Spring unit

Details Spring unit Spring unit

A - Human Necessities

47

C

360/18

A47C 25/00 (2006.01) A47C 23/053 (2006.01)

Patent

CA 1196736

- 15 - Abstract of the Disclosure A plurality of main springs and a plurality of intermediate support springs are arranged on a rectantular base pale. Each main spring is made of a single steel wire and consists of two coil portions and a straight rod portion connecting these two coil portions. The rod portions of the main springs are arranted at right angles, thus forming a lattice. One end of each coil portion is fastened to a frame. The other end of each coil portion is fastened to the base plate. Each coil portion is shaped like cylinder, a cone, an inverted cone, a hourglass or a barrel.

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