Patent ID: 7523994
Filing Date: 2009-04-28
Classification: B60P

Abstract:
1. A hoist for raising or lowering a truck bed to and from a truck frame which is capable of being located between said bed and said frame, said hoist comprising: a first lever arm having a first end connected to a truck chassis via a first pivot and having a second end connected to a first end of a second lever arm via a second pivot, said second lever arm having a second end pivotally connected to a dump bed chassis via a third pivot; an extendible and retractable cylinder connected at a first end via a fourth pivot and connected at a second end to said second lever arm via a fifth pivot, said fifth pivot located on said second lever arm between said second pivot and said third pivot; wherein in an initial, non-lift position, said first lever arm and said second lever arm are in or near generally parallel orientations with respect to one another and said fourth pivot is located generally below said first pivot a selected offset distance sufficient to improve said cylinder's lift angle relative to a lift direction of said dump chassis; wherein in a lifting phase, said cylinder extends and exerts a lifting force on said second lever arm via said fifth pivot causing said second lever arm to exert a lifting force on said dump bed chassis via said third pivot; and wherein said first lever arm and said second lever arm pivot out of the generally parallel orientations towards a dump bed lifted position.