US3890757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boom members having stiffener elements for crane boom constructions
Assignee: Case LLC
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Filing: 1974-02-28
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Granted: 1975-06-24
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Expires: 1994-02-28
Abstract
Abstract A multisection crane boom construction is disclosed herein. The various boom sections are each formed of a plurality of members which are interconnected in a unique fashion and are reinforced to provide boom sections that have a high strength-to-weight ratio and provide both vertical and lateral rigidity. Each boom section consists of a pair of elongated channel members having webs and flanges with the flanges being interconnected by connecting members and the webs being reinforced by web stiffeners to increase the buckling resistance of the web portions.
Inventors
- 👤 Gerald P Lamer
- 👤 Terry M Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:24
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/04; E04C3/08; B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; E04C2003/0404; E04C2003/0408; E04C2003/0413; E04C2003/0426; E04C2003/0434; E04C2003/0443; E04C2003/0452; E04C2003/0465; E04C2003/0473
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A boom for a crane or the like comprising an elongated hollow member having a plurality of flat walls, at least one of said walls having a plurality of openings spaced from each other, a stiffening element located between each adjacent pair of openings, each stiffening element having a central core generally aligned with a longitudinal center line for said at least one wall and a plurality of arms extending from said central core to the outer edges of said at least one member, said stiffening elements being secured to a surface of said at least one wall between said openings and reinforcing the edges of said openings, and a plurality of buttons each having a dimension greater than the dimension of said cores, said buttons overlying respective central cores and being secured to said surface.
Claim 2
Dependent Claim
136 words
A boom for a crane or the like comprising an elongated hollow member having a plurality of flat walls, at least one of said walls having a plurality of openings spaced from each other, a stiffening element located between each adjacent pair of openings, each stiffening element having a central core generally aligned with a longitudinal center line for said at least one wall and a plurality of arms extending from said central core to the outer edges of said at least one member, said stiffening elements being secured to a surface of said at least one wall between said openings and reinforcing the edges of said openings, and a plurality of buttons each having a dimension greater than the dimension of said cores, said buttons overlying respective central cores and being secured to said surface.
Claim 3
Dependent Claim
89 words
A boom as defined in claim 1, in which said hollow member is defined by a pair of elongated channel members, each having a web portion and flanges at opposite edges of said web portion, said channel members being positioned so that said web portions define a pair of said flat walls and said flanges of respective channels extend towards each other with free edges spaced from each other, and a pair of interconnecting members connecting adjacent pairs of flanges to define a further pair of said flat walls.
Claim 4
Dependent Claim
25 words
A boom as defined in claim 2, in which both of said web portions have openings, stiffening elements and buttons as defined in claim 7.
Claim 5
Dependent Claim
24 words
A boom as defined in claim 3, further including elongated reinforcing plates located adjacent the intersection of each flange with its adjacent web portion.
Claim 6
Dependent Claim
20 words
A boom as defined in claim 4, in which said elongated reinforcing plates include an angle iron at each intersection.
Claim 7
Dependent Claim
30 words
A boom as defined in claim 3, in which said stiffener elements are generally X-shaped in plan view and said openings diamond shaped to produce a semi-closed lattice boom construction.
Claim 8
Dependent Claim
26 words
A boom as defined in claim 1, in which said surface is an inside surface of at least one of said walls of said hollow member.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |