JP3641734B2 - Switchgear - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switchgear provided with, for example, a circuit breaker, a disconnector, and the like. Specifically, the operation of the closing button is transmitted to the contact and closed, and this closing state is maintained until the releasing button is operated, for example, The present invention relates to a circuit breaker latch mechanism.
[0002]
[Prior art]
FIG. 6 is a schematic side view showing a configuration of a latch mechanism of a conventional circuit breaker. In the figure, reference numeral 12 denotes a closing button, which is exposed on the surface of the circuit breaker case 1. In the case 1, shafts 10, 11, 19 and a cam shaft 6 are provided in a horizontal direction perpendicular to the pressing direction of the closing button 12. The shaft 10 is disposed behind the closing button 12 and penetrates the central portion of the closing latch 9 whose lower end is in contact with the back surface of the closing button 12 so as to be rotatable. The cam shaft 6 is rotatably attached to the upper part of the shaft 10 and penetrates and holds a cam 7 having a large diameter portion on a half circumference thereof. The large diameter portion is provided with a cam roller 8 around an axis parallel to the cam shaft 6 so that the upper end portion of the closing latch 9 can be contacted.
[0003]
The shaft 11 is provided below the camshaft 6 and penetrates the distal end portion of the long portion of the main lever 13 of a substantially horizontal L shape (a triangle with a rounded corner or a dent on one side). doing. A roller 15 that rotates about an axis parallel to the shaft 11 is attached to the distal end (upper end) of the main lever 13, and the operation of the main lever 13 is performed at the lower end of the short portion, and the main contact point below it. A link lever 14 for transmitting to 21 is connected. The link lever 14 receives a force for removing (opening) the main contact 21 by a release spring (not shown). The shaft 19 is provided on the side of the cam shaft 6 and passes through the upper part of the vertically long holding and holding latch 16 so as to be rotatable, and the lower end thereof can be brought into contact with the roller 15. A return spring 17 is attached to the inner surface of the case 1 to urge rotation of the closing latch 16 in one direction at the lower end portion.
[0004]
Further, a release button 20 is provided above the input button 12, and when the release button 20 is operated, the input holding latch 16 is rotated in the other direction.
[0005]
Next, the operation of this latch mechanism will be described.
FIG. 7 shows that the main contact 21 is in an open state (in which the link lever 14 is raised), and a closing spring (not shown) that biases the cam 7 in one rotation direction with respect to the cam shaft 6 is in a stored state. Indicates a case. The cam roller 8 is engaged with the closing latch 9 and stops the rotation of the cam 7 urged in one rotation direction by the closing spring. When the closing button 12 is pressed in this state, the closing latch 9 rotates in one direction around the shaft 10, so that the cam roller 8 and the closing latch 9 are disengaged, thereby causing the cam 7 to move in one direction. Rotate to.
[0006]
Then, the roller 15 is pushed by the large diameter portion of the cam 7, and the main lever 13 rotates in one direction around the shaft 11. At this time, the insertion holding latch 16 is kicked by the roller 15 and rotates in the other direction around the shaft 19 because there is a portion overlapping the locus of movement of the roller 15. Thereafter, when the main lever 13 further rotates and the roller 15 further descends, the making and holding latch 16 returns to one direction by the urging of the return spring 17. When the above-described closing operation is performed, the trip spring is stored, so that the main lever 13 is given a rotational force in the other direction around the shaft 11. However, since the leading end of the making and holding latch 16 is maintained at a position where it contacts the roller 15, rotation of the main lever 13 in the other direction is suppressed, and the making state shown in FIG. 9 is maintained.
[0007]
In order to release the closing state, by operating the trip button 20 shown in FIG. 6, the closing holding latch 16 is rotated in the other direction and returned to the original position.
[0008]
[Problems to be solved by the invention]
Since the conventional circuit breaker latch mechanism is configured as described above, the throwing latch 16 is kicked by the roller 15 to cause an unstable movement after the throwing operation is held. Exists. In addition, since the engagement and disengagement of each part is delicate, the positional relationship for the throwing holding latch 16 to suppress the rotation of the main lever 13 in the other direction requires elaborateness. And high-precision position adjustment at the time of assembly is necessary.
[0009]
The present invention has been made in view of such circumstances, and is provided with a curved surface having a shape along a turning locus of a lever pin attached to the lever, and an end portion of the curved surface, and the lever pin is engaged with the curved surface. It is an object of the present invention to provide an opening / closing device having a closing holding latch having an engaging portion for providing a stable movement during a closing operation, excellent holding state in a closing state, and a simple structure. And
[0010]
[Means for Solving the Problems]
In the opening and closing device that transmits the operation of the closing button to the contact point, closes it, and maintains this closing state until the release button is operated, the lever that rotates by the rotation of the cam The lever pin is mounted substantially parallel to the pivot shaft, and the insertion holding latch is provided on the curved surface that follows the pivot locus of the lever pin and the end of the curved surface so that the lever pin is engaged. And the lever pin is prevented from rotating by the engagement of the lever pin with the engaging portion.
[0011]
According to a second aspect of the present invention, in the first aspect of the present invention, the insertion holding latch is pivotally supported so as to rotate based on the operation of the trip button, and the engagement of the lever pin with the engaging portion is It is characterized in that it is configured to be detached by this rotation.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
FIG. 1 is a perspective view showing a latch mechanism of a switchgear according to the present invention, and shows a case of a circuit breaker. In the figure, reference numeral 60 denotes a closing button, which is attached so as to be exposed to a case (not shown) of the switchgear. Between the side walls of the case, three shafts 55, 66, 72 and a cam shaft 56 are straddled in a horizontal direction perpendicular to the pressing direction of the closing button 60. The shafts 55, 66, and 72 are fixed to the case, and the cam shaft 56 is rotatably attached.
[0013]
The shaft 55 is composed of a “<”-shaped plate having an upright portion extending at the upper end and a bent portion extending at the lower end. The shaft 55 includes a closing latch 58 provided at the back of the closing button 60. It penetrates the upper part of the "<" shape so that it can rotate in the thickness direction. The closing button 60 presses one surface of the upright portion of the closing latch 58 on the back surface thereof, and a return spring 65 biased in the direction opposite to the pressing is applied to the other surface of the upright portion. Touched.
[0014]
A large gear 57 and a cam 69 are fixed to a cam shaft 56 provided at the lower back of the shaft 55 so as to correspond to both sides of the closing latch 58 at a predetermined interval. A roller 63 that rotates about an axis parallel to the camshaft 56 is attached to an appropriate position on one surface of the large gear 57 on the closing latch 58 side, and the large gear 57 is rotated in one direction. An energizing spring 62 is provided. The roller 63 is fitted with a "<"-shaped concave portion of the closing latch 58, so that the rotation of the cam shaft 56 is suppressed.
[0015]
Further, at a position corresponding to the lower side of the cam 69 of the shaft 66 provided at the lower back of the cam shaft 56, there is a main lever plate 50 composed of two inverted substantially trapezoidal plates having a depression on the upper side. One end side is inserted in the thickness direction so as to be freely rotatable. A main lever pin 52 is provided in parallel with the shaft 66 so as to pass through two inverted substantially trapezoidal plates on the other end of the main lever plate 50 through the recess. In addition, at the bank 66 side bank portion of the recess, a roller 51 that rotates around an axis parallel to the shaft 66 for contacting with the peripheral surface of the cam 69 has a form in which about a quarter of the peripheral surface protrudes. Attached between two inverted substantially trapezoidal plates.
[0016]
The shaft 55 penetrating the closing latch 58 is located at the position corresponding to the upper side of the main lever pin 52, as shown in FIG. The insertion holding latch 53 is rotatable around the shaft 55. The front surface (thickness portion) of the foot portion of the loading and holding latch 53 has a curved surface shape along the turning locus of the main lever pin 52 fixed to the main lever plate 50 around the shaft 66. A notch 59 for engaging with the main lever pin 52 is formed at the lower end of the. The back surface (thickness portion) of the foot is in contact with a return spring 64 that presses this surface, and the upper end of the back surface is pressed to rotate the input and holding latch 53 in one direction. A button 54 is provided.
[0017]
Below the main lever plate 50, a roller 71 that rotates about an axis parallel to the shaft 66 is attached between two inverted substantially trapezoidal plates. Under the roller 71, a shaft 72 provided at the lower back of the shaft 66 is pivotally held in the middle so that the main lever plate 50 is swung around the shaft 72. One end of a horizontally long link lever 70 for transmitting the operation to the main contact 21 is brought into contact, and the lower surface on the one end side is biased upward by a tripping spring 61. The other end of the link lever 70 is attached by a pin 73 to a shaft fixed to one side member of the main contact 21.
[0018]
The operation of the latch mechanism configured as described above will be described with reference to FIGS.
FIG. 3 shows the case where the main contact 21 is in the open state (the other end of the link lever 70 is lowered) and the closing spring 62 that urges the cam 69 in the rotational direction with respect to the cam shaft 56 is in the accumulated state. Indicates. In FIG. 3, the roller 63 attached to the large gear 57 is engaged with the cutout portion of the closing latch 58, and the cam 69 is prevented from rotating in one direction. At this time, the large diameter portion of the cam 69 is in a position where it does not contact the roller 51 of the main lever plate 50.
[0019]
When the closing button 60 is operated in this state, the upright portion of the closing latch 58 is pushed, whereby the closing latch 58 rotates in one direction around the shaft 55. Then, the engagement between the closing latch 58 and the roller 63 is released, and the cam 69 rotates in one direction around the cam shaft 56. As the cam 69 rotates, the roller 51 is gradually pushed down by the gradually increasing peripheral surface of the large diameter portion, and the main lever plate 50 rotates in one direction around the shaft 66. At this time, the main lever pin 52 also arcs downward together with the main lever plate 50, and moves downward along the curved surface 67 of the closing holding latch 53 (FIG. 4). At this time, the closing latch 53 receives the rotational force in the other direction around the shaft 55 by the urging force of the return spring 64, so the main lever pin 52 reaching the lower end of the curved surface 67 is provided here. Rotate in the other direction so as to fit in the notch 59. Here, the cam 69 is designed so that the main lever pin 52 is not excessively pushed down by the large-diameter portion of the cam 69 and is not released below the notch 59.
