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Stair-climbing carrier

  • US 4,027,889 A
  • Filed: 11/10/1975
  • Issued: 06/07/1977
  • Est. Priority Date: 11/10/1975
  • Status: Expired due to Term
First Claim
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1. A tracked carrier for carrying loads in a tilted position across floors and up and down stairs, and comprisingan elongate load-carrying frame with means to which a load may be attached along the elongate frame, the frame having upper and lower ends,a spaced pair of elongate, parallel, endless tracks extending along opposite sides of the frame and being movable in elongated paths to drive the frame along a supporting surface and up and down stairs, the tracks extending beyond the lower end of the frame to support the frame upon such a supporting surface when the frame is tipped to upright and inclined positions;

  • a lifting arm pivotally mounted at one end to the frame adjacent the lower end thereof, and having a floor-engaging caster at its other end, the lifting arm being configured for reception within the frame between the tracks when swung upwardly into a retracted position with the caster nearer the upper than the lower end of the tracks, and the arm being swingable to near horizontal position when the elongate frame is supported in upright position on the lower ends of the elongate endless tracks and against a load to be tipped into inclined transport position; and

    means for controllably swinging the lifting arm outwardly from its retracted position to support the frame in an inclined angle with the floor for travel therealong on the caster wheel and the lower ends of the elongate endless tracks.

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