Fire escape – ladder – or scaffold – Platform
Patent
1997-12-15
1999-02-02
Chin-Shue, Alvin
Fire escape, ladder, or scaffold
Platform
1821791, 527262, E04G 500
Patent
active
058652710
ABSTRACT:
A telescopic ledger for scaffolding comprises an elongated ledger member of substantially uniform I-shape in cross section along its length, a front coupling sleeve attached to the ledger member adjacent its front end, and a channel assembly having a pair of elongated channel members and a rear coupling sleeve attached to the channel members proximate to their rear ends. The channel members are of the same substantially uniform U-shaped cross section along their lengths, each channel member having a web portion and side flange portions joined to and extending from side edges of the web portion. The channel members are joined to each other by the rear coupling sleeve in spaced-apart relation with their web portions in opposed relation and defining a cavity and with the side flange portions defining a gap. A portion of the ledger member adjacent to the front end is received in telescopic relation to portions of the channel members adjacent the rear ends of the channel members. The front coupling sleeve and the channel members are in close sliding relation for transfer of loads from the channel members to the first coupling sleeve. The rear coupling sleeve and the ledger member are, similarly, in close sliding relation for transfer of loads from the ledger member to the rear coupling sleeve.
REFERENCES:
patent: 444579 (1891-01-01), Jackson
patent: 1415554 (1922-05-01), Hatch
patent: 3108663 (1963-10-01), Glaser
patent: 3247639 (1966-04-01), Rambelje
Chin-Shue Alvin
Universal Builders Supply, Inc.
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