US4640654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anchor
Assignee: FISCHER-WERKE ARTUR FISHER & Co KG D-7244 TUMLINGGEN/WALDACHTAL GERMANY GmbH
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Filing: 1985-06-03
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Granted: 1987-02-03
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Expires: 2005-06-03
Abstract
Abstract An anchor for fastening in bore holes comprises an expander body driven into an expansion sleeve, having a slotted expansible portion, by a stay bolt to which a torque is applied to draw the expander body into the expansion sleeve. The expander body has at its trailing end a conical portion which merges into a concavely-curved portion. The angle of the concavity of the curved portion at the leading end of the expander body corresponds to a double angle of inclination of the conical portion to the central axis of the anchor.
Inventors
- 👤 Artur Fischer
- 👤 Jurgen Onasch
- 👤 Manfred Haage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B13/063; F16B13/066; F16B13/065
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
An anchor for fastening in bore holes formed in support structures, comprising an expansion sleeve having a leading end; an expander body positioned at said leading end of said expansion sleeve and including a conical portion; a stay bolt having an abutment with gripping surfaces for applying a torque thereto, said bolt being inserted into said sleeve and engaged with said expander body for driving said expander body into said sleeve; and an intermediate sleeve positioned between said abutment and said expansion sleeve, said expander body further including a concavely-curved portion, said conical portion immediately tangentially merging at a greater diameter thereof into said concavely-curved portion, said concavely-curved portion forming at a leading end of said expander body a tangent line which extends at an angle to a central axis of the anchor, said angle approximately corresponding to a double angle of inclination of said conical portion to said central axis.
Claim 2
Dependent Claim
151 words
An anchor for fastening in bore holes formed in support structures, comprising an expansion sleeve having a leading end; an expander body positioned at said leading end of said expansion sleeve and including a conical portion; a stay bolt having an abutment with gripping surfaces for applying a torque thereto, said bolt being inserted into said sleeve and engaged with said expander body for driving said expander body into said sleeve; and an intermediate sleeve positioned between said abutment and said expansion sleeve, said expander body further including a concavely-curved portion, said conical portion immediately tangentially merging at a greater diameter thereof into said concavely-curved portion, said concavely-curved portion forming at a leading end of said expander body a tangent line which extends at an angle to a central axis of the anchor, said angle approximately corresponding to a double angle of inclination of said conical portion to said central axis.
Claim 3
Dependent Claim
19 words
The anchor as defined in claim 1, wherein the angle of inclination of said conical portion is about 6°.
Claim 4
Dependent Claim
31 words
The anchor as defined in claim 1, wherein said expansion sleeve has at said leading end a circular saw tooth-shaped groove which tapers towards a trailing end of the expansion sleeve.
Claim 5
Dependent Claim
49 words
The anchor as defined in claim 1, wherein said expansion sleeve has in an outer surface thereof, in the region of said leading end a circular groove; and further including a spring ring positioned in said circular groove and extending radially beyond an outer surface of the expansion sleeve.
Claim 6
Dependent Claim
20 words
The anchor as defined in claim 4, wherein said spring ring tapers towards a trailing end of the expansion sleeve.
Claim 7
Dependent Claim
27 words
The anchor as defined in claim 1, wherein said intermediate sleeve is made of plastics and forms a bearing zone between said abutment and said expansion sleeve.
Claim 8
Dependent Claim
25 words
The anchor as defined in claim 1, said further including a spacer sleeve positioned on said stay bolt between said abutment and said intermediate sleeve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |