JP6230408B2 - pantograph - Google Patents

Description

  The present invention relates to a pantograph of a single arm type mounted on a railway vehicle.

  A pantograph is mounted on a railway vehicle traveling in the electrified section. The pantograph collects electricity by bringing the current collector boat into contact with the overhead train line (overhead line). Conventionally, a single arm type pantograph is known (see Non-Patent Document 1). As shown in FIG. 12, the single arm type pantograph has a link mechanism for supporting the current collecting boat 2 so as to be displaceable in the vertical direction. In this link mechanism, a plurality of links form a plane chain by rotating pairs. The links are the upper frame 3, the lower frame 4, the balance rod 5, the balance rod 30, the boat support 21, and the like. The upper frame 3 and the lower frame 4 support the current collector boat 2. When the crossing angle θ between the upper frame 3 and the lower frame 4 changes, the current collecting boat 2 is displaced up and down. The balancing rod 5 is provided on the underframe 6 along with the lower frame 4, and the trajectory in which the current collecting boat 2 is displaced up and down is adjusted by setting the length of the balancing rod 5. The attitude of the current collecting boat 2 regardless of the vertical displacement of the current collecting boat 2 by the balance rod 30 incorporated in the hollow upper frame 3 and the boat support 21 provided between the current collecting boat 2 and the upper frame 3. Is kept constant, and the upper surface of the current collector boat 2 is kept horizontal. The single arm type pantograph has a smaller number of rod-shaped members constituting the link mechanism than the diamond-shaped pantograph, and therefore generates less aerodynamic sound (aerodynamic noise).

  As a single arm type pantograph, a pantograph in which the lengths of the upper frame and the lower frame are substantially equal is known (see, for example, Patent Document 1). In this pantograph, an aerodynamic sound is reduced by incorporating a balance rod in the hollow upper frame and a balance rod in the hollow lower frame. The trajectory in which the current collecting boat moves up and down is usually adjusted to be substantially vertical (see, for example, Patent Document 2). Pantographs with almost the same length of the upper and lower frames have a link mechanism that is almost vertically symmetrical with respect to the intermediate hinge that connects the upper and lower frames. Adjustment to be vertical is easy. However, in such a pantograph, since the intermediate hinge is located higher than the frame, it is not accommodated in the windshield that covers the frame, and generates aerodynamic sound by receiving an air current.

  In a single arm type pantograph, there are known ones in which the lower frame is made shorter than the upper frame and the height of the intermediate hinge from the frame is lowered (for example, Patent Document 3, Patent Document 4, and Patent Document 5). reference). In this pantograph, a balance bar is built in a hollow upper frame, and an intermediate hinge, a lower frame, and a balancing bar are housed in a windshield covering a base frame to reduce aerodynamic noise. In such pantographs, the windshield thickness is reduced in order to reduce the air resistance of the windshield, reduce aerodynamic noise generated from the windshield, and make it easier to fit the pantograph within the vehicle limit when the vehicle roof height is high. It is desirable. However, when the thickness of the windshield is reduced, the aerial sound of the pantograph is increased because the intermediate hinges and the like come out of the windshield.

JP-A-7-322409 JP-A-10-108303 JP 2004-187449 A JP 2004-274986 A JP 2005-130595 A

JIS E 6302: 2004 "Pantograph for railway vehicles"

  The present invention solves the above-described problems, and an object thereof is to provide a pantograph with a low aerial sound and low aerodynamic resistance.

  The pantograph of the present invention includes a current collector boat, an upper frame and a lower frame that support the current collector boat so that the current collector boat can be displaced in the vertical direction, a balancing rod provided side by side with the lower frame, and the lower frame and the balancing rod. A pantograph of a single arm type having a base frame that supports the base frame in a tiltable manner, and includes a windshield that covers the base frame, a lower part of the lower frame, and a lower part of the counter rod, A lower end is connected to an upper end of a lower frame and an intermediate hinge so that a crossing angle is variable, and the upper frame is an upper frame for covering the intermediate hinge and a portion where the balance bar protrudes above the windshield. A cover is fixed, and the lower frame is fixed with a lower frame cover for covering a portion protruding above the windshield, and the windshield has an opening through which the upper frame cover and the lower frame cover are inserted. And the upper frame cover is U-shaped by the lower frame cover in plan view. Surrounded by and, the opening, regardless of the vertical displacement of the current Denfune at collector, characterized in that it is closed by the upper frame cover and a lower frame cover.

