Industrial truck

Claim 2

In an Industrial truck having a guide means, a load support means, a pair of connecting means each of which is hinged on one side to said load support means and on the other side to a corresponding one of a pair of members, each member being slidably engaged with said guide means, and a first and second actuator arranged on said guide means each connected to one of said pair of members for individual or simultaneous sliding of said members; the improvement in which one of said connecting means is a knee joint having a pair of links hinged to each other, one of which is provided with a third actuator to control the posture thereof, and the other of said connecting means is a link arm.

Claim 3

An industrial truck in accordance with claim 1 wherein said knee joint is operable only when the one of said slidable members hinged to said knee joint is shifted at one end position of said guide means.

Claim 4

An industrial truck in accordance with claim 2 wherein said guide means is provided with a fourth actuator which is able to swing said link arm only when said slidable member hinged to said link arm is positioned at an extreme end on said guide means.

Claim 5

An improvement as claimed in claim 3 wherein a latch means is provided to connect temporarily said load support means to said link arm.

Claim 6

An improvement as claimed in claim 4 wherein said fourth actuator for pushing said link arm is mounted on said slidable member hinged to said link arm to fulfill another function of releasing said latch means.

Claim 7

An industrial truck in accordance with claim 2 wherein there are provided a first and a second valve means, both of which have available at least two positions and wherein when said first valve means takes one position said second valve means permits the actuation of said second actuator to slide said link arm and said third actuator to bend said knee joint when said second valve is at a first position where said slidable member hinged to said knee joint is positioned at one extreme end position on said guide means, and said second valve means permits the actuation of said first actuator to slide said knee joint and said fourth actuator to swing said link arm when said second valve means is in a second position where said slidable member hinged to said link arm is located at the other extreme end portion on said guide means.

Claim 8

An improvement as claimed in claim 6 wherein each of said first and second actuators is a double acting hydraulic cylinder.

Claim 9

An improvement as claimed in claim 7 wherein a single lever is provided to control simultaneous parallel movement of said pair of hydraulic actuators or independent motion of one of said hydraulic actuators and at the same time a movement for one of said other two actuators.

Claim 10

An industrial truck in accordance with claim 1 wherein there are provided a first and a second valve means, both of which have available at least two positions and wherein when said first valve means takes one position said second valve means permits the actuation of said second actuator to slide said link arm and said third actuator to bend said knee joint when said second valve is at a first position where said slidable member hinged to said knee joint is positioned at one extreme end position on said guide means, and said second valve means permits the actuation of said first actuator to slide said knee joint when said second valve means is in a second position where said slidable member hinged to said link arm is located at the other extreme end position on said guide means.