GB2170536A

GB2170536A - Rail fastening systems

Info

Publication number: GB2170536A
Application number: GB08602376A
Authority: GB
Inventors: Hartley Frank Young
Original assignee: Ralph McKay Ltd
Current assignee: Ralph McKay Ltd
Priority date: 1985-02-01
Filing date: 1986-01-31
Publication date: 1986-08-06
Also published as: GB8602376D0; GB2170536B

Abstract

An elastic rail fastening system for use with wooden rail ties 9 includes a rail 4 seated on a rail plate 6 which in turn is secured to the wooden rail tie by two pairs of spikes 10. Each spike has a recess 13 which receives the base 5 of a rail clamp. The rail plate 6 has an upstanding rib 7 extending parallel to the rail flange and between each pair of spikes. The base of the rail clamp abuts the rail plate rib before it contacts the end of the recess which is adjacent the rail. <IMAGE>

Description

SPECIFICATION Rail fastening systems This invention relates to improvements in rail fastening systems particularly a rail fastening system used on wooden sleepers.

Australian Patent 537,442 proposed a novel approach to fastening systems for wooden rail ties whereby a rail plate is provided to lie between the rail tie and the rail support plate is held in position by a pair of attachment means which also hold the elastic rail fasteners in position at right angles to the rails longitudinal direction. The base of the rail fastener seats in opposed recesses of the shoulders of the pair of attachment pegs.

To assemble the rail seat the rail plate is secured in position by the attachment spikes, the rail laid on the support plate between two pairs of attachment means, and two rail fasteners are driven onto the rail flange into the recesses of the attachment means. To force the rail fastener base into the recesses and to carry the bearing portion of the fastener onto the rail flange it is conventional to hammer the fastener into position. A problem has arisen where the person applying the fastener hammers excessively after the fastener is in position. The consequence of such excessive hammering can be the fracture of one or both of the shoulder portions of the attachment means because the base of the rail fastener is driven into the end of the slot in the shoulder of the attachment means which transmits excess hammering force to the spike.

When one attachment spike is fractured it means that a whole rail tie is non functional and it is costly and inconvenient to replace the broken spike.

It is an object of this invention to modify the rail fastening system of Australian Patent 537,442 to avoid this problem.

To this end the present invention provides a rail fastening system comprising a wooden rail tie, a rail having a longitudinal axis, a rail plate positioned between the tie and the rail, two pairs of attachment means associated with each rail plate, each pair being located on opposite sides of the rail and each attachment means is alongside of the rail to secure the plate to the wooden tie, each attachment means including a recess and further having located below said recess, a spike portion extending through the plate and into the tie, and an elastic rail clamp associated with each pair of attachment means, the clamp having one portion lying on the rail flange and another portion held within opposed facing recesses of the associated pair of attachment means wherein the rail plate incorporates an upstanding rib lying between the two attachment means adjacent the rail and the recess in each attachment means is arranged so that the base of the rail clamp abuts said rib of the rail plate before it abuts the end of the recess lying adjacent to the rail.

Basically the rail fastening system is a modification of the system of Australian Patent 537,442. By redesigning the components of the system to ensure the base of the clamp does not abut the end of the recess in the attachment means, accidental hammering of the clip cannot result in fracture of the attachment spike. Impact will occur against the rail plate instead.

As in patent 537,442 it is preferred that the rail clamp incorporates two elastic arms which lie on the rail flange said arms being integral with a base portion the side edges of which are laterally disposed to said rail and interfit with the complementary recesses in each one of said pair of attachment means.

Preferably the attachment means is in the form of a peg and formed by forging from metal bar or by casting, to have shoulders on one end defining said recess and said spike portion extending between said one end and the opposite end thereof. The recess is generally in the form of a slot open at both ends dimensioned to receive the edge of the base portion of the rail clamp.

A preferred form of the invention will now be described with reference to the drawings.

Figure 1 is a plan view of a rail seat for a wooden rail tie and Figure 2 is a sectional view along the rail of such a rail seat.

Figure 3 shows a perspective view of two pairs of attachment means as positioned in a rail seat.

The rail 4 sits on a rail plate 6 which is fastened to the wooden rail tie 9 by the attachment of spikes 10. The spikes 10 extend through complementary holes in the rail plate 6 and the tie attachment portion 12 extend into the wooden tie 9. The rail clamp securing portion 11 lies above the rail plate 6.

The bases 15 of the rail clamps 14 lie within the slots 13 of the pairs of attachment means 10 A and B or 10 C and D.

The toe portions 16 of rail clamps 14 bear down on rail flange 5 to secure the rail 4 in place on the tie 9.

In its normal position on the rail flange 5 the rail clamp 14 is positioned so that the base 15 lying in slots 13 terminates in front of the upstanding rib 7 of rail plate 6. The ribs 7 locate the base of the rail 4 on the rail plate 6. Each of the slots 13 in attachment means 10A, 10B, 10C and 10D terminates in face 18. Each attachment means 10 is so located on rail plate 6 that the end of the base 15 of rail clamp 14 will abut the rib 7 of rail plate 6 before it abuts face 18 at the end of each slot 13. Another important design feature is that the clamp receiving portion does not protrude rearwardly further than the rail clamp 14 so that any blow struck against the rail clamp cannot also strike the receiving por tion 11 of the attachment means.

From the above it can be seen that this invention provides a means of avoiding fracture of the attachment means used with wooden rail ties.

Claims

1. A rail fastening system comprising a wooden rail tie, a rail having a longitudinal axis, a rail plate positioned between the tie and the rail, two pairs of attachment means associated with each rail plate, each pair being located on opposite sides of the rail and each attachment means is alongside of the rail to secure the plate to the wooden tie, each attachment means including a recess and further having located below said recess, a spike portion extending through the plate.and into the tie, and an elastic rail clamp associated with each pair of attachment means, the clamp having one portion lying on the rail flange and another portion held within opposed facing recesses of the associated pair of attachment means wherein the rail plate incorporates an upstanding rib lying between the- two attachment means adjacent the rail and the recess in each attachment means is arranged so that the base of the rail clamp abuts said rib of the rail plate before it abuts the end of the recess lying adjacent to the rail.

2. A rail fastening system as claimed in claim 1 in which said upstanding rib extends between each pair of attachment means parallel to the rail edge and the two ribs on each rail plate together also serve to locate the rail in its correct position.

3. A rail fastening system as claimed in claim 1 wherein the recess in each attachment means is in the form of an open ended slot dimensioned to receive the edge of the base portion of a rail clamp.

4. A rail fastening system substantially as specifically herein described with reference to the accompanying drawings.