Patent ID: 9327948
Filing Date: 2016-05-03
CPC Classification: B66C

Claim Text:
1. A telescopic boom comprising: a boom body provided in a working vehicle and in which a plurality of boom members including a top boom member are telescopically inserted and are formed to be moved telescopically in a longitudinal direction; a telescopic cylinder that is positioned in the top boom member at a completely contracted time of the boom body and extends/contracts the boom body; and at least a roller that is provided at a tip end portion of the telescopic cylinder and disposed to roll in the longitudinal direction, wherein the roller has an outer peripheral surface formed to be curved in a convex shape outside along an axis of the roller perpendicular to the longitudinal direction and including an intermediate portion which is in contact with a lower plate of the boom body and both end portions which are provided on both sides of the intermediate portion and are away from the lower plate.