Static structures (e.g. – buildings) – With adjunctive means for assembly or disassembly – Structure includes tool or opening to provide access for a...
Patent
1975-10-28
1977-08-02
Ridgill, Jr., James L.
Static structures (e.g., buildings)
With adjunctive means for assembly or disassembly
Structure includes tool or opening to provide access for a...
52118, 52632, 212144, E04H 1218, E04G 2504, B66C 2362
Patent
active
040387941
ABSTRACT:
An improved boom section has top and bottom walls formed of sloping plate sections or flanges which define peaks between the side walls. The peaked configuration of the bottom wall increases the buckling strength of the bottom wall over the bucking strength obtained with a flat bottom wall. The sloping flanges of the top and bottom walls are disposed at acute angles of between 12.degree. and 19.degree. to horizontal planes. If the slope of the flanges is increased to an angle significantly greater than 19.degree., the peaks in the top and bottom walls would be disposed relatively far from the central axis of the boom section and would be subjected to excessive stresses upon loading of the boom section. The boom section is advantageously formed with a height-to-width ratio which is greater than 1 and less than 3. Lateral stability of the boom section is promoted by having slider pad forces applied to the bottom wall of the boom section intersect at a point above the center of the boom section and having slider pad forces applied to the top wall of the boom section intersect at a point below the center of the boom section. To facilitate slider pad replacement, access openings are provided in the top walls of the boom sections. The slider pads advantageously move along stainless steel strips on the walls of the boom sections.
REFERENCES:
patent: 3481490 (1969-12-01), Eiler
Ridgill, Jr. James L.
The Warner & Swasey Company
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