ergo21_controls - Safety and Ergonomics Spring 2010/ 2011 1...

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Unformatted text preview: Safety and Ergonomics Spring 2010/ 2011 1 Safety and Ergonomics Controls Spring 2010/ 2011 2 Controls definitions ¡ Activators (ISO Standards) ¡ Transmit input to a piece of equipment ¢ Operated by: Hand, Foot ¡ The interface between person and machine ¡ Transfers mechanical energy or information for functions to be performed ¡ Provides the touch and feel of the system Spring 2010/ 2011 3 Controls ¡ Activate or shutdown equipment ¡ Make a discrete setting; ¢ selecting a channel, entering data via keyboard ¡ Make a quantitative settings ¢ Thermostat temperature ¡ Apply continuous control ¢ steering Spring 2010/ 2011 4 Controls selection ¡ The type of control shall be compatible with stereotypical, expectations ¢ To turn a light Æ push button or toggle witch, not rotary knob ¡ Controls size and motion characteristics shall be compatible with experience ¢ fairly large steering wheel, not small rotary control in automobiles ¡ The direction of operation of a control shall be compatible with expectations ¢ on control Æ pushed or pulled ¡ Compatibility of control machine movement ¢ Controls direction movement Æ compatible with the response movement of the controlled machine Safety and Ergonomics Spring 2010/ 2011 2 Spring 2010/ 2011 5 Controls selection Spring 2010/ 2011 6 Controls selection Spring 2010/ 2011 7 Controls selection ¡ The control shall be safe ¢ It will not be operated inadvertently, in false or excessive ways ¡ Operations requiring fine control and small forces shall be done with hands, while gross adjustments and large force are usually exerted with the feet. ¡ Control actuation force or torque ¢ The force or torque applied by an operator to actuate a control shall be kept as low as possible, particularly if the control is operated often. ¢ If jerks or vibrations arise, it is usually better to stabilize the operator than to increase the resistance of the control in order to prevent uncontrolled or inadvertent activation....
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ergo21_controls - Safety and Ergonomics Spring 2010/ 2011 1...

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