JPH09240330A - Lifting type third rail device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a depth of a pit for storing a driving source for a third rail as much as possible and enable a positive prevention of accidental dropping into the pit to be attained. SOLUTION: A lifting device 1 for a lifting type third rail device is comprised of oscillating links 14, 15 with one end being rotatably connected to a bottom surface side of a pit 9 or the lower surface of a third rail 10 and the other end being rotatably connected to the lower surface of the third rail 10 or the bottom surface side of the pit 9 and in a direction crossing with a lifting direction in advancing or retracting manner, and a driving cylinder 13 for oscillating the oscillating links 14, 15 in the vertical direction. A movable lid C1 covering the upper surface of the pit 9 is arranged on a vehicle base floor F. A lid opening or closing cylinder 42 for driving the movable lid C1 is arranged within the pit 9. A switch means 36 for use in sensing the fact that the third rail 10 is placed at a retracted position and a changing-over means for driving the lid opening or closing cylinder 42 in response to a sensing signal of the switch means and causing the movable lid C1 to occupy its closed position are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating type third rail device which is provided at a vehicle depot such as a garage or a repair shop so as to be able to move up and down and supplies electric power to the electric vehicle from its bottom.

[0002]

2. Description of the Related Art In an electric vehicle such as a subway, instead of supplying power from an upper portion of the vehicle by using an overhead wire and a pantograph, a power feeding third is provided slightly above the side portions of the two rails and in parallel therewith. There is a rail provided so that a current collector arranged at the bottom of the vehicle is brought into sliding contact with the third rail. This current collector is normally movable between a position sliding on the third rail outside the vehicle limit and a position retracting within the vehicle limit, and is stored within the vehicle limit when not in use. Has become. On the other hand, at vehicle depots such as garages and factories for repair and maintenance, in order to ensure safety,
In order to facilitate the repair and inspection of the bottom of the vehicle, the third rail is configured to be movable up and down, and when the vehicle is stopped,
The third rail is disengaged from the current collector of the vehicle and lowered to substantially the same height as the floor surface of the vehicle depot.

That is, as shown in FIGS. 9 and 10,
In the conventional lifting type third rail device, two vertically deep pits 1 are formed on the floor surface F of the vehicle base, and the lifting cylinders 2 are erected in the pits 1 and the upper ends of the rods 3 of the lifting cylinder 2 are formed. Is connected to the bottom side of the third rail 4, and a relatively shallow pit 5 for accommodating the third rail 4 is formed along the longitudinal direction of the third rail 4 between the two pits 1 and before and after them. ing.

Further, a lid 6 for covering the pit 5 from both left and right sides.
Are attached to both upper ends of the pit 5 by hinges 7 so as to be openable and closable. The portion of the lid 6 near the hinge 7 is formed by the iron plate 6a, and the portion near the third rail 4 is formed by the rubber plate 6b. When the third rail 4 descends, the lid 6 is manually closed to cover the pit 5. ing.

[0005]

However, in the above configuration, since the third rail 4 is directly moved up and down by the vertically moving lifting cylinder 2, the depth of the pit 1 for housing the lifting cylinder 2 is as follows. For example, although it is considerably large at about 1.2 to 1.5 m, a worker is not provided on the pit 1 because the lid 6 is not provided above the pit 1.
There was a risk of falling inside and being injured.

