Fire escape – ladder – or scaffold – Ladder with vertically moving platform or escape – Ladder supports platform
Reexamination Certificate
2004-09-02
2008-09-16
Chin-Shue, Alvin C (Department: 3634)
Fire escape, ladder, or scaffold
Ladder with vertically moving platform or escape
Ladder supports platform
C182S129000
Reexamination Certificate
active
07424932
ABSTRACT:
A hoisting device and method for hoisting material up an extension ladder. The device includes a load-carrying carriage having a wheel and roller axle assembly that also serves as rollers for engagement with the rails of the ladder. The wheel and roller axle assembly allows the cart to transition from the ladder rails to the roof surface. Also provided is a dual braking means that serves to prevent the carriage from rolling back down the ladder or off of the roof in cases of cable malfunction. The method employs a hoisting mechanism having a removable winch used in conjunction with a releasable coupled pull cable that is brought to the roof surface on the carriage, detached from the carriage, mounted on the roof and used to return the carriage to and from the roof during hoisting operations. An infinitely adjustable ladder support is provided to support the ladder during a hoist.
REFERENCES:
patent: 651665 (1900-06-01), Johns
patent: 976240 (1910-11-01), Winkler
patent: 2714434 (1955-08-01), Peterson
patent: 2942693 (1960-06-01), Johnson
patent: 3115211 (1963-12-01), Ostrander, Jr.
patent: 3666054 (1972-05-01), Ellings et al.
patent: 3799289 (1974-03-01), Cecere, Jr.
patent: 4183423 (1980-01-01), Lewis
patent: D260754 (1981-09-01), Gunnels
patent: 4546853 (1985-10-01), Hanson
patent: 4550806 (1985-11-01), Bocker
patent: 5275256 (1994-01-01), Ellzey
patent: 5320194 (1994-06-01), Bredijk
patent: 5544718 (1996-08-01), Schummacher
patent: 5595410 (1997-01-01), Wilson et al.
patent: 5911287 (1999-06-01), Campbell
patent: 6244381 (2001-06-01), Ruble
patent: 6912938 (2005-07-01), Kurtz
patent: 2003/0230451 (2003-12-01), Garrett
Grand Rental Station, website, http://rental.trusite.com/rental, 2003, Richmond, VA.
Bishop Ladder Company, website, http://bishopladder.com/hoists, Hartford, CT.
Marathon Roofing Products, catalog, LPH Ladder Platform Hoists, Buffalo, NY.
Roofing Contractor, Magazine—advertisement, Oct. 2003, p. 76.
Clairco, website, http://www.equip-mathieu, com, Quebec, Canada.
Chin-Shue Alvin C
Stagg William W.
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