US3892826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a cored concrete slab
Assignee: DUES JOSEPH J
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Filing: 1971-09-14
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Granted: 1975-07-01
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Expires: 1991-09-14
Abstract
Abstract A method for forming cored concrete slab utilizing an elongated fixed mold for forming the opposite sides and bottom surface of the slab. A concrete depositing and core forming assembly moves longitudinally over the mold, the assembly including a plurality of elongated core forming mandrels and a hopper which deposits a first layer of concrete in the mold generally to the top of the mandrels. A length of metal mesh is provided having its free end attached at one end of the mold, the mesh being coiled on a reel mounted on the assembly which lays the mesh over the mandrels and the first layer, applying tension thereto, as the assembly moves toward the other end of the mold. Another hopper is mounted on the assembly which deposits a second layer of concrete over the first layer and mesh. The concrete has a slump of from 1 to 2 inches and the mesh is chosen so as to act as a concrete supporting material so as to allow removal of the mandrels at a rate faster than the concrete becomes self supporting whereby the mesh prevents collapsing of the cores. The mandrels may be rotated as they are withdrawn from the concrete and the method may also be utilized to form prestressed cored slabs.
Inventors
- 👤 Robert L Yost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:38
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/16; B28B7/18; B28B7/186; B28B1/00; B28B1/08; B28B1/084; B28B1/085; B28B13/00; B28B13/02; B28B23/00; B28B23/0006; B28B7/28; B28B7/30; Y; Y10; Y10S; Y10S264/00; Y10S264/57
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
217 words
THE METHOD OF MAKING A CORED CEMENTITOUS SLAB COMPRISING THE STEPS OF PROVIDING AN ELONGATED MOLD HAVING A BOTTOM AND UPSTANDING SIDES FOR FORMING THE BOTTOM AND SIDE SURFACES OF A SLAB, PLACING A PLURALITY OF ELONGATED MANDRELS IN SAID MOLD ADJACENT TO ONE END THEREOF AND IN A SPACED AND PARALLEL RELATIONSHIP WITH RESPECT TO EACH OTHER AND SAID MOLD SIDES SO AS TO EXTEND LONGITUDINALLY OF SAID MOLD, AND SEQUENTIALLY PERFORMING THE FOLLOWING STEPS, DEPOSITING A FIRST LAYER .OF CEMENTITIOUS MATERIAL IN RELATIVELY FLUID FROM HAVING A SLUMP FROM ABOUT 1 INCH TO ABOUT 2 INCHES IN SAID MOLD TO A LEVEL GENERALLY EVEN WITH THE TOPS OF SAID MANDRELS, LAYING ELONGATED CEMENTITIOUS MATERIAL SUPPORTING MATERIAL IN SAID MOLD OVER SAID MANDRELS AND SAID FIRST LAYER, DEPOSITING A SECOND LAYER OF CEMENTITIOUS MATERIAL IN RELATIVELY FLUID FROM HAVING A SLUMP FROM ABOUT 1 INCH TO ABOUT 2 INCHES IN SAID MOLD OVER SAID FIRST LAYER AND SAID CEMENTITIOUS MATERIAL SUPPORTING MATERIAL WHILE CONTINUOUSLY IMPARTING TROWELING MOTION TO EACH OF SAID MANDRELS, MOVING SAID MANDRELS FROM ADJACENT TO SAID ONE END OF SAID MOLD TOWARD THE OTHER END OF SAID MOLD TO REMOVE THE MANDRELS FROM THE SLAB AT A RATE IN EXCESS OF ABOUT 1 FOOT PER MINUTE AND FASTER THAN SAID CEMENTITIOUS MATERIAL BECOMES
Claim 2
Independent Claim
217 words
THE METHOD OF MAKING A CORED CEMENTITOUS SLAB COMPRISING THE STEPS OF PROVIDING AN ELONGATED MOLD HAVING A BOTTOM AND UPSTANDING SIDES FOR FORMING THE BOTTOM AND SIDE SURFACES OF A SLAB, PLACING A PLURALITY OF ELONGATED MANDRELS IN SAID MOLD ADJACENT TO ONE END THEREOF AND IN A SPACED AND PARALLEL RELATIONSHIP WITH RESPECT TO EACH OTHER AND SAID MOLD SIDES SO AS TO EXTEND LONGITUDINALLY OF SAID MOLD, AND SEQUENTIALLY PERFORMING THE FOLLOWING STEPS, DEPOSITING A FIRST LAYER .OF CEMENTITIOUS MATERIAL IN RELATIVELY FLUID FROM HAVING A SLUMP FROM ABOUT 1 INCH TO ABOUT 2 INCHES IN SAID MOLD TO A LEVEL GENERALLY EVEN WITH THE TOPS OF SAID MANDRELS, LAYING ELONGATED CEMENTITIOUS MATERIAL SUPPORTING MATERIAL IN SAID MOLD OVER SAID MANDRELS AND SAID FIRST LAYER, DEPOSITING A SECOND LAYER OF CEMENTITIOUS MATERIAL IN RELATIVELY FLUID FROM HAVING A SLUMP FROM ABOUT 1 INCH TO ABOUT 2 INCHES IN SAID MOLD OVER SAID FIRST LAYER AND SAID CEMENTITIOUS MATERIAL SUPPORTING MATERIAL WHILE CONTINUOUSLY IMPARTING TROWELING MOTION TO EACH OF SAID MANDRELS, MOVING SAID MANDRELS FROM ADJACENT TO SAID ONE END OF SAID MOLD TOWARD THE OTHER END OF SAID MOLD TO REMOVE THE MANDRELS FROM THE SLAB AT A RATE IN EXCESS OF ABOUT 1 FOOT PER MINUTE AND FASTER THAN SAID CEMENTITIOUS MATERIAL BECOMES
Claim 3
Dependent Claim
22 words
The method of claim 1 comprising the further step of applying tension to said cementitious material supporting material during said laying thereof.
Claim 4
Dependent Claim
99 words
The method of claim 1 wherein said cementitious material is a mixture of aggregate, sand, cement and water, and a water dispersing agent, said cementitious material having a low slump, said slump is from about 1 inch to about 2 inches, said aggregate comprises from about 1000 lbs. to about 1300 lbs. of No. 9 stone, said sand comprises from about 1700 lbs. to about 2000 lbs. of No. 14 sand, said cement and water comprises from about 650 lbs. to about 760 lbs. of high early cement and from about 30 gallons to about 40 gallons of water.
Claim 5
Dependent Claim
51 words
The method of claim 1 wherein said laying step and said depositing steps are performed at positions which are fixed with respect to said mandrels and move with said mandrels toward said other end as said slab is formed, each of said positions being between the opposite ends of said mandrels.
Claim 6
Dependent Claim
71 words
The method of claim 4 wherein said first layer depositing step is performed adjacent to said leading ends of said mandrels, said position at which said second layer depositing step is performed being spaced and remote from said position of said first layer depositing step, said laying step being performed at a position spaced from and between said depositing steps, both said depositing steps and said laying step being performed simultaneously.
Claim 7
Dependent Claim
38 words
The method of claim 1 wherein each of said mandrels has a longitudinal axis between its ends, and said imparting step includes the step of imparting a limited rotary oscillatory motion to said mandrels about their respective axes.
Claim 8
Dependent Claim
19 words
The method of claim 1 further comprising the step of packing said first layer between each of said mandrels.
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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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |