JPS6223002Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to a closing/opening mechanism for a switch.

Prior art Switches equipped with a manually operated closing and opening mechanism are undesirable because if there is a difference in the operation of the movable electrode depending on the strength of the handle operation, there will be a difference in closing and opening performance. If a half-closed or half-open state occurs due to handle operation, problems such as melting and damage will occur at the contact portions of the fixed and movable electrodes.

Purpose The purpose of this invention is to provide a closing and opening mechanism for a switch that allows the movable electrode to always perform stable closing and opening operations regardless of the strength of the handle operation, and that eliminates the risk of half-closing and half-opening operations. .

Embodiment An embodiment embodying this invention will be described below with reference to FIGS. 1 to 16.

Reference numeral 1 denotes the main body case of the gas switch which is airtight and is filled with arc-extinguishing gas such as SF _6. Reinforcement plates 2 are fixed to the inner walls on both the left and right sides, and power supply side bushings 3 are installed for each phase. and load side bushing 4
1 is inserted and fixed. This both bushing 3,
41 has the same internal structure and the same way of fixing to the case 1, so the power supply side bushing 3 will be explained.

As shown in FIG. 2, this power supply side bushing 3 is inserted from the outside into an insertion hole 4 formed through the side wall, and can be locked to the case 1 with a flange 5 protruding from the outer periphery of the central portion. A garter spring 7 is wound around a locking groove 6 recessed in the inner outer periphery. A pressing plate 8 is inserted into the inner part of the case of the bushing 3 through a central insertion hole 8a, and a locking portion 8b protruding toward the main case 1 side is provided around the entire periphery of the insertion hole 8a, and the garter The outer periphery of the spring 7 on the main body case 1 side can be locked. Furthermore, screw holes 9 are threaded at appropriate locations around the insertion hole 8a of the pressing plate 8, and the tips of the screws 10 screwed into the screw holes 9 are inserted into the locking grooves provided in the reinforcing plate 2. It is in contact with 2a. The bushing 3 is fixed to the main case 1 via the garter spring 7 by screwing each screw 10 into the pressing plate 8 and pressing the pressing plate 8 inward to the main case 1.

Reference numeral 11 denotes a positioning ring for a bushing fitted into the insertion hole 4 of the main body case 1 from the outside,
It is interposed between the flange 5 of the bushing 3 and the case 1. Reference numeral 12 denotes a metal annular spacer interposed between the flange 5 of the bushing 3 and the case 1, and has a larger diameter than the positioning ring 11. The compression ratio of the provided O-ring 13 is regulated. Then, the O-ring 13 connects the bushing 3 and the main body case 1.
Ensures airtightness between.

Reference numeral 14 denotes an inner bore that is transparent along the axis of the bushing 3, and a locking step 15 is formed in the center thereof, and an inner end of the bushing 3 adjacent to the locking step 15 is formed in the center thereof. A rotation preventing portion 17 having a pair of opposing fitting grooves 16 recessed along the axial direction is formed on the inner periphery of the portion side.

Reference numeral 32 in FIG. 5 denotes locking recesses provided at an appropriate number of locations (four locations in this embodiment) on the outer periphery of the inner end of the bushing 3. Reference numeral 33 denotes an annular cap having a locking protrusion 34 on the inner periphery of the proximal end as shown in FIG. An annular locking protrusion 35 is formed on the inner periphery of the adjacent central portion of the portion 34, and is fitted to the inner end surface of the bushing 3 so as to be engaged with the inner end surface of the bushing 3, and rotates relative to the bushing 3. He is unable to move.

Reference numeral 18 denotes a conductor rod inserted into the inner cavity 14 from the outer end side of the bushing 3, and a flange 19 protruding from the center thereof to be locked to the locking step 15 is formed to prevent rotation. On the outer periphery corresponding to the portion 17, a rotation preventing protrusion 20 that is fitted into the fitting groove 16 is formed to protrude along the length direction, thereby making it impossible to rotate relative to the bushing 3. Reference numeral 21 denotes a threaded portion formed on the outer periphery of the base end of the conductor rod 18. 2
Reference numeral 2 denotes a fixed electrode inserted into the inner cavity 14 from the inner end of the bushing 3, the base end of which is connected to the conductor rod 18.
It is screwed into the threaded portion 21 of. A flange 23 protruding from the outer periphery of the tip of the fixed electrode 22 with a diameter smaller than the inner diameter of the locking protrusion 35 of the cap 33 and a flange 19 of the conductor rod 18 engage with the inner end surface of the bushing 3, respectively. Both 1 are tightened by tightening the conductor bar 18 until it is latched to the stop portion 15.
8 and 22 are fixed to the bushing 3.

Note that a cylindrical buffer member 24 made of a soft synthetic resin material is provided on the outer periphery of the detent portion 17 of the conductor rod 18.
A packing 25, a washer 26, and a spring washer 27 made of asbestos are interposed between the flange 19 and the locking step 15.

Reference numeral 28 is a lead wire crimped into the tip of the conductor rod 18 and led out from the outer end of the bushing 3. Reference numeral 29 denotes an insulating and elastic filling member that is filled in the inner cavity 14 of the bushing 3 from the locking step portion 15 to the outer end side.

Reference numeral 30 denotes a locking protrusion protruding annularly from the outer periphery of the distal end side of the flange 23 of the fixed electrode 22,
It is locked to the locking protrusion 35 of the cap 33, and its outer periphery is fitted into the inner periphery of the cap 33. 31
is an O-ring disposed between the locking protrusion 30 and the inner end surface of the bushing 3, its outer circumference is connected to the locking protrusion 35 of the cap 33, and its inner circumference and compression rate are connected to the flange of the fixed electrode 22. 23, respectively, to ensure airtightness when the fixed electrode 22 is fixed to the bushing 3.

As shown in FIGS. 2 and 4, reference numeral 36 denotes a suitable number (four in this embodiment) of anti-rotation recesses formed at intervals on the periphery of the locking protrusion 30 of the fixed electrode 22. After the fixed electrode 22 is fixed to the bushing 3, a part of the inner periphery of the corresponding cap 33 is heated and the detent protrusion 37 eluted into the detent recess 36 engages with the cap 33 and the fixed electrode 22. This makes it impossible to rotate relative to the

Reference numeral 38 denotes a contact portion having a spherical surface such that its central portion protrudes from the tip surface of the fixed electrode 22;
As shown in the figure, an arc-proof metal 39 having a smaller protrusion than the central portion of the contact portion 38 is soldered to the adjacent upper portion.

Next, a description will be given of the movable electrode section which is operated to open and close with respect to the fixed electrode 22 of the power supply side bushing 3.

As shown in FIG. 1, 45 is a square prism-shaped rotation shaft installed in the front-rear direction below the main body case 1 so as to be interposed between the bushings 3 and 41 of each phase, and as shown in FIG. 6. Both ends 45
a and 45b are formed in a cylindrical shape and are rotatably supported by a pair of bearings 46 fixed to the lower part of the main body case 1. Note that 47 is the bearing hole 46 of the bearing 46.
The bearing sleeve 48 fitted in a is a retaining pin attached to both ends 45a and 45b of the rotating shaft 45, respectively.

49 is an arm attached to the right side of the rotating shaft 45 corresponding to the bushings 3 and 41 of each phase as shown in FIGS. A bolt 5 is inserted from the right side of the base end and is fitted onto the rotating shaft 45 at a mounting portion 50 recessed in a U-shape on the left side of the base end so as to be close to the bottom.
1 is fixed to the right side of the rotating shaft 45 via a plurality of contact pressure adjustment plates 52. 53 is arm 4
A rectangular insertion hole 54 is formed through the upper wall 49a of the insertion hole 53.

Reference numeral 55 denotes a fixed plate made of a ferromagnetic material such as iron that is screwed 56 to the lower surface of the upper wall 49a, and its left edge is slightly protruded from the left edge of the upper wall 49a.
A through hole 55a having a smaller diameter than the insertion hole 54 is formed approximately at the center corresponding to the insertion hole 54. 57 is the insertion hole 54 of the arm 49 and the fixing plate 5
A split pin 58 is a support rod that is loosely inserted into the through hole 55a of No.
The upper surface of the washer 59 is engaged with the washer 59, and both ends of a compression spring 60, which is wound around the washer 59 and the upper surface of the fixed plate 55 and serves as a biasing member, are in contact with each other. The base end portion of the movable electrode portion 61 is loosely inserted into the lower end portion of the support rod 57, and the movable electrode portion 61 is locked by a pin 62 inserted and fixed to the lower end portion.
The compression spring 60 always urges the base end portion of the movable electrode portion 61 toward the fixed plate 55 side.

Note that the movable electrode section 61 is configured as follows.

Reference numeral 65 denotes a movable contact made of an elastic silver-plated copper plate, and at its base end there is a braided wire 67 with one end attached to the tip of the fixed electrode 22 of the load-side bushing 41 with a screw 66. The other end is secured with a rivet 68, and a through hole 69 for loosely inserting the support rod 57 is formed in the center.

As shown in FIGS. 11 and 12, 72 is a channel-shaped adsorption member made of a ferromagnetic material that is rivet 73 attached to the lower surface of the base end of the movable contact 65, and has a through hole in the movable contact 65. A through hole 74 for loosely inserting the support rod 57 is formed corresponding to the hole 69, and the pin 62 of the support rod 57 is locked at the lower surface of the hole 74. Then, the end surfaces 72a of both sides are connected to the fixing plate 55 so that a magnetic circuit can be formed with the fixing plate 55.
When a current flows through the movable contact 65, the magnetic resistance is reduced (in the direction of the arrow in FIG. 12), that is, the attracting member 72 is attracted to the fixed plate 55. It's getting old.

75 is an upwardly extending 90 at the center of the movable contact 65.
The movable contactor 65 can be rotated by the locking portion 75, which is bent to a smaller angle than .degree., and is locked to the left side edge of the fixed plate 55.

76 connects the movable contact 65 via the locking portion 75.
The contact portion is bent upward in a stepwise manner at the tip thereof, and is capable of slidingly contacting the upper portion of the contact portion 38 of the power supply side bushing 3 during the closing/opening operation of the arm 49. Further, when the arm is open, it is designed to have a sufficient insulation distance from the contact portion 38.

Reference numeral 77 is an arc-proof metal soldered to the upper part of the contact portion 76, and is adapted to slide into contact with the arc-proof metal 39 of the power supply side bushing 3 during the closing/opening operation of the arm 49. The arc-resistant metal 77 contacts the arc-resistant metal 39 before the contact parts 38, 76 contact when it is closed, and the contact parts 38, 76 contact the arc-resistant metal 39 when released.
is adapted to come into contact with the arc-proof metal 39 immediately before separating. Reference numeral 78 is a stirring plate made of heat-resistant synthetic resin, which is riveted 79 on the right side of the contact portion 76, and both sides and the upper portion thereof are connected to the contact portion 76.
stands out from

The movable contactor 65 and the adsorption member 72 constitute the movable electrode section 61.

When this movable electrode part 61 is in the open state as shown in FIG.
Due to the biasing force of the compression spring 60, the fixing plate 55
is in contact with. When the arm 49 is rotated counterclockwise by the rotation shaft 45 during the closing operation, the arc-proof metal 77 of the movable contact 65 first touches the power supply side bushing 3 at its upper part as shown by the chain line in FIG. It comes into contact with the arc-resistant metal 39. When the movable contact 65 is further rotated counterclockwise, the base end of the movable contact 65 resists the biasing force of the compression spring 60 with the abutment point as the point of force and the locking portion 75 as the fulcrum (center). while rotating clockwise. Due to the clockwise rotation of the movable contact 65 and the counterclockwise rotation of the arm 49, the arc-proof metal 77 of the movable contact 65 comes into sliding contact with the arc-proof metal 39 of the bushing 3,
Finally, the contact portion 76 connects to the contact portion 38 of the bushing 3.
Both 77 and 39 are separated by contacting the upper part of the same. Thereafter, the contact portion 76 slides downward along the curved surface of the contact portion 38 of the bushing 3, and the arm 4
When the predetermined closing operation 9 is completed, the contact portion 76 comes into contact with the center portion of the contact portion 38 of the power supply side bushing 3. At this time, the contact portion 76 is connected to the compression spring 60.
A constant contact pressure is always maintained against the contact portion 38 of the bushing 3 by the urging force.

In the case of a particularly large current at the time of the above-mentioned power-on and subsequent energization, the fixed electrode 2 of the bushing 3
An electromagnetic repulsion force acts between the movable electrode 61 and the contact portion 76 of the movable contact 65, but at the same time, a magnetic circuit is formed between the adsorption member 72 disposed on the base end side of the movable electrode 61 and the fixed plate 55. Therefore, the suction member 72
5, the proximal end portion of the movable contact 65 is urged toward the fixed plate 55 around the locking portion 75, and the contact portion 76 resists the electromagnetic repulsion force to close the contact portion on the bushing side. 38.

