| 摘要 |
The seat back 12<SB>2</SB>, seat 12<SB>1</SB> and footrest 12<SB>3</SB> of a (wheel) chair are brought into substantially vertical alignment (Figs 5,6) by a mechanism comprising a seat-supporting parallelogram linkage 17 having upper and lower bars 18,19 and pivoted to the chassis 2 at a front plane P<SB>1</SB>; a footrest-supporting parallelogram linkage 53 including sides 54,55 and linking the chassis to the seat-supporting assembly, and a back frame 12<SB>2</SB> pivoted via a triangulating strut 34 to the rear of the assembly 17. The seat is moved between sitting and upright positions by a lever 42 pivoted at 43 to the top bar 18 and (at 44, Fig 1) to a rod 45 which is pivoted (at 46, Fig 1) to the chassis. The assembly 53 is located behind the plane P<SB>1</SB> and linked to the assembly 17 by a reversible actuating and coupling rod 61 located behind plane P<SB>1</SB> and beneath the plane of the seat in its sitting configuration. A weight compensating and energy absorbing resilient strut 38 is provided between the top bar 18 and the chassis. |
