JP3011090B2 - Electromagnetic contactor and method for detecting presence / absence of buffer member inside electromagnetic contactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor and a method for detecting the presence or absence of a buffer member inside the electromagnetic contactor. More specifically, in an electromagnetic contactor having an upper case and a lower case, the presence or absence of an internal buffer member can be detected after or during assembly of both cases, and the engagement member is damaged when disassembling both cases. The present invention relates to an electromagnetic contactor that can be easily disassembled without any problem.

[0002]

2. Description of the Related Art An electromagnetic contactor has an upper case and a lower case which are detachably screwed. For example, an E-shaped fixed iron core is housed at the bottom of the lower case, and an E-shaped movable iron core is provided in the upper case above the lower case so as to urge the same to the opposite side to the fixed iron core. is there. An exciting coil is provided between the movable iron core and the fixed iron core. The excitation of the exciting coil attracts the movable iron core toward the fixed iron core. This movement of the movable iron core causes the contacts to contact or separate from each other, thereby closing or opening the terminals.

[0003] Since such an electromagnetic contactor is used under various electric conditions, it is necessary for the user to replace the exciting coil with an exciting coil suitable for the electric conditions.
At this time, it is easy to attach and detach the upper case and the lower case,
In order to further reduce the cost, a structure is adopted in which the claws are engaged with the engagement holes of the upper case and the two cases are joined by utilizing the elasticity of a material (for example, a thermoplastic resin) used for the lower case. I was However, in this structure, when the claw portion is pushed inward from the outside of the engagement hole to disengage and disassemble, the claw portion may be pushed too far and be broken.

Therefore, as a countermeasure, a structure as shown in FIG. 8 is employed. This structure is similar to that of the lower case 81.
The claw portion 83 of the engaging member 82 provided on the upper case 84
The two cases 81 and 84 are integrated by being engaged with an engagement hole 85 provided in the upper case 84. The upper case 84 is engaged when the engagement member 82 is pushed inward to release the engagement. A stopper 86 is provided to prevent the joint member 82 from bending more than necessary to prevent breakage.

Further, as described above, the electromagnetic contactor attracts the movable iron core to the fixed iron core by the excitation of the exciting coil to make contact therewith. Therefore, when the two iron cores come into contact with each other, a considerable impact due to a collision is applied to the two iron cores. In order to alleviate this impact and prevent fluttering of the iron core and chattering of the contactor, a plate-like cushioning member made of rubber or the like is sandwiched between the fixed iron core and the bottom of the lower case. .

[0006]

However, the above-mentioned conventional magnetic contactor has the following problems. (A) Since the conventional stopper 86 is provided on the upper case 84 side, as shown in FIG. 8, the stopper 86 is brought into contact with the upper side of the engaging member 82 to stop. For this reason, as shown in FIG. 9, for example, a normal flat-blade screwdriver 87 whose tip is thin and whose body is thicker with a slope in front is inserted into the engagement hole 85 and the claw portion 83 of the engagement member 82 is engaged. Is released, the flat head screwdriver 87 enters the upper gap, and the tip end of the stopper 8
6, the claws 83 are pressed downward by the torso, so that the engaging member 82 cannot be sufficiently pressed, and it takes time to separate the two cases 81 and 84.

(B) The buffer member is housed in a case when the electromagnetic contactor is assembled on a production line. At this time, since the fixed iron core is covered from above, the only way to check whether or not the buffer member is sandwiched in a later step was to disassemble. For this reason, there has been a demand for a proposal of means capable of automatically detecting the presence or absence of a buffer member in a production line.

The present invention solves the above-mentioned problems, and when disassembling the upper and lower cases, when the engaging member is pushed inward, the engaging member is sufficiently pushed in without being damaged. It is an object of the present invention to provide an electromagnetic contactor capable of easily releasing a claw portion by performing the above operation. Also, after or during the assembly of the electromagnetic contactor, there is provided an electromagnetic contactor and a method of detecting the presence or absence of a buffering member inside the electromagnetic contactor, wherein the presence or absence of an internal buffering member can be automatically detected in a production line. The purpose is to provide.

