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US 6,318,939 B1Granted
Fastening device
AssigneePandrol Limited
InventorAlain Avaux
Life of this patent
Estimating the term…
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AssigneePandrol Limited
InventorAlain Avaux
Estimating the term…
A fastening device (20), for use in holding a base plate down to a railway sleeper. The device is of the type 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), with the intermediate portion (23) and the screw-threaded shank portion (22) being of smaller diameter than the head portion (21). The intermediate portion (23) at the axial end region thereof adjacent to the head portion (21) has a circumferential part (23b) which has an external diameter somewhat greater than the diameter of the remainder of the intermediate portion (23), and the external diameter of the circumferential part (23b) relative to the internal diameter of a spring washer (15) is such that, when the spring washer is fitted onto and encircles the circumferential part (23b), the spring washer (15) is resiliently retained in place on the intermediate portion (23) prior to use of the device (20), regardless of the orientation of the device.
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);
Dependencies are inferred from the claim text.