Patent ID: 6318939
Filing Date: 2001-11-20
Classification: E01B,F16B

Abstract:
A fastening device (20) for use in holding a base plate down to a railway sleeper, the device (20) having a head portion (21), a screw-threaded shank portion (22) and an intermediate portion (23) connecting the head portion (21) to the screw-threaded shank portion (22), the intermediate portion (23) and the screw-threaded shank portion (22) being of smaller diameter than the head portion (21); characterized in that a spring washer (15) is retained on the device (20) prior to use, regardless of the orientation of the device (20), by means of a washer-retaining part (23b) provided on said intermediate portion (23) adjacent to said head portion (21), said washer-retaining part (23b) having a larger external diameter than a part (23a) of said intermediate portion (23) adjacent to said screw-threaded shank portion (22), and said external diameter of said washer-retaining part (23b) being uniform along substantially its entire axial length, said spring washer (15) having an internal diameter sized so as to enable said spring washer (15) to be held resiliently on said washer-retaining part (23b).