JPH11339618A - Auxiliary contact unit for electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate extension of an auxiliary contact unit to be mounted on the side surface of an electromagnetic contactor. SOLUTION: As a means for mounting an auxiliary contact unit 1 (1B) on the second stage on an auxiliary contact unit 1 (1A) fastened to an electromagnetic contactor by a mounting screw, a groove 7a is formed on the mounting surface of one side wall of the case 6 of the auxiliary contact unit 1, a projection 8a is formed on the mounting surface of the other side wall thereof, and these are vertically slid and engaged to each other. According to this, it is not required to remove the mounting screw of the first-stage auxiliary contact unit mounted on the electromagnetic contactor in the extension of the auxiliary contact unit as in a conventional structure of integrally fastening two stages or more of auxiliary contact units by a common mounting screw, and the extension work within a narrow board is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary contact unit mounted on a side surface of an electromagnetic contactor, and more particularly to a means for simultaneously mounting two or more auxiliary contact units on the same side of an electromagnetic contactor.

[0002]

2. Description of the Related Art As described in Japanese Utility Model Application Laid-Open No. 58-66538, for example, the auxiliary contact unit is conventionally generally fastened to an electromagnetic contactor using mounting screws. As shown in FIG. 8 again, the auxiliary contact unit 1 is provided with a pair of left and right mounting holes 2, and when the auxiliary contact unit 1 is mounted on the electromagnetic contactor 3, the mounting screw 4 is passed through the mounting hole 2 and electromagnetically connected. The auxiliary contact unit 1 is screwed into the screw hole 5 of the contactor 3 and tightened to the electromagnetic contactor 3. FIG. 9A shows a state in which the mounting screw 4 passes through the auxiliary contact unit 1. On the other hand, the number of auxiliary contact units 1 attached to the electromagnetic contactor 1 is not limited to one, but according to the required number of auxiliary contacts, two or even three stages are attached as shown in FIG. Can be In this case, the mounting screws 4 used are longer than those shown in FIG.

[0003]

In the prior art described above, when it is desired to add a single-stage auxiliary contact unit to two stages, a short mounting screw is removed, and then the second-stage auxiliary contact unit is superimposed on the first stage. A long mounting screw is inserted and tightened. However, in the panel, another device is often installed on the side of the electromagnetic contactor, and it is difficult to remove the mounting screw and replace it with another device. Sometimes it didn't. Also,
The auxiliary contact unit must be attached together with a mounting screw having a length corresponding to the number of mounting steps, which makes shipping management troublesome.

As a means for attaching the auxiliary contact unit to the electromagnetic contactor, a pair of right and left hook-like parts is projected from the attachment surface of the auxiliary contact unit as shown in Japanese Utility Model Application Laid-Open No. 58-66538. There is known a structure in which a mounting leg is provided, and the mounting leg is pushed into and engaged with a mounting window of an electromagnetic contactor while being bent, thereby fixing the auxiliary contact unit to the electromagnetic contactor. However, such a mounting leg needs a considerable thickness and length to have flexibility while securing strength, and if this structure is used as a connecting means between auxiliary contact units, a thin auxiliary leg is required. Since the mounting legs are accommodated in the case of the contact unit, there is a problem in that the contact support and the arrangement of the movable and fixed contacts in the case are restricted. Accordingly, an object of the present invention is to easily attach / detach and attach components in the auxiliary contact unit when the auxiliary contact unit of the second stage or later is mounted on the auxiliary contact unit of the first stage mounted on the electromagnetic contactor. Another object of the present invention is to obtain a connecting means which does not affect the above.

[0005]

In order to solve the above-mentioned problems, the present invention provides an auxiliary contact support slidably guided by a case and a sliding direction of the auxiliary contact support on one side wall of the case. A connecting protrusion protruding from a long hole formed along the long hole, and a long hole formed along the sliding direction of the auxiliary contact support on the other side wall of the case, and the connecting protrusion is insertable. A coupling hole is provided concentrically, the coupling protrusion is mounted on a side surface of the electromagnetic contactor, the coupling protrusion is inserted into a coupling hole of a contact support of the electromagnetic contactor, and an electromagnetic contactor that opens and closes in conjunction with the electromagnetic contactor. In the auxiliary contact unit, a pair of left and right protrusions and grooves that can be engaged with each other by sliding in the vertical direction are formed on the mounting surfaces of the one and other side walls of the case, and the auxiliary contact unit is formed through these protrusions and grooves. And it is to the Judges can be connected to each other.

According to such a means, the auxiliary contact units can be connected to each other by engagement of the projection and the groove without using a mounting screw, and this connection is performed by sliding in the vertical direction. The work space on the side of the electromagnetic contactor required for attaching and detaching the unit is reduced, and the auxiliary contact unit can be easily added even in a narrow panel. Also, since the projections and grooves for engagement are formed on the mounting surface of the case side wall, they are not related to the arrangement of components inside the case.

In the above-mentioned auxiliary contact unit, it is preferable that concave and convex portions engageable with each other are provided on one and the other side walls of the case, and the auxiliary contact units are prevented from coming off from each other via these concave and convex portions. . In this case, a vertical guide groove from the upper end surface to the concave portion is formed on the side wall provided with the concave portion, and the guide groove has the same width as the concave portion and a depth smaller than the concave portion, And if the upper half has an inclined surface which descends toward the upper end surface of the side wall, when fitting the convex portion into the concave portion, the guide groove slides the convex portion on the inclined surface. And smoothly fall into the recess.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 is a cross-sectional view of an auxiliary contact unit connected in two stages, FIG. 2 (A) is a plan view of the auxiliary contact unit of FIG. 1, FIG. 2 (B) is a side view thereof,
2C is a longitudinal sectional view, FIG. 3 is a right side view of FIG. 2C, and FIG. 4 is a sectional view taken along line IV-IV of FIG. 2A.
In these figures, the case 6 of the auxiliary contact unit 1 has a split structure composed of a substrate 7 and a cover 8, and these are configured so that the engaging legs of the cover 8 are engaged with the engaging holes of the substrate 7. Are connected to each other. A rectangular cylindrical auxiliary contact support 9 is slidably accommodated in the case 6 in the vertical direction of FIG. 4 and movable contactors 10 are provided at upper and lower ends of a window hole provided so as to penetrate in the horizontal direction of FIG. And 11 are inserted, and are pressed and held by a contact spring 12 fitted between them.

A pair of front and rear fixed contacts 13 and 14 are fixed to the case 6 above and below the movable contacts 10 and 11, respectively, and terminal screws 15 are attached to their terminals. The movable contacts 10 and 11 alternately contact the fixed contacts 13 and 14 via the contacts, respectively, and bridge the front and rear terminals of the fixed contacts 13 and 14, respectively. Not attached to the electromagnetic contactor, and with the electromagnetic contactor released
As shown in FIG. 4, the movable contact 10 contacts the fixed contact 13 to form a normally closed contact (so-called b contact), and the movable contact 11 is separated from the fixed contact 14 and becomes a normally open contact (so-called a contact). Contacts).

At the upper end of the auxiliary contact support 9, a prismatic connecting projection 9a is integrally formed so as to protrude from the elongated hole 16 of the substrate 7, and the upper end of the cover 8 is opposed to the opened elongated hole 17. A connection hole 9b is provided concentrically with the connection protrusion 9a. Here, each of the elongated holes 16 and 17 is formed along the sliding direction of the auxiliary contact support 9, and the connecting hole 9b is formed in a square hole into which the connecting protrusion 9a can be inserted. The auxiliary contact unit 1 is tightened to the electromagnetic contactor with a mounting screw in the same manner as in the prior art. For this purpose, the case 6 is provided with a pair of left and right mounting holes 2 (FIG. 2B). Stepped hole 2a (FIG. 2B) of cover 8 having a counterbore for accommodating the head of the mounting screw and substrate 7
And a cylindrical hole 2b (FIG. 3).

On the other hand, in order to connect the auxiliary contact unit 1 of the second stage to the auxiliary contact unit 1 mounted on the electromagnetic contactor, and further to connect the auxiliary contact unit 1 of the third stage thereon, one and the other side walls of the case 6 are attached. A pair of left and right protrusions 8a and grooves 7a that can be engaged with each other by sliding in the vertical direction are formed on the surface. That is, the protrusions 8a are formed in a dovetail shape on both left and right sides of the side surface (mounting surface) of the cover 8, and the grooves 7a are formed.
Are formed on the left and right sides of the side surface (mounting surface) of the substrate 7 and are formed in a groove shape, and the engagement length thereof is set shorter than the slidable distance of the auxiliary contact support 9.

The auxiliary contact unit 1 has a second-stage or third-stage auxiliary contact unit 1 connected thereto.
In order to prevent the case 6 from coming off, a concave portion 8b and a convex portion 7b that can be fitted to each other are provided on one and the other side walls of the case 6, respectively. That is, a pair of right and left rectangular concave portions 8b (FIG. 2B) are formed on the mounting surface of the cover 8, and correspondingly, the mounting surface of the substrate 7 has a horseshoe-shaped convex with a lower part rounded in an arc shape. A portion 7b (FIG. 3) is formed. Convex part 7
The end face b is at the same height as the mounting surface of the substrate 7 as shown in FIG. The cover 8 is formed with a vertical guide groove 8c extending from the upper end surface to the concave portion 8b. The guide groove 8c has the same width as the concave portion 8b, the depth is smaller than the concave portion 8b, and has an inclined surface 8d descending toward the upper end surface of the cover 8 in the upper half portion.
On both sides of d, it is expanded in an inverted C shape.

The auxiliary contact unit 1 is mounted on a side surface of an electromagnetic contactor (not shown) by mounting screws, as in the conventional example shown in FIG. At this time, the connection protrusion 9a of the auxiliary contact support 9 is inserted into a connection hole of a contact support (not shown) of the electromagnetic contactor, and the auxiliary contact unit 1 is opened and closed integrally with the electromagnetic contactor. When connecting the second-stage auxiliary contact unit 1 (1B) to the auxiliary contact unit 1 (1A) mounted on the electromagnetic contactor, as shown in FIG. The connection projection 9a of the auxiliary contact support 9 is inserted into the connection hole 9b (FIG. 2C) of the auxiliary contact support 9 of the first-stage auxiliary contact unit 1A, and the projection 8a of the first-stage auxiliary contact unit 1A is inserted into the connection projection 9a. Groove 7 in auxiliary contact unit 1B of the stage
a is engaged.

FIGS. 5A to 5C show the procedure for connecting the second-stage auxiliary contact unit 1B to the first-stage auxiliary contact unit 1A. 5 and 6, the second stage (left side in the figure) of the auxiliary contact support 9 is pushed down against the contact spring 12 as shown in FIG.
The second-stage connecting projection 9a is inserted into the first-stage connecting hole 9b with the first-stage groove 7a positioned above the first-stage (right side in the figure) projection 8a. Next, the second-stage groove 7a is fitted into the first-stage protrusion 8a, and the second-stage auxiliary contact unit 1B is slid downward as shown in (B) to (C). 2
The same applies to the case where the third stage is connected on the second stage auxiliary contact unit 1B.

FIGS. 7A to 7C show a situation in which the projection 7b fits into the recess 8b during the connection process. In FIG. 7, the convex portion 7b located above the concave portion 8b in the state of FIG. 7A has a guide groove 8c as shown in FIG.
When entering, it is guided on both sides and sloped 8d
And is gradually lifted by contacting with the concave portion 8b to fit into the concave portion 8b at (C), and a step between the concave portion 8b and the guide groove 8c prevents the auxiliary contact unit 1B in the second stage from coming out upward.

In the above-described embodiment, the second-stage auxiliary contact unit 1B which is added to the first-stage auxiliary contact unit 1A mounted on the electromagnetic contactor has a protrusion 8
a and the groove 7b are connected to each other, so that it is not necessary to remove the mounting screw of the first-stage auxiliary contact unit 1A and replace it with a longer one at the time of expansion, and to use the electromagnetic contactor laterally required at that time. Is restricted to a minimum range for inserting the connecting projection 9a. The connection of the auxiliary contact units 1A and 1B is performed by sliding in the vertical direction. At this time, the auxiliary contact unit 1 having a height lower than that of the electromagnetic contactor can be slid upward from the upper surface of the electromagnetic contactor. And no extra working space is required upwards.

Further, since the projections 8a and the grooves 7a of the case 6 are formed on the mounting surface of the case side wall, the auxiliary contact support 9 and the movable / fixed contacts 10, 1 in the case 6 even in the engaged state.
It does not hinder the arrangement of 1, 13, 14 and the like. Further, the fitting of the concave portion 8b and the convex portion 7b prevents the auxiliary contact unit 1 from coming off in the second and subsequent stages, and the convex portion 7b is formed by the guide groove 8c having the inclined surface 8d.
So that their fitting is performed smoothly. The auxiliary contact units 1 of the second and subsequent stages, which are prevented from falling off, can be easily pulled out upward by inserting the tip of the driver between the mounting surfaces and prying. Also, cover 8
The long hole 17 is closed by a plug-in type auxiliary cover 18 as shown in FIG. 2B when the auxiliary contact unit 1 of the next stage is not connected thereto. Case 6
The relationship between the protrusion 8a and the groove 7a formed in the above embodiment may be opposite to that in the above embodiment.

[0018]

As described above, according to the present invention, the auxiliary contact unit can be easily added to the electromagnetic contactor installed in the panel, and the length of the auxiliary contact unit differs when shipping the auxiliary contact unit. There is no need to attach mounting screws, and parts management is simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an auxiliary contact unit connected in two stages, showing an embodiment of the present invention.

FIG. 2 shows the auxiliary contact unit of FIG. 1 alone;
(A) is a plan view, (B) is a side view, and (C) is a longitudinal sectional view.

FIG. 3 is a right side view of FIG. 2 (C).

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5A and 5B show a procedure for connecting the auxiliary contact unit of FIG. 2 in two stages, wherein FIG. 5A shows a state in which a connecting projection of an auxiliary contact support is inserted into a connecting hole, and FIG. The state where the unit is being slid, and the state shown in FIG.

FIG. 6 is a left side view of FIG. 5, (A), (B) and (C).
Respectively correspond to (A), (B) and (C) in FIG.

FIG. 7 is an enlarged view of a main part of FIG. 2, showing a procedure in which a convex portion of the second-stage auxiliary contact unit is fitted into a concave portion of the first-stage auxiliary contact unit, and (A), (B) and (C). ) Respectively correspond to (A), (B) and (C) in FIG.

FIG. 8 is an exploded perspective view of an electromagnetic contactor and an auxiliary contact unit according to the related art.

9A and 9B show a state in which a mounting screw penetrates the auxiliary contact unit of FIG. 8; FIG.
(B) is a case of two stages.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auxiliary contact unit 6 Case 7 Substrate 7a Groove 7b Projection 8 Cover 8a Projection 8b Depression 8c Guide groove 8d Inclined surface 9 Auxiliary contact support 9a Connection projection 9b Connection hole 10 Movable contact 11 Movable contact 13 Fixed contact 14 Fixed contact Child 16 Long hole 17 Long hole 18 Auxiliary cover

Claims (3)

[Claims] An auxiliary contact support slidably guided by a case, a connecting projection projecting from an elongated hole formed in one side wall of the case along a sliding direction of the auxiliary contact support; The other side wall of the case is provided concentrically with a long hole formed along the sliding direction of the auxiliary contact support, and a connection hole into which the connection protrusion can be inserted, and is mounted on the side surface of the electromagnetic contactor. In the auxiliary contact unit of the electromagnetic contactor, wherein the connection protrusion is inserted into a connection hole of a contact support of the electromagnetic contactor and opens and closes in conjunction with the electromagnetic contactor, the mounting surface of one and the other side walls of the case A pair of left and right protrusions and grooves that can be engaged with each other by sliding in a vertical direction, and the auxiliary contact units can be connected to each other via these protrusions and grooves. Tactile auxiliary contact unit. 2. A recess and a projection which can be fitted to each other on one side wall and the other side wall of the case, and the auxiliary contact units are prevented from coming off from each other through these projections and depressions. The auxiliary contact unit for an electromagnetic contactor according to claim 1. 3. A vertical guide groove extending from an upper end surface to the concave portion is formed in the side wall having the concave portion.
3. The electromagnetic device according to claim 2, wherein the guide groove has the same width as the recess, the depth is smaller than the recess, and the upper half has an inclined surface descending toward the upper end surface of the side wall. Auxiliary contact unit for contactor.