US3728064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete plank production
Assignee: Grayron Industries Ltd
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Filing: 1971-02-01
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Granted: 1973-04-17
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Expires: 1991-02-01
Abstract
Abstract Concrete planks are formed by moving one or more pairs of concrete extruders over a plurality of elongated plank-casting beds. The extruders are suspended from a gantry spanning and movable along the beds. The extruders are symmetrically positioned with respect to each other and the gantry whereby twisting and unbalanced load conditions are substantially eliminated. Plank lengths are simultaneously formed on beds and following their formation, the extruders are successively positioned over other beds while maintaining the symmetrical balancing of the extruders on the gantry.
Inventors
- 👤 P Conway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:20
CPC Classifications
B; B28; B28B; B28B15/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
Concrete plank producing apparatus which comprises a gantry having end frames and a pair of spaced frames connecting said end frames and arranged to span a plurality of plank-casting beds, wheels mounted in each of said end frames for movement of said gantry thereon, a rail mounted on each of said connecting frames and extending from one to the other of said end frames, said rails being in spaced parallel relation to each other, a pair of concrete extruders each having wheels engaging said rails for suspension of said extruder therefrom and for movement of said extruder therealong, means on said connecting frames defining a plurality of extruder stations on said rails, said stations being in pairs, one of each pair for a respective one of said extruders, and each pair being symmetrically positioned with respect to the midsection of said rails, and means for moving the gantry and extruders.
Claim 2
Dependent Claim
150 words
Concrete plank producing apparatus which comprises a gantry having end frames and a pair of spaced frames connecting said end frames and arranged to span a plurality of plank-casting beds, wheels mounted in each of said end frames for movement of said gantry thereon, a rail mounted on each of said connecting frames and extending from one to the other of said end frames, said rails being in spaced parallel relation to each other, a pair of concrete extruders each having wheels engaging said rails for suspension of said extruder therefrom and for movement of said extruder therealong, means on said connecting frames defining a plurality of extruder stations on said rails, said stations being in pairs, one of each pair for a respective one of said extruders, and each pair being symmetrically positioned with respect to the midsection of said rails, and means for moving the gantry and extruders.
Claim 3
Dependent Claim
103 words
Concrete plank producing apparatus as defined in claim 1, including a beam mounted on each said end frame in elevated relation thereto, said beams being in parallel uniplanar relation to each other and each extending in a direction substantially normal to that of said rails, a pair of concrete conveyors mounted on said beams, each said conveyor having a supporting frame and an endless belt mounted thereon in overlying relation to said extruder and extending parallel to and substantially coextensive with said rails, and concrete discharging plow means movably mounted on each of said conveyors for positioning directly above one of said extruders.
Claim 4
Dependent Claim
137 words
A concrete plank producing system which comprises a plurality of elongated parallel plank-casting beds, a pair of gantry-supporting rails substantially coextensive with and parallel to said beds, a gantry having end frames, a pair of spaced frames connecting said end frames and spanning said beds, wheels mounted in each of said end frames and engaging said rails for movement of said gantry therealong, means for moving said gantry along said rails, an extruder-suspending rail mounted on each of said connecting frames and extending from one to the other of said end frames, said rails being in spaced parallel relation to each other, means on said connecting frames defining a plurality of extruder stations on said extruder-suspending rails, said stations being in pairs and each pair being symmetrically positioned with respect to the midsection of said extruder-suspending rails.
Claim 5
Dependent Claim
137 words
A concrete plank producing system which comprises a plurality of elongated parallel plank-casting beds, a pair of gantry-supporting rails substantially coextensive with and parallel to said beds, a gantry having end frames, a pair of spaced frames connecting said end frames and spanning said beds, wheels mounted in each of said end frames and engaging said rails for movement of said gantry therealong, means for moving said gantry along said rails, an extruder-suspending rail mounted on each of said connecting frames and extending from one to the other of said end frames, said rails being in spaced parallel relation to each other, means on said connecting frames defining a plurality of extruder stations on said extruder-suspending rails, said stations being in pairs and each pair being symmetrically positioned with respect to the midsection of said extruder-suspending rails.
Claim 6
Dependent Claim
123 words
A concrete plank producing system as defined in claim 3, including a pair of first concrete conveyors mounted on the end frames of said gantry, each said conveyor having an endless belt extending transversely of said beds, a second concrete conveyor having an endless belt extending parallel to and substantially coextensive with said beds, means carried by said gantry for feeding concrete from said second conveyor belt onto said first conveyor belts, and a third concrete conveyor having a frame extending in an upwardly inclined direction towards said second conveyor, and an endless belt on said third conveyor frame and having a lower feed end and an upper discharge end overlying one end of said second conveyor belt for discharge of concrete thereon.
Claim 7
Dependent Claim
68 words
A concrete plank producing system as defined in claim 4, including a pair of concrete extruders each having wheels engaging said extruder-suspending rails for suspension of said extruders therefrom, said extruders being movable along said rails for positioning at said stations, means for moving said extruders along said extruder-suspending rails, and means mounted on each of said first conveyors for discharging concrete therefrom into one of said extruders.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |