The reduction in weight is always a constant objective of all modern designers for emergency protection. Thanks to the Spencer Space Frame, for example, the Spencer 420 heart patient chair has an empty mass of just 10.5 kg [23 lbs]. The advantage is obvious: a lighter and more usable chair. Simplicity, posture and the patient's comfort is combined with the lightness of the Weld Series. The most interesting novelty regards the closure system of the chair, defined as sleighing or sliding. The seat slides onto the chassis of the frame making the dimensions of the whole apparatus contained, but when required more than adequate for any functional needs. Weld Series chairs are characterised by the soldered frame, the choice of the shiny or varnished superficial treatment with epoxy powders and by the option of high backrest to guarantee patient stability and maximum comfort even going up and down hill.