US3884099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion bolt
Assignee: Individual
•
Filing: 1973-04-11
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Granted: 1975-05-20
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Expires: 1993-04-11
Abstract
Abstract An expansion bolt has a clamping screw and a tapered expansion member threaded on the screw and actuating a number of clamping jaws which are held in axial engagement with an axial stop member on the screw. The expansion member may be screwed to a position in which it engages the stop member and in this position further expansion is permitted of the jaws to a maximum expanded position which is defined by cooperating abutment surfaces on the expansion body and the jaws.
Inventors
- 👤 Karl Birger Sikstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:11
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B13/063; F16B13/066; F16B13/068; E; E21; E21D; E21D21/00; E21D21/008
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
282 words
An expansion bolt comprising a threaded claimping screw, a tapered expansion member having a tapped bore threadedly engaging the screw and having at least one outer wedge surface and a number of clamping jaws having each of its inner wedge surfaces cooperating with an outer wedge surface of the tapered expansion member, the jaws being retained in engagement with the tapered expansion member by means of an elastic member and in abutment at one of their enDs with an axial stop member on the screw when the jaws are held against rotation and the screw is rotated for axial displacement of the expansion member in a direction towards the axial stop member at the same time as the jaws by cooperation between the outer and inner wedge surfaces will be moved radially outwardly, characterized in that one of the wedge surfaces of at least a pair of cooperating outer and inner wedge surfaces is provided with a radial projection which is guided in a corresponding longitudinal groove in the outer wedge surface, that the projection is formed with a substantially radial end surface adapted to form an abutment surface, and that the groove has a corresponding abutment surface at one of its ends, there being provided a predetermined free axial space or distance between said abutment surfaces when the tapered expansion member has been screwed relative to the claimping screw so far that the conical member abuts the axial stop member on the screw and prevented from further screwing relative to the expansion member, whereby subsequent simultaneous axial movement of the screw and the expansion member relative to the jaws until the abutment surfaces engage one another expands the jaws still further.
Claim 2
Dependent Claim
44 words
An expansion bolt according to claim 1 having at least two coaxial groups of outer and inner wedge surfaces arrayed along the same axis and characterized in that said projections are provided at least in connection with one of said groups of wedge surfaces.
Claim 3
Dependent Claim
27 words
An expansion bolt according to claim 1, characterized in that the wedge surfaces are flat and form an acute angle with the longitudinal axis of the bolt.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |