Lift Arm of Skid Steer Loader

Abstract

The lift arm of a skid steer loader according to the present invention has a simple structure. A pair of left and right lift arms each has a first arm portion and a second arm portion. The first arm portion is made as an elongated member from components made from plate metal or the like, and its base end is rotatably fitted to a support portion which projects upwards at a rear portion of the main body of the loader. In this second arm portion, a connection portion, an attachment fitting portion, a horizontal load bearing portion, and an actuator fitting portion and so on are integrally formed as one member from cast metal. Furthermore, a hollow portion is formed in the interior of this second arm portion, extending from an approximately intermediate portion thereof to its base end.

1 . A lift arm of a skid steer loader, comprising:
 a first arm portion, a base end of which is rotatably supported at a rear portion of a loader main body, and the other end of which is formed so as to extend towards a front of said loader main body; and   a second arm portion, a base end of which is fixed to said other end of said first arm portion, and the other end of which is formed so as to extend downwards;   wherein, in said second arm portion:   a connection portion which is fitted to said other end of said first arm portion;   an attachment fitting portion which is provided at said other end, and to which a working attachment is rotatably fitted;   an actuator fitting portion which is provided at said base end, and to which an actuator for actuating said working attachment is fitted; and   a horizontal load bearing portion which is positioned between said attachment fitting portion and said actuator fitting portion, which is provided so as to project towards a side of said loader main body, and which is connected via a front member to a second arm portion on the opposite side of said loader main body;   are made as a single unit in an integrated manner from cast metal.   
   
   
       2 . The lift arm of a skid steering loader as described in  claim 1 , wherein, in said second arm portion a hollow portion is provided which extends from said connection portion to said horizontal load bearing portion.