Fasteners and spacer rings therefor
AssigneeTechnofast Industries Pty. Ltd.
InventorsJohn Wentworth Bucknell, Robert Wentworth Bucknell
Life of this patent
Estimating the term…
Abstract
An axially expanding spacer (10) has respective first and second spacer rings (11,12) with complementary helical ramped faces (16,17) and abutment faces (18,19). By relative rotation of the spacer rings (11,12), the height of the spacer (10), between annular faces (14,15) can be expanded or contracted. Compression springs (20) between the abutment faces (18,19) urge the spacer (10) to its “expanded” configuration.
Claims16
An expanding spacer to be mounted, about a bolt being tensioned, between a nut engaged with the bolt and with a component to be clamped, the expanding spacer having complementary first and second spacer rings, each of the spacer rings having a planar end face and helically ramped faces terminated by abutment faces, where the angle of inclination of the helically ramped faces to the planar end faces is selected so that there will be no relative rotational motion between the first and second spacer rings when the expanding spacer is interposed between the nut and the component, and a compressive load is applied to the expanding spacer.
An expanding spacer, to be mounted about a bolt being tensioned, incorporating a nut engageable with the bolt, and a spacer ring with a planar face engageable with a component to be clamped, the nut and the spacer ring having complementary helically ramped faces terminated by abutment faces, where the angle of inclination of the ramped faces to the planar end face of the spacer ring selected so there will be no relative rotation or motion between the nut and the spacer ring when the expanding spacer is subject to a compressive load.
An expanding spacer, to be mounted about a bolt being tensioned, incorporating a nut engageable with the bolt, and a spacer ring with a planar face engageable with a component to be clamped;
- the nut and spacer ring having complementary respective external and internal screw threads to enable expansion and contraction of the expanding spacer by relative rotation of the spacer ring to the nut.
An expanding spacer, wherein:
- the nut has secondary, optionally tapered, screw threads for engagement with a puller bar of a tensioning device.
Dependencies are inferred from the claim text.