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US 7,269,987 B2Granted
Method of manufacturing connecting devices
OwnerWilliam Henry Ollisinventor
Life of this patent
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Abstract
The invention relates to a method of manufacturing a connecting device having common axial core material and a plurality of helical fins, flanges or ridges that extend outwards from the core. The method uses an elongate preform member, and comprises forcing the preform member in the axial direction of its core through a helical deformation arrangement (22) in order to deform the preform member helically.
Claims22
A method of manufacturing a helical connecting device, the method comprising:
- forcing an elongate preform member through a helical deformation arrangement in order to deform the preform member helically, wherein the preform member includes a plurality of weakened zones;
- and,
- breaking the deformed preform member at the weakened zones to provide a plurality of connecting devices.
A method of manufacturing helical connecting devices, the method comprising:
- forcing an elongate preform member through a helical deformation arrangement in order to deform the preform member helically, wherein the elongate preform member comprises wire and the helical deformation arrangement includes grooved rollers and a twisting die;
- continuously feeding the wire from a coil of the wire through the grooved rollers, wherein the grooved rollers are arranged to produce a profiled wire having first and second fins and first and second stubby reinforcing ribs extending from a central core, each of the first and second fins tapers from a radiused root to a tip and has a larger radial length than the first and second stubby reinforcing ribs, the first and second stubby reinforcing ribs are arranged alternately with the first and second fins, and the maximum cross-sectional width of each of the first and second fins is less than the diameter of the central core of the profiled wire;
- continuously feeding the profiled wire to the twisting die and forcing it there through to produce a helically profiled wire;
- and
- cutting the helically profiled wire to produce helical connecting devices having a helical profile extending along substantially the whole length of an axial core, wherein the accuracy of the pitch of the helical projections formed from the first and second fins varies by no more than 0.5% from any given probate pitch along the axis of the wire.
2 more elements
A method of manufacturing helical connecting devices, the method comprising:
- forcing an elongate preform member through a helical deformation arrangement in order to deform the preform member helically, wherein the helical deformation arrangement comprises a twisting die and the elongate preform member comprises a coil of profiled wire having first and second fins and first and second stubby reinforcing ribs extending from a central core, each of the first and second fins tapers from a radiused root to a tip and has a larger radial length than the first and second stubby reinforcing ribs, the first and second stubby reinforcing ribs are arranged alternately with the first and second fins, and the maximum cross-sectional width of each of the first and second fins is less than the diameter of the central core of the profiled wire;
- continuously feeding the profiled wire to the twisting die and forcing it there through to produce a helically profiled wire;
- and
- cutting the helically profiled wire to produce helical connecting devices having a helical profile extending along substantially the whole length of an axial core, wherein the accuracy of the pitch of the helical projections formed from the first and second fins varies by no more than 0.5% from any given probate pitch along the axis of the wire.
1 more element
Dependencies are inferred from the claim text.