JPH0457542U - - Google Patents

Description

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

第１図はこの考案にかかるブームを示す側面図
、第２図は第１図のＢより見た平面図、第３図は
第１図のＣ−Ｃ断面図、第４図は第１図のＤ−Ｄ
断面図、第５図はこの考案のブームの組立構成を
示す分解側面図、第６図は従来技術のブームを示
す側面図、第７図は第６図のＡ―Ａ断面図、第８
図は従来技術のブームの組立構成を示す分解側面
図である。 １，８……ブーム、２，９……前側ブロツク、
４，１１……後側ブロツク、６，１３……ブーム
シリンダブラケツト、７，１４……アームシリン
ダブラケツト、１５〜１８……上下側面板、１９
……後端縁、２０……前端縁。 Fig. 1 is a side view showing the boom according to this invention, Fig. 2 is a plan view seen from B in Fig. 1, Fig. 3 is a cross-sectional view taken along line C-C in Fig. 1, and Fig. 4 is a view from Fig. 1. D-D of
5 is an exploded side view showing the assembled configuration of the boom of this invention, FIG. 6 is a side view showing the boom of the prior art, FIG. 7 is a sectional view taken along line AA in FIG.
The figure is an exploded side view showing the assembled configuration of a conventional boom. 1, 8... Boom, 2, 9... Front block,
4, 11... Rear block, 6, 13... Boom cylinder bracket, 7, 14... Arm cylinder bracket, 15-18... Upper and lower side plates, 19
...Rear end edge, 20... Front end edge.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 筒形の前側ブロツクの後端部と後側ブロツクの
前端部とを突合わせ溶着してく字形に形成してい
るブームにおいて、前側ブロツクと後側ブロツク
のそれぞれ上下側面板を左右対称の断面コ字形の
左上下側面板と右上下側面板に分割し、その左右
の上下側面板をともに突合わせ溶着して筒形の前
側ブロツクと後側ブロツクに形成するとともに、
その前側ブロツクの後端縁と後側ブロツクの前端
縁がともに前後方向中心線と直角方向の一平面上
にあるように形成し、上記前側ブロツクの後端縁
と後側ブロツクの前端縁とを突合わせ溶着してく
字形に形成したことを特徴とするブームの構造。 In a boom in which the rear end of the cylindrical front block and the front end of the rear block are butt-welded to form a dogleg shape, the top and bottom side plates of the front and rear blocks are each shaped like a U-shape in cross section. It is divided into upper and lower left side plates and upper and lower right side plates, and the left and right upper and lower side plates are butt-welded together to form a cylindrical front block and a rear block.
The rear end edge of the front block and the front end edge of the rear block are both formed on one plane in the direction perpendicular to the longitudinal center line, and the rear end edge of the front block and the front end edge of the rear block are A boom structure characterized by butt welding and forming a dogleg shape.