Expansion anchor
US4770581A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1985 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Dec 19, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B13/045
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A unitary thick walled spacer S supports an anchor rod (15) for engagement in an expansion body (6). The tubular spacer S has a first part P of greater diameter than its remaining part P', with the part P' in slide fit engagement in the expansion sleeve (1), and the part P abutting, at its free end, a washer (17) and the head of the anchor rod (15). An annular rim M formed between the parts P and P' of the spacer S, is arranged, prior to use, a distance X from the expansion sleeve (1). As clamping down is performed in a receiving socket, the spacer part P' slides inside the expansion sleeve so progressively closing the gap X. The arrangement is so designed that in any particular application, the rim M at most just barely comes into contact with the expansion sleeve (1) so avoiding uselessly and detrimentally loading the spacer S.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.