JP5284738B2 - Protective ground switch and railway vehicle - Google Patents

Description

  The present invention relates to a protective ground switch for grounding the other end side of an insulator that is supported at one end on the ground side and connected to the energization side at the other end to insulate each other, and a railroad equipped with the protective ground switch Regarding vehicles.

  BACKGROUND ART Conventionally, an insulator that insulates a grounding side and a current-carrying side has been used, for example, in a railway vehicle to support a pantograph with respect to a vehicle body while insulating the pantograph. On the other hand, when there is a problem with a railway vehicle or surrounding equipment, it may be necessary to stop itself quickly and stop the power supply from the overhead line so that the next railway vehicle does not enter. is there. In this case, for example, it is conceivable to contact the substation equipment by wireless communication or the like to supply power, but depending on conditions such as distance and usage environment, it may be time consuming to contact, so it is more reliable. As a method, a method of forcibly short-circuiting with a pantograph connected to an overhead wire on the energization side is adopted, and a protective grounding switch is used as such a short-circuiting means.

Specifically, such a protective earthing switch includes a contact that is fixed to the other side of the insulator fixed on one side to the fixed part that is the ground side, and one side that is supported by a shaft provided on the fixed part. There has been proposed one provided with a blade whose side swings and contacts the contact (for example, see Patent Document 1). In such a protective earthing switch, the blade is normally separated from the contact, so that both sides of the insulator can be kept insulated. On the other hand, when the blade rotates and contacts the contact, the contact can be grounded through the blade. Further, in Patent Document 1, an energizing contact and an arc contact are provided as contacts, and a contact portion that contacts the blade of the energizing contact protrudes in parallel with a contact portion that contacts the blade of the energizing contact. It is provided at the tip of the lower diameter neck. And by setting it as such a contact part, when a braid | blade and a contactor contact, it is supposed that it can prevent that a big electric current flows and a braid | blade is welded to a contactor.
JP-A-8-153445

  However, even when the configuration as in Patent Document 1 is applied, when the blade contacts the contact, a large current does not change in a small range of the contact portion between the blade and the contact. The blade and the contact were not prevented from being welded. If the blade and contact are welded, the blade can no longer swing, and the operator can directly protect the grounding side and the energized side again to return to the normal state. It was necessary to go to the ground switch and remove it, and there was a problem that it took time to recover.

  The present invention has been made in view of the above-described circumstances, and even if the blade and the contact are welded, the current-carrying side and the grounding side are easily and quickly insulated regardless of the hand of the operator. Provided is a protective grounding switch that can be restored to a closed state.

In order to solve the above problems, the present invention proposes the following means.
The present invention is a protective grounding switch for grounding the other end side of the insulator that is supported at one end on the ground side and the other end is connected to the energization side to insulate each other, and contacts provided in conducting the energization side, base end portion is rotated movably supported on the ground side, it rotates from the standby position the tip portion is spaced apart from the contact to a contact position in contact with the contact A movable blade, a drive unit including an actuator connected to the base end portion and rotating the blade, and the blade is forcedly brought into contact with the contactor at the contact position and welded to each other. comprising a separating means for separating, wherein the spacing means is provided between the base end of the blade the tip, the tip relative to the proximal portion, the moving direction the of the blade Standby position side Has a rotation supporting mechanism for rotatably supporting the al the contact position, the tip of the blade is characterized in that it is set shorter than the proximal portion.

  According to this configuration, even when the blade is moved from the standby position to the contact position and the tip portion contacts and contacts the contactor, the blade tip portion and the contactor are separated by the separating means without the operator's hand. It can be forcibly separated. Thus, the blade can be returned to the standby position, and the grounding side on which the blade is supported and the energization side on which the contact is provided can be restored to the insulated state.

Further , when the blade is moved from the contact position to the standby position in a state where the blade and the contact are welded, the tip of the blade is restrained by the contact, so that it is relatively relative to the base end. Will rotate to the contact position side. For this reason, the tip of the blade tries to rotate around the welded portion fixed to the contact as the base end moves, and this causes the twisted portion to act on the welded portion. Can be removed and separated from the state welded to the contact.

Furthermore, since the tip of the blade is shorter than the base end, it is possible to increase the amount of torsional deformation at the welded portion of the tip with the contact with the movement of the base end toward the standby position. The tip of the blade can be removed and separated from the state welded to the contact by effectively twisting.

In the above protective ground switch, it is more preferable that a conduction means is provided between the base end portion and the tip end portion of the blade to make the blades move while being movable .

According to this configuration, when the blade is moved from the standby position to the contact position and brought into contact with the contact, the current flowing from the contact can flow from the distal end portion to the proximal end portion through the conduction means. The current flowing directly from the distal end portion to the proximal end portion can be minimized. For this reason, it is possible to prevent welding between the proximal end portion and the distal end portion due to the current flowing from the proximal end portion to the distal end portion, and to rotate the distal end portion with respect to the proximal end portion. There is .

In the protective ground switch, it is more preferable that the separating means has a twisting mechanism for rotating the tip end portion around an axis with respect to the base end portion of the blade .

According to this configuration, in a state where the blade and the contact are welded, if the tip end portion is rotated around the axis with respect to the base end portion of the blade by the twisting mechanism, Twist will act. Thereby, the front-end | tip part of a braid | blade can be removed and spaced apart from the state welded to the contactor .

  In the above protective ground switch, it is more preferable that the separation means has an impact generating mechanism that applies an impact toward the standby position with respect to the blade at the contact position.

  According to this configuration, in a state where the blade and the contact are welded, the impact generating mechanism gives an impact toward the standby position with respect to the blade, thereby removing the blade tip from the state welded to the contact, It can be separated to the standby position side.

Further, in the protective earthing switch, the impact generating mechanism includes a rotatable movement arm toward said blade in said contacting position proximal end is rotatably supported on the ground side, the axis of rotation of the arm It is more preferable to have a roller that is rotatable about an axis substantially parallel to the blade and that can contact the blade at the contact position.

  According to this configuration, in a state where the blade and the contact are welded, by rotating the arm toward the blade at the contact position, the roller provided on the tip side of the arm collides with the blade, thereby Can give an impact. At this time, the roller in contact with the blade rotates with respect to the arm about an axis substantially parallel to the rotation axis of the arm by a frictional force generated between the roller and the blade. For this reason, the impact energy from the roller can be efficiently transmitted to the blade without being lost due to the frictional force generated between the roller and the tip of the blade is more reliably removed from the contacted state with the contact. Can be made.

The railway vehicle according to the present invention, a protective earthing switches described above, the vehicle body traveling on the rails, is disposed on the top plate or on the underfloor of the vehicle body, from the vehicle body above or below the feed line The power supply member is configured to include a power supply member that performs power supply, and one end that is supported by the vehicle body as the grounding side and the other end that is connected to the power supply member as the power supply side.

  According to this configuration, power can be supplied from the power supply line through the power supply member in a state where the vehicle body and the power supply member are insulated from each other by the insulator. Further, by driving a protective grounding switch as necessary, the other end side of the insulator to which the power supply member on the energization side is connected is connected to the one end side to which the vehicle main body on the grounding side is connected and grounded. be able to. Then, when power feeding is started again, the blade can be separated from the contact by the separating means of the protective ground switch, so that it can be quickly recovered.

In the protective earthing switch of the present invention, since the separating means is provided, even if the blade and the contact are welded, the energization side and the earthing side are easily and quickly insulated without depending on the hand of the operator. Can be recovered.
Moreover, in the railway vehicle according to the present invention, by providing the protective ground switch, it is possible to easily and quickly recover from the grounded state to the insulated state.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the railway vehicle 1 according to the present embodiment is provided on a vehicle body 2 that can run on wheels 2 a on a rail R, and on a top plate 2 b of the vehicle body 2. A pantograph 3 that is a power supply member that feeds power from an overhead line L that is disposed along R, an insulator 4 that supports the pantograph 3 with respect to the vehicle body 2, and a top plate 2 b of the vehicle body 2. And a protective earth switch 10 provided.

  As shown in FIGS. 2 and 3, the insulator 4 includes an insulator body 5, a lower support member 6 provided at the lower end of the insulator body 5 and fixed to the top plate 2 b of the vehicle body 2, and the upper end of the insulator body 5. And an upper support member 7 that supports the pantograph 3. The upper support member 7 is made of metal and is electrically connected to the pantograph 3. The insulator main body 5 is formed of an insulating material, and thereby, the pantograph 3 that receives power from the overhead line L is set as the energizing side, and the vehicle main body 2 is set as the installation side to insulate the two.

  The protective grounding switch 10 includes a pair of fixed contacts 11 and 11 and a pair of arc contacts 12 and 12 fixed to the upper support member 7 of the insulator 4, and the top plate 2 b of the vehicle body 2. A substantially rod-like blade 13 that is rotatably supported, a drive unit 14 that rotates the blade 13, and the blade 13 is forced from a state in which the blade 13 is welded to the pair of fixed contacts 11, 11 and the pair of arc contacts 12, 12. And a separating means 15 for separating them. The pair of fixed contacts 11, 11 are separated from each other by a width that is substantially equal to or slightly smaller than the short diameter of the tip 13 b of the blade 13 described later, and are attached to the upper support member 7 in a cantilever manner and project outward. Yes.

  Moreover, the front-end | tip part 11a of a pair of fixed contacts 11 and 11 is bent so that a mutual separation distance may spread toward the front end side. Further, the pair of arc contacts 12, 12 are also separated from each other by a width substantially equal to or slightly smaller than the short diameter of the tip 13 b of the blade 13, which will be described later, and the upper support member 7 above the fixed contacts 11, 11. Are attached in a cantilevered manner and project outwardly substantially parallel to the stationary contacts 11, 11. Similarly, the tip portions 12 a of the pair of arc contacts 12, 12 are bent so that the distance between them is widened toward the tip side, and project outward from the pair of fixed contacts 11, 11. ing.

  The drive unit 14 is disposed so as to be orthogonal to a casing 16 provided on the top plate 2b, an air cylinder 17 which is an actuator provided in the casing 16, and a piston 17a connected to the air cylinder 17. And a rotating shaft 18 to which the tip of the piston 17a is connected. Although not shown, the air cylinder 17 can be driven by supplying and exhausting air by an operation unit provided in the vehicle main body 2. The rotating shaft 18 is rotatable horizontally to the side plate of the housing 16 so as to be substantially horizontal and substantially orthogonal to the direction in which the pair of fixed contacts 11, 11 and the pair of arc contacts 12, 12 are arranged. The end portion protrudes outside the casing 16.

  The blade 13 is attached to the end of the rotating shaft 18 that protrudes outside the housing 16. For this reason, the blade 13 can be rotated and moved on the top plate 2b by rotating the rotary shaft 18 by moving the piston 17a forward and backward by driving the air cylinder 17. More specifically, the blade 13 is separated from the pair of fixed contacts 11, 11 and the pair of arc contacts 12, 12 by the rotating shaft 18, and is placed on the top plate 2 b in a substantially horizontal standby state. It is possible to rotate from position A to a contact position B that is inserted between and in contact with each of the pair of fixed contacts 11 and 11 and the pair of arc contacts 12 and 12. Yes. Here, the blade 13 is formed of a conductor such as copper, and the cross section is formed in an elongated elliptical shape in the direction in which the pair of fixed contacts 11 and 11 and the pair of arc contacts 12 and 12 are disposed. It is a substantially rod-shaped member, and has a base end portion 13a fixed to the rotary shaft 18 and a tip end portion 13b attached to the base end portion 13a. Here, in the base end part 13a and the front-end | tip part 13b which comprise the braid | blade 13, it is more preferable that the front-end | tip part 13b is set shorter.

  The separating means 15 is constituted by a rotation support mechanism 20 provided between the base end portion 13a and the tip end portion 13b. The rotation support mechanism 20 is provided at the distal end of the base end portion 13a substantially in parallel with the rotation shaft 18 of the drive unit 14, and includes a shaft body 20a that rotatably supports the base end of the distal end portion 13b, and a base end portion 13a. A restricting portion 20b that protrudes from the distal end to the distal end side and restricts rotation of the distal end portion 13b to the standby position A side, and biases the distal end portion 13b toward the restricting portion 20b around the shaft body 20a with respect to the base end portion 13a. And a spring member 20c which is an urging means. For this reason, in the state where no external force acts, the distal end portion 13b is held linearly with the proximal end portion 13a by the restricting portion 20b and the spring member 20c. On the other hand, the external force is applied to the proximal end portion 13a. On the other hand, it can rotate to the contact position B side. Further, between the base end portion 13a and the tip end portion 13a of the blade 13, a conducting wire 21 which is a conduction means is connected. The conducting wire 21 is connected to the proximal end portion 13a and the distal end portion 13b in a relaxed state. For this reason, while the front-end | tip part 13b can rotate without the conducting wire 21 interfering with the base end part 13a around the shaft body 20a of the rotation support mechanism 20, the current flowing through the front-end part 13b is: The amount of current flowing through the rotation support mechanism 20 can be minimized, and the current can flow through the base end portion 13a via the lead wire 21.

  Next, the operation of this embodiment will be described. In a normal state, the blade 13 of the protective earthing switch 10 is set to the standby position A, so that the vehicle body 2 and the overhead line L are insulated from the overhead line L by the lever 4 as shown in FIG. Electricity can be supplied via the pantograph 3, whereby the vehicle main body 2 can travel on the rail R. In addition, when a problem occurs in the vehicle body 2 or peripheral equipment, it is necessary to stop itself quickly and to forcibly stop the power supply from the overhead line L so that the next railway vehicle does not enter. In this case, the driver operates the operation unit (not shown) to drive the air cylinder 17 of the drive unit 14.

As a result, as shown in FIGS. 2 and 3, the blade 13 is rotated around the rotation shaft 18 from the standby position A to the contact position B, and the tip 13 b is inserted between the pair of arc contacts 12, 12. Furthermore, it inserts between a pair of fixed contacts 11 and 11 and makes them conductive by bringing them into contact. At this time, the tip portion 13b of the blade 13 can be rotated with respect to the base end portion 13a by the shaft body 20a, but since the rotation to the standby position A side is restricted by the restricting portion 20b, a spring is also provided. Since it is urged toward the standby position A by the member 20c, it can be rotated to the contact position B integrally with the base end portion 13a without being bent. For this reason, the overhead line L is connected from the pantograph 3 to the vehicle body 2 on the ground side via the upper support member 7 of the insulator 4, the stationary contacts 11, 11 and the arc contacts 12, 12, and the blade 13. The power supply from the overhead wire L can be forcibly stopped by grounding. At this time, the pair of fixed contacts 11 and 11 and the pair of arc contacts 12 and 12 that are in contact with each other and the tip 13b of the blade 13 are partially welded. Further, when the blade 13 is in the contact position B , a current flows through the distal end portion 13 b of the blade 13, but the current that has flowed through the distal end portion 13 b is allowed to flow to the proximal end portion 13 a via the lead wire 21. This is possible, and the current flowing through the rotation support mechanism 20 can be minimized. For this reason, it is possible to prevent the rotation support mechanism 20 from being damaged or melted due to the current flowing when the blade 13 is brought into the contact position A, or being unable to rotate.

  Next, a case will be described in which the problem is solved and the normal operation is restored. In this case, as shown in FIG. 4, the driver again operates the operation unit (not shown) to drive the air cylinder 17 of the drive unit 14 and rotates the blade 13 from the contact position B toward the standby position A. . Here, as described above, the tip 13b of the blade 13 is welded and restrained by the pair of fixed contacts 11, 11 and the pair of arc contacts 12, 12, so that the spring member around the shaft body 20a. It will rotate to the contact position B side relatively with respect to the base end part 13a against the urging | biasing of 20c. For this reason, the distal end portion 13b of the blade 13 tries to rotate around the welded portion fixed to the pair of fixed contacts 11, 11 and the pair of arc contacts 12, 12 as the proximal end portion 13a moves. As a result, twisting acts on the welded portion. For this reason, the tip 13b of the blade 13 can be removed and separated from the state in which the tip 13b of the blade 13 is welded to the pair of fixed contacts 11, 11 and the pair of arc contacts 12, 12.

  As described above, in the protective earthing switch 10 of the railway vehicle 1 according to the present embodiment, the blade 13 is provided with the pair of fixed contacts 11 and 11 and the pair of arc contacts 12 by including the rotation support mechanism 20 as the separation means 15. , 12 can be restored to the state in which the pantograph 3 on the energization side and the vehicle main body 2 on the ground side are insulated from each other easily and quickly without depending on the hand of the operator. Moreover, in this embodiment, since the front-end | tip part 13b of the braid | blade 13 is set shorter than the base end part 13a, a pair of fixation of the front-end | tip part 13b accompanying the movement to the stand-by position A side of the base end part 13a is carried out. The amount of torsional deformation at the welded portion between the contacts 11 and 11 and the pair of arc contacts 12 and 12 can be increased, and the tip 13b of the blade 13 is brought into a pair of fixed contacts by causing the twist to act more effectively. It can be removed and separated from the state welded to the children 11 and 11 and the pair of arc contacts 12 and 12. Note that the length of the base end portion 13a of the blade 13 is fixed to the rotation support mechanism 20 between the base end portion 13a and the front end portion 13b when rotating from the standby position A to the contact position B. More preferably, the length is so long as no discharge occurs from the 11 side. Thereby, it can prevent reliably that the rotation support mechanism 20 is damaged by discharge generation.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. 5 and 6 show a second embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 5, the protective ground switch 30 of this embodiment includes a blade 31 rotatably attached to the rotary shaft 18 of the drive unit 14, a pair of fixed contacts 11, 11 and a pair of arcs. There is a separating means 32 forcibly separating the contacts 12 and 12 from the welded state. The blade 31 is a member having a substantially circular cross section, and has a proximal end portion 31a attached to the rotary shaft 18 and a distal end portion 31b protruding from the proximal end portion 31a to the distal end side. The separating means 32 is provided between the proximal end portion 31a and the distal end portion 31b, and is constituted by a twisting mechanism 33 that rotates the distal end portion 31b about the axis with respect to the proximal end portion 31a. The twisting mechanism 33 is formed at the distal end of the proximal end portion 31a, and the insertion end 33a into which the proximal end of the distal end portion 31b is rotatably inserted around the axis, and the distal end portion 31b around the axis is built in the proximal end portion 31a. It is comprised with the torsion actuator 33b to rotate.

  In the protective ground switch 30 of this embodiment, when the blade 31 at the contact position A is welded to the pair of fixed contacts 11 and 11 and the pair of arc contacts 12 and 12, the driver performs an operation (not shown). The torsion actuator 33b is driven by operating the portion, and the distal end portion 31b is rotated about the axis with respect to the proximal end portion 31a of the blade 31. Thereby, as shown in FIG. 6, a twist acts on the welding part fixed to the pair of fixed contacts 11, 11 and the pair of arc contacts 12, 12 of the tip 31b of the blade 31, The tip 31b of the blade 31 can be removed and separated from the welded state. Also in the present embodiment, the leading end 31b is hindered with respect to the base end 31a by connecting the conducting wire 21 as a conducting means between the base end 31a and the tip 31b of the blade 31. It is possible to prevent the twisting mechanism 33 from being damaged by allowing a current to flow from the distal end portion 31b to the proximal end portion 31a via the conducting wire 21 while allowing rotation around the axis.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 7 shows a third embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 7, the protective grounding switch 40 of this embodiment is directed to the standby position A with respect to the blade 41 rotatably attached to the rotating shaft 18 of the drive unit 14 and the blade 41 at the contact position B. And a separating means 43 comprising an impact generating mechanism 42 for applying an impact. In the present embodiment, the blade 41 is formed of a conductor such as copper as in the first embodiment, and has a substantially elliptical cross-sectional shape. Unlike the first embodiment, the blade 41 is integrated from the proximal end to the distal end. This is a substantially rod-shaped member.

Further, the impact generating mechanism 42 constituting the separating means 43 includes an arm rotation shaft 44 rotatably supported by the housing 16 of the drive unit 14 so as to be substantially parallel to the rotation shaft 18 of the drive unit 14; has an arm 45 which proximal end attached to the arm rotation shaft 44, the roller 46 attached to the tip of the arm 45, an arm actuator 47 which is housed in the housing 16 by rotating the arm rotation shaft 44. The arm actuator 47 has the same configuration as that of the air cylinder 17 of the drive unit 14 and can rotate the arm 45 by rotating the arm rotation shaft 44 by moving the piston back and forth. More specifically, the arm 45 is separated from the blade 41 at the contact position A by the arm rotation shaft 44, and is moved from the arm standby position C disposed substantially horizontally near the top plate 2b to the contact position A. The blade 46 can rotate and move to a collision position D where the roller 46 can be brought into contact with the blade 41. The roller 46 is a substantially cylindrical member, and is provided at the tip of the arm 45 so as to be able to rotate in the plane of rotation of the arm 45 around an axis substantially parallel to the arm rotation shaft 44. The portion is provided so as to protrude toward the blade 41 side.

  In the protective ground switch 40 of this embodiment, when the blade 41 at the contact position A is welded to the pair of fixed contacts 11 and 11 and the pair of arc contacts 12 and 12, the driver performs an operation (not shown). The arm actuator 47 is operated to drive the arm 45, the arm 45 is rotated from the arm standby position C toward the collision position D, and the roller 46 at the tip of the arm 45 is caused to collide with the blade 41. As a result, an impact is applied to the blade 41 toward the standby position A, and the blade 41 is removed from the state in which the blade 41 is welded to the pair of fixed contacts 11 and 11 and the pair of arc contacts 12 and 12 with this impact. , It can be separated to the standby position B side. At this time, the roller 46 in contact with the blade 41 rotates with respect to the arm 45 in the same plane by a frictional force generated between the roller 41 and the blade 41. For this reason, the impact energy generated by the roller 46 can be efficiently transmitted to the blade 41 without being lost by the frictional force generated between the roller 41 and the tip of the blade 41 is more reliably removed from the welded state. Can be separated.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  In each of the embodiments described above, the blade is rotationally moved. However, the blade is not limited to this, and is configured to be movable from a standby position separated from the contact to a contact position where the contact is in contact with the contact. Any moving mechanism may be used as long as it is. Moreover, in the said embodiment, although the rotation support mechanism 20, the twist mechanism 33, and the impact generation mechanism 42 were each mentioned as the separation means, it is good also as what combines these. Moreover, in the said embodiment, although the protective earthing switch shall be provided on the top plate of a rail vehicle, it is not restricted to this. For example, when the power supply line is disposed under the floor of the railway vehicle and a power supply member that supplies power from the power supply line is provided under the floor, the protective ground switch may be provided under the floor.

1 is a side view showing an outline of a railway vehicle according to a first embodiment of the present invention. It is the top view which fractured | ruptured a part which shows the detail of the protective earthing switch of the 1st Embodiment of this invention. It is the side view which fractured | ruptured a part which shows the detail of the protective earthing switch of the 1st Embodiment of this invention. It is explanatory drawing at the time of making it isolate | separate from a contactor by a separation means in the protective earthing switch of the 1st Embodiment of this invention. It is a side view which shows the detail of the protective earthing switch of the 2nd Embodiment of this invention. It is explanatory drawing at the time of making it isolate | separate from a contactor by a separation means in the protective earthing switch of the 2nd Embodiment of this invention. It is a side view which shows the detail of the protective earthing switch of the 3rd Embodiment of this invention.

Explanation of symbols

1 Railcar 2 Vehicle body 3 Pantograph (feeding member)
4 Insulator 10, 30, 40 Protective earth switch 11 Fixed contact (contact)
12 Arc contact (contact)
13, 31, 41 Blade 13a, 31a Base end portion 13b, 31b Tip end portion 15, 32, 43 Separation means 20 Rotation support mechanism 21 Conductor (conduction means)
33 twisting mechanism 42 impact generating mechanism 45 arm 46 roller A standby position B contact position L overhead line (feeding line)
R rail

Claims (6)

A protective grounding switch for grounding the other end side of the insulator that has one end supported on the ground side and the other end connected to the energization side to insulate each other,
A contact provided at the other end of the insulator and connected to the energization side;
Base end portion is rotated movably supported on the ground side, and rotatable movement to the contact position blade in contact with the contacts from the standby position the leading end portion is separated from the contactor,
A drive unit that is connected to the base end part and includes an actuator that rotationally moves the blade;
Separating means for forcibly separating the blade from a state in which the blade is in contact with the contact at the contact position and welded to each other;
The spacing means is
Provided between the tip and the base end of the blade, the tip portion relative to the proximal portion, for rotatably supporting the moving direction the standby position side of the blade to the contact position side A rotation support mechanism;
The protective grounding switch according to claim 1, wherein the tip end portion of the blade is set shorter than the base end portion. The protective earth switch according to claim 1,
A protective grounding switch is provided between the base end portion and the tip end portion of the blade, wherein a conducting means is provided that allows the blades to move while being movable. In the protective earthing switch according to claim 1 or 2,
2. The protective grounding switch according to claim 1, wherein the separating means has a twisting mechanism for rotating the tip end portion around an axis with respect to the base end portion of the blade. In the protective earthing switch according to any one of claims 1 to 3,
The protective grounding switch according to claim 1, wherein the separating means includes an impact generating mechanism that applies an impact toward the standby position with respect to the blade at the contact position. The protective earthing switch according to claim 4,
The impact generating mechanism, an arm rotatably moved toward the blade in said contacting position proximal end is rotatably supported on the ground side, rotatable substantially about an axis parallel to the rotation axis of the arm A protective grounding switch, comprising: a roller provided on the blade and capable of contacting the blade at the contact position. A protective grounding switch according to any one of claims 1 to 5;
A vehicle body traveling on the rail;
Disposed on or under the floor ceiling plate of the vehicle body, and a power supply member for supplying power from the vehicle body above or below the feed line,
A railway vehicle comprising: one end supported by the vehicle body as the grounding side and the other end connected to the power supply member as the energization side.

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