JPS6114115Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic contactor equipped with an auxiliary contact unit.

A general electromagnetic contactor is composed of three main circuit contacts and one or two auxiliary contacts. Recent sequence control is becoming more precise and complex, and magnetic contactors are not only used to simply open and close three-phase circuits, but auxiliary contacts are often used as signal transmission circuits, and the number of auxiliary contacts is not enough with two poles. An increasing number of devices are adding auxiliary contacts with several poles.

FIGS. 1 and 2 show a conventional electromagnetic contactor, in which an auxiliary contact unit 2 is mounted on the electromagnetic contactor main body 1 to connect and separate an auxiliary movable contact attached to an auxiliary movable contact base to an auxiliary fixed contact. The auxiliary contact unit 2 is fixed to the terminal 4 of the electromagnetic contactor main body 1 with a mounting bracket 3 by tightening with screws 5, and the auxiliary contact unit 2 is attached to the end 7 of the movable contact base 6 of the electromagnetic contactor main body 1. The auxiliary movable contact base 8 is connected, and the auxiliary movable contact base 8 is pressed by a spring 9 so as to come into close contact with the end portion 7 of the movable contact base 6. When the electromagnetic contactor main body 1 is excited, the movable contact base 6 is attracted and moves, and at the same time, the auxiliary movable contact base 8 of the auxiliary contact unit 2 follows and moves, opening and closing the auxiliary contacts.

However, such a device has disadvantages such as not losing the contact K pole of the electromagnetic contactor main body 1 in order to install the auxiliary contact unit 2, and the need to tighten the terminal 4 with the screw 5 using the buckle mounting bracket 3, which is troublesome. It was hot.

The present invention was developed in view of the above-mentioned drawbacks, and an object of the present invention is to provide an electromagnetic contactor in which an auxiliary contact unit can be securely fixed to the electromagnetic contactor body with one touch without using fixing parts such as screws. shall be.

An embodiment of the present invention shown in the drawings will be described below. In FIGS. 3 and 4, parts having the same functions as those in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted. 10 is a fixed contact base molded from synthetic resin of the electromagnetic contactor main body 1, and 11 is a fixed contact base formed on the axial end surface of the fixed contact base 10 that contacts the auxiliary contact unit 2, protruding from four corners and facing inward as shown in FIG. A pawl 12 formed with a groove-shaped recess 11a on one side.
13 is a dovetail-shaped groove formed in the end 7 of the movable contact block 6 in the same direction as the recess 11a, 13 is an auxiliary stationary contact block molded from synthetic resin of the auxiliary contact unit 2, and 14 is the auxiliary fixed contact block shown in FIGS. As shown in the figure, the first slender inner end is integrated with the auxiliary fixed contact base 13 so as to be engaged with the recess 11a of the fixed contact base 10, and protrudes in the shape of a pair of elastic horns. The protrusion 15 protrudes on the opposite side of the first protrusion 14 and is attached to the auxiliary fixed contact base 13 so as to engage with the recess 11a.
a pair of second protrusions 14a, 15a protruding from
16 is a protrusion slightly protruding outward from the end of the first protrusion 14 and the second protrusion 15, and 16 is the eighth protrusion.
This is a third protrusion provided at the end of the auxiliary movable contact base 8 so as to engage with the groove 12 of the movable contact base 6 as shown in the figure. The first protrusion 14 of the auxiliary fixed contact base 13 of the auxiliary contact unit 2 and The second protrusion 15 has a depth dimension slightly larger than B.
B ⁺ , height slightly smaller than C ^- , first protrusion 1
The dimension in the frontage direction of 4 is larger than D ⁺ and the dimension in the frontage direction of the second protrusion 15 is slightly smaller than D.
D ^- is becoming.

Next, the action will be explained. To attach the auxiliary contact unit 2 to the electromagnetic contactor main body 1, one of the first protrusions 14 provided on the auxiliary fixed contact base 13 of the auxiliary contact unit 2 is deformed so as to have elasticity inside. The protrusion 14a is attached to the fixed contact base 10 of the electromagnetic contactor main body 1.
Insert into the recess 11a of the claw 11 and push it laterally, and at the same time insert the third protrusion 16 of the auxiliary movable contact base 8.
into the groove 12 of the end 7 of the movable contact base 6.
When the auxiliary contact unit 2 is pushed in until the protrusion 15a contacts the pawl 11, the protrusion 14 of the first protrusion 14
When a protrudes from the concave portion 11a of the pawl 11 and is deformed inside the first protrusion 14, it expands outward due to the elasticity generated and returns to its original state, and the protrusion 14a hooks onto the pawl 11 to form an auxiliary fixing contact. The child base 13 is prevented from returning, and the auxiliary contact unit 2 is fixed. When removing the auxiliary contact unit 2, push the first protrusion 14 inward, release the catch from the claw 11, and press it.The auxiliary contact unit 2 can be easily removed from the electromagnetic contact body 1. .

As described above, according to the present invention, in an electromagnetic contactor, the first protrusion of the auxiliary fixed contact base of the auxiliary contact unit is elastically attached to the concave part of the pawl provided on one end surface of the fixed contact base of the electromagnetic contact body. while inserting and engaging from the lateral direction until the second protrusion is locked, insert the first protrusion of the auxiliary movable contact base of the auxiliary contact unit into the dovetail-shaped groove of the movable contact base of the electromagnetic contact body. Since the auxiliary contact unit is fixed to the electromagnetic contactor body by engaging the protrusions 3, the auxiliary contact unit can be securely fixed to the electromagnetic contactor body with one touch without using fixing parts such as screws. There is an effect that can be done.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventional electromagnetic contactor;
The figure is a partially sectional front view, Fig. 3 is a plan view showing an embodiment of the electromagnetic contactor of the present invention, Fig. 4 is a partially sectional front view, and Fig. 5 is a fixed contact of the main parts of Fig. 4. FIG. 6 is a plan view of the auxiliary contact unit, FIG. 7 is a front view, and FIG. 8 is a perspective view of essential parts of the auxiliary contact unit. DESCRIPTION OF SYMBOLS 1... Magnetic contactor main body, 2... Auxiliary contact unit, 6... Movable contact base, 7... End part, 8... Auxiliary movable contact base, 10... Fixed contact base, 11...
Pawl, 11a... recess, 12... groove, 13... auxiliary fixed contact base, 14... first protrusion, 15...
Second protrusion, 16...Third protrusion.

Claims (1)

[Scope of utility model registration request] An auxiliary contact unit is attached to an electromagnetic contactor main body that moves a movable contact of a movable contact base, which is moved by an electromagnet fixed to the fixed contact base, toward and away from the fixed contact of the fixed contact base, and the movable contact In an electromagnetic contactor in which an auxiliary movable contact of an auxiliary movable contact base coupled to a slave base is brought into contact with and separated from an auxiliary fixed contact, projecting from four corners of the auxiliary contact unit side end surface of the front fixed contact base. The auxiliary fixed contact base of the auxiliary contact unit has a pawl that faces on the inside and forms a unidirectional groove-like recess, and a pawl that has elasticity toward the outside so as to be inserted into the recess of the pawl from the lateral direction. A pair of horn-shaped first protrusions protruding from one end of the fixed contact base side end surface, and the other end facing the first protrusions is inserted laterally into the recess. a pair of second protrusions; a third protrusion of the auxiliary contact base that engages with a dovetail groove of the movable contact base protruding from the fixed contact base; and the first protrusion. and a protrusion that protrudes from each protrusion so that the second protrusion is engaged with the pawl when the second protrusion is inserted into the front recess.