Fastening device

Details Fastening device Fastening device

2000-04-14

2001-11-20

Wilson, Neill (Department: 3627)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Threaded fastener locked to a discreet structure

Member or portion thereof located between substructure and...

C411S157000, C411S533000, C411S544000

Reexamination Certificate

active

06318939

ABSTRACT:

The present invention relates to a fastening device for use in holding a base plate down to a railway sleeper, and in particular to the type of fastening device having a head and a screw-threaded shank, commonly known as a screwspike which is used on wooden sleepers.
BACKGROUND OF THE INVENTION
Screwspikes are used quite widely in Europe, and to an increasing extent in the United States of America. They have some advantages over older types of rail fastenings known as “cutspikes” and “lockspikes” in that, because the screwspike has a narrow threaded shank, screwspikes have less tendency to work loose during use. Many railway authorities believe that this tendency can be further reduced by placing a spring washer under the head of the screwspike, so that a modest load is always applied to the thread of the screw during use.
BRIEF SUMMARY OF THE INVENTION
According to an embodiment of the present invention there is provided a fastening device for use in holding a base plate down to a railway sleeper, the device having a head portion, a screw-threaded shank portion and an intermediate portion connecting the head portion to the screw-threaded portion, the intermediate portion and the screw-threaded portion being of smaller diameter than the head portion, and the device being adapted to retain a spring washer on the said intermediate portion prior to use regardless of the orientation of the device.
Preferably the spring washer is retained by means of a washer-retaining part provided on the intermediate portion adjacent to the head portion, which washer-retaining part is of larger diameter than the part of that intermediate portion adjacent to the screw-threaded shank portion. The washer-retaining part may be of uniform external diameter along substantially its entire length, preferably such that the external diameter is approximately the same as the internal diameter of the spring washer to be retained thereon.


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