[0020]
When the main contact 21 is closed by the closing operation, one end of the link lever 70 is lowered, so that the tripping spring 61 is stored. Accordingly, a force is applied to push up one end side of the link lever 70 and rotate the main lever plate 50 connected to the link lever 70 in the other direction with respect to the shaft 66, but the main lever pin 52 attached to the main lever plate 50 Since the engaging portion 53 is engaged with the notch 59 of the making and holding latch 53, the rotation of the main lever plate 50 is suppressed and the making state is held.
The cam 69 that has pushed down the roller 51 of the main lever plate 50 by the large diameter portion continues to rotate as it is by the urging force of the closing spring 62, and has already been returned to its original position by the return spring 65. The rotation of the roller 63 is stopped when the roller 63 is engaged with the roller 63.
[0021]
In order to release the closing state, as shown by a broken line arrow in FIG. 5, by operating the trip button 54, the closing holding latch 53 is rotated in one direction, and the main lever pin 52, the notch portion 59, Is disengaged. As a result, the force that prevents the main lever plate 50 from rotating in the other direction based on the return spring 61 is eliminated, and the main lever plate 50 rotates in the other direction. As a result, one end of the link lever 70 is raised, the other end is lowered, and the main contact 21 is opened.
[0022]
As described above, in the latch mechanism of the switchgear according to the present invention, in the closing operation in which the main lever plate 50 rotates, the closing holding latch 53 is not kicked by the main lever pin 52, and the contact state between the two is maintained. Thus, there is no unstable operation area as in the conventional holding and holding latch. In addition, the structure is simple, and the accuracy required in parts and assembly operations is not as high as in the past. Further, in the closed state, the main lever pin 52 is engaged with the notch 59, and this engagement is not released when the trip button 54 is not operated, so that the holding holdability is excellent.
[0023]
In the above description, the case where the latch mechanism is attached to the circuit breaker has been described. However, the present invention is not limited to this and can be applied to other switchgear such as a disconnecting switch.
[0024]
【The invention's effect】
As described above, in the opening / closing device according to the first aspect, when the lever is rotated by the operation of the closing button, the contact between the lever pin attached to the lever and the closing holding latch is maintained on the rotation locus of the lever pin . The closing holding latch is not kicked by the lever pin as in the prior art, and the movement at the time of closing is stable. In addition, since the engaging portion that the lever pin engages in the closing state is provided in the closing holding latch, the holding property in the closing state is also excellent. Further, since the engagement structure is simple, the machining accuracy required for each component is lowered, and accordingly, the position adjustment during the assembly work does not require fineness.
[0025]
In the opening / closing device according to claim 2, the present invention has an excellent effect, for example, the closing state in which the lever pin is engaged with the engaging portion can be easily released by the operation of the trip button.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a switchgear according to the present invention.
FIG. 2 is an enlarged view of a closing holding latch shown in FIG.
3 is a side view showing a main contact opening state of the switchgear of FIG. 1. FIG.
4 is a side view showing a charging process of the switchgear of FIG. 1. FIG.
5 is a side view showing a main contact closing state in which the closing operation of the switchgear of FIG. 1 has been completed. FIG.
FIG. 6 is a schematic side view showing a conventional switchgear.
7 is a side view showing a main contact open state of the switchgear of FIG. 6. FIG.
8 is a side view showing a charging process of the switchgear shown in FIG. 6. FIG.
9 is a side view showing a main contact closing state in which the closing operation of the switchgear of FIG. 6 has been completed. FIG.
[Explanation of symbols]
21 Main contact, 50 Main lever plate, 52 Main lever pin, 53 Input latch
54 Trip button, 59 Engagement section (notch), 60 Insert button, 67 curved surface, 69 cam.

Claims (2)

In the switchgear that transmits the operation of the closing button to the main contact, closes it, and holds this closing state until the release button is operated,
A cam that rotates by operating the input button;
A lever to rotate the abutment drive the large-diameter portion of the cam by rotation of the cam,
A lever pin mounted substantially parallel to the pivot axis of the lever Niso,
A charging and holding latch having a curved surface that is rotatably supported and forms a shape along a rotation trajectory of the lever pin, and an engaging portion that is provided at an end of the curved surface and engages with the lever pin ;
A spring that presses the making and holding latch so that the curved surface of the making and holding latch contacts the lever pin;
An opening / closing device characterized in that the lever is prevented from rotating in the main contact opening direction by the engagement of the lever pin with the engaging portion.   The insertion holding latch is pivotally supported so as to rotate based on the operation of the release button, and the engagement of the lever pin with the engaging portion is configured to be released by this rotation. The switchgear according to claim 1.

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