WE CLAIM:
1. A method of manufacturing a resilient rail clip comprising bending a rod, made of
metal having a hardness value falling within a known hardness value range, into a
5 predetermined shape and then SUbjecting the bent rod to a cold setting process in
order to induce in the bent rod a predetermined amount of permanent set, wherein the
cold setting process comprises:
applying a first load to part of the bent rod so as to cause a first amount of
deflection of that part of the bent rod, which first load is a predetermined load having a
10 value equal to or greater than that required to reach the yield point of metal having the
highest hardness value in the said hardness value range;
measuring the first amount of deflection of the said part of the bent rod achieved
by applying the predetermined first load;
determining, on the basis of the measured deflection amount, either (i) a second
15 load, which, when applied to the said part of the bent rod, will cause the bent rod to
acquire the predetermined amount of permanent set, or (ii) a second amount of
deflection of the said part of the bent rod required in order to bring about in the bent rod
the predetermined amount of permanent set; and
applying the determined second load to the said part of the bent rod or deflecting
20 the said part of the bent rod by the determined second amount of deflection.
2. A method of manufacturing a resilient rail clip comprising bending a rod,
made of metal having a hardness value falling within a known hardness value range,
into a predetermined shape and then subjecting the bent rod to a cold setting process
25 in order to induce in the bent rod a predetermined amount of permanent set, wherein
the cold setting process comprises:
deflecting part of the bent rod by a predetermined first amount by applying a first
load having a value equal to or greater than that required to reach the yield point of
metal having the highest hardness value in the said hardness value range;
30 measuring the amount of the first load required to achieve the predetermined first
amount of deflection;
determining, on the basis of the measured first load, either (i) a second deflection
amount required in order to bring about in the bent rod the predetermined amount of
permanent set, or (ii) a second load, which, when applied to the said part of the bent
35 rod, will cause the bent rod to acquire the predetermined amount of permanent set; and
7
deflecting the said part of the bent rod by the determined second deflection
amount or applying the determined second load to the said part of the bent rod.
Dated this day
8
of JUI~ 2012.
F. S. GROSER
of GROSER & GROSER
AGENT FOR THE APPLICANTS