Patent US3572528A successfully refreshed from Google Patents.
US3572528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniform stress cantilever beam
Assignee: Case LLC
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Filing: 1969-05-14
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Granted: 1971-03-30
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Expires: 1989-05-14
Abstract
Abstract A cantilever beam for use as a safety frame or a loader boom arm for a tractor having angle or channel members forming an enclosed hollow section beam. The members are secured together by welds which are spaced at progressively wider intervals from the supported end of the beam so that the stress created by a load imposed at the free end of the beam is substantially uniformly distributed along the length thereof.
Inventors
- 👤 Michael D Morton
- 👤 Richard R Conners
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:56
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/38; B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; E02F3/34
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A cantilever beam comprising: a pair of channel members having one end fixed and the other end free; weld means securing said channel members together to define a hollow box section; said weld means being spaced progressively farther apart and of progressively shorter length from said fixed end; and whereby the beam is substantially uniformly stressed along its length when a load is applied at said free end.
Claim 2
Dependent Claim
68 words
A cantilever beam comprising: a pair of channel members having one end fixed and the other end free; weld means securing said channel members together to define a hollow box section; said weld means being spaced progressively farther apart and of progressively shorter length from said fixed end; and whereby the beam is substantially uniformly stressed along its length when a load is applied at said free end.
Claim 3
Dependent Claim
86 words
A cantilever beam comprising: a plurality of elongated members having one end fixed and the other end free; weld means securing said members together to define an enclosed hollow section; said weld means being of irregular length and spaced at irregular intervals along said members; said weld means being longest at said fixed end and being progressively shorter and spaced further apart toward said free end; and whereby the beam is substantially uniformly stressed throughout its length when a load is applied to said free end.
Claim 4
Dependent Claim
86 words
A cantilever beam comprising: a plurality of elongated members having one end fixed and the other end free; weld means securing said members together to define an enclosed hollow section; said weld means being of irregular length and spaced at irregular intervals along said members; said weld means being longest at said fixed end and being progressively shorter and spaced further apart toward said free end; and whereby the beam is substantially uniformly stressed throughout its length when a load is applied to said free end.
Claim 5
Dependent Claim
86 words
A safety frame for a tractor comprising: a pair of upward extending posts secured at one end to the tractor and the other end being free; each said posts consisting of a plurality of elongated members; and weld means securing said members together to define an enclosed hollow section; and said weld means being spaced progressively farther apart and of progressively shorter length of said posts from said one end; whereby the posts are substantially uniformly stressed along their length when loaded at their free ends.
Claim 6
Dependent Claim
86 words
A safety frame for a tractor comprising: a pair of upward extending posts secured at one end to the tractor and the other end being free; each said posts consisting of a plurality of elongated members; and weld means securing said members together to define an enclosed hollow section; and said weld means being spaced progressively farther apart and of progressively shorter length of said posts from said one end; whereby the posts are substantially uniformly stressed along their length when loaded at their free ends.
Claim 7
Dependent Claim
18 words
A safety frame according to claim 3 wherein said members consist of a pair of U-shaped channel members.
Claim 8
Dependent Claim
15 words
A safety frame according to claim 4 wherein said channel members have a straight taper.
Claim 9
Dependent Claim
15 words
A safety frame according to claim 3 wherein said members consist of four L-shaped angles.
Claim 10
Dependent Claim
82 words
A boom arm for a tractor loader, comprising: a plurality of members rotatably mounted at one end to said tractor loader, weld means securing said members together to define an enclosed hollow section; said weld means being of irregular length and spaced at irregular intervals along said members; and said weld means being longest at said one end and being progressively shorter and spaced farther apart away from said one end; whereby said boom arm is substantially uniformly stressed throughout its length.
Claim 11
Dependent Claim
82 words
A boom arm for a tractor loader, comprising: a plurality of members rotatably mounted at one end to said tractor loader, weld means securing said members together to define an enclosed hollow section; said weld means being of irregular length and spaced at irregular intervals along said members; and said weld means being longest at said one end and being progressively shorter and spaced farther apart away from said one end; whereby said boom arm is substantially uniformly stressed throughout its length.
Claim 12
Dependent Claim
18 words
A boom arm according to claim 7 wherein said members consist of a pair of U-shaped channel members.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |