초록 ▼

A hollow rectangular boom formed with four corner sections of identical cross section and plates interconnecting the corner sections is disclosed herein. Each of the corner sections is identical and is generally L-shaped in cross section with first and second legs each having a recess with adjacent

A hollow rectangular boom formed with four corner sections of identical cross section and plates interconnecting the corner sections is disclosed herein. Each of the corner sections is identical and is generally L-shaped in cross section with first and second legs each having a recess with adjacent pairs of corner sections being interconnected by flat plates received into the respective recesses and welded therein.

대표청구항 ▼

A boom construction for use as a crane boom for a vehicle comprising four corner sections of identical cross section, each of said sections being generally L-shaped in cross section with first and second legs extending substantially perpendicular to each other and having inner and outer surfaces, on

A boom construction for use as a crane boom for a vehicle comprising four corner sections of identical cross section, each of said sections being generally L-shaped in cross section with first and second legs extending substantially perpendicular to each other and having inner and outer surfaces, one of said legs having a first recess on said inner surface on the free enD thereof and the other of said legs having a second recess on said outer surface on the free end thereof, the outer surface of each corner section having flat portions extending perpendicular to each other at an outer peripheral corner of each corner section; a first pair of flat metal plates extending parallel to each other with opposite edges respectively received in the respective first recesses of the four corner sections and being permanently secured therein; and a second pair of flat metal plates extending parallel to each other and having opposite edges respectively received in the respective second recesses and being permanently secured therein to produce a hollow rectangular boom section, each of said spaced plates having their entire exposed surfaces spaced inwardly from adjacent flat portions of said corner sections, and reinforcing means between adjacent flat portions of a pair of corner members, said reinforcing means being secured to exposed surfaces of at least said first pair of flat metal plates and being spaced inwardly from the flat portions of said corner sections.