US3922133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe forming packerhead apparatus with spigot end pressing means
Assignee: International Pipe Machinery Corp
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Filing: 1973-03-28
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Granted: 1975-11-25
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Expires: 1993-03-28
Abstract
Abstract A packerhead/vibration system concrete pipe machine having an overfill and compaction ring assembly mounted on top of the pipe mold enabling complete formation of the concrete pipe in one stage without need of adding extra concrete to the top of the mold to make up for volume lost in inherent compaction of material caused by vibration. A method of vibratory concrete pipe manufacture including the steps of overfilling the pipe mold in the pipe forming process, vibrating the concrete forming the pipe, and compressing the overfill concrete into a space created by densification of the pipe material caused by vibration.
Inventors
- 👤 Gerald R Crawford
- 👤 Joseph F Wenther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:28
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/02; B28B21/10; B28B21/22; B28B21/24; B28B21/28
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
153 words
A packerhead/vibration system for making pipe of cementitious material in one continuous operation comprising: pipe form means; means for introducing cementitious material into said pipe form means; a rotating packerhead, upwardly moveable through said pipe form means for making the pipe; means for vibrating the cementitious material comprising the pipe as the pipe is made; means for enabling overfilling said pipe form means with an overfill of the cementitious material and being located on said pipe form means as the pipe is made; means for compressing said overfill into said pipe form means to complete the end of a green pipe; and means on said pipe form means for positioning said overfill compressing means in a first predetermined location as the pipe is made and in a second predetermined location beneath said first predetermined location after said overfill is compressed into said pipe form means to complete the end of a green pipe.
Claim 2
Dependent Claim
153 words
A packerhead/vibration system for making pipe of cementitious material in one continuous operation comprising: pipe form means; means for introducing cementitious material into said pipe form means; a rotating packerhead, upwardly moveable through said pipe form means for making the pipe; means for vibrating the cementitious material comprising the pipe as the pipe is made; means for enabling overfilling said pipe form means with an overfill of the cementitious material and being located on said pipe form means as the pipe is made; means for compressing said overfill into said pipe form means to complete the end of a green pipe; and means on said pipe form means for positioning said overfill compressing means in a first predetermined location as the pipe is made and in a second predetermined location beneath said first predetermined location after said overfill is compressed into said pipe form means to complete the end of a green pipe.
Claim 3
Dependent Claim
64 words
The packerhead/vibration system as recited in claim 1 wherein said pipe form means comprise a generally cylindrical and vertically disposed jacket having pipe bell end forming means at the lower end thereof and pipe spigot end forming means at the upper end thereof, said overfill compressing means and said means for positioning said overfill compressing means both surmounting said pipe spigot end forming means.
Claim 4
Dependent Claim
47 words
The packerhead/vibration system as recited in claim 2 wherein said pipe form means further comprise a hopper surmounting said spigot end forming means, said means for compressing said overfill into said pipe and said means for positioning said overfill compressing means both being mounted on said hopper.
Claim 5
Dependent Claim
50 words
The packerhead/vibration system as recited in claim 3 wherein said hopper further comprises a stationary top centering ring located concentrically downwardly of said hopper, positionable on the upper outer periphery of said pipe form during a pipe making operation, and removable therefrom with said hopper after a pipe making operation.
Claim 6
Dependent Claim
38 words
The packerhead/vibration system as recited in claim 4 wherein said overfill means and said overfill compressing means are arranged concentrically, one with respect to the other, and generally between said pipe form upper outer periphery and said hopper.
Claim 7
Dependent Claim
75 words
The packerhead/vibration system as recited in claim 5 wherein said overfill compressing means comprise an overfill compression ring, rigidly mounted on and depending concentrically downwardly interiorally from said hopper, releasable spacer means separating said hopper and said top centering ring, and hopper holddown means, operative to move said hopper and overfill compression ring downwardly with respect to said top centering ring and said pipe form to compress said overfill into said pipe form spigot end.
Claim 8
Dependent Claim
21 words
The packerhead/vibration system as recited in claim 6 wherein said spacer means comprise a plurality of circumferentially spaced fluid pressure actuators.
Claim 9
Dependent Claim
20 words
The packerhead/vibration system as recited in claim 7 wherein each of said fluid pressure actuators comprises a piston cylinder actuator.
Claim 10
Dependent Claim
37 words
The packerhead/vibration system as recited in claim 8 wherein said each of said plurality of piston cylinder actuators further comprises adjustable stop means for adjustably preselecting the separation distance between said hopper and said top centering ring.
Claim 11
Dependent Claim
88 words
The packerhead/vibration system as recited in claim 9 wherein said adjustable stop means comprises at least a pair of posts depending from said hopper on opposite sides of said actuator and projecting through said top centering ring, each post having stop means at the lower end of said post, beneath said top centering ring and arranged to abut the lower surface of said top centering ring, and releasable securing means on said post beneath said stop means for adjusting the location of said stop means along said post.
Claim 12
Dependent Claim
110 words
The packerhead/vibration system as recited in claim 6 wherein said pipe form means further comprise an open bore cap ring at the spigot end thereof, arranged to form approximately one-half of the outer spigot end of the pipe, means for securing said open bore cap ring at the top of said pipe form means, beneath said top centering ring, said overfill means comprising a vertically arranged relatively short length cylindrical spacer ring mounted on the inner peripheral edge of said top centering ring, said overfill compression ring being arranged concentrically interiorally of said overfill means spacer ring and movable downwardly therewithin to compact said overfill into said pipe form means.
Claim 13
Dependent Claim
43 words
The packerhead/vibration system as recited in claim 11 wherein said means for securing said open bore cap ring in said pipe means comprise a plurality of circumferentially spaced retractable support pins, located through said pipe form, substantially beneath said open bore cap ring.
Claim 14
Dependent Claim
38 words
The packerhead/vibration system as recited in claim 11 wherein said overfill means spacer ring further comprise means defining a plurality of passage means adjacent the upper periphery thereof, for discharge of cementitious material exceeding desired amount of overfill.
Claim 15
Dependent Claim
41 words
The packerhead/vibration system as recited in claim 11 wherein said overfill means spacer ring is arranged between said hopper and said top centering ring to limit the approach of said hopper and top centering ring together during a pipe making operation.
Claim 16
Dependent Claim
102 words
The packerhead/vibration system as recited in claim 6 wherein said means for overfilling the pipe form means comprise a closed bore cap ring at the spigot end of said pipe form means, arranged to form substantially the entire outer peripheral end of the pipe spigot end, and releasable support means to support said closed bore cap ring above the upper end of said pipe form, said overfill compression ring being located above said closed bore cap ring and arranged to press said closed bore cap ring and said overfill therebeneath into said form means to complete the spigot end of the pipe.
Claim 17
Dependent Claim
32 words
The packerhead/vibration syStem as recited in claim 15 wherein said top centering ring includes a short length cylindrical spacer ring for limiting axial approach of said hopper and said top centering ring.
Claim 18
Dependent Claim
36 words
The packerhead/vibration system as recited in claim 16 wherein said short length cylindrical spacer ring further comprises means defining a plurality of passage means along the upper periphery thereof, for discharge of excess cementitious material therethrough.
Claim 19
Dependent Claim
76 words
The packerhead/vibration system as recited in claim 5 wherein said hopper and said top centering ring are rigidly secured together, said overfill compressing means comprising an overfill compressing ring, located concentrically downwardly interiorally of said hopper, actuating ring means, located interiorally of said hopper, said overfill compression ring depending therefrom, and fluid pressure actuating means mounted in said hopper for moving said actuating ring means and overfill compression ring vertically downwardly towards said pipe form means.
Claim 20
Dependent Claim
40 words
The packerhead/vibration system as recited in claim 18 wherein said fluid pressure actuating means for moving said actuating ring means and overfill compression ring comprise at least a pair of piston cylinder actuators, located on opposite sides of said hopper.
Claim 21
Dependent Claim
83 words
The packerhead/vibration system as recited in claim 19 wherein each of said pair of piston cylinder actuators is arranged at an angle to a horizontal plane and further comprises cam means mounted on one of said actuating ring means or hopper and cooperating cam follower means mounted on the other of said actuating ring means or hopper whereby upon actuation of said piston cylinder actuators, said actuating ring means and overfill compression ring means are driven spirally downwardly towards said pipe form means.
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |