US3661186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for making concrete pipe reinforcement member
Assignee: W E DUNN Manufacturing CO
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Filing: 1969-12-29
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Granted: 1972-05-09
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Expires: 1989-12-29
Abstract
Abstract Apparatus for and a process of welding and forming metal grid work into a reinforcing cage, having a driven mandrel and two idling mandrels, the latter of which are axially adjustable relative to each other and to the driven mandrel by means of a hydraulically actuated sleeve telescoping over the idling shaft and a hydraulically actuated carriage, respectively. One of the two idling mandrels bells the cage end, and this mandrel is recessed circumferentially to cooperate with a hand bending tool to complete the belling.
Inventors
- 👤 Alfred A Nordgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:14
CPC Classifications
B; B21; B21F; B21F27/00; B21F27/12; B21F27/121; B21F27/127; B21F27/125
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
Apparatus for making a belled wire cage utilized in forming reinforced concrete pipes, the cage being constructed from a grid work having ends extending from one side, said apparatus comprising: a base; a first mandrel having a cage supporting section mounted at one end of said base; a second mandrel having a cage supporting section mounted on said base at a position spaced from said first mandrel, the position of said second mandrel being adjustable relative to said first mandrel; means on said base for adjusting the relative spatial relationship of said mandrels; means shiftable relative to said first and second mandrels for expanding the ends of the grid away from said axes; and means for actuating said expanding means.
Claim 2
Dependent Claim
120 words
Apparatus for making a belled wire cage utilized in forming reinforced concrete pipes, the cage being constructed from a grid work having ends extending from one side, said apparatus comprising: a base; a first mandrel having a cage supporting section mounted at one end of said base; a second mandrel having a cage supporting section mounted on said base at a position spaced from said first mandrel, the position of said second mandrel being adjustable relative to said first mandrel; means on said base for adjusting the relative spatial relationship of said mandrels; means shiftable relative to said first and second mandrels for expanding the ends of the grid away from said axes; and means for actuating said expanding means.
Claim 3
Dependent Claim
34 words
The apparatus as set forth in claim 1 wherein said first and second mandrels are rotatably mounted in coaxial fashion upon said base and which further comprises means for rotating one of said mandrels.
Claim 4
Dependent Claim
37 words
The apparatus as set forth in claim 2 wherein the position of said second mandrel is adjustable relative to said first mandrel along a line coinciding with the axes of rotation of said first and second mandrels.
Claim 5
Dependent Claim
59 words
The apparatus as defined in claim 3 wherein: said adjusting means includes a rail fixed to said base and a carriage movably mounted on said rail; and said expanding means includes a third mandrel rotatably mounted on said carriage coaxially with said first and second mandrels, said third mandrel being axially shiftable relative to said first and second mandrels.
Claim 6
Dependent Claim
36 words
The apparatus as set forth in claim 4 which further comprises a shaft means mounted upon said carriage, said second and third mandrels being mounted upon said shaft means for rotation and for relative sliding movement.
Claim 7
Dependent Claim
25 words
The apparatus as set forth in claim 5 wherein said third mandrel includes a tapered portion for engaging and expanding the ends of said grid.
Claim 8
Dependent Claim
18 words
The apparatus as set forth in claim 6 wherein said third mandrel is recessed radially about its perimeter.
Claim 9
Dependent Claim
16 words
The apparatus as set forth in claim 6 wherein said actuating means comprises a hydraulic cylinder.
Claim 10
Dependent Claim
54 words
In combination with the apparatus as defined in claim 7, a bending tool comprising an elongated member having at one end a U-shaped opening and at the other end a handle, the member having a thickness at the U-shaped end thereof which is less than the width of the recess in said third mandrel.
Claim 11
Dependent Claim
18 words
The combination as defined in claim 9 wherein said handle has welded transversely to it a second handle.
Claim 12
Dependent Claim
76 words
The process of making a belled wire cage utilized in forming reinforced concrete pipes, comprising the steps of: positioning on two mandrels a rolled-up grid work having free ends extending from one end; seam-welding the grid work to fOrm a cage; inserting a third mandrel into said end of the grid work to expand the free ends away from the mandrel; bending a portion of one of the free ends so expanded back toward the mandrel.
Claim 13
Dependent Claim
76 words
The process of making a belled wire cage utilized in forming reinforced concrete pipes, comprising the steps of: positioning on two mandrels a rolled-up grid work having free ends extending from one end; seam-welding the grid work to fOrm a cage; inserting a third mandrel into said end of the grid work to expand the free ends away from the mandrel; bending a portion of one of the free ends so expanded back toward the mandrel.
Claim 14
Dependent Claim
56 words
The process as set forth in claim 11 which further comprises the steps of: indexing the cage to bring the next free end into position for bending; bending a portion of the next expanded free end back toward the mandrel; and continuing the alternating steps of indexing and bending until the belled female end is formed.
Claim 15
Dependent Claim
22 words
The process as defined in claim 12 and further including the step of wrapping the formed belled female end to reinforce it.
References Cited (Backward Citations)
US2091540A
Cited
US3437114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |