US4562718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pallet and method of production
Assignee: PRECISION TOOL & GAUGE Pty Ltd 622 PORT ROAD BEVERLEY SOUTH AUSTRALIA COMMONWEALTH OF AUSTRALIA
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Filing: 1984-03-08
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Granted: 1986-01-07
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Expires: 2004-03-08
Abstract
Abstract A sheet metal workpiece is formed to have a plurality of relatively large diameter but relatively shallow cup-like depressions in a first draw operation, to have the shapes of the cup-like depressions changed in a subsequent draw operation and to form the base of the central cup-like depression into a secondary cup-like depression in a further draw operation.
Inventors
- 👤 Robert J. Dunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:14
CPC Classifications
B; B65; B65D; B65D19/00; B65D19/0004; B65D19/0006; B65D19/003; B65D19/0032; B65D19/0036; B65D19/004; B21; B21D; B21D13/00; B21D13/10; B21D53/00; B65D2519/00; B65D2519/00004; B65D2519/00009; B65D2519/00014; B65D2519/00024; B65D2519/00049; B65D2519/00059; B65D2519/00258; B65D2519/00263; B65D2519/00268; B65D2519/00283; B65D2519/00288; B65D2519/00313; B65D2519/00318; B65D2519/00328; B65D2519/00338; B65D2519/00398; B65D2519/00402; B65D2519/00407; B65D2519/00736; B65D2519/008
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
191 words
A method of pallet production, comprising pressing a planar sheet metal workpiece in a first draw operation in a press so as to form a cup-like central depression and eight cup-like peripheral depressions, all of generally circular shape in plan and all having bases at least portions of which are of curved cross-sectional shape, the depressions being in a symmetrical pattern, the eight cup-like peripheral depressions being of identical shape and size, but the central depression being of larger diameter and less depth than any of the peripheral depressions, subjecting the workpiece to a further draw operation in a press so as to further form all said depressions to a greater depth and smaller diameter, and a discoid end in each of the peripheral depressions, and at least partly flattening the end of the central depression, said further draw operation forming the peripheral depressions to approximately the same depth, but the central depression to a lesser depth, and subjecting the workpiece to a still further draw operation so as to form a minor depression in the end of the central depression only, such that all depressions then have the same depth.
Claim 2
Independent Claim
191 words
A method of pallet production, comprising pressing a planar sheet metal workpiece in a first draw operation in a press so as to form a cup-like central depression and eight cup-like peripheral depressions, all of generally circular shape in plan and all having bases at least portions of which are of curved cross-sectional shape, the depressions being in a symmetrical pattern, the eight cup-like peripheral depressions being of identical shape and size, but the central depression being of larger diameter and less depth than any of the peripheral depressions, subjecting the workpiece to a further draw operation in a press so as to further form all said depressions to a greater depth and smaller diameter, and a discoid end in each of the peripheral depressions, and at least partly flattening the end of the central depression, said further draw operation forming the peripheral depressions to approximately the same depth, but the central depression to a lesser depth, and subjecting the workpiece to a still further draw operation so as to form a minor depression in the end of the central depression only, such that all depressions then have the same depth.
Claim 3
Dependent Claim
27 words
A method according to claim 1 further comprising deepening the peripheral depressions simultaneously with said forming of a minor depression in the end of the central depression.
Claim 4
Dependent Claim
46 words
A method according to claim 1 further comprising forming a first group of ribs in the workpiece simultaneously with forming said minor depression in the end of the central depression, said first group of ribs extending between the peripheral depressions and terminating in the walls thereof.
Claim 5
Dependent Claim
68 words
A method according to claim 3 further comprising trimming the edge of the metal by a trim action, piercing the discoid ends of the depressions, and, in a further operation, forming a second group of ribs radiating outwardly from the central depression to respective peripheral depressions, and terminating at their ends in the walls of said depressions, while simultaneously forming a peripheral flange in that said further operation.
Claim 6
Dependent Claim
20 words
A method according to claim 4 further comprising in a still further operation, curling the edge of the peripheral flange.
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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |