Abstract: A twisted helically-shaped member (15) in the form of a twisted tie, twisted fastener, twisted wire or twisted rod; said twisted helically-shaped member (15) having an axial core (12) and a plurality of helical threads (13H) extending along the axial core (12); and wherein a variation in lead measurements along the length of at least one helical thread (13H), is less than a variation in pitch measurements along the lengths of the helical threads (13H); wherein the axial core (12) has a transverse cross-sectional area comprising two-fifths or less of the transverse circumscribed cross-sectional area of the helical threads (13H).

Abstract: Method and means of manufacturing ties, fasteners and rods (15) having a plurality of longitudinal threads by forcing a coil of roll-profiled feed-wire made of steel (11) through a twisting-die made of plastic (1). Also described is: a twisting-die made of plastic (1) that is suitable for twisting profiled feed-wire (11) made of steel; a method of forming a plastic twisting die (1) using an driven tap (31) in the form of a twisted rod (15); and a helically-shaped member (15) having lead measurements (X) along the length of the helical thread that vary less than pitch measurements (Y) along the lengths of the helical threads.

Abstract: A twisted helically-shaped member (15) in the form of a twisted tie, twisted fastener, twisted wire or twisted rod; said twisted helically-shaped member (15) having an axial core (12) and a plurality of helical threads (13H) extending along the axial core (12); and wherein a variation in lead measurements along the length of at least one helical thread (13H), is less than a variation in pitch measurements along the lengths of the helical threads (13H); wherein the axial core (12) has a transverse cross-sectional area comprising two-fifths or less of the transverse circumscribed cross-sectional area of the helical threads (13H).

Abstract: Method and means of manufacturing ties, fasteners and rods (15) having a plurality of longitudinal threads by forcing a coil of roll-profiled feed-wire made of steel (11) through a twisting-die made of plastic (1). Also described is: a twisting-die made of plastic (1) that is suitable for twisting profiled feed-wire (11) made of steel; a method of forming a plastic twisting die (1) using an driven tap (31) in the form of a twisted rod (15); and a helically-shaped member (15) having lead measurements (X) along the length of the helical thread that vary less than pitch measurements (Y) along the lengths of the helical threads.

Abstract: The present invention utilises impact-driven fastener (1) having a twisted body having: a common axial core (2) a protruding helix (3) and a trailing elongate lost-end driving shank: (4) of reduced radial diameter. The fastener incorporates two or three loosely wound loosely wound thread-cutting blade-like helical projections (5) extending radially from a solid axial core (2). These blade-like projections (5) are inclined upon a sweeping helical angle (8) of less than 42° to the longitudinal axis (9) of the core (2).

Abstract: A connecting device includes an axial core and a plurality of helical projections that extend radially from the core. The core has a cross section comprising two-fifths or less of the circumscribed cross sectional area of the device and the accuracy of the pitch of the helical projections varies by no more than 0.5% from any given probate pitch along the axis of the device. Another connecting device includes an axial core and two or three helical fins projecting radially from the core, wherein the core has a cross section comprising two-fifths or less of the circumscribed cross sectional area of the device, the accuracy of the pitch of the helical fins varies by no more than 0.5% from any given probate pitch along the axis of the device and wherein the root of the fin material includes a radiused surface.

Abstract: The present invention utilises impact-driven fastener (1) having a twisted body having: a common axial core (2) a protruding helix (3) and a trailing elongate lost-end driving shank: (4) of reduced radial diameter. The fastener incorporates two or three loosely wound loosely wound thread-cutting blade-like helical projections (5) extending radially from a solid axial core (2). These blade-like projections (5) are inclined upon a sweeping helical angle (8) of less than 42° to the longitudinal axis (9) of the core (2).

Abstract: A connecting device includes an axial core and a plurality of helical projections that extend radially from the core. The core has a cross section comprising two-fifths or less of the circumscribed cross sectional area of the device and the accuracy of the pitch of the helical projections varies by no more than 0.5% from any given probate pitch along the axis of the device. Another connecting device includes an axial core and two or three helical fins projecting radially from the core, wherein the core has a cross section comprising two-fifths or less of the circumscribed cross sectional area of the device, the accuracy of the pitch of the helical fins varies by no more than 0.5% from any given probate pitch along the axis of the device and wherein the root of the fin material includes a radiused surface.

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.

Abstract: A rotary drive mechanism for use as a motor, pump or compressor. The mechanism includes a housing having a chamber defined by a peripheral wall. A rotor is rotatably mounted in the chamber and has two longitudinal seal edges in contact with the wall. The rotor is mounted for rotation about a rotation axis and for sliding movement relative to the axis in a direction generally perpendicular thereto. The axis is offset from the center of the chamber.

Abstract: A rotary drive mechanism for use as a motor, a pump or a compressor includes a housing (13) having a chamber (1) therein defined by a peripheral wall. A rotor (3) is rotatably mounted in the chamber (1) and has two longitudinal seal edges (5) that contact the profiled wall. The rotor (3) is mounted for rotation about a rotation axis (9) and for sliding movement relative to the rotation axis in a direction perpendicular thereto. The rotation axis (9) is offset form the centre of the chamber.

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.