✦ LIBER ✦

How does a backrest work?

✍ Scribed by E.N. Corlett; J.A.E. Eklund

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 308 KB
Volume: 15
Category: Article
ISSN: 0003-6870
DOI: 10.1016/0003-6870(84)90282-5

No coin nor oath required. For personal study only.

✦ Synopsis

After discussing the distribution of forces in the stable upright posture and illustrating the importance of the lumbar lordosis for minimising muscular effort in this position, the Ioadings on the spine and active muscles of the back are outlined during upright sitting. It is shown that the backrest locates the lumbar spine so that the CG of the superincumbent body parts can be positioned above the vertebrae, permitting the gravity load to be transmitted to the seat without the counteracting torques which muscles would have to provide if this position was not adopted. The forces arising from other sitting positions are then discussed, and some conclusions drawn for seat design.

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