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Patent US3774274A successfully refreshed from Google Patents.
US3774274A
Expired / Lapsed
US
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Means and method for producing expanded metal
Assignee: Jury & Spiers Pty Ltd
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Filing: 1971-07-13
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Granted: 1973-11-27
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Expires: 1991-07-13
Abstract
Abstract The invention relates to a method of producing an expanded metal product wherein the metal sections are stretched instead of being bent so as to achieve the expanding process. The method is characterised by forming a series of parallel rows of slots each of identical size and each having curved ends, the slots of alternate rows being staggered and overlapping so as to form a series of longitudinally extending stretchable portions, the metal edges being clamped and then moved apart in a transverse direction so as to strain the stretchable portions beyond their yield point and to incline them to the longitudinal direction.
Inventors
- 👤 H Jury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:22
CPC Classifications
B; B21; B21D; B21D47/00; B21D47/01; B21D47/02; Y; Y10; Y10T; Y10T29/00; Y10T29/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
The method of producing an expanded metal product which comprises the steps of advancing a ductile metal member between a set of rotatable roll shears to at least partly perforate the member so as to at least partly form a plurality of slots extending substantially longitudinally in the direction of the advance, the slots being of identical shape and size and having curved ends, and being equally spaced in each of a series of parallel rows the longitudinal axes of which are coincident with the longitudinal axes of the slots, the pitch centre distance of the slots in any one row being only slightly greater than the slot length and the slots of any row being staggered with respect to the slots of the next adjacent row, clamping the partly perforated metal member between a pair of jaws, displacing said jaws away from each other in a direction transverse to the longitudinal axes of the slots until the ductile member is strained beyond the yield point to complete the shearing of the slots and releasing the clamp jaws from the transversely expanded metal member.
Claim 2
Independent Claim
184 words
The method of producing an expanded metal product which comprises the steps of advancing a ductile metal member between a set of rotatable roll shears to at least partly perforate the member so as to at least partly form a plurality of slots extending substantially longitudinally in the direction of the advance, the slots being of identical shape and size and having curved ends, and being equally spaced in each of a series of parallel rows the longitudinal axes of which are coincident with the longitudinal axes of the slots, the pitch centre distance of the slots in any one row being only slightly greater than the slot length and the slots of any row being staggered with respect to the slots of the next adjacent row, clamping the partly perforated metal member between a pair of jaws, displacing said jaws away from each other in a direction transverse to the longitudinal axes of the slots until the ductile member is strained beyond the yield point to complete the shearing of the slots and releasing the clamp jaws from the transversely expanded metal member.
Claim 3
Dependent Claim
65 words
A method of producing an expanded metal product according to claim 1 wherein each of said slots is partly formed by partly shearing said ductile metal member to form a slug, partly sheared metal retaining the slug to the ductile metal member until said jaws are displaced away from each other said displacing tearing said partly sheared metal and removing said slugs from the member.
Claim 4
Dependent Claim
35 words
A method of producing an expanded metal product according to claim 1 wherein each of said slots is formed by fully shearing a slug from said ductile metal member before said clamping of the member.
Claim 5
Dependent Claim
26 words
A method of producing an expanded metal product according to claim 1 wherein said ductile metal member is a sheet of a metal having constant thickness.
Claim 6
Dependent Claim
34 words
A method of producing an expanded metal product according to claim 1 wherein said ductile metal member has a constant cross-section sectional shape which includes a plurality of spaced flanges joined by narrow webs.
Claim 7
Dependent Claim
35 words
A method of producing an expanded metal product according to claim 5 wherein one of said rolls bear against said flanges while projections on the other roll shear portions of said web between the flanges.
References Cited (Backward Citations)
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US1103033A
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US1802011A
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US2290486A
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US3351995A
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |