SITE MAP | DISCLAIMER     EMAIL:  info@thomasengineers.co.nz   PHONE: + 64  9  9485793                   HOME SERVICES ENGINEERED SOLUTIONS CASE STUDIES CONTACT US A- SEATBELT   |  B- CRANE   |  C- WHEELBASE   |  D- EVALUATION    |  E- SEAT BASE   |   F- CONVEYING  |  G- PROCESS  |  H- TESTING Case Study A : Seat-belt Anchorage Installation (With Vehicle Certification - LT400)  The retro-fitting of this seat-belt anchorage frame, into the rear of a fire appliance, required the removal of the seat framing in order to verify the configuration of the wall and floor structure available to provide suitable securing points for the anchorage frame. LT400 certification was required for the vehicle to be approved for use on roads in New Zealand. (Done by heavy Vehicle Certifier).   SEAT BELT FRAME INSTALLATION INTO A FIRE ENGINE Limited space around the seat-frame and between the seat-frame and rear wall meant that the placement and sizing of frame members was critical. Careful attention is required to establish which members are in tension or in compression and which securing points are in shear, tension, compression or a combination of these. Very important is also to ensure that the seat-belt itself, once fitted, passes comfortably and correctly over the occupant’s shoulder. Framing is generally required in a retro-fit situation since there is generally no suitable structure available in order to place seat-belt or child-restraint anchorages in the correct positions relative to the occupant. This is evaluated before each project.   Loads at securing points for anchorage frames can often reach momentary peaks as high as 4000kg or more depending on geometries of the framing. Physical testing or engineering evalaution of seat frames provides the ideal and most effective solution for seat or seat-belt anchorage frame design since hand calculations generally result in frames that are much stronger than they need to be and consequently are too rigid. Too much rigidity detracts from the ability of the frame to absorb energy during impact and is likely to result in greater injury of the occupant.   If you have any special requirements for stressed seat or  seat-belt anchorage frame design please contact Thomas Engineers Limited.   Applications include:   Swivel-bases for stressed seats in motor-homes. Window bars for small coaches, taxis or motor-homes. Pillar and frame design for any motor-home seating arrangements.     home | services | engineering nz | case studies | contact us | links | site map | disclaimer                                                                         BACK TO TOP Disclaimer : Every effort has been made to ensure that details on this web-site are correct, no item or detail  on this web-site should be used or implemented for any purpose without first consulting THOMAS Engineers Ltd to discuss the application. All items are copyright. Copyright © 2009 Thomas Engineers Limited. All rights reserved.