US3666046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable scaffold
Assignee: Individual
•
Filing: 1971-01-19
•
Granted: 1972-05-30
•
Expires: 1991-01-19
Abstract
Abstract Described herein is a portable, vertically adjustable, scaffold. This scaffold comprises a base, a telescoping mast hingeably attached thereto and a platform. The telescoping mast is raised by a hydraulic hoist and the mast is rotated about its lower end with a hydraulic hoist. As the telescoping mast is raised, a cable secured to the mast raises the platform assembly along the mast. Outriggers are provided to add stability to the scaffold.
Inventors
- 👤 Clarence A Meinecke Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:24
CPC Classifications
E; E04; E04G; E04G1/00; E04G1/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
174 words
A portable, vertically adjustable, scaffold comprising: base means; a telescoping mast having an inside, elongated tube hingeably attached at the lower end thereof to said base means and rotatable about said lower end from an essentially horizontal position to a vertical position; an outside, elongated tube mating over said inside tube and slidingly engaged with said inside tube; and first hydraulic means secured to said inside tube and connected to said outside tube for raising said outside tube relative to said inside tube; second hydraulic means for rotating said mast about said lower end of said inside tube; a platform assembly arranged for vertical guiding movement along said outside tube when said mast is in a vertical position; at least one cable having two ends, one of said ends being secured to said platform and the other of said ends being secured to said mast so that said platform is raised when said outside tube is raised; and outrigger means adjustably secured to said base means for adding stability to said vertically adjustable scaffold.
Claim 2
Dependent Claim
174 words
A portable, vertically adjustable, scaffold comprising: base means; a telescoping mast having an inside, elongated tube hingeably attached at the lower end thereof to said base means and rotatable about said lower end from an essentially horizontal position to a vertical position; an outside, elongated tube mating over said inside tube and slidingly engaged with said inside tube; and first hydraulic means secured to said inside tube and connected to said outside tube for raising said outside tube relative to said inside tube; second hydraulic means for rotating said mast about said lower end of said inside tube; a platform assembly arranged for vertical guiding movement along said outside tube when said mast is in a vertical position; at least one cable having two ends, one of said ends being secured to said platform and the other of said ends being secured to said mast so that said platform is raised when said outside tube is raised; and outrigger means adjustably secured to said base means for adding stability to said vertically adjustable scaffold.
Claim 3
Dependent Claim
17 words
The portable scaffold of claim 1 wherein said first hydraulic means is disposed inside said inside tube.
Claim 4
Dependent Claim
32 words
The portable scaffold of claim 1 wherein a locking arm is rotatably secured to said base means, said locking arm securable to said mast when said mast is in an upright position.
Claim 5
Dependent Claim
79 words
The portable scaffold of claim 3 wherein a two-way valve controls the flow of hydraulic fluid into said first hydraulic means and said second hydraulic means, said two-way valve being mechanically connected to said locking arm and allowing hydraulic fluid to flow into said first hydraulic means only when said locking arm is secured to said mast and allowing hydraulic fluid to flow into said second hydraUlic means only when said locking arm is not secured to said mast.
Claim 6
Dependent Claim
69 words
The portable scaffold of claim 4 wherein said platform assembly comprises: a platform deck disposed rearwardly of said mast when said mast is in a vertical position; two vertical struts of inverted L-shaped configuration secured to said deck on opposite sides of said mast; a plurality of wheel means secured to said deck and said struts for guiding said platform deck vertically along said outside tube of said mast.
Claim 7
Dependent Claim
70 words
The portable scaffold of claim 5 wherein at least one pulley is secured proximate the upper end of said outside tube; one end of said cable is secured to the platform deck by side strap means, and said other end of said cable is secured proximate the upper end of said inside tube, said cable passing upwardly through said outside tube and around said pulley to said side strap means.
Claim 8
Dependent Claim
20 words
The portable scaffold of claim 6 wherein said base means comprises I-beams disposed at right angles and rigidly secured together.
Claim 9
Dependent Claim
67 words
The portable scaffold of claim 7 wherein said outrigger means comprises: arcuate arms slidably secured on opposite sides of said portable scaffold and extending outwardly thereof, each of the outer ends of said arcuate arms terminating in an attachment cylinder; jack extensions secured on said attachment cylinders and rotatable thereon; said jack extensions capable of reaching the ground when said portable scaffold is mounted on a truck.
References Cited (Backward Citations)
US2423167A
Cited
US2632530A
Cited
US3279563A
Cited
US3344885A
Cited
US3378101A
Cited
US3493079A
Cited
US3576233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |