JP2519780Y2 - Circuit breaker - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker having a micro switch as an auxiliary device.

[0002]

2. Description of the Related Art FIGS.
It is a figure which shows the conventional circuit breaker shown by the 6th publication,
3 is a vertical cross-sectional side view, FIG. 4 is an explanatory view of main parts when FIG. 3 is viewed from the left, and FIG. 5 is a perspective view showing the vicinity of the micro switch when FIG. 4 is viewed from the left.

In the figure, reference numeral 1 is a circuit breaker case, which is composed of a base 101 and a cover 102. 2 is a fixed contact 2
A stator having 01 is fixed to the base 101. Three
Is a terminal screw screwed to the stator 2, 4 is a mover having a movable contact 401 that is brought into contact with and separated from the fixed contact 201, and 5 is a base 1.
The mover 4 is opened and closed by a push plate that slides along the groove 01. 6 is a separation spring, which is used to move the movable contact 401 to the fixed contact 2
The mover 4 is urged to be separated from 01. Reference numeral 7 denotes a mechanical frame having a square shape, which supports a mechanical portion that is mounted on the base 101 and that performs opening / closing operations. 8 is a pin 9 which is removably engaged with the push plate 5 by a pin 9] and slides along the long hole of the mechanism frame 7. Reference numeral 10 denotes an operation handle, which is pivotally attached to the mechanism frame 7 by a pin 11 and has an end connected to the link 8 via a pin 12. Reference numeral 13 is a lever, which is pivotally attached to the mechanism frame 7 at the same time as the operation handle 10 by a pin 11 and receives a component force of a force generated in an engaging portion between the push plate 5 and the link 8 together with an automatic trip device (described later). The engagement between the push plate 5 and the link 8 is maintained. Reference numeral 14 is an automatic tripping device, which is a device for releasing the engagement with the lever 13 and performing an automatic tripping operation when an overcurrent or a short circuit current occurs. 15 is lever 1
The operation pin 16 provided in 3 is a micro switch as an internal accessory device, and is used as an alarm switch for activating an alarm lamp, a buzzer, etc., for example, when the breaker trips. Reference numeral 17 is a mounting screw for fixing the microswitch 16 to one side surface of the mechanism frame 7 via an insulating plate 18, 1
An actuator 9 of the micro switch 16 is engaged with the operating pin 15 and is pushed in when the operating pin 15 is in the on / off position (switch "open" state), and the operating pin 15 is in the trip position. At some point it is released (switch "closed"). Reference numeral 20 is a flexible copper stranded wire that connects one of the lead-out portions of the automatic trip device 14 and the mover 4, 21
Is a terminal plate connected to the other lead-out portion of the automatic trip device 14, and has terminal screws 22. 23 is the mechanism frame 7
A mounting base fixed to the other side surface by an attaching screw 25 via an insulating plate 24, and a micro switch 26 fixed to the mounting base 23 by an attaching screw 27, which is used as an auxiliary switch.

Next, the operation will be described. In the ON state shown in FIG. 3, the operation handle 10 is turned OFF (arrow 28
Direction), the link 8 is lifted and the mover 4 is separated by the separation spring 6 at the same time. At this time, since the push plate 5 is pushed up together with the mover 4, the pin 9 is moved to the lever 1
Rise along 3. On the contrary, since the link 8 is pushed down by the operation handle 10 during the ON operation, the mover 4 is closed against the opening spring 6 via the push plate 5.

Since the automatic trip device 14 does not operate during the above-described off operation and on operation, the lever 13 is also held in the state shown in FIG. Therefore, together with the lever 13, the operation pin 1
5 also does not move, the actuator 19 of the microswitch 16 is pushed to the operating pin 15 as shown in FIG. 3, the microswitch 16 is in the "open" state, no alarm is issued, and the other microswitch 26 Also does not work.

Next, when an abnormal current flows in the ON state shown in FIG. 3, the automatic trip device 14 operates to operate the lever 13
Is disengaged and held. Then, the push plate 5 is pushed up by the opening spring 6, and the lever 13 is rotated by the pin 9 of the rotating link 7, and the mover 4 is opened. In this trip operation, since the operation pin 15 moves upward with the rotation of the lever 13, the actuator 19 of the micro switch 16 is released from the operation pin 15, the micro switch 16 is in the “closed” state, and the alarm is issued. And
The other micro switch 26 also operates.

[0007]

In the conventional circuit breaker as described above, the micro switch 26 is mounted on the mechanism frame 7 by the mounting base 23, while the mounting base 23 is mounted on the mechanism frame 7 by the mounting screws 25. After that, the micro switch 26 is attached to the mounting base 23 with the mounting screw 27.
Since the micro switch 26 is mounted, the mounting workability of the micro switch 26 is not only poor, but also the mounting position accuracy of the micro switch 26 is poor due to the two-stage tightening with the mounting screws 25 and 27.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to obtain a circuit breaker capable of improving the mounting workability of a microswitch as a one-touch mounting and improving the mounting position accuracy of the microswitch. To aim.

[0009]

A circuit breaker according to the present invention comprises a support arm projecting laterally at a lower side of a mechanism frame for holding an opening / closing mechanism, and a groove and a notch formed on an upper surface thereof. An upper slip-out preventing hooking elastic claw protruding downwardly from the lower surface of a mounting base attached to a side surface of the mechanism frame to engage with the supporting arm, and laterally projecting upward to engage with the groove and the notch. It is provided with two mating claws for preventing the falling and preventing the lateral direction from coming off.

[0010]

In this invention, when the mount is lowered onto the side surface of the mechanism frame from above while the micro switch is mounted on the mount, the hooking elastic claws engage with the supporting arm and the hooking claws respectively form the groove and the groove. Since it engages with the notch, the catches prevent the mounting base from falling sideways from the mechanism frame in this engaged state, and the lateral dislocation of the mounting base along the mechanism frame engages with the groove. This is prevented by the hooking claws, and the mounting base is prevented from being pulled out upward by the hooking elastic claws.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a vertical sectional side view showing a mounted state, and FIG. 2 is an exploded view of a main part shown with a mounting base removed. The same or corresponding parts as those of the conventional device are designated by the same reference numerals and the description thereof will be omitted. In the figure, 29 is a supporting arm provided at the lower end of the mechanism frame 7 so as to project laterally, 30 is a groove provided at one end of the upper surface of the mechanism frame 7, and 31 is provided at the other end of the upper surface of the mechanism frame 7. Notches, 32 are hooking elastic claws provided on the lower surface of the mounting base 23 so as to project downward, and 33, 34 are hooking claws provided on both ends of the upper surface of the mounting base 23 so as to project laterally.

Now, as shown in FIG.
6 is attached to the mounting base 23 with the mounting screw 27,
When the mounting base 23 is lowered onto the side surface of the mechanism frame 7 from above, the hooking claw 33 is engaged with the groove 30 and the hooking claw 34 is moved to the notch 31 while the hooking elastic claw 32 is engaged with the support arm 29 by the snap. Since it engages, the mounting base 2 is attached to the mechanism frame 7.
3 can be attached with one touch. At this time, since the mechanism frame 7 is fixed to the base 101, the cover 102 may be covered thereafter.

In the state of being attached as shown in FIG. 1, the mounting base 23 falls sideways from the mechanism frame 7 to the respective hooking claws 3.
3, 34 are prevented by engaging the groove 30 and the notch 31, and the lateral displacement of the mounting base 23 along the mechanism frame 7 is prevented by the hook claw 33 engaged with the groove 30.
Further, the pulling up of the mounting base 23 is prevented by the hooking elastic claws 32 engaging with the support arm 29, so that the mounting base 23 is firmly mounted to the mechanism frame 7 and the accuracy of the mounting position is improved.

Furthermore, since the mounting base 23 can be fixed to the mechanism frame 7 by removing the cover 102 and performing a one-touch operation, the attachment and detachment of the accessory device at the service center can be performed, and the delivery time can be shortened.

[0015]

As described above, according to the present invention, it is possible to improve the mounting workability of the microswitch as one-touch mounting and to improve the mounting accuracy of the microswitch.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is an exploded view of an essential part showing a mounting base removed.

FIG. 3 is a vertical sectional side view showing a conventional one.

FIG. 4 is an explanatory diagram of a main part when FIG. 3 is viewed from the left.

5 is a perspective view showing the vicinity of a micro switch when FIG. 4 is viewed from the left. FIG.

[Explanation of symbols]

 7 Mechanism frame 23 Mounting base 26 Micro switch 29 Support arm 30 Groove 31 Notch 32 Hooking elastic claw 33 Hooking claw 34 Hooking claw

Claims (1)

(57) [Scope of utility model registration request] 1. A mechanism frame for holding an opening / closing mechanism and the like, and a mounting base mounted on a side surface of the mechanism frame,
In a circuit breaker having a micro switch as an auxiliary device attached to this mounting base, the mounting base has upwardly locking retaining elastic claws protruding downward on its lower surface and laterally above it. A supporting arm provided with two projecting fall-prevention and lateral-prevention retaining hooks, and the mechanism frame has a support arm projecting laterally downward and engaged with the hook elastic claw, and an upper surface thereof. A circuit breaker having a groove and a notch that are formed on the hook and engage with the hooking claws, respectively.