Patent US3830458A successfully refreshed from Google Patents.
US3830458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold for casting concrete articles
Assignee: Dow Mac Concrete Ltd
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Filing: 1973-10-12
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Granted: 1974-08-20
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Expires: 1993-10-12
Abstract
Abstract A mould suitable for casting concrete articles includes a pair of sheet metal side wall members each of which has a number of vertical struts spaced apart along its length with a top strap attached to the top end of each strut. Each strap extends partway across the mould and is pivotally joined at its end remote from the strut to the end of a strap extending from an opposite strut. Anti-friction members on the bottoms of at least some of the struts rest on inclined guide surfaces to urge the opposite struts and the side wall member towards each other to close the mould under its own weight. Releasable clamps are provided to maintain the mould closed and lifting gear is provided to lift the straps and so cause the side wall members to pivot outwardly to open the mould.
Inventors
- 👤 R Hamblin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:38
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0029; B28B7/0035; B28B7/0044
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
A mould comprising a base, a pair of side wall members, each of which has a number of vertical struts spaced apart along its length, each strut having a transverse top strap attached to its top end which extends partway across the mould and is pivotally joined at its end remote from the strut to the end of a strap extending from an opposite one of the struts, guide surfaces extending outwardly and upwardly from adjacent the sides of the mold base, a plurality of the struts on both sides being provided with anti-friction members at their bottom ends for engagement with said inclined guide surfaces so as to urge the side wall members towards each other to close the mould under the weight of the members when resting on the guide surfaces, and clamps to releasably secure the bottom ends of the remaining struts in positions to maintain the mould in a closed condition to receive mouldable material.
Claim 2
Dependent Claim
159 words
A mould comprising a base, a pair of side wall members, each of which has a number of vertical struts spaced apart along its length, each strut having a transverse top strap attached to its top end which extends partway across the mould and is pivotally joined at its end remote from the strut to the end of a strap extending from an opposite one of the struts, guide surfaces extending outwardly and upwardly from adjacent the sides of the mold base, a plurality of the struts on both sides being provided with anti-friction members at their bottom ends for engagement with said inclined guide surfaces so as to urge the side wall members towards each other to close the mould under the weight of the members when resting on the guide surfaces, and clamps to releasably secure the bottom ends of the remaining struts in positions to maintain the mould in a closed condition to receive mouldable material.
Claim 3
Dependent Claim
19 words
A mould according to claim 1 in which each of the side wall members is made of sheet metal.
Claim 4
Dependent Claim
18 words
A mould according to claim 1 in which the base of the mould comprises a sheet metal pallet.
Claim 5
Dependent Claim
24 words
A mould according to claim 1 in which said top strap pivoting ends have a Common hinge rod extending the length of the mould.
Claim 6
Dependent Claim
13 words
A mould according to claim 1 in which the anti-friction members are rollers.
Claim 7
Dependent Claim
33 words
A mould according to claim 1 in which each of the clamps comprises a hinged member having a clamping screw for engagement with an inclined surface at the bottom of its corresponding strut.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |