JP2800616B2 - Auxiliary contact unit for 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 auxiliary contact unit for an electromagnetic contactor mounted on an electromagnetic contactor.

[0002]

2. Description of the Related Art FIGS. 8 and 9 are sectional views showing the structure of a mounting portion of a conventional auxiliary contact unit, wherein 1 is an auxiliary contact unit, 2 is a case, and 2a is a projection provided on the inner surface of the case 2. FIG. Reference numeral 2b denotes an inclined surface of the outer surface of the case 2, reference numeral 3 denotes a movable hook, reference numeral 3a denotes a projection provided on the movable hook 3, reference numeral 3b denotes a claw portion of the movable hook 3 protruding from the case 2, and reference numeral 3c denotes an insertion of the claw portion 3b . 3d is an engaging surface having an inclination for mounting the claw portion 3b, 3e is a leading portion of the movable hook 3 that has come out of the case 2, 4 is a fixed hook facing the movable hook 3, and 4a is a claw thereof. And 4b are inclined engagement surfaces for attaching the claw portion 4a, and 5 are projections 2a of the case 2 and movable hooks 3.
A push spring that pushes the movable hook 3 by engaging both ends thereof with the protrusion 3a, 6 is an electromagnetic contactor, 6a is a mounting surface for mounting the auxiliary contact unit, 7 is a mounting groove provided on the mounting surface 6, and 7a is Its opening, 7b is an edge, 7c is a movable hook 3
2 shows an inclined engagement surface for engaging the claw 3b of the hook 4 and the claw 4a of the hook 4.

The mounting structure of the conventional auxiliary contact unit is constructed as described above. At the time of mounting, the claw 4a of the fixed hook 4 is held while the inclined surface 2b of the case 2 is in contact with the mounting surface 6a as shown in FIG. Into the mounting groove 7 on one side and then the movable hook 3
Is pressed into the other mounting groove 7, the claw 3b is pressed.
Of the movable hook 3 slides on the edge 7b of the groove 7.
Is compressed by the pressing spring 5 and slides, and the claw portion 3b gets over the edge 7b and the engaging surfaces 3d and 7c are engaged. At this time, the claw portion 3b is pushed deep into the mounting groove 7 by the strong spring pressure of the pressing spring 5 and the inclination of the engagement surfaces 3d and 7c, and the auxiliary contact unit 1 is in a form in which the case 2 and the mounting surface 6a are pressed against each other. It is attached to the electromagnetic contactor 6 without rattling. At the time of removal, the pull-out portion 3e of the movable hook 3 protruding to the outside of the case is pryed out with, for example, a tip of a screwdriver or the like, and the hook 3b is removed while disengaging. FIG. 10 is a detailed explanatory view of the claw 3b and the drawer 3e of the movable hook 3. As shown in the drawing, the drawer 3e is fixed to the main body of the movable hook 3 , and this drawer 3
By pulling out e with the tip of a screwdriver or the like, the upper claw 3b of the movable hook 3 is disengaged from the engaging surface 7c of the mounting groove, and the auxiliary contact unit 1 is detached from the electromagnetic contactor 6.
FIG. 11 shows a drawer 3 e of the movable hook 3 at the tip of the driver 20.
It is a figure explaining how to pull out. Drawer 3e
The movable hook 3 advances in the direction of a straight arrow 22 against the stress of the pressing spring 5 by pulling out with a screwdriver as shown by an arc-shaped arrow 21, and a claw portion 3 b (FIG. ) Is disengaged from the engaging surface 7c of the mounting groove.

[0004]

Since the conventional auxiliary contact unit is constructed as described above, the movable hook 3 compresses the pressing spring 5 having a high spring pressure by the force pressing the auxiliary contact unit against the mounting surface during mounting. The claw 3b
The inclined surface 3c must climb over the edge 7b of the mounting groove 7, so that the mounting is not easy. When removing the movable hook 3, it is necessary to remove the movable hook 3 while pulling it out with the tip of the drawer 3e. It was not easy to remove. In addition, depending on the inclination angle of the engagement surfaces 3d and 7c provided for mounting without looseness, there is a problem that the engagement is easily released. Further, to rotate the auxiliary contact unit relative to the mounting surface 6a of the electromagnetic contactor as shown in FIG. 8, it is necessary to engage simultaneously the connecting portion 11 contact mechanism portion 13 of the movable that is shown in Figure 1 It was more difficult to attach the auxiliary contact unit.

[0005]

An auxiliary contact unit for an electromagnetic contactor according to a first aspect of the present invention comprises a claw 3b of a movable hook 3 protruding toward a mounting surface of a case and a mounting surface 6a of an electromagnetic contactor 6. And a pair of movable hooks 3 having claws 3b facing outward from each other in an auxiliary contact unit having a mounting groove 7 provided in A pressing spring 5 for pressing the movable hooks 3 away from each other; and a pair of windows 2 for exposing the respective operation surfaces 3f of the pair of movable hooks 3 to the outside of the case.
d, and is detachably attached to the electromagnetic contactor 6 by pressing both operation surfaces 3f.

The auxiliary contact unit for an electromagnetic contactor according to the second aspect of the present invention is the auxiliary contact unit according to the first aspect, wherein the movable hook 3 having the contact surface 3g and the operating portion projecting toward the mounting surface side of the case. 8a and contact surface 3g of movable hook 3
And a return spring 9 for pushing the locking rod 8 toward the mounting surface. When the auxiliary contact unit is mounted, the locking rod 8 is attached to the electromagnetic contactor 6. The contact surface 3g and the contact surface 8c are disengaged from each other by the mounting surface, and the claw 3b of the movable hook 3 is engaged with the mounting groove 7 of the electromagnetic contactor 6, and when the auxiliary contact unit is removed, both operation surfaces are used. 3f, the hook 3b of the movable hook 3 and the mounting groove 7 of the electromagnetic contactor 6 are disengaged from each other.
Removably attached to.

According to a third aspect of the present invention, there is provided an auxiliary contact unit for an electromagnetic contactor, wherein the locking rod of the auxiliary contact unit of the second aspect is formed integrally with a case.

[0008] The fourth electromagnetic contactor dexterity auxiliary contact unit according to claim of the present invention, each gradient is provided on the engagement surfaces of the pawl and the mounting groove of the movable hook, the angle with respect to the mounting surface of the inclined tan ^- It is formed to be ¹ μ (μ is the friction coefficient of the engagement surface) or less.

[0009]

According to the first aspect of the present invention, the movable hook 3 is pushed into the case 2 when the auxiliary contact unit is attached .
The two operation surfaces 3f exposed from the pair of windows 2d of the case 2
The auxiliary contact unit 1 is attached to the electromagnetic contactor 6 by the force of the pressing spring 5 by simply inserting the claw 3b into the mounting groove 7 of the electromagnetic contactor 6 while grasping with a finger. When the auxiliary contact unit is removed, the pair of windows 2d are opened. Both operation surfaces 3 exposed to the outside
By pressing f, the engagement between the claw 3b of the movable hook 3 and the mounting groove 7 of the electromagnetic contactor 6 is released, and the auxiliary contact unit is removed from the electromagnetic contactor 6.

[0010] In the second claim of the present invention,
At the time of mounting the auxiliary contact unit, by simply inserting the claw 3b of the auxiliary contact unit into the mounting groove 7 of the electromagnetic contactor 6, the locking rod 8 is pushed by the mounting surface of the electromagnetic contactor 6, as in the first aspect. Then, the engagement between the contact surface 3g and the contact surface 8c is released, and the claw 3b of the movable hook 3 is engaged with the mounting groove 7 of the electromagnetic contactor 6 by the force of the push spring 5, so that the auxiliary contact unit becomes electromagnetic. It is attached to the contactor 6. When the auxiliary contact unit is removed, the claw 3b of the movable hook 3 is disengaged from the mounting groove 7 of the electromagnetic contactor 6 by pressing both operation surfaces 3f, and the auxiliary contact unit is removed from the electromagnetic contactor 6. At this time, the contact surface 8c of the locking rod 8 is engaged with the contact surface 3g of the movable hook 3 by the force of the return spring 9, and returns to the initial state.

[0011] In a third aspect of the present invention,
By forming the locking rod so as to be integral with the case, the locking rod provided as an additional part is omitted, and the return bar is further provided.
Ne 9 can also be omitted.

[0012] In a fourth aspect of the present invention,
The angle of inclination between the hook claw and the engaging surface of the mounting groove is tan ^-1 μm
(Μ is the friction coefficient of the engagement surface) or less, it is possible to prevent the claw 3 b of the auxiliary contact unit from easily coming off the mounting groove 7 of the electromagnetic contactor 6.

[0013]

FIG. 1 is a perspective view showing an auxiliary contact unit according to an embodiment of the present invention, FIG. 2 is a sectional view of the auxiliary contact unit shown in FIG. 1, and FIG. FIG. In these figures, 2d is a window provided on the outer surface of the case 2 of the auxiliary contact unit 1, and 3f is exposed from this window 3d.
The operation surface of the movable hook 3 , 6 is an electromagnetic contactor, 6 b is a hole provided on the mounting surface 6 a of the electromagnetic contactor 6, 6 c is two recesses provided on the mounting surface 6 a of the electromagnetic contactor 6, and 11 is a case 2 , The connecting portion of the contact mechanism of the auxiliary contact unit 1 protruding to the mounting surface 6a side, the two protrusions 12 provided on the mounting surface of the case 2 and inserted into the two recesses 6c, and the 13 of the electromagnetic contactor 6 3 shows a contact mechanism section. Other numbers are the same as in the conventional example, but only one movable hook 3 is provided in the conventional example, but in the first embodiment, the movable hook 3 is provided in a pair,
Each of the movable hooks 3 is movable and the pressing spring 5 is
The two movable hooks 3 are pushed apart by engaging with the projections 3a provided opposite to.

The auxiliary contact unit of the first embodiment is configured as described above. When the auxiliary contact unit is mounted on the electromagnetic contactor 6 , the connecting portion 11 of the contact mechanism of the auxiliary contact unit 1 is connected to the mounting surface 6 of the electromagnetic contactor 6.
a of the contact mechanism 13 of the electromagnetic contactor 6
And the movable part of the auxiliary contact unit is linked to the movable part of the electromagnetic contactor. At this time, the two convex portions 12 of the case 2 enter the concave portions 6c of the mounting surface 6a, and the mounting position of the auxiliary contact unit 1 is determined. Specifically knob operation surface 3f of the movable hook 3 so as to push the movable hook 3 to the case 2 as shown in FIG. 3 with a finger, when the auxiliary contact unit 1 to the attachment surface 6a goes with press, two movable The inclined surface 3c provided on the claw portion 3b of the hook 3 contacts the edges 7b of the two mounting grooves 7 to guide the mounting, and the two claw portions 3b are connected to the edges 7b.
When the finger is released at a position beyond the position, the engagement surfaces 3d and 7c are engaged. This engagement is carried out in the same manner as in the conventional example by a pressing spring 5 having a strong inclination and a spring provided on the engagement surfaces 3d and 7c so that there is no play. Next, when removing the auxiliary contact unit, the operation surface 3f of the movable hook 3 exposed from the window 2d provided in the case 2 for the two hooks 3 is simultaneously grasped with a finger and pushed into the case 2 as in the case of attachment. Then, the auxiliary contact unit 1 is removed while releasing the engagement of the claw portions 3b.

Embodiment 2 FIGS. 4 and 5 are sectional views of a mounting portion of an auxiliary contact unit according to Embodiment 2 of the present invention. In these figures, 2c is a projection provided on the inner surface of the case 2, 8 is a locking rod for holding the movable hook 3, and 8a is a locking rod 8 protruding perpendicular to the case 2 on the mounting surface 6a side of the case 2. The operation portion 8b is provided with projections 8c and 3 of the locking rod 8 provided so as to face the projection 2c of the case 2.
g is a contact surface on which the locking rod 8 holds the movable hook 3. Reference numeral 9 denotes a return spring which engages both ends of the projections 3c and the projections 8b, pushes the locking rod 8 toward the mounting surface 6a, and pushes the operating portion 8a out of the case 2. The length of the contact surfaces 3g and 8c in the direction perpendicular to the mounting surface is shorter than the length of the operation portion 8a of the locking rod 8 protruding from the case 2 before mounting.
The locking rod 8, the return spring 9, and the projection 2c of the case 2 are 2
The two movable hooks 3 are similarly provided. Other configurations are the same as those of the first embodiment.

In the second embodiment, the claw 3b of the movable hook 3 is held at the position of the opening 7a of the mounting groove 7 by the locking rod 8 at the contact surfaces 3g and 8c before the mounting. When the auxiliary contact unit is mounted, it is inserted into the mounting groove 7 as it is, so that the mounting inclined surface 3c provided in the claw portion 3b of the conventional example and the first embodiment is unnecessary. During this mounting, the operating portion 8a of the locking rod 8 protruding from the case 2 hits the mounting surface 6a and is pushed into the case 2 by the mounting surface 6a while compressing the return spring 9, and the claw portion 3b is moved into the mounting groove 7a. Edge 7
abutment surface 8 holding movable hook 3 around b
c is released, the movable hook 3 is pushed outward by the pressing spring 5, and the engaging surfaces 3d and 7c are engaged in the same manner as in the first embodiment. Next, when removing the auxiliary contact unit, the operation surface 3f of the movable hook 3 is pushed out from the window 2d of the case 2 and removed as in the first embodiment.
When it is separated from the a, the operating portion 8a of the locking rod 8 is pushed by the return spring 9 and starts to protrude from the case 2 again, and becomes the same protruding state as before the mounting before the claw portion 3b comes out of the mounting groove 7 completely. After removal, the movable hook 3 is held at the position before the attachment.

Third Embodiment In the second embodiment, the locking rod 8 is provided as an additional component.
In the third embodiment, as shown in FIG. 6, the locking rod 8 is provided as a locking portion 10 integral with the case 2. When the auxiliary contact unit is mounted, the operating portion 10b protruding from the outer surface of the case 2 is pushed by the mounting surface 6a, and the supporting portion 10c of the locking portion 10 connected to the case 2 is bent,
The return spring 9 engaged with the projection 10a and the projection 2c of the case 2 is pressed into the case 2 while being compressed, and the contact surfaces 3g and 10c holding the movable hook 3 as in the second embodiment.
And the auxiliary contact unit is attached to the electromagnetic contactor body 6. In the present embodiment, the support portion 10 of the locking portion 10 is used.
If the elasticity of c is used, the return spring 9 is unnecessary.

Embodiment 4 In all the above examples, the auxiliary contact unit 1 is mounted without play, so that the claw portion 3b and the groove 7 of the mounting surface 6a as shown in FIG.
The engagement surfaces 3d and 7c are provided with an inclination, but in the present invention, the inclination angle α with respect to the mounting surface 6a is provided as in Expression 4 . For example, assuming that an external force a for pulling out the auxiliary contact unit 1 perpendicular to the mounting surface 6a is applied as shown in FIG.
Component force c that causes claw portion 3b to slide down on engagement surface 7c
Is given by equation 1. c = a · sin α (1) Further, assuming that the friction coefficient at this time is μ and the component force of the external force a perpendicular to the engagement surface 7c is b, the friction force d that opposes the component force c
Is given by equation 2. d = μ · b = μ · a · cosα (2) As given by Expression 3, if the frictional force d is equal to or greater than the component force c, the claw portion 3b does not come off due to the external force a. a · sin α <= μ · a · cos α (3) From Expression 3, the inclination angle α is obtained as in Expression 4. α <= tan ⁻¹ μ (4) That is, if the condition of Expression 4 is satisfied, the claw portion 3b is formed by frictional force.
Will not be disengaged.

[0019]

Since the present invention is configured as described above, the following effects can be obtained.

In the auxiliary contact unit according to the first aspect, a pair of movable operation surfaces facing each other are exposed from the window of the case, and the side of the hook is viewed through the window of the case on the side opposite to the mounting surface. With this configuration, the auxiliary contact unit can be easily attached and detached by pinching the operation surface of the hook with a finger, and the finger escapes when the operation surface is pinched and pushed into the case. The operability is good because the case is provided with a window. Further, after the movable contact mechanism portion and the connecting portion are connected, the pushed-in hook is released and the hook is engaged with the electromagnetic contactor, so that the mountability is good.

The auxiliary contact unit according to claims 2 and 3 is provided with a locking rod for holding the hook so that the hook claw is located at the opening of the mounting groove at the time of mounting. From the mounting surface side, and shorten the length of the contact surface holding the hook by the operating part in the same direction as the protrusion of the operating part, and push the locking rod toward the mounting surface side. The provision of the spring facilitates the attachment of the auxiliary contact unit including repetition.

In the auxiliary contact unit according to a fourth aspect of the present invention, the angle of the inclined surface provided on the engaging surface of the hook and the engaging surface of the mounting groove with respect to the mounting surface is defined as:
By setting n ⁻¹ μm or less, it is difficult for the frictional force of the engagement surface to disengage the auxiliary contact unit.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an auxiliary contact unit according to a first embodiment of the present invention and a mounting surface of the auxiliary contact unit on an electromagnetic contactor side;

FIG. 2 is a cross-sectional view showing a state before the auxiliary contact unit according to the first embodiment of the present invention is attached.

FIG. 3 is a view showing how to attach and detach an auxiliary contact unit according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a state before an auxiliary contact unit according to a second embodiment of the present invention is attached.

FIG. 5 is a cross-sectional view illustrating a state after an auxiliary contact unit according to a second embodiment of the present invention is mounted.

FIG. 6 is a sectional view showing a state before an auxiliary contact unit according to a third embodiment of the present invention is attached.

FIG. 7 is an enlarged view showing a state after mounting an auxiliary contact unit according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a state before a conventional auxiliary contact unit is attached.

FIG. 9 is a cross-sectional view showing a state after an auxiliary contact unit of a conventional example is mounted.

FIG. 10 is a detailed explanatory view of a claw portion 3b and a drawer portion 3e of a movable hook 3 in a conventional example.

FIG. 11 shows a hook 3 at the tip of a driver 20 in a conventional example.
FIG. 14 is a diagram for explaining a state in which a drawer 3e of the e is forcibly pulled out.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Auxiliary contact unit 2 Case 2a Projection 2b Inclined surface 2c Projection 2d Window 3 Movable hook 3a Projection 3b Claw 3c Inclined surface 3d Engagement surface 3e Pull-out portion 3f Operation surface 3g Contact surface 4 Fixed hook 4a Claw portion 4b Engagement surface Reference Signs List 5 push spring 6 electromagnetic contactor 6a mounting surface 6b hole 6c concave portion 7 mounting groove 7a opening 7b edge 7c engaging surface 8 locking rod 8a operating portion 8b protrusion 8c contact surface 9 return spring 10 locking portion 10a protrusion 10b operation Part 10c Support part 1Od Contact surface 11 Connection part of contact mechanism of auxiliary contact unit 12 Convex part 13 Contact mechanism part of electromagnetic contactor

Claims (4)

(57) [Claims] 1. A claw 3b of a movable hook 3 protruding toward a mounting surface of a case, and a mounting groove 7 provided on a mounting surface 6a of an electromagnetic contactor 6. The claw 3b is attached to the mounting groove 7. A pair of movable hooks 3 having claws 3b facing outward in an auxiliary contact unit to be engaged and attached to the electromagnetic contactor 6.
And a pressing spring 5 for pressing the movable hooks 3 apart from each other.
Each of the pair of movable hooks 3 has a pair of windows 2d whose operation surfaces 3f are exposed to the outside of the case, and can be detachably attached to the electromagnetic contactor 6 by pressing the both operation surfaces 3f. Characteristic auxiliary contact unit for electromagnetic contactors. 2. The auxiliary contact unit according to claim 1, wherein the movable hook 3 having a contact surface 3g, an operating portion 8a protruding toward the mounting surface side of the case, and a contact surface engaging with the contact surface 3g of the movable hook 3. A movable locking rod 8 having a contact surface 8c; and a return spring 9 for pushing the locking rod 8 toward the mounting surface. When the auxiliary contact unit is mounted, the locking rod 8 is mounted on the mounting surface of the electromagnetic contactor 6. The contact surface 3g and the contact surface 8c are disengaged from each other and the claw 3b of the movable hook 3 is engaged with the mounting groove 7 of the electromagnetic contactor 6, and when the auxiliary contact unit is removed, the two operation surfaces are used. An auxiliary contact unit for an electromagnetic contactor characterized in that the claw 3b of the movable hook 3 is disengaged from the mounting groove 7 of the electromagnetic contactor 6 by pressing 3f, thereby being detachably attached to the electromagnetic contactor 6. . 3. The auxiliary contact unit according to claim 2, wherein
An auxiliary contact unit for an electromagnetic contactor, wherein a locking rod is integrated with a case. 4. The auxiliary contact unit according to claim 1, wherein the hook claw and the engaging surface of the mounting groove are each provided with an inclination, and the angle of the inclination with respect to the mounting surface is set to ta.
An auxiliary contact unit for an electromagnetic contactor, wherein the auxiliary contact unit is less than n ^-1 μ (μ is a friction coefficient of an engagement surface).