Documents seats 7 results

"This study developed anthropometric information on U.S. firefighters to guide fire-apparatus seat and seatbelt designs and future standards development. A stratified sample of 863 male and 88 female firefighters across the U.S. participated in the study. The study results suggested 498 mm in width, 404 mm in depth, and 365–476 mm in height for seat pans; 429–522 mm in width and 542 mm in height for seat back; 871 mm in height for head support; a seat space of 733 mm at shoulder and 678 mm at hip; and a knee/leg clearance of 909 mm in fire truck cab. Also, 1520 mm of lap belt web effective length and 2828 mm of lap-and-shoulder belt web effective length were suggested. These data for fire-truck seats and seatbelts provide a foundation for fire apparatus manufacturers and standards committees to improve firefighter seat designs and seatbelt usage compliance."

"The seat vibration of nine tractors was investigated while harrowing was being performed. In all cases, the average vibration of the seat exceeded the 8h "fatigue-decreased proficiency boundary" specified in the international standard ISO 2631/1. The instantaneous accelerations of the most harmful one-third octave band of vibration were sometimes two- to threefold compared with the average. More technical development is needed to reduce seat vibration to a safe level. Topics: agricultural operations; back disorders; backache; drivers; tractors; vibration acceleration; vibration measurement; whole-body vibration."

"Exposure to whole-body vibration (WBV) has been associated with a wide variety of health disorders. While previous work has established that forest machine operators are exposed to high levels of translational WBV, there are no reports which have quantified field levels of rotational vibration; therefore, the purpose of this work was to quantify six degree of freedom (6-DOF) accelerations that forest machine operators are exposed to during routine machine operations as well as to assess potential health risks and determine the effect of various measurement locations (chassis, seat/operator interface (SOI)), driving conditions (driving loaded (DL), driving unloaded (DUL)) and axis (X, Y, Z and roll, pitch, yaw). Simultaneous measures of 6-DOF acceleration from both the SOI and chassis were determined for seven skidders operating in Northern Ontario boreal forest conditions during the months of June and July 2006. Average running root mean squared (RMS) ISO 2631-1:1997 weighted accelerations were between 0.72 and 1.12 m/s2 and 0.33 and 0.79 rad/s2 at the SOI in the translational and rotational axes, respectively. The dominant frequency and the SOI and chassis was determined to be 1 Hz at both at the chassis and SOI while DL and DUL in the X- and Y-axes, and 2 Hz in Z-axis. The acceleration data indicate an uncomfortable/very uncomfortable ride for skidder operators. The acceleration skidder operators are exposed to exceed the upper exposure limit for a 4-h work day as outlined in ISO 2631-1:1997, and are thus likely to incur some health effects. ANOVA procedures revealed significant (pless-than-or-equals, slant0.05) differences between weighted RMS accelerations at the dominant frequency and running weighted RMS accelerations for driving condition (DUL>DL), measurement location (SOI >chassis) and axis (Y>X>Z and roll>pitch>yaw). To our knowledge, this data represents the most comprehensive 6-DOF field data set collected and analyzed to date for any type of forestry vehicle. The results of this study indicate that skidder seats amplify the WBV accelerations occurring at the SOI when compared to corresponding values measured at the chassis. The acceleration values outlined in this study are similar to those published over the past 20 years suggesting that little has changed with respect to the ability of the seat to attenuate harmful vibration and/or the ability and/or willingness of the operator to adjust the seat in order to optimize seat effectiveness."

"Guidance on how to ensure the safety and suitability of workplace seating. Addressed to those responsible for health and safety at work and useful for employees, manufacturers, designers, suppliers and users of industrial and office furniture. Includes good practice workplace examples (featuring checklists and easy-glance workstation diagrams). Aspects of seating design and upholstery are explored. The advice covers the range of typical workplace seating requirements such as disability needs, foldaway chairs, gas lift technology, sliding, wheeled, suspended or tilted mechanisms. Specifics such as VDU/keyboard or checkout seating are also covered.