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Transcript

Stability Pyramid

Summary

  • Lines of stability connect at each drive wheel, the center of the steer axle and at the highest point of the forklift above the CG/CCG
  • The CG/CCG must remain within the lines of stability at all times
  • If the CG/CCG touches or passes the lines of stability the lift will tip
  • Load, mast tilt/height, grade/slope, momentum, centrifugal force all affect the position of the CG/CCG

IKEA Coquitlam

Learning Objectives

1. Basic Principles of the Stability Pyramid

2. Center of Gravity

3. What factors affect the Stability of a forklift

Center of gravity

The stability triangle is defined by the lines that connect each drive wheel (b & c) to the center of the steer axle (a).

Within the triangle lies the forklift's center of gravity (d).

The center of gravity (CG) of any object is the single point at which the object is balanced in all directions.

Without a load, the forklift's CG is positioned near the counterweight (battery)

When a load is lifted, the CG of the load and the CG of the forklift join together to form a combined center of gravity (CCG).

Lines of stability also extend vertically and join at the single highest point of the forklift above the CG or CCG.

This forms the stability pyramid !

The CG/CCG must always remain within the boundaries of the stability pyramid at all times. If it touches or crosses the lines of stability, the lift will tip over.

  • Load
  • Mast tilt
  • Mast height
  • Grade/Slope

Will affect the position of the forklift's CCG even when not in motion.

  • Centrifugal force

(turning)

  • Momentum

(Stopping & Starting)

Will affect the position of the forklift's CCG when in motion.

The overall stability of a forklift is dependent on the location of the CG or CCG within the stability pyramid. Any movement in the forklift will also move the CG/CCG.

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