GB2075580A

GB2075580A - Securing railway rails

Info

Publication number: GB2075580A
Application number: GB8113325A
Authority: GB
Original assignee: Pandrol Ltd
Current assignee: Pandrol Ltd
Priority date: 1980-05-06
Filing date: 1981-04-30
Publication date: 1981-11-18

Abstract

A railway rail-fastening clip consisting of a bent metal bar has been formed preferably before bending of the bar, with a chamfer 6 at the free end of leg 1 of the bar. The chamfer 6 preferably extends round the entire circumference of its bar end and can facilitate the driving of that bar end under an anchorage. The other end of the bar has preferably also, before bending of the bar, been formed with an identical chamfer 6, so that there is no risk of the bending operation producing a clip with a chamfer only at the wrong end of the bar. <IMAGE>

Description

SPECIFICATION Railway rail-fastening clips According to the invention, there is provided a railway rail-fastening clip which consists of a bent metal bar and has a substantially straight leg which in use is to press upwardly on a surface of an anchorage for the clip, one end of the leg being one end of the bar, the clip also having a further portion which is to bear downwardly on the rail flange or on some thing (for example a fish-plate) secured to the rail, said end of the leg being provided with a chamfer at least on the side thereof which is to be uppermost when the clip is in use, in order to facilitate driving of the clip, with said end foremost, into its desired position.

If the bar is of circular cross-section, the chamfer preferably extends at least over an arc which subtends an angle of 90 at the axis of the bar, the mid point of the arc being at the top of said end of the leg.

The chamfer may be applied to the bar after bending it to form the clip. Alternatively, it may be applied before the bending operation, in which case it is preferable for the chamfer to extend around the entire circumference of the said end of the leg so that there is no need to turn the bar about its axis to any particular position before bending operation. It is better still to apply the chamfer all round the circumference of both ends of the bar before the bending operation, so that there is no danger of an operator's error having the result that there is in the finished clip a chamfer only at the wrong end of the bar.

The clip may, for example, be a so-called "P-R clip" such as is disclosed in British Patent Specification No. 861,473 (the inven tor was a Mr. Pande-Rolfsen) or No. 869,385 (Figs. 1 to 3), or it may be a so-called "flat toe P-R clip" as disclosed in British Patent Specification No. 1,213,762 (Figs. 4 to 6).

Alternatively, the clip may be a so-called "short-heel P-R clip", such as is disclosed in British Patent Specification No. 1,497,908 or a so-called "e-clip", such as is disclosed in British Patent Specification No. 1,510,224.

An example in accordance with the inven tion is described below with reference to the accompanying drawings, in which: Figure 1 shows a side view of a so-called "flat-toe P-R clip", taken as indicated by the arrow I in Fig. 2, Figure 2 shows an end view of the clip, Figure 3 shows another side view of the clip, taken as indicated by the arrow Ill in Fig.

2, and Figure 4 shows in detail one end of the clip.

Figs. 1 to 3 are identical to Figs. 4 to 6 of British Patent Specification No. 1,213,762, except as regards the ends of the bar which is used to make the clip. They show a clip made by bending a resilient steel bar of circular cross-section and at least 0.8 mm. thick so that it comprises first to fifth portions 1 to 5 as described in Specification No. 1,213,762, with the third portion 3 being formed on its under-side with a flat surface 9A extending over a length 9B.

In accordance with the invention, each end of the bar is given a chamfer, before the bar is bent to form the clip, the chamfer extending all round the circumference of the bar.

The surface of the chamfer may conveniently have the shape of the surface of a frustum of a cone, as shown in Fig. 4, having a halfangle xof between 10" and 45 , preferably about 25 and the length L of the chamfer is conveniently between 0.05 and 0.5 times, preferably about 0.1 times, the diameter of the bar. Both ends of the bar are preferably identical so that it does not matter which end is used to make the leg 1, when the clip is driven into its intended position in an assembly according to Figs. 1 to 3 of Specification No. 1,213,762, makes it easier to drive the clip into position.

1. A railway rail-fastening clip which consists of a bent metal bar and has a substantially straight leg which in use is to press upwardly on a surface of an anchorage for the clip, one end of the leg being one end of the bar, the clip also having a further portion which is to bear downwardly on the rail flange or on something (for example a fish-plate) secured to the rail, said end of the leg being provided with a chamfer at least on the side thereof which is to be uppermost when the clip is in use, in order to facilitate driving of the clip, with said end foremost, into its desired position.

2. A clip as claimed in claim 1, wherein said bar is of circular cross-section and said chamfer extends at least over an arc which subtends an angle of 90 at the axis of the bar, the mid-point of said arc being at the top of said side of said end of the leg.

3. A clip as claimed in claim 1 or 2, wherein said chamfer extends round the entire circumference of said end of the leg.

4. A clip as claimed in any preceding claim, wherein the surface of the chamfer is at an angle of between 10 and 45 to the axis of said one end of said bar.

5. A clip as claimed in claim 4, wherein said angle is about 25 .

6. A clip as claimed in any preceding claim, wherein said chamfer is of a length along the bar of between 0.05 and 0.5 times the width of the bar.

7. A clip as claimed in claim 6, wherein said length is about 0.1 times the width of the bar.

8. A clip as claimed in any preceding claim, wherein the other end of the bar is

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Railway rail-fastening clips According to the invention, there is provided a railway rail-fastening clip which consists of a bent metal bar and has a substantially straight leg which in use is to press upwardly on a surface of an anchorage for the clip, one end of the leg being one end of the bar, the clip also having a further portion which is to bear downwardly on the rail flange or on some thing (for example a fish-plate) secured to the rail, said end of the leg being provided with a chamfer at least on the side thereof which is to be uppermost when the clip is in use, in order to facilitate driving of the clip, with said end foremost, into its desired position. If the bar is of circular cross-section, the chamfer preferably extends at least over an arc which subtends an angle of 90 at the axis of the bar, the mid point of the arc being at the top of said end of the leg. The chamfer may be applied to the bar after bending it to form the clip. Alternatively, it may be applied before the bending operation, in which case it is preferable for the chamfer to extend around the entire circumference of the said end of the leg so that there is no need to turn the bar about its axis to any particular position before bending operation. It is better still to apply the chamfer all round the circumference of both ends of the bar before the bending operation, so that there is no danger of an operator's error having the result that there is in the finished clip a chamfer only at the wrong end of the bar. The clip may, for example, be a so-called "P-R clip" such as is disclosed in British Patent Specification No. 861,473 (the inven tor was a Mr. Pande-Rolfsen) or No. 869,385 (Figs. 1 to 3), or it may be a so-called "flat toe P-R clip" as disclosed in British Patent Specification No. 1,213,762 (Figs. 4 to 6). Alternatively, the clip may be a so-called "short-heel P-R clip", such as is disclosed in British Patent Specification No. 1,497,908 or a so-called "e-clip", such as is disclosed in British Patent Specification No. 1,510,224. An example in accordance with the inven tion is described below with reference to the accompanying drawings, in which: Figure 1 shows a side view of a so-called "flat-toe P-R clip", taken as indicated by the arrow I in Fig. 2, Figure 2 shows an end view of the clip, Figure 3 shows another side view of the clip, taken as indicated by the arrow Ill in Fig. 2, and Figure 4 shows in detail one end of the clip. Figs. 1 to 3 are identical to Figs. 4 to 6 of British Patent Specification No. 1,213,762, except as regards the ends of the bar which is used to make the clip. They show a clip made by bending a resilient steel bar of circular cross-section and at least 0.8 mm. thick so that it comprises first to fifth portions 1 to 5 as described in Specification No. 1,213,762, with the third portion 3 being formed on its under-side with a flat surface 9A extending over a length 9B. In accordance with the invention, each end of the bar is given a chamfer, before the bar is bent to form the clip, the chamfer extending all round the circumference of the bar. The surface of the chamfer may conveniently have the shape of the surface of a frustum of a cone, as shown in Fig. 4, having a halfangle xof between 10" and 45 , preferably about 25 and the length L of the chamfer is conveniently between 0.05 and 0.5 times, preferably about 0.1 times, the diameter of the bar. Both ends of the bar are preferably identical so that it does not matter which end is used to make the leg 1, when the clip is driven into its intended position in an assembly according to Figs. 1 to 3 of Specification No. 1,213,762, makes it easier to drive the clip into position. CLAIMS

5. A clip as claimed in claim 4, wherein said angle is about 25 .

8. A clip as claimed in any preceding claim, wherein the other end of the bar is provided with a chamfer substantially identical to the first-mentioned chamfer.

9. A railway rail-fastening clip, substantially as hereinbefore described with reference to the accompanying drawing.