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Patent Searching and Data


Title:
RAIL FASTENING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/234785
Kind Code:
A1
Abstract:
A rail fastening device comprises a metal soleplate (11) for fixing to a support structure, a pair of clips (12) disposed on respective opposite sides of the soleplate (11) for engaging respective opposite sides of a rail (10) to be fastened and a resiliently deformable rail pad (20) disposed on the soleplate (11) between the clips (12). The rail pad (20) comprises elongate ribs (21) on its lower surface which extend into complementary sockets (18) formed in the upper surface of the soleplate (11), the sockets (18) and ribs (20) extending perpendicular to the longitudinal axis of the rail (10) in use. The socket and rib (18, 21) prevent the rail pad (20) from moving and locate the rail pad (20) in such a way that any forces applied thereto do not promote tearing.

Inventors:
BYGRAVE, Peter Nathan (34 Buccaneer Avenue, Brockworth, Gloucester Gloucestershire GL3 4TG, GL3 4TG, GB)
VARGAS, Luis Eduardo Rendon (1 Hale Close, Tuffley, Gloucester Gloucestershire GL4 0WH, GL4 0WH, GB)
Application Number:
GB2018/051703
Publication Date:
December 27, 2018
Filing Date:
June 19, 2018
Export Citation:
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Assignee:
GANTRY RAILING LIMITED (Sudmeadow Road, Hempsted, Gloucester Gloucestershire GL2 5HG, GL2 5HG, GB)
International Classes:
E01B9/68
Domestic Patent References:
WO2013053972A22013-04-18
Foreign References:
US4275832A1981-06-30
US20170107672A12017-04-20
CN104611999A2015-05-13
Attorney, Agent or Firm:
CHAPMAN IP (Cardiff Business Technology Centre, Senghennydd Road Cathays, Cardiff South Wales CF24 4AY, CF24 4AY, GB)
Download PDF:
Claims:
CLAIMS

1. A rail fastening device comprising a metal soleplate for fixing to a support structure, a pair of clips disposed on respective opposite sides of the soleplate for engaging respective opposite sides of a rail to be fastened and a resiliently deformable rail pad disposed on the soleplate between the clips, wherein the rail pad comprises an elongate rib on its lower surface which extends into a complementary socket formed in the upper surface of the soleplate, the socket and rib extending perpendicular to the longitudinal axis of the rail in use.

A rail fastening device as claimed in claim 1 , in which the length of the socket is longer than the length of the rib.

A rail fastening device as claimed in claim 1 or claim 2, comprising a plurality of parallel ribs which extend into corresponding respective sockets on the soleplate.

A rail fastening device as claimed in claim 3, in which a rib is disposed adjacent respective transversely-extending end edges of the rail pad.

A rail fastening device as claimed in any preceding claim, in which the rib resiliently engages with the socket.

A rail fastening device as claimed in any preceding claim, in which the clips are attached to the soleplate by a fastening which engages the soleplate.

A rail fastening device as claimed in any of claims 1 to 5, in which the clips are attached to the soleplate by a fastening which extends through the soleplate to engage an underlying support structure.

8. A rail fastening device as claimed in any of claims 1 to 5, in which the clips comprise a base which is fixed to the soleplate and a cap displaceably attached to the base for engaging the rail. A rail fastening device as claimed in claim 8, in which the base is fastened to the soleplate by welding.

A rail fastening device as claimed in claim 8, in which the base is formed integrally with the soleplate.

1 1. A rail fastening device as claimed in any preceding claim, in which the length of rib is the same as the width of the rail pad, the rib extending fully between opposite side edges of the pad.

12. A rail fastening device as claimed in claim 1 1 , in which the rail pad is formed by extrusion.

13. A rail fastening device as claimed in claim 8 as appended to claim 2, in which the caps are arranged to abut and displace the rail pad perpendicular to the longitudinal axis of the rail when the caps are displaced to engage the rail.

14. A rail fastening device as claimed in claim 2, in which the rib is slidable longitudinally of the socket.

Description:
RAIL FASTENING DEVICE

This invention relates to a device for fastening a rail to the ground or other support structure.

Cranes for dockyards and container terminals etc. run on steel rails which are fastened to the ground or other support structure by a plurality of rail fastening devices arranged at intervals along the rail. The base of a typical rail comprises a pair of oppositely-directed longitudinal flanges, against which the fastening devices clamp to hold the rail in-situ. DE7639481 and DE8112195 each disclose a typical rail fastening device comprising a metal soleplate for anchoring to the ground and a pair of displaceable clips mounted on respect of opposite sides of the soleplate for engaging the rail. An elastomeric rail pad is disposed between the underside of the rail and the soleplate. Typically, the rail pad comprises depending lips at its opposite ends, which engage over the transversely-extending end edges of the soleplate, so as to hold the rail pad in-situ.

In use, it will be appreciated that the rail pads are subjected to considerable intermittent loads as a crane moves along the rail. The forces applied to the rail pad can be simple compressive forces, sheer forces or a compressive force at one side only caused by the rail rotating about its axis under load. Each of the above- mentioned forces can cause the rail pad to move and/or tear. In either event, any problem with the pad is always blamed on the manufacturer or installer. With the foregoing in mind, we have now devised an improved rail fastening device.

In accordance with the present invention, there is provided a rail fastening device comprising a metal soleplate for fixing to a support structure, a pair of clips disposed on respective opposite sides of the soleplate for engaging respective opposite sides of a rail to be fastened and a resiliently deformable rail pad disposed on the soleplate between the clips, wherein the rail pad comprises an elongate rib on its lower surface which extends into a complementary socket formed in the upper surface of the soleplate, the socket and rib extending perpendicular to the longitudinal axis of the rail in use. The rib and socket prevent the rail pad from rotating or moving in line or laterally to the rail: this is achieved by the rail pad being retained between the rail and soleplate, so that is unable to bend against the clips, rise over the edge of the soleplate or tear gradually from one end. Existing rail pads have lips which engage over edges of the soleplate so they can deform and this aggravated by rounded edges and a relatively loose fit. Trapping the rail pad between the rail and soleplate largely eliminates these problems and locates the rail pad in such a way that any forces applied thereto do not cause movement or tearing. The clips may be displaceably mounted to the soleplate for movement perpendicular to the longitudinal axis of the rail in order to allow relative adjustment of the lateral position of the rail on the soleplate without disturbing the soleplate or any ground anchors. The length of the socket may be longer than the length of the rib, so that the lateral position of the rail pad can be adjusted according to the lateral position of the rail on the soleplate: it will be appreciated that the rib is slidable longitudinally of the socket.

The clips may arranged to abut and displace the rail pad perpendicular to the longitudinal axis of the rail as they are adjusted according to the lateral position of the rail, thereby ensuring that the rail pad always remains underneath the rail.

The rail pad may comprise a plurality of parallel ribs which extend into corresponding respective sockets on the soleplate. A rib may be disposed adjacent respective transversely-extending end edges of the rail pad.

The rib may resiliently engage with the socket.

The clips may be attached to the soleplate by a fastening which either engages the soleplate or the underlying support structure. Alternatively, the clips may comprise a base which is fixed to the soleplate and a displaceable cap attached to the base. The base may be fastened to the soleplate by welding or by fasteners such as bolts. Alternatively, the base and the soleplate may be formed integrally, for example by casting. The length of rib may be the same as the width of the rail pad, so that the rib extends fully between opposite side edges of the pad: this may be achieved by forming the rail pad by extrusion. An embodiment of the present invention will now be described by way of an example only and with reference to the accompanying drawings, in which:

Figure 1 is a perspective exploded view of a rail fastening device in accordance with the present invention;

Figure 2 is a perspective view of the rail fastening device of Figure 1 when in use;

Figure 3 is a plan view of a soleplate and rail pad of the rail fastening device of Figure 1 ;

Figure 4 is a sectional view along the line IV-IV of Figure 2; and Figure 5 is sectional view along the line V-V of Figure 4. Referring to the drawings, there is shown a rail fastening device comprising a rectangular or square soleplate 1 1 formed of steel. A pair of clips 12 for engaging a rail 10 are disposed on respective opposite sides of the soleplate 1 1. The clips 12 comprise a base portion 13, which is rigidly fastened to the soleplate 1 1 by welding or by fasteners such as bolts. The clips 12 further comprise a cap portion 14 which is slidably mounted to the base portion 13 for movement towards or away from the rail 10. The caps 14 of the clips 12 comprise elastomeric noses which engage over respective oppositely-directed flanges 10F at the base of the rail. Once positioned against the rail 10, the cap portions 14 are secured in-situ by tightening bolts 15 which extend from the base 13. The soleplate 1 1 is fixed to the ground or other support structure by means of ground-anchor bolts 16 which extend through apertures 17 in the soleplate 1 1.

The upper surface of the soleplate 1 1 comprises a pair of elongate channel-section sockets 18, which extend parallel to each other and transversely of the soleplate 11 , in a direction which extends perpendicular to the longitudinal axis of the rail 10. The rail fastening device further comprises a rail pad 20 of a resiliently flexible elastomeric material. The rail pad 20 comprises a pair of elongate ribs 21 , which extend parallel to each other and transversely of the rail pad 20 between opposite side edges thereof. The length of the ribs 20 are less than the length of the sockets 18. The ribs 18 may be dimensioned to resiliently deform when they are pressed into the corresponding sockets 18 during assembly of the rail fastening device.

The width of the rail pad 20 is less than the spacing between the bases 13 of the respective clips 12. In use, the rail 10 may not sit exactly between the clips 12. However, the shorter ribs 21 allow the lateral position of the rail pad 20 to be varied by sliding the rail pad 20 along the sockets 18, so that the rail pad 20 always sits completely under the rail in a manner where it does not extend laterally outwardly of the rail 10. The displaceable cap portions 14 of the clips 12 comprise inner front faces 22 which abut and displace the rail pad 20 as the cap portions 14 are laterally adjusted to engage the flange 10F of the rail 10.

In use, the rail pad 20 acts to prevent any vibrations from the rail 10 from being transmitted to the ground or other support structure. When the wheels of a crane pass over the rail fastening device, the substantial load will compress the rail pad 20 but the engagement of the ribs 21 and the recesses 18 hold the rail pad 20 firmly in situ.