JPS6017805Y2 - Assembling device for inner sleeve terminal piece in power plug - Google Patents

Description

[Detailed description of the invention] The present invention provides an insulating cylinder made of synthetic resin inside the outer sleeve, and assembles and holds the inner sleeve in the inner cavity of the insulating cylinder. Improvements in the means for assembling the terminal piece of the inner sleeve in a power plug configured by installing a terminal piece at the rear end for connecting the inner sleeve and the outer sleeve to the cord wire. Regarding.

The above-mentioned power plug has a terminal piece on the rear end of the insulating cylinder installed inside the outer sleeve for connecting the inner sleeve held in the inner cavity of the insulating cylinder to the cord wire. It is assembled so that it protrudes backward, but after the cord wire is connected to the assembled terminal piece by soldering, it is molded with a synthetic resin material to cover the outer periphery of the connection part, so the molding At the time of assembly, the synthetic resin material must be assembled so as not to leak into the inner pole sleeve, making this assembly troublesome.

As a means to facilitate this assembly, a slit-shaped through hole through which the inner sleeve terminal piece passes is provided in the plug that closes the opening opened at the rear end of the insulating cylinder made of synthetic resin material. Alternatively, a notch-shaped groove into which the terminal piece fits is formed around the periphery of the stopper, and the terminal piece is held in the through hole and the terminal piece is inserted into the opening. A method is known in which the terminal piece is held between the inner circumferential surface of the mouth and the terminal piece is made to protrude rearward. If the terminal piece and the terminal piece fit tightly together, there is a problem that the terminal piece may be strained and deformed when the terminal piece is inserted into the through hole. It is difficult to ensure that the pressure contact between the surface and the inner peripheral surface of the opening, the pressure contact between the terminal piece and the plug in the groove, and the pressure contact between the terminal piece and the inner peripheral surface of the opening are performed at the same pressure. In this case, the pressure contact on either side becomes insufficient and the synthetic resin material leaks, and when the plug body is inserted into the open opening, the terminal piece may move in the circumferential direction. There is a problem in that this causes distortion in the synthetic resin material and causes significant leakage of the synthetic resin material.

The present invention solves these problems and allows the inner sleeve terminal piece to be easily assembled without straining the terminal piece, and also prevents the synthetic resin material from leaking during molding. The purpose of this is to propose new means to prevent this from occurring.

The means of the present invention for this purpose includes forming a rear end portion protruding rearward from the outer pole sleeve on the rear end side of an insulating cylinder made of a synthetic resin material, which is installed in the inner cavity of the outer pole sleeve; An engagement groove is formed in the rear end, which is perpendicular to the axial direction and crosses the rear end from left to right, and the inner pole sleeve is fitted into the longitudinal center of the bottom of the engagement groove. An open opening on the rear end side of the shaft hole is formed into a square hole whose upper and lower inner wall surfaces are continuous with the groove wall of the engagement groove, and from the open opening, the inner pole sleeve fitted in the axial direction is opened. A tongue-shaped inner sleeve terminal piece installed at the rear end protrudes rearward along one of the upper and lower inner wall surfaces of the opening and the groove wall of the engagement groove continuous thereto. At the same time, the open opening has a prismatic part on the front half that fits into the opening, and a second prismatic part that is elongated from side to side on the rear side and fits in the engagement groove, and is connected to each wall surface above and below the prismatic part. Second
It is characterized in that an insertion plug made of a synthetic resin material formed so as to be continuous with each of the upper and lower wall surfaces of the prismatic portion is press-fitted.

Next, embodiments will be described in detail based on the drawings.

In Fig. 1, 1 is the insulating cylinder of the power plug A, which is made of synthetic resin and has a cylindrical bottom shape, and an outer sleeve 2 made of metal is attached to the outer circumference of the insulating cylinder (Fig. 3). .

The outer electrode sleeve 2 is assembled to the insulating cylinder 1 by setting the outer electrode sleeve 2 in a mold (not shown) and pouring molten insulating material (synthetic resin material) into the mold. This is done by shaping the bottom of the insulating cylinder 1 integrally with the outer pole sleeve 2, and during molding, the front end 1a and rear end 1b of the insulating cylinder 1 are aligned with the front end side of the outer pole sleeve 2 and the rear end 1b of the insulating cylinder 1. It is molded so that it is exposed on the rear end side.

A shaft hole 4 is formed in the insulating cylindrical body 1 during the molding process, and the shaft hole 4 passes through the inner cavity of the insulating cylinder 1 in the axial direction.

The shaft hole 4 is formed into a rectangular hole with a prismatic cross section, except for the part located at the front end 1a, and the part located at the front end 1a has an insertion port 40 into which the inner pole of the mating connection part is inserted. It is formed into a round hole with a cylindrical cross section, and at the boundary position between the cylindrical round hole that will be the insertion opening 40 and the square hole, there is a droplet that extends toward the square hole. A retaining stepped portion 10 is provided.

Further, in the rear end portion 1b of the insulating cylinder 1, a notch-shaped engagement groove 42 having a width that is aligned with the diameter of the square shaft hole 4 is provided in the rear end portion 1b, perpendicular to the axial direction. It is formed so that the center portion in the longitudinal direction overlaps with the rear end portion of the shaft hole 4, so that the rear end portion 1b of the insulating cylindrical body 1 has a
A notch-shaped engagement groove 42 cut forward from the rear end surface side is formed so as to be orthogonal to the axial direction and cross the rear end portion 1b from side to side, and the center of the engagement groove 42 in the longitudinal direction The opening 41 on the rear end side of the shaft hole 4 connects the upper and lower inner wall surfaces 41a, 41a to the groove walls 42b, 42b of the engagement groove 42.
The groove bottom 42a of the engagement groove 42 is formed in the shape of a rectangular hole continuous with the groove, and is opened on both the left and right sides of the opening 41.
, 42a are positioned (FIG. 9).

Reference numeral 3 denotes an outer sleeve terminal piece provided on the rear end side of the outer pole sleeve 2. A metal strip material is press-molded to form an eyelet portion 30 on the base end side, and the eyelet portion 30 is attached to the outer pole sleeve 2. on the outer periphery of the front end side of the outer pole sleeve 2 (left end side in Figure 4)
It is provided on the rear end side of the outer pole sleeve 2 by forcibly fitting it in and positioning it on the rear end side of the outer pole sleeve 2.

Reference numeral 5 designates an inner sleeve, and a cylindrical portion 51 is formed by rolling a metal plate into a cylindrical shape, opening an axially long window hole 50 in the circumferential wall, and forming the bottom of the circumferential wall in a conical shape so as to be expandable and contractible. and,
The inner sleeve terminal piece 52 extends from the rear end of the cylindrical part 51 in the form of a strip, and when the cylindrical part 51 is in the front end side, the opening 41 on the rear end side of the shaft hole 4 is opened. The front end of the cylindrical portion 51 is inserted into the shaft hole 4, and the front end of the cylindrical portion 51 is inserted into the insertion port 4.
0, the inner sleeve terminal piece 52 moves outward along the inner wall surface 41a above the rear opening 41 and the wall surface above the engagement groove 42 ( Fourth
It is inserted so that it protrudes to the right side of the figure.

6 is the inner sleeve terminal piece 52 of the inner sleeve 5,
It is an insertion plug for closing the opening 41 on the rear end side in a state of protruding rearward from the opening 41 on the rear end side of the shaft hole 4.

The insertion plug 6 is made of a synthetic resin material, and has a square column part 60 on the front side that fits into the square tube-shaped shaft hole 4, a columnar guide part 61 protruding from the front end, and a rear side that fits in the square columnar shaft hole 4. Matching groove 42
It has a rectangular shape that is long in the left and right directions (up and down in FIG. 7) so that it fits tightly into the engagement groove 42, and its upper and lower widths are the same or slightly wider than the groove width of the engagement groove 42. The second prismatic portion 62 is shaped like this, and the guide portion 6
The open opening 4 on the rear end side of the shaft hole 4, with the front end side where 1 is located first.
1, the square column part 60 fits into the shaft hole 4.
Inside, the second prismatic portion 62 is press-fitted into the engagement groove 42.

Note that 11 is a chamfer formed on the rear end 1b of the insulating cylinder 1, and by bending the outer sleeve terminal piece 3 along the chamfer 11, the outer sleeve terminal piece 3 is made parallel to the inner sleeve terminal piece 52. It is possible to do so.

The device for attaching the inner sleeve terminal piece to the power plug according to the present invention, constructed as described above, operates as follows.

