Title:
BOOM FOR WORK MACHINE
Document Type and Number:
Japanese Patent JP2017081659
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a boom for a work machine, which enables reduction in thickness of a steel plate forming a boom member, while preventing buckling of the boom member.SOLUTION: A boom member 41 is made up of a bent plate-like member and has a cross-sectional shape including protruding portions 50 each protruding inward of an outer peripheral portion. The protruding portion 50 has a pair of flat side-wall portions 51 each extending inward from the outer peripheral portion of the boom member 41, through a first bending portion 53. The flat side-wall portion 51 extends being bent inward at an angle within the range of 30 to 120 degrees relative to the outer peripheral portion of the boom member 41. This structure increases rigidity of the boom member 41 and improves strength against buckling, thus enabling reduction in thickness of the steel plate forming the boom member 41, and reduction in weight of the boom member 41.SELECTED DRAWING: Figure 3
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Inventors:
MIYAJIMA TOSHIYUKI
Application Number:
JP2015208678A
Publication Date:
May 18, 2017
Filing Date:
October 23, 2015
Export Citation:
Assignee:
TADANO LTD
International Classes:
B66C23/693
Attorney, Agent or Firm:
Ebisu International Patent Office