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. Handles around mm 5 in are generally recommended. Select tools that do NOT require wrist flexion, extension or deviation.

Figure 1 It is also important that the centre of gravity be aligned with the centre of the gripping hand. Fioetype of the tool Ideally, a worker should be able to operate a tool with one hand.

Grips that are larger than mm 4 in will be difficult for some users. Avoid twisting hand and wrist motion by using power tools rather than hand tools. This is particularly important where a considerable force must be applied with a sweaty hand. The recommended distance ffiletype the handles is between mm 2.

Hand Tool Ergonomics – Tool Design : OSH Answers

Crushing, gripping or cutting tools such as pliers or tongs are equipped with two handles. Tools above these recommendations should be supported with a counterbalance.

In other words, tools should feel “easy” to hold either in an upright position or in the position it will be used i.

The exception to this principle is a power hand tool, such as a grinder, that has to be heavy in order to reduce the force that the worker has to exert while using it. This fact makes tool selection most critical. The only effective way to reduce vibration haandle power tools is at the design stage. The weight of the tool may depend on the use:.


Download the free OSH Answers app. Add a badge to your website or intranet so your workers can quickly find answers to their health and safety questions. Hand tools should be made of non-slip, non-conductive and compressible materials.

Tool design weight, shape, 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.

With the exception of tools for precision work e. Sharp edges and contours can be covered with cushioned tape to minimize lacerations. Handle diameter recommendations vary. Blunt or dull tools such as scissors, cutters, saws, screwdriver tips, in fact any tools in a poor state of repair, not only compromise safety but also increase sometimes by a factor of ten the effort needed to use them.

Shaped tools such as bent-handle tools are effective where most of the tasks are done in the same plane and height as the arm and hand, and when only one or two other tools are used see Figure 5. 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.

The larger diameter will allow for maximum torque, while the smaller diameter helps with dexterity and speed.

Minimize the amount of force needed to activate trigger devices on power tools. The belief that smaller tools should have smaller handles while larger tools have larger ones is debatable. Separation distance between handles for crushing, gripping or clipping tools such as pliers or tongs.

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. For precision grips, a diameter of 12mm 0. Avoid repetitive finger movements, or at least reduce their number.

CCOHS is not liable for any loss, claim, or fileype arising directly or indirectly from any use or reliance upon the information.


In general, cylindrical handles at 40mm 1. Handles Fuletype the exception of tools for precision work e. Reduce excessive gripping force or pressure. A handle that is too short can cause unnecessary compression in the middle of the palm. Vibration The only effective way to reduce vibration in power tools is at the design stage.

Handle shape Tools with “bent” or angled handles or tools with pistol-grips are beneficial where the force is exerted in a straight line in the same direction as the straightened forearm and wrist, especially when the force must be applied horizontally see Figures 2, 3, 4.

Avoid or limit vibration.

Hand Tool Ergonomics – Tool Design

The crucial ergonomic principle in tool use and design — bend the tool, not the wrists — however correct and valuable does ergono,ic always prevent discomfort and injuries when bent-handle tools are used indiscriminately, regardless of the layout of the work situation. For example, textured rubber handles provide a good grip, reduce the effort needed to use the tool effectively, and prevent the filteype from slipping out of the hand. OSH Answers Fact Sheets Easy-to-read, question-and-answer fact sheets covering a wide range of workplace health and safety topics, from hazards to diseases to ergonomics to workplace promotion.

To ensure a good grip on a handle, sufficient friction filetupe exist between the hand and the handle. Avoid extreme and awkward joint positions. 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.

It is also important that the centre of gravity be aligned with the centre of the gripping hand. Handles made of plastics or compound rubber are recommended.