| 摘要 |
A bed assembly 10 comprising a mattress 11 having a head end 12, a thigh region 13 and a foot region 14, the thigh region is shown in its inclined position with the foot portion shown in a raised horizontal position. 5 The bed assembly includes a frame assembly 15 having a base frame 16 with legs 17, 18 and 19 (it being appreciated that additional legs are provided across the frame) and a sub-frame 20 set on rollers 21 and 22 so that this may move marginally along the guide 23 as the foot end is raised or lowered so that it effectively joggles back and forwards on the main bed frame 16. 10 The thigh and foot portions include support platters at 24 and 25 respectively with a linkage arrangement having bilateral links 26 and 27 driven together by a central hydraulic cylinder assembly at 28 with a central crank arm 29 disposed about a rotatable beam 30 coupled to the links 26 and 27. The retraction of the piston 31 and the crank serves to keep the piston under load 15 and thereby retain the thigh and foot sections in the position illustrated in Figure 1 in concert with operation of the links and the bilateral connecting arms 32. The connecting arms 32 have stubs 33 adapted to travel a short distance, about 25mm-50mm in slot 34 before the leg and thigh portion are raised. This slightly alters the direction of the applied force so that the central coupling between the 20 links is first raised. |
