JPS5819797Y2 - circuit break - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a circuit breaker, and more particularly to a circuit breaker in which a tripping rod that engages with an opening/closing mechanism is improved.

In conventional circuit breakers, the tripping rod that engages with the opening/closing mechanism is made of synthetic resin, so there is a risk that the engaging portion may wear out and cause mistrips.

Further, the spring acting on the tripping rod is a torsion spring wound several times in a coil shape, and it is very difficult to assemble it into the tripping rod.

Furthermore, in order to rotatably support the removal rod, the support shaft must be inserted through the shaft hole of the removal rod, which increases the number of parts and makes assembly difficult.

This invention was made in view of these conventional drawbacks.

This invention will be explained below with reference to the drawings.

FIG. 1 is a side sectional view showing one embodiment of a circuit breaker according to this invention.

FIG. 2 is an exploded perspective view of the components shown in FIG. 1.

FIG. 3 is a detailed view of a portion of FIG. 1.

FIG. 4 is an explanatory diagram of the operation of this invention.

Corresponding parts in the figure are designated by corresponding reference numerals.

1 to 4, a frame 2, the details of which are shown in FIGS. 2 and 3, is attached to a base 1 made of synthetic resin by means of hinges 3. As shown in FIGS.

- The handle 4 is rotatably supported by a shaft 5 inserted into a shaft hole 2-5 of the frame 2 shown in FIGS. 2 and 3.

One end of the U-shaped pin 6 is rotatably inserted into a hole 4-6 provided at the tip of the handle 4, and the other end is slidably supported in a long hole 2-6 of the frame 2. .

The lever 7 is rotatably supported by the other end of the U-shaped pin 6 at a pin support portion 7a in the center thereof.

The lower end of the presser plate 8 is fitted into the groove 1-8 of the base 1 and is constantly pressed upward by the spring 9, and the upper end of the presser plate 8 is engaged with one end of the lever 7.

The trip rod 10 is made of synthetic resin and is shown in FIGS. 2 and 3.
As shown in the figure, an integrally formed support shaft 10-2 is inserted into a groove 2-10 of the frame 2 and rotatably supported, and an engaging portion 10-7 that engages with the other end of the lever 7 have.

As shown in FIGS. 2 and 3, the L-shaped leaf spring 11 is
A horizontal portion 11-7, which is one side of the letter, abuts on an engaging portion 10-7 inserted through an abutment hole 10a provided in the horizontal direction of the removal bar 10.

In addition, the other side of the L-shape, the vertical part 11-1, is the removal rod 1.
It is inserted through the mounting hole 10b provided in the vertical direction at 0, and its end is fitted into the locking hole 1-11 of the base 1 shown in FIG. 3 and locked in the housing.

The protrusions 11a and 11b of the L-shaped leaf spring 11 are bent as shown in FIG.
The vertical part 11 of the L-shaped leaf spring 11 is engaged with the outer end surface of the L-shaped leaf spring 11 in the assembled state.
-1 is installed so that it curves to the right.

Due to the elasticity of this L-shaped leaf spring 11, the tripping rod 10 is pressed in a counterclockwise direction, that is, in a direction opposite to the direction in which the tripping rod 10 is removed, using the support shaft 10-2 as a fulcrum.

The center part of the mover 12 is fitted into the cut groove 8-12 of the holding plate 8, and one end thereof is attached to the mover attachment part 2-12 of the frame 2 as shown in FIG. A movable contactor 13 is attached.

The lower end of the bimetal 14, which is a thermal element, is integrally attached to the movable element 12 at the movable element mounting portion 2-12 of the frame 2, as shown in FIG.

The other end of the bimetal 14 is connected to the first end due to the heat generation effect caused by the current.
It bends to the right in the direction of the arrow shown in the figure, engages with the tip 10-14 of the tripping rod 10, and rotates the tripping rod 10 clockwise against the force of the L-shaped leaf spring 11.

The terminal device 15 is attached to the base 1 to connect an external conductor (not shown), and is connected to the bimetal 14 by an annealed copper stranded wire 16.

The terminal plate 17 is fixed to the base 1, has a fixed contact 18 opposite to the movable contact 13 attached to one end, and has an external conductor (
(not shown).

The terminal device 19 is attached to the base 1.

A cover 20 made of synthetic resin covers the components of the circuit breaker and is attached to the base 1.

Next, this operation will be explained using FIG. 1 and FIG. 4.

FIG. 1 shows the closed state of the circuit breaker, and the current flows from the terminal device 19 to the terminal plate 17 to the fixed contact 18 to the movable contact 13.
The current flows as follows: → mover 12 → bimetal 14 → annealed copper stranded wire 16 → terminal device 15, and the metal 14 curves to the right in the direction of the arrow shown in FIG. 1 due to the heating action of the current.

When an overcurrent exceeding a predetermined value flows, the tip of the bimetal 14 engages with the tip 10-14 of the tripping rod 10, causing the tripping rod 10 to rotate clockwise.

When the tripping rod 10 rotates clockwise, the tripping rod 1
The engagement between the retaining portion 10-7 of 0 and the other end of the lever 7 is released,
The lever 7 rotates clockwise about a pin support 7a supported on the other end of the U-shaped pin 6 as a fulcrum by the action of a spring 90 via a presser plate 8.

Therefore, the holding plate 8 moves upward, and the movable element 12 inserted into the cut groove 8-12 of the holding plate 8 also rises, and the movable contact 1
3 is separated from the fixed contact 18.

As described above, when an overcurrent flows, the circuit breaker is automatically opened from the closed circuit state shown in FIG.

To reclose the circuit breaker after a residual open circuit:
- Rotate the handle 4 clockwise around the shaft 5.

Then, the other end of the U-shaped pin 6 is inserted into the elongated hole 2-6 of the frame 2.
is pulled upward along the lever T.
The other end extends upward beyond the engagement portion 10-7 of the removal rod 10.

Therefore, when the current is interrupted and the bimetal 14 returns to its original position (as shown in FIG. 1) as described above, the tripping rod 10 is rotated counterclockwise by the action of the L-shaped leaf spring 110 and The state shown in the figure will be reached.

From this state...if the handle 4 is rotated counterclockwise, the other end of the U-shaped pin 6 will move downward along the elongated hole 2-6 of the frame 2, and the other end of the lever 7 and the pull-out rod will move downward. 10 engaging portions 10-7 engage with each other.

The lever T uses this engagement point as a fulcrum to push down the presser plate 8 against the force of the spring 9, returning to the state shown in FIG. 1 and re-closing the circuit.

As described above, according to this invention, after attaching the L-shaped leaf spring to the tripping rod, assembly is made extremely simple by inserting and assembling the support shaft of the tripping rod into the U-shaped groove of the frame from one direction. .

Furthermore, by bringing the horizontal portion of the L-shaped leaf spring into contact with the engaging portion of the tripping rod, wear of the tripping rod can be prevented and stripping can also be prevented.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing one embodiment of a circuit breaker according to this invention. FIG. 2 is an exploded perspective view of the components shown in FIG. 1. FIG. 3 is a detailed view of a portion of FIG. 1. FIG. 4 is an explanatory diagram of the operation of this invention. In the figures, corresponding parts in each figure are given corresponding symbols, and 1 is a base, 7 is a lever, 7a is a pin support, 8 is a holding plate, 8-12 is a cut groove, and 9 is a Spring, 10 is a pull bar, 107 is an engaging part, 10a is a contact hole, 10b is a mounting hole, 11 is an L-shaped leaf spring, 11a, 11
b is a projection, 12 is a movable element, 18 is a movable contact, 14 is a bimetal, and 18 is a fixed contact.

Claims (1)

[Claims for Utility Model Registration] 1. A fixed contact fixed to a base, a movable element having a movable contact facing the fixed contact at one end and fixed at the other end, and an intermediate part of the movable element. a holding plate having a groove into which the holding plate is fitted; a spring installed between the end surface of the holding plate on the base side and the base and acting in a direction to separate the movable contact from the fixed contact; a lever whose one end is locked to an end surface opposite to the base to maintain the closed state of the movable contact and the fixed contact, and whose intermediate portion is rotatably supported; the other end of the lever; a locking part for locking the base side end part in the middle part, the base side end part being rotatably supported, and extending from the middle part to the end face of the base side end part. one side of the L-shape is engaged with the engagement portion, the other side of the L-shape is inserted through the attachment hole, and the other end of the L-shape is inserted into the attachment hole; an L-shaped spring that presses the removal bar in a direction that locks the locking portion to the base and locks the locking portion to the other end of the lever; and an L-shaped spring that is connected in series to the fixed contact and the movable contact and that When an overcurrent exceeding the value flows, the lever bends and engages the other end of the tripping rod on the opposite side to the base, and moves in the direction of releasing the locking portion between the locking portion and the other end of the member. A circuit breaker with a bimetal that rotates the trip rod. 2 The other side of the L-shape of the L-shaped spring is provided with a protrusion that engages with the removal bar and a protrusion that engages with the base, and the detachment bar of both of the protrusions and the base engage with each other. 2. The circuit breaker according to claim 1, wherein the L-shaped spring is retained by adjusting the spring. 3. Utility model registration claims 1 or 2, in which a support shaft for rotatably supporting the tripping rod on a fixed portion is integrally formed at the end of the tripping rod on the base side. The circuit breaker listed.