JPH0255896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic contactor with a latch that mechanically holds the electromagnetic contactor using a latch mechanism.

[Conventional technology]

Examples of electromagnetic contactors with a latch that are closed by the excitation of a closing coil and held closed by a latch mechanism after closing are disclosed in Japanese Patent Application Laid-Open No. 55-43742 and Japanese Utility Model Application No. 53-61673. Are known.

FIG. 5 is a longitudinal sectional view of a conventional magnetic contactor with a latch disclosed in the above-mentioned Japanese Patent Application Laid-open No. 55-43742.
In the figure, 102 and 103 are fixed contacts, 104
106 is a movable contact, 106 is a closing electromagnet, 106a is a movable iron core, 125 is an interlocking rod, 127 is a holding lever, and 28 is a mechanical holding mechanism, which is composed of a spring 130, a holding plate 131, and the like. In this conventional example, the excitation of the closing electromagnet 106 causes the connecting rod 125 connected to the movable iron core 106a to move in the direction of arrow B, so that the movable contact 104 is connected to the fixed contact 10.
2,103, and this interlocking rod 125
A holding lever 127 pin-coupled to rotates in the direction of arrow K, and a holding plate 131 is in contact with the end surface of the holding lever 127.
The claw 131b is detached, the holding plate 131 rotates in the direction of arrow G, and the claw 131b engages the lever end 127c, and the mechanical holding mechanism 12
8 restricts rotation of the holding plate 131 in one direction, thereby mechanically holding the holding lever 127 in place.

In this conventional example, since one end of the holding lever 127 is pivotally attached to a pivot 127b fixed to the base 101, when moving the movable iron core 106a,
A connecting rod 125 connected to this movable iron core 106a
Since the connecting portion 127a with the lever 127 moves in an arc around the pivot 127b, the connecting rod 125 cannot move linearly in the direction of the arrow AB, and is in movable contact with the pair of fixed contacts 102 and 103. The contact of the child 104 became unstable, which adversely affected contact wear due to turning on and cutting off the load current.

FIG. 6 shows another conventional example disclosed in Japanese Utility Model Application Publication No. 53-63673, and in the figure, 201 is a closing coil, and 202 is an armature, which corresponds to the movable iron core 106a in FIG. 5. 203 is a fixed iron core, and 206 is a cross bar, which corresponds to the connecting rod 125. 207 is a movable contact, 209 is a base, 21
1 is a fixed contact, 214 is an operating arm, 216 is a lever, and 221 is a tripping armature.
Due to the excitation of the closing coil 201, the cross bar 206 engaged with the armature 202 is actuated, and the movable contact 207 comes into contact with the fixed contact 211. The lever 216 rotates via the arm 214, and the tip of the lever 216 is supported by the lever receiving portion 223 of the tripping armature 221 that is in contact with the lever 216, so that the closing state is mechanically maintained.

In this conventional example, the crossbar 206 moves linearly due to the action of the actuating arm 214, but due to the presence of the actuating arm 214, it is structurally in direct contact with the lever 216 and the end 220 of this lever 216. Since the latch mechanism composed of the tripping armature 221 and the like is located below the fixed core 204 and the closing coil 201,
Since the pair of operating arms 214 are located on both sides of the closing coil 201, the height and width of the main body of the device are increased.

[Problem that the invention seeks to solve]

A lever whose middle part is pivoted at a substantially right angle to a connecting rod (hereinafter referred to as a crossbar), one end is pivoted to a fixed fulcrum shaft, and the other end is restrained by a mechanical holding mechanism (hereinafter referred to as a latch mechanism). In a conventional magnetic contactor with a latch, the pivot point between the crossbar and the lever makes a radial movement around the fulcrum shaft at one end of the lever during closing and tripping operations. is unable to move in a straight line,
There are problems in that opening and closing of the main contacts may be hindered, and in the case where the crossbar and the lever are pivotally connected via an actuating arm, the presence of this actuating arm makes it difficult to adjust the height and There were problems such as the large width.

This invention was made in order to solve the above-mentioned problems, and provides a small and compact electromagnetic contactor with a latch that allows the crossbar to move linearly correctly during closing and tripping operations. With the goal.

[Means for solving problems]

An electromagnetic contactor with a latch according to the present invention includes a movable core that is placed opposite to a fixed core and opens and closes a contact via a crossbar, an intermediate portion of which is pivotally supported by the movable core or the crossbar, and one end of the movable core that opens and closes contacts via a crossbar. and a lever pivotally connected to a rotatable connecting body,
The other end of this lever is provided with a latch receiver that is attached to move on a guide and a hook that is attached to engage when the latch receiver reaches a predetermined position. The movable iron core is configured to be able to move toward the end when rotating as the movable iron core operates.

[Effect]

The lever according to the present invention has an intermediate portion pivotally supported by at least one of the movable iron core and the cross bar, and rotates about a pivot with the connecting body at one end, and this pivot is a fixed fulcrum of the connecting body. The hook engages with a latch receiver pivotally connected to the other end of the lever, so that the lever can move toward its end, and the movable iron core is actuated. During the accompanying rotation of the lever, the pivot point at the intermediate portion of the lever is always held on the center line of the sliding groove of the cross bar provided on the main body base, and the cross bar moves inside the sliding groove. Move back and forth.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. In FIG. 1, 1 is a movable contact;
1a and 1b are fixed contacts, 2 is a cross bar that holds the movable contact 1, 3 is a movable core that is fixed to the cross bar 2 via a movable core pin 4, and 5 is a movable core pin 4 that passes through the intermediate portion. A pair of levers with holes provided therein are provided so as to be pivotally supported by the movable core pins on both sides in the stacking direction of the movable core 3, and a connecting body 6 is rotatably attached to one end thereof by a screw 7. The connecting body 6 is rotatably held by a shaft 9 supported by a base 8 of the main body. Reference numeral 10 denotes a latch receiver rotatably attached to the other end of the lever 5 with a screw 11. The latch receiver 10 is provided with a hook portion 58 that engages with a hook 18, which will be described later. The portion 58 is provided with protrusions (not shown) on both sides thereof that are slidable in the groove 13 provided in the latch base 12, which constitutes a guide. The latch base 12 is fixed to the latch 14 with a screw mounting plate 15,
Since the latch mounting plate 14 is fixed to the rail plate 16 with screws (not shown), and the rail plate 16 is further fixed to the base 8 with screws 17 shown in FIG. It will be fixed. 18 is the shaft 1 on the latch base 12
9 is a hanger rotatably attached; 20 is a groove provided in the hanger 18; 21 is a tripping movable iron core whose shaft portion 22 is inserted into the groove 20;
23 is a tripping coil that has a columnar hole into which the tripping movable iron core 21 is inserted, and drives this movable ironcore; 24 is a yoke plate provided outside the tripping coil 23 so as to close one side of the columnar hole; 25
A spring is provided between the yoke plate 24 and the tripping iron core 21, and the tripping iron core 21 is attached to the above-mentioned hanger 18.
This applies force to the side. In addition, the latch mounting plate 1
4. A magnetic path is formed between the tripping iron core 21 and the yoke plate 24. Further, 26 is a fixed core facing the movable core 3, and 27 is a closing coil that is housed in a coil case 28 and wound around the fixed core 26, and is fixed to the rail plate 16 together with the fixed core 26 and the coil case 28. There is. 29 is a self-demagnetizing switch that quickly cuts off the current of the closing coil 27; 30 is an operating plate that opens and closes the self-demagnetizing switch 29; one end is inserted into a groove 31 formed in the latch base 12;
The other end is the auxiliary crossbar 3 of the self-demagnetizing switch 29.
It is in contact with 2. And the central bent part 3
A shaft 35 connected to the hanger 18 in the hole 34 provided in 3.
is inserted, whereby the actuating plate 30 is rotatably held relative to the latch base 12. In addition, in FIG. 2, 8a is a sliding groove of the cross bar 2.

Next, the electrical connection configuration will be explained using FIG. 4. The closing coil 27 is connected in series with the contact portion 52 of the self-demagnetizing switch 29, and when the electromagnetic contactor is mechanically held, the contact portion 52 is opened and demagnetized. The tripping coil 23 is also connected in series with a normally open contact 55 of an auxiliary contact 54 operating in parallel with the main contact portion 53 so that it opens and is demagnetized when the mechanical retention of the magnetic contactor is tripped. It is configured.

Next, the operation of the electromagnetic contactor with the above configuration will be explained. FIG. 1 shows the open state after the latch mechanism has been released, and FIG. 3 shows the held state held by the latch mechanism.

For convenience of explanation, the operation of changing from the open state to the holding state will be referred to as the closing operation, and the operation of changing from the holding state to the open state will be referred to as the tripping operation, and the closing operation will be explained first.

In FIG. 1, when the closing coil 27 is excited, the movable core 3 is attracted to the fixed core 26 against the spring pressure of a return spring (not shown), moves in the direction of arrow A, and is attached to the base 8 of the main body. The contact points of the movable contact 1 and the fixed contacts 1a and 1b come into contact via the cross bar 2 which slides in the sliding groove 8a, and one end of the lever 5 and the connecting body 6 move in the direction of arrow B about the screw 7. The other end of the lever 5 and the latch receiver 10 are moved into the groove 13 of the latch base 12.
Move in the direction of arrow C using as a guide. When the movable iron core 3 is attracted to the fixed iron core 26 and the corner 56 of the latch receiver 10 comes off from the corner 57 of the hanger 18, the hanger 18 moves in the direction of arrow D around the shaft 19 and releases the hook of the latch receiver 10. At section 58, hanger 18
The tip portion 59 of the is inserted. The movement of the hanger 18 is performed by a spring 25 and an actuating plate 3 via a tripping core 21.
0, by the biasing force of the spring 43 via the auxiliary crossbar 32.

The shaft 35 connected to the hanger 18 rotates in the direction of arrow D similarly to the hanger 18, and the shaft 3
An actuating plate 30 connected to the latch base 12 rotates in the direction of arrow E around the groove 31 of the latch base 12. When the tip of the actuating plate 30 rotates in the direction of arrow E, the spring 4
The auxiliary crossbar 32, which is biased at 3, is shown by arrow E.
Moving in the direction from the fixed contact 39 to the movable contact 40
is released. When the contact portion 52 opens, the closing coil 27 is demagnetized and the movable core 3 is separated from the fixed core 26 by the action of a return spring (not shown).
Move in the direction opposite to arrow A. As the movable iron core 3 moves, the latch receiver 10 moves in the direction opposite to the direction of arrow C, but as shown in FIG. Since the latch receiver 10 is locked by the hook 18, the crossbar 2 is mechanically held to complete the closing operation.

Next, the tripping operation will be explained.

In FIG. 3, when the trip coil 23 connected in series with the normally closed contact 55 in the closed circuit state is excited, the trip iron core 21 is attracted to the yoke plate 24 against the spring pressure of the spring 25, and is attracted by the arrow F move in the direction. The hook 18 connected to the trip iron core 21 rotates in the direction of arrow G, and the hook 18 is disengaged from the latch receiver 10, so that the engagement is released. Once disengaged, a return spring (not shown) causes the
The latch receiver 10 is moved in the direction of arrow H using the groove 13 of the latch base 12 as a guide, and the lever 5 is moved in the direction of arrow H and J.
The connecting body 6 moves in the direction of arrow J, the movable core 3 moves in the direction of arrow K, and the crossbar 2 moves in the direction of arrow K using the sliding groove 8a as a guide, and returns to the open state shown in FIG. . During the movement of the crossbar 2, the normally open contact 55 opens to demagnetize the tripping coil 23, and due to the movement of the hook 18, the actuating plate 30,
The auxiliary crossbar 32 moves in the direction of arrow L to return the contact portion 52 to the closed state.

Since the electromagnetic contactor with a latch according to the present invention is constructed as described above, the fulcrum, that is, the pivot point 7 of the connecting body 6 is connected to the lever 5 in order to rotate the lever 5.
When rotates, it can move in the direction of arrow B in Figure 1,
Therefore, the crossbar 2 that opens and closes the contacts 1a and 1b
can move smoothly on a straight line.

In addition, in this embodiment, a pair of levers 5 are arranged on both sides of the movable core 3, the middle part of the levers 5 is pivotally supported by a movable core pin 4 that connects the crossbar 2 and the movable core 3, and one end is Since the connecting body 6 is pivotally mounted with the latch receiver 10 being sandwiched at the other end, the force acting on the latch receiver 10 due to the operation of the rotating iron core 3 during the closing operation is equal to the force acting on the latch receiver 10 at the other end. In order to be transmitted by dividing the lever 5 evenly,
A bending moment in the axial direction of the movable core pin 4 does not act. Therefore, when the cross bar 2 reciprocates in the sliding groove 8a provided in the base 8, the component acting on the cross bar 2 via the movable iron core pin 4 in a direction perpendicular to the direction of the reciprocating movement. There is almost no force, and therefore, the frictional force on the sliding surface between the cross bar 2 and the sliding groove 8a of the base 8 is extremely small, allowing smooth sliding. As a result, the contact between the contacts during opening and closing operations is improved, and the wear caused by the friction between the sliding surfaces of the cross bar 2 and the base 8 is also reduced, and the frictional force of the sliding surfaces is reduced. The excitation power to the input coil is also reduced, improving the efficiency of the device.

〔Effect of the invention〕

As described above, according to the present invention, the intermediate portion of the lever is pivotally connected to at least one of the movable iron core and the cross bar, one end is rotatable via the connecting body, and the other end is rotatably connected. The structure is such that the lever is latched by engaging the attached latch receiver with the hanger, so the lever can move freely toward the end, and the crossbar smoothly reciprocates to open and close the contacts. Moreover, since a special space is not required for arranging the lever, there is no risk of increasing the size of the lever.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an open state of an electromagnetic contactor with a latch which is an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - - of Fig. FIG. 4 is an electrical connection diagram of an electromagnetic contactor with a latch which is an embodiment of the present invention; FIG. 5 is a cross-sectional view of a conventional electromagnetic contactor with a latch; FIG. 6 is a cross-sectional view of a conventional magnetic contactor with a latch, which is different from FIG. 5. In the figure, 1 is a movable contact, 1a and 1b are fixed contacts, 2 is a cross bar, 3 is a movable core, 4 is a movable core pin, 5 is a lever, 6 is a connecting body, 8 is a base,
8a is a crossbar sliding groove, 10 is a latch receiver, 1
2 is a latch base, 13 is a groove, 18 is a hanger, 2
1 is a tripping core, 23 is a tripping coil,
26 is a fixed iron core. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A movable core that is disposed opposite to a fixed core and opens and closes contacts via a crossbar, a connection whose intermediate portion is pivotally supported by the movable core or the crossbar and whose one end is rotatable. The lever has a lever pivotably mounted on the body, and the other end of the lever has a latch receiver mounted to move on a guide and engaged when the latch receiver reaches a predetermined position. 1. An electromagnetic contactor with a latch, characterized in that the lever is provided with a hanger, and the lever is movable toward the end when the movable iron core rotates due to the operation of the movable iron core. 2. The electromagnetic contactor with a latch according to claim 1, wherein the levers are arranged in pairs on both sides of the movable iron core. 3. The electromagnetic contactor with a latch according to claim 1 or 2, wherein the pivot of the intermediate portion of the lever is a movable core pin that connects the movable core and the crossbar.