US3883109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold for making meter box covers and the like
Assignee: PRE CAST CONCRETE PRODUCTS LIM
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Filing: 1970-06-23
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Granted: 1975-05-13
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Expires: 1990-06-23
Abstract
Abstract A unitary mold for use in casting concrete objects, for example, meter box covers and the like. The mold comprises a one-piece tray molded from flexible polyvinylchloride having a bottom wall and a peripheral sidewall having an external annular flange on the upper end thereof, and a steel ring that is placed on the exterior of the tray prior to casting an object to ensure dimensional stability. The top surface of the bottom of the tray is formed with whatever nonskid or other pattern is desired for the top surface of the cast object, and can include a cavity to receive various pattern inserts for forming lettering, indentations or other formations on the cast object. The inner surfaces of the side walls are tapered inwardly from the lower end to the top thereof, to form side walls on the cast object that taper inwardly from the top to the bottom of said object. To remove the object from the mold, the ring is first removed, and the polyvinylchloride tray is then flexed or stretched as required to free the object.
Inventors
- 👤 Walter B Hahne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:17
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0064; B28B7/0076; B28B7/06; Y; Y10; Y10S; Y10S425/00; Y10S425/019; Y10S425/044; Y10S425/058
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
228 words
A mold for casting objects from a concrete mix or the like, comprising: a unitary tray made of flexible, stretchable polyvinylchloride, said tray having a bottom wall and side walls extending upwardly from said bottom wall, said side walls having vertical exterior surfaces, an annular flange projecting outwardly from the upper edge of said side walls, said annular flange having a lower face and having an annular groove formed in said lower face adjacent the exterior of said side walls, said groove being defined in part by said side walls, said tray having its interior shaped to conform to the shape of the object to be cast therein, a rigid band detachably mounted upon said tray and having an upper edge received within said annular groove, said band being of a height sufficient to engage and support said vertical side walls throughout their height, said annular flange cooperating with said band as reinforcement for holding the exterior configuration of the tray from being distorted during casting, said bottom wall having a recess formed in its upper surface, said recess having an inwardly directed flange on the side wall thereof extending completely about said recess, and an insert received in said recess, said insert including a portion engageable beneath said inwardly directed flange for retaining said insert in said recess, said insert being removable by flexing said bottom wall.
Claim 2
Dependent Claim
228 words
A mold for casting objects from a concrete mix or the like, comprising: a unitary tray made of flexible, stretchable polyvinylchloride, said tray having a bottom wall and side walls extending upwardly from said bottom wall, said side walls having vertical exterior surfaces, an annular flange projecting outwardly from the upper edge of said side walls, said annular flange having a lower face and having an annular groove formed in said lower face adjacent the exterior of said side walls, said groove being defined in part by said side walls, said tray having its interior shaped to conform to the shape of the object to be cast therein, a rigid band detachably mounted upon said tray and having an upper edge received within said annular groove, said band being of a height sufficient to engage and support said vertical side walls throughout their height, said annular flange cooperating with said band as reinforcement for holding the exterior configuration of the tray from being distorted during casting, said bottom wall having a recess formed in its upper surface, said recess having an inwardly directed flange on the side wall thereof extending completely about said recess, and an insert received in said recess, said insert including a portion engageable beneath said inwardly directed flange for retaining said insert in said recess, said insert being removable by flexing said bottom wall.
Claim 3
Dependent Claim
15 words
A mold as recited in claim 1, wherein the removable insert is made of polyvinylchloride.
Claim 4
Dependent Claim
29 words
A mold as recited in claim 1, wherein the bottom surface of the removable insert is engaged with the bottom wall of the recess oVer the entire area thereof.
Claim 5
Dependent Claim
38 words
A mold as recited in claim 1, wherein the insert has an outwardly directed flange extending completely about the insert at its lower edge, said outwardly directed flange being engaged with the inwardly directed flange of the recess.
Claim 6
Dependent Claim
72 words
A mold as recited in claim 4, wherein the insert is flexible and carries a raised projection thereon, said projection having a bore therethrough for holding a pin so that the opposite ends of said pin can be cast into an object, said projection being split from said bore to the outer periphery of said projection so that after said object is completed said flexible insert can be removed from said pin.
Claim 7
Dependent Claim
94 words
A mold for casting objects from a concrete mix or the like, comprising: a flexible plastic tray for receiving said mix, said tray having a bottom wall and side walls extending upwardly therefrom, the upper surface of said bottom wall containing a recess having an inwardly directed marginal flange extending throughout its periphery; and an insert disposed in said recess and having a peripheral flange engaged with said inwardly directed marginal flange to demountably retain said insert in said recess, said insert being readily removable upon flexing of the bottom wall of said tray.
Claim 8
Dependent Claim
94 words
A mold for casting objects from a concrete mix or the like, comprising: a flexible plastic tray for receiving said mix, said tray having a bottom wall and side walls extending upwardly therefrom, the upper surface of said bottom wall containing a recess having an inwardly directed marginal flange extending throughout its periphery; and an insert disposed in said recess and having a peripheral flange engaged with said inwardly directed marginal flange to demountably retain said insert in said recess, said insert being readily removable upon flexing of the bottom wall of said tray.
Claim 9
Dependent Claim
16 words
A mold as recited in claim 6, wherein the insert is made of flexible plastic material.
Claim 10
Dependent Claim
16 words
A mold as recited in claim 6, wherein the mold and insert are made of polyvinylchloride.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |