Appeal No. 2004-1244
Application 10/085,280
therein (claim 1), and (3) the spiral groove to comprise a
helical groove (claim 4). In this regard, Beusch does not teach
that the cooling jacket inner wall member 6, which effectively
constitutes an evaporator body, has a spiral or helical groove on
its outer cylindrical surface, or that the cooling jacket outer
housing wall 7, which effectively constitutes an evaporator
jacket, is in interference fit with any part of the evaporator
body.
Kaiser discloses a soft-serve frozen dessert machine 10
which is similar to the ice making apparatus disclosed by Beusch
in that it includes a cylindrical freezing chamber 32 for
receiving and freezing on its inner surface a liquid dessert mix
and a rotating dasher 132 within the freezing chamber for
scraping the frozen dessert from the inner surface and advancing
it toward a dispensing means. Of particular interest is the
construction of the freezing chamber:
[t]he freezer 32 is made up of a member 84, which has a
substantially cylindrical inner surface 86 and a spiral
groove in its outer surface 88. The member 84 is
preferably cast, although it could be machined or made
by other known methods. A tube 89 is shrunk over the
outer surface 88 of the member 84 to create a spiral
passageway for the refrigerant. This is accomplished
by first heating the tube 89 so that it expands and
then slipping the expanded tube over the member 84 from
back to front until it reaches the front flange 91 of
the casting 84. Then, when the tube 89 cools, it
shrinks around the casting 84 so that the refrigerant
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