An openable and closable lid 6 is also provided above the pit 1.
However, even in that case, the worker accidentally falls into the pit 1 when opening / closing the lid 6 or when the lid 6 is opened while the third rail 4 is being used. There is a fear. Furthermore, since the lid body 6 is divided into two parts on the left and right and the portion near the third rail 4 is formed of the rubber plate 6b, it does not have sufficient strength for fall prevention.
If the worker accidentally puts his / her foot on the rubber plate 6b of the lid 6 when crossing over the pit 5, there is a risk that the foot may be caught in the pit 5. Further, in the subway, since the vehicle depot is also provided underground, when the pit 1 becomes deep, groundwater easily spouts out, and there is the complexity of having to take drainage measures.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above problems by reducing the depth of a pit accommodating a drive source of a lifting type third rail as much as possible, and ensuring a fall accident into the pit. The purpose is to be able to prevent. Therefore, the lifting type third rail device according to claim 1 is provided in the vehicle depot, and the use position of the third rail for supplying power to the vehicle and the retracted position in the pit formed on the floor of the vehicle depot. An elevating and lowering device to be moved between the elevating and lowering device is housed in the pit, and the elevating and lowering device has one end rotatably connected to the pit bottom side or the third rail lower surface side and the other end. Is provided with a swing link that is rotatably connected to the lower surface side of the third rail or the bottom side of the pit and is movable back and forth in a direction perpendicular to the vertical direction, and a drive cylinder that swings the swing link in the vertical direction. A movable lid that covers the pit upper surface is provided on the floor surface of the vehicle base, and a lid opening / closing cylinder that drives the movable lid is provided in the pit, and the third rail is in the retracted position. And switch means for detecting,
Switching means for driving the lid opening / closing cylinder based on the detection signal of the switch means to set the movable lid to the closed position is provided.

According to the above construction, when the third rail is in the retracted position in the pit, the rod of the drive cylinder is retracted into the drive cylinder, and in this state, the swing link has an inclination angle with respect to the horizontal direction. It is the smallest.
The movable lid covers the upper surface of the pit to cover the upper side of the third rail. From this state, when the third rail is raised to the use position where it contacts the current collector of the vehicle, the drive cylinder extends the rod. As a result, the swing link swings upward while gradually increasing the tilt angle with respect to the horizontal direction, and when the tilt angle of the swing link becomes maximum, the third rail contacts the current collector and reaches the use position. .

On the other hand, when the third rail is moved from the use position to the retracted position, when the drive cylinder contracts the rod and gradually retracts into the drive cylinder, the swing link swings downward to move the third rail. The rail gradually descends. When the third rail finishes descending and reaches the retracted position in the pit, the switch means detects it, and the switching means drives the lid opening / closing cylinder to move the movable lid to the closed position.

In the present invention, the swing cylinder is swung in the vertical direction by the drive cylinder, and the third rail is moved up and down by this swing link. Therefore, when the third rail is directly moved up and down by the drive cylinder as in the conventional case. Compared to
Even if the vertical scroll of the rod of the drive cylinder is reduced, the predetermined amount of elevation of the third rail can be secured, and as a result, the depth of the pit in which the elevating device such as the drive cylinder is housed is made shallower than before. be able to.

[0012] According to a second aspect of the present invention, in the configuration of the first aspect, the lifting device is provided with an auxiliary cylinder that generates a driving force when the third rail is lifted from the retracted position. It is what

In the present invention, the drive cylinder is arranged upright, for example, instead of standing upright as in the conventional case, and the base end portion of the drive cylinder is rotatably connected to the pit bottom side. The drive cylinder may be configured to swing upward as the rod of the drive cylinder extends, that is, as the swing link swings upward. With such a configuration, when the third rail is in the retracted position, the inclination angle of the drive cylinder with respect to the horizontal direction is relatively small, so the rod of the drive cylinder must be extended in order to raise the third rail from the retracted position to the use position. At the start, since the vertical component of the driving force of the drive cylinder is small, it may be difficult for the drive cylinder alone to smoothly start the upward swing of the swing link.

Therefore, in claim 2, when the ascending from the retracted position is started, the auxiliary cylinder presses the swing link upward so that the upward swing of the swing link is smoothly started. . When the swing link swings upward to some extent, the drive cylinder also swings upward accordingly, so that the vertical component of the drive force of the drive cylinder becomes sufficiently large. It is possible to swing the moving link upward. Therefore, the auxiliary cylinder does not need to operate in all the steps of raising the third rail, and only needs to drive the third rail upward in some steps immediately after the start of raising the third rail. Therefore, even if the auxiliary cylinder is, for example, of a type in which the auxiliary rail is vertically arranged and the rod directly presses the third rail upward, the vertical width thereof can be configured to be sufficiently small, so that the auxiliary cylinder can be relatively small. It is possible to store it in the shallow pit of the present invention.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, at a depot such as a subway or other electric vehicle garage or repair or maintenance factory, these rails are located beside two rails (not shown) for traveling the vehicle. A pit 9 is formed with a constant depth D parallel to the rail. The depth D of the pit 9 is shallower than in the past and is set to, for example, about 600 mm. The elevating type third rail device is arranged in parallel with the above-mentioned two rails, and the front and rear ends of the third rail 10 are slightly curved downward.
And two lifting devices 11 before and after moving the third rail 10 up and down between a use position where it contacts a current collector (not shown) provided on one side of the bottom of the vehicle and a retracted position in the pit 9. Is equipped with. The length of the third rail 10 is not particularly limited, but is, for example, about 13 m,
The length of the pit 9 is set to be slightly longer than that of the third rail 10.

At the top of each lifting device 11, a pit 9
Is covered by the two movable lids C1 that are substantially flush with the floor surface F of the vehicle base at the lid closed position.

The lifting device 11 will be described below. As is apparent from FIG. 1, since the two lifting devices 11 are symmetrically arranged in the front-rear direction, here, the lifting device 1 on the front side is used.
Only 1 will be described. As shown in FIGS. 3 and 4, the lifting device 11 includes a base 12 fixed on the bottom surface of the pit 9.
And a drive cylinder 13 which is arranged along the longitudinal direction of the pit 9 and whose rod 13a is expanded and contracted by air pressure.
And two first swing links 14 that are inclined on both the left and right sides of the drive cylinder 13 so that the front is higher, and the drive cylinder 13 that intersects the first swing links 14.
Two second rocking links 15 are provided on both the left and right sides of the second tilting link 15 so as to be inclined rearwardly.

The base end (rear end) of the drive cylinder 13 is
The support shaft 16 is fixed by the bracket 16 fixed on the base 12.
It is rotatably supported in the vertical direction via a. The third rail 10 is formed in a substantially horizontal H-shaped cross section, is placed on an insulating plate 17 made of a non-conductive material such as fiber reinforced resin, and is pressed against the upper surface of the insulating plate 17 by holding plates 18 arranged on both left and right sides. , Fixed. These pressing plates 18 are fixed to the insulating plate 17 by bolts 20 and nuts 21. As the third rail 10, an H-shaped steel having an appropriate size may be used other than the illustrated one.

At the bottom of the insulating plate 17, there is one insulating plate 22.
The metal support plate 23 is fixed by the bolts 24 via. Brackets 25 are fixed to both left and right ends of the lower surface of the front end of the support plate 23. The front ends of the two first swing links 14 are rotatably supported by brackets 25 via support shafts 25a. On the other hand, brackets 26 are fixed to the left and right ends of the base 12 corresponding to the brackets 25, respectively.
The front end of the swing link 15 is rotatably supported by a bracket 26 via a support shaft 26a.

Two rails 27 each having a substantially L-shaped cross section and extending in the front-rear direction are attached in parallel to each other on both left and right ends on the lower surface side from the vicinity of the central portion in the longitudinal direction of the support plate 23 to the rear end portion. A bent portion 27a that bends outward is provided at the lower end of the rail 27, and a long sandwiching member 28 facing the bent portion 27a is parallel to the bent portion 27a on the outer side of the upper end of the rail 27. It is attached so as to extend in the front-back direction. A roller 30 is rotatably attached to the rear end portion of the second swing link 15, and the roller 3
0 is rotatably sandwiched between the bent portion 27a of the rail 27 and the sandwiching member 28, and is movable in the front-rear direction along the rail 27.

Rails 31 each having a substantially L-shaped cross section having a bent portion 31a whose upper end bends outward are attached to both left and right end portions corresponding to the rail 27 on the base 12, and a lower end portion of the rail 31. A sandwiching member 32 is attached to the outer side of. The roller 3 is provided at the rear end of the first swing link 14.
3 is rotatably attached, and the roller 33 is rotatably sandwiched between the bent portion 31a and the sandwiching member 32.
The rail 31 is movable in the front-rear direction.

The longitudinal central portions of the two left and right first swing links 14 and the second swing links 15 are rotatably connected to each other by a central shaft 34 extending in the width direction of the base 12. ing. The tip of the rod 13a of the drive cylinder 13 is rotatably connected to the center of the central shaft 34 in the width direction. Then, when the rod 13a is extended by the drive cylinder 13 from the retracted state of the third rail 10 in FIG. 3, the rollers 30 and 33 move forward along the rails 27 and 31, respectively, so that the first and second swinging motions occur. The links 14 and 15 swing upward, and accordingly, the drive cylinder 13 also swings upward with its rear end as a fulcrum, whereby the third rail 10 gradually rises, while the drive cylinder 13 moves the rod 13a backward. And let
The third rail 10 is configured to descend due to the reverse movement of each part.

In the vicinity of the front end of the rail 31 on one side, a use position where the third rail 10 contacts the current collector of the vehicle,
In other words, when the roller 33 reaches the elevated position, the roller 33
An ascending completion limit switch 35 is provided which detects that the ascending of the third rail 10 is completed by the contact of the roller 33 when the innermost part of the third rail 10 is moved to the frontmost position. Further, in the vicinity of the rear end of the rail 31, when the third rail 10 reaches the retracted position in the pit 9, that is, the lowered position, and the roller 33 moves to the rearmost position in the rail 31, the roller 33 is A descent completion limit switch 36 (switch means) for detecting that the descent of the third rail 10 is completed by making contact is provided.
In the following, various limit switches may be abbreviated as LS.

An auxiliary cylinder 37 is erected on the base 12 behind the drive cylinder 13, and the auxiliary cylinder 37 vertically drives the rod 37a thereof by air pressure. The pressing plate 10a is attached to the third rail 10 so as to correspond to the rod 37a.
An upward biasing force is applied to the third rail 10 from 7a via the pressing plate 10a. Rod 37
The ascending / descending stroke of a is sufficiently smaller than the ascending / descending amount of the third rail 10, that is, the amount of vertical movement between the use position and the retracted position (for example, about 800 to 900 mm).
For example, it is set to about 200 mm.

The drive cylinder 13 is the third rail 1
When 0 is in the retracted position, since the inclination angle with respect to the horizontal direction is small, when the rod 13a of the drive cylinder 13 starts to expand when the third rail 10 starts to rise, the drive force of the drive cylinder 13 in the vertical direction is divided. Since the force is small, it is difficult to smoothly start the rise of the third rail 10 only by the drive cylinder 13. Therefore, when the third rail 10 starts to move up, the auxiliary cylinder 37 is driven together with the drive cylinder 13 so that the third rail 10 can start to move up smoothly.

The lifting stroke of the auxiliary cylinder 37 is about 200 mm as described above, and the third rail 1
Although it can cover only about 1/4 of the first step in the ascending step of 0, when the third rail 10 is elevated by about 200 mm, the inclination angle of the drive cylinder 13 becomes considerably large, so the drive cylinder 13 The vertical component of the driving force is sufficiently large, and thereafter, the third rail 10 can be easily raised to the above-mentioned use position only by the driving cylinder 13.

Three lid support plates 38 are provided at the front end, the longitudinal middle part and the rear end at one side end of the base 12.
And a long lid support shaft 40 extending in the front-rear direction in parallel with the third rail 10 is rotatably supported by the respective lid support plates 38. As shown in FIG. 5, the lid opening / closing arm 41 is fixed to the lid supporting shaft 40 at its base end in correspondence with the lid supporting plates 38 at the front end portion and the rear end portion, and the lid opening / closing arm 41 is provided at the tip end portion of the lid opening / closing arm 41. The movable lid C1 is fixed.

Also, the lid support plate 3 at the front end and the rear end.
Two pneumatic lid opening / closing cylinders 42 are arranged adjacent to the inner side of 8. The lower end of each lid opening / closing cylinder 42 is rotatably supported by a bracket 43 fixed on the base 12, and the upper end of the rod 42a of the lid opening / closing cylinder 42 is located near the tip of the lid opening / closing arm 41. It is rotatably connected.

When the lid opening / closing cylinder 42 extends the rod 42a from the lid closed position indicated by the solid line in FIG. 5, the lid opening / closing cylinder 42 swings toward the lid support plate 38 to move the movable lid C.
1 is rotated upward to a lid open position indicated by an imaginary line, and at this lid open position, one side end portion of the movable lid C1 has a lid supporting plate 3
It is adapted to come into contact with the lid opening position stopper 44 provided on the upper part of the table 8. On the other hand, a lid closing position stopper 45 whose upper end portion is bent horizontally inward is erected on the other side end portion of the base 12, and the movable lid C1 is placed on the lid closing position stopper 45 at the lid closing position. It comes to abut.

Next, referring to FIG. 6, the drive cylinder 13,
An air circuit that supplies air pressure to the auxiliary cylinder 37 and the lid opening / closing cylinder 42 will be described. Compressed air is supplied to a receiver tank 47 (capacity is, for example, about 1000 liters) from a compressor (not shown) whose output air pressure is preferably 6 kgf / cm ² or more, and the compressed air is passed through a check valve 48. Then, it is sent to and stored in the air reservoir 46 (see FIG. 1) arranged in the pit 9. The compressed air in the air reservoir 46 is sent to the decompression setting valve 51 via the shutoff cock 50, and here, for example, 5 kgf / cm ²
After the pressure is reduced to a certain degree, it is supplied to the respective inflow ports IP of the lifting solenoid valve 52 and the lid opening / closing solenoid valve 53.

Each first supply or return port SP1 of the lifting solenoid valve 52 is connected to a drive cylinder of the two lifting devices 11 via a pipe P1 having a speed adjusting valve 54 consisting of a check valve 54a and a variable throttle 54b. 13 and auxiliary cylinder 37
On the other hand, the second supply or return port SP2 is connected to each of the base end sides of the drive cylinder 13 and the auxiliary cylinder 37 of the lifting device 11 via a pipe P2 having a similar speed adjusting valve 54. Connected to the side. Further, the two exhaust ports DP of the lifting solenoid valve 52 are open to the atmosphere via the silencer 55.

When the third rail 10 is retracted into the pit 9, the rods 13a and 37a of the drive cylinder 13 and the auxiliary cylinder 37 are in the contracted state shown in FIG. 6, and the lift solenoid valve 52 is in the neutral position shown in the figure. At position I.
When raising the third rail 10, the lifting solenoid valve 5
When 2 is moved to the left side of FIG. 6 and switched to the raised position II, compressed air is supplied from the first supply or return port SP1 to the base end sides of the drive cylinder 13 and the auxiliary cylinder 37 via the pipe P1. On the other hand, air is discharged from the respective tip end sides of the drive cylinder 13 and the auxiliary cylinder 37 via the pipe P2, and the atmosphere is passed through the second supply / return port SP2 of the lifting solenoid valve 52, the discharge port DP, and the silencer 55. The rods 13a and 37a are extended by being discharged to the.

On the other hand, when lowering the third rail 10, if the lifting solenoid valve 52 is moved to the right side in FIG. 6 and switched to the lowering position III, contrary to the above, the lifting solenoid valve 5 is moved.
Compressed air is supplied from the second supply / return port SP2 of No. 2 to each tip end side of the drive cylinder 13 and the auxiliary cylinder 37 through the pipe P2, and from each base end side of the drive cylinder 13 and the auxiliary cylinder 37. By discharging the air through the pipe P1, the rods 13a and 37a are contracted. The connection relationship between the lid opening / closing solenoid valve 53 and the lid opening / closing cylinder 42 of the two lifting devices 11 is similar to the above, and by switching from the neutral position I in the figure to the lid opening position II, the lid opening / closing cylinder 42 is opened. While the rod 42a of 42 extends, by switching to the lid closed position III,
The rod 42a is adapted to contract.

The ascending completion limit switch 35 and the descending completion limit switch 3 are provided in each drive cylinder 13.
6 (schematically shown in FIG. 6) is provided, and in each lid opening / closing cylinder 42, a fully closed detection limit switch 56 that detects that the movable lid C1 is at the fully closed position, and the movable lid C1 is at the fully open position. And a full-open detection limit switch 57 for detecting that

The procedure for raising the third rail 10 from the retracted position in the pit 9 to the use position will be described below with reference to the flowchart of FIG. After the power is turned on, the control device (not shown) determines whether or not an instruction to raise the third rail 10 has been given by a switch or the like on an operation panel (not shown) (S1). If the instruction to raise the third rail 10 has not been given, the same determination is repeated.

If it is instructed to raise the third rail 10, the controller continues to operate a buzzer (not shown) for a predetermined time.
For example, the third rail 1 is made to ring for about 5 seconds (S2).
The third rail 1
Evacuate the workers around 0. After the buzzer sounds, the control device energizes the lid opening / closing solenoid valve 53 to switch to the lid opening position II side (S3), thereby starting the rotation of the movable lid C1 in the opening direction (S4). ).

Subsequently, the control device determines whether or not the full-open detection LS57 is turned on (S5). If not, the same determination is repeated. When the full-open detection LS57 is turned on and the movable lid C1 is in the fully open state, the control device subsequently excites the elevation solenoid valve 52 to switch to the elevated position I (S6), so that the third rail 10 is moved. The ascent starts (S7). As described above, the drive cylinder 13 and the auxiliary cylinder 37 are driven in the initial stage of the ascending. However, when the third rail 10 is elevated by about 200 mm, the rod 37a of the auxiliary cylinder 37 is
As shown by the phantom line in FIG. 3, the extension is completed after reaching the upper end position, and thereafter, the third rail 10 is raised only by the driving force of the driving cylinder 13.

After that, the control device determines whether or not the rising completion LS 35 is on (S8).
The same judgment is repeated. The climb complete LS35 is turned on,
As indicated by the phantom line in FIG. 1, if the rise of the third rail 10 is completed, the control device lights up a not-shown rise completion indicator lamp to display that the third rail 10 is in the use position (S9). ).

Subsequently, the control device is the third rail 10
It is judged whether or not the energization of DC600V to the device is instructed by the switch of the operation panel or the like (S10), and if not instructed, the same judgment is repeated. If the power supply of DC600V is instructed, the control device is the third rail 1
By energizing DC600V to 0 (S11) and turning on an energization indicator lamp (not shown), it is displayed that the third rail 10 is energized (S12). in this way,
In the present embodiment, only after completion of the rise of the third rail 10 and when the energization is instructed, the third rail 10 is
When the third rail 10 is not in the use position, the control device is configured not to energize when the third rail 10 is not in the use position. So, for example, the third rail 10
There is no possibility that an electric shock will occur due to the energization of the third rail 10 during the ascent.

Next, the procedure for lowering the third rail 10 from the use position to the retracted position will be described with reference to the flowchart of FIG. After the power is turned on, the control device turns off the power of DC600V by the switch of the operation panel.
It is determined whether a command has been issued (S1), and if this command has not been issued, the same determination is repeated. Power off
If a command has been issued, the control device is
After turning off the power supply to the switch (S2), the power supply indicator lamp is turned off (S3).

Subsequently, the control device determines whether or not a command for lowering the third rail 10 has been issued by a switch or the like on the operation panel (S4). If the command has not been issued, the same determination is repeated. . If the lowering command of the third rail 10 is issued, the control device turns on the buzzer for a predetermined time,
For example, a beeping sound is emitted for about 5 seconds to notify that the third rail 10 is starting to descend, and the workers around the third rail 10 are evacuated (S5).

After the buzzer has finished sounding, the control device
The lowering of the third rail 10 is started (S7) by exciting the lifting solenoid valve 52 and switching it to the lowering position III side (S6). As described above, in the present invention, on condition that the power supply to the third rail 10 is turned off,
Since the lowering of the third rail 10 is allowed, for example, an electric shock accident does not occur accidentally during the lowering of the third rail 10. After the descent of the third rail 10 is started, the control device determines whether or not the descent completion LS 36 is on (S8), and if not, the same determination is repeated.

If the lowering completion LS36 is turned on and the lowering of the third rail 10 is completed, the control device excites the lid opening / closing solenoid valve 53 to switch to the lid closing position III (S9). The rotation of the movable lid C1 in the closing direction is started (S10). Here, the control device functions as a switching unit in the claims, and starts the closing operation of the movable lid C1 on condition that the lowering of the third rail 10 is completed.

Subsequently, the control device causes the full-close detection LS5.
6 is turned on to determine whether or not the movable lid C1 has reached the fully closed position (S11), and if it has not reached the fully closed position, the same determination is repeated. If the movable lid C1 is fully closed, then the control device lights up a descent completion indicator lamp (not shown) to indicate that the descent of the third rail 10 is completed (S12).

In the above structure, the air reservoir 4 is provided in the pit 9.
6 is provided, the third rail 10 can be moved up and down at least once by the compressed air stored in the air reservoir 46 even when the supply of compressed air from the receiver tank 47 is stopped due to a failure or the like. You can

In the above construction, the pit 9 is covered with the two movable lids C1. However, it may be covered with about four movable lids C1. In that case,
It is possible to provide as many lid opening / closing cylinders 42 as the number of movable lids C1. Further, instead of integrally forming the third rail 10, the third rail 10 may be divided into a plurality of divided bodies in the longitudinal direction, and in that case, the lifting device 11 can be provided for each divided body. Further, although the movable lid C1 is of a rotary type, it may be of a slide type which is opened and closed by sliding in the lateral direction.

Further, in the above construction, since the pit 9 is made shallow, the inclination angle of the drive cylinder 13 at the retracted position of the third rail 10 is made sufficiently small so that the drive cylinder 13 is oriented in a substantially horizontal direction at the retracted position. However, if the inclination angle of the drive cylinder 13 at the retracted position is set to be slightly larger, the third rail 10 can be moved up and down only by the drive cylinder 13 without providing the auxiliary cylinder 37. In that case, the depth of the pit 9 is somewhat larger than that of FIG. 1, but can be made considerably smaller than that of the conventional one.

[0047]

As described above, the lifting type third rail device of the present invention is provided in the vehicle base, and the third rail for supplying power to the vehicle is formed at the use position and the floor surface of the vehicle base. An elevating type third rail device in which an elevating device for moving to and from a retracted position in the pit is housed in the pit, and the elevating device is rotatable at one end to the pit bottom surface side or the third rail lower surface side. And a swing link whose other end is swingably connected to the lower surface of the third rail or to the bottom surface of the pit and movable back and forth in a direction orthogonal to the ascending / descending direction, and a drive for swinging the swing link in the vertical direction. A movable lid for covering the pit upper surface on the floor surface of the vehicle base, and a lid opening / closing cylinder for driving the movable lid in the pit, so that the third rail is retracted. The switch means for detecting that the movable lid is opened and the switch means for driving the lid opening / closing cylinder based on the detection signal from the switch means to bring the movable lid to the closed position are provided. As compared with the case where the third rail is moved up and down directly with, the predetermined vertical movement amount of the third rail can be secured even if the vertical scroll of the rod of the drive cylinder is made small. The depth of the pit to be accommodated can be made shallower than before.

As a result, even when the elevating type third rail device is installed underground, the depth of the pit is small, so that the amount of groundwater flowing out is reduced and the need for drainage measures is reduced. Further, since the raising and lowering of the third rail and the opening and closing of the movable lid are performed in conjunction with each other, the movable lid is always closed when the third rail is retracted into the pit by the action of the switch means and the switching means. It becomes difficult for an accident to fall into the pit. Even if the operator accidentally falls into the pit when the movable lid is not properly closed or the third rail is in the use position and the movable lid is open, the pit is shallower than before, so there is less risk of injury. Become.

In the above structure, if the lifting device is provided with an auxiliary cylinder that generates a driving force when the third rail is lifted from the retracted position, for example, the driving cylinder is arranged in an inclined manner and the driving cylinder is provided. Since the base end of the drive cylinder is rotatably connected to the bottom side of the pit, the rod of the drive cylinder extends when the third rail rises and the drive cylinder moves upward as the swing link swings upward. When the third rail is in the retracted position, the tilt angle of the drive cylinder is relatively small when configured to oscillate. Since the directional component is small, even if it is difficult for the drive cylinder alone to smoothly start the upward swing of the swing link, the rise of the third rail is not opened. By biasing the swing link upwards by at auxiliary cylinder, it is possible to start the upward swinging of the swing link smoothly.

[Brief description of drawings]

FIG. 1 is a side view showing a lifting type third rail device of the present invention.

FIG. 2 is a plan view showing the lifting type third rail device.

FIG. 3 is a side view showing an elevating device of the elevating third rail device.

4 is a cross-sectional explanatory view taken along the line AA of FIG.

5 is a cross-sectional explanatory view taken along the line BB of FIG.

FIG. 6 is a circuit diagram showing an air circuit that supplies compressed air to the lifting device.

FIG. 7 is a flowchart showing a procedure for raising a third rail of the lifting type third rail device.

FIG. 8 is a flowchart showing a procedure for lowering the third rail of the lifting-type third rail device.

FIG. 9 is a schematic side view showing a conventional lifting type third rail device.

FIG. 10 is a schematic plan view showing a conventional lifting type third rail device.

[Explanation of symbols]

 9 Pit 10 Third Rail 13 Drive Cylinder 14 1st Swing Link 15 2nd Swing Link 36 Descent Completion Limit Switch (Switch Means) 37 Auxiliary Cylinder 42 Lid Open / Close Cylinder C1 Movable Lid

Claims (2)

[Claims] 1. An elevating device for moving a third rail, which is provided in a vehicle depot, for supplying power to a vehicle between a use position and a retracted position in a pit formed on a floor of the depot. An elevating third rail device housed in the pit, wherein the elevating device has one end rotatably connected to a pit bottom surface side or a third rail lower surface side, and the other end is a third rail lower surface side or a pit bottom surface side. And a drive cylinder that swings the swing link in the vertical direction. The swing link is connected to the vehicle base floor surface so that the swing link is swingable in the vertical direction. A movable lid that covers the upper surface of the pit is provided, a lid opening / closing cylinder that drives the movable lid is provided in the pit, and switch means for detecting that the third rail is in the retracted position and the switch means are provided. And a switching means for driving the lid opening / closing cylinder based on the detection signal of the H means to move the movable lid to the closed position. 2. The elevating-type third rail device according to claim 1, wherein the elevating device is provided with an auxiliary cylinder that generates a driving force when the third rail rises from the retracted position.