JPH0733348Y2 - Circuit breaker operating mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an operating mechanism of a circuit breaker having a toggle link mechanism.

[Conventional technology]

An operation mechanism of a circuit breaker having a toggle link mechanism is conventionally configured as shown in FIG. 3, for example. Where 1
Is a latch, which is axially supported by a pin 4 on a support frame 3 attached to the case 2, and the latch 1 is locked by a latch receiver 5 of a trip portion. Latch 1 is pivot pin 1a
And a pivot portion provided at one end of the first toggle link 6
6a is pivoted. The second toggle link 7 is connected to the other end of the first toggle link 6 by a toggle pin 8, and the other end of the second toggle link 7 is connected to the middle of the movable contact 9 in the length direction (though not shown). ). One end of the movable contactor 9 is attached to the rotary shaft 10, and the other end thereof is swung by the operation of the toggle links 6 and 7, and the fixed contactor 11 also serves as a power supply terminal.
It is configured to come into contact with and separate from. The handle 12 protruding to the outside of the case 2 is pivoted so as to pivot left and right around a pivot leg (not shown) attached to the case 2 as a fulcrum, and pivot the operating lever 13 left and right. The operating lever 13 has a hook 15 for hooking a hook provided at the end of the opening / closing spring 14.
The opening / closing spring 14 is stretched between the hooking portion 15 and the toggle pin 8 to form an operating mechanism. Reference numeral 16 is a lead wire, 17 is a trip coil, 18 is a contact terminal to an external circuit, and 19 is a movable iron piece attracted to the trip coil 17.

In the closed state of the circuit breaker shown in FIG. 3, the center line of the opening / closing spring 14 is located on the left side of the pin 1a, and the toggle links 6 and 7 pull the toggle pin 8 to the component of the tension of the opening / closing spring 14 to the left. Thus, the movable contactor 9 is pressed against the fixed contactor 11 and kept in a substantially linear shape to close the circuit.

The current of the circuit breaker flows in the direction of the fixed contact 11-movable contact 9-lead wire 16-coil 17-terminal 18, and when this current exceeds a predetermined value, the coil 17 attracts the movable iron piece 19, so the latch receiving 5 is disengaged from the latch 1, the latch 1 is rotated counterclockwise, and the pivot pin 1a is moved to the left side of the center line of the opening / closing spring 14, so that the toggle links 6 and 7 are connected to each other. By the component force in the direction of the arrow Q due to the tension, the movable contact 9 is bent in an inverted V shape and pulled up to be separated from the fixed contact 11.

Further, in the closed state shown in FIG. 3, the handle 12 is in the left direction, but when the handle 12 is manually rotated in the right direction, the center line of the opening / closing spring 14 shifts to the right side of the pivot pin 1a,
Even if the latch 1 is not tripped, the tension of the opening / closing spring 14 gives a toggle link to the toggle pin 8 by the component force in the direction of the arrow Q.
6 and 7 are bent in an inverted V shape and the movable contact 9 is fixed to the fixed contact 11
Pull away from. When the handle 12 is rotated to the left, the movable contact 9 is pressed against the fixed contact 11 again.

[Problems to be solved by the device]

As shown in FIG. 4 and FIG. 5, the tensioning structure of the opening / closing spring 14 of the conventional circuit breaker is enlarged and two notches 13a-13a are provided in the width direction of the operating lever 13, and these notches 13a-13a are provided. Two upper and lower hooks 14a, 14b provided on both ends of the opening / closing spring 14 between the notch remaining portion 13b between the notches 13a-13a and the toggle pin 8.
Is locked. When the upper hook 14a is hooked on the notch remaining portion 13b having a rectangular cross section, the hook 14a is supported by the two corners P, P of the notch remaining portion 13b. Also lower hook
14b is wound around the toggle pin 8.
Therefore, the positions of the upper and lower hooks 14a and 14b with respect to the notch remaining portion 13b and the toggle pin 8 are automatically restrained. Therefore, it is desirable that the respective surfaces including the upper and lower hooks 14a and 14b be in a right-angled relationship. If the angle is larger or smaller than this angle, the coil-shaped opening / closing spring 14 has a torque acting in the circumferential direction. As shown in the figure, the toggle pin 8 tries to rotate in the circumferential direction having its length as a diameter, and a large friction is generated between the first toggle link 6 and the second toggle link 7, and the operation mechanism cannot be operated. It has the drawback of falling into

An object of the present invention is to provide a circuit breaker operating mechanism that can be smoothly operated without the torque pin trying to rotate the toggle pin as a circumference in the length direction even if the hook surfaces at both ends of the opening / closing spring are not in a right angle relationship. To provide.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides an operation lever pivotally supported by a support frame, a first toggle link pivotally supported by a latch pivotally supported by the support frame, and a toggle pin for the first toggle link. A second toggle link connected thereto and an opening / closing spring stretched by hooking hooks at both ends between the operation lever and a toggle pin are provided, and the second toggle is rotated by turning the operation lever left and right. In an operating mechanism of a circuit breaker in which a movable contact connected to a link oscillates, two cutouts are provided in the width direction of the operation lever, and the remaining portion between the cutouts has a diameter smaller than that of the hook. A protrusion having a semicircular cross section is provided, and the hook of the opening / closing spring is hooked on the protrusion.

[Action]

Two notches are provided in the width direction of the operating lever, and a protrusion having a semicircular cross section with a diameter smaller than the diameter of the hook is provided at the remainder of the notch, and the semicircular upper hook of the opening / closing spring is hooked on this protrusion. Since it is stopped, the upper hook is supported at one point of this protrusion. Therefore, even if there is a deviation other than a right angle between the upper and lower hooks of the opening / closing spring, this deviation is adjusted by the allowance between the diameter of the upper hook and the width of the remaining cutout portion, and no torque is applied to the toggle pin.

〔Example〕

FIGS. 1 and 2 show an embodiment of an open / close spring tension structure in an operating mechanism of a circuit breaker according to the present invention, and FIGS. 3 to 6 are the same as FIGS. 3 to 6. The same reference numeral is attached. 1 and 2, the opening / closing spring 14 has upper and lower hooks 14a and 14b hooked on the operating lever 13 and the toggle pin 8 and stretched between them, as in the conventional one. Also, the operating lever 13 is 2 in the width direction.
The two notches 13a-13a are provided, but this notch remaining portion 13b is different from the conventional one in that a protrusion 20 having a semicircular cross section having a smaller diameter than the upper hook 14a is provided. The upper hook 14a of the opening / closing spring 14 is hooked on the protrusion 20. Therefore, since the upper hook 14a is supported by the protrusion 20 at one point, the upper hook 14a is rotatable within the range limited by the width of the notch remaining portion 13b, and the relationship between the upper hook 14a and the lower hook 14b of the opening / closing spring 14 is large. Is not restricted and no torque is applied to the toggle pin 8, so that the operation mechanism operates smoothly.

Since the operation of the operating mechanism of the circuit breaker according to the present invention is exactly the same as the conventional one, the description thereof will be omitted.

[Effect of device]

As described above, according to the present invention, the semi-circular hook at one end of the opening / closing spring is hooked on the protrusion having the semi-circular cross section provided on the remaining notch in the width direction provided on the operation lever. The hook is supported by a single point and can rotate freely within the limits determined by the width of the remaining cutout and the diameter of the hook, and the angle of each plane including the hooks at both ends of the open / close spring deviates from the specified right angle. However, the toggle pin does not generate torque along the circumference having the diameter of the length, and the operating mechanism can operate smoothly, thus providing a highly reliable circuit breaker.

[Brief description of drawings]

1 and 2 show an embodiment of a tensioning structure for an opening / closing spring in an operating mechanism of a circuit breaker, and FIG. 1 is a front view,
FIG. 2 is a plan view, FIG. 3 is a side sectional view showing an example of an operating mechanism of a circuit breaker, and FIGS. 4 to 6 are examples of a conventional open / close spring tension structure in an operating mechanism of a circuit breaker. FIG. 4 is a front view, FIG. 5 is a plan view, and FIG. 6 is a plan view when there is a twist between the hooks at both ends of the opening / closing spring. 1: Latch, 3: Support frame, 6: First toggle link, 7: Second toggle link, 8: Toggle pin, 13: Operation lever, 13a:
Notch, 13b: remaining notch, 14a, 14b: hooks at both ends of the opening and closing spring, 20: protrusion.

Claims (1)

[Scope of utility model registration request] 1. An operating lever pivotally supported by a support frame,
A first pivotally supported latch that is pivotally supported by the support frame
The operation includes a toggle link, a second toggle link connected to the first toggle link with a toggle pin, and an opening / closing spring stretched by hooking hooks at both ends between the operation lever and the toggle pin. In a circuit breaker operating mechanism in which a movable contact connected to the second toggle link swings by a swinging operation of a lever, two notches are provided in a width direction of the operating lever, and a gap between the notches is provided. An operating mechanism of a circuit breaker, characterized in that a protrusion having a semicircular cross section having a diameter smaller than that of the hook is provided on the remaining portion, and the hook of the opening / closing spring is hooked on the protrusion.