In this pantograph, the lower frame is raised or lowered pivotally supported around the main shaft provided on the base frame, the lower frame cover rim opposed to the surface on the side closer to the collector vessel in the opening, In a side view, it is preferably formed in an arc shape centered on the main axis.

  In this pantograph, it is preferable that the lower frame cover is formed such that a surface of the opening facing the peripheral edge on the side far from the current collecting boat is formed in an arc shape centering on the main axis in a side view.

  In this pantograph, the upper frame is pivotably supported around the hinge axis of the intermediate hinge, and the upper frame cover is on the side close to the current collector boat and has a surface facing the lower frame cover. It is preferably formed in an arc shape centered on the hinge axis.

  In this pantograph, the upper frame cover may be formed such that a surface of the opening facing the peripheral edge on the side far from the current collecting boat has a substantially constant distance from the peripheral edge in a side view. preferable.

  In this pantograph, the lower frame cover has a movable portion that can be displaced downward at a portion of the upper surface that projects the upper frame downward, and the movable portion is moved downward by being pushed by the upper frame. It is preferable to displace.

  In this pantograph, the windshield has a storage cover that is displaced downward when pushed by the upper frame, and a part of the upper frame is accommodated in the windshield by the displacement of the storage cover downward. It is preferred that

  According to the pantograph of the present invention, the intermediate hinge and the portion where the balancing rod protrudes above the windshield are covered with the upper frame cover, and the portion where the lower frame protrudes above the windshield is covered with the lower frame cover. Aerodynamic noise is reduced. The windshield opening through which the upper frame cover and lower frame cover are inserted is closed by the upper frame cover and lower frame cover regardless of the vertical displacement of the current collector boat during current collection. Is prevented from occurring. Moreover, since the height of the upper surface of a windshield can be made lower than an intermediate hinge, the cross-sectional area of the windshield with respect to an air current can be made small, and the aerodynamic sound and air resistance by a windshield can be reduced. Further, since the thickness of the windshield can be reduced, it becomes easy to fit the pantograph within the vehicle limit even if the roof height of the vehicle is high.

The side view of the pantograph which concerns on one Embodiment of this invention. The top view of the pantograph. The perspective view near the center part of the pantograph. The side view near the center part of the pantograph. Plan view around the windshield opening in the pantograph The side view in the highest action height which saw through the pantograph. The side view in the standard action height which saw through the same pantograph. The side view in the minimum effect | action height which saw through the pantograph. The side view in the folding height which saw through the pantograph. The perspective view which shows the downward displacement of the movable part of the lower frame cover in the pantograph. The perspective view which shows the downward displacement of the storage cover in the pantograph. The figure which shows the link mechanism of a single arm type pantograph. The noise data of the fluttering direction of the Example and comparative example of this invention. The noise data of the anti-swing direction of the Example and comparative example of this invention.

  A pantograph according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the pantograph 1 of the present embodiment is a single arm type pantograph.

  As shown in FIG. 12, the link mechanism of the pantograph 1 is configured similarly to the link mechanism of a conventional single arm pantograph. The pantograph 1 includes a current collecting boat 2, an upper frame 3 and a lower frame 4, a balancing rod 5, and a base frame 6. The upper frame 3 and the lower frame 4 support the current collecting boat 2 so as to be displaceable in the vertical direction. The balancing rod 5 is not built in the lower frame 4 but is provided side by side with the lower frame 4. The underframe 6 supports the lower frame 4 and the balancing rod 5 so that they can be tilted up and down. The underframe 6 is supported on the roof of the railway vehicle by the insulator 7 and insulated from the roof.

  The pantograph 1 includes a boat support 21 and a balance rod 30 in addition to the upper frame 3, the lower frame 4, and the balancing rod 5 as links. The current collecting boat 2 is supported by the upper frame 3 via the boat support 21. The balance rod 30 is built in the hollow upper frame 3. The balance rod 30 and the boat support 21 maintain the posture of the current collecting boat 2 constant regardless of the vertical displacement of the current collecting boat 2, and the upper surface of the current collecting boat 2 is maintained horizontal. The trajectory of the current collector boat 2 being displaced in the vertical direction is adjusted by setting the length of the counter bar 5.

  The pantograph 1 has a windshield 8 (see FIGS. 1 and 2). As shown in FIG. 4, the windshield 8 covers the base frame 6, the lower part of the lower frame 4, and the lower part of the counter bar 5. The lower end of the upper frame 3 is connected to the upper end of the lower frame 4 and the intermediate hinge 9 so that the intersection angle is variable. An upper frame cover 31 is fixed to the upper frame 3. The upper frame cover 31 is for covering the intermediate hinge 9 and the portion where the counter bar 5 protrudes above the windshield 8. A lower frame cover 41 is fixed to the lower frame 4. The lower frame cover 41 is for covering a portion where the lower frame 4 protrudes above the windshield 8.

  As shown in FIG. 5, the windshield 8 has an opening 81 through which the upper frame cover 31 and the lower frame cover 41 are inserted. The upper frame cover 31 is surrounded by the lower frame cover 41 in a U shape in plan view. The opening 81 is closed by the upper frame cover 31 and the lower frame cover 41 regardless of the vertical displacement of the current collecting boat 2 during current collection.

Lower frame 4 is raised or lowered is pivotally supported around the main shaft 61 provided on the base frame 6 (see FIG. 4). In the lower frame cover 41, a surface 411 facing the peripheral edge 811 on the side close to the current collecting boat 2 in the opening 81 is formed in an arc shape centering on the main shaft 61 in a side view.

  In the lower frame cover 41, a surface 412 facing the peripheral edge 812 far from the current collecting boat 2 in the opening 81 is formed in an arc shape centering on the main shaft 61 in a side view.

  The upper frame 3 is pivotally supported around the hinge shaft 91 of the intermediate hinge 9 so as to be able to rise and fall. In the upper frame cover 31, a surface 311 facing the current collecting boat 2 and facing the lower frame cover 41 is formed in an arc shape centering on the hinge shaft 91.

  In the upper frame cover 31, a surface 312 facing the peripheral edge 813 on the side farther from the current collecting boat 2 in the opening 81 is formed in a shape in which the distance from the peripheral edge 813 is substantially constant in a side view.

  Each configuration of the pantograph 1 will be further described in detail. The shape of the current collector boat 2 is not limited, but a shape with small aerodynamic sound is desirable. In the present embodiment, a so-called wing-shaped hull is used for the current collecting boat 2 (see FIG. 2). The upper end of the upper frame 3 and the boat support 21 are covered with a smooth vertex cover 32 to reduce aerodynamic noise. The outer shape of the upper frame 3 is a cylinder or an elliptic cylinder.

  The windshield 8 covers the base frame 6, the lower part of the lower frame 4, and the lower part of the counter bar 5 (see FIG. 4), and when the current collecting boat 2 is low, the lower part of the lower frame 4. May cover the entire lower frame 4, and may cover the entire balancing rod 5 including the lower portion of the balancing rod 5. The windshield 8 is hollow, has a smooth outer shape that is flat up and down and resembles an ellipsoid extending in the front-rear direction, and is smoothly raised near the upper center (see FIG. 1). An opening 81 that is elongated in the front-rear direction is formed in the upper part of the windshield 8. The windshield 8 is composed of a plurality of curved members, and is made, for example, by molding FRP. Since the windshield 8 is insulated from the roof of a railway vehicle by the insulator 7, it does not need to be an insulator, for example, you may make it by shape | molding a metal plate. In the pantograph 1, the front-rear direction is the longitudinal direction of the railway vehicle.

  Although the shape of the insulator 7 is not limited, in this embodiment, in order to reduce aerodynamic sound and air resistance, it is an elliptical cylinder shape having a long diameter in the front-rear direction, and has a fold to prevent creeping discharge. .

  In the pantograph 1, the lower frame 4 and the balancing rod 5 protrude above the windshield 8 through the opening 81 depending on the height of the current collector boat 2 (see FIG. 4). Since the intermediate hinge 9 is located at the upper end of the lower frame 4, the intermediate hinge 9 is positioned above the windshield 8 when the lower frame 4 protrudes above the windshield 8. The upper frame cover 31 and the lower frame cover 41 cover the portion where the lower frame 4 and the counter bar 5 protrude above the windshield 8 and the intermediate hinge 9 and close the opening 81. Since the upper frame 3 and the lower frame 4 move with the vertical displacement of the current collecting boat 2 at the time of current collection, the upper frame cover 31 and the lower frame cover 41 also move. Even if the current collector boat 2 is displaced up and down, the opening 81 does not move. The upper frame cover 31 and the lower frame cover 41 have a shape that maintains the state where the opening 81 is closed even when the current collecting boat 2 is displaced up and down. The shapes of the upper frame cover 31 and the lower frame cover 41 are considered so that the aerodynamic sound generated by them is reduced, and for example, the ridgeline is rounded. The upper frame cover 31 and the lower frame cover 41 are made by molding FRP, for example.

  A surface 411 of the lower frame cover 41 is an arc surface having a radius R1 with the main shaft 61 as the center.

  The surface 412 of the lower frame cover 41 is an arc surface having a radius R2 with the main shaft 61 as the center.

  The surface 311 of the upper frame cover 31 is an arc surface having a radius R3 with the hinge shaft 91 as the center.

  The surface 312 of the upper frame cover 31 is not a simple shape such as a circular arc surface, and is constructed so that the distance from the peripheral edge 813 is substantially constant while the current collector boat 2 is displaced up and down using CAD. The shape obtained.

  In the upper frame cover 31, a surface 313 that connects the surface 311 and the surface 312 in the front-rear direction is a plane parallel to the front-rear direction (see FIG. 5). In the lower frame cover 41, a surface 413 connecting the surfaces 411 and 412 in the front-rear direction is a plane parallel to the front-rear direction, and a surface 414 facing the surface 313 of the upper frame cover 31 is in the front-rear direction. Parallel planes.

  In the opening 81, a peripheral edge 814 that connects the peripheral edge 811 and the peripheral edge 812 in the front-rear direction is a straight line parallel to the front-rear direction, and a peripheral edge 815 that connects the peripheral edge 812 and the peripheral edge 813 in the front-rear direction is parallel to the front-rear direction. Straight line. The peripheral edge 811 and the peripheral edge 813 are parallel. The distance between the pair of peripheral edges 814 is larger than the distance between the pair of peripheral edges 815.

  As shown in FIGS. 6 to 8, the pantograph 1 configured as described above follows the height change of the overhead wire during current collection, so that the current collector boat 2 is displaced in the vertical direction. The height from the rail to the upper surface of the current collector boat when the pantograph functions as a current collector is called the working height of the pantograph. When using a pantograph on a Shinkansen railway (the Shinkansen railway defined in Article 2 of the National Shinkansen Development Law), the maximum working height is 5300 mm (see Fig. 6), the standard working height is 5000 mm (see Fig. 7), and the minimum working height The height is 4800 mm (see FIG. 8). The standard working height of 5000 mm is the same as the standard height of the overhead wire. At the time of current collection of the pantograph 1, the current collector boat 2 is displaced within the range from the lowest action height to the highest action height. The opening 81 of the windshield 8 is closed by the upper frame cover 31 and the lower frame cover 41 regardless of the vertical displacement of the current collecting boat 2 during such current collection (see FIGS. 6 to 8).

  Note that the movable range in the vertical direction of the current collector boat 2 of the pantograph 1 is wider than the range from the lowest working height to the highest working height. As shown in FIG. 9, when the pantograph 1 is folded, the current collecting boat 2 becomes lower than the minimum action height and becomes the folding height. When the height of the current collector boat 2 is not restricted by an overhead line or the like, the current collector boat 2 becomes higher than the maximum working height and becomes a protruding height (not shown). When the current collecting boat 2 is out of the range from the lowest working height to the highest working height, the opening 81 of the windshield 8 may be blocked by the upper frame cover 31 and the lower frame cover 41, but is blocked. It doesn't matter.

  When the pantograph 1 is folded, in a side view, a part of the upper frame 3 has a positional relationship that interferes with the lower frame cover 41 and a positional relationship that interferes with the windshield 8 (see FIG. 9). In order to avoid such interference of the upper frame 3 during folding, if the lower frame cover 41 and the windshield 8 are simply provided with openings, aerodynamic noise is generated from these openings during current collection. Become.

  In the pantograph 1, as shown in FIG. 10, the lower frame cover 41 has a movable portion 415 that can be displaced downward at a portion of the upper surface where the upper frame 3 is projected downward. The movable portion 415 is displaced downward when pressed by the upper frame 3.

  When the current collecting boat 2 is at the working height, the movable portion 415 is biased upward and is flush with the surrounding surface. The movable part 415 is supported at the tip of an arm provided in the windshield 8. When the pantograph 1 is folded, the current collector boat 2 becomes lower than the minimum action height, and the lower part of the upper frame 3 pushes the movable part 415 downward. When the movable part 415 is pushed by the upper frame 3, the arm of the movable part 415 rotates around the base end side, so that the movable part 415 is displaced downward. In addition, the downward displacement of the movable part 415 is not limited to the displacement by rotation, You may comprise the movable part 415 so that it may displace by translation.

  In the pantograph 1, as shown in FIG. 11, the windshield 8 has a storage cover 82 that is displaced downward when pressed by the upper frame 3. A part of the upper frame 3 is stored in the windshield 8 when the storage cover 82 is displaced downward.

  The storage cover 82 is configured as a single door that opens downward. When the current collecting boat 2 is at the working height, the storage cover 82 is biased upward and closed, and is flush with the surrounding surface. When the pantograph 1 is folded, the lower part of the upper frame 3 pushes the storage cover 82 downward. When the storage cover 82 is pushed by the upper frame 3, it rotates about the side far from the lower frame cover 41 (right side in FIG. 11), and the side close to the lower frame cover 41 (left side in FIG. 11) is displaced downward. To do.

  As described above, according to the pantograph 1 according to the present embodiment, the intermediate hinge 9 and the portion where the balancing rod 5 protrudes above the windshield 8 are covered with the upper frame cover 31, and the lower frame 4 is above the windshield 8. Since the part which protrudes in is covered with the lower frame cover 41, aerodynamic sound becomes small (refer FIG. 4). The opening 81 of the windshield 8 through which the upper frame cover 31 and the lower frame cover 41 are inserted is blocked by the upper frame cover 31 and the lower frame cover 41 regardless of the vertical displacement of the current collecting boat 2 during current collection. Generation of aerodynamic sound from the opening 81 is prevented. Moreover, since the height of the upper surface of the windshield 8 can be made lower than the intermediate hinge 9, the cross-sectional area of the windshield 8 with respect to an air current can be made small, and the aerodynamic sound and air resistance by the windshield 8 can be reduced. Moreover, since the thickness of the windshield 8 can be reduced, it becomes easy to fit the pantograph 1 within the vehicle limit even if the roof height of the vehicle is high. Furthermore, even if the lower frame 4 comes out above the windshield 8, since it is covered with the lower frame cover 41, aerodynamic noise can be reduced and the lower frame 4 can be lengthened. As a result, the degree of shortening the lower frame 4 compared to the upper frame 3 is relaxed, the vertical asymmetry of the link shape is relaxed, and the trajectory of the current collector boat 2 can be easily adjusted.

  In the lower frame cover 41, the surface 411 facing the peripheral edge 811 on the side close to the current collector boat 2 in the opening 81 is formed in an arc shape centering on the main shaft 61 in a side view. Even if the lower frame 4 undulates along with the vertical displacement, the space between the surface 411 of the lower frame cover 41 and the peripheral edge 811 of the opening 81 does not expand. Thereby, generation of aerodynamic sound from the gap between the surface 411 and the peripheral edge 811 is prevented.

  In the lower frame cover 41, the surface 412 facing the peripheral edge 812 on the side far from the current collecting boat 2 in the opening 81 is formed in an arc shape centering on the main shaft 61 in the side view. Even if the lower frame 4 rises and falls with the vertical displacement of the upper and lower sides, the space between the surface 412 of the lower frame cover 41 and the peripheral edge 812 of the opening 81 does not expand. As a result, generation of aerodynamic sound from the gap between the surface 412 and the peripheral edge 812 is prevented.

  The upper frame cover 31 is located on the side close to the current collecting boat 2 and the surface 311 facing the lower frame cover 41 is formed in an arc shape with the hinge shaft 91 as the center. Accordingly, even if the crossing angle between the upper frame 3 and the lower frame 4 changes, the space between the surface 311 of the upper frame cover 31 and the lower frame cover 41 does not expand. Thereby, generation of aerodynamic sound from the gap between the surface 311 and the lower frame cover 41 is prevented.

  In the upper frame cover 31, the surface 312 facing the peripheral edge 813 on the side far from the current collecting boat 2 in the opening 81 is formed in a shape in which the distance from the peripheral edge 813 is substantially constant in a side view. Even if the upper frame 3 rises and falls with the vertical displacement of the electric boat 2, the space between the surface 312 of the upper frame cover 31 and the peripheral edge 813 of the opening 81 does not expand. Thereby, generation of aerodynamic sound from the gap between the surface 312 and the peripheral edge 813 is prevented.

  Since the lower frame cover 41 has a movable portion 415 that is displaced downward when pressed by the upper frame 3, interference between the upper frame 3 and the lower frame cover 41 can be avoided when the pantograph 1 is folded. When the movable portion 415 is not pushed by the upper frame 3, the movable portion 415 is not displaced, and generation of aerodynamic sound from the lower frame cover 41 can be prevented.

  Since the windshield 8 has a storage cover 82 that is displaced downward when pushed by the upper frame 3, interference between the upper frame 3 and the windshield 8 can be avoided when the pantograph 1 is folded. A part of the upper frame 3 is stored in the windshield 8 by the storage cover 82 being displaced downward, so that the folding height of the pantograph 1 can be lowered. When the storage cover 82 is not pressed by the upper frame 3, the storage cover 82 is not displaced, and generation of aerodynamic sound from the windshield 8 can be prevented.

  As an example of the present invention, a 1/3 scale model of the pantograph 1 of the present invention was created (see FIGS. 1 and 2). Moreover, the 1/3 scale model of the pantograph described in patent document 5 was created as a comparative example. The scale 1/3 is a value relative to the size of the actual machine when the pantograph is used for the Shinkansen railway. Using these scale models, wind tunnel experiments were conducted in a large, low-noise wind tunnel (Wind Tunnel Technology Center, Railway Technical Research Institute).

  Each of the example and the comparative example was put in a wind tunnel, and noise (sound pressure level) was measured under the same measurement conditions using a normal sound level meter. The wind speed in the wind tunnel experiment was 300 km / h. The height of the current boat was the standard height. In an embodiment, the intermediate hinge is out of the windshield. In the comparative example, the intermediate hinge is in the windshield.

  Compared with the comparative example, in the general sound of the A characteristic (OA value), the embodiment receives the airflow in the fluttering direction (rightward in FIG. 1) and the airflow in the anti-fluttering direction (leftward in FIG. 1). The sound pressure level was low in both cases. The A characteristic is a frequency weighting characteristic in consideration of human hearing in a normal sound level meter.

  When the sound pressure level was subjected to frequency analysis, as shown in FIG. 13, the sound pressure level of the example was smaller than that of the comparative example in almost all frequencies except near 200 Hz in the fluttering direction. As shown in FIG. 14, in the anti-fluttering direction, the sound pressure level of the example was lower than that of the comparative example at almost all frequencies except around 200 Hz, as in the fluttering direction. That is, it was confirmed that the pantograph 1 of the present invention has a lower aerodynamic sound than the conventional pantograph with the intermediate hinge inside the windshield even when the intermediate hinge 9 is outside the windshield 8.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, the insulator 7 that supports the underframe 6 may have a shape having a crease in a circular column.

1 Pantograph 2 Current collector boat 3 Upper frame 31 Upper frame cover 311 Upper frame cover surface 312 Upper frame cover surface 4 Lower frame 41 Lower frame cover 411 Lower frame cover surface 412 Lower frame cover surface 415 Movable part 5 Balance Rod 6 Base frame 61 Main shaft 8 Windshield 81 Opening 811 Opening peripheral edge 812 Opening peripheral edge 813 Opening peripheral edge 82 Storage cover 9 Intermediate hinge 91 Hinge axis θ Crossing angle

Claims (7)

A current collecting boat, an upper frame and a lower frame that support the current collecting boat so as to be displaceable in the vertical direction, a balancing rod provided side by side with the lower frame, and a lower frame and a balancing rod that are supported upside down. A pantograph of a single arm type having a base frame to perform,
A windshield covering the underframe, the lower portion of the lower frame, and the lower portion of the balancing rod;
The lower end of the upper frame is connected to the upper end of the lower frame and an intermediate hinge so that the crossing angle is variable,
The upper frame is fixed with an upper frame cover for covering the intermediate hinge and a portion where the counterbalance protrudes above the windshield,
The lower frame is fixed with a lower frame cover for covering a portion protruding above the windshield,
The windshield has an opening through which the upper frame cover and the lower frame cover are inserted,
The upper frame cover is surrounded in a U shape by the lower frame cover in plan view,
The pantograph is characterized in that the opening is closed by the upper frame cover and the lower frame cover regardless of the vertical displacement of the current collecting boat during current collection. The lower frame is raised or lowered is pivotally supported around the main shaft provided on the underframe,
The surface of the lower frame cover facing the peripheral edge on the side close to the current collecting boat in the opening is formed in an arc shape centering on the main axis in a side view. The pantograph described.   3. The lower frame cover, wherein a surface of the opening facing the peripheral edge on the side far from the current collecting boat is formed in an arc shape centering on the main axis in a side view. The pantograph described. The upper frame is pivotably supported around the hinge axis of the intermediate hinge,
The said upper frame cover is a side close | similar to a current collector boat, The surface facing the said lower frame cover is formed in the circular arc shape centering on the said hinge axis | shaft. pantograph.   The upper frame cover is formed such that a surface of the opening facing the peripheral edge on the side far from the current collecting boat is formed in a shape in which the distance from the peripheral edge is substantially constant in a side view. Item 5. The pantograph according to Item 4. The lower frame cover has a movable portion that can be displaced downward on a portion of the upper surface that projects the upper frame downward.
The pantograph according to any one of claims 1 to 5, wherein the movable portion is displaced downward by being pushed by the upper frame. The windshield has a storage cover that is displaced downward by being pushed by the upper frame,
The pantograph according to claim 6, wherein a part of the upper frame is stored in the windshield by the storage cover being displaced downward.

Images