JPS5936820Y2 - Trip mechanism for overcurrent circuit breaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a hooking piece in a trip mechanism for an overcurrent circuit breaker.

Conventionally, as shown in FIGS. 1 and 2, a hooking piece 3 of a trip mechanism 2 in an overcurrent circuit breaker 1 is attached to a frame 6 for mounting a handle 4 and a contact opening/closing mechanism 5 through a pin 7. Both ends of the coil spring 8 are engaged between the frame 6 and the hooking piece 3 to bias the hooking piece 3 in the anti-trip direction (in the direction of arrow A in FIGS. 1 and 2). There is.

Therefore, when attaching the hooking piece 3 to the frame 6 by applying a rotational force, the pin 7 and the spring 802 parts are required, and the hooking piece 3 is attached to the pin 7 mounting hole by a slide pin during component molding. must be molded, and if there is any looseness at the attachment part of the hooking piece 3 to the pin 7,
Connecting piece 1 of contact opening/closing mechanism 5 to stepped part 9 of hooking piece 3
There was a drawback that the zero engagement became loose and the contact opening/closing operation became unstable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a trip mechanism for an overcurrent circuit breaker that has a simple structure and excellent performance, thereby eliminating the above-mentioned drawbacks of the prior art.

Next, the configuration of an embodiment of the present invention will be explained with reference to FIGS. 3 to 8.

Frame 11 and hooking piece 12 for mounting the handle and contact opening/closing mechanism, which are attached to the synthetic resin base of the overcurrent circuit breaker.
This means bending piano wire into an L-shape into the V-shaped grooves 13 and 14 shown in FIGS. The spring 15 is assembled through one side 15a of the spring 15 with the V-shaped grooves 13 and 14 facing each other as shown in FIG. Stopper 17 formed in 11 and engaging piece 1
2 in the vertical position (the state shown in Figure 3).

Next, after this assembly, the other side 15b of the spring 15 is resiliently engaged between the engaging protrusion 18 integrally formed with the frame 11 and the engaging protrusion 19 integrally formed with the engaging piece 12, and the engaging piece 12
While applying a rotational force in the direction of the arrow B in FIG.
1, and holds the engaging piece 12 in the vertical position shown in FIG.

In this manner, the left and right positions of the engaging pieces 12 relative to the frame 11 via the springs 15 are determined by the engagement of the springs 15b with the tapered portions 20.21 of the respective engaging protrusions 18.19. The piece 12 can swing smoothly without its left and right sides coming into contact with the inner side of the frame 11, and at the same time, the spring 15 is prevented from being pulled out, and in this state, the engaging piece 12 does not have any play in the hinge. The connecting piece 22 and the engaging piece 12 of the contact opening/closing mechanism can swing without
By stabilizing the engagement with the stepped part 23, the contact opening/closing operation in the overcurrent circuit breaker can be stabilized, and the mounting structure can be simplified by applying rotational force to the engaging piece 120 to the frame 11. The number of parts and assembly man-hours can be significantly reduced.

In this embodiment, the spring 15 is connected with a V-groove 13° 14 in order to eliminate play in the hinge of the hooking piece 12, but even if this hole is used as a regular hole, the production cost will be reduced due to the reduction in the number of parts and assembly man-hours. It is possible to obtain a reduction effect and a left-right positioning effect of the engaging piece 12.

Next, the effects of the present invention will be explained.

The present invention is to turn on and off the contacts in the load circuit by manual operation of the handle, and to cut off the filtration current by turning off the contacts through the contact opening/closing mechanism by swinging the latch piece due to the curvature of the bimetal that snaps during overload. In the device, the frame 11 for mounting the handle and the contact opening/closing mechanism and the hooking piece 12 are arranged so that the V-shaped grooves 13 and 14 formed on both left and right sides of the frame 11 and the lower end surface of the hooking piece 12 are butted against each other. While holding the side 15a of the spring 15 formed by bending piano wire into an L-shape, the hooking piece 12 can be pivoted.
The positioning protrusion 16 formed on the frame 11 is mounted so that the positioning protrusion 16 formed on the frame 11 can be held in a vertical position by contacting the stopper 17 formed on the frame 11, and the tapered portions of the engaging protrusions 18 and 19 formed on the frame 11 and the engaging piece 12, respectively. 20.21 is engaged with the other side 15b of the spring 15, and the engaging piece 12
This is a trip mechanism for an overcurrent circuit breaker which applies a biasing force in a direction to abut against the stopper 17.

As a result, the present invention can reduce the number of parts and assembly man-hours involved in attaching the locking piece by applying rotational force, thereby lowering the production cost of the current-carrying circuit breaker, as well as stabilizing the tripping operation. effective.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of a conventional embodiment, FIG. 2 is a detailed view of its main parts, FIG. 3 is a side view of an embodiment of the present invention, FIG. 4 is a side view of the frame 11, and FIG. Figure 5 is a plan view of Figure 4;
Fig. 6 is a side view of the hooking piece 12, and Fig. 7 is C of Fig. 6.
-C line sectional view, and FIG. 8 is an exploded assembly explanatory view of this embodiment in a state seen from arrow D in FIG. 3. 11... Frame, 12... Hanging piece,
13, 14...Groove, 15...Spring, 15a...One side of spring 15, 15b
...Other side of spring 15, 18.19...
...Engaging protrusion.

Claims (1)

[Scope of utility model registration request] The contact in the load circuit is turned on and off by manual operation of one hand, and the overcurrent circuit breaker is turned off via the contact opening/closing mechanism by the swinging of the latch piece due to the bending of the bimetal during overload. , the frame 11 for mounting the handle and the contact opening/closing mechanism, and the engaging piece 12,
The left and right side surfaces of the frame 11 and the V-shaped grooves 13 and 14 formed in the lower end tube of the hooking piece 12 are butted against each other, and one side 15a of the spring 15 formed by bending piano wire into an L-shape is held in between and hooked. The piece 12 is attached so as to be swingable and the positioning protrusion 16 formed on the hooking piece 12 can contact a stopper 17 formed on the frame 11 to maintain a vertical position, and is formed on each of the frame 11 and the hooking piece 12. An overcurrent characterized in that the other side 15b of the spring 15 is engaged with the tapered portions 20, 21 of the engagement protrusion 18, 19 to apply a biasing force to the engagement piece 12 in the direction of contacting the stopper 17. Trip mechanism for circuit breakers.