Patent US3961410A successfully refreshed from Google Patents.
US3961410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Masonry anchor extractor tool
Assignee: Individual
•
Filing: 1974-10-07
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Granted: 1976-06-08
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Expires: 1994-10-07
Abstract
Abstract The disclosed extractor tool cleanly and easily removes "Phillips" anchors and similar elements previously installed in masonry walls. First an inner bolt of the tool is threaded into the installed anchor sufficiently to separate the anchor from its expander plug. Then a nut about the inner bolt is turned, bearing on an outer collar to withdraw the bolt and the attached anchor from the wall.
Inventors
- 👤 Donald K. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:34
CPC Classifications
B; B25; B25B; B25B31/00; B25B27/00; B25B27/02; B25B27/023; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53796; Y10T29/53848; Y10T29/53987
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
197 words
An extractor tool to remove a masonry anchor or the like from a cavity in a masonry structure, the masonry anchor including a cylindrical anchor with internal threads, the anchor when installed being wedged into the side walls of the cavity by an expander plug seated in the cavity, the extractor tool including means to axially separate the anchor from its expander plug, said means including a bolt with a threaded shaft for mating with the inernal threads in the cylindrical anchor, the bolt shaft having a reduced outer end to provide a stud portion, the stud forcing the expander plug from the cylindrical anchor as the shaft is threaded into the cylindrical anchor and means to extract the separated anchor from the cavity, said extracting means including a collar member about the bolt and a nut threaded onto the bolt shaft and positioned between the bolt and the end of the collar member whereby when the bolt shaft is threaded into an anchor, the nut may be screwed down to bear on the collar, the collar in turn bearing on the masonry structure and exerting sufficient force as the nut is turned to withdraw the anchor.
Claim 2
Dependent Claim
197 words
An extractor tool to remove a masonry anchor or the like from a cavity in a masonry structure, the masonry anchor including a cylindrical anchor with internal threads, the anchor when installed being wedged into the side walls of the cavity by an expander plug seated in the cavity, the extractor tool including means to axially separate the anchor from its expander plug, said means including a bolt with a threaded shaft for mating with the inernal threads in the cylindrical anchor, the bolt shaft having a reduced outer end to provide a stud portion, the stud forcing the expander plug from the cylindrical anchor as the shaft is threaded into the cylindrical anchor and means to extract the separated anchor from the cavity, said extracting means including a collar member about the bolt and a nut threaded onto the bolt shaft and positioned between the bolt and the end of the collar member whereby when the bolt shaft is threaded into an anchor, the nut may be screwed down to bear on the collar, the collar in turn bearing on the masonry structure and exerting sufficient force as the nut is turned to withdraw the anchor.
Claim 3
Dependent Claim
20 words
An extractor tool as set forth in claim 1 including magnetic means to extract the expander plug with the anchor.
Claim 4
Dependent Claim
84 words
An extractor tool as set forth in claim 1 in which the extracting means includes a collar member about the bolt and a nut threaded onto the bolt shaft in position between the bolt and the end of the collar member whereby when the bolt shaft is threaded into an anchor, the nut may be screwed down to bear on the collar, the collar in turn bearing on the masonry structure and exerting sufficient force as the nut is turned to withdraw the anchor.
Claim 5
Dependent Claim
35 words
An extractor tool as set forth in claim 1 including bearing means between the nut and the adjacent end of the collar to permit free rotation of the nut against the end of the collar.
Claim 6
Dependent Claim
34 words
An extractor tool as set forth in claim 4 in which the nut and the collar are integral with the bearing means to interconnect all the components of the tool as a single unit.
Claim 7
Dependent Claim
32 words
An extractor tool as set forth in claim 3 in which the collar is cylindrical, the inner diameter of the collar being sufficient to receive the anchor as it is being extracted.
Claim 8
Dependent Claim
40 words
An extractor tool as set forth in claim 6 in which the end of the collar adjacent the slab is substantially enlarged to distribute the bearing force as the anchor is extracted over a substantial area of the masonry structure.
References Cited (Backward Citations)
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US1382835A
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US1496134A
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US2305076A
Cited
US3096574A
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US3200692A
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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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |