JPH0723880Y2 - Fixed contact device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fixed contactor device such as an electromagnetic contactor or an electromagnetic relay in which a bridge-type contactor is adopted.

[Conventional technology]

Known as this type of fixed contact device is a front view and a longitudinal cross-sectional view of a main portion of FIGS. 12 and 13. Although only one side is shown in the drawing, the fixed contactor device has a fixed contactor assembly 10 (only one is shown in the figure), which is opposed to the fixed contactor device and has a pair of two. The sub-assembly 10 is attached to the mounting base of the insulating case 1 (see FIG. 1). The mounting base 3 is a pedestal 1c provided on the partition walls 1a and 1b that partition the poles of the insulating case 1.
2a, 2b perpendicular to the plane of the contact and the contact piece 1 provided on the pedestal 1c
Relief groove 2c of protrusion 3h of 3 and screw of fixed contact assembly
Eleven escape holes 2d are provided. Since the fixed contactor assembly 10 has the same structure with two as a pair as described above, it will be described with reference to one of them, it is composed of the above-mentioned screw 11, washer 12 and contactor piece 13. Insulation case 1 for contact piece 13
The fixed contact 14 for normal opening is fixed to the contact base 13a inserted in the arc extinguishing chamber 1d by brazing or the like, and the width of the terminal portion 13b located on the base 1c is the dimension between the grooves 2a and 2b. It is formed in a rectangular shape having a width slightly smaller than W. Also the terminal part
13b has four engaging projections 13c at four corners extruded to be slightly higher than the groove width W1 of the grooves 2a and 2b, and screw holes (not shown) are provided at positions corresponding to the escape holes 2d. Has been. Then, attach the contact piece 13 to the mounting base first.
Pushing into the grooves 2a, 2b in the direction indicated by the arrow P in FIG.
Hold it on and then screw it through the washer 12 into the screw hole 13d 1
The installation is completed by screwing in 1.

[Problems to be solved by the invention]

In such a conventional device, the grooves 2a, 2b of the contact piece 13 are
When pushing into the groove, the corners of the engaging protrusion 13c on the tip side
It will be press-fitted while scraping the upper sides 2a1, 2b1 of the upper side 2a of the grooves 2a, 2b by the reaction force of the bending of the locking projection 13c.
There is a defect that the chips 1 and 2b1 may be chipped and these shavings may adhere to the contact surface of the fixed contact 14 to cause poor contact. Further, since the groove 2c on the pedestal 1c is open to the arc extinguishing chamber 1d, foreign matter may enter from the outside, which may cause a trouble.

As a measure to prevent chipping of the upper sides 2a1, 2b1 of the grooves 2a, 2b, it is conceivable to make the grooves 2a, 2b deeper to increase the area for receiving the reaction force of the locking projection 13c, but generally the thickness of the partition walls 1a, 1b. Since the depths of the grooves 2a, 2b are deep, the partition walls 1a, 1b may become particularly thin and the partition walls 1a, 1b may be damaged during wiring work, and the depth of the grooves 2a, 2b is increased. It is not possible.

The purpose of this invention is to eliminate the above-mentioned conventional drawbacks, reduce the reliability of holding in the mounted state, eliminate the risk of scraping or chipping of the mounting structure during press fitting, and prevent foreign matter from entering from the outside. It is an object of the present invention to provide a fixed contact device in which contact failure due to these is eliminated.

[Means for solving problems]

In order to achieve the above-mentioned object, this invention is inserted by press-fitting from both ends toward a central arc-extinguishing chamber on a pedestal that divides the poles of an insulating case with partition walls, and fixed contacts are provided on the opposite side on the opposite side. A fixed contact device comprising two contact terminals each provided with a screw terminal, the contact pieces being bridge-opened by a movable contact, the fixed contact of the contact pieces being mounted on the mounting base of the insulating case. A locking projection having a sloping surface which coincides with a pedestal surface on which a passageable groove is formed and which protrudes in the insertion direction of the contact piece and is integrally formed with each of the facing partition walls and the arc-extinguishing chamber side of each of the facing partition walls. And a groove which is formed on the contact piece and is opposed to each other, and which is formed on both sides in the width direction of the contact piece and which can be press-fitted into each of the grooves and bulges in an arc shape in the thickness direction, the screw terminal side And fold it in the groove direction of the pedestal. Have insertable narrow section between Gerare the locking projection, characterized in that a locking piece which engages with the locking projection protruding from the narrow portion.

[Action]

In the fixed contact device according to the present invention, the fixed contact of the contact piece is inserted along the groove provided in the pedestal, and the arc-shaped tongues formed on both sides of the contact piece sandwich the pedestal in the arc-extinguishing chamber. Attached state of the contact piece by press-fitting into the groove provided on the side and engaging the locking piece protruding from the narrow portion formed by the contact piece with the locking projection integrally formed with the partition wall at the pedestal end Since the contact piece is held at two points and the tongue piece provided on the contact piece is formed in an arc shape, it is caused by shavings caused by cutting or chipping the groove, and foreign matter entering from the groove of the pedestal. The contact failure accident that becomes is eliminated.

〔Example〕

1 to 11 are views showing an embodiment of a fixed contact device according to the present invention. FIG. 1 is a longitudinal sectional view of a main part adopted in an electromagnetic contactor, and FIG. 2 is a front view of FIG. , FIG. 3 to FIG. 5 are enlarged plan sectional views, front views, vertical sectional views, and
6 to 8 are enlarged plan sectional views, front views, and longitudinal sectional views of the main part of the insulating case, and FIGS. 9 to 11 are enlarged plan views, front views, and side views of the main parts, respectively. . In the figure, the same parts as those of the conventional device of FIG. This embodiment differs from the conventional device in that the mounting base 3 is mounted on the mounting base 3 of the insulating case 1 by press fitting the contact piece 15 and the mounting base 3 is scraped or chipped, and foreign matter is removed. The invasion can be prevented only by changing the shapes of the mounting base 3 and the contact piece 15. Therefore, as shown in FIGS. 6 to 8 only on one side, the mounting base 3 has a pedestal 1c of the insulating case 1.
On the arc-extinguishing chamber 1d side of the opposing partition walls 1a, 1b sandwiching the partition wall, short grooves 3a, 3b corresponding to the surface of the pedestal 1c are provided, and the anti-arc-extinguishing chamber 1 of the pedestal 1c is provided.
Locking protrusions integrally formed on the partitions 1a and 1b at the d-side end
3c and 3d are provided. On the pedestal 1c, a groove 3e for avoiding the protruding portion 15h of the contact piece 15 and an escape hole 3f for the tightening screw 11 are provided as in the case of the conventional device. On the other hand, as shown in FIGS. 9 to 11, the contact piece 15 has a stepped portion from a narrow contact stand 15a to which the fixed contact 14 inserted into the arc extinguishing chamber 1d is fixed to a wide terminal 15b. From contact stand
Between arcuate tongues 15c and 15d that are cut along 15a and bulge in the thickness direction, and the protrusions 3c and 3d of the mounting base 3 that are bent and extended toward the non-contact base 15a side of the terminal portion 15b. Is provided with a locking piece 15f having a narrow width portion 15e capable of intervening. The terminal portion 15b is provided with a screw hole 15g as in the conventional device.

In the above configuration, the contact piece 15 is moved along the surface of the pedestal 1c, and the tongue pieces 15c and 15d are press-fitted into the grooves 3a and 3b.
c and 15d are smoothly press-fitted because the tips are formed in an arc shape that does not protrude from the thickness of the contact base 15a.
A sufficient holding force can be obtained between 3a and 3b (Figs. 3 and 5).
Figure). Further, at this time, the narrow portion 15e of the locking piece 15f is also intervened and locked between the locking projections 3c and 3d, and the opening of the groove 3e is closed. Therefore, when pressing the contact piece 15,
The 3a and 3b are securely mounted without being cut or chipped, foreign matter is prevented from entering from the outside, and the contact reliability of the contact device is improved.

The opening between the upper side of the fixed contact assembly 10 and the arc extinguishing chamber 1d is provided with a side wall 4a having a groove (not shown) into which the partition walls 1a, 1b ... Are fitted, as shown in FIG. It is closed by covering with the cover 4.

[Effect of device]

According to this invention, the insulating case is inserted into the arc-extinguishing chamber at both ends by press-fitting on the pedestal that divides the poles of the insulating case by partition walls, and fixed contacts are provided on opposite sides and screw terminals are provided on opposite sides. A fixed contact device comprising two contact pieces which are paired and opened by a movable contact, and a groove through which a fixed contact of the contact piece can pass is formed in a mounting base of the insulating case. Locking projections that are aligned with the pedestal surface and project in the insertion direction of the contact piece and that have slopes integrally formed with the opposing partition walls and the pedestal surface that is formed on the arc-extinguishing chamber side of the opposing partition walls. Tongue pieces that are formed on both sides in the width direction of the contact piece and that bulge in an arc shape in the thickness direction that can be press-fitted into each of the grooves, extend to the contact screw terminal side, and extend in the groove direction of the pedestal. It is bent and inserted between the locking protrusions. When the contact piece is attached to the mounting portion of the insulating case, the contact piece has a narrow portion that is capable of projecting and is provided with a locking piece that projects from the narrow portion and engages with the locking protrusion. The arc-shaped tongue piece formed on one piece is press-fitted into the groove formed on the arc-extinguishing chamber side of the opposing partition wall of the insulating case to support one end side of the contact piece, and protrudes from the narrow portion formed on the contact piece. The locking piece engages with the locking projection having the inclined surface formed integrally with the opposing partition wall of the insulating case and the other end side of the contact piece is supported, so that the contact piece is surely formed at two points. When the tongue piece is held, and the tongue piece is press-fitted into the groove, the tongue piece is formed in an arc shape, so that the position is reliably held without cutting or chipping the groove at the time of press-fitting, and Foreign matter is prevented from entering the arc-extinguishing chamber from the outside, and contact performance is improved. It is possible to provide a fixed contact device Robustness is improved.

[Brief description of drawings]

1 to 11 are views showing an embodiment of a fixed contact device according to the present invention. FIG. 1 is a longitudinal sectional view of a main part adopted in an electromagnetic contact device, and FIG. 2 is a front view of FIG. , FIG. 3 to FIG. 5 are enlarged plan sectional views, front views, vertical sectional views, and
6 to 8 are enlarged plan sectional views, front views, and longitudinal sectional views of the main part of the insulating case, and FIGS. 9 to 11 are enlarged plan views, front views, side views, and 12 and 13 are views showing an example of a conventional fixed contact device,
FIG. 12 is a front view of a main part, and FIG. 13 is a vertical sectional view. 1 ... Insulating case, 1a, 1b ... Partition, 1c ... Pedestal, 1d ...
… Arc extinguishing chamber, 3a, 3b …… Fine groove, 3c, 3d …… Locking protrusion, 3e ……
Groove, 11 …… Screw, 14 …… Fixed contact, 15 …… Contact piece, 15
a …… Contact block, 15b …… Terminal, 15c, 15d …… Tongue, 15e…
… Narrow part, 15f …… Locking piece.

Claims (1)

[Scope of utility model registration request] 1. An insulating case is inserted by press-fitting from both ends toward a central arc-extinguishing chamber on a pedestal partitioning the poles of the insulating case, and fixed contacts are provided on opposite sides and screw terminals are provided on opposite sides. A fixed contactor device comprising two contactor pieces that are bridge-opened by a movable contactor, wherein a groove through which a fixed contact of the contactor piece can pass is formed in a mounting base of the insulating case. Locking projections that are formed on the arc-extinguishing chamber side of the opposing partition walls and are aligned with the pedestal surface. Tongues provided with grooves facing each other, formed on both sides in the width direction of the contact piece and bulging in an arc shape in the thickness direction capable of being press-fitted into each of the grooves, extending to the screw terminal side and bent in the groove direction of the pedestal Can be inserted between the locking protrusions It has a narrow portion, the narrow and protrudes from the width portion fixed contact device being characterized in that a locking piece which engages with the locking projection.