Improvements relating to Erasers.
Year: 1891

page_text: Date of Application, 9th May, 1891
Complete Specification Left, 24th Nov., 1891-Accepted, 2nd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements relating to Erasers.
I, THOMAS RICHARD SHILLITO of 89 Chancery Lane, in the County of
Middlesex, Consulting Engineer and Patent Agent, do hereby declare the nature
of this invention, a communication to me from abroad by Charles Laurence
Burdick of Madison in the State of Wisconsin, United States of America, Portrait
Artist, to be as follows:-
The ink or colour eraser of this invention has the form of a round case or tube
for containing the parts. The forward end is slightly tapered and the other end
has an internal screw thread into which an extension to form a handle is screwed
for convenience in removing. Within the case is mounted a wind wheel on a
spindle carried in bearings. On the same spindle there is a balance wheel. The
forward end of the spindle extends beyond its forward bearing on the case and is
connected to a coil spindle of fine wire on the extremity of which is fixed the
eraser head. Outside the fine wire coil spindle there is a larger coil the back end
of which is fixed to a chest containing the wind and balance wheels and the front
end is fitted with a bearing for the extreme forward end of the fine wire coil outside
the case close to the eraser head. This latter has cutting edges which upon being
rotated when held in contact with paper cut or scrape the same. The rotation is
effected by means of a small air pump which forces air through a tube so as to act
on the wind wheel. The eraser head is set in motion, controlled and stopped by
means of a finger lever which according as it is in the free position or pressed by
The
the finger from the outside of the case controls an air valve within the same.
lever and valve are actuated or acted upon by a spring to close the valve. The
spring is bent in such a way that by tightening a screw its resistance may be
increased.
Dh of Mar 1901
T. R. SHILLITO,
89, Chancery Lane, London, W.C.
COMPLETE SPECIFICATION.
Improvements relating to Erasers.
I, THOMAS RICHARD SHILLITO of 89 Chancery Lane, in the County of
Middlesex, Consulting Engineer and Patent Agent, do hereby declare the nature
of this invention, a communication to me from abroad by Charles Laurence
Burdick of Chicago in the State of Illinois, United States of America, Portrait
Artist, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to that class of devices by means of which ink may be
erased from paper, and its object is to provide an instrument whose cutting or
erasing tool is rotated through the medium of compressed air.
This eraser is adapted to erase ink or colour in lines or dots or evenly over any
given surface, either removing the ink or colour entirely to leave the white paper,
or taking off a part to produce shades, which results may be produced by the
amount of pressure or movements of the hand of the operator, thus greatly aiding
the artist in manipulating with indian ink and water colour paints and it may still
further be used by the crayon artist producing results in both these fields
otherwise unattainable.

page_text: is a top view or the eraser of this invention with a portion of the front
end broken away to shew some of the inner parts.
Fig. 2 is a section taken through line 1--1 of Fig. 1.
Fig. 3 a section through line 3-3 of Fig. 2.
Fig. 4 a section through line 4-4 of Fig. 2.
Fig. 5 a back end view of the erasing tool on an enlarged scale.
Fig. 6 a sectional view of the same with its operating and supporting
mechanism.
Fig. 7 is a detail view of the finger piece and lever for operating air valve and
shewing the construction of the break which engages the rim of balance
wheel.
a is a casing preferably cylindrical having a conical or taper nose a¹ inserted in
its front end and a removable shaft or tail piece a². the erasing tool having
sharp spiral ridges to cut or wear off the surface of paper. is formed with a
short spindle fitted in bearing which is supported in its place by a spring coil c
securely attached to a projection from the partition p. The erasing tool has
flexible connection with driving spindle d by means of spring coil c¹. d is carried
in bearings e, e adjustably fitted in fixed partitions p, p². t is a tube entering and
fixed to casing a and adapted to receive compressed air through flexible tube 9 and
fixed tube g¹.
v
The compressed air is forced through valve opening (Figs. 2, 4) past the inner
surface of soft rubber tuber along tube t and is directed upon the blades of
propeller wheel w from inlet port i.
Propeller wheel w is secured upon and rotates driving spindle d. The sides of
this wheel adjacent to the outer rim are closely housed by partitions p', ², keeping
the compressed air bearing upon the blades of the wheel until it finds its outlet
at (Fig. 3). On driving spindle d there is further fixed a balance wheel h.
is a finger piece with lever pivotted or jointed at and having an arm 12
projecting into the casing. Projecting at right angles from the bottom of 12 there
is a part which normally bears upon the soft rubber immediately over tube
opening v. s is a spring fixed to a projection from the inside of casing a and bears
upon the arm or part 3 keeping the tube or valve opening v, normally closed.
13
m (Figs. 2, 7) is an extension from the front end of lever immediately under
the finger piece. It enters the casing to immediately under the rim of balance
wheel h. It is fitted with a leather strip n which is normally in contact with the
inner rim of the wheel, the tension of the leather strip being adjusted by means of
a screw and nut and made to press against the balance wheel more or less firmly.
By reason of this arrangement of parts a pressure on the finger piece f will open
valve v and at the same time disengage the break from the balance wheel /, the
compressed air then passing in, rotating propeller wheel w and other connected
parts, the sides of the wheel being closely encased by partitions p¹, p², there is
little loss of air whilst at the same time there is room for the free motion of the
wheel.
The eraser 6 and its bearing have flexible connection so that the cutting
surface will not cut in too deep when pressed upon the paper or stop the rotary
motion by a too firm adhesion to the surface of the paper and by this arrangement
of two spring coils, the heavier one for the bearing and the lighter one for
communicating motion the erasing tool 6 may be bent to various angles and its
rotary motion maintained without tendency to make a circular or gyratory motion.
The outer spring coil might be made of rubber or other yielding substance nor do
I confine myself to the described construction of valve but describe this as an easy
method of construction. The eraser head is preferably of the form shewn and
may be made of hardened metal with spiral corrugations or of any other suitable
material such as coarse stone or emery or rubber or even a burnishing too!
according to the effect desired.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. An crasing tool proper and a motor connected therewith and adapted to
impart motion to the same substantially as described and shewn.
2. An erasing tool comprising a casing, a tool proper provided with a spindle,
and a motor mounted in the casing and connected with the tool spindle, substan-
tially as described and shewn.
3. An erasing tool comprising a tool proper, a flexible shaft or spindle on which
said tool is mounted, and a motor connected with said shaft, substantially as
described and shewn.
4. An erasing tool comprising a tool proper mounted on a flexible support and
having a flexible connection with a motor, substantially as described and shewn.
5. The combination of an ink eraser provided with a rotary journal and bearing
therefor; and a handle, and a flexible support for the bearing connecting the latter
with the handle, substantially as described and shewn.
6. An erasing tool comprising a tool proper, a flexible spindle on which said tool
is mounted, a motor connected with said spindle and a stationary supporting sleeve
surrounding said flexible spindle, substantially as described and shewn.
7. In an erasing tool the combination with a motor and its housing of a tool
spindle comprising two rigid sections, one mounted in the casing and having the
motor connected therewith, and the other carrying the tool proper and an inter-
mediate flexible section, and a stationary supporting sleeve, secured at its inner
end, surrounding the tool spindle, and having a bearing at its outer end for the
outer or tool-carrying rigid section, substantially as described and shewn.
8. An ink eraser having sharp edged spiral corrugations and a journal, sub-
stantially as described and shewn.
9. An erasing tool comprising a tool proper, a revolving tool spindle, a wind
wheel mounted on said spindle and an air tube or duct connected with a source of
air under pressure and provided with a terminal blast nozzle adjacent to the wind
wheel, substantially as described and shewn.
10. An erasing tool comprising a tool proper, a revolving tool spindle, a wind
wheel and fly or balance wheel mounted on said shaft, and an air tube or duct
connected with a source of air under pressure and provided with a terminal blast
nozzle adjacent to the wind wheel, substantially as described and shewn.
11. An erasing tool comprising a tool proper, a revolving tool spindle, an air
motor connected therewith, an air supply tube or duct for said motor connected
with a source of air under pressure, and a valve controlling the passage of air
through said tube or duct, substantially as described and shewn.
12. The combination with the tool proper, its motor and controlling valve of a
cylindrical casing enclosing said motor and valve, said casing being open at its
rear end and a detachable handle adapted to fit within and close the open end of
said casing, substantially as described and shewn.
13. In an erasing tool, the combination of a tool proper, a tool spindle, and a
wind wheel on said spindle, of an air supply tube or duct, to discharge upon said
wind wheel and a housing enclosing said wind wheel having an opening at its side
for the escape of exhaust air, substantially as described and shewn.
14. The combination of a rotary ink eraser, a propeller and an air passage
leading thereto to rotate the eraser, a valve for the said passage, a break acting
upon the rotary mechanism and a finger lever connected with both the said break
and valve, whereby they may be harmoniously actuated, substantially as described
and shewn.
T. R. SHILLITO.