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 .

Author: Tale Gazuru
Country: China
Language: English (Spanish)
Genre: Sex
Published (Last): 1 November 2012
Pages: 482
PDF File Size: 20.46 Mb
ePub File Size: 6.82 Mb
ISBN: 164-4-69599-222-1
Downloads: 6834
Price: Free* [*Free Regsitration Required]
Uploader: Daigore

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.

Glossy coatings and highly polished handles should be avoided. The weight of the tool may depend on the use: Handle diameter recommendations vary. Handles made of plastics or compound rubber are recommended.

Avoid or limit vibration. Although every effort is made to ensure the accuracy, currency and completeness of the information, CCOHS does not guarantee, warrant, represent or undertake that the information provided is correct, accurate or current.

Hand Tool Ergonomics – Tool Design

The crucial ergonomic principle in tool use and design — bend the tool, not desigh wrists — however correct and valuable does not always prevent discomfort and injuries when bent-handle tools are used indiscriminately, regardless of the layout of the work situation. A handle that is too short can cause unnecessary compression in the middle of the palm. In general, cylindrical handles at 40mm 1. Avoid extreme and awkward joint positions. Tool handles should be not less than mm 4 in to reduce the negative effects of any compression exerted.

Search all fact sheets:.

Type a word, a phrase, or ask a question. The recommended distance separating the handles is between mm 2. Download the free OSH Answers app. Avoid repetitive finger movements, or at least reduce their number. 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. The electrical and heat insulation properties of the handles are important for power hand tools.


To ensure a good grip on a handle, sufficient friction must exist between the hand and the handle. One of the most effective ways in reducing injury risk associated with the use of manual hand tools is to replace them with ergonomiic tools.

Handoe 1 It is also important that the centre of gravity be aligned with the centre of the gripping hand. Grips that are larger than mm 4 in will be difficult for some users.

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.

Hand Tool Ergonomics – Tool Design : OSH Answers

Always conduct a risk assessment before making any change. The larger diameter will allow for maximum torque, while the smaller diameter helps with dexterity and speed. In other words, tools should feel “easy” to hold either in an upright position or in the position it will be used i. OSH Answers Fact Hsndle Easy-to-read, question-and-answer fact sheets covering a wide range of giletype health and safety topics, from hazards to diseases to ergonomics to workplace promotion.

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

An effective prevention strategy must address all aspects at the same time. The hanndle 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.

Handles around mm 5 in are generally recommended. This fact makes tool selection most critical. 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. Weight of the tool Ideally, a worker should be able to operate a tool with one hand. Hand tools should be made of non-slip, non-conductive and compressible materials.


CCOHS is not liable for any loss, desogn, or demand arising directly or indirectly from any use or reliance upon the information. Vibration The only effective way to reduce vibration in power tools is at the design stage. With the exception of tools for precision work e. Tools with larger or smaller spans will reduce one’s maximum ergoomic strength.

For precision grips, a diameter of 12mm 0. 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.

Separation distance between handles for crushing, gripping or clipping tools such as pliers or tongs. It is also important that jandle centre of gravity be aligned with the centre of the gripping hand. Tool design weight, shape, fit dssign 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.

It should extend across the entire breadth of the palm. This is particularly important where a considerable force must be applied with a sweaty hand.

Minimize the amount of force needed to handdle trigger devices on power tools. Keep in mind that the use of gloves requires longer tool handles. Reduce excessive gripping force or pressure. 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.

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.