JPH0329870Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field] The present invention relates to an electromagnetic contactor.

[Background Art] In conventional electromagnetic contactors of this type, the fixed iron core is fixed to the casing using a fixing device such as a rivet. However, the work of fixing the fixed iron core to the casing was troublesome, and the efficiency of the assembly work was low.

[Purpose of the invention] The present invention was made in view of the above points, and its main purpose is to provide an electromagnetic contactor with good assemblability that makes it easy to fix the fixed iron core to the casing. Our goal is to provide the following.

[Disclosure of the invention] The invention includes a casing, a fixed iron core disposed at the bottom of the casing, a position disposed above the fixed iron core and in contact with the fixed iron core, and a position spaced apart from the fixed iron core. a movable iron core that is movable between the movable iron core and a coil that is wound around the fixed iron core and that attracts the movable iron core toward the fixed iron core in an energized state;
A through hole is formed in the lower part of the fixed iron core, and a plate-shaped buffer spring running in a direction substantially perpendicular to the moving direction of the movable iron core is inserted into the through hole, and the top surface of both ends of the buffer spring is A stepped portion is formed on the inner circumferential surface of the casing to prevent the above-mentioned ends of the buffer spring from coming off upward, and to make elastic contact with the support protrusion protruding from the lower surface of the coil. By locking both ends of the buffer spring inserted through the hole with the stepped portion, the fixed iron core is prevented from slipping upward. In addition, since the buffer spring is in elastic contact with the support protrusion protruding from the lower surface of the coil, when the coil is energized, the floating of the fixed iron core due to the magnetic force that acts between it and the movable iron core is suppressed, and The shock generated when the movable iron core collides with the fixed iron core can be alleviated by the buffer spring.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. As shown in FIGS. 1 to 3, the casing 1 has an upwardly open body 1a and a body 1a.
A fixed iron core 2 is fixed at a fixed position at the bottom of the body 1a, and a movable iron core 3 is arranged at a distance above the fixed iron core 2. . The fixed iron core 2 and the movable iron core 3 are each formed into a substantially E-shape, and are arranged with their opening surfaces facing each other. A movable frame 4 made of an insulator is connected to the upper part of the movable iron core 3, and a movable contact plate 5 is connected to the upper part of the movable frame 4.
is retained. A fixed contact plate 6 fixed to the cover 1b is disposed below the movable contact plate 5 so as to face each other, and when the movable iron core 3 moves downward, the gap between the fixed contact plate 6 and the movable contact plate 5 is is beginning to close. The movable iron core 3 is urged away from the fixed iron core 2 by a conventional method such as a spring means,
Further, the cover 1b prevents it from coming off upward. A coil 7 is placed around the middle leg of the fixed iron core 2.
When this coil 7 is excited, the movable iron core 3 is attracted to the fixed iron core 2 side, and the movable iron core 3 moves downward, and as described above, the movable iron core 3 is connected to the movable contact plate 5. The gap with the fixed contact plate 6 is closed. Incidentally, in the lower part of the fixed iron core 2, a through hole 8 having a rectangular cross section long in the left and right directions is formed so as to pass through the fixed iron core 2 in the thickness direction, that is, in a direction substantially perpendicular to the moving direction of the movable iron core 3. A buffer spring 9 is inserted through the through hole 8, as shown in FIGS. 1 and 3. The buffer spring 9 has a strip-like shape, and has a pair of protrusions 10 on the central surface in the longitudinal direction.
are spaced apart in the longitudinal direction and protrude,
The amount of protrusion of this protrusion 10 is approximately equal to the height of the through hole 8 . On the other hand, the length of the buffer spring 9 is the length of the body 1
It is formed to be slightly longer than the width between the opposing inner surfaces of the body 1a, so that the buffer spring 9 is deflected when the buffer spring 9 is inserted into the body 1a. As shown in FIG. 1, a tapered portion 12 is formed on the inner surface of the body 1a, corresponding to the mounting position of the buffer spring 9, and inclined downward so as to gradually reduce the distance between the opposing surfaces. In the lower part of 1a, a stepped portion 13 is formed which is stepped from the lower end of the tapered portion 12 in a direction that increases the distance between the opposing surfaces. The buffer spring 9 is inserted into the through hole 8 formed in the lower part of the fixed iron core 2 as described above, and is inserted into the step part 13.
It is prevented from coming off by being locked at both ends in the longitudinal direction. Therefore,
By housing the buffer spring 9 in the body 1a, the fixed iron core 2 is simultaneously fixed at a fixed position in the body 1a. A pair of support protrusions 14 protrude from the lower surface of the coil 7, and the support protrusions 14 are placed on the buffer spring 9. As a result, the upper surfaces of both ends of the buffer spring 9 are in elastic contact with the support protrusions 14 protruding from the lower surface of the coil 7, so that when the coil 7 is excited, there is a gap between the coil 7 and the movable iron core 3. The floating of the fixed iron core 2 due to the magnetic force acting on the movable iron core 3 can be suppressed, and the shock generated when the movable iron core 3 collides with the fixed iron core 2 can be alleviated by the buffer spring 9.

In assembling the buffer spring 9 into the casing 1, the buffer spring 9 is first inserted into the through hole 8 provided in the fixed iron core 2, as shown in FIGS. 4 to 6. Here, the projections 10 are located corresponding to both ends of the through hole 8. In that state, move the buffer spring 9 to the tapered part 1.
2 into the body 1a, both ends of the buffer spring 9 get over the step 13 and are locked to the step 13 as a locking portion. At this time, since the buffer spring 9 bends in a downwardly convex manner, the protrusion 10 is locked in the opening of the through hole 8, and the buffer spring 9 is bent.
The position is fixed. By inserting the buffer spring 12 into the fixed iron core 2 in this way, the buffer spring 9 can be fixed to the body 1a and the fixed iron core 2 can be fixed at the same time.
This also makes it possible to fix the fixed iron core 2 and the buffer spring 9 easily.

[Effects of the invention] As described above, the present invention consists of a casing, a fixed iron core disposed at the bottom of the casing, a position disposed above the fixed iron core and in contact with the fixed iron core, and a position from which the fixed iron core is connected. The fixed iron core is equipped with a movable iron core that is movable between separate positions, and a coil that is wound around the fixed iron core and that attracts the movable iron core toward the fixed iron core in an energized state. A through hole is formed in the lower part, and a plate-shaped buffer spring running in a direction substantially perpendicular to the moving direction of the movable iron core is inserted into the through hole, and the upper surface of the inner end of the buffer spring protrudes from the lower surface of the coil. A stepped portion is formed on the inner peripheral surface of the casing to elastically contact the provided support protrusion and prevent both ends of the buffer spring from slipping upward, and the buffer spring and the fixed iron core are integrated. This has the advantage that the buffer spring and the fixed iron core can be handled at the same time, and the buffer spring and the fixed iron core can be incorporated into the casing at the same time, making assembly work more efficient. Since the buffer spring and the fixed iron core are fixed in a fixed position in the casing by simply press-fitting them into the casing, the assembly work is simple. Further, by locking both ends of the buffer spring inserted through the through hole of the fixed iron core with the stepped portion, there is an effect of preventing the fixed iron core from slipping upward during assembly work. Moreover, since the buffer spring is brought into elastic contact with the support protrusion protruding from the lower surface of the coil, it is possible to suppress the floating of the fixed iron core due to the magnetic force that acts between it and the movable iron core when the coil is energized. This has the advantage that the shock generated when the movable iron core collides with the fixed iron core can be alleviated by the buffer spring.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention.
A cross-sectional view corresponding to the X-ray cross section, Figure 2 is the same as Figure 3 above.
FIG. 3 is a plan view of the same with the casing cover removed, and FIGS. 4 to 6 are cross-sectional views showing the assembly order of the same. 1 is a casing, 2 is a fixed iron core, 3 is a movable iron core, 7 is a coil, 8 is a through hole, 9 is a buffer spring, 13
14 is a step, and 14 is a support protrusion.

Claims (1)

[Scope of utility model registration request] A casing, a fixed iron core arranged at the bottom of the casing, and a movable iron core arranged above the fixed iron core and movable between a position in contact with the fixed iron core and a position away from the fixed iron core. It is equipped with an iron core and a coil that is wound around the fixed iron core and attracts the movable iron core toward the fixed iron core in an energized state. A plate-shaped buffer spring running in a direction substantially perpendicular to the direction of movement of the movable iron core is inserted through the casing, and the upper surfaces of both ends of the buffer spring are in elastic contact with support protrusions protruding from the lower surface of the coil, and the inner peripheral surface of the casing An electromagnetic contactor is provided with a stepped portion for preventing both ends of the buffer spring from slipping upward.