US4941547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety featured ladder scaffolding
Assignee: Individual
•
Filing: 1989-09-25
•
Granted: 1990-07-17
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Expires: 2009-09-25
Abstract
Abstract A wall scaffold using a pair of ladders equipped with ladder jacks for supporting a horizontal work platform. The invention includes numerous safety features such as a safety railing on standards attached to the outboard ends of the ladder jacks, a paint bucket trolley for the railing, an adjustable anti-flexing brace between the central part of the ladder and the wall to prevent bouncing of the ladder and platform, a unique safety clamp for tightly securing components to the ladder rungs, a ladder level adjuster, an auxiliary step to assist in mounting and dismounting the work platform, and a safety stake attachable to the lowest ladder rung to prevent bottom "slip-out".
Inventors
- 👤 Lester R. Livick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:37
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44; E06C7/16; E06C7/48
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
187 words
A wall supported scaffold formed of first and second ladders each having a lower end and a top end and a plurality of substantially equally spaced rungs, said ladders being spaced apart with their top ends leaning against a common wall, said scaffold including: a ladder jack secured by rung locking means to each of said ladders, said jack having a substantially horizontal platform plank supporting member; and an antiflexing brace coupled between a rung on each of said ladders and the common wall, said brace having a tubular member with first and second ends, the first end of said tubular member being pivotally secured by rung locking means to a rung of its ladder, a second member having first and second ends, the first end of said second member being slideable into bore in the second end of said tubular member, the second end of said second member supporting a wall pad for contacting said common wall, and an adjustment member overlying said tubular member and attached to the second end of said second member for adjusting and locking the overall length of said antiflexing brace.
Claim 2
Dependent Claim
187 words
A wall supported scaffold formed of first and second ladders each having a lower end and a top end and a plurality of substantially equally spaced rungs, said ladders being spaced apart with their top ends leaning against a common wall, said scaffold including: a ladder jack secured by rung locking means to each of said ladders, said jack having a substantially horizontal platform plank supporting member; and an antiflexing brace coupled between a rung on each of said ladders and the common wall, said brace having a tubular member with first and second ends, the first end of said tubular member being pivotally secured by rung locking means to a rung of its ladder, a second member having first and second ends, the first end of said second member being slideable into bore in the second end of said tubular member, the second end of said second member supporting a wall pad for contacting said common wall, and an adjustment member overlying said tubular member and attached to the second end of said second member for adjusting and locking the overall length of said antiflexing brace.
Claim 3
Dependent Claim
55 words
The scaffold claimed in claim 1 wherein said rung locking means includes a cylinder longitudinally split into first and second halves for tight reassembly around a ladder rung and securing means for tightly securing together said first and second halves, one of said halves being weldable to a member to be attached to said rung.
Claim 4
Dependent Claim
16 words
The scaffold claimed in claim 2 wherein said securing means is a U-bolt and U-bolt base.
Claim 5
Dependent Claim
42 words
The scaffold claimed in claim 2 further including an auxiliary platform step attached to a ladder jack to said ladder rungs by said rung locking means and extending from said ladder for assisting in the mounting and dismounting of a work platform.
Claim 6
Dependent Claim
30 words
The scaffold claimed in claim 2 further including a socket member attached to the outboard end of each of said horizontal plank supporting members, said socket being substantially vertically aligned.
Claim 7
Dependent Claim
49 words
The scaffold claimed in claim 5 further including a rail standard insertable into said socket member, said standard having a lower end insertable into said socket member and a bifurcated upper end for receiving and securing a safety rail having a top surface and first and second side surfaces.
Claim 8
Dependent Claim
66 words
The scaffold claimed in claim 6 further including a rolling hook assembly for moving a bailed container along said safety rail, said rolling hook including a housing containing at least one horizontal roller contacting the top surface of said rail, at least one vertical roller contacting the first side surface of said rail, and a screw lock for contacting the second side surface of said rail.
Claim 9
Dependent Claim
45 words
The scaffold claimed in claim 6 further including a bail hook comprising a metal strip formed around the top surface and first and second side surfaces of said safety rail and having a plurality of outwardly extending hooks formed in at least one side surface.
Claim 10
Dependent Claim
75 words
The scaffold claimed in claim 1 further including a level adjuster attachable to the lowest rung on said ladder, said adjuster having a base, a tubular member attached to said base and having a smooth top surface and a vertical bore, a threaded shaft within said bore and having a ladder rung attachment at its top end, and a rotatable nut threaded on said shaft and bearing on the top surface of said tubular member.
Claim 11
Dependent Claim
56 words
The scaffold claimed in claim 1 further including a safety stake assembly including a plate member secured to the lowest rung of a ladder and extending substantially horizontally outward from said rung, said plate having an opening therethrough for a stake which, when driven into the ground, prevents movement of the bottom end of said ladder.
Claim 12
Dependent Claim
39 words
The scaffold claimed in claim 10 further including a metal safety stake for passing through said opening in said plate menter, said stake having spaced slots in opposite sides for receiving the forked end of a stake removal tool.
Claim 13
Dependent Claim
45 words
The scaffold claimed in claim 11 wherein said stake removal tool inclused an elongated bar having a bifurcated first end for engaging the slots in said safety stake, a foot pedal at the second end, and a raised fulcrum between said first and second ends.
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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) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |