JPH0317410Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a board-in contact, more specifically, a core wire inside the board-in contact is attached to the tip of a connecting wire and is inserted into a through-hole of a printed circuit board through a soldering process. This invention relates to a board-in contact used to connect a predetermined electric circuit on a printed circuit board.

BACKGROUND TECHNOLOGY As shown in FIG. 5, a conventional single-pole board-in contact has two nib-like pieces 43 and 44 with the tip 42 of a board-in contact 41 interlocked, and each nib-like piece 43, 44 At the tips, there is a bulge 4
5, 46 are provided, and by the bulges 45, 46,
Alternatively, the tip 52 of the board-in contact 51 can be formed into a cylindrical shape as shown in FIG. 6, and the tip can be shaped like the tip of a hypodermic needle. The tip portion 5 is formed into a diagonally cut shape.
A lance 53 was formed in a protruding manner at the intermediate point between the two, and the lance 53 was configured as means for preventing slippage from a through hole (not shown) of the printed circuit board.

Problems to be solved by this invention The board-in contacts 41 and 51 are press-fitted into predetermined through-holes of a printed circuit board, and after the board-in contacts are press-fitted into the through-holes, the printed circuit board is subjected to a soldering process. The connection work between the core wires 48, 58 in the covered electric wires 47, 57 held by the respective board-in contacts 41, 51 and the predetermined electric circuits related to the through holes is completed, In the process of press-fitting the in-contacts 41 and 51 into the through-hole, it is necessary to apply a considerable pressing force to press-fit the board-in contact, and after press-fitting the in-contact into the through-hole, it is easy to come out of the through-hole. The overall length of the in-contact also required a considerable length, making it difficult to achieve smaller dimensions.

Means for Solving the Problems Therefore, this invention is an insertion piece at the tip of the board-in contact, and locking protrusions are provided on both sides near the base end of the insertion piece to lock the tip of the insertion piece. leg,
Preferably, the insertion piece is formed into two bifurcated locking legs, and the insertion piece is folded back at a substantially midway point between the locking protrusion and the locking leg to form a hook shape or a fishhook shape. It is an object of the present invention to provide a board-in contact consisting of the above-mentioned board-in contact, thereby solving the problems of the conventional board-in contact described above. .

Function In the board-in contact of this invention, since the shape of the insertion piece at the tip of the board-in contact is a simple hook shape, the insertion piece as a whole has excellent elasticity. The legs also have excellent elasticity because they simply protrude from the insertion piece main body, and when the tip of the folded part, which is the hook-shaped bottom of the insertion piece, is inserted into the through hole and the entire board-in contact is press-fitted into the through hole, the insertion piece main body In addition, since the locking protrusion and the locking leg are easily elastically contracted, they can be press-fitted into the through hole with only a very small pressing force. On the other hand, after the board-in contact is inserted into the through hole, each of the locking protrusions and locking legs elastically expands on the back side of the through hole, returns to its original state, and comes into contact with the back side of the through hole. Therefore, detachment of the board-in contact from the through hole is reliably prevented.

Embodiment Referring to FIG. 1, FIG. 2, FIG. 3, and FIG. 4 showing an embodiment of this invention, the board-in contact 1 of this invention crimply grips the wire sheath 2 on the base end side. It consists of a core wire crimping piece 5 that is crimped to the core wire 4 exposed from the wire sheathing 2 at approximately the middle of the covering gripping piece 3, and an insertion piece 6 on the tip side, and protrudes in the width direction on both sides near the base end of the insertion piece 6. The locking protrusions 7, 7 are provided with locking abutting parts 8, 8 on the proximal end side and tapered parts 9, 9 on the distal end side, and The tip of the insertion piece 6 is divided in both directions by an appropriate notch 10 in the center to form bifurcated locking legs 11, 11, and the insertion piece 6 is bent approximately in the middle to form a hook. The locking contact portions 8, 8 of the locking protrusions 7, 7 and the locking legs 11, 1 are formed into a curved shape or fishhook shape.
The locking abutting parts 12, 12 at the tip of the board-in contact 1 are arranged on the same cross section Y that intersects the central axis X of the board-in contact 1, and if desired, the above-mentioned bifurcated locking legs 11, 11 are formed in a shape that gradually widens left and right toward the distal end, and the locking protrusions 7, 7 are also formed in an arrangement bent downward by a small angle.

