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3 , 1 4 5 , 1 7 4h o r i z o n t a l s u r f a c e a t t h e mouth o f t h e h e a v y d i s c h a r g ep a s s a g e . T h i s c o l l e c t i o n h a s b e e n n o t i c e a b l e e s p e c i a l l ya f t e r i n t e r r u p t i o n o f f e e d t o t h e p r i o r a r t machines a swhen s w i t c h i n g from one s t i r r i n g v a t t o a n o t h e r . A f t e rs u c h i n t e r r u p t i o n a d d i t i o n a l s o l i d s h a v e b u i l t up on t h o s e a l r e a d y i m p a c t e d a n d h a v e c o m p l e t e l y p l u g g e d t h e m o u t ho f t h e h e a v y d i s c h a r g e p a s s a g e r e q u i r i n g s h u t d o w n a n dd i s a s s e m b l y o f t h e a p p a r a t u s f o r c l e a n i n g .W i t h t h e a p p a r a t u s e m b o d y i n g t h e p r e s e n t i n v e n t i o nt h e r e h a s b e e n no s u c h p l u g g i n g a f t e r i n t e r r u p t i o n o ft h e f e e d . C o n t i n u o u s o p e r a t i o n h a s b e e n a c h i e v e d .E x a c t l y h o w t h e p r e s e n t i n v e n t i o n o p e r a t e s t o e l i m in a t e p l u g g i n g i s n o t known. I t i s b e l i e v e d , h o w e v e r , t h a tt h e s l i g h t l y i n c l i n e d z o n e 5 4 i n d r a w i n g t h e u p w a r d l ym o v i n g l i q u i d i n w a r d h a s c a u s e d movement o f t h e l i q u i da d j a c e n t t h e s u r f a c e i n t h e z o n e 54 i n a d v a n c e o f t h es u r f a c e by r e a s o n o f t h e a n g u l a r m o m e n t u m o r i n e r t i a o ft h e l i q u i d d u e t o i t s s p e e d a t t h e l o w e s t p o i n t i n t h ez o n e . T h i s advance m o v e me n t h a s a c h i e v e d a sweepinga c t i o n o f t h e i n c l i n e s u r f a c e 5 4 a n d h a s p r e c l u d e d b u i l dup o f s o l i d p a r t i c l e s t h e r e a l o n g up t o t h e downwardlyf a c i n g h o r i z o n t a l s u r f a c e 5 2 .Whatever t h e a c t i o n o f m a t e r i a l i n t h e r o t o r , i t s h o u l dbe n o t e d t h a t I have a c c o m p l i s h e d t h e c u r e o f a c o n d it i o n which h a s f o r m a n y y e a r s been a problem i n t h ec e n t r i f u g a l s e p a r a t i o n o f a c h e e s e ? u i d from whey a n dh e a v y s o l i d s ; n a m e l y t h e r e q u i r e m e n t d u e t o h e a v y d i sc h a r g e b l o c k a g e o f f r e q u e n t s h u t d o w n s f o r c l e a n i n g p u rp o s e s .I t s h o u l d be u n d e r s t o o d t h a t v a r i a t i o n s o f t h e apparat u s shown a r e p o s s i b l e w i t h i n t h e s c o p e o f t h e i n v e n t i o n .The d i v i s i o n b e t w e e n t h e s h e l l 1 2 and t h e t o p e l e m e n t14 need not be between zone 54 and s u r f a c e 5 2 .

S i n c e t h i s i n v e n t i o n w a s conceived and p e r f e c t e d i nconnection with the separation of a cheese ?uid f r o mwhey and h e a v y s o l i d s i n a f e e d m i x t u r e , i t h a s b e e n d es c r i b e d i n t h i s u s e . H o we ve r i t s h o u l d b e u n d e r s t o o dt h a t t h e r o t o r embodying t h e i n v e n t i o n i s u s e f u l i n anys e p a r a t i o n i n which t h e r e i s a t e n d e n c y f o r t h e h e a v yd i s c h a r g e t o p l u g a t t h e a b r u p t i n t e r s e c t i o n o f t h e v e r t i c a lW a l l a n d t h e h e a v y d i s c h a r g e p as s a g e .A e a s o n a b l e v a r i a t i o n o f t h e u n i f o r m l y t a p e r e d z o n e54 i s a zone o f s i m i l a r l e n g t h t a p e r e d i n a concave a r c ,t h e c h o r d s u b t e n d i n g t h e a r e h a v i n g t h e p r e s c r i b e d ang l e w i t h t h e v e r t i c a l s u r f a c e . The u n i f o r m t a p e r i s t h ep r e f e r r e d e m b o d i m e n t h o w e v e r .I t i s t h e r e f o r e t o b e u n d e r s t o o d t h a t t h e above p a rt i c u l a r d e s c r i p t i o n i s by w ay i f i l l u s t r a t i o n and n o t o fl i m i t a t i o n , a n d t h a t c h a n g e s , o m i s s i o n s , a d d i t i o n s , s u bs t i t u t i o n s a n d / o r o t h e r m o d i ? c a t i o n s m a y b e m a d e w i t ho u t d e p a r t i n g from t h e s p i r i t o f t h e i n v e n t i o n . Accordi n g l y i t i s i n t e n d e d t h a t t h e p a t e n t s h a l l c o v e r , by s u i t a b l ee x p r e s s i o n i n t h e c l a i m s , t h e v a r i o u s f e a t u r e s o f p a t e n ta b l e n o v e l t y t h a t r e s i d e i n t h e i n v e n t i o n .I c l a i m :1 . A c e n t r i f u g e a d a p t e d e s p e c i a l l y f o r s e p a r a t i n g ac h e e s e f l u i d from Whey and h e a v y s o l i d s i n a f e e d mixt u r e w h i l e a vo i d i n g p l u g g a g e i n t h e whey a n d h e a v y s o l i d sd i s c h a r g e c o m p r i s i n g( a ) a r o t o r i n c l u d i n g a g e n e r a l l y c u p - s h a p e d i m p e r f o

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A .t i o n a n d a g e n e r a l l y f r u s t o- c o n i c al t o p e l e m e n t h a vi n g a h o r i z o n t a l a n n u l a r u n d e r s u r f a c e and mountedon t h e s h e l l , t h e s h e l l and t h e t o p p a r t l y d e ? n i n g ap r i m a r y s e p a r a t i n g c h a m b e r ,( [ 9 ) means f o r r o t a t i n g t h e r o t o r a b o u t a n a x i s ,

( 0 ) means f o r f e e d i n g t h e m i x t u r e i n t o t h e r o t o r ,( d ) a d i s c s t a c k d i s p o s e d w i t h i n t h e p r i m a r y s e p a r a ti n g c h a m b e r ,( e ) a f r u s t o - c o n i c a l d i v i d i n g c o n e s u p p o r t e d by a i d d i s c

s t a c k and s p a c e d under t h e t o p e l e m e n t t o de?ne ar e l a t i v e l y a b r u p t l y a n g l e d h e a v y d i s c h a r g e p a s s a g eb e t w e e n t h e t o p e l e m e n t and t h e d i v i d i n g c o n e ,

( f ) r a d i a l v a n e s w i t h i n t h e d i s c s t a c k , t h e v a n e s e x t e n d i n g f r o m t h e l o w e r e n d o f t h e p r i m a r y s e p a r a t i n gchamber t o a l e v e l below t h e t o p o f t h e p r i m a r ys e p a r a t i n g c h a m b e r a n d a d a p t e d t o h e l p a c c e l e r a t et h e f e e d i n t h e r o t o r t o t h e v e l o c i t y o f t h e r o t o r ,

( g ) a l o n g a n n u l a r s l i g h t l y t a p e r e d z o n e on t h e i n s i d es u r f a c e o f t h e s h e l l , t h e z o n e e x t e n d i n g from immed i a t e l y a d j a c e n t t h e v e r t i c a l p o r t i o n a n d a p p r o x im a t e l y t h e m i d p o i n t l e v e l i n t h e p r i m a r y s e p a r a t i n gchamber o f t h e r o t o r c o n t i n u a l l y upward t o t h eh o r i z o n t a l a n n u l a r u n d e r s u r f a c e o f t h e t o p e l e m e n ta n d d i s p o s e d e n t i r e l y r a d i a l l y o u t w a r d o f t h e d i s cs t a c k , t h e s h e l l d i a m e t e r i n t h e zone d e c r e a s i n g a st h e u p p e r e n d o f t h e s h e l l i s a p p r o a c h e d ,w h e r e b y t h e w h e y p o r t i o n s a n d h e a v y s o l i d s a d j a c e n t t h e

i n s i d e s u r f a c e o f t h e r o t o r i n moving upward i n t h echamber t o w a r d t h e h e a v y d i s c h a r g e p a s s a g e a r e g u i d e dg r a d u a l l y i n w a r d o f t h e r o t o r by t h e t a p e r e d z o n e , a n da r e t h e r e b y c a u s e d t o m o v e t a n g e n t i a l l y f a s t e r t h a n t h ea d j a c e n t s u r f a c e .2 . The c e n t r i f u g e a s d e s c r i b e d i n c l a i m 1 w h e r e i n t h es u r f a c e o f t h e s l i g h t l y t a p e r e d zone has a g e n e r a t r i x o fa l i n e i n t e r s e c t i n g the a x i s a t a n angle of about 4 . 5 .

R e f e r e n c e s C i t e d i n t h e ? l e o f t h i s p a t e n tUNITED S T A T E S PATENTS504,809 L i s t e r e t a l ____________ __ S e p t . 1 2 , 1893960,768 Anderson ____________ _ June 7 , 1910

1,120,464 F a l k ________________ __ D e c. 8 , 19141,662,199 McCornack __________ __ Mar. 1 3 , 19281,749,291 L i ndg ren ____________ __ Mar. 4 , 19302,139,715 Bergner ____________ __ Dec. 1 3 , 19382,387,276 L i n k ________________ _ Oct. 23, 19452,432,829 Strezynski __________ __ Dec. 1 6 , 19472,461,129 Strezynski ____________ __ Feb. 8 , 19493,047,214 Downing ____________ __ July 3 1 , 19623,109,839 Keith _______________ __ N o v . 5 , 19633,119,775 Wilsmann e t a 1 ________ __ Jan. 2 8 , 1964

FOREIGN PATENTS14,574 Sweden _____________ __ Aug. 1 6 , 1902

704,357 F r a n c e ______________ _ Feb. 23, 1931747,329 Great B r i t a i n _________ __ Apr. 4 , 1956

OTHER REFERENCESGerman p r i n t e d a p p l i c a t i o n 1 , 0 6 3 , 5 3 3 , A u g . 1 3 , 1 9 5 9 .