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Патент USA US2121462

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2,121,462
Patented-June 21, 1938 -
UNITED STATES‘ PATENT OFFICE‘
2,121,462
CONVEYER SCREW
Arthur Winterlich, Dresden, Germany
‘Application June 2'7, 1936, Serial No. 87,696
In Germany July 3, 1935
4 Claims. (Cl. 198-213)
As pointed out above, in operation, the helical
This invention relates to conveyer screws, par
ticularly for apparatus for the hot treatment of
chocolate masses, comprising a helical member
which is itself coreless, rotating in the gap be
1,1 i tween a stationary casing and a stationary core
with which it makes a close ?t. In contrast with
known conveyer screws of this type in which the
central longitudinal section of the helical mem
ber is rectangular or square, according to‘ the
invention the frictional resistance to the opera
tion of the screw and the power consumption re
quired are reduced by reason that the central
longitudinal section of the helical member is
except for the leading portion, which is rectangu
' lar, that of a trapezium the shorter sides of
which are normal to the casing and the core and
the longer sides of which converge rearwardly.
With such a construction only the leading short
side of the trapezium and the curved areas of
the leading portion extend close to the casing
and the core, while the outer and inner sides of
the trapezium are inclined away therefrom, so
that without substantial diminution of the cross
sectional area the friction is considerably re
duced. This reduction of friction is the more
important in' that even a helical member of
powerful construction which is not stiffened by
a core tends to be compressed ‘axially, with
simultaneous increase of its diameter, by the
30 pressure due to the resistance offered by the
mass to be conveyed, particularly in the case of
a‘ conveyer comprising a large number of con
I 5
volutions, as the result of which the frictionlbe
tween the helical member and the casing wall is
materially increased. This drawback heretofore
experienced with coreless conveyer screws is now
compensated for by the cross-sectional form of
the helical member according to the invention.
This invention will be understood from the ac
companying drawing in which the ?gure shows
in central longitudinal section the construction
according to ‘the invention, a portion of the sta—
tionary core’ being broken away to show a portion
of the helical member.
45
,
The numeral I denotes the stationary casing,
2 the stationary core, and 4 the helical conveyer
member according to the present invention.
member 4 is rotated by any suitable means (not
shown) between the stationary casing l and the
‘stationary core 2, the direction of rotation being
such as to force the material being conveyed,
which may be speci?cally a chocolate mass, in the
direction of the arrows shown in the drawing.
In the ?gure, in the interest of simplicity, the
casing wall and the stationary core are shown as
being of tubular form.
What I claim is:
'
10
-
1. In apparatus of the character described, an
o'uter casing, a core, and a helical conveyer mem
ber adapted to rotate with respect to said casing
and said core, the leading portion of said con
veyer being adapted to span the space between
said casing and said core, and the'remainder of
said conveyer being spaced from said casing.
2. In apparatus of the character described, an
outer casing, a core, and a helical conveyer mem- =
ber adapted to rotate with respect to said casing
and said core, the leading portion of said con
veyer being adapted to span the space between
said casing and said core, and the remainder of
said conveyer being spaced from said core.
3. In apparatus of the character described, an
outer casing, a core, and a helical conveyer mem
ber adapted to‘ rotate with respect to said casing
and said core, the leading portion of said con- ‘
veyer being adapted to span the space between 30
said-casing and said core, and the remainder of
said conveyer being spaced from said casing and
said core.
'
4. In apparatus of the character described, an'
outer casing, a core, and a helical conveyer mem
35
ber adapted to rotate with respect to said casing
and said core, the leading portion of said con
veyer being adapted to span the space between
said casing and said core, the normal section of
said conveyer being a ‘rectangle having two rela- ‘
tively short opposed sides in contact with said
casing and said core, said rectangle on its rear
relatively longer face merging into a trapezoid
having a rear edge approximately normal to said
casing and said core, and said rear edge being 45
shorter than the edge merged into said rectangle.
'
-
ARTHUR WINTERLICH.
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