JP3425542B2 - Circuit breaker reset device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly, to a reset device therefor. 2. Description of the Related Art An example of a conventional circuit breaker is shown in FIGS. The main circuit conductive portion of the circuit breaker is mainly connected to a fixed contact 1 also serving as a power supply side terminal, a movable contact 2 operated by an opening / closing mechanism unit described later, and a movable contact 2 (not shown). Load-side terminals. The opening / closing mechanism is formed in an opposing surface of a base frame 3 formed by bending into a substantially U-shape, and a handle lever 5 on a shaft 4 provided rotatably is provided.
Trip lever 7 on shaft 6, contact holder 9 on shaft 8
Contains. Further, the trip lever 7 and the contact holder 9 are rotatably provided on the shaft 10 and the shaft 11, respectively. The upper link plate 13 and the lower link plate 14 are rotatably connected to each other by the connecting shaft 12. Are connected by a link mechanism 15. The movable contact 2 is rotatably provided on a shaft 11 provided on the contact holder 9. [0004] The operation of such a conventional circuit breaker will be described. In FIG. 7 showing the ON state, the rotation of the trip lever 7 urged in the counterclockwise direction by the operation spring 16 provided between the connecting shaft 12 and the handle lever 5 causes the end thereof to be pulled. It is prevented by engaging with the release mechanism 17. The handle lever 5 urged by the operation spring 16 does not rotate counterclockwise from the illustrated position because the handle lever 5 is engaged with the shaft 6. The operation spring 16 urges the connecting shaft 12 substantially to the left to extend the link mechanism 15, thereby rotating the contact holder 9 counterclockwise and bringing the movable contact 2 into contact with the fixed contact 1. . The connecting shaft 12
Is in contact with a part of the trip lever 7 and does not move leftward from the position shown. The movable contact 2 is urged in the counterclockwise direction by a contact pressure spring 18 provided between the movable contact 2 and the contact holder 9, and is required between the fixed contact 1 and the movable contact 2. High contact pressure. Next, the OFF operation will be described with reference to FIGS. 7 and 8. In FIG. 7, when the operation handle 19 attached to the handle lever 5 is operated to rotate the handle lever 5 clockwise, the operation direction of the operation spring 16 changes the line connecting the center of the connecting shaft 12 and the shaft 10 (hereinafter referred to as a line). , Crossover point), the handle lever 5 automatically rotates clockwise, the connecting shaft 12 moves rightward, and the link mechanism 15 bends as shown in FIG. The child holder 9 rotates clockwise, and the movable contact 2 is separated from the fixed contact 1. The ON operation is performed by rotating the handle lever 5 counterclockwise, contrary to the OFF operation, and when the connecting shaft 12 exceeds the crossover point to the left, the link mechanism 1 is turned on.
5 is extended, and the handle lever 5 is automatically rotated in the counterclockwise direction to reach the state shown in FIG. Next, the trip operation will be described with reference to FIGS. 7 and 9. In FIG. 7, a tripping mechanism 17 is a tripping mechanism disclosed in Japanese Patent Application Laid-Open No. 63-43236, and is not a main part of the present application. The latch 20 includes three pins 21, 22, 23 held by the latch 20, a latch plate 24 inserted from the upper side to the lower side of the frame 20, a return spring (not shown) of the latch plate 24, and a trip bar 25. When a trip device (not shown) operates, the trip mechanism 17 rotates the trip bar 25 counterclockwise, the latch plate 24 rotates counterclockwise about the insertion hole on the upper side of the frame 20, and the lower side rotates. The latch plate 24 engaged with the peripheral edge of the insertion hole moves downward, the pin 22 moves downward together with the latch plate 24, and the pin 23 occupies the space occupied by the pin 22.
Moves rightward and the engagement between the pin 23 and the trip lever 7 is released. As a result of the disengagement of the engagement, the trip lever 7 rotates counterclockwise, the shaft 10 and the connecting shaft 12 move, and the connecting shaft 12 relatively moves beyond the crossover point to the right and the link mechanism 15 is moved. The movable contact 2 is separated from the fixed contact 1 by bending and the contact holder 9 rotates clockwise, and the trip state shown in FIG. 9 is established. In this state, the contact holder 9 engages with the shaft 6 and does not rotate clockwise from the position shown in the figure, and the handle lever 5 stops at the position where the operation spring 16 is most contracted. Next, the reset operation will be described with reference to FIGS. 9, 10 and 8. In order to turn on the circuit breaker from the trip state, it is necessary to perform a reset operation from the trip state to the above-described OFF state. In FIG. 9, when a reset operation force is applied to the operation handle 19 to rotate the handle 5 clockwise, the reset lever 5a extended from the handle lever 5 pushes the reset lever 5a to rotate the trip lever 7 clockwise. 7 is in the state of FIG. 10 in which the tip of 7 has moved below the pin 23. When the operator releases the operating handle 19 in this state, the trip lever 7 automatically rotates counterclockwise, and the pin 2 of the release mechanism 17 is again rotated.
8 and the state shown in FIG. In general, the operating spring 16 is selected to have a considerably large acting force so as to satisfy a predetermined performance of the circuit breaker. A larger operation force is required for the reset operation that had to be extended. In a conventional circuit breaker, as shown in FIGS. 11 and 12, a handle lever 5 has a pair of opposing legs 5b fitted on the shaft 4 at the ends.
And an intermediate surface 5c connecting the opposing legs 5b, and a reset arm 5a extending from another side of the intermediate surface 5c. The reset arm 5a and the opposing leg 5b are in the same direction so as to be orthogonal to the intermediate surface 5c. It is formed by bending. Such a conventional handle lever 5 has a possibility that the reset arm 5a may buckle to the reaction force F of the operation spring 16 and be deformed as shown by a chain line in FIG. Since a sheet having a larger thickness and a sheet having a higher strength were selected, there were problems that the price was high and that there was a limitation in part processing. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a circuit breaker in which parts can be easily processed and which is inexpensive. [0012] In order to solve the above-mentioned problems, the invention according to claim 1 comprises a fixed contact, a movable contact that comes into contact with and separates from the fixed contact, and a rotatable contact. A trip lever provided, a link mechanism comprising a pair of link members provided between the movable contact and the trip lever, and a link shaft connecting the link members to each other; and two opposing legs having a U-shaped cross section A handle lever having a reset arm which is rotatably supported at the end of the arm and bent in a direction in which the legs extend from an intermediate surface connecting the legs, a spring provided between the handle lever and the connection shaft,
A reset device for re-locking a trip lever, which operates when the trip mechanism operates, via a reset arm, of a circuit breaker having a trip mechanism for locking the rotation of the trip lever by the biasing force of a spring. This is an engagement means for engaging the reset arm of the handle lever and both legs during the operation of stopping, and is further extended from both ends of the reset arm.
The arm side hook formed by bending in both leg directions and provided on both legs
Consisting of a leg-side projection or a leg-side hook that engages with the set arm-side hook
An engaging means is provided. With such a configuration, the reaction force of the spring when re-locking can be distributed to the base at which the reset piece extends and the engaging means between the reset piece and the two legs. In addition, such an action is achieved by an arm side hook formed by bending the engaging means from both ends of the reset arm further in both leg directions and a leg side projection or a leg side hook engaged with the arm side hook provided on both legs. Therefore, it can be realized with the minimum number of parts. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS . 1 to 4 and an embodiment shown in FIG. The description of the parts substantially the same as those in the related art is omitted, and the same reference numerals are used for the components. In the embodiment shown in FIGS. 1 to 4, a handle lever 30 is provided instead of the handle lever 5 of the prior art in FIG. 2 and 3, similarly to the handle lever 5, the handle lever 30 includes an intermediate surface 30c, a reset arm 30a bent from the intermediate surface 30c to be orthogonal to the intermediate surface 30c, and a pair of opposed legs 30b. The handle lever 30
Further comprises a hook 30d bent from both ends of the reset arm 30a in the direction of the opposing leg 30b.
A hook portion 30e is formed in Ob so as to be fitted to the hook portion 30d. With such a configuration, the reaction force F applied to the reset arm 30a in the reset operation is dispersed and acts on the bent portion of the reset arm 30a and the engagement portion between the hook portion 30d and the hook portion 30e. It is not necessary to select a material having a larger plate thickness or a stronger material for the lever 30. Also, handle lever 30
After press-punching the shape of the developed view as shown in FIG. 4, the portion of the hook portion 30 d is bent at a right angle along the chain line indicated by − and −, and then along the chain line of − and −. To bend the entire reset arm 30a, and then the opposite leg 30b along the-and-chain lines.
Is bent, the hook portion 30e is located at a portion where the hook portion 30e is engaged with the hook portion 30d. For this reason, the handle lever 30 can be constituted by a single component, and the processing is simple. In another embodiment shown in FIG. 6, the handle lever 32 is formed by bending a hook portion 32b from both ends of a reset arm 32a in the same manner as in the above-described embodiment.
An engagement protrusion 32d that engages with the hook portion 32b is formed to be bent at c. Note that the handle lever 31 of the reference example shown in FIG. 5 has a hook 3 extending from opposite ends 31c with engagement projections 31b projecting from both ends of a reset arm 31a.
1d engages with the engagement projection 31b. The embodiment of the present invention has been described above. However, the embodiment of the present invention disclosed above has the following features.
This is merely an example, and the scope of the present invention is not limited to the above embodiment of the present invention. The scope of the present invention is defined by the appended claims, and is intended to include all modifications within the scope and meaning equivalent to the appended claims. The present invention is embodied in the above-described embodiment, and has an effect that the reset operation can be reliably performed by a simple and inexpensive reset device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a main part of a circuit breaker in an ON state incorporating a first embodiment of a reset device according to the present invention. FIG. 2 is a side view showing the reset device of FIG. 1 taken out; FIG. 3 is a view of the reset device of FIG. 2 as viewed from the left. FIG. 4 is a development view of the reset device of FIG. 1; FIG. 5 is a diagram corresponding to FIG. 2 of a reference example of a reset device for a circuit breaker . FIG. 6 shows another embodiment of the reset device according to the present invention.
FIG. FIG. 7 is a side view of a main part of a circuit breaker in an ON state incorporating a conventional reset device. FIG. 8 is a diagram corresponding to FIG. 7 in an OFF state. FIG. 9 is a diagram corresponding to FIG. 7 in a trip state. FIG. 10 is a diagram corresponding to FIG. 7 during a reset operation. FIG. 11 is a side view showing the reset device of FIG. 7 taken out; 12 is a view of the reset device of FIG. 11 as viewed from the left. [Description of Signs] 1 fixed contact, 2 movable contact, 3 base frame, 7 trip lever, 9 contact holder, 12 connecting shaft, 13 upper link plate, 14 lower link plate, 1
5 links, 16 operating springs, 17 release mechanism, 19
Operation handle, 30 Handle lever (30a Reset arm, 30b Opposed leg, 30c Intermediate plane, 30d, 30
e Hook part 31 Handle lever (31a Reset arm,
31b engaging projection, 31c opposing leg, 31d hook) 32
Handle lever (32a reset arm, 32b hook,
32c opposing leg, 32d engaging projection)

Claims (1)

(57) [Claim 1] A fixed contact, a movable contact which comes into contact with and separates from the fixed contact, a trip lever rotatably provided, the movable contact and the trip. A link mechanism comprising a pair of link members provided between the lever and a connecting shaft for connecting the link members to each other, and a rotatable support at the ends of the opposed legs having a U-shaped cross section. A handle lever having a reset arm formed by bending the legs in a direction in which the legs extend from an intermediate surface connecting the legs, a spring provided between the handle lever and the connection shaft, and the trip caused by a biasing force of the spring. A circuit breaker provided with a trip mechanism for locking the rotation of the lever, wherein the trip lever, which rotates when the trip mechanism is operated, is reset via the reset arm. In the reset device to locked, met engagement means as said reset arm of the handle lever during re-locked to the operation and said legs are engaged
From both ends of the reset arm in the direction of both legs.
And the arm side hook formed by bending
The engagement comprising a leg-side projection or a leg-side hook engaged with the arm-side hook;
The reset device of the circuit breaker, characterized in that a coupling means.