CA2052716A1 - Machine for monitoring the vertical position of a contact wire of an overhead line - Google Patents
Machine for monitoring the vertical position of a contact wire of an overhead lineInfo
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- CA2052716A1 CA2052716A1 CA 2052716 CA2052716A CA2052716A1 CA 2052716 A1 CA2052716 A1 CA 2052716A1 CA 2052716 CA2052716 CA 2052716 CA 2052716 A CA2052716 A CA 2052716A CA 2052716 A1 CA2052716 A1 CA 2052716A1
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- measuring
- track
- monitoring frame
- monitoring
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Abstract
MACHINE FOR MONITORING THE VERTICAL POSITION
OF A CONTACT WIRE OF AN OVERHEAD LINE
Abstract of the Disclosure In a machine for monitoring the vertical position of a contact wire of an overhead line extending above a track, which comprises a self-propelled machine frame including a superstructure, an undercarriage supporting the machine frame on the track and having wheels journaled on a wheel axle and engaging the running faces of the track rails, and a vertically adjustable measuring yoke mounted on the machine frame, a frame is vertically adjustably mounted on the machine frame for monitoring the vertical position of the contact wire, the monitoring frame having an upper end and a device connected to the upper monitoring frame end for measuring the vertical position of the contact wire, and a lower end at a fixed distance from the plane.
OF A CONTACT WIRE OF AN OVERHEAD LINE
Abstract of the Disclosure In a machine for monitoring the vertical position of a contact wire of an overhead line extending above a track, which comprises a self-propelled machine frame including a superstructure, an undercarriage supporting the machine frame on the track and having wheels journaled on a wheel axle and engaging the running faces of the track rails, and a vertically adjustable measuring yoke mounted on the machine frame, a frame is vertically adjustably mounted on the machine frame for monitoring the vertical position of the contact wire, the monitoring frame having an upper end and a device connected to the upper monitoring frame end for measuring the vertical position of the contact wire, and a lower end at a fixed distance from the plane.
Description
2 ~ j c~ r~ ;3 BACKG~OUND OF T~ E I~ENTION
1. Field of the Invention The present invention relates to a machine for monitoring the vertical position of a contact wire of an overhead line extending above a track comprising two rails having running faces definlng a plane, which comprises a self-propelled machine frame including a superstructure, which may be a car box, an undercarriage supporting the machine frame on the track and having wheels journaled on a wheel axle and engaging the running faces o~ the track rails, and a vertically adjustable measuring yoke mounted on the machine frame.
2. Description of the Prior Art The malntenance of electric railroad rights of way require not only track work but also the proper maintenance o~
the overhead line, and this has gained added importance as train speeds have increased, which requires accurate maintenance of the contact wire position. Self-propelled boom cars of the above-indicated type have been used for the maintenance and servicing of overhead lines. Their measuring yok is a vertically adjustable pantograph mechanism mounted on the car box and, as the car advances along the track, the measuring yoke engages the contact wire and electronically monitors its position, and the monitored data are graphically recorded. While these machines have been successfully used, the vertical measurement results are sometimes falsi~ied because the resilient mounting of the car box on the undercarriage tends to change its distance from the plane defined by the running faces of the track rails.
7 ~ ~
SUMM~ARY OF T~IE_INVF.NTIQN
It is the pr:imary object o~ this invention so to improve a machine of the indicated type that a dependable and accurate monitoring alld control of the vert.ical position of the contact wire of an overhead line i5 a!;sured under various operating conditions.
In a machine for mon.itor:ing the vertical posikion of a contact wire of an overhead l.ine extendiny above a track comprising two rails having running faces definlng a plane, which comprises a self-propelled machine frame including a superstructure, an undercarriage supporting the machine frame on the track and having wheels journaled on a wheel axle and engaging the running faces of the track rails, and a vertically adjustable measuring yoke mounted on the machine frame, the above and other objects are accomplished according to the invention with a frame vertically adjustably mounted on the machine frame for monitoring the vertical position of the contact wire, the monitoring frame having an upper end and a device connected to the upper monitoring frame end for measuring the vertical position of the contact wire, and a lower end at a fixed distance from the plane, which may engage the wheel axle or the plane defined by the track rail running faces.
This arrangement has the advantage that the vertical distanca of the contact wire from the running plane of the machine is measured directly and accurately without .-- falsification by the vibrating motions of the resiliently mounted machine frame since the monitoring frame is not fixedly but vertically adjustable mounted thereon.
According to one embodiment of the present invention, wherein the undercarriage comprises a bearing for the wheel axle, and the machine ~urther comprises a horizon-tal support plate a~eixed to the bearing and extending parallel to the plane defined by the track rai:l running faces, the lower monitoriny frame end engaying the support plate. This provides a measuring base serving as ~ dependable reference for measuring the vertical position of the contact wire by the monitorin~ frame since its distance ~rom the running face of the track rail xemains constant. If the lower monitoxing frame end has rollers engaging the support plates on the axle bearings, they will assure a ready relative transverse displacement between the support plates on the undercarriage and the machine frame carrying the monitoring frame in track curveæ.
According to one preferred feature of thie invention, the monitoring frame comprises two vertically adjustable vertical rods spaced from each other in a direction transverse to the track, each rod comprising two parts and a screw thread interconnecting the rod parts for vertical adjustment thereof.
The vertical adjustment of the rod parts will change the length o~ the monitoring frame rods to compensate for any vertical distance change due to wear of the undercarriage wheels. The vertical rods may pass through the superstructure and have upper ends projecting thereabove, and the monitoring frame may further comprise a spacing member extending in a direction transverse to the track and respective joints linking the spacing member to the upper rod ends, the measuring device being connected to the spacing member. This will prevent a resilient movement of the machine frame on one side thereof from exerting a torque on the monitoring frame and bending it.
In accordance with another embodiment, the measuring device comprises a vertically extending threaded spindle carrying a vertical linear measuring scale, a handwheel for ~ ~ c~ 2 1 ~ ~
turning the ~.pindle, a horizontal sliding ledye connected to the thr~ad~d spindle and extending in a direction transverse to the track, the ~liding edge carrying a linear measuring scale, and a holding element slidably mounted on the sliding adge, the holding element carrying a vertical linear measuring scale. This arrangement allows a simple and accurately readable m~asurement of the vertical contact wire position during the installation of the overhead line, the transverse displaceability of the holding element permitting adaptation to the zig-zag course of the con-tact wirè.
The measuring device preferably further comprises an electronic displacement pickup arranged preferably insulated between the measuring yoke and the monitoring frame. This enables the vertical position of the contact wire to be electronically measured during the continuous advance of the machine along the track, and the electronically measured data may be transmitted to a terminal for processing by an operator. The pickup may be a rotary potentiometer.
The undercarriage wheels are preferably flanged wheels engaging the tr~ck rails and i~ a transmission is connected to the wheel axle between the flanged wheels, the monitoring frame is arranged batween the flanged wheels and the lower monitoring frame end is connected to the transmission according to another preferred embodiment. This arrangement is simple and space-saving, the monitoring frame being concentrated in a small area so that it may be centered between the flanged wheels in tha transverse direction immediately adjacent a protective wall of the machine frame superstructure. Since the monitoring frame is mounted on the transmission on the wheel axle, an accurate vertical measurement between the track rail running faces and the contact wire may be obtained. Any influence on the measurement results of unavoidable slight rotary movements of ~J~32~
the transmission ~t the start of the machine ~dvance and at the brakin~ of the advance will be avoided if the lower monitoring frame end i3 connected to a æhaft mounted on the transmission and extending in a direction transverse to the track, the lower monitoring frame end being connected to the shaft.
According to another preferred feature, the measuring device comprises a measuring beam extending in a direction transverse to the tracX and parallel to the wheel axle, and a vertical adjustment drive interconnects the lower and upper monitoring frame ends for vertically adjusting the upper monitoring frame end relative to the lower monitoring frame end. This enables a rapid displacement of the measuring beam from a rest po~ition into an operating position in engagement with the contact wire. The measuring beam has a longitudinally extending upper edge, and the measuring device may further comprise a measuring ledge vertically spaced from, and extending parallel to, the upper measuring beam edge, a pivot extending parallel to the wheel axle in a direction transverse to the track, the pivot pivotally supporting the measuring ledge on the measuring beam for pivot;.ng thereabout, the measuring ledge having a longitudinally extending upper edge for engagement with the contact wire, and a coil spring connected to the measuring ledye ~or biasing the upper measuring ledge edge away from the upper measuring beam edge.
In this way, any errors in the vertical po~ition of the contact wire engaged by the measuring ledge may be immediately detected by monitoring changes in the distance between the upper edges of the measuring beam and pivotal measuring ledge.
Such vertical position errors may be accurately and continuously detected by a displacement pickup affixed to the adjustment drive and connected to the upper measuring ledge edge.
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Preferably and lf the adju~tment drive is hydraulically operated and comprises a hydraulic valve controlling the operation of the drive, a limit switch is arranged between the measuring be~m and the measuring ledge, and the limit switch is connected to the hydraulic valve and controls the operation thereof. This assures a steady pres~ure of the pivotal and spring-biased measuring ledge against the contact wire in dependence on any erroneous vertical position thereo~ so that this position may always be monitored at the regular contact pressure of the electric conductor engaging the contact wire during train operations.
If the adjustment drive is hydraulically operated and comprises a vertical cylinder having a longitudinal axis, at least one guide rod extending parallel to the drive cylinder and a guide block affixed to the drive cylinder are preferably provided, the guide rod or rods being vertically adjustably guided in the guide block. Thi~ will prevent the measuring beam from being turned so that it will remain in the correct transverse position in every vertical position.
The actual vertical position of the contact wire may be read at all times if a measuring ledge extending vertically to the wheel axle is connected to the measuring beam and carries a vertical linear measuring scale.
According to yet another preferred feature, the machine frame comprises two parallel guide ledges extending in a direction transverse to the track, the guide ledges defining an opening through which the lower monitoring frame end passes and the lower monitoring frame end being guided by the guide ledges without play, the opening have a greater width extending in the transverse direction than the corresponding width of the lower monitoring frame end. This enables the monitoring frame to move transversely relative to the machine 27~.~
frame in accordance with the track position and indepPndently of vibrat.i.ng machine frame.
In accordance with a furt:her embodiment, flanged wheels are mounted on the lower monitoring frame end for engaging the running faces of the track rails. This enables the lower monitoring frame end to be di~posed at a fixed distance from the running plane under various undercarriaye structures.
BRIEF rDESCRIPTION OF _THE ORAWING
The above and other objects, advantayes and features of the present invention wi].l become more apparent from the following detailed description of certain now preferred embodiments thereof, ta]cen in conjunction with the somewhat diagrammatic accompanying drawing wherein FIG. 1 is a fragmentary perspective view showing one embodiment of the machine of this invention;
FIG. 2 is a side elevational view of the measuring yoke of the machine of FIG. 1;
FIG. 3 is a fragmentary side elevation view showing another embodiment of a support for the lower monitoring frame end;
FIG. 4 is a fragmentary side elevational view showing another embodiment of the measuring yoke;
FIG. 5 is a side elevational view showing another embodiment of the machine of the invention;
PIG. 6 is an enlarged end view, partly in section, of the monitoring frame of the machine of FIG. 5, seen in the 2 ~
directi~n of arrow VI therein;
FIG. 7 is an enlarged end view of the measuring beam and ledge of this monitoring frame;
FIG. 8 is a side elevational view of the measuring beam and ledge of FIG. 7; and , ~
FIGS. 9 and 10 are schematic end v.iews of further embodiments.
DETAILED DESCRIP?ION OF PREFERRED EMBOD~
Referr.ing now to the drawing and first to FIGS. 1 and 2, there is shown schematically indicated machine 1 for monitoring the vertical position of contact wire 18 of overhead line lg extendlng ahove trac]c 4 comprising two rails having running faces defining a plane. The machine comprises self propelled machine frame 2 including superskructure 14 aonstituted by a car box. Undercarriaga 3 supports machine frame 2 on the track and has wheels journaled on a wheel axle and engaging the running faces of the track rails. Vertically adjustable measuring yoke 28 is mounted on machine frame 2, i.e. on its superstructure in the illustrated embodiment.
Fra~e 5 is vertically adjustably mounted on machine frame 2 for monitoring the vertical position of contact wire 18.
The monitoring frame has upper end 13 and device 17 is connected to the upper monitoring frame end for measuring the vertical position of the contact wire, while lower end 8 is held at a fixed distance from the plane defined by the running faces of the track rails.
Undercarriage 3 of machine 1 comprises bearings 11 for the wheel axle, and horizontal support plates 10 are affixed 7 ~ ~
to the bearing~ ~nd extend parallel to the plane defined by th~ trac~ rail running faces, low~r monitoring frame end 8 engaging the support plates. Ag shown, rollers 9 at the lower monitoring frame end engage the support plates. support plates lo have a ~ufficient width to assure eny~gement of roller~ g with the support plates even in sharp track curves when a relative transverse displacement o~ undercarriage 3 and machine ~rame 2 occurs. Monitoring Prame 5 of the embodiment of FIG. 1 comprises two vertically adjustable vertical rods 7, 7 spaced from each other in a direction transverse to track 4, each rod comprising two parts and screw -thread 12 interconnecting the rod parts for adjustment o~ the rod length. This adjustment compensates ~or a reduction in the wheel diameter due to wear, which leads to a corresponding lowering of support plate 10.
As shown, vertical rods 7 pass through superstructure 14 and have upper ends 13 projecting thereabove, and monitoring frame 5 further comprises spacing member 16 extending in a direction transverse to track 4 and respective joints 15 link spacing member 16 to upper rod ends 13. Measuring device 17 is connected to the spacing member. It comprises A-shaped support frame 20 for vertically extending threaded spindle 21 arranged substantially in a central plane o~ track 4 and carrying vertical linear measuring scale 22. The lower end of spindle 21 carries handwheel 23 for turniny the spindle so that the measuring scale may be vertically adjusted relative to monitoring frame 5. Horizontal sliding ledge 24 is connected to an upper end of the threaded spindle and extends in a direction transverse to the track, the sliding edge carrying linear measuring scale 25. Holding element 26 is slidably mounted on sliding edge 24, the holding element carrying vertical linear measuring scale 27.
As shown in FIGS. 1 and 2, vertically adjustable 2~7 ~. ~
mea~uring yoke 2~ is mounted on the roof of car box 14 for engagement with contact wire 18. For measuring the vertical position o~ contact wire 18 while machine l ~dvances along track 4, electronic displacem~sn-t pickup 29 is arranged between measuring yoke 28 and monitoring frame 5. In this monitoring operation, measuring frame 5 provides an absolute.ly dependable and constant reference base for determining the vertical distance of the contact wire Erom the running plane of track 4 because it is mounted directly on undercarriage 3 and thus is not subject to any vibrating motions due to the resilient mounting of machine frame 2 on the undercarriage, khe mounting of the monitoring frame being independent of the machine frame. However, since measuring yoke 28 is af~ixed to the machine frame and any vertical vibratory motion of the machine frame and sup~rstructure is, therefore, detected by displacement pickup 29 and could falsify the measurements of the vertical position of contact wire 18, the pickup is connected to measuring frame 5 by a cable or rope trained over rotatable guide roller 30 affixed to the roof of car box 14 to compensate for any vertical movements of the car box relative to monitoring frame 4.
FIG. 3 schematically illustrates machine 32 for monitoring the vertical position of a contact wire of an overhead line extending above track 35 comprising two rails 34 having running faces defining a plane. The machine comprises self-propelled machine frame 31 and undercarriage 33 supporting machine frame 31 on the track and has wheels journaled on a wheel axle and engaging the running faces of the track rails. Vertical guide rod 36 of monitoring ~rame 37 is vertically adjustably guided in machine frame 31 and its lower end 38 is supported on horizontal support plate 39 in a manner similar to the one described in connection with FIG. 1.
However, support plate 39 is affixed to flanged wheel 40 linked to undercarriage 33 by rod 41. Functionally equivalent -- 10 -- ~
~ 3 to the arrange.ment oP YIG. 1, the support plate provLdes a fixed reference base for the vertical posi-tion measurement of the contact wire.
In the embodiment of FIG. 4, vertically adjustable measuring y~ke 42 on machine 43 is mounted on the roo~ of car box 46 for controlling contact wire 44 of overh~ad line 45.
Monitoring frame 47 is vertically adjustably mounted on machine frame 48 of machine ~3, and measuring device ~9 connected to the upper end of the monitoring frame comprises a displacement pickup in the form o~ potentiometer 50 arranged between monitoring frame 47 and measuring yoke ~2. Electrical insulation 51 is arranged between potentiometer 50 and the measuring yoke.
The machine of the present invention may be used in the installation of a n~w overhead line ~or operation of electric trains or in the maintanance, servicing and repair of the contact wire of an existing overhead line, on the one hand, and for monitoring the vertical position of an overhead line in use during the continuous advance of the machine along the track, on the other hand. In the first case, the measuring scales on measuriny device frame 20 are used while the machine stands still, and the measures are used by the installing or maintenance personnel to mount or re-arrange contact wire 18 in the correct vertical position. In the second case, the measuring scales are not used and measuring yoke 28 is utilized for monitoring the vertical position of the contact wire while an operator on machine 1 may also visually monitor the zig-zag course of contact wire 18 by means of markings on the measuring yoke.
Various means (not illustrated~ may be used for measuring the vertical position o~ the contact wire, such as optical eye arrangements and other opto-electronic means as well as ~r,~ J
inductive proximity fuses for detectiny the position o~ the , contact wire without phys.ic~l contact therewith.
FIG. 5 illustrates anoth~r embodiment therain machine 52 has undercarriages 53 with flanged wheels 68 en~aging track rails 58 of track 59. The machine further comprises machine frame 54 carrying superstructure 55 on which vertically displaceable and rotatable work platform 56 is mounted.
Machine 52 is propelled along the track by drive 57. Power is transmitted from drive 57 to flanged wheels 68 by transmission 62 connected to wheel axle 67 between the flanged wheels, and monitoring frame 60 is arranged centrally between the flanged wheels imm~diately adjacent an end wall of superstructure 55 outside this superstructure. Lower monitoring ~rame end 61 is connected to transmission 62 on wheel axle 67. Upper end 63 of monitoring frame 60 is connected to a measuring device ~or monitoring the vertical position of contact wire 66, and this measu~ing device comprises measuring beam 64 extending in a direction transverse to track 59 and parallel to wheel axle 67. Vertical adjustment drive 65 interconnects lower and upper monitoring frame ends 61, 63 for vertically adjusting upper monitoring frame end 63 relative to lower monitoring frame end 61. Rotatable shaft 69 is mounted on transmission gear box 62 and extends in a direction transverse to track 59, and lower monitoring frame end 61 is connected to the shaft so that the monitoring frame may rotate relative to the wheel shaft.
As shown in FIGS. 6 and 7, measuring frame 60 comprises vertical carrier rod 70. Adjustment drive 65 is hydraulically operated and comprises vertical cylinder 72 concentric with the carrier rod and having longitudinal axis 71 extending perpendicularly relat.ive to wheel axle 67, and piston rod 73 connected to measuring beam 64. Guide rods 74 extend parallel to drive cylinder 72 and guide block 75 is affixed to the r7~ ~
drive cylinder, the guide rods beiny vertically adjustably guided in the guide block.
Measuring beam 64 has longitudinally extending upper edge 77, and the measuring device further comprises measuring ledge 76 vertically spaced ~rom, and extending parallel to, upper measuring ~eam edge 77. Pivot 78 extending parallel to wheel axle 67 in a direction transversa to the track pivotally supports measuring ledge 76 on measuriny beam 64 for pivoting thereabout, the measuring ledge having longitudinally extending upper edge 80 for engagement with contact wire 66.
Coil spring 79 is anchored on measuring beams 64 and connected to measuring ledge 76 for biasing upper measuring ledge edge 80 away ~rom upper measuring beam edge 77. Displacement pickup 81, illustrated as a rotary potentiometer, is affixed to adjustment drive 65 by a bracket on drive cylinder 72 and is connected to upper measuring ledge edge 80 by cable or rope 82 extending parallel to longitudinal axis 71 of the drive cylinder. As shown in FIGS. 7 and 8, limit switch 83 is arranged between measuring beam 64 and measuring ledge 76, and hydraulically operated adjustment drive 65 comprises hydraulic valve 84 controlling the operation of the drive.
Limit switch 83 is connected to hydraulic valve 84 and controls the operation thereof. Furthermore, another measuring ledge 88 is connected to measuring beam 64 and extends vertically to wheel axle 67, measuring ledgs 88 carrying a vertical linear measuring scale.
As shown in FIG. 6, machine frame 54 comprises two parallel yuide ledges 86 extending in a direction transverse to track 59 and defining opening 85 through which lower monitoring frame end 61 passes and is guided by guide ledges 86 without play. Opening 85 has a greater width extending in the transverse direction than the corresponding width of the lower monitoring frame end. A similar guide for the ~3~3~
mon:Ltorlng frame is .shown a-t B7 at the top o~ superstructure 55, such a gllide hracket beirlg illustr~ted in FIG. 5 affixed to the end wall of the superstructure.
To monitor the vertical position o~ contact wire 66, monitoring frame 60 is vertically adjusted by drive 65 until measuring ledge 76 engages the contact wire. Limit switch 83 and the bias o~ coil spring 79 are so coordinated that the limit switch will actuate hydraulic valve 84 for interrupting the operation of adjustment drive 65 when the coil spring exerts the desired contact pressure on the measuring ledge for engaging the contact wire, for example 1 kp. In thi.s position of measuring ledge 76, the actual distance of contact wire 66 engaged by upper measuring ledge edge 80 from the running plane defined by the running faces of track rails 58 may be readily read from the measuring scale on vertical measuring ledge 88. Displacement pickup 81 at the same time converts the vertical measurement into electrical signals which may be converted into digital read-outs, if desired.
As machine 52 is advanced continuously along track 59, any deviation of the vertical position of contact wire 66 engaged under pressure by measuring ledge 76 will cause the measuring ledge to be pivoted about pivot axle 78, and limit switch 83 will actuate hydraulic valve 84 to operate adjustment drive 65 for vertical adjustment of monitoring frame 60 until the above-described coordination between the limits switch and the coil spring bias will cause the actuation of the adjustment drive to be halted again. In this way, the distance bet.ween measuring beam 64 and contact wire 66 remains essentially constant during the antire monitoring operation. The described change in the vertical position of the measuring beam relative to displacement pickup 81 and the track running plane when the measuring ledge detects a deviation in the vertical position of the contact wire is ~, ~3 ~ L &
recorded by the pickup. This constant and automatic control of the vertical position of measuring be~m 64 and the position of measuring ledge 76 relative thereto has the ad~antage that, regardless of any detected deviations of the vertical position of contact wire 66, the same contact pressure o~ the measuring ledge against the contact wire is assured. In this way, the monitoring of the vertical oontact wire position by machine 52 is always e~fected under the same conditions pr~vailing when a trolley arm of an electric loc:omotive engages the contact wire.
FIG. 9 schematically illustra-ked an embodiment of a machine including machine frame 92, which is quite similar to that described hereinabove in connection with FIGS. 5 to 8.
In this embodiment, the lower end of monitoring frame 89 (which is quite similar to monitorin~ frame 60) is supported on flanged wheels gO for engayiny the running faces of track rails 91, i.e. directly on the track rather than on the wheel axle.
The similar illustration of FIG. lo shows the lower ends of monitoring frame g3 supported on journal boxes 94 of undercarriage 95 of the machine.
- 15 ~
1. Field of the Invention The present invention relates to a machine for monitoring the vertical position of a contact wire of an overhead line extending above a track comprising two rails having running faces definlng a plane, which comprises a self-propelled machine frame including a superstructure, which may be a car box, an undercarriage supporting the machine frame on the track and having wheels journaled on a wheel axle and engaging the running faces o~ the track rails, and a vertically adjustable measuring yoke mounted on the machine frame.
2. Description of the Prior Art The malntenance of electric railroad rights of way require not only track work but also the proper maintenance o~
the overhead line, and this has gained added importance as train speeds have increased, which requires accurate maintenance of the contact wire position. Self-propelled boom cars of the above-indicated type have been used for the maintenance and servicing of overhead lines. Their measuring yok is a vertically adjustable pantograph mechanism mounted on the car box and, as the car advances along the track, the measuring yoke engages the contact wire and electronically monitors its position, and the monitored data are graphically recorded. While these machines have been successfully used, the vertical measurement results are sometimes falsi~ied because the resilient mounting of the car box on the undercarriage tends to change its distance from the plane defined by the running faces of the track rails.
7 ~ ~
SUMM~ARY OF T~IE_INVF.NTIQN
It is the pr:imary object o~ this invention so to improve a machine of the indicated type that a dependable and accurate monitoring alld control of the vert.ical position of the contact wire of an overhead line i5 a!;sured under various operating conditions.
In a machine for mon.itor:ing the vertical posikion of a contact wire of an overhead l.ine extendiny above a track comprising two rails having running faces definlng a plane, which comprises a self-propelled machine frame including a superstructure, an undercarriage supporting the machine frame on the track and having wheels journaled on a wheel axle and engaging the running faces of the track rails, and a vertically adjustable measuring yoke mounted on the machine frame, the above and other objects are accomplished according to the invention with a frame vertically adjustably mounted on the machine frame for monitoring the vertical position of the contact wire, the monitoring frame having an upper end and a device connected to the upper monitoring frame end for measuring the vertical position of the contact wire, and a lower end at a fixed distance from the plane, which may engage the wheel axle or the plane defined by the track rail running faces.
This arrangement has the advantage that the vertical distanca of the contact wire from the running plane of the machine is measured directly and accurately without .-- falsification by the vibrating motions of the resiliently mounted machine frame since the monitoring frame is not fixedly but vertically adjustable mounted thereon.
According to one embodiment of the present invention, wherein the undercarriage comprises a bearing for the wheel axle, and the machine ~urther comprises a horizon-tal support plate a~eixed to the bearing and extending parallel to the plane defined by the track rai:l running faces, the lower monitoriny frame end engaying the support plate. This provides a measuring base serving as ~ dependable reference for measuring the vertical position of the contact wire by the monitorin~ frame since its distance ~rom the running face of the track rail xemains constant. If the lower monitoxing frame end has rollers engaging the support plates on the axle bearings, they will assure a ready relative transverse displacement between the support plates on the undercarriage and the machine frame carrying the monitoring frame in track curveæ.
According to one preferred feature of thie invention, the monitoring frame comprises two vertically adjustable vertical rods spaced from each other in a direction transverse to the track, each rod comprising two parts and a screw thread interconnecting the rod parts for vertical adjustment thereof.
The vertical adjustment of the rod parts will change the length o~ the monitoring frame rods to compensate for any vertical distance change due to wear of the undercarriage wheels. The vertical rods may pass through the superstructure and have upper ends projecting thereabove, and the monitoring frame may further comprise a spacing member extending in a direction transverse to the track and respective joints linking the spacing member to the upper rod ends, the measuring device being connected to the spacing member. This will prevent a resilient movement of the machine frame on one side thereof from exerting a torque on the monitoring frame and bending it.
In accordance with another embodiment, the measuring device comprises a vertically extending threaded spindle carrying a vertical linear measuring scale, a handwheel for ~ ~ c~ 2 1 ~ ~
turning the ~.pindle, a horizontal sliding ledye connected to the thr~ad~d spindle and extending in a direction transverse to the track, the ~liding edge carrying a linear measuring scale, and a holding element slidably mounted on the sliding adge, the holding element carrying a vertical linear measuring scale. This arrangement allows a simple and accurately readable m~asurement of the vertical contact wire position during the installation of the overhead line, the transverse displaceability of the holding element permitting adaptation to the zig-zag course of the con-tact wirè.
The measuring device preferably further comprises an electronic displacement pickup arranged preferably insulated between the measuring yoke and the monitoring frame. This enables the vertical position of the contact wire to be electronically measured during the continuous advance of the machine along the track, and the electronically measured data may be transmitted to a terminal for processing by an operator. The pickup may be a rotary potentiometer.
The undercarriage wheels are preferably flanged wheels engaging the tr~ck rails and i~ a transmission is connected to the wheel axle between the flanged wheels, the monitoring frame is arranged batween the flanged wheels and the lower monitoring frame end is connected to the transmission according to another preferred embodiment. This arrangement is simple and space-saving, the monitoring frame being concentrated in a small area so that it may be centered between the flanged wheels in tha transverse direction immediately adjacent a protective wall of the machine frame superstructure. Since the monitoring frame is mounted on the transmission on the wheel axle, an accurate vertical measurement between the track rail running faces and the contact wire may be obtained. Any influence on the measurement results of unavoidable slight rotary movements of ~J~32~
the transmission ~t the start of the machine ~dvance and at the brakin~ of the advance will be avoided if the lower monitoring frame end i3 connected to a æhaft mounted on the transmission and extending in a direction transverse to the track, the lower monitoring frame end being connected to the shaft.
According to another preferred feature, the measuring device comprises a measuring beam extending in a direction transverse to the tracX and parallel to the wheel axle, and a vertical adjustment drive interconnects the lower and upper monitoring frame ends for vertically adjusting the upper monitoring frame end relative to the lower monitoring frame end. This enables a rapid displacement of the measuring beam from a rest po~ition into an operating position in engagement with the contact wire. The measuring beam has a longitudinally extending upper edge, and the measuring device may further comprise a measuring ledge vertically spaced from, and extending parallel to, the upper measuring beam edge, a pivot extending parallel to the wheel axle in a direction transverse to the track, the pivot pivotally supporting the measuring ledge on the measuring beam for pivot;.ng thereabout, the measuring ledge having a longitudinally extending upper edge for engagement with the contact wire, and a coil spring connected to the measuring ledye ~or biasing the upper measuring ledge edge away from the upper measuring beam edge.
In this way, any errors in the vertical po~ition of the contact wire engaged by the measuring ledge may be immediately detected by monitoring changes in the distance between the upper edges of the measuring beam and pivotal measuring ledge.
Such vertical position errors may be accurately and continuously detected by a displacement pickup affixed to the adjustment drive and connected to the upper measuring ledge edge.
'~ ~? ~
Preferably and lf the adju~tment drive is hydraulically operated and comprises a hydraulic valve controlling the operation of the drive, a limit switch is arranged between the measuring be~m and the measuring ledge, and the limit switch is connected to the hydraulic valve and controls the operation thereof. This assures a steady pres~ure of the pivotal and spring-biased measuring ledge against the contact wire in dependence on any erroneous vertical position thereo~ so that this position may always be monitored at the regular contact pressure of the electric conductor engaging the contact wire during train operations.
If the adjustment drive is hydraulically operated and comprises a vertical cylinder having a longitudinal axis, at least one guide rod extending parallel to the drive cylinder and a guide block affixed to the drive cylinder are preferably provided, the guide rod or rods being vertically adjustably guided in the guide block. Thi~ will prevent the measuring beam from being turned so that it will remain in the correct transverse position in every vertical position.
The actual vertical position of the contact wire may be read at all times if a measuring ledge extending vertically to the wheel axle is connected to the measuring beam and carries a vertical linear measuring scale.
According to yet another preferred feature, the machine frame comprises two parallel guide ledges extending in a direction transverse to the track, the guide ledges defining an opening through which the lower monitoring frame end passes and the lower monitoring frame end being guided by the guide ledges without play, the opening have a greater width extending in the transverse direction than the corresponding width of the lower monitoring frame end. This enables the monitoring frame to move transversely relative to the machine 27~.~
frame in accordance with the track position and indepPndently of vibrat.i.ng machine frame.
In accordance with a furt:her embodiment, flanged wheels are mounted on the lower monitoring frame end for engaging the running faces of the track rails. This enables the lower monitoring frame end to be di~posed at a fixed distance from the running plane under various undercarriaye structures.
BRIEF rDESCRIPTION OF _THE ORAWING
The above and other objects, advantayes and features of the present invention wi].l become more apparent from the following detailed description of certain now preferred embodiments thereof, ta]cen in conjunction with the somewhat diagrammatic accompanying drawing wherein FIG. 1 is a fragmentary perspective view showing one embodiment of the machine of this invention;
FIG. 2 is a side elevational view of the measuring yoke of the machine of FIG. 1;
FIG. 3 is a fragmentary side elevation view showing another embodiment of a support for the lower monitoring frame end;
FIG. 4 is a fragmentary side elevational view showing another embodiment of the measuring yoke;
FIG. 5 is a side elevational view showing another embodiment of the machine of the invention;
PIG. 6 is an enlarged end view, partly in section, of the monitoring frame of the machine of FIG. 5, seen in the 2 ~
directi~n of arrow VI therein;
FIG. 7 is an enlarged end view of the measuring beam and ledge of this monitoring frame;
FIG. 8 is a side elevational view of the measuring beam and ledge of FIG. 7; and , ~
FIGS. 9 and 10 are schematic end v.iews of further embodiments.
DETAILED DESCRIP?ION OF PREFERRED EMBOD~
Referr.ing now to the drawing and first to FIGS. 1 and 2, there is shown schematically indicated machine 1 for monitoring the vertical position of contact wire 18 of overhead line lg extendlng ahove trac]c 4 comprising two rails having running faces defining a plane. The machine comprises self propelled machine frame 2 including superskructure 14 aonstituted by a car box. Undercarriaga 3 supports machine frame 2 on the track and has wheels journaled on a wheel axle and engaging the running faces of the track rails. Vertically adjustable measuring yoke 28 is mounted on machine frame 2, i.e. on its superstructure in the illustrated embodiment.
Fra~e 5 is vertically adjustably mounted on machine frame 2 for monitoring the vertical position of contact wire 18.
The monitoring frame has upper end 13 and device 17 is connected to the upper monitoring frame end for measuring the vertical position of the contact wire, while lower end 8 is held at a fixed distance from the plane defined by the running faces of the track rails.
Undercarriage 3 of machine 1 comprises bearings 11 for the wheel axle, and horizontal support plates 10 are affixed 7 ~ ~
to the bearing~ ~nd extend parallel to the plane defined by th~ trac~ rail running faces, low~r monitoring frame end 8 engaging the support plates. Ag shown, rollers 9 at the lower monitoring frame end engage the support plates. support plates lo have a ~ufficient width to assure eny~gement of roller~ g with the support plates even in sharp track curves when a relative transverse displacement o~ undercarriage 3 and machine ~rame 2 occurs. Monitoring Prame 5 of the embodiment of FIG. 1 comprises two vertically adjustable vertical rods 7, 7 spaced from each other in a direction transverse to track 4, each rod comprising two parts and screw -thread 12 interconnecting the rod parts for adjustment o~ the rod length. This adjustment compensates ~or a reduction in the wheel diameter due to wear, which leads to a corresponding lowering of support plate 10.
As shown, vertical rods 7 pass through superstructure 14 and have upper ends 13 projecting thereabove, and monitoring frame 5 further comprises spacing member 16 extending in a direction transverse to track 4 and respective joints 15 link spacing member 16 to upper rod ends 13. Measuring device 17 is connected to the spacing member. It comprises A-shaped support frame 20 for vertically extending threaded spindle 21 arranged substantially in a central plane o~ track 4 and carrying vertical linear measuring scale 22. The lower end of spindle 21 carries handwheel 23 for turniny the spindle so that the measuring scale may be vertically adjusted relative to monitoring frame 5. Horizontal sliding ledge 24 is connected to an upper end of the threaded spindle and extends in a direction transverse to the track, the sliding edge carrying linear measuring scale 25. Holding element 26 is slidably mounted on sliding edge 24, the holding element carrying vertical linear measuring scale 27.
As shown in FIGS. 1 and 2, vertically adjustable 2~7 ~. ~
mea~uring yoke 2~ is mounted on the roof of car box 14 for engagement with contact wire 18. For measuring the vertical position o~ contact wire 18 while machine l ~dvances along track 4, electronic displacem~sn-t pickup 29 is arranged between measuring yoke 28 and monitoring frame 5. In this monitoring operation, measuring frame 5 provides an absolute.ly dependable and constant reference base for determining the vertical distance of the contact wire Erom the running plane of track 4 because it is mounted directly on undercarriage 3 and thus is not subject to any vibrating motions due to the resilient mounting of machine frame 2 on the undercarriage, khe mounting of the monitoring frame being independent of the machine frame. However, since measuring yoke 28 is af~ixed to the machine frame and any vertical vibratory motion of the machine frame and sup~rstructure is, therefore, detected by displacement pickup 29 and could falsify the measurements of the vertical position of contact wire 18, the pickup is connected to measuring frame 5 by a cable or rope trained over rotatable guide roller 30 affixed to the roof of car box 14 to compensate for any vertical movements of the car box relative to monitoring frame 4.
FIG. 3 schematically illustrates machine 32 for monitoring the vertical position of a contact wire of an overhead line extending above track 35 comprising two rails 34 having running faces defining a plane. The machine comprises self-propelled machine frame 31 and undercarriage 33 supporting machine frame 31 on the track and has wheels journaled on a wheel axle and engaging the running faces of the track rails. Vertical guide rod 36 of monitoring ~rame 37 is vertically adjustably guided in machine frame 31 and its lower end 38 is supported on horizontal support plate 39 in a manner similar to the one described in connection with FIG. 1.
However, support plate 39 is affixed to flanged wheel 40 linked to undercarriage 33 by rod 41. Functionally equivalent -- 10 -- ~
~ 3 to the arrange.ment oP YIG. 1, the support plate provLdes a fixed reference base for the vertical posi-tion measurement of the contact wire.
In the embodiment of FIG. 4, vertically adjustable measuring y~ke 42 on machine 43 is mounted on the roo~ of car box 46 for controlling contact wire 44 of overh~ad line 45.
Monitoring frame 47 is vertically adjustably mounted on machine frame 48 of machine ~3, and measuring device ~9 connected to the upper end of the monitoring frame comprises a displacement pickup in the form o~ potentiometer 50 arranged between monitoring frame 47 and measuring yoke ~2. Electrical insulation 51 is arranged between potentiometer 50 and the measuring yoke.
The machine of the present invention may be used in the installation of a n~w overhead line ~or operation of electric trains or in the maintanance, servicing and repair of the contact wire of an existing overhead line, on the one hand, and for monitoring the vertical position of an overhead line in use during the continuous advance of the machine along the track, on the other hand. In the first case, the measuring scales on measuriny device frame 20 are used while the machine stands still, and the measures are used by the installing or maintenance personnel to mount or re-arrange contact wire 18 in the correct vertical position. In the second case, the measuring scales are not used and measuring yoke 28 is utilized for monitoring the vertical position of the contact wire while an operator on machine 1 may also visually monitor the zig-zag course of contact wire 18 by means of markings on the measuring yoke.
Various means (not illustrated~ may be used for measuring the vertical position o~ the contact wire, such as optical eye arrangements and other opto-electronic means as well as ~r,~ J
inductive proximity fuses for detectiny the position o~ the , contact wire without phys.ic~l contact therewith.
FIG. 5 illustrates anoth~r embodiment therain machine 52 has undercarriages 53 with flanged wheels 68 en~aging track rails 58 of track 59. The machine further comprises machine frame 54 carrying superstructure 55 on which vertically displaceable and rotatable work platform 56 is mounted.
Machine 52 is propelled along the track by drive 57. Power is transmitted from drive 57 to flanged wheels 68 by transmission 62 connected to wheel axle 67 between the flanged wheels, and monitoring frame 60 is arranged centrally between the flanged wheels imm~diately adjacent an end wall of superstructure 55 outside this superstructure. Lower monitoring ~rame end 61 is connected to transmission 62 on wheel axle 67. Upper end 63 of monitoring frame 60 is connected to a measuring device ~or monitoring the vertical position of contact wire 66, and this measu~ing device comprises measuring beam 64 extending in a direction transverse to track 59 and parallel to wheel axle 67. Vertical adjustment drive 65 interconnects lower and upper monitoring frame ends 61, 63 for vertically adjusting upper monitoring frame end 63 relative to lower monitoring frame end 61. Rotatable shaft 69 is mounted on transmission gear box 62 and extends in a direction transverse to track 59, and lower monitoring frame end 61 is connected to the shaft so that the monitoring frame may rotate relative to the wheel shaft.
As shown in FIGS. 6 and 7, measuring frame 60 comprises vertical carrier rod 70. Adjustment drive 65 is hydraulically operated and comprises vertical cylinder 72 concentric with the carrier rod and having longitudinal axis 71 extending perpendicularly relat.ive to wheel axle 67, and piston rod 73 connected to measuring beam 64. Guide rods 74 extend parallel to drive cylinder 72 and guide block 75 is affixed to the r7~ ~
drive cylinder, the guide rods beiny vertically adjustably guided in the guide block.
Measuring beam 64 has longitudinally extending upper edge 77, and the measuring device further comprises measuring ledge 76 vertically spaced ~rom, and extending parallel to, upper measuring ~eam edge 77. Pivot 78 extending parallel to wheel axle 67 in a direction transversa to the track pivotally supports measuring ledge 76 on measuriny beam 64 for pivoting thereabout, the measuring ledge having longitudinally extending upper edge 80 for engagement with contact wire 66.
Coil spring 79 is anchored on measuring beams 64 and connected to measuring ledge 76 for biasing upper measuring ledge edge 80 away ~rom upper measuring beam edge 77. Displacement pickup 81, illustrated as a rotary potentiometer, is affixed to adjustment drive 65 by a bracket on drive cylinder 72 and is connected to upper measuring ledge edge 80 by cable or rope 82 extending parallel to longitudinal axis 71 of the drive cylinder. As shown in FIGS. 7 and 8, limit switch 83 is arranged between measuring beam 64 and measuring ledge 76, and hydraulically operated adjustment drive 65 comprises hydraulic valve 84 controlling the operation of the drive.
Limit switch 83 is connected to hydraulic valve 84 and controls the operation thereof. Furthermore, another measuring ledge 88 is connected to measuring beam 64 and extends vertically to wheel axle 67, measuring ledgs 88 carrying a vertical linear measuring scale.
As shown in FIG. 6, machine frame 54 comprises two parallel yuide ledges 86 extending in a direction transverse to track 59 and defining opening 85 through which lower monitoring frame end 61 passes and is guided by guide ledges 86 without play. Opening 85 has a greater width extending in the transverse direction than the corresponding width of the lower monitoring frame end. A similar guide for the ~3~3~
mon:Ltorlng frame is .shown a-t B7 at the top o~ superstructure 55, such a gllide hracket beirlg illustr~ted in FIG. 5 affixed to the end wall of the superstructure.
To monitor the vertical position o~ contact wire 66, monitoring frame 60 is vertically adjusted by drive 65 until measuring ledge 76 engages the contact wire. Limit switch 83 and the bias o~ coil spring 79 are so coordinated that the limit switch will actuate hydraulic valve 84 for interrupting the operation of adjustment drive 65 when the coil spring exerts the desired contact pressure on the measuring ledge for engaging the contact wire, for example 1 kp. In thi.s position of measuring ledge 76, the actual distance of contact wire 66 engaged by upper measuring ledge edge 80 from the running plane defined by the running faces of track rails 58 may be readily read from the measuring scale on vertical measuring ledge 88. Displacement pickup 81 at the same time converts the vertical measurement into electrical signals which may be converted into digital read-outs, if desired.
As machine 52 is advanced continuously along track 59, any deviation of the vertical position of contact wire 66 engaged under pressure by measuring ledge 76 will cause the measuring ledge to be pivoted about pivot axle 78, and limit switch 83 will actuate hydraulic valve 84 to operate adjustment drive 65 for vertical adjustment of monitoring frame 60 until the above-described coordination between the limits switch and the coil spring bias will cause the actuation of the adjustment drive to be halted again. In this way, the distance bet.ween measuring beam 64 and contact wire 66 remains essentially constant during the antire monitoring operation. The described change in the vertical position of the measuring beam relative to displacement pickup 81 and the track running plane when the measuring ledge detects a deviation in the vertical position of the contact wire is ~, ~3 ~ L &
recorded by the pickup. This constant and automatic control of the vertical position of measuring be~m 64 and the position of measuring ledge 76 relative thereto has the ad~antage that, regardless of any detected deviations of the vertical position of contact wire 66, the same contact pressure o~ the measuring ledge against the contact wire is assured. In this way, the monitoring of the vertical oontact wire position by machine 52 is always e~fected under the same conditions pr~vailing when a trolley arm of an electric loc:omotive engages the contact wire.
FIG. 9 schematically illustra-ked an embodiment of a machine including machine frame 92, which is quite similar to that described hereinabove in connection with FIGS. 5 to 8.
In this embodiment, the lower end of monitoring frame 89 (which is quite similar to monitorin~ frame 60) is supported on flanged wheels gO for engayiny the running faces of track rails 91, i.e. directly on the track rather than on the wheel axle.
The similar illustration of FIG. lo shows the lower ends of monitoring frame g3 supported on journal boxes 94 of undercarriage 95 of the machine.
- 15 ~
Claims (20)
1. A machine for monitoring the vertical position of a contact wire of an overhead line extending above a track comprising two rails having running faces defining a plane, which comprises (a) a self-propelled machine frame including a superstructure, (b) an undercarriage supporting the machine frame on the track and having wheels journaled on a wheel axle and engaging the running faces of the track rails, (c) a vertically adjustable measuring yoke mounted on the machine frame, and (d) a frame vertically adjustably mounted on the machine frame for monitoring the vertical position of the contact wire, the monitoring frame having an upper end and a device connected to the upper monitoring frame end for measuring the vertical position of the contact wire, and a lower end at a fixed distance from the plane.
2. The machine of claim 1, wherein the lower monitoring frame end engages the wheel axle.
3. The machine of claim 1, wherein the lower monitoring frame end engages the plane defined by the track rail running faces.
4. The machine of claim 1, wherein the undercarriage comprises a bearing for the wheel axle, and further comprising a horizontal support plate affixed to the bearing and extending parallel to the plane defined by the track rail running faces, the lower monitoring frame end engaging the support plate.
5. The machine of claim 4, further comprising roller means at the lower monitoring frame end, the roller means engaging the support plate.
6. The machine of claim 1, wherein the monitoring frame comprises two vertically adjustable vertical rods spaced from each other in a direction transverse to the track, each rod comprising two parts and a screw thread interconnecting the rod parts for vertical adjustment thereof.
7. The machine of claim 6, wherein the vertical rods pass through the superstructure and have upper ends projecting thereabove, and the monitoring frame further comprises a spacing member extending in a direction transverse to the track and respective joints linking the spacing member to the upper rod ends, the measuring device being connected to the spacing member.
8. The machine of claim 7, wherein the measuring device comprises a vertically extending threaded spindle carrying a vertical linear measuring scale, a handwheel for turning the spindle, a horizontal sliding ledge connected to the threaded spindle and extending in a direction transverse to the track, the sliding edge carrying a linear measuring scale, and a holding element slidably mounted on the sliding edge, the holding element carrying a vertical linear measuring scale.
9. The machine of claim 1, wherein the measuring device further comprises an electronic displacement pickup arranged between the measuring yoke and the monitoring frame.
10. The machine of claim 9, wherein the pickup is a rotary potentiometer.
11. The machine of claim of 1, wherein the undercarriage wheels are flanged wheels engaging the track rails, further comprising a transmission connected to the wheel axle between the flanged wheels, the monitoring frame being arranged between the flanged wheels and the lower monitoring frame end being connected to the transmission.
12. The machine of claim 11, further comprising a shaft mounted on the transmission and extending in a direction transverse to the track, the lower monitoring frame end being connected to the shaft.
13. The machine of claim 1, wherein the measuring device comprises a measuring beam extending in a direction transverse to the track and parallel to the wheel axle, and further comprising a vertical adjustment drive interconnecting the lower and upper monitoring frame ends for vertically adjusting the upper monitoring frame end relative to the lower monitoring frame end.
14. The machine of claim 13, wherein the measuring beam has a longitudinally extending upper edge, and the measuring device further comprises a measuring ledge vertically spaced from, and extending parallel to, the upper measuring beam edge, a pivot extending parallel to the wheel axle in a direction transverse to the track, the pivot pivotally supporting the measuring ledge on the measuring beam for pivoting thereabout, the measuring ledge having a longitudinally extending upper edge for engagement with the contact wire, and a coil spring connected to the measuring ledge for biasing the upper measuring ledge edge away from the upper measuring beam edge.
15. The machine of claim 14, further comprising a displacement pickup affixed to the adjustment drive and connected to the upper measuring ledge edge.
16. The machine of claim 14, further comprising a limit switch arranged between the measuring beam and the measuring ledge, the adjustment drive being hydraulically operated and comprising a hydraulic valve controlling the operation of the drive, and the limit switch being connected to the hydraulic valve and controlling the operation thereof.
17. The machine of claim 13, wherein the adjustment drive is hydraulically operated and comprises a vertical cylinder having a longitudinal axis, and further comprising at least one guide rod extending parallel to the drive cylinder and a guide block affixed to the drive cylinder, the guide rod or rods being vertically adjustably guided in the guide block.
18. The machine of claim 13, further comprising a measuring ledge connected to the measuring beam and extending vertically to the wheel axle, the measuring ledge carrying a vertical linear measuring scale.
19. The machine of claim 1, wherein the machine frame comprises two parallel guide ledges extending in a direction transverse to the track, the guide ledges defining an opening through which the lower monitoring frame end passes and the lower monitoring frame end being guided by the guide ledges without play, the opening have a greater width extending in the transverse direction than the corresponding width of the lower monitoring frame end.
20. The machine frame of claim 1, further comprising flanged wheels on the lower monitoring frame end for engaging the running faces of the track rails.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT199690A AT394687B (en) | 1990-10-03 | 1990-10-03 | Machine for monitoring the contact wire of an overhead line |
| ATA1996/90 | 1990-10-03 | ||
| ATA436/91 | 1991-03-01 | ||
| AT0043691A AT395490B (en) | 1991-03-01 | 1991-03-01 | POCKET DICTATOR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2052716A1 true CA2052716A1 (en) | 1992-04-04 |
Family
ID=25592738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2052716 Abandoned CA2052716A1 (en) | 1990-10-03 | 1991-10-03 | Machine for monitoring the vertical position of a contact wire of an overhead line |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2052716A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108909543A (en) * | 2018-08-14 | 2018-11-30 | 赵忠鹏 | A kind of section insulator inspection tune tool |
| CN117353466A (en) * | 2023-12-06 | 2024-01-05 | 天津大学 | Distribution network power equipment fault detection device and detection method based on image recognition |
-
1991
- 1991-10-03 CA CA 2052716 patent/CA2052716A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108909543A (en) * | 2018-08-14 | 2018-11-30 | 赵忠鹏 | A kind of section insulator inspection tune tool |
| CN108909543B (en) * | 2018-08-14 | 2024-03-22 | 赵忠鹏 | Segment insulator examines and transfers instrument |
| CN117353466A (en) * | 2023-12-06 | 2024-01-05 | 天津大学 | Distribution network power equipment fault detection device and detection method based on image recognition |
| CN117353466B (en) * | 2023-12-06 | 2024-03-12 | 天津大学 | Distribution network power equipment fault detection device and detection method based on image recognition |
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