Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Trestle
Patent
1990-03-29
1991-04-30
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Trestle
182152, 182225, B27B 2100, B25H 106
Patent
active
050109782
ABSTRACT:
A method adapted to support a workpiece to be sawed, and a board supporting assembly which is used with the method. The assembly comprises: a front board supporting means for supporting a front board means, a rear board supporting means for supporting a rear board means, and a connecting board supporting means which is adapted to support a rear board means and which is connected pivotally at a front end thereof to the front board supporting means and at a rear end thereof to said rear board supporting means in a manner that the board supporting assembly reduces in size in a collapsed position and has certain dimensional relationships. The method comprises: providing the assembly; positioning the assembly in an operating position with the board means atop the board supporting means, with the board supporting assembly positioning upper portions of front, intermediate, and rear board means within a workpiece supporting plane; positioning the workpiece supporting assembly in a manner that a longitudinal displacement component exceeds 55% of the length of the workpiece; and positioning the workpiece upon the workpiece supporting plane for sawing, whereby the front and rear portions of the sawed workpiece remain supported.
REFERENCES:
patent: 293847 (1884-02-01), Bremer
patent: 386218 (1888-07-01), Phillips
patent: 3207260 (1965-09-01), Castagna
patent: 4031981 (1977-06-01), Spencer
patent: 4609071 (1986-09-01), Edward
patent: 4688658 (1987-08-01), Stoner
patent: 4819762 (1989-04-01), Osborne
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