An overhanging piece 18 with a contact portion 17 on the tip side is formed by punching at an intermediate location between the covering gripping piece 3 and the core wire crimping piece 5.
prevents the board-in contact 1 from being over-inserted into the through hole and supports the board-in contact 1 in an appropriate arrangement.

In order to smoothly insert the board-in contact into the through-hole, it is also possible to appropriately grind the tip end corner of the core wire crimping piece 5 and form it into a chamfered portion 19.

Effects of the invention In the board-in contact of this invention, when the printed circuit board 13 is press-fitted into the through-hole 14, even the core wire crimping piece 5 can be inserted into the through-hole 14, so that no soldering occurs after the board-in contact is press-fitted into the through-hole. Through the process, a direct connection can be easily established between the substrate 13 and the crimp piece 5, and an ideal connection process can be achieved. In addition, in the board-in contact of this invention, the entire insertion piece 6 has moderate elasticity and is hook-shaped, and includes locking protrusions 7, 7, locking legs 11, 1.
1 are protruding pieces protruding from the main body of the insertion piece 6, so when the board-in contact is press-fitted into the through hole 14, the locking protrusions 7, 7, the locking legs 11, 11, and the board 13 front 1
5 and the through hole 14, the insertion piece 6, the locking protrusions 7, 7, and the locking legs 11, 11 each elastically contract and slide through the through hole 14, so that the board-in contact Through hole 1
4, it is possible to press-fit the board-in contact into the through-hole with only a very small pressing force; conversely, when the board-in contact is completely inserted into the through-hole, Insertion piece 6, each locking protrusion 7, 7, locking leg 1
1 and 11 expand due to their elasticity and return to their original states, and the locking abutting portions 8, 8 of each locking protrusion 7, 7 and the locking abutting portion of each locking leg 11, 11 By abutting and locking 12, 12 on the back surface 16 of the substrate 13, the board-in contact is reliably prevented from coming off from the through hole (see FIG. 2). In addition, when inserting the proposed board-in contact into the through hole,
The contact portion 17 of the overhanging piece 18 is connected to the front surface 1 of the board 13.
5 and prevents excessive insertion, it is possible to hold the board-in contact at an optimal position within the through hole and perform the soldering process. Furthermore, in the board-in contact of the present invention, the overall length of the board-in contact can be set small, and size reduction can be easily achieved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a board-in contact according to an embodiment of the invention, FIG. 2 is a partially cutaway side view showing the usage state of the embodiment of FIG. 1, and FIG. FIG. 4 is a developed view of the board-in contact shown in FIG. 1, and FIGS. 5 and 6 are partially cut-away perspective views of the conventional board-in contact. . Explanation of symbols, 1...Board-in contact, 2
...Wire covering, 3... Covering gripping piece, 4... Core wire,
5... Core wire crimping piece, 6... Insertion piece, 7... Locking protrusion, 8... Locking abutment part, 9... Taper part, 10
... Notch, 11 ... Locking leg, 12 ... Locking contact portion, 13 ... Printed circuit board, 14 ... Through hole, 15 ... Front surface, 16 ... Back surface, 17 ... Contact portion, 18 ... ... Overhanging piece, 19 ... Chamfered part, 41
... Board-in contact, 43, 44 ... Pen tip-like piece, 45, 46 ... Swelling part, 47 ... Covered electric wire, 48 ... Core wire, 51 ... Board-in contact, 52 ... Tip part, 53 ...Lance, 57...
Covered electric wire, 58... Core wire.

Claims (1)

[Scope of utility model registration request] A covering gripping piece that crimps and grips the wire covering, a core wire crimping piece that crimps the core wire exposed from the wire covering and inserts it into the through hole, and a core wire crimping piece that is provided on the tip side of the core wire crimping piece and inserts it through the through hole to hold the printed circuit board. It is a board-in contact consisting of an insertion piece that is fixed to the back side of the board and fixed to the printed circuit board by soldering, and the above insertion piece is fixed on both sides of the base end near the core wire crimping piece. By forming a hook-shaped elastic metal plate having a locking protrusion and a bifurcated locking leg at the tip thereof, the elastic metal plate is curved into a U-shape at the intermediate portion between the locking protrusion and the locking leg. When this insertion piece is press-fitted into the through hole, the diameters between the locking protrusions, between the locking legs, and between the locking protrusions and the locking legs are reduced, and the diameters are expanded on the back side of the printed circuit board. The locking protrusion and the locking leg are configured such that locking abutting portions formed on the end face side facing the core wire crimping piece are installed around the outer periphery of the through hole in a four-point supported state, A board-in contact that locks evenly.