Express. Average Cost per CTD Claim Before & After Ergonomic Typing. ▻ Manual materials handling . You can design a safer lifting environment by. It is intended as a basic text for a first course in Human Factors/Ergonomics .. handle? (Control-display compatibility is a useful design concept; see Chapter 13 . ERGONOMICS FOR THE Ergonomics is the science of fitting the job to the worker. Bent or curved handles; Extensions or add-ons; Headphones; Support .

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An effective prevention strategy must address all aspects at the same time. The belief that smaller tools should have smaller handles while larger tools have larger ones is debatable.

Hand Tool Ergonomics – Tool Design

Figure 1 It is also important that the centre of gravity be aligned with the centre of the gripping hand. Handles around mm 5 in eesign generally recommended. Avoid twisting hand and wrist motion by using power tools rather than fileytpe tools.

Tool design weight, handlee, fit to the user and the taskworkstation design size, shape and layoutand the way tasks are scheduled are all key factors in making hand tool use safe and risk-free. Although every effort is made to ensure the deisgn, currency and completeness of the information, CCOHS does not guarantee, warrant, represent or undertake that the information provided is correct, accurate or current.

For example, textured rubber handles provide a good grip, reduce the effort needed to use the tool effectively, and prevent the tool from slipping out of the hand. When selecting and using a hand tool it is important to: Keep in mind that the use of gloves requires longer tool handles. Hand tools should be made of non-slip, non-conductive and compressible materials. Grips that are larger than mm 4 in will be difficult for some users.


The condition of tools is an important factor. Select tools that do NOT require wrist flexion, extension or deviation. For example, drills that are “front-heavy” will require effort especially in the wrist and forearm to hold in a usable position and should be avoided. Add a badge to your website or intranet so your workers can quickly find answers to their health and safety questions. Tools with larger or smaller spans will reduce one’s maximum grip strength.

When manual hand tools are used for tasks that require the frequent and repetitive use of force to perform a task or job, the risk of contracting an WMSD increases. To ensure a good grip on a handle, sufficient friction must exist between the hand and the handle.

Handles made of plastics or compound rubber are recommended. Knowing the tasks and the layout of the workplace where they will be used is vital for selecting the right tools for any given job. It should extend across the entire breadth of the palm.

Hand Tool Ergonomics – Tool Design : OSH Answers

The electrical and heat insulation properties of the handles are important for power hand tools. In other words, select tools that allow you to keep the wrist straight or in a neutral position. Avoid or limit vibration. A longer trigger which allows the use of two or three fingers to activate them reduces discomfort and minimizes the risk for injury.

Search all fact sheets:. Minimize the amount of force needed to ddsign trigger devices on power tools.

It is also important that the centre of gravity be aligned with the centre of the gripping hand. Type a word, a phrase, or ask a question. Separation distance between handles for crushing, gripping or clipping tools such as pliers or tongs.


Vibration The only effective way to reduce vibration in power tools is at the design stage. For precision grips, a diameter of 12mm 0. Handle diameter recommendations vary.

One of the most effective ways in reducing injury risk associated with the use of manual hand tools is to replace them with power tools. CCOHS is not liable for any loss, claim, or demand arising directly or indirectly from any use or reliance upon the information. Tools above these recommendations should be supported with a counterbalance.

The recommended distance separating the handles is between mm 2. Tools with straight handles are for tasks where the force is exerted perpendicular to the straightened forearm and wrist, for instance, when the force must be applied vertically.

The only effective way to reduce vibration in power tools is at the design stage. Download the free OSH Answers app. Always conduct a risk assessment before making any change. Tool handles should be not less than mm 4 in to reduce the negative effects of any compression exerted. In general, cylindrical handles at 40mm 1. Handle shape Tools with “bent” or angled handles or tools with pistol-grips are beneficial where the force is exerted in a straight line fesign the same direction as the straightened forearm and wrist, especially when the force must be applied horizontally see Figures 2, 3, 4.

Avoid extreme and awkward joint positions.