The inner sleeve terminal piece 52 provided at the rear end of the inner sleeve 5 to be fitted into the shaft hole 4 of the insulating cylinder 1 is fitted into the square hole-shaped opening 41 on the rear end side of the shaft hole 4. The square column part 60 of the insertion plug 6
As a result, the wall surface on the upper surface side of the prismatic section 60 and the inner wall surface 41a on the upper surface side of the opening 41 are strongly compressed and held, and the wall surface on the lower surface side of the prismatic section 60 and the inner wall surface 41a on the upper surface side of the opening 41 are held tightly. It is strongly pressed against the inner wall surface 41a on the lower surface side with the same pressure.

Although the left and right wall surfaces of the prismatic portion 60 and the left and right inner wall surfaces of the opening 41 do not come into close contact with each other with the same pressure,
The upper and lower wall surfaces of the second prismatic portion 62 which is long on the left and right on the rear half side of the insertion plug 6 and which are continuous with the upper and lower walls of the prismatic portion 60 and the open opening 41
Upper and lower groove walls 42b of the engagement groove 42 are continuous with the upper and lower inner wall surfaces 41a, 41a.

42b will fit and close with the same pressure,
The fitting portions between the left and right wall surfaces of the prismatic portion 60 and the left and right inner wall surfaces of the opening 41 are also tightly closed.

In addition, the second prismatic portion 62 of the insertion plug 6 is fitted into the left and right long engagement grooves 42, thereby regulating the fitting between the prismatic portion 60 and the opening 41 in the correct state, and ensuring that the fitting is correct. This prevents misalignment from occurring when the

The inner sleeve terminal piece 52 can be firmly assembled and maintained simply by press-fitting the insertion plug 6 into the opening 41.

Therefore, according to the means of the present invention, the inner sleeve terminal piece can be
It becomes possible to assemble the synthetic resin material by a simple operation without causing any stress and without causing any leakage of the synthetic resin material during molding.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of a power plug embodying this invention, Figures 3, 4, and 5 are cutaway side views showing the assembly process, and Figure 6 is the IV-IV of Figure 3. FIG. 7 is a perspective view of the plug, FIG. 8 is a perspective view of the entire body connected to an adapter plug, and FIG. 9 is a perspective view of the rear end of the insulating cylinder. Explanation of drawing symbols, A...power plug, 1...insulating cylinder,
1a...front end, 1b...rear end, 10...engaging step part,
11... Chamfered part, 2... Outer pole sleeve, 3... Outer pole sleeve terminal piece, 30... Eyelet part, 4... Shaft hole, 40...
・Insertion port, 41・・Opening port, 41a・・Inner wall surface, 42・
- Engagement groove, 42a...Groove bottom, 42b...Groove wall, 5...Inner pole sleeve, 50...Window hole, 51...Cylindrical part, 52...
Inner pole sleeve terminal piece, 6... Insertion plug, 60... Square column part,
61...Guide part, 62...Second prism part, 8...Adapter.

Claims (1)

[Scope of utility model registration request] A rear end portion 1b that protrudes rearward from the outer pole sleeve 2 is formed on the rear end side of the insulating cylinder 1 made of a synthetic resin material and installed in the inner cavity of the outer pole sleeve 2. , a shaft in which an engaging groove 42 is formed that is orthogonal to the axial direction and crosses the rear end portion 1b from side to side, and the inner pole sleeve 5 is fitted into the central portion of the groove bottom of the engaging groove 42 in the longitudinal direction. Opening port 4 on the rear end side of hole 4
1 is formed into a rectangular hole shape in which the upper and lower inner wall surfaces 41a, 41a are continuous with the groove walls 42b, 42b of the engagement groove 42,
A tongue-shaped inner pole sleeve terminal piece 52 is installed from the opening 41 to the rear end of the inner pole sleeve 5 fitted in the shaft hole 4.
, one inner wall surface 41a of the upper and lower inner wall surfaces 41a, 41a of this opening 41 and the engagement groove 42 continuous thereto.
The opening 41 has a rectangular column part 60 that fits into the opening 41 on the front side, and a second horizontally long second part that fits in the engagement groove 42 on the rear side. An insertion plug 6 made of a synthetic resin material is press-fitted to form a prismatic portion 62 and formed such that the upper and lower wall surfaces of the prismatic portion 60 and the upper and lower wall surfaces of the second prismatic portion 62 are continuous, respectively. Assembling device for inner sleeve terminal piece in power plug.