[0009]

Means of the present invention taken to solve the above problems are as follows. According to the first invention, an upper case and a lower case are provided, and one of the two cases is provided with an engaging member having a claw portion,
The other case has an engagement hole with which the claw portion is engaged, and the two cases can be assembled or disassembled by engaging or disengaging the claw portion and the engagement hole,
An electromagnetic contactor provided with a stopper for stopping the engaging member so that the engaging member does not bend more than a required amount inward, wherein the electromagnetic contactor is configured such that the stopper moves from a distal end to a proximal end of the engaging member. The electromagnetic contactor is provided so as to correspond only to the range.

According to a second aspect of the present invention, there is provided the electromagnetic contactor according to the first aspect, wherein a stopper is provided on the coil bobbin.

According to a third aspect of the present invention, there is provided an electromagnetic contactor having a non-conductive buffer member between a case and a fixed iron core as a conductor. In the electromagnetic contactor, an inspection hole through which a terminal member provided in the detection means can be inserted is provided in a portion corresponding to the buffer member.

According to a fourth aspect of the present invention, an upper case and a lower case are provided, one of the two cases is provided with an engaging member having a claw portion, and the other case is provided with an engagement member having the claw portion. The two cases can be assembled or disassembled by engaging or disengaging the claw portion and the engaging hole, and the engaging member is bent to the inner side more than a required amount. An electromagnetic contactor having a non-conductive cushioning member between the one or other case and the fixed iron core as a conductor. The stopper is provided so as to correspond only to a range from the distal end portion to the base end portion of the engaging member, and is provided to the detecting means in a portion corresponding to the buffer member in the one or other case. Inspection holes through which terminal members can be inserted There Te, an electromagnetic contactor.

According to a fifth aspect of the present invention, in the manufacture of an electromagnetic contactor having a non-conductive cushioning member between a case and a fixed iron core as a conductor, a method for manufacturing the magnetic contactor inside the electromagnetic contactor is provided. A method for detecting the presence / absence, in this method, in a portion of the case corresponding to the buffer member, providing an inspection hole through which a terminal member provided in a detection unit can be inserted, and attaching the terminal member to the inspection hole. Insert the tip into contact with the internal member, detect the presence or absence of a buffer member in the electromagnetic contactor by detecting the conductivity between the terminal members, and detect the presence or absence of a buffer member in the electromagnetic contactor. Is the way.

(Operation) In an electromagnetic contactor provided with a stopper for stopping the engaging member to prevent damage, the stopper is provided only in the range from the distal end to the proximal end of the engaging member.
For example, when disassembling both cases, even if a minus screwdriver or the like used enters the gap between the engagement hole and the tip of the engagement member, it does not hit the stopper. Therefore, the claw portion of the engagement member can be sufficiently pushed into the inside while preventing the engagement member from being damaged by the stopper, so that the engagement can be easily released.

In the case where the stopper is provided on the coil bobbin, since the stopper comes into contact with the back of the claw and serves as a fulcrum, the pushing force by a driver or the like can be adjusted with respect to the bending strength of the claw, and the claw can be sufficiently pushed in. be able to.

In the case of an electromagnetic contactor in which an inspection hole through which a terminal member provided in the detection means can be inserted is provided in a portion of the case corresponding to the cushioning member, the terminal member is inserted into the inspection hole and the tip portion is inserted. The presence or absence of the buffer member in the electromagnetic contactor can be detected by detecting the conductivity between the terminal members by contacting the internal member. That is, if the conductivity is not detected between the terminal members, the terminal member is in contact with the non-conductive buffer member, and the buffer member is housed between the case and the fixed iron core. Understand. In addition, when the conductivity is detected, it means that the terminal member is in contact with the fixed iron core as the conductor, the buffer member is not housed, and the electromagnetic contactor is defective. .

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. 1 is a longitudinal sectional view showing an embodiment of the electromagnetic contactor according to the present invention, FIG. 2 is an explanatory view showing the structure of an engaging member and a stopper of the electromagnetic contactor shown in FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is an exploded view of a lower case, a buffer member, a fixed iron core and a coil bobbin of the electromagnetic contactor, FIG. 4 is a plan view showing a state where the buffer member, the fixed iron core and the coil bobbin are accommodated in the lower case, and FIG. FIG. 6 and FIG. 6 are side views of the lower case.

Reference numeral A denotes an electromagnetic contactor having an upper case 1 and a lower case 2 which can be disassembled and assembled. The upper case 1 and the lower case 2 are formed of a synthetic resin which is a non-conductor. At the bottom of the lower case 2, a rectangular storage portion 20 for storing a buffer member 3 and a fixed iron core 4 described later is provided in a plan view. An inspection hole 27 is provided at the bottom of the housing portion 20 so as to penetrate at two places.

The left wall of the lower case 2 (the direction is indicated in FIG.
Based on The same applies to the following.
2 are provided. A claw 220 is provided at an upper end of the engagement member 22 so as to protrude outward. Note that the engaging member 22 is formed wide and has sufficient strength, so that unlike the engaging members 25 and 26 described below, no stopper is provided.

At the center of the upper part of the right wall 23 of the lower case, there is provided a housing 24 for housing a coil terminal side of the coil bobbin 5 described later. Engaging members 25 and 26 are provided outside the side walls 241 and 242 that form the housing 24. At the upper ends of the engaging members 25 and 26, claw portions 250 and 260 are provided to protrude outward. The engaging member 22 and the engaging members 25 and 26 are formed so that the base end side is gradually thinned so as to be easily bent.

The accommodation portion 20 of the lower case 2 accommodates a rectangular plate-like cushioning member 3. The buffer member 3 is made of synthetic rubber, which is a non-conductor. The fixed iron core 4 is housed in the housing portion 20 so as to cover the cushioning member 3. The fixed iron core 4 is formed of an iron square member so as to be substantially E-shaped when viewed from the front. The fixed iron core 4 is accommodated with the core 41 at the center and the contact portions 42 and 43 at both ends facing upward. The fixed iron core 4 is, of course, a conductor.

At the lower center of the fixed iron core 4, an insertion hole 44 is provided penetrating in the depth direction. A metal receiving plate 45 is detachably inserted into the insertion hole 44. The receiving plate 45 is formed to have a length approximately three times the thickness of the fixed iron core 4 in the depth direction, and both sides are projected from the insertion hole 44 by the same length. A coil bobbin 5 is arranged above the fixed iron core 4.

The coil bobbin 5 has a coil frame 50. An exciting coil 52 is wound around a tubular portion 51 having a rectangular shape in plan view provided at the center of the coil frame 50. On the bottom surface of the coil frame 50, two buffer springs 5 are provided in the depth direction.
3 are provided. The coil bobbin 5 is provided with these buffer springs 5.
3 is brought into contact with the receiving plate 45, and the fixed iron core 4
The core portion 41 is inserted into the through hole 510 of the tubular portion 51 and arranged. On the upper surface of the coil frame 50, a circular spring receiving portion 54 is provided. A terminal block 55 is provided on the right side of the spring receiving portion 54. The terminal block 55 has a coil terminal 5
6 are provided in two places.

At four places outside the spring receiving portion 54, spring stopper members 57 are provided to protrude upward. A plate-like stopper 58 is horizontally provided outside the two right-side spring stopper members 57. The stopper 58 is provided for the coil bobbin 5
Is stored in the lower case 2, the engagement member 25,
26 corresponding to the back.

In FIG. 4, when the coil bobbin 5 is accommodated in the lower case 2, the gap a between the tip of the stopper 58 and the back of the engaging members 25, 26
When the engagement width of 60 is b (shown in FIG. 2), it is set in a range slightly larger than b (maximum b + 2 mm). In the present embodiment, a = b + 1 mm is set. The height of the stopper 58 at that time is determined by the engagement member 25,
26 is slightly lower than the upper end.

The left wall 13 of the upper case 1 attached to the lower case 2 is provided with an engaging hole 14 for engaging with the claw 220 of the engaging member 22. Further, the right wall portion 15 is provided with two engaging holes 16 for engaging with the claw portions 250 and 260 of the engaging members 25 and 26, respectively. A contact frame 6 is provided so as to be slidable up and down. A movable iron core 7 is attached to a lower portion of the contact frame 6. The movable iron core 7 is E-shaped similarly to the fixed iron core 4, and has a core portion 71 and contact portions 72, 72 (one of which is not shown in FIG. 1). A buffer spring 73, whose upper side is narrowed, is fitted between the movable iron core 7 and the spring receiving portion 54 and is interposed therebetween.

A slide body 60 is provided at the center of the contact frame 6 in the vertical direction. Near the upper part of the slide body 60, there are provided contacts 61 projecting from both sides. The contact 61 is urged downward or upward by a spring 63. Terminal groups 11 and 12 each including a plurality of sets of terminals are provided on the left and right sides of the upper part of the upper case 1. Further, when the movable iron core 7 is attracted to the fixed iron core 4 by excitation of the excitation coil 52, the contact frame 6 slides downward, and the contact 6
1 and the fixed contact 62 are in contact with or separated from each other, and each set of terminals is in a closed state or an open state.

(Operation) FIG. 7 is an explanatory diagram of a method for detecting the presence or absence of a buffer member inside the electromagnetic contactor. The operation of the present embodiment will be described with reference to FIGS. The stopper 58 provided on the coil bobbin 5 includes the engaging member 25,
26 is provided at a position slightly lower than the tip portion. Therefore,
For example, even if a flathead screwdriver or the like used when disassembling the upper case 1 and the lower case 2 enters the gap between the engagement hole 16 and the distal ends of the engagement members 25 and 26, the stopper 58 does not hit. Accordingly, the claw portions 250 and 260 of the engagement members 25 and 26 can be sufficiently pushed into the inside while preventing the engagement members 25 and 26 from being damaged by the stopper 58, so that the engagement can be easily released. .

A cushioning member 3 is provided at the bottom of the lower case 2.
The inspection hole 27 is provided in a portion corresponding to. As shown in FIG. 7, the terminal members 91 and 92 provided in the detection device 9 are inserted into the inspection holes 27, and the distal ends thereof are connected to the internal member (the buffer member 3).
Alternatively, the terminal members 91 and 92 are brought into contact with the fixed iron core 4) to
The presence or absence of a buffer member in the electromagnetic contactor can be detected by detecting the electrical conductivity between the two.

That is, if no current is detected between the terminal members 91 and 92, the terminal member is in contact with the non-conductive buffer member 3, and the buffer member 3 is connected to the lower case 2 and the fixed iron core. It can be seen that it is housed between the first and fourth.
In addition, when the buzzer 93 sounds and the conductivity is detected,
The terminal members 91 and 92 are in contact with the fixed iron core 4 which is a conductor (the state of FIG. 7), the buffer member 3 is not housed, and the electromagnetic contactor A is defective. Understand. Note that the present invention is not limited to the illustrated embodiment, and various modifications are possible within the scope of the claims.

[0031]

The present invention has the above configuration and has the following effects. (A) In the case of an electromagnetic contactor in which a stopper for stopping the engaging member to prevent damage is provided only in the range from the distal end to the proximal end of the engaging member, for example, disassemble both cases. Even if a flathead screwdriver or the like used in the operation enters the gap between the engagement hole and the tip of the engagement member, it does not hit the stopper. Therefore, the claw portion of the engagement member can be sufficiently pushed into the inside while preventing the engagement member from being damaged by the stopper, so that the engagement can be easily released.

(B) In the case where the stopper is provided on the coil bobbin, since the stopper comes into contact with the back of the claw and serves as a fulcrum, the pushing force by a driver or the like can be increased or decreased with respect to the bending strength of the claw. Can be pushed into.

(C) In the case of an electromagnetic contactor in which an inspection hole through which a terminal member provided in the detection means can be inserted is provided in a portion of the case corresponding to the buffer member, the terminal member is inserted through the inspection hole. The presence or absence of the buffer member in the electromagnetic contactor can be detected by contacting the tip with the internal member and detecting the conductivity between the terminal members. That is, if the conductivity is not detected between the terminal members, the terminal member is in contact with the non-conductive buffer member, and the buffer member is housed between the case and the fixed iron core. Understand. In addition, when the conductivity is detected, it means that the terminal member is in contact with the fixed iron core as the conductor, the buffer member is not housed, and the electromagnetic contactor is defective. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an electromagnetic contactor according to the present invention.

FIG. 2 is an explanatory view showing a structure of an engagement member and a stopper of the electromagnetic contactor shown in FIG.

