US3671015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable hoisting unit
Assignee: Individual
•
Filing: 1970-02-26
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Granted: 1972-06-20
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Expires: 1990-02-26
Abstract
Abstract A foldable base structure has a base frame that is fastened to a roof or other deck and a standard that is pivoted on the frame is raised to a substantially vertical position, in which it is rigidly supported by a brace pivoted at its one end to the frame and fastenable at its other end to the standard. A separate removable crane unit has a post which telescopes in the standard, and swivels relative thereto, and it carries a motor and a winch driven thereby on its upper end in nicely balanced relationship to the post, the hoisting line extending from the winch over a pulley on the outer end of the frame in which the motor and winch are provided. The motor is reversible by manual control and a sprag is manually controlled to lock the winch through its drive gearing in a selected position for safer handling of a load. A hoisting hook of novel design is attached to the line to carry the load.
Inventors
- 👤 Gene F Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:10
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/18; B66C23/20; B66C23/205
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
198 words
In a knockdown, portable hoisting unit, a subassembly comprising a supporting base structure comprising a substantially horizontal generally rectangular frame adapted to be fastened to a support, a standard pivoted at one end to and unfoldable from one end of said frame to an upright position, and a brace also pivoted at one end to and unfoldable from said frame in spaced relation to said standard to an upright position in inclined relationship to said standard and having means for rigidly adjustably connecting the upper end thereof to said standard intermediate the ends thereof to permit angular adjustment of said standard, and a second subassembly comprising a separate crane structure, which is removable from and applicable to said standard comprising an upright supporting post constructed for swivelled, detachable, telescoping relationship with said standard and including an elongated top frame fixed in horizontal transverse relationship to the upper end of said supporting post, a pulley rotatably mounted in one end of said top frame on a substantially horizontal axis, a hoist line extending over said pulley and downwardly therefrom to support a load to be hoisted, and a winch on said top frame on which said line is wound.
Claim 2
Dependent Claim
198 words
In a knockdown, portable hoisting unit, a subassembly comprising a supporting base structure comprising a substantially horizontal generally rectangular frame adapted to be fastened to a support, a standard pivoted at one end to and unfoldable from one end of said frame to an upright position, and a brace also pivoted at one end to and unfoldable from said frame in spaced relation to said standard to an upright position in inclined relationship to said standard and having means for rigidly adjustably connecting the upper end thereof to said standard intermediate the ends thereof to permit angular adjustment of said standard, and a second subassembly comprising a separate crane structure, which is removable from and applicable to said standard comprising an upright supporting post constructed for swivelled, detachable, telescoping relationship with said standard and including an elongated top frame fixed in horizontal transverse relationship to the upper end of said supporting post, a pulley rotatably mounted in one end of said top frame on a substantially horizontal axis, a hoist line extending over said pulley and downwardly therefrom to support a load to be hoisted, and a winch on said top frame on which said line is wound.
Claim 3
Dependent Claim
66 words
A hoisting unit as set forth in claim 1, including reversible power means for turning said winch, the frame extending horizontally in opposite directions from the upper end portion of said post and carrying the reversible power means therein on one side of said post and in substantially balanced relationship to said winch which is carried in said frame on the opposite side of said post.
Claim 4
Dependent Claim
36 words
A hoisting unit as set forth in claim 2, including reduction gearing connected between said winch and power means, and a manually engageable and disengageable sprag in said gearing for temporarily securing said winch against turning.
Claim 5
Dependent Claim
42 words
A hoisting unit as set forth in claim 1, wherein the generally rectangular frame is U-shaped and has a pair of perforated fastener plates pivotally adjustable relative to the two tubular legs of said frame on rods rotatable therein on parallel axes.
Claim 6
Dependent Claim
50 words
A hoisting unit as set forth in claim 4, wherein there is a cross-brace fixed in said frame in spaced parallel relation to the cross-portion of said frame, and the frame has perforated fastener plates secured between these parallel parts in substantially coplanar relation to the bottom of said frame.
Claim 7
Dependent Claim
58 words
A hoisting unit as set forth in claim 1, wherein the generally rectangular frame is U-shaped and there is a cross-brace fixed in said frame in spaced parallel coplanar relation to the cross-portion of said frame, and the frame has perforated fastener plates secured between these parallel parts in substantially coplanar relation to the bottom of said frame.
Claim 8
Dependent Claim
83 words
A hoisting unit as set forth in claim 1, wherein the generally rectangular frame is U-shaped and there is a cross-brace fixed in said frame in spaced parallel coplanar relation to the cross-portion of said frame, and the frame has perforated fastener plates secured between these parallel parts in substantially coplanar relation to the bottom of said frame, there being other perforated fastener plates secured to the remote ends of said legs also in substantially coplanar reLation to the bottom of said frame.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |