US4053025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scaffold including reversible and adjustable driving and steering unit
Assignee: Individual
•
Filing: 1976-07-14
•
Granted: 1977-10-11
•
Expires: 1996-07-14
Abstract
Abstract A simple and versatile knock-down scaffold structure is provided, complete in itself, supported on four normally inert corner wheels, and capable, through adjustment and/or substitution of parts, to be varied in length, width and/or height, is modified by the optional addition of a power driving and steering unit comprising a fifth wheel and a reversible, variable speed driving motor therefor, through which the scaffold may be driven forward or backward, being desirably steered and controlled as to speed and direction by a workman on the scaffold. The power driving and steering unit may be varied in height to accommodate whatever variations of height are available in the conventional scaffold structure. It may also be varied in ground pressure to increase the driving traction as desired.
Inventors
- 👤 John A. Slusarenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:53
CPC Classifications
E; E04; E04G; E04G1/00; E04G1/24; E04G1/28; E04G1/32; E04G2001/242; E04G2001/244
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A scaffold including, in combinaton, a steering and driving unit which scaffold has a front end frame member that includes roller supported corner posts, cross-bars that connect the corner posts, and a vertical intermediate steering and driving bar, and said unit having, in combination, a. a drive wheel, b. a wheel and motor supporting frame on which the drive wheel is revolably mounted, c. carrying means for the motor supporting frame adapted for attachment to an end frame member of the scaffold, d. a reversible, variable speed wheel driving motor carried by said motor supporting frame, e. driving connections between the motor and the drive wheel, and f. steering means at the forward end of the scaffold conveniently accessible to an occupant of the scaffold for controlling the direction in which the drive wheel points, the drive wheel frame being carried by a drive wheel stem having supporting plural prong hangers which hang on cross-bars of the scaffold end frame member and embrace a vertical bar thereof.
Claim 2
Dependent Claim
167 words
A scaffold including, in combinaton, a steering and driving unit which scaffold has a front end frame member that includes roller supported corner posts, cross-bars that connect the corner posts, and a vertical intermediate steering and driving bar, and said unit having, in combination, a. a drive wheel, b. a wheel and motor supporting frame on which the drive wheel is revolably mounted, c. carrying means for the motor supporting frame adapted for attachment to an end frame member of the scaffold, d. a reversible, variable speed wheel driving motor carried by said motor supporting frame, e. driving connections between the motor and the drive wheel, and f. steering means at the forward end of the scaffold conveniently accessible to an occupant of the scaffold for controlling the direction in which the drive wheel points, the drive wheel frame being carried by a drive wheel stem having supporting plural prong hangers which hang on cross-bars of the scaffold end frame member and embrace a vertical bar thereof.
Claim 3
Dependent Claim
53 words
A scaffold steering and driving unit as set forth in claim 1 in which the wheel supporting frame is carried at the lower end of the vertically extending drive wheel stem and provision is made of spring means for thrusting the frame and the wheel carried by it downward with regulated, predetermined pressure.
Claim 4
Dependent Claim
79 words
A scaffold steering and driving unit as set forth in claim 2 in which the means for thrusting the wheel carrying frame downward comprises a lower hollow stem affixed to the wheel and motor carrying frame, an inner stem telescopically received in the lower stem, and a compression coil spring within the lower stem, constructed and arranged to apply an upward thrust to the inner stem, and a resilient downward thrust to the wheel and motor carrying outer stem.
Claim 5
Dependent Claim
37 words
A scaffold steering and driving unit as set forth in claim 1 in which the hangers include sleeves in which upper and lower portions of the stem are revolvably mounted for turning in unison with one another.
Claim 6
Dependent Claim
50 words
A scaffold steering and driving unit as set forth in claim 4 in which a steering column is provided as an upward extension of the stem together with means for adjusting the exposed length of the steering column, and a handle bar device is vertically adjustable on the steering column.
Claim 7
Dependent Claim
51 words
A scaffold steering and driving unit as set forth in claim 5 in which the handle bar includes a supporting member adjustably mounted on the steering column, a stem pivotally mounted for up and down movement on said supporting member, and a pair of divergent handle bars unitary with said stem.
Claim 8
Dependent Claim
147 words
A knock-down scaffold comprising, in combination, a. front and rear rigid end frame members, each of which includes a pair of corner posts, each post having a freely pivotal roller caster at its lower end and an offset wheel mounted on the caster, a plurality of cross-connecting bars available as platform supports at different levels, and an intermediate vertical bar, b. means rigidly connecting said front and rear rigid frame members to one another, c. a steerable driving roller mounted at one end of the scaffold together with power means for driving said roller, and d. a locking bar adapted for application to the rear casters for locking the rear casters in straight-ahead positions, the construction and arrangement being such that the front corner rollers will automatically assume the direction of the driving roller, but the rear corner rollers will be always compelled to point straight ahead.
Claim 9
Dependent Claim
147 words
A knock-down scaffold comprising, in combination, a. front and rear rigid end frame members, each of which includes a pair of corner posts, each post having a freely pivotal roller caster at its lower end and an offset wheel mounted on the caster, a plurality of cross-connecting bars available as platform supports at different levels, and an intermediate vertical bar, b. means rigidly connecting said front and rear rigid frame members to one another, c. a steerable driving roller mounted at one end of the scaffold together with power means for driving said roller, and d. a locking bar adapted for application to the rear casters for locking the rear casters in straight-ahead positions, the construction and arrangement being such that the front corner rollers will automatically assume the direction of the driving roller, but the rear corner rollers will be always compelled to point straight ahead.
Claim 10
Dependent Claim
103 words
A knock-down scaffold as set forth in claim 7 in which each corner post at at least one end of the scaffold includes arms that extend horizontally from the corner roller caster shafts, cams pivotally mounted on the free ends of said arms and having upstanding handle portions, a brake member slidably mounted on each pair of horizontal arms, and a bar constructed and arranged to be fitted onto the upstanding portions of said cams, and serving both normally to preclude turning of the rollers significantly away from a straight-away attitude, and when depressed to lock both of the rollers simultaneously against rotation.
References Cited (Backward Citations)
US3023825A
Cited
US3232375A
Cited
US3256954A
Cited
SE309087B
Cited
US3731758A
Cited
US3865203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |