US4262774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable scaffold
Assignee: Individual
•
Filing: 1979-11-26
•
Granted: 1981-04-21
•
Expires: 1999-11-26
Abstract
Abstract A scaffold construction includes a fixed leg portion and an adjustable platform portion with a spring loaded pin connection operatively connecting between the two to selectively lock the leg and the platform in the required relationship. The pin is mounted on one end of a leaf spring which in turn is secured to the platform and engages any one of a plurality of apertures in the leg portion. A gravity operated locking device normally prevents inadvertent disengagement of the pin from the leg unless it is moved upwardly manually thus preventing accidental and inadvertent collapse of the platform relative to the leg.
Inventors
- 👤 Roman Chez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:27
CPC Classifications
E; E04; E04G; E04G7/00; E04G7/30; E04G7/301; E04G1/00; E04G1/18; E04G1/20; E04G7/302; E04G7/303; E04G7/305
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
Adjustable scaffolding which includes vertically extending supporting legs, a platform extending therebetween, and means operatively connecting and supporting the platform to the legs for selective vertical movement therealong; releasable latch means operatively connected between each of said legs in said platform, said releasable latch means including a spring loaded latch pin on said platform selectively engageable with any one of a plurality of latch pin engaging means on said legs and means to selectively lock said latch pin in the closed position, said spring loaded latch pin including a leaf spring secured by one end thereof to said platform, a latch pin extending therefrom, said leaf spring normally urging said latch pin towards the leg engaging position, and means to move said latch pin away from said leg engaging position against pressure of said leaf spring, said means to selectively lock said latch pin including a locking member mounted for vertical sliding movement to said platform above said leaf spring and adjacent the upper end thereof and means on said locking member automatically engaging over said other end of said leaf spring when said latch pin is in the closed position.
Claim 2
Dependent Claim
191 words
Adjustable scaffolding which includes vertically extending supporting legs, a platform extending therebetween, and means operatively connecting and supporting the platform to the legs for selective vertical movement therealong; releasable latch means operatively connected between each of said legs in said platform, said releasable latch means including a spring loaded latch pin on said platform selectively engageable with any one of a plurality of latch pin engaging means on said legs and means to selectively lock said latch pin in the closed position, said spring loaded latch pin including a leaf spring secured by one end thereof to said platform, a latch pin extending therefrom, said leaf spring normally urging said latch pin towards the leg engaging position, and means to move said latch pin away from said leg engaging position against pressure of said leaf spring, said means to selectively lock said latch pin including a locking member mounted for vertical sliding movement to said platform above said leaf spring and adjacent the upper end thereof and means on said locking member automatically engaging over said other end of said leaf spring when said latch pin is in the closed position.
Claim 3
Dependent Claim
31 words
The releasable latch means according to claim 1 in which said platform includes a leg engaging portion, said leg engaging portion being apertured, said latch pin extending freely through said aperture.
Claim 4
Dependent Claim
61 words
The releasable latch means according to claim 1 in which said latch pin extends perpendicular to said leaf spring from one side thereof and adjacent the other end thereof, said means to move said latch pin away from said leg engaging position including a hand engaging portion secured to said leaf spring on the side thereof opposite to said latch pin.
Claim 5
Dependent Claim
61 words
The releasable latch means according to claim 2 in which said latch pin extends perpendicular to said leaf spring from one side thereof and adjacent the other end thereof, said means to move said latch pin away from said leg engaging position including a hand engaging portion secured to said leaf spring on the side thereof opposite to said latch pin.
Claim 6
Dependent Claim
27 words
The releasable latch means according to claims 1, 2 or 3 in which said locking member engages over said other end of said leaf spring by gravity.
Claim 7
Dependent Claim
24 words
The releasable latch means according to claim 4 in which said locking member engages over said other end of said leaf spring by gravity.
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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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |