JP2000133109A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the molding die cost of a mold case for an electromagnetic contactor with an auxiliary contact. SOLUTION: A bottom frame 2 of an electromagnetic contactor with an auxiliary contact is divided into a body 2a and seat adapter 2b, and they are formed individually. The body 2a as a single part is used for an electromagnetic contactor without an auxiliary contact, and a pedestal adapter 2b is connected by engaging lugs 6 with dovetail grooves 11 when the body 2a is used for the electromagnetic contactor with an auxiliary contact. Since the molding die for the pedestal adapter 2b is small and simply structured, the cost is reduced compared with a case when a bottom frame 2 with a pedestal part is formed as a combined body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor with an auxiliary contact, and more particularly to a structure of a lower frame thereof.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing the appearance of a three-pole electromagnetic contactor having no auxiliary contact. In FIG. 4, the electromagnetic contactor has a molded case composed of an upper frame 1 and a lower frame 2, an operation electromagnet is housed in the lower frame 2, and a power supply side and a load side of each pole are provided before and after the upper frame 1. A main contact terminal 3 (only one side is visible in FIG. 4) is attached. A fixed contact is integrally provided at an end of each main contact terminal 3 facing each other, and a movable contact facing the fixed contact is held by a contact support mounted on a movable iron core of the operating electromagnet. These fixed and movable contacts are covered with a contact cover 4 mounted on the upper frame 1. Mounting flanges are integrally formed on the front and rear lower portions of the lower frame 2, and mounting holes 5 for mounting an electromagnetic contactor are provided at both ends thereof.

FIG. 5 is a perspective view showing the appearance of a three-pole electromagnetic contactor with auxiliary contacts. This electromagnetic contactor is mounted on the upper frame 1
Auxiliary contact portion 1b for accommodating auxiliary contacts on the side surface of main body 1a
Are integrally formed. The configuration of the upper frame body 1a is substantially the same as the upper frame 1 of FIG. On the other hand, in FIG. 5, a pedestal portion 2 b is integrally formed on the side surface of the main body 2 a of the lower frame 2 to abut against the lower surface of the auxiliary contact portion 1 b of the upper frame 1. Lower frame body 2
The configuration of “a” is substantially the same as the lower frame 2 of FIG. Although not shown, the auxiliary contact portion 1b houses an auxiliary contact that is linked to the main contact. The pedestal portion 2b closes the lower surface of the auxiliary contact portion 1b and plays a role of supporting this portion. Mounting holes 5 are provided at both ends of the mounting flanges before and after the lower frame.

[0004]

In the case of an electromagnetic contactor with auxiliary contacts, as shown in FIG. 5, an upper frame 1 and a lower frame 2 have auxiliary contacts 1b on their main bodies 1a and 2a.
And the pedestal 2b are integrally formed. Therefore, the electromagnetic contactor with auxiliary contacts needs to form the upper frame 1 and the lower frame 2 separately from the electromagnetic contactor without auxiliary contacts shown in FIG. Needed. SUMMARY OF THE INVENTION It is an object of the present invention to reduce a mold cost of a mold case in an electromagnetic contactor with an auxiliary contact.

[0005]

In order to solve the above-mentioned problems, the present invention comprises a mold case comprising an upper frame and a lower frame, wherein the upper frame has an auxiliary contact portion for accommodating an auxiliary contact on a side surface of the main body. In an electromagnetic contactor, which is integrally formed, and wherein the lower frame is provided with a pedestal portion abutting against a lower surface of the auxiliary contact portion,
The pedestal portion is formed as a pedestal adapter separate from the main body of the lower frame, and the pedestal adapter is fitted into the lower frame main body and connected thereto (Claim 1). Thereby, the lower frame body can be shared with the one having no auxiliary contacts, and the pedestal adapter can be connected to this to form the lower frame with the auxiliary contacts. In this case, the pedestal adapter is a lower part integrally formed with the pedestal part. Since the structure is simpler and smaller than the frame, the mold cost is lower.

Preferably, the pedestal adapter is connected by providing a dovetail groove in the lower frame body, integrally forming a handle (mortise) with the pedestal adapter, and inserting the handle into the dovetail groove. Item 2). Preferably, the base adapter is provided with a dovetail groove on a side surface for coupling another unit.

[0007]

FIG. 1 is an exploded perspective view of a lower frame showing an embodiment of the present invention, and FIG. 2 is a perspective view of a three-pole electromagnetic contactor with auxiliary contacts using the lower frame of FIG.
Note that the same reference numerals are used for the portions corresponding to the conventional example. 1 and 2, the upper frame 1 is the same as the conventional configuration (FIG. 5), and the lower frame 2 is composed of a lower frame main body 2a and two left and right pedestal adapters 2b coupled to side surfaces thereof. ing. The lower frame body 2a is used alone as the lower frame 2 of FIG. 4 having no auxiliary contact.

In FIG. 1, the pedestal adapter 2b is
The lower frame 2 has a pedestal portion 2b cut along the II line, and has substantially the same front-rear symmetric shape, a hollow prismatic body with a bottom, and front and rear flange portions. The surface and the side surface are formed on the same surface as the corresponding surface of the auxiliary contact portion 1a of the upper frame 1. Note that the two pedestal adapters 2b shown in FIG. 1 are the same on the left and right, and are used in an upside-down relationship with each other. On the side of the pedestal adapter opposed to the lower frame body 2a, two vertical handles 6 each having an inverted trapezoidal cross section are provided symmetrically in the front-rear direction, and two semicircular positioning protrusions 7 are provided symmetrically in the front-rear direction on the upper inside thereof. A retaining projection 8 formed of a horizontal ridge is provided below the center. Mounting holes 5 'are provided in the front and rear adapter flanges, respectively.

On the side surface of the pedestal adapter 2b opposite to the lower frame body 2a, two positioning recesses 9 of the same shape are provided on the back side of the positioning projections 7 and are provided at the front and rear. Two dovetail grooves 10 opening downward are provided symmetrically in the front-rear direction. On the other hand, on the side surface of the lower frame main body 2a facing the pedestal adapter 2b, two dovetail grooves 11 opening and closing and two front and rear dovetail grooves 11 opening upward correspond to the handle 6 and the positioning projection 7 of the pedestal adapter 2b. Each of the recesses 12 is provided, and a rectangular locking recess 13 which opens downward corresponding to the retaining projection 8 is provided.

When the lower frame body 2a is used as an electromagnetic contactor with auxiliary contacts in the lower frame body 2a and the pedestal adapter 2b, the lower end of the handle 6 is aligned with the upper opening of the dovetail groove 11 and is pushed in as it is. The handle 6 is fitted into the dovetail groove 11, and the pedestal adapter 2b is connected to the lower frame body 2a. At this time, the positioning projection 7 slides on the opposing side surface of the lower frame main body 2a in a state in which the positioning projection 7 is slightly retracted due to elastic deformation of the side wall of the pedestal adapter 2b on which the locating adapter 2b is formed. 2
When it becomes flush with the upper surface of a, it falls into the locking recess 13 and engages with the upper edge step, thereby preventing the pedestal adapter 2b from coming off. At the same time, the positioning projections 7 are fitted into the positioning recesses 12, and further pushing is stopped.

FIG. 2 shows an electromagnetic contactor with auxiliary contacts formed by combining the upper frame 1 of FIG. 5 with the lower frame body 2a to which the pedestal adapter 2b is connected as described above. Is substantially the same as the integral lower frame 2 in FIG. The mounting of the electromagnetic contactor of FIG. 2 is performed using the mounting hole 5 'of the pedestal adapter 2b. The mounting hole 5 'is located at the same position as the mounting hole 5 of the integral lower frame 2 in FIG. 5, and compatibility is maintained. The positioning recess 9 and the dovetail groove 10 on the outer surface of the pedestal adapter 2b are used for mounting another unit such as an interlock unit (a unit for preventing simultaneous input of two adjacent electromagnetic contactors).

The pedestal adapter 2b shown in FIG. 1 shows an example in which the drawing direction of the molding die is vertical, but FIG. 3 shows an example in which the drawing direction of the molding die is horizontal (arrow direction). . When the drawing direction is set to the left and right directions, the moving distance of the split mold at the time of molding is small, and the molding operation is correspondingly facilitated. The shapes of the respective parts in FIG. 3 to which the same reference numerals are given as in FIG. 1 are slightly different from those in FIG. 1 due to the relationship of the mold structure, but there is no particular difference in function. In the illustrated embodiment, an example is shown in which the pedestal adapters 2b are connected to both the left and right sides. However, the upper frame 1 having the auxiliary contacts built in only on one side can be handled by connecting the pedestal adapters 2b on only one side. Can be.

[0013]

As described above, according to the present invention, a pedestal adapter is provided, which is connected to an electromagnetic contactor having no auxiliary contacts and to a lower frame shared with an electromagnetic contactor, and is used for an electromagnetic contactor with auxiliary contacts. The mold cost can be significantly reduced as compared with the case where the lower frame is separately formed according to the presence or absence of the auxiliary contact.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lower frame of an electromagnetic contactor showing an embodiment of the present invention.

FIG. 2 is a perspective view of an electromagnetic contactor using the lower frame of FIG. 1;

FIG. 3 is a perspective view of a pedestal adapter showing another embodiment of the present invention.

FIG. 4 is a perspective view of an electromagnetic contactor having no auxiliary contact.

FIG. 5 is a perspective view of a conventional electromagnetic contactor with auxiliary contacts.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper frame 1a Upper frame main body 1b Auxiliary contact part 2 Lower frame 2a Lower frame main body 2b Pedestal adapter 3 Main contact terminal 6 Handle 7 Positioning protrusion 8 Retaining protrusion 9 Positioning concave part 10 Dove groove 11 Dove groove 12 Positioning concave part 13 Locking concave part

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Nakamura 1-1 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. No. 1 Fuji Electric Co., Ltd. (72) Inventor Etsuya Hiramatsu 1-1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Fuji Electric Co., Ltd.

Claims (3)

[Claims] An auxiliary contact portion for accommodating an auxiliary contact is integrally formed on a side surface of a main body of the upper frame; and the lower frame includes a mold case formed of the auxiliary contact portion. In an electromagnetic contactor provided with a pedestal portion to be abutted on the lower surface, the pedestal portion is formed as a pedestal adapter separate from the main body of the lower frame, and the pedestal adapter is fitted to the lower frame main body by being fitted thereto. An electromagnetic contactor characterized in that: 2. A dovetail groove is formed in the lower frame body, and a handle is integrally formed with the pedestal adapter. The handle is inserted into the dovetail groove to connect the pedestal adapter to the lower frame body. The electromagnetic contactor according to claim 1, wherein: 3. The electromagnetic contactor according to claim 2, wherein a dovetail groove for connecting another unit is provided on a side surface of said pedestal adapter.