conventional housing and contact locking structure, Figure 3 is a perspective view of the contact of the present invention, Figure 4 is a sectional view of the insertion hole of the housing of the present invention, and Figure 5A is the locking structure of the contact. FIG. 5B is an AA sectional view of FIG. 5A, FIG. 6 is a longitudinal sectional view showing the contact and housing in a state on the verge of locking, and FIG. 7 is an assembled longitudinal sectional view of the invented contact and housing. FIG. 1.11,21...Female contact, 2,22.
...Contact part, 3. 13.23.36...
- Locking spring or protrusion, 4, 14.24...Housing, 5゜25...Contact insertion hole, 6
, 26, 35... Locking hole, 7, 27...
... Cable, 2B ... Spring part, 29 ...
...Protrusion, 39...Male contact guide hole.

Claims (1)

[Scope of utility model registration request] A female contact held in a housing and a female contact insertion hole provided in the housing has a contact portion consisting of a pair of contact pieces facing each other and standing substantially upright from the side surface of the female contact, and a projection or hole provided on the bottom surface of the female contact. a spring portion formed by extending and bending the tip of the bottom surface of the female contact into a U-shaped cross section and positioning the end portion between the opposing contact pieces; and a male contact at the bottom of the male contact guide hole of the housing. A hole or a protrusion is provided on the bottom surface of the female contact insertion hole of the female contact housing to engage the protrusion parallel to the insertion direction. Features a contact locking mechanism.