JPH07114099B2 - Circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circuit breaker and a circuit breaker, and more particularly to a stopper for a handle arm.

[Conventional technology]

As conventional circuits and circuit breakers of this type, those shown in FIGS. 4 and 5 have been proposed. In the figure, (1) is a housing consisting of a base (1a) and a cover (1b), and (2) is fixed to the back wall of the housing (1), that is, the inner bottom surface of the base (1a) by screws (3). The frame has parallel side plates. (4) is an operation handle fitted in the cover (1b) so as to protrude from the front wall of the housing (1), that is, the upper surface of the cover (1b), and (5) is the operation handle (4)
The frame (2) is capable of reciprocating in a fan shape with a protrusion (6) located in front of, ie, above, the position fixed by the screws (3) of the frame (2) as a fulcrum.
The handle arm supported by the (7) is the frame (2)
The lever pin that is inserted into the blade acts as a stopper that positions the handle arm (5) in the ON direction.
(8) is a lever pivotally attached to the frame (2) by a lever pin (7), (9) is a mover having a movable contact (9a), (10) is a mover (9) and lever ( 8) is a link mechanism that keeps on and off, and an open / close mechanism is configured by keeping on and off with other parts. Reference numeral (11) is a tension spring hung between the link mechanism (10) and the operation handle (4).
Is urged in the extending direction and the operating handle (4) and the handle arm (5) are urged in the direction of the protrusion (6). (12) is a stator having a fixed contact (12a), (13)
Is a trip bar that is rotatably supported by the frame (2), and (14) is a latch that is rotatably supported by the frame (2), and is a spring (not shown) at a reset position that can engage with the trip bar (13). )). A latch (15) is rotatably supported by the frame (2) and engages with the latch (14) in a disengageable manner, and the lever (8) is engaged in the disengageable manner. (16) is an arm formed integrally with the frame (2) and determines the reset position of the trip bar (13). (17) is a combined spring attached to the frame (2),
The trip bar (13) is biased toward the arm (16) and the latch (15) is biased toward the latch (14). (18) is an electromagnet of an electromagnetic tripping mechanism, and its plunger (not shown) is engaged with the trip bar (13). (19) is a bimetal of a thermal tripping mechanism, and its adjusting screw (19a) abuts on the trip bar (13).

Next, the operation will be described. When the operation handle (4) is tilted to the left in the figure in the state of FIG. 4, the link spring (11) bends the link mechanism (10) in two and the mover (9) is separated. Then, the operation handle (4) is moved to the fourth position.
When the handle arm (5) is stopped by the lever pin (7), the pulling spring (11) extends the link mechanism (10) as shown in the drawing to close the mover (9). Now, when an overcurrent flows in the ON state shown in FIG. 4, the bimetal (19) is heated and bent, and is pressed by the adjusting screw (19a), and the trip bar (13) rotates against the combined spring (17). Alternatively, or when a large current flows in the ON state shown in FIG. 4, the plunger of the electromagnet (18) is attracted and urged to rotate the trip bar (13) against the combined spring (17). 1
The clockwise rotation of 3) causes the latch (14) to rotate counterclockwise against the spring, and the latch (15) disengages from the latch (14) and rotates counterclockwise by the combined spring (17). When the lever (8) is moved, the lever (8) is disengaged from the latch (15), and the upper end of the link mechanism (10) is positioned to the right of the tension spring (11). The movable element (9) is bent in two by 11) and the movable element (9) is separated. In the above configuration, the lever (8), trip bar (13), latch (14), and latch (1) serve as the trip motion transmission mechanism.
5), arm (16), etc. are shown, but depending on the model, for example, trip bar (13) and arm (1)
There is a trip action transmission mechanism that does not have 6) and the latch (14) is operated directly by the trip mechanism.

[Problems to be solved by the invention]

In the conventional circuit and breaker as described above, the contact surface (5a) of the handle arm (5) that contacts the lever pin (7).
Is a vertical surface at the contact position, so that when the contact surface (5a) of the handle arm (5) collides with the lever pin (4) when the operation handle (4) is turned on, this collision force is indicated by the arrow (20). As shown, since the lever pin (7) is pressed in a substantially horizontal direction, the frame (2) receives a rotational force in the direction of the arrow (21) about the fixing position (A) of the screw (3). Due to the shocking rotation of the frame (2), for example, the arm (16) pushes the trip bar (13) to cause a relative displacement between the parts of the trip motion transmission mechanism, which causes a problem of mis-strip. It was

The present invention has been made to solve the problems to be solved by reducing the rotational force applied to the frame via the stopper when the operation handle is turned on, and thereby the relative displacement between the parts of the trip motion transmitting mechanism is caused. It is an object to obtain a highly reliable circuit and breaker capable of preventing mistrip.

In addition to the above-mentioned object, another invention of the present invention is a circuit which can effectively prevent the rotation of the frame by reducing the frictional force at the time of a collision generated between the contact surface of the handle arm and the roller which is the stopper. The purpose is to get a break.

[Means for solving problems]

In the circuit breaker and the circuit breaker according to the present invention, the angle formed by the contact surface between the stopper and the handle arm is greater than 0 ° and less than 90 ° with respect to the straight line passing through the contact point and the handle arm fulcrum, And it goes in the direction opposite to the fulcrum of the handle arm.

Further, a circuit breaker and a circuit breaker according to another invention of the present invention are the above-mentioned ones which are rollers capable of rotating by contacting the stopper with the contact surface.

[Action]

In the present invention, the impact force when the handle arm collides with the stopper is dispersed and absorbed by the lifting of the handle arm, so that the rotational force applied to the frame is reduced.

Further, according to another aspect of the present invention, the frictional force generated between the handle arm and the roller, which is a stopper, when they collide with each other is absorbed by the rotation of the roller, so that the rotational force applied to the frame is reduced.

Example of Invention

1 and 2 show an embodiment of the present invention. FIG. 1 is a side view of a main portion, and FIG. 2 is a partially enlarged view of FIG. In the figure, (22) is an abutment surface formed on the handle arm (5) and abutting against the lever pin (7) from the front wall of the housing (1), that is, the cover (1b) side,
It is formed so as to be substantially parallel to the back wall of the housing (1), that is, the inner bottom surface of the base (1a) when in the abutting position. The other structure is the same as that of the above-mentioned conventional device, and therefore its explanation is omitted.

If the contact surface (22) of the handle arm (5) is formed substantially horizontally in this way, the contact surface (22) of the handle arm (5) will be located on the lever pin (7) when the operation handle (4) is turned on. ) Impacts the lever pin (7) diagonally downward as indicated by the arrow (23), and the impact force causes the handle arm (5) to rise as indicated by the arrow (24). Therefore, the pressing force of the arrow (25) that is dispersed and absorbed and acts as the rotational force (21) of the frame (2) is reduced.

In the above-mentioned embodiment, the contact surface (22) of the handle arm (5) is shown to be substantially horizontal, but this contact surface (22) has a contact arm (5) when it is in the contact position. ) Through the fulcrum (B) of the handle pin (7) and on the straight line (26) in contact with the outer periphery of the upper side of the lever pin (7), turn toward the front wall with the center of the stopper as the fulcrum, and turn the fulcrum (B) of the handle arm (5) It may be formed within a range up to a straight line (28) connecting the center (C) of (7) and a straight line (28) orthogonal to the straight line (27). That is, the angle formed by the contact surface between the lever pin (7) which is a stopper and the handle arm (5) is greater than 0 ° and less than 90 ° with respect to the straight line passing through the contact point and the handle arm fulcrum (B). It is in the opposite direction to the handle arm fulcrum (B). The fulcrum (B) has a fixed position (A) and a lever pin (7).
It is assumed that it is located on the off side of the straight line (29) connecting the center (C) of the above and on the fixed position (A) side of the lever pin (7).

In FIG. 2, when the contact surface (22) has a larger inclination than the straight line (26) (a straight line that is lower left than the straight line (26)), that is, the contact surface (22) is outside the set range. When formed (including the vertical surface of the conventional device shown in FIG. 5), when the handle arm (5) collides with the lever bin (7), the handle arm (5) supports the lever pin (7) as a fulcrum (B). It receives the force to shift in the direction. Since the handle arm (5) is actually supported by the protrusion (6) and does not shift in the fulcrum (B) direction, most of the impact force of the handle arm (5) is applied to the lever pin (7) and the lever pin (7). ) In the direction of the arrow (25). On the other hand, in FIG. 2, when the contact surface (22) has a smaller inclination than the straight line (26) (a straight line which goes to the left above the straight line (26)), that is, the contact surface falls within the set range. When (22) is formed, when the handle arm (5) collides with the lever pin (7), the handle arm (5) tends to shift in the direction opposite to the fulcrum (B) with respect to the lever pin (7). Receive power. Therefore, the impact force of the handle arm (5) is dispersed and absorbed with respect to the lifting of the handle arm (5), and the force for pressing the lever pin (7) in the direction of the arrow (25) is reduced.

In addition, when the contact surface (22) is formed on the straight line (28) in FIG. 2, the contact surface (22) does not contact the lever pin (7), and therefore the straight line (contacting the lever pin (7) ( 28) before the straight line (a straight line that is tilted counterclockwise from the straight line (28) in FIG. 2).

FIG. 3 is a side view of a main portion showing another embodiment of the present invention. Reference numeral (22A) is an abutment surface formed on the handle arm (5), which is formed on a straight line (30) orthogonal to the straight line (29) at the abutting position. A roller (31) is rotatably attached to the lever pin (7) and acts as a stopper. The other structure is the same as that of the above-mentioned conventional device, and therefore its explanation is omitted.

If the roller (31) is provided as a stopper in this way, the contact surface (22A) of the handle arm (5) will be
The frictional force generated between the two when colliding with 1) is absorbed by the rotation of the roller (31), so that the frame (2)
The rotational force (21) applied to is reduced. In particular, as shown in FIG. 3, the contact surface (22A) is a straight line (3
When it is formed on 0), the impact force applied to the roller (31) acts near the straight line (26) as shown by the arrow (32), so this impact force is almost lifted up of the handle arm (5). Is absorbed by the handle arm (5), and no rotational force (21) is generated in the handle arm (5).

Although the lever pin (7) is used as the stopper in the above embodiments, it may be a pin protruding from the frame (2) or the handle arm (in the above embodiments). 5) contact surface (2
Although 2) and (22A) are shown as being flat (straight line), they may be circular (concave).

〔The invention's effect〕

As described above, according to the present invention, by setting the angle formed by the contact surface between the stopper and the handle arm to a predetermined value, it is possible to reduce the rotational force applied to the frame via the stopper when the operating handle is turned on. Therefore, there is an effect that it is possible to prevent a mistrip due to a relative deviation between the components of the trip motion transmitting mechanism.

Further, according to another invention of the present invention, since the roller is used as the stopper, the frictional force at the time of a collision generated between the contact surface of the handle arm and the roller is reduced, and the rotation of the frame can be effectively prevented. There is.

[Brief description of drawings]

FIG. 1 is a side view of a main part showing an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a side view of a main part showing another embodiment of the present invention. FIG. 4 is a side view showing the conventional device, and FIG. 5 is a side view of the main part of FIG. In the figure, (1) is a housing, (2) is a frame, and (3)
Is a fastening member, (4) is an operation handle, (5) is a handle arm, (7) is a stopper, (8) is a lever, and (9) is
Is a mover, (14) is a latch, (15) is a latch, (22),
(22A) is a contact surface, (26) is a straight line that passes through the fulcrum (B) of the handle arm and contacts the outer circumference of the stopper on the front wall of the housing, and (27) is the fulcrum of the handle arm (B) and the center of the stopper ( (28) is a straight line orthogonal to the straight line (27), (29) is a straight line connecting the fixed position (A) of the frame and the center (C) of the stopper, and (30) is a straight line (29). )
A straight line orthogonal to and (31) is a roller. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (6)

[Claims] 1. A frame fixed to an inner surface of a back wall of a housing by a fastening member and installed in the housing, an operation handle protruding outward from a front wall of the housing, and movable by being operated by the operation handle. An opening / closing mechanism for opening and closing the child, a tripping operation transmitting mechanism that is supported by the frame and transmits a tripping operation from the tripping mechanism to the opening and closing mechanism to open the opening and closing mechanism, and an integral or separate operation handle. A handle arm provided on the body and supported by the frame so as to reciprocate in a fan shape with one point of the frame as a fulcrum;
A stopper provided on the frame for contacting the handle arm and setting the ON position when the handle arm tilts in the ON direction, and a fulcrum of the handle arm is a fixed position of the frame by the fastening member. A circuit which is located on the off side of a straight line connecting the center of the stopper and the center of the stopper and on the rear wall side of the stopper, and in which the handle arm is pivotally supported by a supporting means which allows the handle arm to float in the direction of the stopper. In the shisher breaker, the angle formed by the contact surface between the stopper and the handle arm is greater than 0 ° and less than 90 ° with respect to a straight line passing through the contact point and the handle arm fulcrum, and the handle arm fulcrum Circuits and disconnectors characterized by being directed in the opposite direction. 2. The contact surface of the handle arm when in the contact position is substantially parallel to the inner surface of the back wall of the housing which is the fixed surface of the frame. Circuit and disconnection. 3. A lever, which is one component of a tripping motion transmission mechanism, rotatably attached to a frame by a lever pin, wherein the lever pin is a stopper. The circuit and disconnector described in paragraph 2. 4. A frame fixed to the inner surface of the back wall of the housing by a fastening member and installed in the housing, an operation handle protruding outward from the front wall of the housing, and movable by being operated by the operation handle. An opening / closing mechanism that opens and closes the child, a tripping operation transmission mechanism that is supported by the frame and that transmits the tripping operation from the tripping mechanism to the opening and closing mechanism to release the opening and closing mechanism, and an integral or separate operation handle. A handle arm provided on the body and supported by the frame so as to reciprocate in a fan shape with one point of the frame as a fulcrum;
A stopper provided on the frame for contacting the handle arm and setting the ON position when the handle arm tilts in the ON direction, and a fulcrum of the handle arm is a fixed position of the frame by the fastening member. A circuit which is located on the off side of the straight line connecting the center of the stopper and the center of the stopper and on the rear wall side of the stopper, and in which the handle arm is pivotally supported by a support means which allows the handle arm to float in the direction of the stopper. In the shisher breaker, the angle formed by the contact surface between the stopper and the handle arm is greater than 0 ° and less than 90 ° with respect to a straight line passing through the contact point and the handle arm fulcrum, and the handle arm is A roller that is directed in the direction opposite to the fulcrum and is a roller that can rotate using the stopper as the contact surface. Shiyadan device. 5. The contact surface of the handle arm at the contact position is formed on a straight line which is orthogonal to the straight line connecting the fixed position of the frame and the center of the stopper. The circuit and disconnector described in item 4. 6. A lever, which is a part of a tripping motion transmission mechanism, is rotatably attached to a frame by a lever pin, and a roller is attached to the lever pin. The circuit breaker or disconnector according to item 5 or 5.