US4540539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for production of concrete pipe by the packerhead method
Assignee: International Pipe Machinery Corp
•
Filing: 1982-12-21
•
Granted: 1985-09-10
•
Expires: 2002-12-21
Abstract
Abstract A packerhead, a concrete pipe making machine having said packerhead, and a method of making concrete pipe are disclosed in which twist forces on the reinforcing wire cage of the pipe and concrete voids are eliminated by rotation of the longbottom and rollerhead portions of the packerhead in opposite directions. The peripheral speed of the system is also increased over conventional systems.
Inventors
- 👤 Gerald R. Crawford
- 👤 Brian J. Kozlowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:39
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/56; B28B21/02; B28B21/10; B28B21/22; B28B21/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
In a wire reinforced concrete pipe making machine, means for inserting a reinforcing wire cage in said concrete pipe mold, a bi-directional packerhead assembly, said bi-directional packerhead assembly consisting of a longbottom, means for causing rotation of said longbottom in a first direction as said bi-directional packerhead traverses a reinforcing wire cage located within a concrete pipe mold, a rollerhead, said rollerhead consisting of a roller carrying assembly and a plurality of rollers mounted on said roller carying assembly, and means for causing rotation of said rollerhead in a direction opposite to the direction of rotation of the longbottom at a peripheral speed such as to counteract the twist imposed on the reinforcing wire cage as said bi-directional packerhead traverses the reinforcing wire cage located within said concrete pipe mold.
Claim 2
Dependent Claim
130 words
In a wire reinforced concrete pipe making machine, means for inserting a reinforcing wire cage in said concrete pipe mold, a bi-directional packerhead assembly, said bi-directional packerhead assembly consisting of a longbottom, means for causing rotation of said longbottom in a first direction as said bi-directional packerhead traverses a reinforcing wire cage located within a concrete pipe mold, a rollerhead, said rollerhead consisting of a roller carrying assembly and a plurality of rollers mounted on said roller carying assembly, and means for causing rotation of said rollerhead in a direction opposite to the direction of rotation of the longbottom at a peripheral speed such as to counteract the twist imposed on the reinforcing wire cage as said bi-directional packerhead traverses the reinforcing wire cage located within said concrete pipe mold.
Claim 3
Dependent Claim
101 words
In a wire reinforced concrete pipe making machine, a bi-directional packerhead assembly, said bi-directional packerhead assembly consisting of a longbottom, means for causing rotation of said longbottom in a first direction as said bi-directional packerhead traverses a reinforcing wire cage located within a concrete pipe mold, a rollerhead, said roller head consisting of a roller carrying assembly and a plurality of rollers mounted on said roller carying assembly, and means for causing rotation of said rollerhead in a directional opposite to the direction of rotation of the longbottom at a peripheral speed substantially equal to the peripheral speed of said longbottom.
Claim 4
Dependent Claim
101 words
In a wire reinforced concrete pipe making machine, a bi-directional packerhead assembly, said bi-directional packerhead assembly consisting of a longbottom, means for causing rotation of said longbottom in a first direction as said bi-directional packerhead traverses a reinforcing wire cage located within a concrete pipe mold, a rollerhead, said roller head consisting of a roller carrying assembly and a plurality of rollers mounted on said roller carying assembly, and means for causing rotation of said rollerhead in a directional opposite to the direction of rotation of the longbottom at a peripheral speed substantially equal to the peripheral speed of said longbottom.
Claim 5
Dependent Claim
23 words
The wire reinforced concrete pipe making machine of claim 2 further including means for inserting a reinforcing wire cage in said concrete mold.
Claim 6
Dependent Claim
36 words
The packerhead assembly of claim 1 or claim 2 further characterized by and including means for rotating the rollers on the roller carrying assembly in a direction opposite to the direction of rotation of the rollerhead.
Claim 7
Dependent Claim
142 words
A high speed method of making reinforced concrete pipe comprising the steps of traversing a packerhead vertically through a reinforcing wire cage located within a concrete pipe mold, applying a first troweling force to concrete fed to the upper side of the packerhead and centrifically placed about the cage in the mold, said troweling force being applied in a first direction of rotation, to lay up the concrete, applying a second troweling force to the laid up concrete at a location below the application of the first troweling force, said second troweling force being applied in a direction of rotation opposite to that of the first direction of rotation at a peripheral speed such as to counteract the twist imposed on the reinforcing wire cage, said first and second troweling forces being applied to the concrete by means carried by the packerhead.
Claim 8
Dependent Claim
142 words
A high speed method of making reinforced concrete pipe comprising the steps of traversing a packerhead vertically through a reinforcing wire cage located within a concrete pipe mold, applying a first troweling force to concrete fed to the upper side of the packerhead and centrifically placed about the cage in the mold, said troweling force being applied in a first direction of rotation, to lay up the concrete, applying a second troweling force to the laid up concrete at a location below the application of the first troweling force, said second troweling force being applied in a direction of rotation opposite to that of the first direction of rotation at a peripheral speed such as to counteract the twist imposed on the reinforcing wire cage, said first and second troweling forces being applied to the concrete by means carried by the packerhead.
Claim 9
Dependent Claim
45 words
The method of making reinforced concrete pipe of claim 5 further characterized in that the first troweling force is applied from a rollerhead assembly consisting of a single rollerhead, and the second troweling force is applied from a longbottom assembly consisting of a single longbottom.
Claim 10
Dependent Claim
30 words
The method of claim 5 further characterized in that the peripheral speed of the means which apply at least one of the troweling forces is about 14,000 inches per minute.
Claim 11
Dependent Claim
38 words
The method of making reinforced concrete pipe of of claim 7 further characterized in that the first troweling force is applied by a plurality of rollers whose vertical axis of rotation move in said first direction of rotation.
References Cited (Backward Citations)
US1895740A
Cited
US1938230A
Cited
CH383861A
Cited
US3096556A
Cited
US3276091A
Cited
US3746494A
Cited
US3632270A
Cited
US3733163A
Cited
DE2738944A1
Cited
US4340553A
Cited
US4407648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |