Scissor frame lift apparatus for dump trucks

In combination,

• a truck having a frame including a pair of horizontally spaced apart and longitudinally extending frame members,
• a dump body hingedly mounted upon the frame of the truck including a pair of longitudinally extending runsills supporting the understructure of the dump body spaced to lie over the frame members of the truck,
• and a scissor frame lift for raising and lowering said dump body relative to said truck frame,
• said scissor frame lift comprising a lower frame assembly including a horizontally disposed lower mount cross tube means having opposite ends operatively rotatably secured to mounts on the frame members, a pair of lower frame members secured to said lower mount cross tube means extending rearwardly and inwardly therefrom, a drop hinge leg secured to the rearward end of each of said lower frame members, a hinge shaft secured to and extending between said drop hinge legs;
• an upper frame assembly including an upper mount cross tube means having opposite ends operatively rotatably secured to mounts on the runsills, a pair of upper frame members secured to said upper mount cross tube means and extending rearwardly and inwardly therefrom, a hinge leg secured to the rearward end of each of said upper frame members, said hinge legs being rotatably mounted on said hinge shaft;
• a cross head shaft secured to and extending between said upper frame members forwardly of said hinge shaft, a cross head rotatably mounted on said cross head shaft;
• a hydraulic cylinder means including a cylinder portion and a rod portion;
• means connecting said rod portion to said cross head;
• and means operatively rotatably connecting said cylinder portion, about a horizontal axis, to said lower frame members adjacent the forward ends thereof;
• the distance between said hinge legs being substantially less than the distance between the forward ends of said upper frame members and substantially less than the distance between the forward ends of said lower frame members;
• each of said lower frame members being channel-shaped and including a vertically disposed web having upper and lower ends, a top flange extending outwardly from the upper end of said web, and a bottom flange extending outwardly from the lower end of said web;
• each of said upper frame members being channel-shaped and having a vertically disposed web with upper and lower ends, a top flange extending inwardly from the upper end of said web, and a bottom flange extending inwardly from the lower end of said web;
• the width of the top and bottom flanges of said lower frame members increasing from the forward to rearward ends thereof.

In combination,

• a truck having a frame including a pair of horizontally spaced apart and longitudinally extending frame members,
• a dump body hingedly mounted upon the frame of the truck including a pair of longitudinally extending runsills supporting the understructure of the dump body spaced to lie over the frame members of the truck,
• and a scissor frame lift for raising and lowering said dump body relative to said truck frame,
• said scissor frame lift comprising a lower frame assembly including a horizontally disposed lower mount cross tube means having opposite ends operatively rotatably secured to mounts on the frame members, a pair of lower frame members secured to said lower mount cross tube means and extending rearwardly and inwardly therefrom, a drop hinge leg secured to the rearward end of each of said lower frame members, a hinge shaft secured to and extending between said drop hinge legs;
• an upper frame assembly including an upper mount cross tube means having opposite ends operatively rotatably secured to mounts on the runsills, a pair of upper frame members secured to said upper mount cross tube means and extending rearwardly and inwardly therefrom, a hinge leg secured to the rearward end of each of said upper frame members, said hinge legs being rotatably mounted on said hinge shaft;
• a cross head shaft secured to and extending between said upper frame members forwardly of said hinge shaft, a cross head rotatably mounted on said cross head shaft;
• a hydraulic cylinder means including a cylinder portion and a rod portion;
• means connecting said rod portion to said cross head;
• and means operatively rotatably connecting said cylinder portion, about a horizontal axis, to said lower frame members adjacent the forward ends thereof;
• one end of an elongated body prop being pivotally mounted on one end of said lower mount cross tube of said lower frame assembly, said body prop being selectively movable between operative and inoperative positions, said body prop being substantially horizontally disposed when in its said inoperative position, the other end of said body prop adapted to engage and limit the downward movement of said upper frame assembly when in its said operative position.

In combination,

• a truck having a frame including a pair of horizontally spaced apart and longitudinally extending frame members,
• a dump body hingedly mounted upon the frame of the truck including a pair of longitudinally extending runsills supporting the understructure of the dump body spaced to lie over the frame members of the truck,
• and a scissor frame lift for raising and lowering said dump body relative to said truck frame,
• said scissor frame lift comprising a lower frame assembly including a horizontally disposed lower mount cross tube means having opposite ends operatively rotatably secured to mounts on the frame members, a pair of lower frame members secured to said lower mount cross tube means and extending rearwardly and inwardly therefrom, a drop hinge leg secured to the rearward end of each of said lower frame members, a hinge shaft secured to and extending between said drop hinge legs;
• an upper frame assembly including an upper mount cross tube means having opposite ends operatively rotatably secured to mounts on the runsills, a pair of upper frame members secured to said upper mount cross tube means and extending rearwardly and inwardly therefrom, a hinge leg secured to the rearward end of each of said upper frame members, said hinge legs being rotatably mounted on said hinge shaft;
• a cross head shaft secured to and extending between said upper frame members forwardly of said hinge shaft, a cross head rotatably mounted on said cross head shaft;
• a hydraulic cylinder means including a cylinder portion and a rod portion;
• means connecting said rod portion to said cross head;
• and means operatively rotatably connecting said cylinder portion, about a horizontal axis, to said lower frame members adjacent the forward ends thereof;
• the distance between said hinge legs being substantially less than the distance between the forward ends of said upper frame members and substantially less than the distance between the forward ends of said lower frame members.

The combination of a truck having a frame including a pair of horizontally spaced apart and longitudinally extending frame members having a dump body hingedly mounted on the frame of the truck, said dump body including a pair of longitudinally extending runsills supporting the understructure of the dump body spaced to lie over the frame members of the truck, comprising,

• a scissor frame lift for raising and lowering said dump body relative to said truck frame, said scissor frame lift comprising a lower frame assembly including a horizontally disposed lower mount cross tube means having opposite ends operatively rotatably secured to mounts on the frame members, a pair of lower frame members secured to said lower mount cross tube means and extending rearwardly and inwardly therefrom, a drop hinge leg secured to the rearward end of each of said lower frame members, a hinge shaft secured to and extending between said drop hinge legs;
• an upper frame assembly including an upper mount cross tube means having opposite ends operatively rotatably secured to mounts on the runsills, a pair of upper frame members secured to said upper mount cross tube means and extending rearwardly and inwardly therefrom, a hinge leg secured to the rearward end of each of said upper frame members, said hinge legs being rotatably mounted on said hinge shaft;
• a cross head shaft secured to and extending between said upper frame members forwardly of said hinge shaft, a cross head rotatably mounted on said cross head shaft;
• a hydraulic cylinder means including a cylinder portion and a rod portion;
• means connecting said rod portion to said cross head;
• and means operatively rotatably connecting said cylinder portion, about a horizontal axis, to said lower frame members adjacent the forward ends thereof;
• the distance between said hinge legs being less than the distance between the forward ends of said upper frame members and substantially less than the distance between the forward ends of said lower frame members.

The combination of a truck having a frame including a pair of horizontally spaced apart and longitudinally extending frame members having a dump body hingedly mounted on the frame of the truck, said dump body including a pair of longitudinally extending runsills supporting the understructure of the dump body spaced to lie over the frame members of the truck, comprising,

• a scissor frame lift for raising and lowering said dump body relative to said truck frame, said scissor frame lift comprising a lower frame assembly including a horizontally disposed lower mount cross tube means having opposite ends operatively rotatably secured to mounts on the frame members, a pair of lower frame members secured to said lower mount cross tube means, each of said lower frame members including top and bottom flanges having a web extending therebetween, said webs of said lower frame members extending rearwardly and inwardly from said lower mount cross tube means, said lower frame members being arranged in a non-parallel fashion with respect to each other, a drop hinge leg secured to the rearward end of each of said lower frame members, a hinge shaft secured to and extending between said drop hinge legs;
• an upper frame assembly including an upper mount cross tube means having opposite ends operatively rotatably secured to mounts on the runsills, a pair of upper frame members secured to said upper mount cross tube means, each of said upper frame members including top and bottom flanges having a web extending therebetween, said webs of said upper frame members extending rearwardly and inwardly from said upper mount cross tube means, said upper frame members being arranged in a non-parallel fashion with respect to each other, a hinge leg secured to the rearward end of each of said upper frame members, said hinge legs being rotatably mounted on said hinge shaft;
• a cross head shaft secured to and extending between said upper frame members forwardly of said hinge shaft, a cross head rotatably mounted on said cross head shaft;
• a hydraulic cylinder means including a cylinder portion and a rod portion;
• means connecting said rod portion to said cross head;
• and means operatively rotatably connecting said cylinder portion, about a horizontal axis, to said lower frame members adjacent the forward ends thereof.

In combination,

• a truck having a frame including a pair of horizontally spaced apart and longitudinally extending frame members,
• a dump body hingedly mounted upon the frame of the truck including a pair of longitudinally extending runsills supporting the understructure of the dump body spaced to lie over the frame members of the truck,
• and a scissor frame lift for raising and lowering said dump body relative to said truck frame,
• said scissor frame lift comprising a lower frame assembly including a horizontally disposed lower mount cross tube means having opposite ends operatively rotatably secured to mounts on the frame members, a pair of lower frame members secured to said lower mount cross tube means, each of said lower frame members including top and bottom flanges having a web extending therebetween, said webs of said lower frame members extending rearwardly and inwardly from said lower mount cross tube means, said lower frame members being arranged in a non-parallel fashion with respect to each other, a drop hinge leg secured to the rearward end of each of said lower frame members, a hinge shaft secured to and extending between said drop hinge legs;
• an upper frame assembly including an upper mount cross tube means having opposite ends operatively rotatably secured to mounts on the runsills, a pair of upper frame members secured to said upper mount cross tube, each of said upper frame members including top and bottom flanges having a web extending therebetween, said webs of said upper frame members extending rearwardly and inwardly from said upper mount cross tube, said upper frame members being arranged in a non-parallel fashion with respect to each other, a hinge leg secured to the rearward end of each of said upper frame members, said hinge legs being rotatably mounted on said hinge shaft;
• a cross head shaft secured to and extending between said upper frame members forwardly of said hinge shaft, a cross head rotatably mounted on said cross head shaft;
• a hydraulic cylinder means including a cylinder portion and a rod portion;
• means connecting said rod portion to said cross head;
• and means operatively rotatably connecting said cylinder portion, about a horizontal axis, to said lower frame members adjacent the forward ends thereof;
• said upper mount cross tube means comprising an inner cross tube rotatably positioned within a cross tube, the opposite ends of said inner cross tube being secured to the mounts on said runsills;
• said lower mount cross tube means comprising an inner cross tube rotatably positioned within a cross tube, the opposite ends of said inner cross tube being secured to the mounts on the frame members.

In combination,

• a truck having a frame including a pair of horizontally spaced apart and longitudinally extending frame members, each of said frame members having a mount thereon including a horizontally disposed shaft,
• a dump body hingedly mounted upon the frame of the truck including a pair of longitudinally extending runsills supporting the understructure of the dump body spaced to lie over the frame members of the truck, each of said runsills having a mount thereon including a horizontally disposed shaft,
• and a scissor frame lift for raising and lowering said dump body relative to said truck frame,
• said scissor frame lift comprising a lower frame assembly and an upper frame assembly,
• said lower frame assembly including a horizontally disposed lower mount outer cross tube having an inner cross tube mounted therein, the length of said outer cross tube being substantially less than the length of said inner cross tube,
• a pair of lower frame members secured to said lower mount outer cross tube;
• said upper frame assembly including an upper outer cross tube having an inner cross tube mounted therein, the length of said inner cross tube being substantially greater than the length of said outer cross tube,
• a pair of upper frame members secured to said upper outer cross tube;
• said lower frame members and said upper frame members respectively extending rearwardly from said lower mount and upper outer cross tubes and being operatively pivotally secured together at their rearward ends,
• said inner cross tube of said lower frame assembly being rotatably secured to said shafts of said mounts on said frame members of said truck,
• said inner cross tube of said upper frame assembly being rotatably secured to said shafts of said mounts on said runsills of said dump body,
• said inner cross tubes having a substantially greater length than their respective outer cross tubes so that said inner cross tubes may be selectively shortened, without shortening said outer cross tubes, as desired to compensate for various widths between the frame members of various sizes of trucks.