JPH0525780U - Insulation bush - Google Patents

Abstract

(57) [Summary] [Purpose] Quickly attach the insulating bush to the metal case without using adhesive. A male insulator 8 having a flange 3 at one end of a cylindrical portion 2 and a recess 4 for mounting a lug terminal formed on the outer surface of the flange 3.
A locking piece 9 is provided so as to project from the inner surface of the collar portion 3. The locking piece 9 is provided at a position facing the peripheral wall cutout of the recess. The locking piece 9 is in the shape of a square rod extending parallel to the cylindrical portion 3 to the middle, and has a wedge-shaped locking claw 10 protruding outward at the tip. An engagement hole 12 corresponding to a locking piece is formed in a ring-shaped female insulator 11 that fits into the cylindrical portion of the male insulator 8. A hole for inserting the cylindrical portion and a small hole for inserting the locking piece are formed in the plate of the metal case. The male insulator is passed through the hole and the small hole from the inside of the metal case, and the inner surface of the flange is brought into contact with the plate. A female insulator is fitted to the male insulator outside the metal case and abutted on the plate body. The locking claw of the locking piece engages with the inner wall of the hard hole of the engagement hole.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention is a box-shaped noise filter that suppresses electromagnetic noise. In a connection terminal that is provided through the plate of a metal case of circuit components, the insulation that electrically insulates the plate and the terminal is provided. It concerns the structure of the bush.

[0002]

[Prior Art]

 A box-shaped noise filter in which a coil and a capacitor are placed in a box-shaped metal case to form a circuit and which is covered with a metal lid plate has a hole in the plate of the metal case in order to pull out the connection terminals from the metal case. Open, an insulating bush consisting of male and female insulators is attached, and the connecting terminal is passed through the center hole. As shown in the exploded perspective view of FIG. 3, the conventional insulating bush has a male insulator 1 provided with a circular crocodile part 3 at one end of a cylindrical part 2, and an outer surface of the crocodile part 3 having a peripheral wall for mounting a round lug terminal. A concave portion 4 having a partly cut out shape is formed, and a cylindrical portion is formed on the inner surface of the crocodile portion 3 at a position corresponding to the peripheral wall cutout 5 of the concave portion 4 as shown in FIG. In this embodiment, a rectangular protrusion 6 is formed on the outer peripheral surface of 2, and the female insulator 7 has a ring shape that fits into the cylindrical portion 2 and has an outer diameter larger than the outer diameter of the crocodile portion 3. In the case of a box-shaped noise filter, a hole provided with a notch corresponding to the rectangular protrusion 6 is formed on the side of the opening insulation of the side wall of the box-shaped metal case having an open upper surface. After applying the adhesive to the inner surface of the crocodile part 3, pass the cylindrical part 2 through the hole from the inside to the outside, fit the square protrusion 6 into the notch of the hole, and place the inner surface of the crocodile part 3 on the inner wall of the metal case. Abut. An adhesive is applied to one surface of the female insulator 7, and then the female insulator 7 is fitted into the cylindrical portion 2 protruding outside the metal case, and the applied surface is brought into contact with the outer wall of the metal case. In this way, male and female insulators were assembled and fixed across the side wall of the metal case.

[0003]

[Problems to be solved by the device]

 The conventional insulating bush described above needs to be fixed with an adhesive in order to assemble the plate body of the metal case by sandwiching it and to prevent the female insulator from rotating. The work of installing an insulating bush using an adhesive has a problem that the work efficiency is poor because the handling of the adhesive is troublesome and it takes time for the adhesive to solidify and fix.

[0004]

[Means for Solving the Problems]

 The male insulator is provided with a locking piece that extends from the inner surface of the crocodile part in parallel with the cylindrical part and has a locking claw at its tip. An engagement hole corresponding to this locking piece is formed in the female insulator.

That is, according to the present invention, a male insulator having a crocodile portion at one end of the cylindrical portion and a concave portion for mounting a lug terminal on the outer surface of the crocodile portion, and a ring fitted to the cylindrical portion of the male insulator are provided. In an insulating bush consisting of a female insulator of the shape of the male type, the inner surface of the crocodile part of the male insulator is provided with a locking piece that extends parallel to the surface of the cylindrical part and has a locking claw at the tip. The insulating bush is characterized in that the corresponding engaging hole is formed in the female insulator.

[0006]

[Action]

 The locking piece and the engaging hole are fitted to each other by sandwiching a plate body having a hole through which the cylindrical portion is passed and a small hole through which the locking piece is passed to assemble and hold the male and female insulators. The locking piece acts to prevent rotation of the insulating bush.

[0007]

【Example】

 FIG. 1 is an exploded perspective view showing an insulating bush according to the present invention. A male insulator 8 has a circular collar 3 with a recess 4 having a peripheral wall cutout 5 on the outer surface thereof for mounting a round lug terminal. A locking piece 9 extending in the axial direction of the cylindrical portion 2 up to the middle of the length is provided on the outer peripheral edge of the inner surface of the collar portion 3 facing the reference numeral 5. The locking piece 9 is in the shape of a square rod, and has a locking claw 10 protruding outward at the tip. The female insulator 11 has an outer diameter slightly larger than the outer diameter of the collar portion 3, can fit in the cylindrical portion 2, and has a ring shape having substantially the same length as the cylindrical portion 2, and has a male insulator on the end face. A square engagement hole (lateral hole) 12 that engages with the locking claw 10 of 8 is formed, and a square rigid hole 13 is formed on the outer peripheral surface so as to be connected to the engagement hole 12. The engagement hole 12 is located at a position where the inner wall on the outer peripheral side faces the outer surface of the locking piece 9, and the locking piece 9 can be loosely inserted, and has an inner size, which is almost the same depth as the length of the locking piece 9. The hard hole 13 has an inner size that allows the locking claw 10 to be loosely inserted. It is formed in consideration of the thickness of the plate. Because of the male and female insulators 8 and 11 having such a configuration, a hole through which the cylindrical portion 2 is inserted into the plate body 14 (shown by a chain double-dashed line in FIG. 1) of the box-shaped metal case having an upper opening. 15 and a square small hole 16 corresponding to the coupling hole 12 above it, and then the plate 14 is sandwiched between the locking piece 9 and the engaging hole 12 (the inner walls of the locking claw 10 and the hard hole 13). By engaging with, it can be assembled and fixed to the plate body 14 without an adhesive. FIG. 2 shows another embodiment of the present invention in use. In FIG. 2, the male insulator 8 is provided with locking pieces 9 at two locations, a location facing the peripheral wall cutout 5 of the recess 4 of the collar section 3 and a location symmetrical about the center. In FIG. 2, the former locking element 9 and the corresponding engaging holes 12 and hard holes 13 are shown without showing the former. Place the lug terminal 17 in the recess 4 by protruding the crimp connection from the peripheral wall cutout 5, insert the screw rod 18 into the center hole of the male insulator 8, insert the nut 19, washer 20, etc. The connection terminal is provided by tightening. The number of the locking pieces 9 may be determined in consideration of the shear strength of the insulating resin material and the cross-sectional dimension of the locking pieces so that the locking pieces 9 are not sheared by the tightening torque of the nut.

[0008]

[Effect of the device]

 As explained above, since it is an insulating bush that can be easily attached to the plate of the metal case, the remarkable effect that circuit parts such as a box-shaped noise filter can be manufactured at low cost with reduced man-hours. is there.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an insulating bush according to the present invention.

FIG. 2 is a partial cross-sectional side view showing another embodiment of the insulating bush according to the present invention in use.

FIG. 3 is an exploded perspective view showing a conventional insulating bush.

FIG. 4 is an external view showing the male insulator of FIG. 3 in another direction.

[Explanation of symbols]

 1,8 Male type insulator 2 Cylindrical part 3 Collar part 4 Recessed part 5 Circumferential wall cut out 6 Square protrusion 7 and 11 Female type insulator 9 Locking piece 10 Locking claw 12 Engaging hole (lateral hole) 13 Hard hole 14 Plate 15 holes 16 small holes 17 lug terminals 18 screw rods 19 nuts 20 washers

Claims (1)

[Scope of utility model registration request] 1. A male insulator having a crocodile part at one end of the cylindrical part, and a concave part for mounting a lug terminal formed on the outer surface of the crocodile part, and a ring-shaped female mold fitted to the cylindrical part of the male type insulator. In an insulating bush made of an insulator, a locking piece having a locking claw at the tip is provided on the inner surface of the crocodile part of the male insulator, the locking piece extending parallel to the surface of the cylindrical portion, and the engagement corresponding to the locking piece. Insulation bush with holes formed in female insulator.