Fire escape – ladder – or scaffold – Convertible
Reexamination Certificate
1997-09-17
2001-04-03
Shue, Alvin Chin (Department: 3634)
Fire escape, ladder, or scaffold
Convertible
C182S127000
Reexamination Certificate
active
06209681
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to a wheel device or caddy which supports a ladder and enables one individual to move the ladder, especially where the ladder is a heavy and long ladder such as an extension ladder.
2. Description of the Prior Art
U.S. Pat. No. 4,564,203, issued on Jan. 14, 1986, shows a single small wheel pivotally mounted on one end of a step ladder.
U.S. Pat. No. 4,049,283, issued on Sep. 20, 1977, (based upon U.S. Pat. No. 3,991,852, issued Nov. 16, 1976) shows a ladder caddy which has a support using one pair of upright legs and a pair of small wheels.
U.S. Pat. No. 3,596,922, issued on Aug. 3, 1971, shows a utility cart with a single small wheel.
U.S. Pat. Nos. 3,074,507, issued Jan. 22, 1963, 4,009,762, issued Mar. 1, 1977, and 5,086,872, issued Feb. 11, 1992, each show multiple small wheel devices for supporting ladders.
SUMMARY OF THE INVENTION
The present invention comprises a dolly for supporting a ladder during movement of the ladder to a work site. The dolly has a frame which is adapted to be attached by clips to the rungs of the ladder. The dolly has a single comparatively large wheel in terms of the width of a ladder to be mounted on the frame of the dolly for providing a rolling support to the ladder and to enable a single individual to move a long heavy ladder conveniently into position for use at a work site. The dolly is especially useful when moving a ladder, especially a heavy ladder, over sloping or rough ground.
Thus an object of the invention is to provide a single wheel dolly or a rolling support for a ladder to enable the ladder, especially a heavy ladder, to be moved conveniently from one location to another, such as to a work site.
It is another object of the invention to provide a single wheel dolly for rollingly supporting a ladder during movement thereof by one individual.
REFERENCES:
patent: 2416492 (1947-02-01), Negley
patent: 2606771 (1952-08-01), Rehngerg
patent: 2624588 (1953-01-01), Jones
patent: 2746628 (1956-05-01), Neyra
patent: 3387859 (1968-06-01), McClellan
patent: 3567241 (1971-03-01), Foschino
patent: 4049283 (1977-09-01), Brooks
patent: 4288087 (1981-09-01), Morrison
patent: 4579357 (1986-04-01), Webster
patent: 5368325 (1994-11-01), Hazen
patent: 382419 (1908-02-01), None
patent: 615227 (1926-12-01), None
Chin Shue Alvin
McQuillan John Q.
Peter DiSario-RPM Painting
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