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1. (US4775288) High-lift loader
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The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A mobile high-lift loader comprising:
a frame assembly including a wheel-mounted main frame and a boom support frame;
said boom support frame having a first end and a second end;
means pivotally connecting the first end of the boom support frame to the main frame for pivotal movement about a first horizontal axis in a first direction to move the second end of the boom support frame from a lowered position adjacent the main frame to an elevated position, and in a second direction opposite to the first direction to move the second end from the elevated position back to a lowered position;
an elongate boom having a butt end and a tip;
means pivotally connecting the butt end of the boom to the second end of the boom support frame for pivotal movement about a second horizontal axis in a first direction to move the boom tip from a lowered position adjacent the boom support frame to an elevated position; and in a second direction opposite the first direction to move the boom tip from the elevated position to the lowered position;
power means for movement of the boom support frame and for movement of the boom;
a load-handling member fixed proximate the boom tip;
a master-slave hydraulic motor assembly to maintain positional relationship of the load-handling member on the boom tip during rotation of the boom support frame and the boom, said assembly including a support frame slave hydraulic motor connected between the support frame and the main frame, a link member having first and second ends pivotally connected at the pivot juncture between the support frame and the boom, a link hydraulic motor connected between the support frame and the first end of the link member, a boom slave hydraulic motor connected between the second end of the link member and the boom, a load-handling member tilt motor connected between the load-handlng member and the boom tip, hydraulic line means interconnecting the hydraulic motors whereby the load-handling member tilt motor acts responsively to movement of the support frame and movement of the boom, said hydraulic motors being constituted as the cylinder-rod type.
2. A load-lifting assembly connectable to vertically stationary structure and having means to maintain positional relationship of a load-handling member, comprising:
a support platform having a first end and a second end;
first pivot means pivotally connecting the first end of the support platform to vertically fixed structure for pivotal movement about a first horizontal axis between a first position with the second end lowered and a second position with the second end elevated;
first power means to move the support platform between its first and second positions;
an elongate boom having a first end and a second end;
second pivot means pivotally connecting the first end of the boom to the second end of the support platform for pivotal movement about a second horizontal axis between a first lower position proximate the support platform and a second elevated position with respect to the support platform;
second power means to move the boom between its first and second positions;
a load-handling member pivotally connected to the econd end of the boom;
a hydraulic motor assembly to maintain positional relationship of the load-handling member during rotation of the support platform and rotation of the boom, including first, second, third and fourth hydraulic motors of the type having a cylinder and a rod extendible and retractable with respect to the cylinder, and a link member pivotally connected between the support platform and the boom at the second pivot means for coaxial rotation therewith and having first and second ends extended opposite directions from the second pivot means;
said first hydraulic motor connected between the vertically fixed structure and the first end of the support platform;
said second hydraulic motor connected between the second end of the support platform and the first end of the link member;
said third hydraulic motor connected between the second end of the link member and the first end of the boom;
said fourth hydraulic motor connected between the second end of the boom and the load-handling member;
hydraulic line means interconnecting the first and second and third and fourth hydraulic motors whereby the fourth hydraulic motor follows movement of the first hydraulic motor responsive to rotation of the support platform, and follows movement of the third hydraulic motor responsive to rotation of the boom.
3. The load-lifting assemhly of claim 2 wherein: said load-handling member is comprised as a forklift assembly.
4. The load-lifting assembly of claim 3 wherein: said first and second power means are comprised as hydraulic power units.