Patent US3304828A successfully refreshed from Google Patents.
US3304828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion bolt
Assignee: Individual
•
Filing: 1964-09-18
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Granted: 1967-02-21
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Expires: 1984-09-18
Abstract
No abstract record available.
Inventors
- 👤 Karhu Esko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:26
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/12; F16B13/124; E; E21; E21D; E21D21/00; E21D21/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
AN EXPANSION BOLT ASSEMBLY COMPRISING AN ELONGATED CASING FORMED AS A PAIR OF SPACED COAXIALLY ALIGNED COLLARS AND A PAIR OF SPACED PARALLEL ELONGATED RIGID GUIDE MEMBERS EXTENDING BETWEEN THE COLLARS, ONE OF SAID COLLARS BEING AN OUTER COLLAR AND THE OTHER AN INNER COLLAR, A PAIR OF ELONGATED GRIPPING DOGS ARRANGED BETWEEN THE GUIDE MEMBERS, EACH OF SAID DOGS BEING CONNECTED AT AN END TO THE OUTER ONE OF THE COLLARS FOR PIVOTAL MOVEMENT AWAY FROM AND TOWARDS THE CASING, A THREADED SHAFT ROTATABLY AND SLIDABLY EXTENDING THROUGH THE CASING BETWEEN THE GRIPPING DOGS, A PAIR OF STOP MEMBERS, LARGER THAN THE HOLES IN THE COLLARS THROUGH WHICH THE THREADED SHAFT PASSES, SECURED TO THE LATTER IN LONGITUDINALY SPACED RELATIONSHIP EXTERNALLY OF THE ENDS OF THE CASING, AND AN EXPANDING NUT THREADEDLY ENGAGED WITH THE SHAFT AND IN LONGITUDINAL SLIDABLE ENGAGEMENT WITH THE GUIDE MEMBERS FOR NON-ROTATIVE LONGITUDINAL MOVEMENT RELATIVE TO THE CASING, WHEREBY UPON ROTATION OF THE SHAFT RELATIVE TO THE CASING THE NUT IS MOVED INTO AND OUT OF SPREADING ENGAGEMENT WITH THE DOGS.
Claim 2
Dependent Claim
177 words
AN EXPANSION BOLT ASSEMBLY COMPRISING AN ELONGATED CASING FORMED AS A PAIR OF SPACED COAXIALLY ALIGNED COLLARS AND A PAIR OF SPACED PARALLEL ELONGATED RIGID GUIDE MEMBERS EXTENDING BETWEEN THE COLLARS, ONE OF SAID COLLARS BEING AN OUTER COLLAR AND THE OTHER AN INNER COLLAR, A PAIR OF ELONGATED GRIPPING DOGS ARRANGED BETWEEN THE GUIDE MEMBERS, EACH OF SAID DOGS BEING CONNECTED AT AN END TO THE OUTER ONE OF THE COLLARS FOR PIVOTAL MOVEMENT AWAY FROM AND TOWARDS THE CASING, A THREADED SHAFT ROTATABLY AND SLIDABLY EXTENDING THROUGH THE CASING BETWEEN THE GRIPPING DOGS, A PAIR OF STOP MEMBERS, LARGER THAN THE HOLES IN THE COLLARS THROUGH WHICH THE THREADED SHAFT PASSES, SECURED TO THE LATTER IN LONGITUDINALY SPACED RELATIONSHIP EXTERNALLY OF THE ENDS OF THE CASING, AND AN EXPANDING NUT THREADEDLY ENGAGED WITH THE SHAFT AND IN LONGITUDINAL SLIDABLE ENGAGEMENT WITH THE GUIDE MEMBERS FOR NON-ROTATIVE LONGITUDINAL MOVEMENT RELATIVE TO THE CASING, WHEREBY UPON ROTATION OF THE SHAFT RELATIVE TO THE CASING THE NUT IS MOVED INTO AND OUT OF SPREADING ENGAGEMENT WITH THE DOGS.
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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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |