H-POINT AND R-POINT

Following the decision to focus our designs around the chair and wheelchair restraining system. We have begun to research H-Point and R-Point. 

"In vehicle design and especially automotive design, the H-point (or hip-point) is the theoretical, relative location of an occupant's hip, specifically the pivot point between the torso and upper leg portions of the body, either relative to the floor of the vehicle or relative to the height above pavement level—and pertinent to seating comfort, visibility from the vehicle into traffic and other design factors. Technically, the measurement uses the hip joint of a 50th percentile male occupant, viewed laterally.

For the purpose of U.S. regulation and GTR's(Global Technical Regulations) — and for clear communication in safety and seating design — the H-point is defined as the actual hip point of the seated crash test dummy itself, whereas the R-point (or SgRP, seating reference point) is the theoretical hip point used by manufacturers when designing a vehicle — and more specifically describes the relative location of the seated dummy's hip point, when the seat is set in the rearmost and lowermost seating position."