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Patent Searching and Data


Title:
ARM OF CONSTRUCTION MACHINERY
Document Type and Number:
Japanese Patent JP2005163375
Kind Code:
A
Abstract:

To provide an arm of construction machinery without requiring much labor for assembly in comparison with the conventional technique and without causing the lowering of strength like the conventional technique for a part on the front end side of the arm.

When the arm of the construction machinery equipped with: a first boss 1 wherein a bucket pivoting pin is inserted; and a second boss 2 having an inserted pin for pivoting the other end section of a link pivoted one end section on a bucket cylinder in a rotatable manner, is constituted on the front end side, an arm front end unit 5 equipped with: the boss sections 1 and 2 having thin tube sections 1b and 2b and thick pin supporting sections 1a and 2a supporting the pin connected to both ends of the tube sections 1b and 2b; and a side plate section 3 connecting between the pin supporting section 1a and the pin supporting section 2a, is so constituted that the pin supporting sections 1a and 2a, a connecting section Q with the tube sections 1b and 2b and a connecting section R of the pin supporting sections 1a and 2a to the side plate section 3 are integrally formed by casting using a cast steel so as to make a smooth cross section without causing stress concentration and that it is welded to an arm body 6.


Inventors:
RIYO AKINORI
TAHARA KOJI
TAMURA KAZUHISA
NAKAYAMA YOSHI
Application Number:
JP2003000403447
Publication Date:
June 23, 2005
Filing Date:
December 02, 2003
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E02F3/38; (IPC1-7): E02F3/38
Attorney, Agent or Firm:
武 顕次郎
鈴木 市郎
市村 裕宏
佐竹 一規