GB2358945A - Fog signal attachment means - Google Patents

Fog signal attachment means Download PDF

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Publication number
GB2358945A
GB2358945A GB0008564A GB0008564A GB2358945A GB 2358945 A GB2358945 A GB 2358945A GB 0008564 A GB0008564 A GB 0008564A GB 0008564 A GB0008564 A GB 0008564A GB 2358945 A GB2358945 A GB 2358945A
Authority
GB
United Kingdom
Prior art keywords
magnetic
layer
fog signal
intermediate layer
rail
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0008564A
Other versions
GB2358945A8 (en
GB0008564D0 (en
Inventor
Susan Jane Kirby
Alan Lindsay
Darrie Jon Windeatt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SITE ACCESS SERVICES Ltd
Original Assignee
SITE ACCESS SERVICES Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SITE ACCESS SERVICES Ltd filed Critical SITE ACCESS SERVICES Ltd
Publication of GB0008564D0 publication Critical patent/GB0008564D0/en
Priority to PCT/GB2001/000432 priority Critical patent/WO2001056859A1/en
Priority to AU2001230398A priority patent/AU2001230398A1/en
Publication of GB2358945A publication Critical patent/GB2358945A/en
Publication of GB2358945A8 publication Critical patent/GB2358945A8/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/20—Audible signals, e.g. detonator audible signalling
    • B61L5/203—Detonators; Track mounting means; Composition of the detonative product

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

A fog signal device comprises a body 2 containing explosive and magnetic attachment means 6 for holding the body 2 onto a railway rail 3. A disc shaped fog signal body 2 is attached to a railway rail 3 by a first layer 6 and a second layer 8. The first layer 6 is an annular shape and is made from an anisotropic magnetic material. The second layer 8 is a circular disc shape and is also made from an anisotropic magnetic material. The first layer 6 is placed on top of the second layer 8 the layers are naturally attracted by the magnetic properties of the respective layers. An additional adhesive may be placed between the contacting surfaces to provide a better bond between the layers. When the two layers 6,8 are placed together a circular recess is formed. The fog signal body 2 is placed in the recess and comprises a metal casing which is attracted to the magnetic device 1.

Description

1 2358945 FOG SIGNAL ATTACHMENT MEANS AND A METHOD OF IDENTIFICATION The
present invention relates to magnetic means for attaching a fog signal device to a railway rail, and a method of identification thereof and is concerned particularly with a magnetic lamina and a method for attaching a fog signal device to a railway rail.
A known fog signal comprises a tablet shaped metal body that contains explosive material and two fixing straps attached to the underside of the body. The straps are made of lead. In order to secure the metal body onto the top of the rail the fog signal is placed on top of a rail and the two lead straps are folded around the edges of the rail. When a train runs over the fog signal the explosive is detonated.
We have discovered that the lead straps easily break off from the body rendering the fog signal unusable.
According to a first aspect of the present invention there is provided a fog signal device comprising a fog signal body containing explosive and magnetic attachment means for holding the body onto a railway rail.
Preferably, the magnetic means comprises a layer of magnetic material, the arrangement being such that, in use, the layer of magnetic material holds the fog signal body onto the uppermost surface of the railway rail.
A portion of the layer of magnetic material may be positioned in direct contact with a surface of the fog signal body.
In use a portion of the magnetic layer is preferably disposed between the fog signal body and the rail.
2 The magnetic means preferably comprises a flexible magnetic sheet material.
The flexible magnetic material preferably has been so magnetised as to comprise a series of magnetic poles.
The series of magnetic poles are preferably arranged in an identifiable pattern, which may be a regular or an irregular pattern.
According to a first embodiment of the present invention the magnetic means comprises a first layer of magnetic material in contact with a second layer of magnetic material, the arrangement being such that, in use, the first layer is in contact with the fog signal body and the second layer is in contact with the railway rail.
The first layer of magnetic material is preferably an annular shape.
The second layer of magnetic material is preferably an elongate shape. The second layer of magnetic material is preferably a rectangular shape Preferably in use the second layer of magnetic material extends along the longitudinal length of the rail and is in contact with the uppermost surface of the railway rail.
Alternatively, in use, two ends of the elongate layer of magnetic material are in contact with the two respective sides of the railway rail.
The second layer is preferably formed with a pair of straps, each strap extending from the respective sides of the second layer.
6 3 In use the straps are preferably folded over the top of the fog signal body.
Alternatively the straps extend downwardly along the respective sides of the railway rail.
The magnetic material preferably has been so magnetised as to comprise a series of magnetic pole strips.
According to a second embodiment of the present invention the magnetic means comprises an elongate layer of magnetic material, the arrangement being such that, in use, the uppermost surface of the elongate layer is in contact the fog signal body and the lowermost surface of the elongate layer is in contact with the railway rail.
The elongate layer is preferably formed with a pair of straps, each strap extending from the respective sides of the second layer.
The layer of magnetic material has preferably been so magnetised as to comprise a series of magnetic poles.
According to a second aspect of the present invention there is provided a method for attaching a fog signal body to a railway rail, the method comprising using magnetic means to hold the fog signal onto the rail.
Preferably the method comprises first placing a magnetic material onto the fog signal body and then placing the magnetic material and fog signal body onto a railway rail.
According to a third aspect of the present invention there is provided a fog signal device comprising a fog signal body containing an explosive, a 4 first intermediate layer bonded to the fog signal body and magnetic attachment means for holding the fog signal body, and the first intermediate layer onto a railway rail.
The first intermediate layer is preferably an annular shape.
Preferably, the first intermediate layer is a non-magnetic material.
The first intermediate layer is preferably a foam material.
The fog signal device preferably comprises a second intermediate layer bonded to the first intermediate layer, the second intermediate layer being disposed between the first intermediate layer and the magnetic 10 means.
The second intermediate layer is preferably a metallic material.
Preferably the second intermediate layer is bonded to the magnetic means.
The magnetic means is preferably a magnetic sheet.
The magnetic sheet is preferably so magnetised as to comprise a series of magnetic poles arranged in an identifiable pattern.
The magnetic pole configuration is preferably in the form of pole strips.
Preferably, adjacent pole strips have an alternate polarity.
The pole strips preferably do not all have the same pitch width.
00 .. 0 . 1 According to a fourth aspect of the present invention there is provided a method of identifying a fog signal device comprising a fog signal body containing explosive and magnetic attachment means for holding the body onto a railway rail, the method comprising placing a flux sensitive film over the magnetic means in order to reveal a magnetic field signature of the magnetic means.
There are particular advantages to combining the features of the various aspects of the present invention and the invention may include any combination of the features or limitations referred to herein.
The present invention may be carried into practice in various ways and some embodiments will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure la is a plan view of part of a first embodiment of the present invention and shows an annular magnetic layer; Figure lb is a plan view of part of a first embodiment and shows a magnetic disc; Figure le is a side view of a fog signal body attached to a rail by the annular magnetic layer shown in Figure la and the magnetic disc shown in Figure lb; Figure 2a, is a plan view of a second embodiment of the present invention and a fog signal body; Figure 2b is a side view of the second embodiment and the fog signal body and the fog signal body placed on a rail, 6 Figure 3a is a plan view of a third embodiment of the present invention; Figure 3b is a side view of the third embodiment and the fog signal body placed on a rail; Figure 4a is a plan view of a fourth embodiment of the present invention; Figure 4b is a side view of the fourth embodiment and a fog signal body placed on a rail; Figure 5a, is a plan view of a fifth embodiment of the present invention; Figure 5b is a side view of the fifth embodiment and a fog signal placed on a rail; Figure 6a is a plan view of first magnetic layer of a sixth embodiment of the present invention; Figure 6b is a plan view of a second layer of the sixth embodiment; Figure 6e is a side view of the sixth embodiment and a fog signal body placed on a rail; Figure 7a is a plan view of a fog signal body; Figure 7b is a side view of a fog signal body showing one attached lead strap and one broken lead strap; 7 Figure 8a, is a plan view of a seventh embodiment of the present invention showing a pair of straps in an open arrangement; is Figure 8b is a plan view of the seventh embodiment shown in Figure 8a placed on a rail and including a fog signal body, the straps being in a closed arrangement; Figure 8c is a side view of the fog signal body shown in Figure 8b placed on a rail; Figure 9a, is a side view of an eighth embodiment of the present invention placed on a rail; Figure 9b i Figure 9 a; s a base view of the fog signal device shown in Figure 9e is a cross-section through X-X of the fog signal device shown in Figure 9b; Figure 10 is a plan view of a sheet of flux sensitive film; Figure 11 is a plan view of the sheet shown in Figure 10 placed over the magnetic layer of the fog signal device shown in Figure 9a; and Figures 12 and 13 are views corresponding to Figure 9b showing modified configurations of the magnetic poles.
With reference to Figures la, lb, lc, a device 1 for attaching a disc shaped fog signal body 2 to a railway rail 3 comprises a first layer 6 and a second layer 8. The first layer 6 is an annular shape and is made from an anisotropic magnetic material. The second layer 8 is a circular disc 1 8 shape and is also made from an anisotropic. magnetic material. The first layer 6 is placed on top of the second layer 8. The first layer 6 and second layer 8 are naturally attracted towards each other due to the magnetic properties of the respective layers. An additional adhesive may be placed between the contacting surfaces to provide a better bond between the layers. When the two layers 6,8 are placed together a circular recess is formed.
The fog signal body 2 is placed on the first layer 6 of the device 1. The fog signal body 2 comprises a metal casing that contains explosive material. The fog signal body 2 is naturally attracted to the magnetic device 1. Additional adhesive can be used to provide a stronger bond between the device 1 and the fog signal body 2. A number of units comprising the device 1 and the fog single body 2 can be assembled. It is normal practice in the railway industry to carry packs of ten fog signal devices. In use the fog signal body 1 and the device 1 are placed on the uppermost surface 20 of the rail 3. The magnetic property of the device 1 holds the device 1 against the rail 3 and the fog signal body 2 in place.
Figure 7a and 7b show a known type of fog signal device 10 comprising a disc shaped body 12 and two lead straps 14, 15. The lead straps 14, 15 are originally attached to the underneath surface of the body 12. A common problem with these types of fog signal 10 is that the lead straps brake off. In Figure 7b strap 14 has broken off and there is a short portion 18 left extending from the underneath surface of the body 12.
The brake of the strap tends to be near the signal body 12. Once one or more of the straps have broken off the fog signal is unusable.
With the present invention either a new fog signal body having no straps or an old fog signal body with broken straps can be placed on the 9 uppermost surface of the first layer 6. The circular recess that is formed by the first and second layers 6,8 receives the short portions 18 of the broken straps.
With reference to Figures 2a and 2b, a device for attaching a disc shaped fog signal body 2 to a railway rail 3 comprises a rectangular lamina strap 22 formed with two tongues 24,25 that extend from the respective longitudinal edges 26,27 of the strap 22. The strap 22 is made from a flexible anisotropic magnetic sheet material. When the device 22 is place placed along the railway rail 3 (see Figure 2b) the two tongues 24, 25 fold downwardly against the respective sides of the rail 3. The tongues 24, 25 are magnetically attracted to the metal rail 3. The tongues 24, 25 help to hold the device 22 and the fog signal body 2 onto the rail 3.
With reference to Figures 3a and 3b, a device for attaching a disc shaped fog signal body 2 to a railway rail 3 comprises a rectangular lamina strap 32 formed with two longitudinal slits 34, 35 that extend through the strap 32. The strap 32 is made from a flexible anisotropic magnetic sheet material. The slits 34, 35 form a central rectangular portion 36. The body 2 is slid under the central portion 36 and is held between the two slits 34, 35.
With reference to Figures 4a and 4b, a device for attaching a disc shaped fog signal body 2 to a railway rail 3 comprises an upper rectangular lamina strip 42 attached to a lower rectangular strip 44. The upper strip 42 is formed with a pair of arcuate upstanding collars 46, 48. The collars 46, 48 define a central region 50. The fog signal body 2 is placed onto the central region 50. The collars 46, 48 abut the radially outermost circular surface of the body 2 and help hold the body 2 onto the central region 50.
With reference to Figures 5a and 5b, a device for attaching a disc shaped fog signal body 2 to a railway rail 3 comprises a central annular portion 50 and two straps 52, 53 extending radially therefrom. The annular portion 50 is formed with a central circular hole 54 that extends through the portion 50. The device is made from a flexible anisotropic magnetic sheet material. In use the fog signal body 2 is placed over the hole 54 and onto the uppermost surface of the annular portion 50. The annular portion 50 is then placed onto the uppermost surface of the rail 3. The two straps 52, 53 extend downwardly against the respective 10 sides of the rail 3.
With reference to Figures 6a, 6b and 6c, a device for attaching a disc shaped fog signal body 2 to a railway rail 3 comprises an upper oval lamina strip 62 attached to a lower oval strip 64. The upper strip 62 is formed with a circular hole 66 extending there through. The fog signal body 2 is placed onto the uppermost surface of the upper oval strip 62. When the fog signal body 2 comprises a short portion 18 of broken lead strap the portion 18 is received within the hole 66.
With reference to Figures 8a, 8b and 8c, a device 70 for attaching a disc shaped fog signal body 2 to a railway rail 3 comprises a rectangular strip 71 formed with two rectangular straps 72, 74 extending perpendicularly from the respective longitudinal edges 76, 78 of the strip 71. Disposed on the uppermost surface of the strip 71 is an annular portion 80. The device 1 is made from a flexible anisotropic magnetic sheet material. In use the fog signal body 2 is placed on the uppermost surface of the annular portion 80 and the straps 72, 74 are folded over the top of the body 2. The straps 72, 74 are magnetically attracted to the metal body 2 and help hold the body 2 onto the annular portion 80. The 11 combined device and body 2 are placed on the rail 3. The strip 71 extends along the longitudinal length of the rail 3.
When the device 70 and the fog signal body 2 are transported the two halves of the strip 71 can be folded over on top of each other, one of the halves will be in contact with the straps 72, 74 and the body 2. The two folded halves of the strip 71 are held in the closed arrangement due to the magnetic property of the material.
With reference to Figures 9a, 9b, 9c, a device 80 for attaching a disc shaped fog signal body 2 to a railway rail 3 comprises a first intermediate layer 82, a second intermediate layer 84, and a magnetic layer 86.
The first intermediate layer 82 is an annular shape and is made from an acrylic foam material. The second intermediate layer 84 is a circular disc shape which has a thickness of 0.5mm and is made from a metallic material such as zinc plated mild steel. The second intermediate layer 84 is bonded to the magnetic layer 86 and helps to retain the magnetic field of the magnetic layer 86. The first intermediate layer 82 is bonded to the base of the fog signal body 2 by a suitable adhesive, and is also bonded to the second intermediate layer 84 by a suitable adhesive.
The magnetic layer 86 is a circular disc shape of hi-energy flexible bonded magnetic sheet. The magnetic sheet is so magnetised as to comprise a series of parallel strips of alternate north and south poles. The pattern of the strips preferably provides a magnetic pull of about 2.5Kg on a mild steel surface. Preferably, the pitch widths of each strip are not the same. The combination of different widths can be provided for a particular batch of devices 80. The arrangement of the different widths of the strips can be a signature of a particular batch.
12 With reference to Figures 10 and 11, a flux film 90 (the film being known to the skilled person in the field of magnets) is used to provide an image of the strips of the magnetic layer 86. When the film 90 is placed over the magnetic layer 86 a dark image 91 of the magnetic flux of the respective strips appears on the film 90. The combination of the different widths 90 and 92 can be seen and the particular batch identified using the flux film. The different widths of the magnetic layer act as a kind of 'barcode' to enable the particular batch to be identified.
In an alternative arrangement of the strips of the magnetic layer 86 one or more of the strips is/are formed with a bulge or kink. This feature would be common to a particular batch of devices. Once again the flux film would be used to reveal the identifying feature of the device and so identify the particular batch.
Figure 13 shows an alternative pattern of wavy pole strips that can be created by suitably magnetising the magnetic sheet material of layer 86, and Figure 12 shows a radial pattern of pole strips. In both cases the non-uniform pattern can provide identification of the device.
The overall thickness of the body, the first intermediate layer 82, the second intermediate layer 84 and a magnetic layer 86 substantially equals the thickness of the existing fog signal device 10 (shown in Figures 7a and 7b). This fact means that a batch of the inventive devices can be carried in existing transport containers without any excessive rattling.
13

Claims (18)

1. A fog signal device comprising a fog signal body containing explosive and magnetic attachment means for holding the body onto a railway rail.
2. A device as claimed in claim 1 in which the magnetic means comprises a layer of magnetic material, the arrangement being such that, in use, the layer of magnetic material holds the fog signal body onto the uppermost surface of the railway rail.
3. A device as claimed in claim 2 so constructed that in use a portion of the magnetic layer is disposed between the fog signal body and the rail.
4. A device as claimed in claim 2 or claim 3 in which the magnetic means comprises a flexible magnetic sheet material.
5. A device as claimed in claim 4 in which the flexible magnetic sheet material has been so magnetised as to comprise a series of magnetic poles.
6. A fog signal device as claimed in claim 1 and comprising a first intermediate layer bonded to the fog signal body, the magnetic attachment means being so arranged as, in use, to hold the fog signal body and the first intermediate layer onto a railway rail.
7. A device as claimed in claim 6 in which the first intermediate layer is an annular shape.
14
8. A device as claimed in claim 6 or claim 7 in which the first intermediate layer is a non-magnetic material.
9. A device as claimed in any one of claims 6 to 8 in which the first intermediate layer is a foam material.
10. A device as claimed in any one of claims 6 to 9 comprising a second intermediate layer bonded to the first intermediate layer, the second intermediate layer being disposed between the first intermediate layer and the magnetic means.
11. A device as claimed in claim 10 in which the second intermediate 10 layer is a metallic material.
12. A device as claimed in any of the preceding claims in which the magnetic attachment means comprises a magnetic sheet so magnetised as to comprise a series of magnetic pole strips.
13. A device as claimed in claim 12 in which adjacent pole strips have 15 an alternate polarity.
14. A device as claimed in claim 12 or 13 in which the pole strips do not all have the same pitch width.
15. A device as claimed in any one of claims 12 to 14 in which the pole strips are straight, parallel strips.
16. A device as claimed in claim 2 in which the magnetic means comprises a first layer of magnetic material in contact with a second layer of magnetic material, the arrangement being such that, in use, the first layer is in contact with the fog signal body and the second layer is in contact with the railway rail.
17. A device as claimed in claim 16 in which the second layer of magnetic material is adapted to extend, 'in use, along the longitudinal length of the rail and to be in contact with the uppermost surface of the railway rail.
18. A method of identifying a fog signal device comprising a fog signal body containing explosive and magnetic attachment means for holding the body onto a railway rail, the method comprising placing a flux sensitive film over the magnetic means in order to reveal a magnetic field signature of the magnetic means.
GB0008564A 2000-02-04 2000-04-07 Fog signal attachment means Withdrawn GB2358945A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/GB2001/000432 WO2001056859A1 (en) 2000-02-04 2001-02-02 Attachment means for a signalling device and method of identification
AU2001230398A AU2001230398A1 (en) 2000-02-04 2001-02-02 Attachment means for a signalling device and method of identification

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0002474A GB0002474D0 (en) 2000-02-04 2000-02-04 Fog signal attachment means

Publications (3)

Publication Number Publication Date
GB0008564D0 GB0008564D0 (en) 2000-05-24
GB2358945A true GB2358945A (en) 2001-08-08
GB2358945A8 GB2358945A8 (en) 2002-02-13

Family

ID=9884886

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0002474A Ceased GB0002474D0 (en) 2000-02-04 2000-02-04 Fog signal attachment means
GB0008564A Withdrawn GB2358945A (en) 2000-02-04 2000-04-07 Fog signal attachment means

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB0002474A Ceased GB0002474D0 (en) 2000-02-04 2000-02-04 Fog signal attachment means

Country Status (1)

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GB (2) GB0002474D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2427953B (en) * 2005-06-30 2009-06-03 Systems & Solutions Explosive warning assemblies

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262844A2 (en) * 1986-09-24 1988-04-06 The Commonwealth Of Australia Signalling device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262844A2 (en) * 1986-09-24 1988-04-06 The Commonwealth Of Australia Signalling device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2427953B (en) * 2005-06-30 2009-06-03 Systems & Solutions Explosive warning assemblies

Also Published As

Publication number Publication date
GB2358945A8 (en) 2002-02-13
GB0002474D0 (en) 2000-03-22
GB0008564D0 (en) 2000-05-24

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)