Improved Apparatus for Grating Bread and similar substances.
Year: 1892

page_text: Date of Application, 2nd Mar., 1892-Accepted, 9th Apr., 1892
COMPLETE SPECIFICATION.
Improved Apparatus for Grating Bread and similar substances.
1, GEORGE JAMES BAKER, of 47, Featherstone Street, in the Borough of
Finsbury, Tinplate Worker, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
My invention relates to improved apparatus for grating bread and similar
substances, and it has for its object to provide a simple and efficient apparatus.
whereby pieces of bread of various sizes may be entirely and quickly reduced.
to crumbs of approximately uniform grade as required for various culinary
purposes.
The apparatus is illustrated in the accompanying drawings, forming part of this
Specification, and will be described with reference thereto.
Figure 1 being a central vertical sectional elevation, and Figure 2 a part
sectional plan, of the grater.
Figure 3 is a detail view.
The apparatus consists essentially in the combination of an inner revolving
cylindrical grater A with an outer stationary conical grater B terminating at its
lower end in a cylindrical grater B', closely surrounding the inner grater A, the
distance between the parallel cylindrical surfaces of A and B determining the
fineness of grade of the product. The grater B is enclosed within an outer
casing C and the inner revolving grater A is mounted to rotate within it upon a
central vertical spindle a supported in bearings in crossbars a' a² fixed across the
upper and lower ends of the grater B B and rotated by a winch-handle applied to.
the upper end of the spindle. The cylinder A is hollow closed at top by a cone
and open at bottom to permit the particles which may pass through the punctures.
in its circumference to fall to the bottom of the casing C in which are also received
the particles which pass through the punctures in the outer grater B B. Both
graters are made of tin-plate and the grating surface (represented in Figures 1 and 2
by cross hatching) is formed by puncturing and punching up the metal in the form
of jagged points (as shown in Figure 3) by means of a punching machine, as in
making nutmeg and other graters, the jagged surfaces of the inner and outer
graters being presented towards each other and together constituting a two-fold
or double-acting grater. Pieces of bread of any size or shape, placed in the
tapering space between the inner cylindrical and outer conical graters become.
quickly comminuted and reduced in passing between the parallel surfaces A and B¹
(which are also furnished with jagged points) to a uniform grade of fineness. The
outer grater B is held in position by being soldered into a corresponding aperture
formed in the top of the casing C and the latter is provided with a hinged door C¹
at which the grated product collected in the easing is discharged.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
The herein-described bread-grater, consisting essentially in the combination of
a cylindrical grater mounted to revolve on a vertical axis within an outer stationary

page_text: conical grater terminating at its lower end in a cylindrical grating surface closely
surrounding the inner grater, substantially as specified.
Dated this 2nd day of March 1892.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.