Elevating trailer

Claim 2

In an elevatable trailer; a frame having a forward end and opposite sides; a pair of bell crank arms each pivotally mounted on said frame on a horizontal axis at each opposite side of said frame; said horizontal axes of said bell crank arms being spaced apart relative to each other in a direction relative to said forward end of said frame; wheels rotatably mounted on said bell crank arms in spaced relation to said respective horizontal axes; cantilever members fixed to said bell crank arms and having end portions extending a substantial distance upwardly from said horizontal axis; connecting rods pivotally coupled to said end portions of said cantilever members; an actuating lever pivoted to said frame on each side thereof at a location between the pivotal axes of said bell crank arms; a cross bar having opposide ends pivotally coupled to said actuating levers; a tongue coupled to said cross bar and having a forward end extending beyond said forward portion of said frame; a hitch coupled to said forward end of said tongue; a tongue guide carried by said forward portion of said frame; said tongue reciprocally mounted to move to forward and rear positions relative to said tongue guide; releasable latch means disposed to lock said tongue in said forward position for holding said bell crank arms in a pivoted position wherein said frame and said horizontal axes are in elevated position; and an equalizer lever having an intermediate portion pivotally mounted on each of said actuating levers; each equalizer lever having opposite ends; and said connecting rods at each side of said frame pivotally coupled to said opposite ends of said equalizer levers.

Claim 3

The invention as defined in claim 1, wherein: intermediate levers pivotally interconnect said cross bar and said frame; tension rods pivotally interconnecting said intermediate levers and said actuating levers; each intermediate lever having one end pivotally coupled to said frame; each intermediate lever having another end pivotally coupled to said cross bar; a respective one of said tension rods pivotally coupled to a respective one of said actuating levers at a location between the ends thereof.

Claim 4

In an elevatable trailer; a frame having a forward end and opposite sides; bell crank arms pivotally mounted on said frame on horizontal axis at opposite sides of said frame; wheels rotatably mounted on said bell crank arms in spaced relation to said horizontal axis; cantilever members fixed to said bell crank arms and having shackle portions extending a substantial distance upwardly from said horizontal axis; tension rods pivotally coupled to said shackle portions; said tension rods extending towards said forward end of said frame; a cross bar having opposite ends pivotally coupled to said tension rods; a tongue coupled to said cross bar and having a forward end extending beyond said forward portion of said frame; a hitch coupled to said forward end of said tongue; a tongue guide carried by said forward portion of said frame; said tongue reciprocally mounted to move to forward and rearward positions relative to said tongue guide; and releasable latch means disposed to lock said tongue in said forward position for holding said bell crank arms in a pivoted position wherein said frame and said horizontal axis are in elevated position; a pair of said bell crank arms and a pair of said members are disposed at each of said opposite sides of said frame; a pair of second tension rods; said shackle portions of each pair of bell crank arms on each side of said frame pivotally coupled to said second tension rods.

Claim 5

In an elevatable trailer; a frame having a forward end and opposite sides; bell crank arms pivotally mounted on said frame on horizontal axis at opposite sides of said frame; wheels rotatably mounted on said bell crank arms in spaced relation to said horizontal axis; cantilever members fixed to said bell crank arms and having shackle portions extending a substantial distance upwardly from said horizontal axis; tension rods pivotally coupled to said shackle portions; said tension rods extending towards said forward end of said frame; a cross bar having opposite ends pivotally coupled to said tension rods; a tongue coupled to said cross bar and having a forward end extending beyond said forward portion of said frame; a hitch coupled to said forward end of said tongue; a tongue guide carried by said forward portion of said frame; said tongue reciprocally mounted to move to forward and rearward positions relative to said tongue guide; and releasable latch means disposed to lock said tongue in said forward position for holding said bell crank arms in a pivoted position wherein said frame and said horizontal axis are in elevated position; a pair of said bell crank arms and a pair of said members are disposed at each of said opposite sides of said frame; a pair of second tension rods; said shackle portions of each pair of bell crank arms on each side of said frame pivotally coupled to said second tension rods.

Claim 6

In an elevatable trailer; a frame having a forward end and opposite sides; bell crank arms pivotally mounted on said frame on horizontal axis at opposite sides of said frame; wheels rotatably mounted on said bell crank arms in spaced relation to said horizontal axis; cantilever members fixed to said bell crank arms and having shackle portions extending a substantial distance upwardly from said horizontal axis; tension rods pivotally coupled to said shackle portions; said tension rods extending towards said forward end of said frame; a cross bar having opposite ends pivotally coupled to said tension rods; a tongue coupled to said cross bar and having a forward end extending beyond said forward portion of said frame; a hitch coupled to said forward end of said tongue; a tongue guide carried by said forward portion of said frame; said tongue reciprocally mounted to move to forward and rearward positions relative to said tongue guide; and releasable latch means disposed to lock said tongue in said forward position for holding said bell crank arms in a pivoted position wherein said frame and said horizontal axis are in elevated position; said cantilever members being plate springs; backup members on one side of said plate springs opposite to the direction in which said springs flex in response to load; and brakes on said wheels for stopping said trailer; said backup members being disposed to resist the tongue reaction of said bell crank arms turning to flex said springs in a direction opposite to the load bearing direction of deflection of said springs.

Claim 7

In an elevatable trailer; a frame having a forward end and opposite sides; bell crank arms pivotally mounted on said frame on horizontal axis at opposite sides of said frame; wheels rotatably mounted on said bell crank arms in spaced relation to said horizontal axis; cantilever members fixed to said bell crank arms and having shackle portions extending a substantial distance upwardly from said horizontal axis; tension rods pivotally coupled to said shackle portions; said tension rods extending towards said forward end of said frame; a cross bar having opposite ends pivotally coupled to said tension rods; a tongue coupled to said cross bar and having a forward end extending beyond said forward portion of said frame; a hitch coupled to said forward end of said tongue; a tongue guide carried by said forward portion of said frame; said tongue reciprocally mounted to move to forward and rearward positions relative to said tongue guide; and releasable latch means disposed to lock said tongue in said forward position for holding said bell crank arms in a pivoted position wherein said frame and said horizontal axis are in elevated position; said cantilever members being plate springs; backup members on one side of said plate springs opposite to the direction in which said springs flex in response to load; and brakes on said wheels for stopping said trailer; said backup members being disposed to resist the tongue reaction of said bell crank arms turning to flex said springs in a direction opposite to the load bearing direction of deflection of said springs.

Claim 8

The invention as defined in claim 1, wherein: said cantilever members comprise multi leaf springs.

Claim 9

In an elevatable trailer; a frame having a forward end and opposite sides; bell crank arms pivotally mounted on said frame on horizontal axis at opposite sides of said frame; wheels rotatably mounted on said bell crank arms in spaced relation to said horizontal axis; cantilever members fixed to said bell crank arms and having shackle portions extending a substantial distance upwardly from said horizontal axis; tension rods pivotally coupled to said shackle portions; said tension rods extending towards said forward end of said frame; a cross bar having opposite ends pivotally coupled to said tension rods; a tongue coupled to said cross bar and having a forward end extending beyond said forward portion of said frame; a hitch coupled to said forward end of said tongue; a tongue guide carried by said forward portion of said frame; said tongue reciprocally mounted to move to forward and rearward positions relative to said tongue guide; and releasable latch means disposed to lock said tongue in said forward position for holding said bell crank arms in a pivoted position wherein said frame and said horizontal axis are in elevated position; a wheel holding device for each of said wheels comprising a disc member coupled to each respective wheel; said disc member having abutment members disposed in an arcuate row thereon; a pawl member pivotally mounted on a respective bell crank arm and adapted to be pivoted into interference with said abutment members; each pawl member having a stop member engageable therewith and said stop member being mounted on a respective bell crank arm; and a resilient handle on said pawl member adapted to pivot it into and out of position relative to the abutment members and a handle holding device having spaced apart retainer portions adapted to retain said resilient handle in either of two positions in which it resiliently is deflected and in which it holds the pawl member in either one of the aforementioned positions either to be out of interference with said abutment portions or in interference therewith whereby said wheels may be locked and attain frictional engagement with the surface on which they rest so that forward movement of said hitch will actuate said bell cranks and pivot them to elevate said frame of said trailer upwardly relative to the surface on which said wheels are engaged.

Claim 10

In an elevatable trailer; a frame having a forward end and opposite sides; bell crank arms pivotally mounted on said frame on horizontal axis at opposite sides of said frame; wheels rotatably mounted on said bell crank arms in spaced relation to said horizontal axis; cantilever members fixed to said bell crank arms and having shackle portions extending a substantial distance upwardly from said horizontal axis; tension rods pivotally coupled to said shackle portions; said tension rods extending towards said forward end of said frame; a cross bar having opposite ends pivotally coupled to said tension rods; a tongue coupled to said cross bar and having a forward end extending beyond said forward portion of said frame; a hitch coupled to said forward end of said tongue; a tongue guide carried by said forward portion of said frame; said tongue reciprocally mounted to move to forward and rearward positions relative to said tongue guide; and releasable latch means disposed to lock said tongue in said forward position for holding said bell crank arms in a pivoted position wherein said frame and said horizontal axis are in elevated position; a wheel holding device for each of said wheels comprising a disc member coupled to each respective wheel; said disc member having abutment members disposed in an arcuate row thereon; a pawl member pivotally mounted on a respective bell crank arm and adapted to be pivoted into interference with said abutment members; each pawl member having a stop member engageable therewith and said stop member being mounted on a respective bell crank arm; and a resilient handle on said pawl member adapted to pivot it into and out of position relative to the abutment members and a handle holding device having spaced apart retainer portions adapted to retain said resilient handle in either of two positions in which it resiliently is deflected and in which it holds the pawl member in either one of the aforementioned positions either to be out of interference with said abutment portions or in interference therewith whereby said wheels may be locked and attain frictional engagement with the surface on which they rest so that forward movement of said hitch will actuate said bell cranks and pivot them to elevate said frame of said trailer upwardly relative to the surface on which said wheels are engaged.