FIG. 3 is an exploded explanatory view of a lower case, a buffer member, a fixed iron core, and a coil bobbin of the electromagnetic contactor shown in FIG. 1;

FIG. 4 is a plan view showing a state in which a buffer member, a fixed iron core, and a coil bobbin are accommodated in a lower case.

FIG. 5 is a bottom view of the lower case.

FIG. 6 is a side view of the lower case.

FIG. 7 is an explanatory diagram of a method for detecting the presence or absence of a buffer member inside an electromagnetic contactor.

FIG. 8 is an explanatory view showing a structure of an engagement member and a stopper of a conventional electromagnetic contactor.

FIG. 9 is an explanatory view showing a state in which an engaging member of a conventional electromagnetic contactor is being pushed by a flathead screwdriver.

[Explanation of symbols]

 A Electromagnetic contactor 1 Upper case 11, 12 Terminal group 13 Left wall part 14 Engagement hole 15 Right wall part 16 Engagement hole 2 Lower case 20 Housing part 21 Left wall part 22 Engaging member 220 Claw part 23 Right wall part 24 Housing part 241, 242 Side wall part 25, 26 Engaging member 250, 260 Claw part 27 Inspection hole 3 Buffer member 4 Fixed iron core 41 Core part 42, 43 Contact part 44 Insertion hole 45 Receiving plate 5 Coil bobbin 50 Coil frame 51 Tubular Part 510 Through-hole 52 Excitation coil 53 Buffer spring 54 Spring receiving part 55 Terminal block 56 Coil terminal 57 Spring stopper 58 Stopper 6 Contact frame 60 Slide body 61 Contact 62 Fixed contact 63 Spring 7 Movable iron core 71 Core 72 Contact part 73 Buffer spring 9 Detecting device 91, 92 Terminal member 93 Buzzer

Continued on the front page (56) References Japanese Utility Model Sho 54-95464 (JP, U) Japanese Utility Model Sho 58-73524 (JP, U) Japanese Utility Model Sho 61-172419 (JP, U) Japanese Utility Model Sho 57-67325 (JP) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 50/30 H01H 50/02 H01H 9/02 F16B 19/00

Claims (5)

(57) [Claims] An upper case and a lower case are provided. One of the two cases is provided with an engagement member having a claw portion, and the other case is provided with an engagement hole in which the claw portion is engaged. A stopper that engages or disengages the claw and the engagement hole to assemble or disassemble the two cases, and stops the engagement member so that the engagement member does not bend more than a required amount toward the inside; An electromagnetic contactor comprising: the electromagnetic contactor, wherein the stopper is provided only in a range from a distal end to a proximal end of the engagement member. . 2. The electromagnetic contactor according to claim 1, wherein a stopper is provided on the coil bobbin. 3. An electromagnetic contactor having a non-conductive buffer member between a case and a fixed iron core as a conductor, wherein the electromagnetic contactor corresponds to the buffer member in the case. An electromagnetic contactor characterized in that an inspection hole through which a terminal member provided in the detection means can be inserted is provided in a portion to be inspected. 4. An upper case and a lower case, wherein one of the two cases has an engagement member having a claw portion, and the other case has an engagement hole with which the claw portion engages. A stopper that engages or disengages the claw and the engagement hole to assemble or disassemble the two cases, and stops the engagement member so that the engagement member does not bend more than a required amount toward the inside; An electromagnetic contactor comprising a buffer member, which is a nonconductor, between the one or the other case and the fixed iron core, which is a conductor, wherein the electromagnetic stopper has the stopper, An inspection hole which is provided so as to correspond only to a range from the distal end portion to the proximal end portion of the joint member, and which allows a terminal member provided in the detection means to pass through a portion corresponding to the buffer member in the one or other case. It is characterized by having been provided That, electromagnetic contactor. 5. A method for detecting the presence or absence of a buffer member inside an electromagnetic contactor in manufacturing an electromagnetic contactor having a non-conductive buffer member between a case and a fixed iron core as a conductor. In this method, an inspection hole through which a terminal member provided in the detection means can be inserted is provided in a portion of the case corresponding to the buffer member,
The terminal member is inserted into the inspection hole so that the tip portion abuts on the internal member, and the presence or absence of a buffer member in the electromagnetic contactor is detected by detecting the conductivity between the terminal members. A method of detecting the presence or absence of a buffer member inside an electromagnetic contactor.