Vertical lift trailer

Claim 2

A trailer comprising a fore and aft extending carrying frame, a pair of ground engaging wheels on opposite sides of the frame, each of said wheels having an axle, and elongated supporting arm connected at one end of each axle respectively, and extending forwardly therefrom, means swingably connecting the other ends of the supporting arms to the frame for swinging movement about transverse axes, thereby to shift the wheels between lowered and elevated positions relative to the frame, an elongated leaf spring rigidly connected at one end to each of said supporting arms and extending rearwardly therefrom, guide bearing means connected to the frame beneath the leaf springs, cables connected to the upper ends of the leaf springs and trained around the guide bearing means and operating means on the frame connected to said cables for selectively swinging the wheels from their elevated positions to their lowered positions and permitting their return to their elevated positions, said operating means comprising an elongated rotatable screw mounted in a fore and aft extending position on the frame, a travelling nut on the screw to which the cables are attached and a crank for rotating the screw so as to move the nut longitudinally of the frame and thereby operate the cables against the leaf springs.

Claim 3

A trailer comprising a fore and aft extending carrying frame, a transversely extending open-ended tubular housing connected to the frame forwardly of the after end of the latter, a pair of ground engaging wheels on opposite sides of the frame, each of said wheels having an axle, an elongated supporting arm connected at one end to each axle, respectively, and extending forwardly therefrom, stub shafts extending from the other ends of the supporting arms for rotatably and slidably fitting in the open ends of the tubular housing, thereby permitting the wheels to shift between lowered and elevated positions relative to the frame, restraining brackets removably connected to the frame and engaging the stub shafts to prevent their withdrawal from the housing, an elongated leaf spring rigidly connected at one end to each of said supporting arms and extending rearwardly therefrom, guide bearing means connected to the frame beneath the leaf springs, cables connected to the other ends of the leaf spring and trained around the guide bearing means and operating means on the frame connected to said cables for selectively swinging the wheels from their elevated to their lowered positions and permitting their return to their elevated positions, said means comprising an elongated rotatable screw mounted in a fore and aft extending position on the frame, a travelling nut on the screw to which the cables are attached and a crank for rotating the screw so as to move the nut longitudinally of the frame and thereby operate the cables against the leaf springs.

Claim 4

A trailer comprising a fore and aft extending carrying frame, a transversely extending open-ended tubular housing connected to the frame forwardly of the after end of the latter, a pair of ground engaging wheels on opposite sides of the frame, each of said wheels having an axle, an elongated supporting arm connected at one end to each axle, respectively, and extending forwardly therefrom, stub shafts extending from the other ends of the supporting arms for rotatably and slidably fitting in the open ends of the tubular housing, thereby permitting the wheels to shift between lowered and elevated positions relative to the frame, restraining brackets removably connected to the frame and engaging the stub shafts to prevent their withdrawal from the housing, an elongated leaf spring rigidly connected at one end to each of said supporting arms and extending rearwardly therefrom, guide bearing means connected to the frame beneath the leaf springs, cables connected to the other ends of the leaf spring and trained around the guide bearing means and operating means on the frame connected to said cables for selectively swinging the wheels from their elevated to their lowered positions and permitting their return to their elevated positions, said means comprising an elongated rotatable screw mounted in a fore and aft extending position on the frame, a travelling nut on the screw to which the cables are attached and a crank for rotating the screw so as to move the nut longitudinally of the frame and thereby operate the cables against the leaf springs.

Claim 5

A trailer as claimed in claim 1, in which said elongated leaf springs are attached to their respective supporting arms rearwardly of the connection between the supporting arms and said axles.

Claim 6

A trailer as claimed in claim 2, in which said elongated leaf springs are attached to their respective supporting arms rearwardly of the connection between the supporting arms and said axles.

Claim 7

A trailer comprising a fore and aft extending carrying frame, a pair of ground engaging wheels on opposite sides of the frame, each of said wheels having an axle, an elongated supporting arm connected at one end to each axle, respectively, and extending therefrom, means swingably connecting the forward ends of the supporting arms to the frame for swinging movement about transverse axes thereby to shift the wheels between lowered and elevated positions relative to the frame, an elongated leaf spring rigidly connected at one end to each of said supporting arms and extending rearwardly therefrom guide bearing means connected to the frame beneath the leaf springs, cables connected to the other ends of the leaf springs and trained around the guide bearing means and operating means on the frame connected to said cables for selectively swinging the wheels from their elevated positions to their lowered positions and permitting their return to their elevated positions, said operating means comprising an elongated rotatable screw mounted in a fore and aft extending position on the frame, a travelling nut on the screw to which the cables are attached and means for rotating the screw to move the nut longitudinally of the frame and thereby operate the cables against the leaf springs.

Claim 8

A trailer comprising a fore and aft extending carrying frame, a pair of ground engaging wheels on opposite sides of the frame, each of said wheels having an axle, an elongated supporting arm connected at one end to each axle, respectively, and extending therefrom, means swingably connecting the forward ends of the supporting arms to the frame for swinging movement about transverse axes thereby to shift the wheels between lowered and elevated positions relative to the frame, an elongated leaf spring rigidly connected at one end to each of said supporting arms and extending rearwardly therefrom guide bearing means connected to the frame beneath the leaf springs, cables connected to the other ends of the leaf springs and trained around the guide bearing means and operating means on the frame connected to said cables for selectively swinging the wheels from their elevated positions to their lowered positions and permitting their return to their elevated positions, said operating means comprising an elongated rotatable screw mounted in a fore and aft extending position on the frame, a travelling nut on the screw to which the cables are attached and means for rotating the screw to move the nut longitudinally of the frame and thereby operate the cables against the leaf springs.

Claim 9

A trailer as claimed in claim 5, in which said elongated leaf springs are attached to their respective supporting arms rearwardly of the connection between the supporting arms and said axles.