Fire escape – ladder – or scaffold – Scaffold external of shaft
Patent
1992-04-20
1992-10-20
Johnson, Blair M.
Fire escape, ladder, or scaffold
Scaffold external of shaft
182135, A47C 910
Patent
active
051562367
ABSTRACT:
Apparatus for climbing a tree has two frames, each frame having a rigid base portion with a flexible adjustable tree encircling band mounted thereon. A turnbuckle is connected to ends of each band for drawing together and separating the ends so as to change the effective length of the band. The rigid base portions of each frame have tree gripping edges which together with the bands and resiliently biased braces acts to secure each frame to the tree. Adjustment of the turnbuckles changes the attitude of the base relative to the ground. One of the frames is positioned above the other on the tree and they are alternatively raised up the tree or lowered down the tree. The upper frame includes a seat which hangs from the rigid base and is slidable, vertically adjustable and pivotable relative to the base. The lower frame has a platform upon which the feet of a user may rest while standing or seated on the seat. A pivotable brace member mounted on each base and resiliently urged against the tree acts to aid in holding each frame against the tree during the climbing phase and the upper brace member also functions as a backrest for the user.
REFERENCES:
patent: 4120379 (1978-10-01), Carter
patent: 4331216 (1982-05-01), Amacker
patent: 4417645 (1983-11-01), Untz
patent: 4428459 (1984-01-01), Peck
patent: 4802552 (1989-02-01), Williams
patent: 4909353 (1990-03-01), Govin et al.
patent: 4936416 (1990-06-01), Garon
patent: 5101934 (1992-04-01), Zambro
Johnson Blair M.
Ruderman Alan
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