Safety & Compliance · SOP

Pushing Pulling Force Measurement for Carts

This procedure documents how to measure the static and dynamic push/pull forces required to move industrial carts. Results are compared against ergonomic thresholds (WorkSafeBC & CSA Z432) to prevent over‑exertion injuries and guide engineering controls.

Estimated Time

15 min

Difficulty

Intermediate

Regulation

CSA Z432 / WorkSafeBC Ergo

Version

1.0

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Purpose

To establish a repeatable, accurate method for measuring the force required to push and pull industrial carts under representative load conditions. The data collected supports ergonomic risk assessments, informs load reduction decisions, and verifies compliance with regulatory force limits (e.g., WorkSafeBC maximum initial force of 225 N, sustained 100 N).

Scope

This SOP applies to two‑wheeled and four‑wheeled industrial carts, platform trucks, and hand‑operated mobile equipment used in warehousing, manufacturing, and distribution facilities. It covers both static (breakaway) and dynamic (rolling) force measurements on dry, level concrete or asphalt surfaces. Carts with powered assistance, fully automated guided vehicles, or off‑road casters are excluded.

Safety Precautions

LOADDo not exceed the cart’s rated capacity. Verify the total loaded weight with a calibrated floor scale before measuring.
GRIPWear close‑fitting gloves to prevent hand fatigue. Ensure the force gauge handle is dry and debris‑free.
POSTMaintain a neutral spine. Do not jerk or yank the gauge — apply force smoothly to avoid muscle strain or inaccurate readings.
CLEARClear the test path of personnel, tripping hazards, and obstructions. Mark a 5 m straight‑line corridor with tape.

Required Tools & Materials

Digital force gauge (push‑pull type, minimum 500 N capacity, ±1 N accuracy) with peak‑hold function
Industrial cart with representative load (actual operating weight verified by floor scale)
Measuring tape (at least 5 m) for path length and handle height verification
Marking tape or chalk to define a 5 m straight test corridor
Calibrated floor scale or platform scale (accuracy ±1 kg)
Camera or clipboard with data collection sheet (include fields: date, operator, cart ID, load weight, push/pull static, push/pull dynamic)

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Procedure: Step-by-Step

1 Prepare the cart and load. Load the cart to its typical operating weight (verified by floor scale). Inflate tires to manufacturer specification. Ensure casters are clean and floor surface is dry and level.

2 Position the force gauge. Attach the gauge to the cart handle at standard push height (hip height, approximately 0.9 m). Zero the gauge while it is held horizontally.

3 Measure static push force. Apply a steady, increasing force until the cart begins to move. Record the peak force displayed. Repeat three times and take the average. Re‑zero between trials.

4 Measure static pull force. Reattach the gauge for pulling (hook to the rear of the cart at same hip height). Apply steady backward force until motion starts. Record peak value, average over three trials.

5 Measure dynamic rolling force. Once the cart is moving at walking speed (~1 m/s), measure the force required to maintain constant speed. Record the stable reading and average over a 5‑second window.

6 Compare against ergonomic limits. Check recorded forces against the WorkSafeBC ergonomic threshold of 225 N for initial push/pull (static) and 100 N for sustained dynamic force. If exceeded, reduce load, improve caster quality, or implement mechanical assist devices (e.g., powered tugger). Document results on the form provided.

Pushing Pulling Force Measurement for Carts

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