| 摘要 |
A variable configuration and volume chamber which, in its most basic form, consists of a plurality of first substantially rigid panels the marginal edges of which form a substantially rectilinear acute triangle and a plurality of second substantially rigid panels, the marginal edges of which form a substantially rectilinear obtuse triangle. The chamber is formed by hinge-joining marginal edges of respective panels in a particular arrangement such that the jointure of the second rectilinear obtuse triangle panels together with the obtuse vertices of the joined second panels intersect at the longitudinal axis of the chamber whereby rectilinear movement of the intersection is maintained in a plane of symmetry of the chamber throughout actuation of the chamber.
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