Boom assembly

A lift device, comprising:

• a chassis;
• a plurality of tractive elements coupled to the chassis;
• and
• a boom configured to couple an implement to the chassis, the boom comprising:
• a first boom section comprising:
• a first shell including a first sidewall and a first set of flanges coupled to the first sidewall, the first set of flanges comprising:
• a first flange;
• and
• a second flange;
• and
• a second shell including a second sidewall and a second set of flanges coupled to the second sidewall, the second set of flanges comprising:
• a third flange abutting the first flange along a first contact plane;
• and
• a fourth flange abutting the second flange,
• a second boom section moveable relative to the first boom section, the second boom section comprising:
• a third shell including a third sidewall and a fifth flange coupled to the third sidewall;
• and
• a fourth shell including a fourth sidewall and a sixth flange coupled to the fourth sidewall and abutting the fifth flange along a second contact plane,
• wherein the first shell is coupled to the second shell such that the first sidewall and the second sidewall at least partially define an enclosed volume, wherein the first set of flanges and the second set of flanges at least partially define a channel, wherein the first set of flanges and the second set of flanges extend away from the enclosed volume, and wherein the first contact plane is offset from the second contact plane.

A lift device, comprising:

• a chassis;
• a plurality of tractive elements coupled to the chassis;
• and
• a boom configured to couple an implement to the chassis, the boom comprising:
• a first boom section comprising:
• a first shell including a first sidewall and a first flange coupled to the first sidewall;
• and
• a second shell including a second sidewall and a second flange coupled to the second sidewall and abutting the first flange;
• and
• a second boom section moveable relative to the first boom section, the second boom section comprising:
• a third shell including a third sidewall and a third flange coupled to the third sidewall;
• and
• a fourth shell including a fourth sidewall and a fourth flange coupled to the fourth sidewall and abutting the third flange,
• wherein the first sidewall and the second sidewall at least partially define a first enclosed volume that receives the second boom section, wherein the third sidewall and the fourth sidewall at least partially define a second enclosed volume, wherein the first flange and the second flange extend into the first enclosed volume, and wherein the third flange and the fourth flange extend away from the second enclosed volume.