JP4545298B2 - Circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker, and more particularly to a circuit breaker having a contact welding position display function.
[0002]
[Prior art]
A conventional circuit breaker includes, for example, a case, a handle, a fixed contact fixed to the case and provided with a fixed contact, a movable contact provided with a movable contact arranged to face the fixed contact, and an electric circuit A tripping device that opens the movable contact from a fixed contact with an abnormal current such as an overcurrent or a short-circuit current, and a pressing member that is connected to the handle via a link and that has an engaging portion with the tripping device; It has a cross bar pressed by the pressing member and a movable contact which is pressed by the cross bar and behaves elastically, and opens and closes the movable contact and the fixed contact by operating an operation handle, and the tripping device operates. In this case, the contact is forcibly opened regardless of whether or not the contact closing operation is restricted by the operation handle.
[0003]
[Problems to be solved by the invention]
However, when the contact is forcibly opened by an abnormal current, a pressing member connected to the handle via a link and provided with an engagement portion with a tripping device, a cross bar pressed by the pressing member, and a cross Since the mechanism of the movable contact which is pressed by the bar and behaves elastically is configured to be completely separated, the engagement between the tripping device and the pressing member is released in an abnormal current, and the movable contact is welded to the fixed contact. Even in this case, the handle was structured to move to the off position. Therefore, even if the contact is welded, the handle is turned off, so that the user may misunderstand that the contact is in an open state when the handle is in the off position, leading to a reduction in safety. It was.
[0004]
Accordingly, an object of the present invention is to provide a circuit breaker that is improved in safety by preventing a user from being misidentified by displaying a welding state of a contact by a position of a handle. Further, in a thin two-pole circuit breaker having a configuration in which two movable contacts extend in a substantially opposite direction from the pivot center of the pivoting crossbar, the circuit breaker having the same effect Is to provide a vessel.
[0005]
Delete [0006]
[Means for solving problems]
In order to achieve the above-mentioned object, the first aspect of the present invention provides a handle that is rotatably disposed in the case, and is constantly biased in the direction of the off position by a spring, an engaging portion is provided at one end, and the other end is provided. Is provided with a pressing member provided with a link attaching portion that is connected to the handle via a link, and is rotatably provided so as to be detachable from an engaging portion of the pressing member, and is spring-biased in the direction of the pressing member. An operating plate, a fixed contact fixed to the case and provided with a fixed contact, a movable contact provided opposite to the fixed contact and provided with a movable contact, and a direction in which the movable contact is separated from the fixed contact at all times In a state where the engaging portion of the pressing member is engaged with the operating plate, the handle is rotated from the off position to the on position, and is pressed against the link provided on the handle with the engaging portion as a fulcrum. A holding member that rotates and Even in conjunction with the movement of the member, the movable contact is mounted and held, and the movable contact rotates so as to come in contact with and away from the fixed contact. In a two-pole circuit breaker configured to be substantially symmetric with respect to the center of rotation and including a rotating member interlocked with the operation of the movable contact, the movable contact and the fixed contact are in a welded state. When the engagement between the operating plate and the pressing member is released, the linkage member is arranged so that the handle stops at an intermediate position between the on position and the off position when the handle moves from the on position to the off position. The holding member is provided between the engaging portion of the pressing member and the link mounting portion and between the rotating member, and the pressing member is connected to the linkage by a link provided on the handle when the handle moves from the on position to the off position. Using the mounting part of the member as a fulcrum The rotation preventing portion for holding the engaging portion of the holding member so as to prevent the rotating operation performed but on the operating plate.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Will be described in detail an embodiment in the drawings in the following. FIG. 1 shows a structural diagram when the circuit breaker of one embodiment is on, and FIG. 2 shows a structural diagram when it is off. FIG. 3 shows a structural diagram in the case where the handle is positioned between on and off in a state where the contact is welded and the operating plate and the holding member are disengaged due to an abnormal current. It is.
[0008]
The circuit breaker in FIGS. 1 to 3 includes a handle 101, a pressing member 103, a link 102 connecting the handle 101 and the pressing member 103, a fixed contact 105, a fixed contact 107, a movable contact 109, The movable contact 111, the cross bar 113, the operation plate 104, and the linkage member 114 that links the pressing member 103 and the cross bar 113 are configured.
[0009]
The handle 101 is rotatably disposed in the case, is always biased in the direction of the off position by a spring, and is linked to the pressing member 103 by a link 102. The pressing member 103 is provided with an engaging portion 10302 for engaging with the operation plate 104 at one end, and provided with a linking member mounting portion 10303 for attaching the linking member 114 for linking the cross bar 113 and the pressing member 103 to the other end. A mounting portion 10301 for the link 102 that links with the handle 101 is provided between the engaging portion 10302 and the linking member mounting portion 10303.
[0010]
The movable contact 111 is always urged in the direction of separating from the fixed contact 107, and the cross bar 113 is urged in the same direction. In a state where the engaging portion 10302 of the pressing member 103 and the operation plate 104 are engaged, the pressing member 103 is moved via the link 102 by rotating the handle 101 from the on position in FIG. 1 to the off position in FIG. The engaging member 10302 is rotated in the clockwise direction in the drawing, the interlocking material 114 and the cross bar 113 are operated in conjunction with the operation of the pressing member 103, and the movable contact 109 is separated from the fixed contact 105. To do.
[0011]
The linking member 114 is a member provided to operate the pressing member 103 and the cross bar 113 in conjunction with each other. The linking member 114 links the operation of the pressing member 103 and the cross bar 113 when turned on and off, and presses when the contact is welded. It has a role of regulating the movement of the member 103.
[0012]
Next, the operation from the off time of FIG. 2 to the on time of FIG. 1 will be described. In FIG. 2, the operation plate 104 and the pressing member 103 are engaged. When the handle 101 is rotated from the OFF position in FIG. 2 to the ON position in FIG. 1, the attachment portion of the handle 101 and the link 102 is rotated along the rotation direction of the handle 101. Since the link 102 is linked to the pressing member 103, the pressing member 103 is pressed. However, since the pressing member 103 is engaged with the operating plate 104, the engaging portion 10302 is used as a fulcrum to rotate counterclockwise in the figure. It rotates. As a result, the linking member mounting portion 10303 of the pressing member 103 operates to push down the linking member 114, and the crossbar linked to the linking member 114 is also pressed in conjunction with it to operate to push down the movable contact 109. 111 and the fixed contact 107 are urged to open. In the above description, the direction of movement of the link attachment portion 10301 and the cross bar 113 is regulated as shown by the guides 115 and 116 in FIG. Further, the cross bar and the movable contact 109 are engaged with each other by engagement (not shown).
[0013]
FIG. 3 shows a state in which the movable contact 111 and the fixed contact 107 are welded. In this state, since the cross bar 113 is configured to be interlocked with the movable contact 109, its position cannot be changed. Since the handle 101 is always urged by the spring in the direction of the off position, the handle 101 tries to rotate in the direction of the off position in FIG. 2, and the link 102 connected to the handle 101 is pulled up along the direction of rotation of the handle. Although the linking member is interlocked with the crossbar 113, the pressing member 103 receives a force to rotate in the counterclockwise direction with the linking member mounting portion 10303 as a fulcrum, Since the engaging portion 10302 of the pressing member 103 rotates to the position of the rotation preventing portion 10401 provided on the operation plate 104, and the rotation operation is restricted when it contacts the rotation preventing portion 10401, the handle 101 Is controlled to rotate in the off direction, and stops between the on position and the off position.
[0014]
Here, in the absence of the linking member 113 and the rotation preventing portion 10401, there is nothing that restricts the operation of the pressing member 103. Therefore, the handle is moved to the off position by the force by which the handle spring biases the handle 101 in the off direction. Rotate until
[0015]
Therefore, in this embodiment, when the contact is welded, the handle 101 can be stopped between the on position and the off position.
[0016]
Next, a first embodiment of the present invention will be described in detail with reference to the drawings. The first embodiment is an example of a two-pole circuit breaker having a unique structure in which a rotating crossbar has two movable contacts extending substantially symmetrically with respect to the center of rotation. FIG. 4 shows a schematic structure when the circuit breaker of the second embodiment of the present invention is off, and FIG. 5 shows a schematic structure when the circuit breaker is on. FIG. 6 shows a schematic structure in the case where the handle is positioned between on and off in a state where the contact is welded and the operating plate and the pressing member are disengaged due to an abnormal current. is there.
[0017]
4, this circuit breaker includes a handle 1, a pressing member 3, a link 2 connecting the handle 1 and the pressing member 3, fixed contacts 5, 6, fixed contacts 7, 8, and a movable contact. 9 and 10, movable contacts 11 and 12, a rotation member 13, an operation plate 4, and a linkage member 14 that links the pressing member 3 and the rotation member 13.
[0018]
A handle 1 that is rotatably disposed in the case and is urged in the direction of the normally-off position in FIG. 4 by a spring is linked to a pressing member 3 by a link 2. The pressing member 3 is provided with an engaging portion 302 for engaging with the operation plate 4 at one end, and provided with an attaching portion 301 for the link 2 linked to the handle 1 at the other end, and a linkage member mounting for attaching the linkage member 14 therebetween. A unit 303 is provided. The linkage member 14 is attached between the interlocking member attachment portion 303 of the pressing member 3 and the rotation member 13.
[0019]
The rotating member 13 is always urged in the direction in which the movable contacts 11 and 12 are separated from the fixed contacts 7 and 8, and the handle 1 is in a state where the engaging portion 302 of the pressing member 3 and the operation plate 4 are engaged. 5 is turned from the on position in FIG. 5 to the off position in FIG. 4, the pressing member 3 is rotated counterclockwise in the figure by the link 2 interlocked with the handle 1 with the engaging portion 302 as a fulcrum, and When the rotating member 13 is biased in the opening direction, the movable contacts 9 and 10 are separated from the fixed contacts 5 and 8.
[0020]
The linking member 14 is a member provided to operate the pressing member 3 and the rotating member 13 in conjunction with each other. The operation of the pressing member 3 and the rotating member 13 is turned on, turned off, and contact welded. And has a role of regulating the movement of the pressing member 3 during contact welding.
[0021]
Next, the operation from the off time of FIG. 4 to the on time of FIG. 5 will be described. In FIG. 4, the operation plate 4 and the pressing member 3 are engaged. When the handle 1 is rotated from the off position of FIG. 4 to the on position of FIG. 5, the attachment portion of the handle 1 and the link 2 is also rotated. Since the link 2 is linked to the pressing member 3, it presses the pressing member 3, but since the pressing member 3 is engaged with the operation plate 4, the link 2 rotates clockwise with the engaging portion 302 as a fulcrum. It works. As a result, the linking member mounting portion 303 of the pressing member 3 operates to push down the linking member 14, and the rotating member 13 linked to the linking member 14 is also linked to rotate in the direction in which the contact interval is narrowed. 11 and 12 and the fixed contacts 7 and 8 are urged to contact.
In the circuit breaker having the structure shown in FIGS. 4 and 5, since the movable contacts 9 and 10 extend symmetrically about the rotation axis of the rotation member 13, the thickness of the circuit breaker is movable. It has a structure suitable for constructing a thin two-pole circuit breaker with a thickness of one contact.
[0022]
FIG. 6 shows a state in which the operating plate 4 is disengaged in a state where the movable contacts 11 and 12 and the fixed contacts 7 and 8 are welded due to an abnormal current. In this state, the rotating member 13 is urged to rotate in the direction in which the movable contacts 9 and 10 and the stationary contacts 5 and 8 are urged to the open position, but the contact is welded. The position of the rotating member 13 cannot be changed. Since the handle 1 is always biased by the spring toward the off position, the handle 1 tries to rotate in the off position, and the link 2 connected to the handle 1 is pulled up along the rotation direction of the handle. The pressing member 3 receives a force in a direction in which a rotation operation is performed with the linkage member mounting portion 303 as a rotation axis. As a result, the engaging portion 302 rotates downward in the figure, and the link attachment portion 301 tries to rotate upward in the figure, but the engaging portion 302 of the pressing member 3 is a rotation provided on the operation plate 4. The rotation operation is restricted to the position of the movement prevention unit 401, and the rotation operation is restricted when the rotation prevention unit 401 comes into contact. Since the rotation operation is restricted by the linkage member attaching portion 303 and the rotation preventing portion 401, the position of the pressing member 3 is fixed. Therefore, the steering wheel 1 is regulated in the middle of the turning operation in the off direction, and stops between the on position and the off position.
[0023]
Here, when there is no rotation prevention unit 401, there is nothing that restricts the operation of the pressing member 3, so that the handle rotates to the off position by the force by which the handle spring biases the handle 1 in the off direction. .
[0024]
Therefore, in the present embodiment, when the contact is welded, the handle 1 can be stopped between the on position and the off position.
[0025]
In addition, in the Example using the rotation member 13 of FIGS. 4-6, the cooperation member 14 opens and closes a contact in order to cooperate the operation | movement of the pressing member 3 with the rotation member 13, ie, operation of the handle | steering-wheel 1. FIG. This is an indispensable part, and is a necessary part regardless of whether or not the handle position is displayed when the contact that is the object of the present invention is welded. In addition, when the contacts are welded without increasing the cost, it is possible to display the welding according to the position of the handle.
[0026]
【The invention's effect】
According to the circuit breaker of claim 1 of the present embodiment, when the operating plate and the pressing member are disengaged due to abnormal current and the movable contact is welded to the fixed contact, the pressing member engaging portion is Since the rotating member and the pressing member are linked by the linkage member in contact with the rotation preventing portion of the operation plate, the handle cannot move to the off position, and the intermediate position between the on position and the off position. Stop in position. Therefore, there is an effect that the user can recognize the contact welding by the position of the handle and can provide a circuit breaker with improved safety.
[Brief description of the drawings]
1 is a structural diagram when ON (contact is closed) in one embodiment. FIG. 2 is a structural diagram when OFF (contact is opened) in one embodiment. FIG. 3 is a structural line when welding contacts in one embodiment. Figure 4 shows the structure diagram of the time OFF (contacts open) in the first embodiment of the present invention Figure 5 structure view when ON (contacts closed) in the first embodiment of the present invention and FIG. 6 of the present invention Structure diagram of contact welding in the first embodiment [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Handle 2 Link 3 Holding member 301 Link attachment part 302 Engagement part 303 Linking member attachment part 4 Actuation plate 401 Rotation prevention part 5 Fixed contact 6 Fixed contact 7 Fixed contact 8 Fixed contact 9 Movable contact 10 Movable contact DESCRIPTION OF SYMBOLS 11, 111 Movable contact 12 Movable contact 13 Rotating member 14 Linking member 101 Handle 102 Link 103 Pressing member 10301 Link attaching part 10302 Engaging part 10303 Linking member attaching part 104 Actuating plate 10401 Rotation preventing part 105 Fixed contact 107 Fixed contact 109 movable contact 111 movable contact 113 cross bar 114 linking member

Claims (1)

A handle that is pivotably disposed in the case and is always biased in the direction of the off position by a spring, and a link mounting portion that has an engaging portion at one end and is connected to the other end via a link at the other end. A pressing member provided with a movable member, and an engaging plate that is detachably rotatable with respect to the engaging portion of the pressing member, and an operation plate that is spring-biased in the direction of the pressing member, and a fixed contact fixed to the case. A fixed contact, a movable contact disposed opposite to the fixed contact and provided with a movable contact, and constantly urged in a direction in which the movable contact is separated from the fixed contact, operate with the engaging portion of the pressing member. In a state where the plate is engaged, a pressing member that rotates by being pressed by a link provided on the handle with the engaging portion as a fulcrum by rotating the handle from the off position to the on position, and the operation of the pressing member In conjunction with the movable contact The movable contact is mounted and held so that the movable contact is moved toward and away from the fixed contact, and the direction in which the movable contact of each pole extends from the rotating member is substantially symmetric with respect to the rotation center. In a two-pole circuit breaker configured to include a rotating member that interlocks with the operation of the contactor, the operation plate and the pressing member are engaged with each other in a state where the movable contact and the fixed contact are welded. When the handle is moved from the on position to the off position, the linkage member is moved between the engaging portion of the pressing member and the link mounting portion so that the handle stops at an intermediate position between the on position and the off position. And a link provided on the handle when the handle moves from the on position to the off position, and the holding member prevents the pivoting operation performed with the attachment portion of the linkage member as a fulcrum. So that the holding member Circuit breaker, characterized in that a rotation preventing portion for holding the engaging portion to the operation plate.

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