Fire escape – ladder – or scaffold – Wall- or floor-attached
Patent
1988-07-15
1990-07-24
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Wall- or floor-attached
182146, 182229, 248235, E04G 120, E04G 504
Patent
active
049429400
ABSTRACT:
A scaffold jack includes a jack housing mounted for slidable movement on a vertical post. The jack housing has a support beam projecting horizontally therefrom upon which a working platform is supported above the ground. A ratchet mechanism on the housing includes a pawl which will cooperate with apertures in the vertical post to allow upward movement of the jack housing and support the housing above the ground. A winch is mounted to the jack housing and has a hook and cable connected thereto which may be connected to a bracket journaled in an aperture at the upper end of the post, such that the jack housing may be winched upwardly. A pair of horizontally oriented rigid legs are provided which are connectable to the post and to an adjacent vertical wall structure, such that the post may be stabilized in a vertical orientation.
REFERENCES:
patent: 295578 (1884-03-01), O'Brien
patent: 459247 (1891-09-01), Biddall
patent: 795196 (1905-07-01), Conover
patent: 1127369 (1915-02-01), Nash
patent: 3146855 (1964-09-01), Aberegg
patent: 3438460 (1969-04-01), Solari
patent: 3473774 (1969-10-01), Riblet
patent: 4078633 (1978-03-01), Fahy
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