JP2020042912A - Auxiliary contact unit - Google Patents

Abstract

To provide an auxiliary contact unit including an auxiliary circuit terminal part, capable of preventing a contact plate part of a conductive terminal plate from tilting due to elastic force of an elastic member, when connecting a wire to the conductive terminal plate.SOLUTION: An auxiliary contact unit 1 includes an auxiliary circuit terminal part 20a. The auxiliary circuit terminal part 20a includes a wire insertion port 21a formed in a terminal cover 12, a conductive terminal plate 23a, and an elastic member 22a for pushing the wire W, inserted into an upper case 11, to a contact plate part 29 of the conductive terminal plate 23a by elastic force. The upper case 11 is provided with a support part 11j located at a back side of the contact plate part 29 of the conductive terminal plate 23a, in a direction in which the elastic force acts, the lower case 13 is provided with a support plate part 13b for supporting the back side of the contact plate part 29, by entering between the contact plate part 29 and the support part 11j, and a terminal cover 12 is provided with a fixing part 12c for fixing the support plate part 13b and the support part 11j while clamping from the front side and the back side in the direction in which the elastic force acts.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an auxiliary contact unit mounted on an electromagnetic contactor.

An auxiliary contact unit may be mounted on an electromagnetic contactor that opens and closes a current path. The auxiliary contact unit generally includes a first auxiliary circuit terminal provided on one side of the unit case main body, a second auxiliary circuit terminal provided on the other side of the unit case main body, and an inner side of the unit case main body. And an auxiliary contact portion. The auxiliary contact portion has an auxiliary movable contact, a first auxiliary fixed contact connected to the one auxiliary circuit terminal, and a second auxiliary fixed contact connected to the other auxiliary circuit terminal. Then, the auxiliary movable contact operates in conjunction with the contact portion of the electromagnetic contactor, and the first auxiliary fixed contact and the second auxiliary fixed contact are opened and closed.
Then, for example, an electric wire connected to the power supply side is connected to the one-side auxiliary circuit terminal portion, and an electric wire connected to, for example, the load side is connected to the other-side auxiliary circuit terminal portion.

2. Description of the Related Art As an electromagnetic contactor to which an auxiliary contact unit of this type is mounted, for example, the one shown in Patent Document 1 is conventionally known.
The auxiliary contact unit disclosed in Patent Literature 1 includes a one-side auxiliary circuit terminal provided on one side of a unit case main body, an other-side auxiliary circuit terminal provided on the other side of the unit case main body, and a unit case main body. An auxiliary contact portion is provided inside. The one-side auxiliary circuit terminal portion and the other-side auxiliary circuit terminal portion have the same configuration, and are respectively screwed to the internally threaded tab terminal portion fixed to the unit case body and the internally threaded tab terminal portion. A screw terminal part. The threaded terminal section includes a terminal plate and a male screw attached to the terminal plate. Then, the crimp terminal connected to the end of the electric wire is sandwiched between the female screwed tab terminal portion and the terminal plate of the screwed terminal portion, thereby being connected to the female screwed tab terminal portion. .

On the other hand, in recent years, a spring terminal including an elastic member for elastically holding an electric wire as shown in Patent Document 2 has been adopted for electric devices such as a circuit breaker and an electromagnetic contactor.
A spring terminal disclosed in Patent Literature 2 includes an electric wire insertion port provided in a case of an electric device, and a conductive terminal plate arranged in the case. The conductive terminal plate has a contact plate at one end along a direction in which the electric wire is inserted into the case from the electric wire insertion opening. The spring terminal includes an elastic member that presses the electric wire inserted into the case toward the contact plate with elastic force. In this spring terminal, when the electric wire is inserted into the case from the electric wire insertion opening, the electric wire is pressed against the contact plate by the elastic force of the elastic member, thereby connecting the electric wire to the conductive terminal plate.

JP 2011-154865 A Japanese Patent No. 5539809

By the way, in recent years, there has been a demand for adopting a spring terminal as shown in Patent Document 2 for one side auxiliary circuit terminal portion and another side auxiliary circuit terminal portion of an auxiliary contact unit as shown in Patent Document 1, for example.
Here, when a spring terminal as shown in Patent Document 2 is employed for the one side auxiliary circuit terminal portion and the other side auxiliary circuit terminal portion of the auxiliary contact unit, the electric wire inserted into the case is electrically conductive by the elastic force of the elastic member. It is pressed against the contact plate of the terminal plate. Therefore, when the electric wire is connected to the conductive terminal plate, the contact plate portion of the conductive terminal plate may fall down due to the elastic force of the elastic member, and an appropriate electric wire holding force may not be obtained.

  Accordingly, the present invention has been made to solve this conventional problem, and an object thereof is that when a wire is connected to a conductive terminal plate, the contact plate portion of the conductive terminal plate falls down due to the elastic force of the elastic member. It is an object of the present invention to provide an auxiliary contact unit having an auxiliary circuit terminal portion, which can prevent the occurrence of the above.

  In order to solve the above problem, an auxiliary contact unit according to one embodiment of the present invention is an auxiliary contact unit including an auxiliary circuit terminal portion in a case mounted on an electromagnetic contactor, wherein the case includes an upper case and an upper case. A terminal cover attached to the upper case from above, and a lower case attached to the upper case from below and having a unit side connection surface to the electromagnetic contactor, wherein the auxiliary circuit terminal portion is attached to the terminal cover. The formed wire insertion port, a conductive terminal plate provided with a contact plate portion at one end along a direction in which the wire is inserted into the upper case from the wire insertion port, and the wire is inserted into the upper case. An elastic member that presses the electric wire against the contact plate with elastic force, wherein the upper case is located on the back side of the contact plate of the conductive terminal plate in the direction in which the elastic force acts. A support portion is provided, a support plate portion is provided in the lower case, between the contact plate portion and the support portion, and supports a back side of the contact plate portion, and the terminal cover is provided in the lower case. The gist of the present invention is that a fixing portion is provided for sandwiching and fixing the supporting plate portion and the supporting portion provided on the upper case from the front side and the back side in the direction in which the elastic force acts.

  ADVANTAGE OF THE INVENTION According to the auxiliary contact unit which concerns on this invention, when an electric wire is connected to a conductive terminal board, the contact board part of a conductive terminal board is provided with the auxiliary circuit terminal part which can prevent falling by the elastic force of an elastic member. The auxiliary contact unit can be provided.

It is a perspective view showing the state where the auxiliary contact unit concerning one embodiment of the present invention was attached to the electromagnetic contactor. FIG. 2 is an exploded perspective view of the auxiliary contact unit shown in FIG. It is the perspective view which looked at the auxiliary contact unit shown in FIG. 1 from diagonally upper front. It is the perspective view which looked at the auxiliary contact unit shown in FIG. 1 from diagonally upper rear. It is the perspective view which looked at the auxiliary contact unit shown in FIG. 1 from diagonally forward and downward. It is the perspective view which looked at the auxiliary contact unit shown in FIG. 1 from diagonally lower rear. It is sectional drawing which cut | disconnected the auxiliary contact unit shown in FIG. 1 along the front-back direction. It is the perspective view which looked at the upper case 11 from the diagonally upper front. FIG. 2 is a perspective view of a conductive terminal plate used in the auxiliary contact unit shown in FIG. It is the perspective view which looked at the auxiliary contact unit from the diagonally lower front, and has shown the movable hook part in the disassembled state. It is the perspective view which looked at the hook part main body from diagonally forward and downward. It is the perspective view which looked at the hook part main part from back diagonally upward. It is sectional drawing which shows the state in which the movable claw of the hook part main body was engaged with the hook hole. FIG. 2 is an explanatory diagram showing an outline of a wire tension test in a state where the auxiliary contact unit shown in FIG. 1 is mounted on an electromagnetic contactor. It is a perspective view showing the state where an auxiliary contact unit concerning a reference example was attached to an electromagnetic contactor. FIG. 16 is an exploded perspective view of the auxiliary contact unit shown in FIG. FIG. 16 is a perspective view of the auxiliary contact unit shown in FIG. It is the perspective view which looked at the auxiliary contact unit shown in FIG. 15 from diagonally upper rear. It is the perspective view which looked at the auxiliary contact unit shown in FIG. 15 from diagonally forward and downward. It is the perspective view which looked at the auxiliary contact unit shown in FIG. 15 from diagonally lower rear. It is sectional drawing which cut | disconnected the auxiliary contact unit shown in FIG. 15 along the front-back direction. FIG. 16 is a perspective view of a conductive terminal plate used in the auxiliary contact unit shown in FIG. It is the perspective view which looked at the auxiliary contact unit from the diagonally lower front, and has shown the movable hook part in the disassembled state. It is the perspective view which looked at the hook part main body from diagonally forward and downward. It is the perspective view which looked at the hook part main part from back diagonally upward. It is sectional drawing which shows the state in which the movable claw of the hook part main body was engaged with the hook hole. It is explanatory drawing which shows the outline | summary of the electric wire tension test in the state which attached the auxiliary contact unit shown in FIG. 15 to the electromagnetic contactor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The embodiments described below exemplify an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, arrangement, and the like of the component parts. It is not specified in the following embodiment. Also, the drawings are schematic. Therefore, it should be noted that the relationship between the thickness and the planar dimension, the ratio, and the like are different from the actual ones, and the drawings include portions having different dimensional relationships and ratios.

FIG. 1 shows a state in which the auxiliary contact unit 1 is mounted on the electromagnetic contactor 2.
Here, the electromagnetic contactor 2 opens and closes a current path, and includes a substantially rectangular parallelepiped case body 5 extending in the front-rear direction, the left-right direction, and the up-down direction. The electromagnetic contactor 2 includes a front terminal portion 3a and a rear terminal portion 3b provided on a front side and a rear side of the case body 5, respectively, and a front coil terminal provided on a front side and a rear side of the case body 5, respectively. A portion 4a and a rear coil terminal portion 4b are provided. Further, inside the case body 5, a contact portion including a movable contact (not shown), a fixed contact (not shown) connected to each of the front terminal portion 3a and the rear terminal portion 3b, and an electromagnet not shown driving the contact portion The unit is housed. The contact portion is housed in an arc-extinguishing chamber (not shown), and this arc-extinguishing chamber is covered by an arc-extinguishing cover 6 mounted on the case body 5.

  Here, the arc-extinguishing cover 6 is formed in a rectangular plate shape extending in the front-rear direction, the left-right direction, and the up-down direction, and has an upper surface serving as a main body-side connection surface 6a for connecting the auxiliary contact unit 1. A plurality of first hook holes 7a and second hook holes 7b (see FIG. 13) for mounting the auxiliary contact unit 1 are formed on the main body side connection surface 6a. As shown in FIGS. 1 and 13, the first hook 7a is formed at a position close to the long side edge of the front side of the arc-extinguishing cover 6, and the second hook hole 7b is formed as shown in FIG. The arc extinguishing cover 6 is formed at a position closer to the long side edge of the rear side.

In addition, the auxiliary contact unit 1 includes a case 10 mounted on the main body side connection surface 6a of the electromagnetic contactor 2, as shown in FIGS. The auxiliary contact unit 1 includes a plurality of (four in the present embodiment) front auxiliary circuit terminal portions 20a provided on the case 10 and a plurality of (four in the present embodiment) rear sides. An auxiliary circuit terminal portion 20b is provided. Further, the auxiliary contact unit 1 includes an auxiliary contact portion (not shown) provided inside the case 10.
As shown in FIGS. 1 to 7, the case 10 includes an upper case 11, a terminal cover 12 attached to the upper case 11 from above, and a lower case 13 attached to the upper case 11 from below.

  As shown in FIG. 8, the upper case 11 is formed in a substantially rectangular parallelepiped shape extending in the front-back direction, the left-right direction, and the up-down direction. The upper case 11 has a plurality of (four in the present embodiment) front conductive terminal plate accommodating spaces 11a on the front side and a plurality (four in the present embodiment) of rear conductive terminals on the rear side. A terminal board accommodation space 11b is provided. Each of the front conductive terminal plate housing spaces 11a and each of the rear conductive terminal plate housing spaces 11b are arranged in a pair at the front and rear. In each front conductive terminal plate housing space 11a, a later-described front elastic member 22a and a front conductive terminal plate 23a which constitute the front auxiliary circuit terminal portion 20a are housed. Further, a rear elastic member 22b and a rear conductive terminal plate 23b to be described later, which constitute the rear auxiliary circuit terminal portion 20b, are stored in each rear conductive terminal plate housing space 11b.

  The plurality of front conductive terminal plate accommodating spaces 11a and the plurality of rear conductive terminal plate accommodating spaces 11b are partitioned by a first partition wall 11c extending in the left-right direction. The plurality of front conductive terminal plate housing spaces 11a are arranged in a row along the left-right direction of the upper case 11, and the adjacent front conductive terminal plate housing spaces 11a are partitioned by a second partition wall 11d. Each front conductive terminal plate housing space 11a is open on the front side. The plurality of rear conductive terminal plate housing spaces 11b are also arranged in a line along the left-right direction of the upper case 11, and the adjacent rear conductive terminal plate housing spaces 11b are partitioned by a third partition wall 11e. I have. Each rear conductive terminal plate housing space 11b is open at the rear side.

In each front conductive terminal plate accommodating space 11a, two sets of first press-fit projections 11f and second press-fit projections 11g extend forward from the first partition wall 11c. Also, in each rear conductive terminal plate accommodating space 11b, although not shown, two sets of first press-fit projections 11f and second press-fit projections 11g extend rearward from the first partition wall 11c from the first partition wall 11c. ing.
The first partition wall 11c corresponding to each front conductive terminal plate housing space 11a and the first partition wall 11c corresponding to each rear conductive terminal plate housing space 11b are provided with a press-fit hole 11h and a connection plate slit 11i. Is formed.

The terminal cover 12 is formed in a shape that covers the upper case 11 and is attached to the upper case 11 from above. As shown in FIGS. 2 and 7, a front-side wire insertion port 21a is formed at a position of the terminal cover 12 corresponding to the front-side conductive terminal plate housing space 11a formed in the upper case 11. A rear wire insertion opening 21b is formed at a position corresponding to the rear conductive terminal plate housing space 11b formed in the upper case 11 of the terminal cover 12. The front wire insertion opening 21a communicates with the front conductive terminal plate housing space 11a, and the rear wire insertion opening 21b communicates with the rear conductive terminal plate housing space 11b.
Further, the lower case 13 includes an upper case housing portion 13a for housing a lower portion of the upper case 11 and an auxiliary contact portion (not shown), and is attached to the upper case 11 from below. The lower surface of the upper case housing portion 13a is a unit-side connection surface 13c that connects the electromagnetic contactor 2 by contacting the main body-side connection surface 6a of the electromagnetic contactor 2.

  Next, each of the front auxiliary circuit terminal portion 20a and the rear auxiliary circuit terminal portion 20b will be described. The front auxiliary circuit terminal portion 20a employs a so-called spring terminal. As shown in FIGS. 2 and 7, the front electric wire insertion port 21a formed in the terminal cover 12, the front conductive terminal plate 23a, and the front elastic And a member 22a. The rear auxiliary circuit terminal portion 20b also employs a spring terminal, and as shown in FIG. 7, the rear electric wire insertion opening 21b formed in the terminal cover 12, the rear conductive terminal plate 23b, And a side elastic member 22b. The rear conductive terminal plate 23b has a symmetrical shape with the front conductive terminal plate 23a, and the rear elastic member 22b has a symmetrical shape with the front elastic member 22a.

Here, as shown in FIGS. 7 and 9, the front conductive terminal plate 23 a is formed in a substantially rectangular shape, and is bent downward from the rear end of the substrate portion 24 extending in the front-rear direction and the left-right direction. A substantially rectangular hanging plate portion 25 is provided. The front conductive terminal plate 23a is formed by punching and bending a conductive metal plate.
Here, at the right end of the substrate portion 24, a press-fitting portion 28 that is press-fitted between one set of the first press-fitting protrusion 11f and the second press-fitting protrusion 11g of the upper case 11 is provided. At the left end of the substrate portion 24, a press-fit portion 28 that is press-fitted between the other set of the first press-fit protrusion 11f and the second press-fit protrusion 11g is provided.

Further, the front conductive terminal plate 23a includes a press-fitting plate portion 26 formed by bending backward from the left end of the hanging plate portion 25, and a connecting plate portion 27 formed by bending rearward from the right end of the hanging plate portion 25. ing. The press-fitting plate portion 26 is press-fitted and fixed to a press-fitting hole 11h formed in the upper case 11. The connection plate 27 is inserted into a connection plate slit 11 i formed in the upper case 11.
The front conductive terminal plate 23a includes a substantially rectangular contact plate portion 29 which is bent upward from a front end of the substrate portion 24 (one end of the conductive terminal plate in claim 1). When the front conductive terminal plate 23a is fixed to the upper case 11, the electric wire W (see FIG. 14) is inserted into the upper case 11 from the front electric wire insertion opening 21a, as shown in FIG. Extending along the direction. A slit 29c extending vertically downward from the upper edge is formed at the center of the upper edge of the contact plate portion 29 in the left-right direction, and a first contact plate portion 29a and a second contact plate portion 29b are formed with the slit 29c interposed therebetween. Have been. A first contact 29aa extending in the left-right direction and projecting rearward is formed on the first contact plate portion 29a, and a second contact 29ba extending in the left-right direction and projecting rearward is formed on the second contact plate portion 29b. Are formed.

  Further, as shown in FIG. 7, the front elastic member 22a includes a substantially rectangular plate-shaped fixing portion 22aa extending in the vertical direction and fixed to the first partition wall 11c in the front conductive terminal plate housing space 11a. Further, the front elastic member 22a includes a wire holding portion 22ac extending obliquely downward and forward from the upper end of the fixed portion 22aa via the curved portion 22ab. The front elastic member 22a is formed by punching and bending an elastic metal plate. The wire holding portion 22ac is a wire inserted between the contact plate portion 29 in each front conductive terminal plate housing space 11a of the upper case 11 and the wire holding portion 22ac from a front wire insertion opening 21a formed in the terminal cover 12. W is pressed against the first contact 29aa and the second contact 29ab of the contact plate portion 29 by elastic force. Thereby, the electric wire W is held. When the electric wire W is pressed against the first contact 29aa and the second contact 29ab of the contact plate portion 29, the electric wire W is connected to the front conductive terminal plate 23a.

When the electric wire W is connected to the front conductive terminal plate 23a and the vicinity of the curved portion 22ab is pressed by a tool or the like from above, the electric wire holding portion 22ac is displaced and the pressing force on the electric wire W is released, and the electric wire W is released. Can be pulled out.
The auxiliary contact portion includes an auxiliary movable contact (not shown) that is linked to the contact portion of the electromagnetic contactor 2. Further, the auxiliary contact portion includes a first auxiliary fixed contact connected to the connection plate portion 27 of the front conductive terminal plate 23a of the front auxiliary circuit terminal portion 20a, and a rear conductive terminal plate 23b of the rear auxiliary circuit terminal portion 20b. A second auxiliary fixed contact connected to the connection plate.

  Here, the electric wire W inserted from the front electric wire insertion opening 21a formed in the terminal cover 12 between the contact plate portion 29 and the front elastic member 22a in each front conductive terminal plate accommodating space 11a of the upper case 11, The elastic force of the front elastic member 22a presses the first contact 29aa and the second contact 29ab of the contact plate portion 29 of the front conductive terminal plate 23a. In addition, the electric wire W inserted from the rear electric wire insertion opening 21b formed in the terminal cover 12 between the contact plate portion in each rear conductive terminal plate accommodating space 11b of the upper case 11 and the rear elastic member 22b is Similarly, the elastic member is pressed against the first contact and the second contact of the contact plate of the rear conductive terminal plate 23b by the elastic force of the rear elastic member. For this reason, when the electric wire W is connected to the front conductive terminal plate 23a or the rear conductive terminal plate 23b, the contact plate portion 29 of the front conductive terminal plate 23a or the rear conductive terminal plate 23b becomes the front elastic member 22a or the rear elastic member. It may fall down due to the elastic force of the member 22b and may not be able to obtain an appropriate electric wire holding force.

  Therefore, in the auxiliary contact unit 1 according to the present embodiment, as shown in FIG. 7, the direction in which the elastic force acts on the contact plate portion 29 of the front-side conductive terminal plate 23a on the upper case 11 (forward direction). Are provided on the back side, that is, on the front side. Further, the upper case 11 is provided with a plurality of rear support portions 11j located on the rear side of the contact plate portion of the rear conductive terminal plate 23b in the direction in which the elastic force acts (rear direction), that is, on the rear side. I have. As shown in FIG. 8, the front-side support portion 11j is provided so as to bridge between the second partition walls 11d adjacent in the left-right direction in each front-side conductive terminal plate accommodation space 11a. The rear support portion 11j is provided so as to bridge between the third partition walls 11e adjacent in the left-right direction in each rear conductive terminal plate housing space 11b.

  Also, as shown in FIG. 7, the lower case 13 enters between the contact plate portion 29 of the front conductive terminal plate 23a and the front support portion 11j, and supports the rear side of the contact plate portion 29, that is, the front side. A plurality of front support plates 13b are provided. 7, similarly, as shown in FIG. 7, the lower case 13 enters between the contact plate portion of the rear conductive terminal plate 23b and the rear support portion 11j, and the rear side of the contact plate portion, that is, the rear side. A plurality of rear support plates 13b are provided to support the sides. As shown in FIGS. 2 to 7, the front support plate 13b extends upward from the upper edge of the front end of the upper case accommodating portion 13a, and enters between the second partition walls 11d adjacent in the left-right direction. The front side of the storage space 11a is closed. As shown in FIGS. 2 to 7, the rear support plate 13b extends upward from the upper edge of the rear end of the upper case accommodating portion 13a and enters between the third partition walls 11e adjacent in the left-right direction. The rear side of the rear conductive terminal plate housing space 11b is closed.

  Further, the terminal cover 12 has a front support plate portion 13b provided on the lower case 13 and a front support portion 11j provided on the upper case 111 on the front side (rear side) in the direction in which the elastic force by the front elastic member 22a acts. ) And a plurality of fixing portions 12c that are sandwiched and fixed from the rear side (front side). Each fixing portion 12c elastically presses the front support plate portion 13b from the front side (rear side) to the rear side (front side) in the direction in which the elastic force acts, and the front support portion 11j. And a support plate portion 12b that is supported on the rear side (front side) in the direction in which the force acts. Similarly, the terminal cover 12 has a rear support plate portion 13b provided on the lower case 13 and a rear support portion 11j provided on the upper case 111 in a direction in which the elastic force of the rear elastic member 22b acts. There are provided a plurality of fixing portions 12c which are sandwiched and fixed from the front side (front side) and the back side (rear side) of the hologram. Each fixing portion 12c includes an inclined surface 12a that presses the rear support plate portion 13b from the front side (front side) to the rear side (rear side) in the direction in which the elastic force acts, and the rear support portion 11j. And a support plate 12b that is supported on the rear side (rear side) in the direction in which the elastic force acts.

At the time of assembling the auxiliary contact unit 1, the front conductive terminals are stored in the front conductive terminal plate accommodating spaces 11a of the upper case 11 with the terminal cover 12 and the lower case 13 removed, with respect to the front auxiliary circuit terminal portion 20a. The front elastic member 22a is inserted from above the plate accommodation space 11a. Then, the fixing portion 22aa of the front elastic member 22a is fixed to the first partition wall 11c. Next, the front conductive terminal plate 23a is inserted into each front conductive terminal plate accommodating space 11a from the front thereof, and the press-fit portion 28 of the front conductive terminal plate 23a is press-fitted between the first press-fit protrusion 11f and the second press-fit protrusion 11g. And fix it. At the same time, the press-fit plate 26 is press-fitted into the press-fitting hole 11h formed in the upper case 11. Similarly, for the rear auxiliary circuit terminal portion 20b, the rear elastic member 22b and the rear conductive terminal plate 23b are fixed to the upper case 11.
Next, the auxiliary contact portion is incorporated into the upper case 11, and the lower case 13 is attached from below the upper case 11. At this time, the front support plate 13b provided on the lower case 13 is inserted between the contact plate 29 of the front conductive terminal plate 23a and the front support 11j, as shown in FIG. Further, as shown in FIG. 7, the rear support plate 13b provided in the lower case 13 is inserted between the contact plate of the rear conductive terminal plate 23b and the rear support 11j.

Further, the terminal cover 12 is attached to the upper case 11 from above the upper case 11. At this time, the front fixing portion 12c causes the front support plate portion 13b provided on the lower case 13 and the front support portion 11j provided on the upper case 11 to face the front side in the direction in which the elastic force is exerted by the front elastic member 22a. (Back side) and the back side (front side) to fix. Also, the rear fixing portion 12c allows the rear support plate portion 13b provided on the lower case 13 and the rear support portion 11j provided on the upper case 11 to move in a direction in which the elastic force of the rear elastic member 22b acts. It is sandwiched and fixed from the front side (front side) and the back side (rear side).
Thereby, the auxiliary contact unit 1 is completed.
Then, with the auxiliary contact unit 1 attached to the electromagnetic contactor 2, the electric wire W is inserted from the front electric wire insertion port 21a into the contact plate portion 29 and the electric wire holding portion 22ac in each front conductive terminal plate accommodating space 11a of the upper case 11. Insert between Then, the inserted electric wire W is pressed against the first contact 29aa and the second contact 29ab of the contact plate portion 29 of the front conductive terminal plate 23a by the electric wire holding portion 22ac by the elastic force of the front elastic member 22a, so that the front conductive terminal plate is formed. 23a.

At this time, the front support plate 13b provided in the lower case 13 supports the rear side of the contact plate 29, that is, the front side, so that the contact plate 29 is moved forward by the elastic force of the front elastic member 22a. Do not fall down. The fixing portion 12c provided on the terminal cover 12 causes the front support plate portion 13b provided on the lower case 13 and the front support portion 11j provided on the upper case 11 to face the front side (the rear side) in the direction in which the elastic force acts. Side) and the back side (front side). For this reason, the front support plate 13b is also securely fixed, and does not fall forward due to the elastic force of the front elastic member 22a. Thereby, the contact plate portion 29 can be reliably prevented from falling down, and an appropriate electric wire holding force can be obtained.
Although the electric wire W is also connected to the rear conductive terminal plate 23b, its operation is the same as that of the case where the electric wire W is connected to the front conductive terminal plate 23a.

Next, a configuration and a method for mounting the auxiliary contact unit 1 to the electromagnetic contactor 2 will be described with reference to FIGS. 1, 5 and 6, and FIGS. 10 to 13.
As shown in FIGS. 5 and 6, a pair of fixed hook portions 31 are provided on the unit-side connection surface 13 c, which is the lower surface of the lower case 13, at the front long side edge portion at a predetermined interval from each other. ing. Each fixed hook portion 31 is provided with a claw portion 31a that faces away from the unit-side connection surface 13c of the lower case 13. When the lower case 13 of the auxiliary contact unit 1 is mounted on the arc-extinguishing cover 6 of the electromagnetic contactor 2 as shown in FIGS. It engages with a first hook hole 7a formed in the main body side connection surface 6a.

The unit-side connecting surface 13c is provided with a movable hook portion 32 at the rear long side edge.
As shown in FIGS. 5, 6, and 10, the movable hook portion 32 includes a hook portion main body 33 and a linear spring. The movable hook portion 32 is formed on the unit-side connecting surface 13c and accommodates the hook portion main body 33 so as to be slidable in the front-rear direction, and the movable hook portion 32 is formed on the unit-side connecting surface 13c and accommodates the linear spring 34. And a spring accommodating concave portion 36.
Here, as shown in FIG. 10, the main body accommodating recess 35 is formed so as to extend forward from the long side edge on the rear side of the unit-side connecting surface 13 c of the lower case 13, and the rear side of the main body accommodating recess 35 is provided. Is covered by a stop 37a. A slit 37b penetrating in the front-rear direction is formed in the stop portion 37a.

  The spring accommodating recess 36 extends in the left-right direction perpendicular to the front-rear direction which is the sliding direction of the hook portion main body 33 on the front end side of the main body accommodating recess 35, and the straight accommodating straight ends are accommodated at both left and right ends of the spring accommodating recess 36. A pair of locking portions 36a for locking both ends of the spring 34 are provided. The spring accommodating recess 36 is formed in a linear shape that is inclined from the left end toward the center in the left-right direction so as to move away from the long side edge on the rear side, and the rear side from the right end toward the center in the left-right direction. Is formed in an inclined straight line away from the long side edge. The linear spring 34 is accommodated in the spring accommodating recess 36, and both ends in the left-right direction are locked by a pair of locking portions 36a.

As shown in FIGS. 10 to 13, the hook portion main body 33 is engaged with a slide plate 33 a that is slidably received in the main body receiving recess 35 in the front-rear direction, and protrudes downward from the lower surface of the slide plate 33 a. A part 33b. At the lower end of the engaging portion 33b, a movable claw 33c capable of engaging with a second hooking hole 7b formed in the main body side connecting surface 6a of the electromagnetic contactor 2 projects rearward, which is a sliding direction. Is formed. The hook portion main body 33 includes a pressed piece 33f provided on one side (rear surface) 33d of the slide plate 33a on the side (rear side) from which the movable claw 33c protrudes. The pressed piece 33f is provided at the rear end of the connecting piece 33e extending rearward from one side surface 33d of the slide plate 33a. Further, the hook portion main body 33 is provided on the other side surface (front surface) 33g side opposite to the one side surface 33d of the slide plate 33a, and engages with the central portion of the linear spring 34 in the length direction and lifts the linear spring 34 up. It has a spring engagement holding piece 33h for prevention.
As shown in FIG. 11, the other side surface (front surface) 33g of the slide plate 33a is flush with a surface (front surface) 33ba opposite to the side of the engagement portion 33b from which the movable claw 33c protrudes. Is formed.

Further, as shown in FIGS. 11 and 12, the position of the center of gravity of the hook portion main body 33 is shifted from the other side (front) 33g side of the slide plate 33a to one side (rear) of the slide plate 33a. An overlay portion 33i is formed to be shifted to the 33d side (the A side in FIG. 13).
As shown in FIGS. 5, 6, 10, and 13, the slide plate 33a of the hook portion main body 33 is such that the pressed piece 33f has a long side edge on the rear side of the unit side connection surface 13c of the lower case 13. It is slidably housed in the body housing recess 35 in the front-rear direction so as to protrude rearward from the portion. At this time, the connecting piece 33e of the hook portion main body 33 passes through the inside of the slit 37b formed in the stop portion 37a in the front-rear direction. Further, the spring engagement holding piece 33h of the hook portion main body 33 is engaged with the central portion in the length direction (left and right direction) of the linear spring 34 housed in the spring housing recess 36.

In the initial state in which the slide plate 33a of the hook body 33 is housed in the body housing recess 35, the elastic force of the linear spring 34 acts on the hook body 33 backward as shown in FIGS. Then, the rear surface of the engaging portion 33b of the hook portion main body 33 contacts the stop portion 37a. As a result, the hook portion main body 33 is prevented from coming off backward. Further, in a state where the rear surface of the engaging portion 33b of the hook portion main body 33 is in contact with the stop portion 37a, the overlay portion 33i enters above the stop portion 37a as shown in FIG. Is stopped.
When the pressed piece 33f is pressed forward from the initial state in which the slide plate 33a of the hook body 33 is housed in the body housing recess 35, the hook body 33 moves forward against the elastic force of the linear spring 34. . At this time, the elastic restoring force of the linear spring 34 elastically deformed in an arc shape acts on the hook portion main body 33 rearward.

Next, when attaching the auxiliary contact unit 1 to the electromagnetic contactor 2, as shown in FIG. 13, first, the claw portions 31a of the fixed hook portions 31 provided on the unit side connection surface 13c of the lower case 13 are attached. , And engages with a first hook hole 7 a formed in the main body side connecting surface 6 a of the arc extinguishing cover 6.
On the other hand, with respect to the movable hook portion 32, the movable claw 33c is formed on the main body side connection surface 6a of the arc extinguishing cover 6 in a state where the pressed piece 33f is pressed forward to move the hook portion main body 33 forward. Into the second hook hole 7b. At this time, the movable claw 33c is not engaged with the second hook hole 7b. Further, the elastic restoring force of the linear spring 34 elastically deformed in an arc shape acts on the hook portion main body 33 rearward.

Next, the pressed state on the pressed piece 33f is released. Then, since the elastic restoring force of the linear spring 34 elastically deformed in an arc shape acts on the hook portion main body 33 rearward, the hook portion main body 33 automatically moves rearward, as shown in FIG. Thus, the movable claw 33c is engaged with the second hook hole 7b.
Thereby, the auxiliary contact unit 1 can be mounted on the electromagnetic contactor 2.
Then, in the auxiliary contact unit 1 according to the present embodiment, the other side surface (front surface) 33g of the slide plate 33a is opposite to the side on which the movable claw 33c of the engaging portion 33b projects, as shown in FIG. It is formed so as to be flush with the side surface (front surface) 33ba. Therefore, there is no heavy object protruding from the surface (front surface) 33ba of the engaging portion 33b on the other side surface (front surface) 33g of the slide plate 33a. As shown in FIGS. 11 and 12, the center of gravity of the hook body 33 is shifted from the other side (front surface) 33g of the slide plate 33a to one side surface (rear surface) of the slide plate 33a. An overlay portion 33i is formed to be shifted to the 33d side (the A side in FIG. 13).

For this reason, as shown in FIG. 14, when the electric wire W is pulled, as shown in FIG. 13, the movable claw 33c of the hook part main body 33 is on the rear side, that is, the movable claw 33c indicated by the arrow B is secondly hooked. It turns to the locking portion side of the arc extinguishing cover 6 in the hole 7b. Thus, the hook body 33 can be effectively prevented from coming off.
When removing the auxiliary contact unit 1 from the electromagnetic contactor 2, the pressed piece 33f is pressed forward to move the hook portion main body 33 forward to disengage the movable claw 33c. The auxiliary contact unit 1 may be removed from the electromagnetic contactor 2 by performing the above operation.

Next, in order to explain the effect of the auxiliary contact unit 1 according to the present embodiment, an auxiliary contact unit according to a reference example will be described with reference to FIGS.
FIG. 15 shows a state where the auxiliary contact unit 101 according to the reference example is mounted on the electromagnetic contactor 102.
Here, the electromagnetic contactor 102 has the same basic configuration as the electromagnetic contactor 2, and includes a substantially rectangular parallelepiped case body 105 extending in the front-rear direction, the left-right direction, and the up-down direction. The electromagnetic contactor 102 is provided on a front terminal portion 103a and a rear terminal portion (not shown) provided on the front side and the rear side of the case main body 105, respectively, and on the front side and the rear side of the case main body 105, respectively. And a front coil terminal portion 104a and a rear coil terminal portion (not shown). Further, inside the case main body 105, there are a movable contact (not shown), a contact portion including a fixed contact (not shown) connected to each of the front terminal portion 103a and the rear terminal portion, and an electromagnet unit (not shown) for driving the contact portion. And are stored. The contact portion is housed in an arc-extinguishing chamber (not shown), and this arc-extinguishing chamber is covered by an arc-extinguishing cover 106 mounted on the case body 105.

  Here, the arc-extinguishing cover 106 is formed in a rectangular plate shape extending in the front-rear direction, the left-right direction, and the up-down direction, and has an upper surface serving as a main body-side connecting surface 106a that connects the auxiliary contact unit 101. A plurality of first hook holes 107a and second hook holes 107b (see FIG. 26) for mounting the auxiliary contact unit 101 are formed on the main body side connection surface 106a. The first hook 107a is formed at a position close to the long side edge of the front side of the arc-extinguishing cover 106, as shown in FIGS. 15 and 26, and the second hook hole 107b is formed as shown in FIG. The arc extinguishing cover 106 is formed at a position close to the long side edge on the rear side.

As shown in FIGS. 15, 16 and 21, the auxiliary contact unit 101 includes a case 110 mounted on the main body side connection surface 106a of the electromagnetic contactor 102. The auxiliary contact unit 101 includes four front auxiliary circuit terminal portions 120a and four rear auxiliary circuit terminal portions 120b provided on the case 110, and an auxiliary contact portion (not shown) provided inside the case 110. ing.
As shown in FIGS. 15 to 21, the case 110 includes an upper case 111, a terminal cover 112 attached to the upper case 111 from above, and a lower case 113 attached to the upper case 111 from below.

  As shown in FIG. 16, the upper case 111 is formed in a substantially rectangular parallelepiped shape extending in the front-rear direction, the left-right direction, and the up-down direction, and has four front terminal receiving spaces 111a on the front side and four rear terminal spaces on the rear side. A side terminal housing space 111b is provided. Each of the front terminal receiving spaces 111a and each of the rear terminal receiving spaces 111b are arranged in a pair at the front and rear. Each front terminal accommodating space 111a accommodates a later-described threaded terminal portion 121a and a female threaded tab terminal portion 122a that constitute the front auxiliary circuit terminal portion 120a. Similarly, a screw terminal section 121b and a female screw tab terminal section 122b, which will be described later, and constitute the rear auxiliary circuit terminal section 120b are also accommodated in each rear terminal accommodating space 111b.

  The front terminal housing space 111a and the rear terminal housing space 111b are partitioned by a first partition wall 111c extending in the left-right direction. The front terminal receiving spaces 111a are arranged in a line along the left-right direction of the upper case 11, and the adjacent front terminal receiving spaces 111a are partitioned by a second partition wall 111d. Each front terminal housing space 111a is open on the front side. The rear terminal housing space 111b is also arranged in a line along the left-right direction of the upper case 111, and the adjacent rear terminal housing space 111b is partitioned by a third partition wall 111e. Each rear terminal accommodation space 111b is open on the rear side.

The terminal cover 112 is formed in a shape that covers the upper part of the upper case 111 and is attached to the upper case 111 from above.
Further, the lower case 113 is attached to the upper case 111 from below, and accommodates a lower portion of the upper case 111 and an auxiliary contact portion (not shown). The lower surface of the lower case 113 is a unit-side connecting surface 113a that connects the electromagnetic contactor 102 by contacting the main body-side connecting surface 106a of the electromagnetic contactor 102.

  Next, each of the front auxiliary circuit terminal section 120a and the rear auxiliary circuit terminal section 120b will be described. As shown in FIGS. 16 and 21, the front auxiliary circuit terminal section 120a includes a threaded terminal section 121a and a female threaded tab terminal section 122a, unlike the front auxiliary circuit terminal section 20a of the present embodiment. As shown in FIG. 21, the rear auxiliary circuit terminal section 120b includes a threaded terminal section 121b and a female threaded tab terminal section 122b. The rear threaded terminal portion 121b has the same configuration as the front threaded terminal portion 121a, and the rear female threaded tab terminal portion 122b has the same configuration as the front female threaded tab terminal portion 122a. Therefore, the description of each is omitted.

Here, the screw terminal portion 121a includes a terminal plate 121aa and a male screw 121ab attached to the terminal plate 121aa.
Further, as shown in FIG. 22, the tab terminal portion 122 a with a female thread has a rectangular plate-like substrate portion 123 extending in the up-down direction and the left-right direction, and a flat-plate-like female screw bent rearward from the upper end of the substrate portion 123. And a terminal plate portion 124. In addition, the tab terminal portion 122 a with female threads is provided with a bent piece 125 extending downward from the lower end of the board part 123 and further bent backward, and a connection plate 126 extending downward from a lower edge of the bent piece 125.

In addition, a rectangular opening 123a is formed at the center of the substrate 123, and a first press-fit projection 123b that projects upward from a lower edge of the opening 123a is provided. Also, a second press-fit projection 125a is provided on the upper edge of the bent piece 125. Further, a female screw portion 124a is formed in the center of the female screw terminal plate portion 124.
As shown in FIG. 21, the tab terminals 122 a with female threads are inserted into the front terminal receiving spaces 111 a of the upper case 111 from the front side so that the first press-fit protrusions 123 b and the second press-fit protrusions 125 a receive the respective front terminal housings. It is pressed into the wall formed in the space 111a. As a result, the tab terminal portion 122a with female threads is fixed to the upper case 111.

  When the front side auxiliary circuit terminal section 120a is thus composed of the threaded terminal section 121a and the female threaded tab terminal section 122a, the electric wire W (see FIG. 27) connected to the front side auxiliary circuit terminal section 120a is A crimp terminal (not shown) connected to the tip is used. When connecting the electric wire W, the crimp terminal connected to the electric wire W is placed on the female screw terminal plate portion 124 of the female screw tab terminal portion 122a fixed to the upper case 111. Then, the male screw 121ab is screwed into the female screw portion 124a through the crimp terminal while sandwiching the crimp terminal with the terminal plate 121aa of the screw terminal portion 121a. Thereby, the electric wire W is connected to the front-side auxiliary circuit terminal portion 120a.

Further, in order to remove the electric wire W from the front auxiliary circuit terminal portion 120a, the screw engagement of the threaded terminal portion 121a with the male screw 121ab may be released.
On the other hand, when connecting the electric wire W to the rear auxiliary circuit terminal portion 120b, similarly, the crimp terminal connected to the electric wire W on the female screw terminal plate portion of the female screw tab terminal portion 122b fixed to the upper case 111. Put. Then, the male screw 121bb may be screwed into the female screw portion of the female threaded tab terminal portion 122b through the crimp terminal while sandwiching the crimp terminal with the terminal plate 121ba of the screw terminal portion 121b.

Here, in the front auxiliary circuit terminal portion 120a and the rear auxiliary circuit terminal portion 120b in the auxiliary contact unit 101 according to the reference example, tab terminals with female screws fixed to the screw terminal portions 121a and 121b and the upper case 111. The electric wires W are connected by the parts 122a and 122b. Therefore, the contact plate portion 29 does not fall down like the front auxiliary circuit terminal portion 20a and the rear auxiliary circuit terminal portion 20b employing the spring terminals in the auxiliary contact unit 1 according to the present embodiment, and an appropriate wire holding force. Can be obtained.
However, in the case of the front auxiliary circuit terminal portion 120a and the rear auxiliary circuit terminal portion 120b in the auxiliary contact unit 101 according to the reference example, it is necessary to connect a crimp terminal to the end of the electric wire W. In addition, screwing work is required to connect the electric wire W to the front auxiliary circuit terminal portion 120a and the rear auxiliary circuit terminal portion 120b, which is troublesome.

On the other hand, in the case of the front auxiliary circuit terminal portion 20a and the rear auxiliary circuit terminal portion 20b in the auxiliary contact unit 1 according to the present embodiment, it is not necessary to connect the crimp terminal to the tip of the electric wire W. In addition, the connection of the electric wire W to the front auxiliary circuit terminal portion 20a and the rear auxiliary circuit terminal portion 20b is performed by connecting the electric wire W to the contact plate portion 29 in each front conductive terminal plate accommodating space 11a of the upper case 11 from the electric wire insertion port 21a. It is only required to be inserted between the holding portion 22ac and it is simple.
In addition, in the case of the front auxiliary circuit terminal portion 20a and the rear auxiliary circuit terminal portion 20b in the auxiliary contact unit 1 according to the present embodiment, since the spring terminals are employed, the above-described drawbacks are concerned. However, as described above, the contact plate portion 29 is reliably prevented from falling down by the front elastic member 22a and the rear elastic member 22b, and an appropriate electric wire holding force is obtained.

Next, a configuration and a method for mounting the auxiliary contact unit 101 according to the reference example on the electromagnetic contactor 102 will be described with reference to FIGS. 15, 19, 20, and 23 to 26.
As shown in FIGS. 19 and 20, the unit-side connecting surface 113a, which is the lower surface of the lower case 113, has a pair of fixed hook portions on the front long side edge like the lower case 13 according to the present embodiment. 131 are provided so as to protrude at a predetermined interval from each other. Each fixed hook portion 131 is provided with a claw portion 131a that faces in a direction away from the unit-side connection surface 113a of the lower case 113. As shown in FIG. 26, when the lower case 113 of the auxiliary contact unit 101 is mounted on the arc extinguishing cover 106 of the electromagnetic contactor 102, the claw 131a of each fixed hook 131 is connected to the main body side of the arc extinguishing cover 106. It engages with the first hook hole 107a formed in the surface 106a.

The unit-side connection surface 113a is provided with a movable hook portion 132 at the rear long side edge.
As shown in FIGS. 19, 20, and 23, the movable hook portion 132 includes a hook portion main body 133 and a linear spring 134, similarly to the movable hook portion 32 in the auxiliary contact unit 1 according to the present embodiment. ing. The movable hook portion 132 is formed on the unit-side connecting surface 113a and accommodates the hook portion main body 133 so as to be slidable in the front-rear direction. The movable hook portion 132 is formed on the unit-side connecting surface 113a and accommodates the linear spring 134. And a spring accommodating concave portion 136.

Here, as shown in FIG. 23, the main body accommodating recess 135 is formed so as to extend forward from the long side edge of the rear side of the unit-side connecting surface 113 a of the lower case 113, and the rear side of the main body accommodating recess 135. Is covered by a stop 137a. A slit 137b penetrating in the front-rear direction is formed in the stop portion 137a.
Further, the spring accommodating recess 136 extends on the front end side of the main body accommodating recess 135 in the left-right direction orthogonal to the front-rear direction, which is the sliding direction of the hook portion main body 133, and the left and right ends of the spring accommodating recess 136 accommodate straight A pair of locking portions 136a for locking both ends of the spring 134 are provided. The spring accommodating recess 136 is formed in a linear shape that is inclined from the left end toward the center in the left-right direction and away from the long side edge on the rear side, and is formed from the right end toward the center in the left-right direction. Is formed in an inclined straight line away from the long side edge. The linear spring 134 is accommodated in the spring accommodating recess 136, and both ends in the left-right direction are locked by a pair of locking portions 136a.

  As shown in FIGS. 23 to 25, the hook portion main body 133 is engaged with a slide plate 133a which is slidably accommodated in the main body accommodating recess 135 in the front-rear direction, and protrudes downward from the lower surface of the slide plate 133a. A part 133b. At the lower end of the engaging portion 133b, a movable claw 133c capable of engaging with a second hooking hole 107b formed in the main body side connecting surface 106a of the electromagnetic contactor 102 projects rearward in the sliding direction. Is formed. The hook portion main body 133 includes a pressed piece 133e provided on one side (rear surface) 133g of the slide plate 133a on the side (rear side) on which the movable claw 133c protrudes. Further, the hook portion main body 133 is provided on the other side surface (front surface) 133h opposite to the one side surface 133g of the slide plate 133a, and engages with the center of the linear spring 134 in the longitudinal direction, and raises the linear spring 134 up. A spring engagement holding piece 133f for preventing the movement is provided. The pressed piece 133e is provided at the rear end of the connecting piece 133d extending rearward from one side surface 133g of the slide plate 133a.

Here, the other side surface (front surface) 133h of the slide plate 133a is different from the other side surface 33g of the slide plate 33a according to the present embodiment, as shown in FIG. 24, on the side where the movable claw 133c of the engagement portion 133b protrudes. It is formed so as to protrude forward with respect to the opposite surface (front surface) 133ba.
As shown in FIG. 20 and FIG. 25, one side surface (rear surface) 133g of the slide plate 133a has the rear surface of the engaging portion 133b of the hook portion main body 133 in a state in which the rear surface of the engaging portion 133b is in contact with the stop portion 137a. A retaining projection 133i that protrudes upward is formed. As a result, the hook portion main body 133 is prevented from falling off. As can be seen by comparing FIGS. 25 and 12 with reference to FIGS. 25 and 12, the retaining projection 133i is extremely smaller than the build-up portion 33i in the present embodiment.

  As shown in FIGS. 19, 20, 23, and 26, the slide plate 133a of the hook portion main body 133 is configured such that the pressed piece 133e has a long side edge on the rear side of the unit-side connection surface 113a of the lower case 113. It is slidably housed in the body housing recess 35 in the front-rear direction so as to protrude rearward from the portion. At this time, the connecting piece 133d of the hook portion main body 133 passes through the inside of the slit 137b formed in the stop portion 137a in the front-rear direction. Further, the spring engagement holding piece 133f of the hook portion main body 133 is engaged with the central portion in the length direction (left-right direction) of the linear spring 134 housed in the spring housing recess 136.

  In the initial state in which the slide plate 133a of the hook portion main body 133 is accommodated in the main body accommodating recess 135, the elastic force of the linear spring 134 acts on the hook portion main body 133 rearward as shown in FIGS. Then, the rear surface of the engaging portion 133b of the hook portion main body 133 contacts the stop portion 137a. As a result, the hook portion main body 133 is prevented from coming off backward. In a state where the rear surface of the engaging portion 133b of the hook portion main body 133 contacts the stop portion 137a, the retaining projection 133i enters above the stop portion 137a, as shown in FIG. Is stopped.

When the pressed piece 133e is pressed forward from the initial state in which the slide plate 133a of the hook part body 133 is housed in the body housing recess 135, the hook part body 133 moves forward against the elastic force of the linear spring 134. . At this time, the elastic restoring force of the linear spring 134 elastically deformed in an arc shape acts rearward on the hook portion main body 133.
Next, when attaching the auxiliary contact unit 101 to the electromagnetic contactor 102, first, as shown in FIG. 26, the claw portions 131a of the fixed hook portions 131 of the lower case 113 are connected to the main body side of the arc extinguishing cover 106. It engages with the first hook hole 107a formed in the surface 106a.

On the other hand, with respect to the movable hook portion 132, the movable claw 133c is formed on the main body side connection surface 106a of the arc extinguishing cover 106 in a state where the pressed piece 133e is pressed forward to move the hook portion main body 133 forward. Into the second hook hole 107b. At this time, the movable claw 133c is not engaged with the second hook hole 107b. Further, the elastic restoring force of the linear spring 134 elastically deformed in an arc shape acts on the hook portion main body 133 rearward.
Next, the pressed state on the pressed piece 133e is released. Then, since the elastic restoring force of the linear spring 34 elastically deformed in an arc shape acts rearward on the hook portion main body 133, the hook portion main body 133 automatically moves rearward, as shown in FIG. Thus, the movable claw 133c is engaged with the second hook hole 107b.
Thereby, the auxiliary contact unit 1 can be mounted on the electromagnetic contactor 2.

Here, in the auxiliary contact unit 101 according to the reference example, the other side surface (front surface) 133h of the slide plate 133a is different from the other side surface 33g of the slide plate 33a in the present embodiment, and the movable claw 133c of the engagement portion 133b is provided. Is formed so as to protrude forward with respect to a surface (front surface) 133ba on the opposite side to the side on which the protrudes. Therefore, there is a heavy object protruding forward from the surface (front surface) 133ba of the engaging portion 133b. Further, as shown in FIG. 25, one side (rear surface) 133g of the slide plate 133a is provided with a retaining projection 133i, but its size is extremely small compared to the build-up portion 33i in the present embodiment, and its weight is small. Is light. For this reason, as shown in FIG. 26, the position of the center of gravity of the hook portion main body 133 is closer to the front side (the C side in FIG. 26).
For this reason, as shown in FIG. 27, when the electric wire W is pulled, as shown in FIG. 26, the movable claw 133c of the hook portion main body 133 is in the front side, that is, the movable claw 133c indicated by the arrow D is in the second hook hole. At 107b, the arc-extinguishing cover 6 pivots away from the locking portion. Thereby, there is a possibility that the hook portion main body 133 may come off.

On the other hand, in the case of the auxiliary contact unit 1 according to the present embodiment, as described above, the other side (front surface) 33g of the slide plate 33a is, as shown in FIG. It is formed so as to be flush with a surface (front surface) 33ba opposite to the side on which it protrudes. Therefore, there is no heavy object protruding from the surface (front surface) 33ba of the engaging portion 33b on the other side surface (front surface) 33g of the slide plate 33a. As shown in FIGS. 11 and 12, the center of gravity of the hook body 33 is shifted from the other side (front surface) 33g of the slide plate 33a to one side surface (rear surface) of the slide plate 33a. An overlay portion 33i is formed to be shifted to the 33d side (the A side in FIG. 13).
For this reason, as shown in FIG. 14, when the electric wire W is pulled, as shown in FIG. 13, the movable claw 33c of the hook part main body 33 is on the rear side, that is, the movable claw 33c indicated by the arrow B is secondly hooked. It turns to the locking portion side of the arc extinguishing cover 6 in the hole 7b. Thus, the hook body 33 can be effectively prevented from coming off.

The embodiments of the present invention have been described above, but the present invention is not limited thereto, and various changes and improvements can be made.
For example, the support portion 11j provided on the upper case 11 may be located on the back side of the contact plate portion 29 in the direction in which the elastic force acts, and is not limited to the illustrated shape.
Further, the support plate portion 13b provided in the lower case 13 only needs to enter between the contact plate portion 29 and the support portion 11j and support the back side of the contact plate portion 29, and is not limited to the illustrated shape. Absent.
Further, the fixing portion 12c provided on the terminal cover 12 is fixed by sandwiching the support plate portion 13b provided on the lower case 13 and the support portion 11j provided on the upper case 11 from the front side and the back side in the direction in which the elastic force acts. The shape is not limited to the illustrated shape.

DESCRIPTION OF SYMBOLS 1 Auxiliary contact unit 2 Electromagnetic contactor 3a Front terminal part 3b Rear terminal part 4a Front coil terminal part 4b Rear coil terminal part 5 Case main body 6 Arc extinguishing cover 6a Main body side connecting surface 7a First hook hole 7b Second pull Hanging hole 10 Case 11 Upper case 11a Front conductive terminal plate housing space 11b Rear conductive terminal plate housing space 11c First partition wall 11d Second partition wall 11e Third partition wall 11f First press-fit protrusion 11g Second press-fit protrusion 11h Press-fit hole 11i Connection plate slit 11j Support portion 12 Terminal cover 12a Inclined surface 12b Support plate portion 12c Fixed portion 13 Lower case 13a Upper case storage portion 13b Support plate portion 13c Unit side connection surface 20a Front auxiliary circuit terminal portion (auxiliary circuit) Terminal)
20b Rear auxiliary circuit terminal (auxiliary circuit terminal)
21a Front wire insertion port (wire insertion port)
21b Rear wire insertion port (wire insertion port)
22a Front elastic member (elastic member)
22aa Fixed part 22ab Curved part 22ac Electric wire holding part 22b Rear elastic member (elastic member)
23a Front conductive terminal plate (conductive terminal plate)
23b Rear conductive terminal plate (conductive terminal plate)
24 Board part 25 Hanging plate part 26 Press-fit plate part 27 Connection plate part 28 Press-fit part 29 Contact plate part 29a First contact plate part 29aa First contact 29b Second contact plate part 29ba Second contact 31 Fixed hook part 31a Claw part 32 Movable hook part 33 Hook part main body 33a Slide plate 33b Engagement part 33c Movable claw 33d One side (rear surface) of slide plate
33e Connecting piece 33f Pressed piece 33g Other side of slide plate (front)
33h Spring engagement holding piece 33i Overlay portion 34 Linear spring 35 Main body concave portion 36 Spring concave portion 36a Locking portion 37a Stop portion 37b Slit W Electric wire

Claims (2)

An auxiliary contact unit having an auxiliary circuit terminal portion in a case attached to the electromagnetic contactor,
The case includes an upper case, a terminal cover attached to the upper case from above, and a lower case attached to the upper case from below and having a unit-side connection surface to the electromagnetic contactor,
The auxiliary circuit terminal portion includes a wire insertion port formed in the terminal cover, and a conductive terminal provided with a contact plate portion at one end along a direction in which the wire is inserted into the upper case from the wire insertion port. A plate, and an elastic member that presses the electric wire inserted into the upper case against the contact plate with elastic force,
In the upper case, a support portion of the contact plate portion of the conductive terminal plate, which is located on the back side in the direction in which the elastic force acts, is provided.
In the lower case, a support plate portion that enters between the contact plate portion and the support portion and supports a rear side of the contact plate portion is provided,
The terminal cover is provided with a fixing portion for sandwiching and fixing the supporting plate portion provided on the lower case and the supporting portion provided on the upper case from the front side and the rear side in the direction in which the elastic force acts. Auxiliary contact unit. A movable hook portion provided on a unit side connection surface of the lower case,
The movable hook portion includes a hook portion main body formed with a movable claw and a pressed piece that can be engaged with a hook hole formed in a main body side connection surface of the electromagnetic contactor, and a linear spring, The hook portion main body is slidably housed in a main body housing recess formed in the unit side connection surface, and a spring housing recess formed in the unit side connection surface orthogonal to the sliding direction of the hook portion body, and has a lengthwise direction. A structure in which an intermediate portion is engaged with the hook portion main body to accommodate the linear spring,
The hook portion main body is provided with a slide plate that slides in the main body housing concave portion, and protrudes downward from a lower surface of the slide plate, and an engagement portion formed so that the movable claw protrudes in a slide direction at a lower end side. And the pressed piece provided on one side of the slide plate on the side where the movable claw projects, and the length of the linear spring provided on the other side opposite to the one side of the slide plate. A spring engagement holding piece that engages with the direction center portion and prevents the linear spring from floating.
The other side surface of the slide plate is formed so as to be flush with a surface of the engagement portion opposite to a side on which the movable claw protrudes,
2. The auxiliary contact unit according to claim 1, wherein a built-up portion is formed on one side surface of the slide plate to shift a center of gravity of the hook portion main body from the other side surface of the slide plate to one side surface. 3. .

Images