An Improved Machine for Grating or Rasping Potatoes and other Materials.
Year: 1893

page_text: Date of Application, 15th Nov., 1893
Complete Specification Left, 1st Aug., 1894-Accepted, 15th Sept., 1894
PROVISIONAL SPECIFICATION.
An Improved Machine for Grating or Rasping Potatoes and other
Materials.
I, OSCAR BAUER of Felixstrasse No. 1 Leipzig-Anger in the Empire of
Germany, Master Brazier, do hereby declare the nature of this invention to be as
follows
The objects of this invention are to provide an apparatus or machine for the
grating or rasping of potatoes, bread, cheese, or any other materials in which the
material grated needs no special mechanical appliance other than the rasps for
pressing it against the latter, and in which the parts are easily removable for
cleaning.
The machine consists of a suitable case or frame with a hopper or guide above
for reception of the material to be grated, a body part for housing two rotary
rasping drums and tray or chute below for the grated material. It is provided
with a clamp or other means for fixing. The drums are caused to turn together
but in opposite directions by toothed gearing when one of them is revolved by a
hand crank on its shaft. The material resting above between the drums is pressed
by each drum towards the surface of the other by the action of the rasp teeth
when the drums are revolved and is thus subjected to a regular rasping.
To enable the drums to be withdrawn for cleaning, the gear wheels and crank
handle are fixed on hollow shafts revolving in bearings in the case or frame, and the
drums are provided with projecting shafts which will pass into the aforesaid hollow
shafts and may be secured by set screws; on loosening these screws the drums may
be drawn out freely at the other end of the case without disturbance of the toothed
gearing or crank handle.
Dated this 15th day of November 1893.
R. HADDAN,
Agent for Applicant.
COMPLETE SPECIFICATION.
An Improved Machine for Grating or Rasping Potatoes and other
Materials.
I OSCAR BAUER of Felixstrasse No. 1 of Leipzig-Anger in the Empire of
Germany, Master Brazier, 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:-
The objects of this invention are to provide an apparatus or machine for the
grating or rasping of potatoes, bread, cheese or any other materials, in which
the material grated needs no special mechanical appliance other than the rasps
for pressing it against the latter, and in which the parts are easily removable
for cleaning.
The machine consists of a suitable case or frame with a hopper or guide above
for reception of the material to be grated, a body part for housing two rotary
It is provided
rasping drums and tray or chute below for the grated material.
with a clamp or other means for fixing. The drums are caused to turn together
but in opposite directions by toothed gearing, when one of them is revolved by a
hand crank on its shaft. The material resting above between the drums, is

page_text: pressed by each drum towards the surface of the other by the action of the
rasp teeth, when the drums are revolved and is thus subjected to a regular
rasping.
To enable the drums to be withdrawn for cleaning, the gear wheel and crank
handle are fixed on hollow shafts, revolving in bearings in the case or frame, and
the drums are provided with projecting shafts which will pass into the aforesaid
hollow shafts and may be secured by set screws on loosening these screws, the
drums may be drawn out freely at the other end of the case without disturbance
of the toothed gearing or crank handle.
In the annexed drawing
Fig. 1 shows a cross section through this new apparatus on the line AA
of Fig. 2.
Fig. 2 a section on the line B B of Fig. 1.
Fig. 3 à plan view of the machine.
The drums or cylinders a open at one end, are arranged in a casing 6, open at
the same side; this casing carries the feed hopper c. Each of the drums or
cylinders a is firmly fixed on a spindle d, these latter holding the drums within the
casing so as to rotate freely. Each spindle & lies in a hollow shaft g or g', in which
it is held fast by means of screws s. It also engages therewith by means of a
pin v, fixed in the end wall of the drum or cylinder and engaging in a hole,
provided in the hollow shaft.
The hollow shafts g and g' are arranged so as to rotate in bearings in the wall o.
of the casing b. Upon the shaft g' a wheel r is fixed, and upon shaft g a wheel r,
gearing therewith, the crank his fixed on one of the shafts.
The shafts g and glare held in their bearings at the one end by a flange and at
the other end by the wheels r, fixed thereon and lying against the ends of the
bearing. The screw clamp n arranged on the framing serves for fixing the
apparatus when in use on a table or the like.
g
To grate any substance such as potatoes by this apparatus the shaft 9 is set in
rotary motion by means of the crank h; this arbor on its part turns the spindle d
resting in said shaft and thus the drum or cylinder a; at the same time owing to
the gearing of the wheels r, also the arbor g' and with this latter the spindle d
fixed therein and thus also the drum a¹.
The drums a receive by this arrangement a uniform rotary motion in direction of
the arrows of Fig. 2, thus gripping the material, placed in the feed-hopper, to be
grated little by little with the tooth-shaped projections on the drum surfaces,
directed against each other. In this way a continuous uniform disintegration of
the respective substance is effected.
The grated substance drops between the drums, some also passing into the drums
through the holes left by the punched up material which forms the rasp teeth and
out of this latter at the ends of the drums into the receiver m, whence it is
discharged.
The walling w passed up between the rubbing cylinders or drums a serves to
prevent the remainder of the object to be disintegrated, from being compressed
and forced through between the drums without being ground.
For cleaning the rubbing-faces of the cylinders a, these latter can be dismounted
from the casing by unfastening the screws & and withdrawing the spindles d from
the hollow shaft g g¹.
In this improved rasping apparatus-instead of constructing the rubbing
cylinders with equal diameters, as shown in the annexed drawing-said cylinders
nay also be made with different diameters or be geared to run with different
speeds.
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:
1. An improved rasp for disintegrating notatoes bread and other materiale

page_text: having two grating drums or cylinders rotated in opposite directions by suitable
gearing actuated by hand crank; and adapted to operate as described.
2. The method and means of mounting said drums by means of (removable).
spindles, inserted in non-removable hollow shafts for facilitating removal thereof
as described.
3. The rasp having rotary cylinders, casing hopper, gearing and fixing devices.
substantially as illustrated and described.
.
100
D
R. HADDAN,
Of the Firm of Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agent to Applicant.