Industrial Design

A Short Course in Industrial Design by Eskild Tjalve

By Eskild Tjalve

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T h e d i f f e r e n c e b e t w e e n t h e t w o t y p e s illus­ t r a t e d consists i n t h e d i f f e r e n t spacial a r r a n g e m e n t o f t h e m a t e r i a l c o n n e c t i n g t h e f u n c t i o n a l surfaces. We c a n t h e r e f o r e i d e n t i f y t w o steps in t h e design o f an e l e m e n t , o n t h e o n e h a n d d e t e r m i n i n g t h e f u n c t i o n a l surfaces a n d , o n t h e o t h e r , d e c i d i n g h o w these w i l l be c o n n e c t e d t o g e t h e r .

NUMBER FORM Figure GEOMETRY with the later s e c t i o n o n t h e f o r m variation ARRANGEMENT DIMENSIONS 45 Examples of variation of internal functional surfaces based on tfie four variation parameters. Tfie examples sfiown are — a hinge, overhead projector, a socket for a camera lens and a socket for an electric light bulb 53 NUMBER ARRANGEMENT FORM DIMENSIONS Figure 46 GEOMETRY Examples of variation of external functional surfaces based on the four variation parameters. - a wheel for a chair, an electric drill, a hotplate andan electric switch The examples are 54 STARTING P O I N T : Lid w i t h p a c k i n g FUNCTIONAL SURFACES Variation parameters : - Number -Arrangement -Dimension - Form geometry NUMBER ARRANGEMENT 1= Figure 47 Variation of functional surfaces for a lid with ¿= =ÍB packing - number, arrangement Methods used in form design 55 In t h e f o l l o w i n g paragraphs i t w i l l be s h o w n h o w T h e v a r i a t i o n p a r a m e t e r s m a y g e n e r a l l y be f r e e l y v a r i a t i o n o f t h e f u n c t i o n a l surfaces m a y be a p p l i e d v a r i e d inside t h e l i m i t s w h e r e t h e f u n c t i o n a l surfaces in a p a r t i c u l a r p r o b l e m .

E x a m i n a t i o n o f t h e p r o b l e m o n t h e basis o f v a r y i n g A s an o v e r a l l c h e c k o n t h e l i m i t s i t m a y be u s e f u l t h e f o u r v a r i a t i o n p a r a m e t e r s m a y , f o r i n s t a n c e , give t o e x a m i n e t h e f u n c t i o n a l surfaces w i t h t h e greatest t h e suggestions s h o w n in Figures 4 7 a n d 4 8 . These e x t e n t a n d t h o s e w i t h t h e smallest e x t e n t . S u c h sur­ m u s t n o t be regarded as f i n a l suggestions, b u t o n l y faces m a y be s u i t a b l y c a l l e d m a x i m u m a n d m i n i m u m as categories o f s o l u t i o n s , as each o f t h e suggestions surfaces, see F i g u r e 4 9 .

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