PURPOSE: To raise the reliability of a loader at low cost by mechanically holding the attitude of working tool by a method in which the ascending action of a boom is fedback to the control valve of the working tool cylinder from the lifted up condition of working tool by a link mechanism.
CONSTITUTION: The second arm 22 to transmit the vertical action of a working tool 9 and the first arm 21 to be coupled with the arm 22 in relatively turnable manner when the tool 9 is upwardly turned to almost lift-up attitude B are pivotally supported on the midway of the boom 7. A rocking part 28 connected through the arm 21 and a link 29 to the pivotal shaft 6 of the boom 7 is also pivotally supported. The part 28 and the rocking piece 42 for the control valve 35 of working tool are connected with an interlocking part 52. With the rise of the boom 7, the arm 21 is coupled with the arm 22, the rocking part 28 is rocked through the link 29, and the control valve 35 for working is operated to hold the lift-up attitude B of the working tool 9.
NAKAO TADASHI
NOSAKA KENKICHI
| JPS5214521A | 1977-02-03 |