US4134473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable scaffold
Assignee: Individual
•
Filing: 1977-10-19
•
Granted: 1979-01-16
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Expires: 1997-10-19
Abstract
Abstract A portable scaffolding comprising a plank with frame members supporting each end thereof. The frame members include legs of steel angles which are interconnected at their lower portions by toggle arms for collapsing, and at their upper ends by threaded members for adjusting the spacing thereof. Inwardly facing channel members on the upper ends of the legs are received over the opposite edges of the plank. Another pair of channel members adapted to be received over the edges of the plank are also drawn together by threaded members, and depending from one of them is a step to facilitate stepping up onto the scaffold.
Inventors
- 👤 Herbert E. Prior
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:21
CPC Classifications
E; E04; E04G; E04G1/00; E04G1/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
238 words
A portable scaffold comprising: a plank; and a pair of frame members supporting the ends of said plank; each of said frame members comprising; a pair of legs; inwardly facing channel members carried on the upper ends of said legs; said channel members being of an inside width to receive the edge portions of said plank; a pair of toggle arms interconnecting said legs intermediate the lengths thereof; and complementary means each pivotally connected near the upper end of one of said legs for adjusting the spacing therebetween; an externally threaded rod slidably extending through one of said legs; a crank on said rod; and a complementary internally threaded member on the other of said legs; said legs being conditioned for limited pivotal movement about their connections with said complementary means when said toggle arms are collapsed to withdraw said channel members from a position firmly gripping said plank to a retracted position wherein said plank is slidable but retained therein, including a step to said plank comprising; a pair of rigid depending members; a rigid step member interconnecting said depending members near the lower ends thereof; a first channel member interconnecting the top ends of said depending member and received over an edge portion of said plank; a second channel member facing said first channel member and received over the opposite edge of said plank; and threaded means interconnecting said channel members for adjusting the spacing therebetween.
Claim 2
Dependent Claim
238 words
A portable scaffold comprising: a plank; and a pair of frame members supporting the ends of said plank; each of said frame members comprising; a pair of legs; inwardly facing channel members carried on the upper ends of said legs; said channel members being of an inside width to receive the edge portions of said plank; a pair of toggle arms interconnecting said legs intermediate the lengths thereof; and complementary means each pivotally connected near the upper end of one of said legs for adjusting the spacing therebetween; an externally threaded rod slidably extending through one of said legs; a crank on said rod; and a complementary internally threaded member on the other of said legs; said legs being conditioned for limited pivotal movement about their connections with said complementary means when said toggle arms are collapsed to withdraw said channel members from a position firmly gripping said plank to a retracted position wherein said plank is slidable but retained therein, including a step to said plank comprising; a pair of rigid depending members; a rigid step member interconnecting said depending members near the lower ends thereof; a first channel member interconnecting the top ends of said depending member and received over an edge portion of said plank; a second channel member facing said first channel member and received over the opposite edge of said plank; and threaded means interconnecting said channel members for adjusting the spacing therebetween.
Claim 3
Dependent Claim
20 words
The portable scaffold defined by claim 1 including a pair of arms interconnecting said depending members and said second channel.
Claim 4
Dependent Claim
66 words
A step for a plank scaffold comprising; a pair of rigid depending members; a rigid step member interconnecting said depending members near the lower ends thereof; a pair of facing channel members of an inner width to receive the side edges of a plank; and threaded means interconnecting said channel means; one of said channel members being secured between the upper ends of said depending members.
Claim 5
Dependent Claim
66 words
A step for a plank scaffold comprising; a pair of rigid depending members; a rigid step member interconnecting said depending members near the lower ends thereof; a pair of facing channel members of an inner width to receive the side edges of a plank; and threaded means interconnecting said channel means; one of said channel members being secured between the upper ends of said depending members.
Claim 6
Dependent Claim
23 words
The step defined by claim 3 including: a pair of arms secured between said depending members and the others of said channel members.
Claim 7
Dependent Claim
19 words
The portable scaffold defined by claim 11 including; means for adjusting the effective lengths of said pair of arms.
References Cited (Backward Citations)
US2938596A
Cited
US3139951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |