GB2604846A

GB2604846A - A device for measuring overhead line equipment

Info

Publication number: GB2604846A
Application number: GB2018310.9A
Authority: GB
Inventors: Reddall Ian; Andrew Walker Gary
Original assignee: Hastec Rail Ltd
Current assignee: Hastec Rail Ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2022-09-21
Anticipated expiration: 2040-11-20
Also published as: GB2604846B; GB202018310D0

Abstract

A device for measuring the thickness of a live contact wire, such as those used in overhead line equipment (OLE) for electric trains. The device 300 includes a first arm 304 having a first hook 302 for hooking the contact wire. A second hook 303 hooks over a catenary wire and is mounted on a second arm 305. A laser rangefinder 307 is mounted on the arm at a position of a known distance/displacement from the first hook 302. The laser rangefinder measures the distance from an object located at the first hook 302 to a second object located proximal to the second hook 303. The measured distance is used calculate the diameter of the contact wire from which the thickness is derived. The measured diameter may be compared to an expected value to calculate total wear of the wire. The second arm 305 may be slidably attached to the first arm 304. Preferably, the device is mounted 301 on an electrically insulated non-conductive pole to be held by an operator. Ideally, the device transmits the thickness measurements to a remote / portable electronic computing device 309 held by the operator.

Description

A DEVICE FOR MEASURING OVERHEAD LINE EQUIPMENT

Field of the Invention

[0001] The present invention relates to a measurement device, particularly although not exclusively for measuring overhead line equipment

Background of the Invention

[0002] There is an increasing demand for electric trains, due to the operational and environmental benefits of trains powered by electricity as opposed to traditional diesel in ins. Railway electrification systems supply electric power to trains. There are several known railway electrification systems, currently the most popular is overhead line equipment [0003] Overhead line equipment (OLE) comprises a number of overhead wires suspended above a track by a plurality of masts and gantries. Electricity is transmitted from feeder substations to the OLE at 25,000 volts, the overhead wire which carries the voltage is called the contact wire. The power is transmitted from the contact wire to an electric train via a pantograph, a device mounted on the roof of the train. The pantograph conducts the electricity down to the train from the contact wire and into the electric motor which then drives the train' s wheels. The electicity returns through the track, completing the circuit and allowing a constant flow of current [0004] The purpose of the OLE is to provide an uninterrupted, uniform, reliable and safe power supply to trains. In order for this to happen the contact wire must remain in constant contact with the trains pantograph. Therefore, the geometry of the OLE is pivotal to the operation of electric trains.

[0005] Referring to Figure 1 herein, there is illustrated schematically one example of a known overhead line equipment 100, comprising an assembly of wires suspended above a rail track by a supporting infrastructure. The overhead line equipment 100 comprises masts 101; a contact wire 102; a catenary wire 103; dropper wires 104; a cantilever 105; insulators 106; registration arm 107. The masts 101 are located to the side of the rail track, they are attached to the cantilever 105 by insulators 106 to separate the electrically live elements of the OLE. The cantilever 105 supports the catenary wire 103 which in turn supports the contact wire 102 by dropper wires 104 located between the catenary and contact wire at regular intervals. There is a registration arm 107 which fixes the horizontal position of the contact wire 102.

[0006] In variations of the known overhead line equipment there may also be portals or headspans above the track for additional support of the assembly of wires. Supporting structures may also be attached to the underside of a bridge or tunnel where there are space restrictions.

[0007] The contact wires positioning is carefully calculated and maintained to ensure constant contact with the pantographs of the electric trains. All elements of the overhead line equipment are arranged to position the contact wire within a certain geometry.

[0008] To help keep the contact wire in position it is supported by a second wire known as the catenary wire. Both the catenary wire and contact wire are tensioned, either at one end of the wires or at both ends of the wires, to ensure minimal disruption to the positioning of both the contact wire and catenary wire on high speed lines and during unpredictable weather conditions.

[0009] The catenary system of the OLE can either be simple or compound.

A simple catenary system is where one catenary wire is used to support the contact wire. The simple catenary system has variations including the use of additional stitch wires or presagged contact wires.

[0010] Referring to Figure 2 herein, there is illustrated schematically one example of a known compound catenary system 200. A first catenary wire 201 supports a second catenary wire 202 which then supports the contact wire 203. A compound catenary system is complex and has higher maintenance requirements than a simple catenary system. The distance between the contact wire and the catenary wire or wires must be measured for installation and then regularly checked during maintenance.

[0011] The catenary wire and contact wire are connected by dropper wires.

The main purpose of the dropper wires is to hold the contact wire in the correct position and to withstand the loading and unloading cycle created by the passage of electric trains. Droppers can either be current carrying or non-current carrying. The length of the droppers is essential for the performance of the OLE.

[0012] The cantilever sets the vertical positioning of the catenary wire, which then supports the vertical positioning of the contact wire, which is critical to ensure constant contact between the contact wire and the pantograph attached to the roof of the electric train without adding additional pressure and causing excessive wear.

[0013] The registration arm creates the stagger of the contact wire. The stagger is the zig zag of the contact wire which is used to create even wear and avoid a groove being wom into the pantograph.

[0014] As well as maintained contact with the pantograph ensuring a constant power supply to electric trains, the contact wire and all other live equipment must be kept a safe distance from other structures, such as the cantilever and bridges. The height of the contact wire varies between defined limits along the rail track and it is important that there is sufficient distance between the live components of the overhead line equipment and any earthed component To ensure this distance, additional measurements need to be made when installing OLE inside a bridge or tunnel, such as the distance from the contact wire to the bridge itself.

[0015] Live equipment must also be kept at a sufficient distance from any publicly accessible area such as on bridged and platforms for safety purposes. There is a minimum clearance required in public areas to reduce the risk of people coming into contact with the 25,000 volts in the overhead line equipment This affects the positioning of the contact wire a near bridges, tunnels and at stations.

[0016] During installation and maintenance of overhead line equipment the following measurements will need to be taken: a System heights of OLE simple and compound; a the length of dropper wires; a discrete clearances -such as DEP spigot separation; a measurement of clearances from OLE to ancillary conductors; e. live equipment to earth, such as OLE portal structures, cantilevers and bridges; [0017] The above measurements can be automated or taken manually.

[0018] For known methods of manual measurements, the OLE cannot be live. A line stop is put in place to isolate sections of the track so that workers can be in close proximity to the OLE without the risk of electrocution. For some of the measurements, mobile elevating work platforms, such as cherry pickers, are used to give workers access to the wires suspended above the rail track.

[0019] One known apparatus used for taking manual measurements is a measurement stick. The measurement stick is a beam made of a rigid material, usually wood, with a scale either printed or etched on. The measurement stick is placed alongside two components and the distance between them can be read off the scale on the measurement slick.

[0020] The measurements are written down on paper by a human operative to be entered into a computer electronically at a later stage.

[0021] Automated measurements are taken by measuring vehicle. The measuring vehicle comprises a vehicle for use on a railway and a measuring device attached to the roof of said measuring vehicle. The measuring device comprises stereoscopic cameras mounted on the roof of a vehicle which travels along the rail track, optical analysis can be performed on the images taken by the cameras to determine the position of the overhead line equipment

S

[0022] In variations of the known measuring vehicle, other optical systems are mounted to the roof of the vehicle for measuring the thickness of the contact wire.

[0023] All current manual methods require the power supply to the overhead line equipment in the section of railway to be cut off, and line stops to be put in place to isolate sections of the track which require inspection. To minimize disruption to the daily train service, measurements are predominantly taken at night [0024] The measurements are read from a scale, and at night these would have to be illuminated by additional means. When using a micrometer, the worker would have to hold the micrometer in place whilst simultaneously tightening the calibrated screw. Once in position, the scale on the micrometer would have to be illuminated, read and recorded. This method would likely require two workers, increasing the expense of the operation.

[0025] Transcription errors are extremely likely to occur between a human operator reading the measurement and recording those on a paper chart, and then entering the manually recorded measurements into a computer for sending to an engineering department. Especially considering that the majority of measurements are recorded at night in poor weather or at other times when there is restricted visibility.

[0026] Additional access equipment is also needed to give workers access to the contact wires which are positioned around 6 meters above the rails. This is costly, and slows down the operation.

[0027] Automated measurement methods are also problematic. Any use of an electric train or other electrically powered rail vehicle in use can cause movement in contact wire giving inaccurate measurements. The pantograph of the train will push upwards on the contact wire causing disruption to its positioning even at low speeds.

[0028] The automated measurement methods do not account for lateral train movement. Lateral movement is common in high speed trains, it is also common in exposed areas of Wack susceptible to strong winds.

Summary of the Invention

[0029] According to a first aspect there of the present invention, there is provided a measurement device for measuring physical parameters of a railway, said device comprising: a first arm; a first hook located on said first arm; a laser rangefinder; and means for holding said laser rangefinder in a known spatial relation to said first hook.

[0030] Preferably said first arm comprises a hollow portion, such that a laser beam projected by said laser rangefinder is not obstructed by said arm.

[0031] Preferably the device further comprises an adapter for connecting said measurement device to a pole; and wherein said arm is rotatable in relation to said adapter.

[0032] Preferably the device further comprises a tilting joing located between said arm and said adapter.

[0033] Preferably said first arm is located between said first hook and said laser rangefinder.

[0034] Preferably said first arm is hollow, such that a laser beam projected by said laser rangefinder is not obstructed by said arm.

[0035] The device may further comprise: a second elongate arm; a second hook located at one end of said second arm.

[0036] Preferably said second hook comprises; an under surface at a first end; wherein said undersurface at a first end is perpendicular to said laser range finder.

[0037] Preferably the device further comprises a sliding means; wherein said second arm is slidably attached to said first arm by said sliding means.

[0038] Preferably said sliding means comprises; a plurality of rollers; a plurality of roller pins; wherein said plurality of rollers rotate around said plurality of roller pins.

[0039] Preferably said plurality of rollers are placed at either side of said second elongate arm.

[0040] Preferably said device further comprises a twist and lock mechanism; wherein said second hook is attached to said second elongate arm by said twist and lock mechanism; and wherein said second hook can be rotated such that a laser beam projected by said laser rangefinder is not obstructed by said second hook.

[0041] Preferably said laser rangefinder further comprises means for communicating with a remote computing device; and wherein said remote computing device comprises means for controlling said laser rangefinder and receiving measurements taken by said laser rangefinder.

[0042] Preferably the device further comprises an adapter for connecting said measurement device to a pole.

[0043] Preferably the device comprises a nonconductive polymer.

[0044] Preferably the device weighs 4kg or less.

[0045] According to a second aspect there is provided a method of determining the distance from an overhead contact wire, said method comprising: from a position below said contact wire, raising an electrically nonconductive pole adjacent said contact wire; said pole having at a distal end, a first arm; and a first hook located on said first arm; holding a laser rangefinder in a known spatial relationship to said first hook; engaging said first hook with said overhead contact wire; and using said laser rangefinder to capture a distance measurement between said laser rangefinderand an object [0046] Preferably said method includes a laser beam generated by said laser rangefinder device is aimed at the overhead line equipment [0047] Preferably said method further comprises; a second hook; engaging said second hook with a catenary wire; and using said laser rangefinder to capture a distance measurement between said laser rangefinder and said second hook.

[0048] Preferably said method is carried out when said contact wire is electrically live.

[0049] Said pole may be manually held by a human operative.

[0050] Preferably said method further comprises wirelessly transmitting a set of one or more distance measurement between said laser rangefinder and a remote computing device.

[0051] The technical features and process stages as set out in the claims herein, and the full content the herein are incorporated into this summary of invention by reference.

Brief Description of the Drawings

[0052] For a better understanding of the invention and to show how the same may be carried into effect there will now be described by way of example only, specific embodiments, methods and processes according to the present invention with reference to the accompanying drawings in which: Figure 1 herein illustrates schematically an overview of a prior art overhead line equipment comprising a contact wire positioned over a track by a catenary wire supported by a cantilever attached to a mast Figure 2 herein illustrates schematically a prior art compound catenary system comprising a first catenary wire supporting a second catenary wire which then supports a contact wire; Figure 3 herein illustrates schematically a novel measurement apparatus according to a specific embodiment of the present invention; Figure 4 herein illustrates schematically main components of the measuring apparatus of Figure 3 in exploded view; Figure 5 herein illustrates schematically the front plate of the first elongate arm of the measuring apparatus; Figure 6 herein illustrates schematically the back plate of the first elongate arm of the measuring apparatus; Figure 7 herein illustrates schematically a first hook of the measuring apparatus; Figure 8 herein illustrates schematically the side plate of the first elongate a n-n; Figure 9a herein illustrates schematically the end plate of the first elongate arm in a first view; Figure 9b herein illustrates schematically the end plate of the first elongate arm in a second view; Figure 10 herein illustrates schematically the adapter of the measuring device; Figure 11 herein illustrates schematically the laser rangefinder housing; Figure 12 herein illustrates schematically the top plate of the first elongate arm of the measuring device; Figure 13a herein illustrates schematically a side view of a first roller of the sliding mechanism; Figure 13b herein illustrates schematically a front view of a first roller of the sliding mechanism; Figure 14 herein illustrates schematically a first roller pin of the sliding mechanism; Figure 15a herein illustrates schematically a front view of a second roller of the sliding mechanism; Figure 15b herein illustrates schematically a side view of a second roller of the sliding mechanism; Figure 16 herein illustrates schematically a second roller pin of the sliding mechanism; Figure 17 herein illustrates schematically the main body of the second elongate arm of the measuring device; Figure 18 herein illustrates schematically the end stop of the second elongate arm; Figure 19 herein illustrates schematically a twist and lock mechanism; Figure 20 herein illustrates schematically a second hook of the measuring device; Figure 21a herein illustrates schematically a side view of the second end of the second elongate arm; Figure 21b herein illustrates schematically a front view of the second end of the second elongate arm; Figure 22 herein illustrates schematically a novel measurement apparatus according to a second aspect of the present invention; [0053] Figure 23 herein illustrates schematically the measuring apparatus of Figure 22 in exploded view; [0054] Figure 24 herein illustrates schematically the arm 2201 of the measuring device in a front view.

[0055] Figure 25 herein illustrates schematically the arm 2201 of the measuring device in a cutaway side view.

[0056] Figure 26 herein illustrates schematically the back panel 2305 of the measuring device in a perspective view.

[0057] Figure 27 herein illustrates schematically the tilting mechanism 2301 and the adapter 301 of the measuring device.

[0058] Figure 28a herein illustrates schematically a joint half 2702 and 2703 of the tilting mechanism of the measuring device in a cross-sectional view.

[0059] Figure 28b herein illustrates schematically a joint half of the tilting mechanism of the measuring device in a front view.

Detailed Description of the Embodiments

[0060] There will now be described by way of example a specific mode contemplated by the inventors. In the following description numerous specific details are set forth in order to provide a thorough understanding. It will be apparent however, to one skilled in the art, that the present invention may be practiced without limitation to these specific details. In other instances, well known methods and structures have not been described in detail so as not to unnecessarily obscure the description.

[0061] In the specification, like reference numerals used across different Figures denote like components.

[0062] In this specification, the term laser measuring device_ or laser measuring instrument_ includes electronic devices which generate a laser beam and which measure a distance through reflection of a laser beam from the surface of an object It includes known laser measuring devices, and where appropriate, their mounting gimbals.

Overview of measuring apparatus [0063] Referring to Figure 3 herein there is illustrated schematically a measuring apparatus 300, suitable for taking measurements of overhead line equipment specifically for measuring system heights of OLE simple and compound, the length of dropper wires, discrete clearances -such as DEP spigot separation, live equipment to earth. The measuring apparatus comprises a first elongate arm 304 having at a proximal end an adapter 301 for connecting the end of the elongate arm 304 to an electrically nonconductive pole; and a first hook portion 302 for engaging over an overhead contact wire located at said proximal end; a second hook 303 located at one end of a second elongate arm 305. The measuring apparatus is shown in situ, connected to a standard nonconductive pole by way of an adapter 301 and with a first hook 302 placed over a contact wire and a second hook 303 placed over a catenary wire.

[0064] The measuring apparatus 300 comprises a first elongate arm 304 and a second elongate arm 305. At a first end of the first elongate arm 304 is a hook 302 and at a first end of the second elongate arm is a second hook 303. The first hook is placed over the contact wire and gives the necessary stability for precise measurements of the overhead line equipment to be taken. The second hook can be placed over the catenary wire or any other appropriate object which would need to be measured in relation to the contact wire. There is provided two sliding mechanisms 306 located at the upper end and the lower end of the first elongate arm for slidably attaching the second elongate arm 305 to the first elongate arm 304. Located at the lower end of the first elongate arm and preferable integrated therein, is a laser rangefinder electronic measuring device 307 held in place by a laser rangefinder housing 308. The laser rangefinder is capable of measuring distance from an object located at the first hook to a second object either located at the second hook or otherwise using a known technology, for example optical time domain reflectometry (OT DR).

[0065] In the best mode embodiment the laser rangefinder comprises a transceiver for wireless communication within wireless range of a nearby portable computing device 309, for example a tablet computing device which is also fitted with a wireless transceiver for communicating with the laser rangefinder 307. In the best most the handheld computing device has a camera for documenting the surrounding area and a touch sensitive screen capable of receiving user instructions through touching icons or areas of the touch sensitive screen, as in known in the art.

[0066] Both the elongate arms are manufactured from a nonconductive polymer, such as nylon or the like. The apparatus has an electrical appliance Class It or double insulated status and had been tested up to 50,000 volts, double that carried by the standard contact wire. The first elongate arm is preferably larger in width that said second elongate arm and the second elongate arm is preferable longer in length than said first elongate arm. The first elongate arm provides stability for reliable measurements to be taken. The second elongate arm is slidably attached to the first elongate arm providing a variable distance between said first and second hooks.

[0067] Referring to Figure 4 herein there is illustrated schematically main component sub-assemblies of the measuring apparatus of Figure 3 in exploded view, including an adapter 301, a first hook 302, a second hook 303, a first elongate arm 304, a second elongate arm 305, sliding mechanisms 306, laser rangefinder 307 and laser rangefinder housing 308. Also shown is a twist and lock mechanism 401 located at the base of the second hook 302 and connected to the top plate 408 of the first elongate arm. The twist and lock mechanism facilitates rotation of the second hook so that the laser beam emitted from the laser rangefinder can reach beyond the second hook enabling the distance from the contact wire to objects that cannot be reached by the second hook to be measured. For example, the distance to the underside of a bridge or other component of the overhead line equipment such as the cantilever.

[0068] The first elongate arm 304 comprises a front plate 402, a back plate 403, a side plate 404 and an end plate 405. The front plate and back plate are attached by the side plate creating a hollow interior. The first elongate arm is hollow such that the laser beam projected by the laser rangefinder is not obstructed by the arm and can reach the base of the second hook, or a ltematively to objects beyond the base of the second hook.

[0069] The second elongate arm 305 comprises a main body 406 slidably attached the first elongate arm by a sliding mechanism, an end stop 407 to prevent the second elongate arm from entirely sliding through the sliding -1 6-mechanism and becoming adjacently displaced from the first elongate arm. The second hook is attached to the main body of the second elongate arm by the twist and lock mechanism.

First elongate arm [0070] Referring to Figure 5 herein, there is illustrated schematically the front plate 402 of the first elongate arm.

[0071] The front plate of the device arm comprises a first end 501, a second end 502 and a narrowing section 503 extending from the first end 501 to the second end 502. The narrowing section 503 further comprises ladder section 504, this increases the strength of the device and prevent bending which would result in inaccurate measurements. The first end 501 further comprises an aperture 505 where the display and functional buttons of the laser rangefinder can be accessed. The first end 501 is rectangular in shape. The narrowing section 503 extends from the first end 501 the width of the section 503 narrows as it extends towards the second end 502 until matching the width of the second end. Nonconductive crews 506 are located around the front plate.

[0072] At a first side of the front plate there is located a first protrusion 507 at a first end of the front plate with a flat underside and a curved upper edge. The first protrusion attaches to the hook by way of three screws located at the outer perimeter of the protrusion. Also located in the first protrusion, to the side of the hook is a first sliding mechanism. At a second end of the first side of the front plate there is located a second protrusion 508 which houses a second sliding mechanism.

[0073] Referring to Figure 6 herein, there is illustrated schematically the back plate 403 of the first elongate arm.

[0074] The back plate of the device arm comprises a first end 601, a second end 602 and a narrowing section 603 extending from the first end 601 to the second end 602. The narrowing section 603 further comprises ladder section 604, as with the front plate. The first end 601 further comprises a rectangular aperture 605 where the back of the laser rangefinder can be accessed to enable battery changes. The first end 601 is rectangular in shape. The narrowing section 603 extends from the first end 601 the width of the section 603 narrows as it extends towards the second end 602 until matching the width of the second end.

Nonconductive screws 506 are located around the back plate.

[0075] At a first side of the back plate there is located a first protrusion 606 at a first end of the back plate with a flat underside and a curved upper edge. The first protrusion attaches to the hook by way of three screws located at the outer perimeter of the protrusion. Also located in the first protrusion to the side of the hook is a first sliding mechanism. At a second end of the first side of the front plate there is located a second protrusion 607 which houses the second sliding mechanism.

[0076] Referring to Figure 7 herein, there is illustrated schematically a first hook 302 of the measuring apparatus.

[0077] The first hook 302 is a hollow cuboid with two apertures 701 for receiving two nonconductive screws. The first hook lies between the first protrusion of the front plate and the first protrusion of the back plate of the first elongate arm and is connected to the same by the nonconductive screws. Altematively, the hook could be curved or have a predominantly L shaped cross section to receive the contact wire.

[0078] Referring to Figure 8 herein, there is illustrated schematically the side plate 404 of the first elongate arm.

[0079] The side plate of the device arm comprises a rectangular plate 801 with an aperture 802 located in the centre of the rectangular plate 901. There are two receptacles 803 and 804 for receiving screws for fixing the side plate between the front plate and the back plate. The side plate 404 increases the stability of the first elongate arm of the measuring device.

[0080] Referring to Figure 9a herein there is illustrated schematically the end plate 409 of the measuring device in a first view.

[0081] At the end of the first elongate arm of the device is an end plate 405 comprising a rectangular end 901 with a first circular aperture 902 located in the centre of the rectangular end and a second circular aperture 903 located to the side of the first aperture 902. At a first end of the rectangular end is a first rectangular side piece 904 with a smaller width than the rectangular end creating a T shaped cross section. At a second end of the rectangular end is a second rectangular side piece 905, again with a smaller width than the rectangular end creating a T shaped cross section.

[0082] In use the end plate 405 is connected to the front plate 403 and back plate 404 by 8 nonconductive screws 501 located in rows of 2 at each side of the front plate 403 and back plate. There is a third screw in each row which connects the front and back plates to the laser rangefinder housing. The first and second rectangular side pieces are positioned below the laser rangefinder housing and provide additional stability.

[0083] Referring to Figure 9b herein there is illustrated schematically the end plate 409 of the measuring device in a second view.

[0084] The second rectangular side piece 905 comprises an aperture 906 located in the centre of the second rectangular side piece. There are two circular apertures 907 located opposite each other at either end of the aperture 906. There are two apertures located at each end of each rectangular side piece 904, 905.

[0085] The aperture 906 is substantially rectangular in shape.

[0086] Referring to Figure 10 herein there is illustrated schematically the adapter 401 of the measuring device.

[0087] The adapter 401 comprises a hollow cylindrical main body 1100 and several circular apertures 1101 located around the main body 1100. The circular apertures are for receiving prongs of a nonconductive pole and securely attaching the device to the pole.

[0088] The adapter is made to fit a standard nonconductive pole. Variations of the adapter may include a screw fitting to connect a screw in nonconductive pole. The adapter is connected to the end plate 409 of the measuring device.

[0089] Referring to Figure 11 there is herein illustrated schematically the laser rangefinder housing.

[0090] In the base of the arm of the device is a laser rangefinder housing comprises a first side part 1101, a second side part 1102, and one end part 1103.

Located at a first end of the first side part and second side part there are protruding rectangular portion 1104 and 1105 which face towards each other to create a narrow opening at the top of the laser rangefinder housing. The end part is located at a second end of the first and second side parts and is connected to the same. The first and second side parts and end part are arranged in a substantially rectangular formation to house a laser rangefinder.

[0091] In use the housing is located between the front plate and the back plate and above the end plate. The housing is held in place by nonconductive screws located in each of the four corners on at the front of the laser housing and the same at the back of the laser housing. The laser is to be housed the with laser emitter pointing through the opening between the end protrusions of the laser housing first and second side parts.

[0092] Referring to Figure 12 there is herein illustrated schematically the top plate 402 of the first elongate arm.

[0093] The top plate of the first elongate arm comprises a substantially L shaped plastic extrusion. A first side 1201 of the top plate has a U-shaped indent 1202 at one end and curves into a second side 1203 at a second end. The U-shaped indent is such that the laser beam emitted from the laser rangefinder passes through the top plate without disruption. The first end also comprises two small circular apertures 1204 at either side of the U-shaped indent 1202 and two small circular apertures 1204 positioned either side of the second end to house non-conductive screws which connect the top plate to the first and second sides of the first elongate arm. The second side of the top plate is longer than the first side and comprises a large substantially rectangular aperture 1203 positioned roughly in the centre of the second side. There are two centrally positioned circular apertures 1205 at either side of the large rectangular aperture, the three apertures on the second side of the top plate collectively hold a roller component of the sliding mechanism.

Sliding mechanism [0094] Referring to Figure 13a there is herein illustrated schematically a side view of a first roller of the sliding mechanism 306.

[0095] The first roller comprises a non-conductive cylinder 1301 with a hollow centre 1302. The hollow centre is for receiving a roller pin and has a smooth surface allowing the first roller to rotate around the roller pin with minimal friction.

[0096] Referring to Figure 13b there is herein illustrated schematically a front view of a first roller of the sliding mechanism 306.

[0097] The outside of the non-conductive cylinder 1303 similarly is smooth for minimal friction with the second elongate arm. The first roller is of a size which allows the roller to fit within the large substantially rectangular aperture 1203 of the top plate and the rectangular aperture 906 of the end plate without the sides of the aperture preventing the first roller from rotating.

[0098] Referring to Figure 14 there is herein illustrated schematically a first roller pin of the sliding mechanism 306.

[0099] The roller pin comprises a solid cylinder 1401 made of non-conductive material such as nylon. The pin has a diameter such that it fits through the centre of the first roller and the circular apertures 1205 of the top plate and circular apertures 907 of the end plate of the first elongate arm. The first roller pin has a length such that it can pass through the centre of the first roller and position said first roller within the substantially rectangular apertures of the top plate and end plate of the first elongate arm by being held in place by the circular apertures 1205 of the top plate and circular apertures 907 of the end plate of the first elongate arm.

[0100] Referring to Figure 15a there is herein illustrated schematically a front view of a second roller of the sliding mechanism 306.

[0101] The second roller comprises a cylinder 1501, with a hollow centre 1502 and circular disks 1503 at each end of the hollow cylinder 1501. The radius of the circular disks 1503 are larger than that of the hollow cylinder 1501.

[0102] Referring to Figure 15b there is herein illustrated schematically a side view of a second roller of the sliding mechanism 306.

[0103] The circular disks 1503 have a circular aperture 1503 which lines up with the hollow centre 1502 of the cylinder to allow a roller pin to pass through the entirety of the second roller. The second rollers are positioned beneath the second elongate arm at a first end of the first elongate arm close to the first hook and at a second end of the first elongate arm.

[0104] Referring to Figure 16 there is herein illustrated schematically a second roller pin of the sliding mechanism 306.

[0105] The second roller pin comprises a cylinder 1601 with two apertures 1602 at either end of the cylinder 1601.

[0106] The second roller pin has a diameter such that it fits through the centre of the second roller. The apertures 1602 are for receiving non-conductive screws holding the second roller in position below the second elongate arm at each position 306 along the measuring device. The first roller pin has a length such that it can pass through the second roller and position said second roller between the protrusions 306 of the front plate and back plate of the first elongate arm. The second rollers are held in place by a non-conductive screw at either end of the scond roller pin between the second roller and the front plate and back plate of the first elongate arm.

Second elongate arm [0107] Referring to Figure 17 there is herein illustrated schematically the main body of said second elongate arm of the measuring device.

[0108] The main body of said second elongate arm comprises a hollow beam 1701. The hollow beam comprises four sides, each side is rectangular in shape. The hollow beam is slidably attached to the first elongate arm by the sliding mechanism detailed in Figures 13 to 16.

[0109] Referring to Figure 18 there is herein illustrated schematically the end stop 406 of the second elongate arm.

[0110] The end stop comprises a first hollow block 1801 and a second hollow block 1802. Said second hollow block is attached to the first hollow block at one end such that the two blocks are perpendicular. The second hollow block has a cross section smaller than the inside of said hollow beam, such that said second hollow block can fit inside said hollow beam attaching the end stop to the main body of the second elongate arm. The first hollow block 1801 is too large to pass through the sliding mechanism and prevents said second elongate arm from sliding past the first elongate arm and out of the measuring device.

[0111] Referring to Figure 19 there is herein illustrated schematically a twist and lock mechanism.

[0112] The twist and lock mechanism comprises a hollow cuboid 1901, a cuboid 1902, a cylinder 1903 an attachment piece 1904.

[0113] The hollow cuboid 1901 has a cross section smaller than that of the hollow beam 1701 such that the hollow cuboid fits within the hollow beam attaching the twist and lock mechanism to the main body of the second elongate arm. The attachment piece 1904 has a diameter smaller than that of the cylinder 1903 such that one end of the attachment piece fits into the cylinder, the other end of the attachment piece comprises an indent 1905 which provides the the twist and lock mechanism with attachment means. The twist and lock mechanism further comprises known means for allowing an attachment to be rotated 90 degrees and locked in place.

[0114] Referring to Figure 20 there is herein illustrated schematically a second hook.

[0115] The second hook comprises a main body 2001 at one end the main body comprises a curved hook 2002 a second end of the main body comprises an elongate cuboid 2003. Between said first and second ends of the main body there is a cuboid protrusion 2004 said protrusion being perpendicular to the main body.

The cuboid protrusion further comprising an aperture 2005 extending through the cuboid and through the main body of the second hook.

[0116] The aperture 2005 is for receiving the twist and lock mechanism and attaching the second hook to the second elongate arm, the twist and lock mechanism partially fills said aperture leaving a cylindrical shaped aperture at the top of the main body. The elongate cuboid 2003 has a flat undersurface 2006 for receiving a laser beam projected from the laser range finder. The curved hook 2002 is curved to guide objects into the underside of the hook 2007. The underside of the hook 2007 is at the same perpendicular distance from the laser rangefinder as the flat undersurface of the elongate cuboid such that when an object is placed within the curved hook 2002 the distance measured by the laser rangefinder is equivalent to the distance to the object within the curved hook.

S

[0117] Referring to Figure 21a there is herein illustrated schematically a side view of the second end of the second elongate arm.

[0118] The second end comprises a cuboid 2101, a cylindrical body 2102 and a protrusion 2103.

[0119] The cuboid 2101 is substantially flat with a relatively large cross section. The cylindrical body has a cross section smaller than that of the cylindrical aperture at the top of the second hook such that it can fit within said aperture. The protrusion 2103 is substantially cuboid and fits within the indent of the attachment piece of the twist and lock mechanism joining the second end of the second elongate arm to the twist and lock mechanism.

[0120] Referring to Figure 21b there is herein illustrated schematically a front view of the second end of the second elongate arm.

[0121] The cuboid 2101 comprises a circular aperture wherein the cylindrical body 2102 is attached to the cuboid. The cylindrical body 2102 further comprises a cylindrical aperture 2104 which extends throughout the cylindrical body and throughout the protrusion 2103.

Use and operation [0122] The measuring apparatus described herein is capable of measuring the following parameters: e System heights of OLE simple and compound; e. the length of dropper wires; a discrete clearances -such as DEP spigot separation; a measurement of clearances from OLE to ancillary conductors; a live equipment to earth, such as OLE portal structures, cantilevers and bridges; [0123] Initial setup of the measurement device is as follows. The user firstly needs to activate the wireless capabilities of the laser rangefinder and tablet computing device. The user tums on the laser rangefinder located on the measuring device, the Bluetooth÷ function is automatically enabled. The user then turns the tablet computing device on by pressing and holding the on/off button. The laser rangefinder and tablet computing device need to be paired in order for wireless transmission and remote operation to be functional. Measurement taken by the device will be recorded in a user selected document [0124] Once the wireless transmission and remote activation features are fully operational the user can connect the standard nonconductive pole to the adapter at the end of the measurement device. The standard nonconductive pole ideally has several locking pins located at one end, the pole can then be inserted into the adapter and twisted until the locking pins align with the apertures on the adapter and the device is fastened securely.

[0125] To measure distances the measuring device can be used in two modes. The first being with the second hook in the lock position, this is ideal for measuring distances between components of the OLE equipment for example, the distance between the contact wire and catenary wire. The second hook can be placed over the catenary wire and provides stability, holding the measuring device in place between the first and second component allowing accurate distance measurements to be taken. Due to the lightweight design of the measuring device it can be hung from OLE components during use and without disruption to their positioning.

[0126] In a second mode used to measure distances between objects too large to be encompassed by the second hook, or for distances larger than the span between the first and second hook, the twist and lock mechanism allows the second hook to be rotated such that the hook no longer blocks the laser emitted from the laser range finder and allows this to pass beyond the second hook to the object of interest The first hook can be placed over a first object such as a contact wire, this has the additional benefit of creating stability whilst the measuring device is in operation resulting in more accurate measurements.

[0127] The user can switch between each mode of the measuring device, measuring various parameters without the use of additional equipment [0128] Once the device is in position, the measurements can either be taken using the laser ranger interface or taken remotely using the tablet computing device. The measurements are automatically recorded in the document chosen by the user during the initial setup.

[0129] An optional mount can be added to the second hook for a camera device with G PS capabilities, such as a GoPro÷. A G PS location from a satellite will give an approximate position where a measurement is being taken, the position can be cross-referenced with the known design of the overhead line equipment to identify the specific component in question. Additional information on the equipment and surroundings can be given by pictures and videos taken by the G oP rot.

Variations [0130] An altemate sliding mechanism to that detailed in figures 13 -16 which allows the second elongate arm to be slidably attached to the first elongate arm. One example of an alternate sliding mechanism may comprise the first and second elongate arm comprising complementary shapes, wherein one fits within the other allowing the second elongate arm to be slidably attached to the first elongate arm.

Advantages [0131] The first hook has an advantage of creating stability whilst the measuring device is in operation resulting in more accurate measurement, allowing the user to maintain the position of the measurement device with ease.

The second hook also provides stability and has the same advantage, whilst the twist and lock mechanism allows the device to measure distances greater that the distance between the first and second hooks.

Overview of measuring device according to a second aspect of the invention (0132) Referring to Figure 22 herein there is illustrated schematically a measuring apparatus 2200, suitable for taking measurements of overhead line equipment specifically for measuring system heights of OLE simple and compound, the length of dropper wires, discrete clearances -such as DEP spigot separation, clearances from OLE to ancillary conductors, live equipment to earth.

The measuring apparatus comprises an arm 2201 having a first end being movably connected to an adapter 301 for attaching the measurement device to a standard electrically nonconductive pole; and at a second end, a hollow portion 2202.

[0133] The measuring apparatus 2200 comprises an arm 2201, an adapter 301, a hollow portion 2202, a laser rangefinder 2203 and a hook 2204. The arm 2201 for houses the laser rangefinder 2203 and the hollow portion 2202 is located above the laser rangefinder 2203 such that a laser beam projected by the laser rangefinder is not obstructed by the arm 2201. The arm further comprises a hook 2204 located at the back of the arm 2201, the hook can be placed over the contact wire which then provides the measurement device with the necessary stability for precise measurements of the overhead line equipment to be taken. Once the hook is in position over the contact wire, the measurement apparatus can be angled by the user to aim the laser beam at other parts of the overhead line equipment and nearby objects. The laser rangefinder is capable of measuring distance from an object located at the hook to a second object using a known technology, for example optical time domain reflectometry (OT DR).

[0134] In the best mode embodiment the laser rangefinder comprises a transceiver for wireless communication within wireless range of a nearby portable computing device, for example a tablet computing device which is also fitted with a wireless transceiver for communicating with the laser rangefinder 2203. In the best most the handheld computing device has a camera for documenting the surrounding area and a touch sensitive screen capable of receiving user instructions through touching icons or areas of the touch sensitive screen, as in known in the art.

[0135] The arm of the device is manufactured from a nonconductive polymer, such as nylon or the like. The apparatus has an electrical appliance Class It or double insulated status and had been tested up to 50,000 volts, double that carried by the standard contact wire.

[0136] Referring to Figure 23 herein there is illustrated schematically the measuring apparatus of Figure 22 in exploded view, including an arm 2201, an adapter 301, a hollow portion 2202, a laser rangefinder 2203 and a hook 2204. Also shown is a tilting mechanism 2301 which attaches to the arm 2201 and the adapter 301 such that the tilting mechanism allows the arm to be tilted in relation to the adapter and the standard nonconductive pole when connected.

[0137] The arm 2201 comprises a first cavity 2302, a second cavity 2303, an aperture 2304, a hollow portion 2202, and a back panel 2305.

[0138] The arm 2201 comprises a first cavity 2302 in which the laser rangefinder electronic measuring device 2203 is housed and a back panel 2305 keeping the laser rangefinder 2203 in position. The back panel 2305 is connected to the arrn by way of six screws 2306 two of the screws being located at the upper peripheries of the back panel 2305 and four of the screws being located at the lower peripheries. The back panel 2305 keeps the laser rangefinder within the first cavity of the arm and further comprises a rectangular aperture 2307 where the back of the laser rangefinder can be accessed to enable battery changes. The back panel further comprises a hook 2204.

[0139] Referring to Figure 24 herein there is illustrated schematically the arm 2201 of the measuring device in a front view.

[0140] The arm 2201 comprises a first cavity 2302 for a laser rangefinder, the first cavity is created by the front of the arm which comprises a substantially rectangular shape being that the first cavity comprises a substantially cuboid shape to house the substantially cuboid laser rangefinder in a tight fit. The laser rangefinder must be held firmly in position inside the cavity, movement of the laser rangefinder within the cavity could lead to displacement of the laser rangefinder which may result in incorrect readings and damage to the device. The front of arm further comprises an aperture 2401 where the display and functional buttons of the laser rangefinder can be accessed by the user.

[0141] The hollow portion 2202 extends from the first cavity of the arm and narrows towards the second end of the arm 2201. The purpose of the hollow portion is to allow a laser beam emitted from the laser rangefinder housed within the arm 2201 pass through the device unobstructed whilst keeping the laser rangefinder in position.

[0142] Referring to Figure 25 herein there is illustrated schematically the arm 2201 of the measuring device in a cutaway side view.

[0143] The first cavity 2302 is located near the center of the arm 2201.

There is a second cavity 2303 located below the first cavity 2302. The second cavity 2303 is smaller than the first cavity having a shorter width and is located centrally below the first cavity, such that the tight fit of the laser rangefinder within the first cavity is not altered. The second cavity 2303 houses the head of a bolt which attaches the arm to the tilting mechanism, preventing the bolt from protruding into the first cavity.

[0144] The hollow portion 2202 comprises a channel 2501 which extends from the first cavity of the arm, through the entirety of the hollow portion 2202 and through the second end of the arm. The channel may vary in width but must be wide enough to accommodate the laser beam emitted from the laser rangefinder. The hollow portion may comprise an additional side to enclose the channel 2501.

[0145] Referring to Figure 26 herein there is illustrated schematically the back panel 2305 of the measuring device in a perspective view.

[0146] The back panel comprises a substantially rectangular shape with a hook 2204 located at a proximal end. The hook comprises a flat undersurface 2601, an object such as a contact wire, can be placed against the flat undersurface 2601 and the lower end of the back panel 2305 such that the device is stable when taking measurements at height The hook further comprises two sides 2602 which extend diagonally from the flat undersurface 2601 towards the top end of the back panel 2305. The sides are connected only by the flat undersurface and the back panel such that they do not obstruct the rectangular aperture 2307 which gives the user access to the back of the laser rangefinder. The sides 2602 support the undersurface of the hook 2204 so that it is not subject to bending when the device is in use.

[0147] Referring to Figure 27 herein there is illustrated schematically the tilting mechanism 2301 and the adapter 301 of the measuring device.

[0148] The titling mechanism 2301 comprises a handle pin 2701, a first joint half 2702, a second joint half 2703, a shoulder bolt 2704, and a set screw 2705. The first joint half 2702 is attached to the arm via a bolt The second joint half 2703 is attached to the adapter 301 by said set screw 2705.

[0149] The first joint half 2702 and second joint half both receive shoulder bolt 2004 which is then secured in place by handle pin 2701. The first and second joint halves are rotatable in relation to each other by 90 degrees. The tilting mechanism allows the device to be tilted up to 90 degrees in relation to the adapter 301.

[0150] The lilting mechanism may further comprise a handle located on the handle pin 2701 to aid the user in tilting the measuring device.

[0151] Referring to Figure 28a herein there is illustrated schematically a joint half 2702 and 2703 of the tilting mechanism of the measuring device in a cross-sectional view.

[0152] The joint half comprises a cylindrical lower half 2801, a joint head 2802 and a connecting portion 2803.

[0153] The cylindrical lower half 2801 comprises an aperture located centrally for receiving a set screw 2705. The cylindrical lower half is for attaching the joint half to other components of the measuring device, in this case the adapter and the elongate arm.

[0154] The connecting portion 2803 is located between the cylindrical lower half 2801 and the joint head 2802. The connecting portion comprises a substantially cylindrical shape, with a radius larger than that of the cylindrical lower half.

[0155] The joint head 2802 comprises a first flat side 2804 and a second flat side 2805.

[0156] Referring to Figure 28b herein there is illustrated schematically a joint half of the tilting mechanism of the measuring device in a front view.

[0157] The first flat side 2804 of the joint head 2802 comprises an aperture 2106 located centrally of the first flat side 2804, the aperture passing through the entirety of the joint head including the second flat side 2805. The aperture 2806 is for receiving a shoulder bolt 2704 for connect two joint halves together. The first flat side further comprises smaller shallow apertured 2807 located around the aperture 2806 every 45 degrees.

Use and operation [0158] The measuring apparatus described herein is capable of measuring the following parameters: a System heights of OLE simple and compound; a the length of dropper wires; a discrete clearances -such as DEP spigot separation; a measurement of clearances from OLE to ancillary conductors; a live equipment to earth, such as OLE portal structures, cantilevers and bridges; [0159] Initial setup of the measurement device is as follows. The user firstly needs to remove the equipment from tS carry case and place the case away from the work area. The user then needs to activate the wireless capabilities of the laser rangefinder and tablet computing device. The user turns on the laser rangefinder located on the measuring device, the Bluetooth+ function is automatically enabled. The user then turns the tablet computing device on by pressing and holding the on/off button. The laser rangefinder and tablet computing device need to be paired in order for wireless transmission and remote operation to be functional. Measurements taken by the device will be recorded in a user selected document [0160] Once the wireless transmission and remote activation features are fully operational the user can connect the standard nonconductive pole to the adapter at the end of the measurement device. The standard nonconductive pole ideally has several locking pins located at one end, the pole can then be inserted into the adapter and twisted until the locking pins align with the apertures on the adapter and the device is fastened securely.

[0161] The hook can be placed over a first object such as a contact wire, this has the additional benefit of creating stability whilst the measuring device is in operation resulting in more accurate measurements. Alternatively, before the device is positioned for measuring, the titling mechanism can be adjusted by turning the handle and moving the device 90 degrees, the handle can be turned in the opposite direction to secure the device in place. When the device has been rotated 90 degrees it is placed on the contact wire from the side. Once the device is in position, the measurements can either be taken using the laser ranger interface or taken remotely using the tablet computing device. The measurements are automatically recorded in the document chosen by the user during the initial setup.

[0162] An optional mount can be added to the arm for a camera device with G PS capabilities, such as a GoPro÷. A G PS location from a satellite will give an approximate position where a measurement is being taken, the position can be cross-referenced with the known design of the overhead line equipment to identify the specific component in question. Additional information on the equipment and surroundings can be given by pictures and videos taken by the GoP ID+ . [0163] Due to the device being compact it may be carried in a case with foam inserts shaped to hold the measurement device as well as any additional apparatus such as a camera device and computing device.

Remote measurement operation [0164] The tablet computing device enables the laser range finder to be activated remotely. The measurements taken by the device are then wirelessly transmitted to the tablet computing device held by the worker and recorded on the selected document [0165] The distance of interest is measured and displayed on the digital visual display of the laser rangefinder mounted at the lower end of the device. It is likely the distance of interest will be out of reach of the user, and the visual display not visible. The user will be on the ground, most likely at the side of the track.

Advantages [0166] Transmission of data from the laser rangefinder to the tablet computing device reduces transcription errors and reading errors which reduce unnecessary rework.

S

[0167] The device for manual measurements whilst the overhead line equipment is live. Line closures are not necessary, reducing disruption to the rail service. Machines used to access contact wire are not necessary, as the OLE can be accessed from the ground using a nonconductive pole.

[0168] The hook has an advantage of creating stability whilst the measuring device is in operation resulting in more accurate measurements, allowing the user to maintain the position of the measurement device with ease. The tilting mechanism allows the device to be directed through a wider range of angles without straining the user.

Claims

Claims 1. A measurement device for measuring physical parameters of a railway, said device comprising: a first arm; a first hook located on said first arm; a laser rangefinder; and means for holding said laser rangefinder in a known spatial relation to said first hook.
2. The measurement device as claimed claim 1 wherein said first arm comprises a hollow portion, such that a laser beam projected by said laser rangefinder is not obstructed by said arm.
3. The measurement device as claimed in claim 2 wherein the device further comprises an adapter for connecting said measurement device to a pole; and wherein said arm is rotatable in relation to said adapter.
4. The device as claimed in claim 3, further comprising a lilting joint located between said arm and said adapter.
5. The device as claimed in claim 2, wherein said first arm is located between said first hook and said laser rangefinder.
6. The device as claimed in claim 5, wherein the device further comprises: a second arm; a second hook located at one end of said second arm.
7. The device as claimed in claim 6, wherein said second hook comprises; an under surface at a first end; wherein said under surface at a first end is perpendicular to said laser range finder.
8. The device as claimed in claim 7 further comprises a sliding means; wherein said second aim is slidably attached to said first arm by said sliding 15 means.
9. The device as claimed in claim 8 where said sliding means comprises; a plurality of rollers; a plurality of roller pins; wherein said plurality of rollers rotate around said plurality of roller pins.
10. The device as claims in claim 9 wherein said plurality of rollers are placed at either side of said second elongate arm.
11. The device as claimed in claim 10 further comprising a twist and lock mechanism; wherein said second hook is attached to said second elongate arm by said twist and lock mechanism; and wherein said second hook can be rotated such that a laser beam projected by said laser rangefinder is not obstructed by said second hook.
12. The measurement device as claimed in any claims 5 to 11 wherein the device further comprises an adapter for connecting said measurement device to a pole.
13. The measurement device as claimed in any of the proceeding claims wherein said laser rangefinder further comprises means for communicating with a remote computing device; and wherein said remote computing device comprises means for controlling said laser rangefinder and receiving measurements taken by said laser rangefinder.
14. The measurement device as claimed in any of the proceeding claims wherein the device comprises a nonconductive polymer.
15. The measurement device as claimed in any one of the proceeding claims wherein the device weighs 4kg or less.
16. A method of determining the distance from an overhead contact wire, said method comprising: from a position below said contact wire, raising an electrically nonconductive pole adjacent said contact wire; said pole having at a distal end, a first arm; and a first hook located on said first arm; holding a laser rangefinder in a known spatial relationship to said first hook; engaging said first hook with said overhead contact wire; and using said laser rangefinder to capture a distance measurement between said laser rangefinder and an object
17. The method as claimed in claim 16, further comprising aiming a laser beam generated by said laser rangefinder device at the overhead line equipment.
18. The method as claimed in claim 16, wherein said object is a bridge above the overhead line equipment 10
19. The method as claimed in claim 16, further comprising; a second hook; engaging said second hook with a catenary wire; and using said laser rangefinder to capture a distance measurement between said laser rangefinder and said second hook.
20. The method as claimed in claims 16 to 19, carried out when said contact wire is electrically live.
21. The method as claimed in any one of claims 16 to 20, wherein said pole is manually held by a human operative.
22. The method as claimed in any one of claims 16 to 21, further comprising wirelessly transmitting a set of one or more distance measurements between said laser rangefinder and a remote computing device.
23. A method of determining a distance to an overhead contact wire using a measurement device for measuring physical parameters of a railway, said measuring device comprising: a first arm; a first hook located on said first arm; a laser rangefinder; and means for holding said laser rangefinder in known spatial relation to said first hook; said method comprising: maintaining said laser rangefinder in a known spatial relationship to said first hook; engaging said first hook with said overhead contact wire; and using said laser rangefinder to capture a distance measurement between said laser rangefinder and another object.