US3740812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making expanded metal products
Assignee: Jury & Spiers Pty Ltd
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Filing: 1971-08-18
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Granted: 1973-06-26
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Expires: 1991-08-18
Abstract
Abstract A post comprising a series of struts radiating outwardly from a central portion produced by a method of firstly extruding ductile metal to a constant cross-sectional shape which includes a central portion and at least three circumferentially spaced webs, punching a plurality of rows of slots in each web, arranging the lengths of the slots to be great compared with the distance between them and arranging the slots to be staggered, then stretching the metal between the slots of the rows so as to form a series of struts, the unpierced metal of the product constituting the chords of the trusses so formed.
Inventors
- 👤 T Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:58
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/30; E04C3/32; E04H; E04H12/00; E04H12/02; E04H12/08; E04H12/10; Y; Y10; Y10T; Y10T29/00; Y10T29/18; Y10T29/49; Y10T29/49616; Y10T29/49623; Y10T29/49625; Y10T29/49631
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
234 words
The method of producing an expanded metal product comprising: a. extruding ductile metal to form an extruded product having a constant cross-sectional shape which includes a central portion with at least three circumferentially spaced webs radiating outwardly therefrom, each web terminating at its outer end in an outer portion, and each web having a rib extending along it, each rib being between the outer portion and the central portion, b. removing metal from each web so as to form a row of slots on each side of the rib thereof, the length of each slot exceeding twice the length of metal remaining between either one of its ends and the adjacent end of the next slot in the same row, and the slots on a row on one side of the rib being staggered relative to those of the row on the other side so as to form the rib into a plurality of strut-forming portions, and c. forcing respective said outer portions away from the central portion to thereby incline the strut-forming portions of the ribs relative both to the respective outer portions and to the central portion and at the same time elongate the metal thereof by stretching it, thus forming struts joining respective outer portions and the central portion so as to in turn form trusses, the chords of which are constituted by said central portion and respective said outer portions.
Claim 2
Independent Claim
234 words
The method of producing an expanded metal product comprising: a. extruding ductile metal to form an extruded product having a constant cross-sectional shape which includes a central portion with at least three circumferentially spaced webs radiating outwardly therefrom, each web terminating at its outer end in an outer portion, and each web having a rib extending along it, each rib being between the outer portion and the central portion, b. removing metal from each web so as to form a row of slots on each side of the rib thereof, the length of each slot exceeding twice the length of metal remaining between either one of its ends and the adjacent end of the next slot in the same row, and the slots on a row on one side of the rib being staggered relative to those of the row on the other side so as to form the rib into a plurality of strut-forming portions, and c. forcing respective said outer portions away from the central portion to thereby incline the strut-forming portions of the ribs relative both to the respective outer portions and to the central portion and at the same time elongate the metal thereof by stretching it, thus forming struts joining respective outer portions and the central portion so as to in turn form trusses, the chords of which are constituted by said central portion and respective said outer portions.
Claim 3
Dependent Claim
38 words
A method of producing an expanded metal product according to claim 1 comprising forming each said web to contain only one rib, and forming two rows of said slots with one row on each side of said rib.
Claim 4
Dependent Claim
41 words
A method of producing an expanded metal product according to claim 1 further comprising clamping said outer portions in stretching jaws of a stretching machine, and moving said stretching jaws apart to thereby effect elongation and inclination of said strut-forming portions.
Claim 5
Dependent Claim
54 words
A method of producing an expanded metal product according to claim 1 further comprising clamping said outer portions in stretching jaws of a stretching machine, and moving the jaws of said stretching machine apart by different amounts along their lengths to thereby form a product wherein said outer portions are inclined to one another.
Claim 6
Dependent Claim
26 words
The method of producing an expanded metal product according to claim 1 further comprising extruding said central portion to be of hollow section throughout its length.
Claim 7
Dependent Claim
74 words
A method of producing an expanded metal product according to claim 1 comprising forming each said web to contain a plurality of ribs, forming a row of said slots between the ribs of each adjacent pair of ribs, forming a further row of slots on the outer side of the outermost rib in each web, and forming a still further row of slots on the inner side of the innermost rib of each web.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |