Patent US1430971A successfully refreshed from Google Patents.
US3592243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating pc concrete pipe reinforcing
Assignee: Nippon Concrete Industries Co Ltd
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Filing: 1969-01-29
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Granted: 1971-07-13
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Expires: 1989-01-29
Abstract
Abstract A method of fabricating reinforcements for PC concrete pipe comprising forming a central cage structure and two end cages of slightly larger diameter than said central cage, positioning the said end cages at each end of said central cage structure, inserting tension reinforcing material along the length of said cage structure, without intertwining said tensioning reinforcing members, and through holes formed on the end surfaces of metal fittings, forming hook ends on the tension reinforcing members, and extending said metal fittings to contact said hook ends and place the tension reinforcing members under tension, the central cage structure being free to move within the end cages, and the end cages being attached to the end surface metal fittings.
Inventors
- 👤 Yoshikiyo Fukushima
- 👤 Yasushi Ishihara
- 👤 Kenzo Momota
- 👤 Yasuo Usui
- 👤 Tuyoshi Sakumura
- 👤 Satoru Sogo
- 👤 Koji Nunokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:00
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/01; E04C5/06; E04C5/0604; E04C5/0618; B; B21; B21F; B21F27/00; B21F27/12; B21F27/121; B21F27/122; B21F27/124
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
164 words
A method of fabricating reinforcement for PC concrete pipes comprising: 1. forming a first cage-shaped body of vertical and transverse nontension reinforcements; 2. forming a pair of second cage-shaped bodies of vertical and transverse nontension reinforcements, said second cage bodies having a larger diameter than said first cage-shaped body; 3. positioning but not attaching said second cage-shaped bodies at either end of said first cage-shaped body to form a cageshaped body assembly; 4. attaching an end surface metal fitting to each second cageshaped body at each end of the cage-shaped body assembly; 5. passing tension reinforcements vertically along the cageshaped structures and through holes formed in each of said metal fittings, said tension reinforcements being longer than the distance between said metal fittings; 6. forming hooking ends on each end of said tension reinforcements to prevent said reinforcements from passing back through the holes in said fittings, and 7. pulling said metal fittings in opposite directions until said tension reinforcements are placed in tension.
Claim 2
Independent Claim
164 words
A method of fabricating reinforcement for PC concrete pipes comprising: 1. forming a first cage-shaped body of vertical and transverse nontension reinforcements; 2. forming a pair of second cage-shaped bodies of vertical and transverse nontension reinforcements, said second cage bodies having a larger diameter than said first cage-shaped body; 3. positioning but not attaching said second cage-shaped bodies at either end of said first cage-shaped body to form a cageshaped body assembly; 4. attaching an end surface metal fitting to each second cageshaped body at each end of the cage-shaped body assembly; 5. passing tension reinforcements vertically along the cageshaped structures and through holes formed in each of said metal fittings, said tension reinforcements being longer than the distance between said metal fittings; 6. forming hooking ends on each end of said tension reinforcements to prevent said reinforcements from passing back through the holes in said fittings, and 7. pulling said metal fittings in opposite directions until said tension reinforcements are placed in tension.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the transverse reinforcements of the central cage comprise a coil-shaped spiral reinforcement.
Claim 4
Dependent Claim
26 words
forming a pair of second cage-shaped bodies of vertical and transverse nontension reinforcements, said second cage bodies having a larger diameter than said first cage-shaped body;
Claim 5
Dependent Claim
26 words
forming a pair of second cage-shaped bodies of vertical and transverse nontension reinforcements, said second cage bodies having a larger diameter than said first cage-shaped body;
Claim 6
Dependent Claim
22 words
positioning but not attaching said second cage-shaped bodies at either end of said first cage-shaped body to form a cage-shaped body assembly;
Claim 7
Dependent Claim
22 words
positioning but not attaching said second cage-shaped bodies at either end of said first cage-shaped body to form a cage-shaped body assembly;
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein the transverse reinforcements of the central cage comprise ring-shaped horizontal reinforcements mounted together by the vertical reinforcements.
Claim 9
Dependent Claim
19 words
attaching an end surface metal fitting to each second cage-shaped body at each end of the cage-shaped body assembly;
Claim 10
Dependent Claim
19 words
attaching an end surface metal fitting to each second cage-shaped body at each end of the cage-shaped body assembly;
Claim 11
Dependent Claim
30 words
passing tension reinforcements vertically along the cage-shaped structures and through holes formed in each of said metal fittings, said tension reinforcements being longer than the distance between said metal fittings;
Claim 12
Dependent Claim
30 words
passing tension reinforcements vertically along the cage-shaped structures and through holes formed in each of said metal fittings, said tension reinforcements being longer than the distance between said metal fittings;
Claim 13
Dependent Claim
24 words
forming hooking ends on each end of said tension reinforcements to prevent said reinforcements from passing back through the holes in said fittings, and
Claim 14
Dependent Claim
24 words
forming hooking ends on each end of said tension reinforcements to prevent said reinforcements from passing back through the holes in said fittings, and
Claim 15
Dependent Claim
15 words
pulling said metal fittings in opposite directions until said tension reinforcements are placed in tension.
Claim 16
Dependent Claim
15 words
pulling said metal fittings in opposite directions until said tension reinforcements are placed in tension.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |