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January 2005.pdf - Electrical Business Magazine

January 2005.pdf - Electrical Business Magazine

January 2005.pdf - Electrical Business Magazine

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TOOLS FOR THE TRADE //Evolving ergonomicsfor power toolsBY GABRIEL CONCARIAlthough the word ‘ergonomics’ was not coined until1857, mankind has employed the concept ofergonomics for thousands of years. In fact, from prehistorictools to cordless drills, whenever manused/modified tools to accomplish tasks he could not do withhis bare hands, he was practicing ergonomics.‘Ergonomics’ was derived from the Greek words ergon (work)and nomos (principle or law) by a Polish scholar namedWojciech Jastrzebowski, and has come to signify the study anddesign of work and equipment in relation to the physiologicaland psychological capabilities of people. Assuch, one can see why ergonomics plays an integralrole in the evolution of the tool industry.After all, several work factors can affect the healthand performance of hand tool users. According to theCanadian Centre for Occupational Health and Safety(CCHOS), major factors include:• static load on arms and upper body muscles• awkward working positions and body postures• tissue compression• vibrationIn the past decade, advancements in plastics, elastomersand metallurgy have made it possible for toolmanufacturers to enhance the comfort and durabilityof their products. For example, the contour and feel ofa drill handle, the improved balance and weight of anailer as well as the controls on a compressor, have allbeen enhanced as a result of ergonomic design.Due to these improvements, toolmakers have beenable to create truly innovative products that are lighter,more powerful and easier to use than their predecessors—allwhile meeting the needs of the tradesperson.In this evolving process, design options best accommodatingpeople’s capabilities and limitations are weighedheavily, which helps ensure products meet the needs oftarget users.Key ergonomic features for power toolsWeight and balanceIdeally, a user should be able to operate a tool usingone hand. During repetitive and long periods of use,the user should take frequent breaks and use twohands to support the product (if necessary). The toolshould feel well balanced with the centre of gravitylocated as close to centre of the handle as possible(Figure 1).• The tool should be comfortable to hold and use inthe typical positions for which it is designed, eliminatingas much stress as possible for end user.• An auxiliary handle providing additional placementfor a second hand must be designed into tools thatare too heavy so they can be supported properly.A drill that is too nose-heavy or unbalanced willrequire more effort to use and put higher stresses on thewrist and forearm. A reciprocating saw, for example, isdesigned—and must always be used—with two handsand/or an auxiliary handle.HandlesThe handle on a well-designed power tool should be comfortableto hold when your hand is in a neutral or natural position(i.e. where the wrist does not bend up, down or sideways).DAN RODRIGUEZ<strong>Electrical</strong> Contractor• A handle must be completely smooth and free of sharp edges,especially around the trigger and other secondary actuationcontrols.• The best handles should also accommodate a rubber grip areaspecifically where the hand will rest and be in contact with thecontrols. This helps minimize stress and provides a secure gripin varying temperatures.“PULLS SO EASY,MY DAUGHTERCOULD DO IT.”With our exclusiveSIM Jacket ,NEW ROMEX ® SIMpull pulls 50% easier.It’s true ROMEX ® SIMpull pulls 50% easier thanother NM90 on the market — without greasyresidue and without raising costs. It’s all becauseof Southwire’s uniquely designed patent pendingSIM Jacket. No other NM90 has the SIM Jackettechnology, so no other NM90 pulls this easy. Infact, at its NECA 2004 debut, itstopped the show. Thanks toROMEX ® SIMpull. , you can nowdemand and expect quality from anNM90 product. Nothing pulls easierthan ROMEX ® SIMpull. Ask for it by name.To learn more, call 888.770.5155 or go towww.romexsimpull.com.pulls fasterreduced burn-thruContinued on page 11strips easiertear resistantFIGURE 1Romex ® Brand • EZ-MC ARMORLITE ® • EZ-AC ARMORLITE ®ALFLEX ® • ULTRATITE ® • ResistAll • AlumaFlex SOLONON • StrikeShield • ARMOR-X ® • ARMOR-Xtra • SureSeal ®INFO NO. 8www.mag.com • JANUARY 2005 • 9

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