When the movable electrode section 61 is opened from the closed state shown in FIG. The base end portion of the movable contactor 65 is rotated counterclockwise around the locking portion 75 via. By the clockwise rotation of the arm 49 and the counterclockwise rotation of the movable contact 65, the movable contact 65 is brought into sliding contact with the upper part of the contact portion 38 of the power supply side bushing 3, and then the arc-proof metal 77
is brought into contact with the arc-proof metal 9 of the bushing 3, and the contact portions are separated. Next, both arc-resistant metal 7
7 and 39 are separated after sliding into contact with each other.

On the other hand, as shown in FIG. 8, the base end of the movable contact 65 is rotated toward the fixed plate 55 by the biasing force of the compression spring 60 around the locking portion 75, and then
It comes into contact with the fixing plate 55 as shown in the figure.

When the arc-resistant metals 77 and 39 are separated, an arc is generated between them, but the operation of the stirring plate 78 stirs the gas in the area where the arc occurs and blocks it, ensuring a sufficient insulation distance. The opening operation is then completed.

Next, the arm 4 on which the movable electrode section 61 is disposed
The closing/opening mechanism that operates the closing/unloading mechanism 9 will be explained.

Reference numeral 81 indicates a mounting hole provided through the upper part of the front side wall of the main body case 1 as shown in FIG. 6, and reference numeral 82 indicates the mounting hole 8.
A pair of bearing metals 83 are fitted into both the inner and outer ends of the supporting cylinder, which is welded to maintain airtightness after being inserted into the support cylinder. Reference numeral 84 denotes a handle shaft rotatably inserted into the support tube 82, and a plurality of fitting grooves 84a are recessed in the outer periphery of the support tube 82, corresponding to approximately the center thereof. An O-ring 85 is wrapped inside to ensure airtightness with respect to the support tube 82.

Reference numeral 86 denotes a handle fitted to the outer end of the handle shaft 84, and the handle shaft 84 is inserted into a mounting hole 87a formed through the boss 87 in the center thereof, and is secured by a taper pin 88 inserted from the outer periphery of the boss 87. Fixed.

Reference numeral 89 is a drive lever fixed to the inner end of the handle shaft 84, and a shaft 91 is rotatably attached to the lower end of the drive lever. 92 is a U-shaped bearing fixed to the main body case 1 at a position to the right of the rotating shaft 45, and 93 is a T-shaped base end portion relative to the bearing 92. is a guide rod rotatably supported, and its tip is inserted into the opening 90a at the tip of the guide tube 90 so that it can slide.

The guide tube 90 and the guide rod 93 constitute a reversing section. A compression spring 94 is wound around the outer periphery of the guide cylinder 90, and one end of the spring 94 is engaged with the lower end of the drive lever 89, and the other end is engaged with the bearing 92. Then, the drive lever 89 is rotated counterclockwise in FIG. 15, so that the mounting portion of the shaft 91 is aligned with the axis of the handle shaft 84 and the axis of the base end of the guide rod 93, as shown in FIG. When the dead point X on the line connecting is exceeded, the drive lever 89 is biased counterclockwise. Conversely, the drive lever 89 is
When the shaft 91 is rotated clockwise in the figure and the attachment portion of the shaft 91 exceeds the dead point X as shown in FIG. 14, the compression spring 94 biases the drive lever 89 clockwise. .

As shown in FIG. 6, a guide plate 95 is rotatably supported on the handle shaft 84 via a bearing metal 96 between the drive lever 89 and the support tube 82, and the drive lever is attached to the tip of the guide plate. A pin 97 protruding to the side is fixed. Reference numeral 98 denotes an operating lever whose base end is fixed to the front end 45a of the rotation shaft 45, and an elongated hole 98a is formed in the distal end thereof in the length direction, and the pin is inserted into the elongated hole 98a. 97 is slidably inserted therethrough. When the pin 97 rotates clockwise or counterclockwise about the handle shaft 84 via the guide plate 95, the pin 97 moves into the elongated hole 9.
By sliding inside 8a, the rotation shaft 45 is rotated counterclockwise or clockwise, respectively.

As shown in FIG. 15, 99a and 99b are a pair of operating claws that project leftward from the upper and lower parts of the left side of the drive lever 89, respectively, and the pin 97 is always positioned between the two 99a and 99b. It corresponds to the same pin 97 so that it can be locked.

When the drive lever 89 is rotated clockwise as shown in FIG. 14 when the movable electrode section 61 is in the open state, the actuation claw of the drive lever 89 will be opened immediately after the mounting portion of the shaft 91 crosses the dead point X. 99b
is locked by a pin 97, allowing the operating lever 98 to rotate counterclockwise. Further, when the movable electrode section 61 is in the closed state, the drive lever 89 is in the 16th position.
When the drive lever 89 is rotated counterclockwise as shown in the figure, the operating claw 99a of the drive lever 89 is engaged with the pin 97 immediately after the attachment portion of the shaft 91 passes the dead point X, and the operating lever 98 is rotated clockwise. It is designed so that it can be rotated.

Reference numeral 100 denotes a holding lever fixed to the rear end 45b side of the rotation shaft 45 with its tip facing downward;
01 is a shaft 10 which is rotatably positioned with its tip above both sides of the tip of the holding lever 100.
a pair of C-shaped retaining links attached twice;
The other end of a tension spring 103 serving as a biasing member whose one end is engaged with a mounting member 104 disposed on the upper wall of the main body case 1 is attached to both ends thereof.
The biasing force of this tension spring 103 is the same as that of the compression spring 9.
4, and when the rotation shaft 45 is rotated clockwise or counterclockwise by the urging force of the compression spring 94, the attachment point to the mounting member 104 and the axis of the rotation shaft 45 The abutting portions of the shafts 102 are designed to each cross a dead point Y on the line connecting the center. The tension spring 103 holds the movable electrode section 61 in the closed state or in the open state.

Note that 105 is a stopper that restricts the amount of rotation of the holding lever 100 when the holding lever 100 is rotated clockwise, and is fixed to the main body case 1 via a fixing plate 106.

Now, this closing/opening mechanism is operated by the handle 8 when the movable electrode part 61 is in the open state as shown in FIG.
When turning 6 clockwise, the handle shaft 84
From the state shown in FIG. 13, the drive lever 89 is rotated clockwise while resisting the biasing force of the compression spring 94. When the drive lever 89 applies force to the compression spring 94 and the mounting portion of the shaft 91 exceeds the dead point X as shown in FIG. It is rotated clockwise around the handle shaft 84 via the guide plate 95. This pin 9
7 rotates the operating lever 98 counterclockwise, and at the same time, the rotation shaft 45 is also rotated in the same direction. Then, the holding lever 100 is also rotated counterclockwise while exerting force on the tension spring 103 by the rotation of the rotation shaft 45, and when the attachment portion of the shaft 102 exceeds the dead point Y, the biasing force of the compression spring 94 and the tension spring 103 is As a result, the rotation shaft 45 continues to rotate. When the movable electrode section 61 is completely inserted through the rotation shaft 45 and the arm 49, the tension spring 103 maintains the inserted state.

Furthermore, when the movable electrode portion 61 rotates the handle 86 of the closing mechanism counterclockwise from the closed state, the drive lever 89 resists the biasing force of the compression spring 94 via the handle shaft 84 from the state shown in FIG. while rotating counterclockwise. When the drive lever 89 forces the compression spring 94 and the mounting portion of the shaft 91 exceeds the dead point X as shown in FIG. Guide plate 9
5 and rotate counterclockwise around the handle shaft 84. This rotation of the pin 97 causes the operating lever 98 to rotate clockwise, and at the same time, the rotation shaft 45 is also rotated in the same direction. Then, the holding lever 100 is also rotated clockwise while exerting force on the tension spring 103 by the rotation of the rotation shaft 45.
When the attachment portion of the shaft 102 exceeds the dead point Y, the rotation shaft 45 continues to rotate due to the urging force of the compression spring 94 and the tension spring 103. Then, the opening operation of the movable electrode section 61 is completed with the operating lever 98 being rotationally limited by the stopper 105.

It should be noted that this invention is not limited to the above-mentioned embodiments, and may be modified as desired without departing from the spirit of this invention.

As detailed above, this invention consists of a drive lever that is disposed inside the main body case and fixed to the handle shaft, and a drive lever that is supported so as to be rotated about one end, and the other end is rotatably connected to one end of the drive lever. As the pivoted reversing section and the drive lever rotate,
When the axial attachment point of the drive lever and the reversing section is moved from one side to the other beyond the dead point on the straight line connecting the axis of the handle shaft and the support point of the reversing section, the drive lever has a direction of rotation of the handle shaft. A compression spring is interposed between the support point of the reversing part and the shaft-mounted end to apply a rotational force in the same direction as , and an actuator fixed to the rotation shaft for closing and opening the movable electrode. a lever, a guide plate rotatably pivoted to the handle shaft and having a protruding pin at its tip that is slidably inserted into the long hole of the actuating lever; and the driving lever is actuated by a compression spring. When the drive lever and the reversing section are rotated to close and open, when the axis attachment point of the drive lever and the reversing section exceeds the dead point, one of them is selectively locked to the pin of the guide plate, so that the actuation lever is turned on. A pair of operating claws provided on a drive lever that rotates closing and opening, and a rotation shaft that rotates when the operating lever rotates closing and opening;
In order to maintain the lever in the open state, a retaining link is attached to the tip of the retaining lever to which the rotating shaft is fixed, and further,
The handle is operated by constructing a locking mechanism in which the retaining link is biased by a tension spring and the dead point connecting the base end attachment part and the rotating shaft is closed or opened so that the shaft can cross over from one side to the other. Regardless of the strength of
Furthermore, the rotary shaft always maintains the closed state or the open state until the actuating claw is engaged with the pin, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a front view of a gas switch showing an embodiment of this invention, Fig. 2 is a front cross-sectional view of the bushing, and Fig. 3 is a cross-sectional view of the detent portion of the inner cavity of the bushing. Figure 4 is a right side view of the bushing, Figure 5 is a cross-sectional view of the cap of the bushing, Figure 6 is a right side view of the gas switch, and Figure 7 is a front sectional view when the movable electrode part has been inserted. , FIG. 8 is a front sectional view of the movable electrode part when it is in operation, FIG. 9 is a front sectional view when the opening is completed, and FIG. 10 is a partially cutaway front view of the gas switch in the same state as FIG. 9. Fig. 11 is a perspective view of the movable contact, Fig. 12 is a sectional view showing the operation of the fixed plate and suction plate, Fig. 13 is a front view when the opening of the closing/opening mechanism is completed, and Fig. 14 is also Fig. 13. FIG. 15 is a front view of the closing operation from the state shown in FIG. 15, and FIG. 16 is a front view of the opening operation from the state of FIG. Main body case 1, rotating shaft 45, movable electrode (part) 6
1. Drive lever 89, shaft 91, reversal part (guide cylinder) 90, reversal part (guide cylinder) 93, pin 97,
Actuation lever 98, actuation claws 99a, 99b, biasing member (tension spring) 103, dead point X.

Claims (1)

[Scope of utility model registration request] A handle shaft 8 is arranged inside the main body case 1.
a drive lever 89 fixed to the drive lever 89; and a reversing part 90, which is supported so as to be rotated about one end thereof and whose other end is rotatably pivoted to one end of the drive lever 89.
As the drive lever 89 rotates, the point where the axis 91 of the drive lever 89 and the reversing section 90 arrives crosses the dead point X on the straight line connecting the axis of the handle shaft 84 and the support point of the reversing section 90. It is interposed between the support point of the reversing part 90 and the end on the pivoting side so as to apply a rotational force to the drive lever 89 in the same direction as the rotational direction of the handle shaft 84 when the drive lever 89 is moved from one side to the other. compression spring 94 and movable electrode 61
an actuating lever 98 fixed to the rotating shaft 45 for closing and opening the lever; and a pin 97 rotatably attached to the handle shaft 84 and slidably inserted into the elongated hole 98a of the actuating lever 98. a guide plate 95 protruding from the tip thereof, and the drive lever 8.
The shaft 9 between the drive lever 89 and the reversing portion 90 is
When the first landing point exceeds the dead point
When the actuating lever 98 is engaged, the actuating lever 98 is turned on.
A pair of operating pawls 99a and 99b are provided on the drive lever 89 for opening and rotating, and a pair of operating pawls 99a and 99b are provided on the drive lever 89 to open and rotate the rotating shaft 45 in order to keep the rotating shaft 45 in the closed and open state when the operating lever 98 is rotated in and out. A retaining link 101 is connected to the shaft 10 at the tip of the retaining lever 100 to which the retaining lever 100 is fixed.
The holding link 101 is further biased by the tension spring 103, and when the dead point Y connecting the base end attachment part 104 and the rotating shaft 45 is closed or opened, the shaft 102 is moved from one side to the other. A closing/opening mechanism for a switch, characterized by comprising a locking mechanism and a locking mechanism.