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US 5,513,901 AGranted
Hoist mechanism
AssigneeThe Heil Co.
InventorsFred P. Smith, William R. Johnson, Fred T. Smith
Life of this patent
Estimating the term…
Abstract
A hoist mechanism including a hoist subframe, a body subframe, a dump linkage pivotally coupling the body subframe to the hoist subframe such that the body subframe pivots about an instant center which moves continuously as the body subframe pivots and an actuator for moving the body subframe between a lowered position and a raised position. The instant center is positioned at a point below the hoist subframe with the body subframe in the lowered position, and progresses to a point above the hoist subframe as the body subframe is lifted to the raised position.
Claims26
A hoist mechanism comprising:
- a hoist subframe;
- a body subframe;
- a linkage coupling said body subframe to said hoist subframe such that said body subframe pivots about a continuously moving instant center of rotation, said instant center of rotation is positioned at a point below said hoist subframe with said body subframe in the lowered position and progresses upward as said body subframe is lifted to said raised position;
- and
- actuating means for moving said body subframe with respect to said hoist subframe between a lowered position and a raised position.
2 more elements
A hoist mechanism comprising:
- a hoist subframe having a forward end and a rearward end;
- a body subframe having a forward end and a rearward end;
- a front link assembly pivotally coupled between said hoist subframe and said body subframe intermediate said forward ends and said rearward ends thereof, said front link assembly including:
- a toggle link having a first end pivotally coupled to said hoist subframe intermediate said forward end and said rearward end;
- a front link having a first end pivotally coupled to a second end of said toggle link and a second end pivotally coupled to said body subframe intermediate said forward end and said rearward end;
- and
- a motion link having a first end pivotally coupled to said toggle link and a second end pivotally coupled to said body subframe rearward of said second end of said front link;
- a back link having a first end pivotally coupled to said hoist subframe proximate said rearward end thereof, and a second end pivotally coupled to said body subframe proximate said rearward end thereof;
- and
- actuating means for pivoting said body subframe about said hoist subframe between a lowered position and a raised position.
7 more elements
A dump vehicle comprising:
- a vehicle chassis having a frame;
- a dump body;
- and
- a hoist mechanism pivotally coupling said dump body to said frame, said hoist mechanism including:
- a linkage pivotally coupling said dump body to said frame such that said dump body pivots about an instant center of rotation which moves continuously as said dump body pivots, said instant center of rotation is positioned at a point below said frame with said dump body in the lowered position and progresses upward as said dump body is lifted to said raised position;
- and
- actuating means for pivoting said dump body about said frame between a lowered position and a raised position.
4 more elements
A dump vehicle comprising:
- a vehicle chassis having a frame;
- a dump body;
- and
- a hoist mechanism pivotally coupling said dump body to said frame, said hoist mechanism including:
- a front link assembly coupled between said frame and said dump body intermediate forward ends and rearward ends thereof, said front link assembly including:
- a toggle link having a first end pivotally coupled to said frame intermediate said forward end and rearward end;
- a front link having a first end pivotally coupled to a second end of said toggle link and a second end pivotally coupled to said dump body intermediate said forward end and said rearward end;
- and
- a motion link having a first end pivotally coupled to said toggle link and second end pivotally coupled to said dump body rearward of said second end of said front link;
- a back link having a first end pivotally coupled to said frame proximate said rearward end thereof, and a second end pivotally coupled to said dump body proximate said rearward end thereof;
- and
- actuating means for pivoting said dump body about said frame between a lowered position and a raised position.
9 more elements
Dependencies are inferred from the claim text.