JPS62186888U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の実施例にかかるブームの全体
側面図、第２図は同一部拡大側面図、第３図は第
２図―線、第４図は同―線にそれぞれ沿
う断面図である。 １……下部ブーム、２……中間ブーム、３……
上部ブーム、１１，２１，３１……主柱、１２，
２２，３２……斜材、ａ，ｂ，ｃ……各単位ブー
ムの主柱径。 Figure 1 is an overall side view of a boom according to an embodiment of the present invention, Figure 2 is an enlarged side view of the same part, Figure 3 is a sectional view taken along the line in Figure 2, and Figure 4 is a sectional view taken along the line in Figure 2. be. 1...lower boom, 2...middle boom, 3...
Upper boom, 11, 21, 31...Main pillar, 12,
22, 32... Diagonal members, a, b, c... Main column diameter of each unit boom.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 下部ブーム、一乃至複数の中間ブーム、上部ブ
ームの各単位ブームが隣り合うもの同士連結され
て構成され、各単位ブームはそれぞれ四本のパイ
プ製主柱間に多数の斜材が取付けられてラチス構
造に構成されるクレーンブームにおいて、上記各
単位ブームを構成する主柱の断面積が、上記下部
ブームの主柱断面積を最大として上部ブーム側に
向かつて漸次小さく形成されてなることを特徴と
するクレーンブーム。 Each unit boom, including a lower boom, one or more intermediate booms, and an upper boom, are connected to each other, and each unit boom has a lattice structure with a number of diagonal members attached between four main pipe columns. The crane boom is characterized in that the cross-sectional area of the main pillars constituting each of the unit booms is formed such that the cross-sectional area of the main pillar of the lower boom is the maximum and gradually decreases toward the upper boom side. crane boom.