US5401131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion anchor
Assignee: Yoshino Seiki Inc
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Filing: 1993-07-09
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Granted: 1995-03-28
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Expires: 2013-07-09
Abstract
Abstract An expansion anchor including an anchor stem having a holding flange and a lock member having a corrugated portion is inserted into a fitting hole bored in concrete or another rigid material. The anchor is secured in the bore by forcing the lock member to squash the corrugated portion. The corrugated portion thus squashed expands into engagement with the inner surface defining the bore so that the expansion anchor is steadily secured in a non-removable state.
Inventors
- 👤 Yousuke Yoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:55
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/04; F16B13/08; F16B13/0841
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
An expansion anchor to be secured in a fitting hole bored in a rigid object, which comprises: an anchor stem having a leading end and a holding flange attached to said leading end; a cylindrical lock member having a corrugated portion and a straight portion extending backward from said corrugated portion in a direction away from said leading end of the anchor stem, said anchor stem being received in said cylindrical lock member; and a driving collar integral with said straight portion of said lock member, said corrugated portion being squashed and expanded when said lock member is forced toward said holding flange by driving said driving collar, integral with the straight portion of said lock member, toward said holding flange.
Claim 2
Dependent Claim
121 words
An expansion anchor to be secured in a fitting hole bored in a rigid object, which comprises: an anchor stem having a leading end and a holding flange attached to said leading end; a cylindrical lock member having a corrugated portion and a straight portion extending backward from said corrugated portion in a direction away from said leading end of the anchor stem, said anchor stem being received in said cylindrical lock member; and a driving collar integral with said straight portion of said lock member, said corrugated portion being squashed and expanded when said lock member is forced toward said holding flange by driving said driving collar, integral with the straight portion of said lock member, toward said holding flange.
Claim 3
Dependent Claim
29 words
An expansion anchor according to claim 1, wherein said anchor stem has a thread, and further comprising a nut to be screwed to said thread of the anchor stem.
Claim 4
Dependent Claim
36 words
An expansion anchor according to claim 1, wherein said anchor stem has a female threaded portion, and further comprising a male screw or bolt to be screwed into said female threaded portion of the anchor stem.
Claim 5
Dependent Claim
16 words
An expansion anchor according to claim 1, wherein said lock member has a longitudinal expanding slit.
Claim 6
Dependent Claim
18 words
An expansion anchor according to claim 1, wherein said lock member and driving collar are made of metal.
Claim 7
Dependent Claim
21 words
An expansion anchor according to claim 3, wherein said lock member and driving collar are of one body of synthetic resin.
Claim 8
Dependent Claim
18 words
An expansion anchor according to claim 1, wherein said corrugated portion comprises a plurality of ridges and furrows.
References Cited (Backward Citations)
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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) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |