Fire escape – ladder – or scaffold – Platform with elevating or lowering means – Suspended
Patent
1989-03-17
1991-01-29
Chotkowski, Karen J.
Fire escape, ladder, or scaffold
Platform with elevating or lowering means
Suspended
182150, A01M 3102, A45F 326
Patent
active
049879715
ABSTRACT:
A hanging cradle arrangement (1) of the kind which comprises a working platform (2), a post or arm (3) which extends upwardly from the platform and which is intended to work with a line (4, 4a, 4b), a first attachment (5) or pulley located above the working platform (2); a guide (6) or pulley located on the free part (3a) of the post (3); normally a second attachment (7) located beneath said guide (6); and device (8) for raising and lowering the working platform by changing the distance between the guide (6) and the first attachment (5) with the aid of a line activating machine (8). According to the invention the arrangement is such that the distance (H) between the platform (2) and the upper free part (3a) of the post can be decreased when the upper free part (6) is in co-action with the first attachment (5), and in that the possibility is provided of further raising the working platform.
The post (3) has the form of a rod or a tube which is torsionally rigid in relation to the platform and which is mounted for axial movement in at least two journal devices (11, 12) which are stationary in relation to the working platform (2).
Arranged between the rod (3) and the platform (2) or some other fixed part, is a spring device (14) which holds the rod (3) in a position directed away from the platform (2) and which is compressed when the rod (3) is urged downwords by an externally applied force, the rod again taking an upwardly extending position when the external force is removed.
REFERENCES:
patent: 2662734 (1953-12-01), Allenbaugh
patent: 2998094 (1961-08-01), Fisher
patent: 3464520 (1969-09-01), Anderson
patent: 3630315 (1971-12-01), Meyer
patent: 4225012 (1980-09-01), Hindle
patent: 4602698 (1986-07-01), Grant
patent: 4650036 (1987-03-01), Matsuda
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