Patent US3733163A successfully refreshed from Google Patents.
US3733163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear surface for concrete pipe machine long bottoms
Assignee: CONCRETE PIPE MACH CO
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Filing: 1970-09-01
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Granted: 1973-05-15
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Expires: 1990-09-01
Abstract
Abstract An improved wear surface for long bottoms employed in concrete pipe making machines utilizing the packerhead method of pipe formation wherein the base, or long bottom, of the packerhead includes a plurality of wear segments about the upper circumferential outer surface thereof, each easily removable for replacement after wear. Each segment may be 3.1416 inches wide so that if the diameter of the long bottom is a whole number, measured in inches, an easily determinable number of segments may be used to completely skirt the long bottom for wear purposes. Since the circumference of a circle equals pi times the diameter, and pi equals 3.1416, each 1 inch increase in diameter of the long bottom calls for one additional segment. Each segment is secured to the long bottom by a single bolt, countersunk through the segment wear surface. Preferably, the segments are made of cast Nihard steel, or some other hard, long wearing material.
Inventors
- 👤 L Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:31
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/02; B28B21/10; B28B21/22; B28B21/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 words
In a concrete pipe forming machine utilizing the packerhead method of pipe construction, and including a vertically reciprocable rotary packerhead assembly for forming and troweling the interior surface of the pipe being formed, said packerhead including a pipe forming rotary assembly mounted upon a following, rotary long bottom for smoothing and finishing the interior cylindrical surface of the formed pipe, an improved wear surface for the long bottom comprising: a. a plurality of segments, evenly radially distributed about the outer circumferential cylindrical surface of the long bottom, and arranged to space the long bottom from the interior surface of the pipe being formed; and b. means for securing each segment to the long bottom; the relationship of the diameter of the long bottom, number of segments, and width of each segment being represented by the formula: pi D NW; where D equals the diameter of the long bottom, N, the number of segments, and W, the width of each segment.
Claim 2
Dependent Claim
160 words
In a concrete pipe forming machine utilizing the packerhead method of pipe construction, and including a vertically reciprocable rotary packerhead assembly for forming and troweling the interior surface of the pipe being formed, said packerhead including a pipe forming rotary assembly mounted upon a following, rotary long bottom for smoothing and finishing the interior cylindrical surface of the formed pipe, an improved wear surface for the long bottom comprising: a. a plurality of segments, evenly radially distributed about the outer circumferential cylindrical surface of the long bottom, and arranged to space the long bottom from the interior surface of the pipe being formed; and b. means for securing each segment to the long bottom; the relationship of the diameter of the long bottom, number of segments, and width of each segment being represented by the formula: pi D NW; where D equals the diameter of the long bottom, N, the number of segments, and W, the width of each segment.
Claim 3
Dependent Claim
35 words
The invention as recited in claim 1 wherein said wear segments are distributed one adjacent the other about the long bottom, thereby forming a complete wearing ring about the long bottom outer circumferential cylindrical surface.
Claim 4
Dependent Claim
32 words
The invention as recited in claim 1 wherein the ratio of unit of measurement of the diameter of the long bottom to the width of each wear segment is 1: pi .
Claim 5
Dependent Claim
23 words
The invention as recited in claim 3 wherein the unit of measurement is expressed in inches, each wear segment being 3.1416 inches wide.
Claim 6
Dependent Claim
20 words
The invention as recited in claim 1 wherein said segments are distributed about the upper edge of the long bottom.
Claim 7
Dependent Claim
28 words
The invention as recited in claim 5 wherein each wear segment includes a lip formed along the upper portion thereof to rest on the long bottom upper edge.
Claim 8
Dependent Claim
66 words
The invention as recited in claim 1 wherein said each of said means for securing each segment to the long bottom comprises: a. means defining a bore through the long bottom; b. means defining a mating countersink through the wear surface of the wear segment; and c. nut and bolt means extending through the bore and countersink to secure the wear segment to the long bottom.
Claim 9
Dependent Claim
33 words
The invention as recited in claim 1 wherein the ratio of unit of measurement of the diameter of the long bottom to the width of each wear segment is 1: 1/2 pi .
Claim 10
Dependent Claim
23 words
The invention as recited in claim 8 wherein the unit of measurement is expressed in inches, each wear segment being 1.5708 inches wide.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |