Patent US3589526A successfully refreshed from Google Patents.
US3589526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle-mounted hoist
Assignee: Individual
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Filing: 1969-01-14
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Granted: 1971-06-29
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Expires: 1989-01-14
Abstract
Abstract A box frame reinforced by the walls of oil reservoirs has a prefabricated tubular core sleeve on which mast bearings are assembled in inherent alignment. The structure of the main and jib booms is such as to yield high ratio of strength in relation to weight and the tying of the hinge points of the boom and operating cylinder to each other as well as to the mast gives stability. A worm gear connected to the lower end of the mast provides for 360* rotation accommodated by swiveled hydraulic manifold connections. The stabilizer legs are not only strong per se but brace the hoist frame.
Inventors
- 👤 Frank G Woodside
- 👤 Richard F Uren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:53
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
A hoist comprising a hoist frame, a mast rotatable with respect thereto, and boom means for which the mast provides a transverse fulcrum, the frame comprising a pair of upstanding parallel side members, a central tube received between said side members through which the mast extends, and bracing means connected with the side members and with said tube, the side members of the frame being channel shaped and provided with flanges having upright marginal portions turned inwardly, the bracing means including webs connected to the side members between said flanges and also connected with the inwardly turned flange margins, said webs extending longitudinally of and being connected with said central tube and with said inwardly turned flange margins along their entire length, forming cavities between the side members and said tube.
Claim 2
Dependent Claim
131 words
A hoist comprising a hoist frame, a mast rotatable with respect thereto, and boom means for which the mast provides a transverse fulcrum, the frame comprising a pair of upstanding parallel side members, a central tube received between said side members through which the mast extends, and bracing means connected with the side members and with said tube, the side members of the frame being channel shaped and provided with flanges having upright marginal portions turned inwardly, the bracing means including webs connected to the side members between said flanges and also connected with the inwardly turned flange margins, said webs extending longitudinally of and being connected with said central tube and with said inwardly turned flange margins along their entire length, forming cavities between the side members and said tube.
Claim 3
Dependent Claim
63 words
A hoist according to claim 1 in which the frame includes a top plate spanning said side members and connected therewith and with said bracing means and tube and constituting a top closure for said cavities, and a second plate connected with the lower portions of said bracing means and with said side members and tube and constituting a bottom for said cavities.
References Cited (Backward Citations)
US2645360A
Cited
US2712878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |