US3796018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural elements for the erection of masts, such as hoist and crane masts, antenna masts etc.
Assignee: AMACO MASKIN AB
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Filing: 1971-11-12
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Granted: 1974-03-12
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Expires: 1991-11-12
Abstract
Abstract A hoist mast composed of planar structural elements each consisting of tube means and cantilever means extending therefrom. The tube means has a male member at one end, a female member at the opposite end, which members together form a bayonet catch, a fastening portion and locking means. When at the erection of a mast two tube means are assembled with the aid of the bayonet catch, the end of the cantilever means is swung into engagement with the fastening portion of another tube means and is interlocked with it, and the locking means of the tube means is swung into locking engagement with the fastening portion of a third tube means to prevent unintentional release of a cantilever means engaging the fastening portion.
Inventors
- 👤 N Holmstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:02
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/18; B66C23/26; B66C23/28; B66C23/283; B66C23/286; E; E04; E04H; E04H12/00; E04H12/02; E04H12/08; E04H12/10; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7005; Y10T403/7007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
262 words
A structural mast having at least three sides and composed of a plurality of identical interengagable structural elements, each element comprising a longitudinal member provided with a male bayonet means at one end and a female bayonet means at the other end, the male bayonet means of a first longitudinal member being securely engaged to the femal bayonet means of a second longitudinal member by relative axial rotation to be coaligned therewith, each longitudinal member being provided with a cantilever means including an upper cantilever arm extending outwardly substantially normal to said longitudinal member and a brace means extending upwardly from said longitudinal member to the outer end of said cantilever arm, a first locking means disposed at the outer end of said cantilever arm, a second locking means disposed at one end of said longitudinal member adjacent the inner end of said cantilever arm, and a third locking means disposed at the end of said longitudinal member opposed from said second locking means and in the same vertical plane as said second locking means, the first locking means at the end of the cantilever arm of the first longitudinal member engaging the second locking means of a third longitudinal member disposed laterally of said first longitudinal member and pin means securing the engagement of saiD first and second locking means, and the third locking means of a fourth longitudinal member engaged coextensively with said third longitudinal member preventing removal of said pin means securing the engagement of the first and second locking means of the first and third longitudinal member respectively.
Claim 2
Dependent Claim
262 words
A structural mast having at least three sides and composed of a plurality of identical interengagable structural elements, each element comprising a longitudinal member provided with a male bayonet means at one end and a female bayonet means at the other end, the male bayonet means of a first longitudinal member being securely engaged to the femal bayonet means of a second longitudinal member by relative axial rotation to be coaligned therewith, each longitudinal member being provided with a cantilever means including an upper cantilever arm extending outwardly substantially normal to said longitudinal member and a brace means extending upwardly from said longitudinal member to the outer end of said cantilever arm, a first locking means disposed at the outer end of said cantilever arm, a second locking means disposed at one end of said longitudinal member adjacent the inner end of said cantilever arm, and a third locking means disposed at the end of said longitudinal member opposed from said second locking means and in the same vertical plane as said second locking means, the first locking means at the end of the cantilever arm of the first longitudinal member engaging the second locking means of a third longitudinal member disposed laterally of said first longitudinal member and pin means securing the engagement of saiD first and second locking means, and the third locking means of a fourth longitudinal member engaged coextensively with said third longitudinal member preventing removal of said pin means securing the engagement of the first and second locking means of the first and third longitudinal member respectively.
Claim 3
Dependent Claim
117 words
A structural mast as claimed in claim 1 wherein said male bayonet means comprises a pin extending in the longitudinal direction of the longitudinal member and having adjacent its free end projections extending transversely of the longitudinal member, said female bayonet member comprising an end plate fastened at the opposed end of the longitudinal member and provided with a hole therein and having recesses extending outwardly from the periphery of the hole through which said projections may be passed, said recesses being oriented at least 30* offset in their end plane in relation to the projections so that two of said longitudinal members are interlocked by engagement of said projections with the underside of said end plate.
Claim 4
Dependent Claim
61 words
A structural mast as claimed in claim 1, wherein said first locking means includes a bore therethrough, and said second locking means including two fork arms each having a bore therethrough, said first locking means being inserted between the fork arms so that its bore registers with the bores in said fork arms, said pin means being inserted in said bores.
Claim 5
Dependent Claim
53 words
A structural mast as claimed in claim 1, wherein said second locking means on the third longitudinal member is disposed in an axial plane at an angle to the axial plane of the cantilever means on said third member and is in alignment with said first locking means on said first longitudinal member.
Claim 6
Dependent Claim
16 words
A structural mast as claimed in claim 1, wherein said third locking means comprises a stud.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |