Tubular section boom
First Claim
1. A boom comprising:
- an elongated tubular body having first and second ends and a circular cross section throughout said body between said ends;
first connecting means secured to said body for connecting said boom to mounting means for supporting said boom; and
second connecting means secured to said body and located between the first and second ends thereof for connecting manipulating means for manipulating said boom, said tubular body including tapered portions extending longitudinally away from a maximum diameter in the vicinity of said second connecting means to lesser diameters of the first and second ends thereof; and
an elbow-shaped casting connected intermediate said tapered portions.
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Accused Products
Abstract
A boom for an excavator or the like is constructed to have a generally L-shape when viewed in side elevation and have a circular cross section tapering downward from a maximum diameter at the apex of the boom to each end. The boom is made up of a central body portion consisting of a cast-form elbow and a pair of tapered tubular members formed of rolled plate welded along a longitudinal seam extending from the elbow outward to the outer ends of the boom. A pair of cast-formed connecting members are then welded to the end of the boom. The method of fabrication includes the cast-forming of the elbow and the respective end connecting means and forming the tapered body members by rolling and connecting the entire assembly by welding.
28 Citations
10 Claims
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1. A boom comprising:
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an elongated tubular body having first and second ends and a circular cross section throughout said body between said ends; first connecting means secured to said body for connecting said boom to mounting means for supporting said boom; and second connecting means secured to said body and located between the first and second ends thereof for connecting manipulating means for manipulating said boom, said tubular body including tapered portions extending longitudinally away from a maximum diameter in the vicinity of said second connecting means to lesser diameters of the first and second ends thereof; and an elbow-shaped casting connected intermediate said tapered portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. The boom of claim 11 wherein said abutting edges are located below the horizontal axis.
Specification