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Linkage arrangement for a multi-purpose vehicle

  • US 5,188,502 A
  • Filed: 12/24/1990
  • Issued: 02/23/1993
  • Est. Priority Date: 12/24/1990
  • Status: Expired due to Term
First Claim
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1. A linkage arrangement adapted for connecting a work implement to a frame of a vehicle comprising:

  • a pair of lift arms having a first end portion connected to the vehicle frame and a second end portion connected to the work implement, said lift arms being positioned in spaced, parallel relation to each other on opposite sides of a longitudinal centerline defined by the vehicle;

    a lifting means for providing movement of the lift arms about the first end portions thereof in a generally vertical plane, said lifting means being positioned in generally vertical alignment with each of the respective lift arms;

    a pair of first tilt links having a first end portion pivotally mounted to the work implement and a second end portion, said first tilt links being positioned in substantially the same vertical plane as that of the respective lift arms;

    a pair of second tilt links having a first end portion pivotally connected to the respective lift arms and a second end portion pivotally mounted to the first tilt links at a location that is intermediate the first and second end portions of the first tilt links, said second tilt links being positioned in substantially the same vertical plane as that of the respective lift arms;

    a tilting means for providing rotation of the work implement about its mounting to the lift arms, said tilting means having a pair of fluid actuated cylinders pivotally connected directly between the respective second end portions of the first tilt links and the vehicle frame and positioned in substantially the same vertical plane as that of the respective lift arms; and

    electronic control means for measuring the actual angular relationship of the work implement with respect to the lift arms, calculating the variance between said actual angular relationship of the work implement to that of a predetermined angular relationship of the work implement with respect to the vehicle and controlling the tilting means to achieve and maintain said predetermined angular relationship of the work implement throughout the movement of the lift arms.

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