IMPROVEMENTS IN MEANS OR APPARATUS FOR CLEANING, TRIMMING, OR DRESSING THE TEETH OF WHEELS AND OF RACKS." SP
Year: 1873

page_text: LETTERS PATENT to William Darling and Robert Sellers, of the
Airedale Works, Keighley, in the County of York, Machine and
Engineers' Tool Makers and Ironfounders, for the Invention of
"IMPROVEMENTS IN MEANS OR APPARATUS FOR CLEANING, TRIMMING, OR
DRESSING THE TEETH OF WHEELS AND OF RACKS."
PROVISIONAL SPECIFICATION left by the said William Darling and
Robert Sellers at the Office of the Commissioners of Patents, with
their Petition, on the 15th February 1873.
We, WILLIAM DARLING and ROBERT SELLERS, of the Airedale Works,
Keighley, in the County of York, Machine and Engineers' Tool Makers
and Ironfounders, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN MEANS OR APPARATUS FOR CLEANING, TRIMMING, OR
DRESSING THE TEETH OF WHEELS AND OF RACKS," to be as follows :-
The object of the Invention is to simplify the process of cleaning,
trimming, or dressing out of the teeth of wheels or of racks by self-
acting relative arrangements of the parts of the apparatus. For this

page_text: purpose, supposing the object to be operated upon to be a wheel, such
wheel is supported so as to be capable of freely revolving on a moveable
carriage or slide, and this carriage or slide has progressive to-and-fro
movement given to it by cams or tappets so as to carry the teeth to be
acted upon past and in contact with the grinding or cutting surface of a
revolving disc of the desired form. The carriage or slide also supports
an arm or arms for carrying the driver, by which the required step-by-
step movement is given to the wheel under operation for change of teeth,
subject to the cutter or grinder, and the stop for retaining or holding
the wheel between each change of movement effected by the driver so
as to keep the wheel steady during the grinding or cutting action
thereon. The progressive movement of the wheel for change of teeth
is obtained from the movement by which the teeth are moved into
action with the cutting surface, and the distance of such movement cach
time is adjustable to the pitch of the teeth of the wheel under operation, :
whilst the position of both driving and holding means are adjustable to
the size of such wheel.
Worm wheels or wheels with teeth at an angle may also be similarly
operated upon by variations in the holding means.
The grinding or cutting disc is formed of composition or other suitable
cutting or grinding material affixed to an axis, to which the required
rotary motion is given by a strap or band or by other suitable means.
The teeth of racks may be similarly operated upon by substituting a
sliding for the rotary motion, and the teeth of more than one wheel or
rack may be held and operated upon at the same time if desired.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Darling and Robert Sellers in the Great
Seal Patent Office on the 15th August 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
DARLING and ROBERT SELLERS, of the Airedale Works, Keighley,' in the 30
County of York, Machine and Engineers' Tool Makers and Ironfounders,
send greeting.

page_text: of our Lord One thousand eight hundred and seventy-three, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto us, the said William Darling and Robert Sellers, Her
special license that we, the said William Darling and Robert Sellers, our
5 executors, administrators, and assigns, or such others as we, the said
William Darling and Robert Sellers, our executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should
and lawfully might make, use, exercise, and vend, within the United
0 Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVEMENTS IN MEANS OR APPARATUS FOR
CLEANING, TRIMMING, OR DRESSING THE TEETH OF WHEELS AND OF RACкs," upon
the condition (amongst others) that we, the said William Darling and
Robert Sellers, our executors or administrators, by an instrument in
5 writing under our or their hands and seals, or under the hand and scal
of one of us or them, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Scal Patent
Office within six calendar months next and immediately after the date of
) the said Letters Patent.
NOW KNOW YE, that I, the said William Darling, on behalf of
myself and the said Robert Sellers, do hereby declare the nature of the
said Invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement
thereof, that is to say :-
The object of the Invention is to simplify the process of cleaning,
trimming, or dressing out of the teeth of wheels or of racks by self-
acting relative arrangements of the parts of the apparatus. For this
purpose, supposing the object to be operated upon to be a wheel, such
wheel is supported so as to be capable of freely revolving on a moveablo
carriage or slide, and this carriage or slido has progressive to-and-fro
movement given to it by cams or tappets so as to carry the teeth to be
acted upon past and in contact with the grinding or cutting surface of a
revolving disc of the desired form. The carriage or slide also supports
an arm or arms for carrying the driver, by which the required step-by-
step movement is given to the wheel under operation for change of teeth,
subject to the cutter or grinder, and the stop for retaining or holding the
wheel between each change of movement effected by the driver so as to

page_text: keep the wheel steady during the grinding or cutting action thereon.
The progressive movement of the wheel for change of teeth is obtained
from the movement by which the teeth are moved into action with the
cutting surface, and the distance of such movement each time is
adjustable to the pitch of the teeth of the wheel under operation, whilst
the position of both driving and holding means are adjustable to the
size of such wheel.
Worm wheels or wheels with teeth at an angle may also be similarly
operated upon by variations in the holding means.
Tho grinding or cutting disc is formed of composition or other suitable
cutting or grinding material affixed to an axis, to which the required
rotary motion is given by a strap or band or by other suitable means.
But that the Invention may be fully understood we will by the aid of
the accompanying Drawings proceed to describe means pursued by us in
carrying the same into effect.
plan view of apparatus arranged according to our Invention.
Figures 4 and 5 represent side and edge views of holding means for
use when operating on worm wheels or teeth at an angle.
In each of the views the same letters indicate corresponding parts
wherever they occur.
A is the main or bed plate of the machine on which is affixed the
main or stationary standard or head B. C is a saddle or movcable
carriage capable of movement on the bed A. to adapt it to the support of
wheels of different diameters, the teeth of which are to be cut.
E is a
slide capable of movement in the bracket C¹ affixed to or forming part
of the saddle or carriage C, and of being operated therein by the cam F,
the form of which may be varied, such cam acting on the pulley E¹,
carried by the slide E, so as by traversing the slide E to cause the
surfaces of the respective teeth to traverse into and out of position to bo
acted upon by the cutter m. The cam F is affixed to the shaft F", which
is capable of revolving in stationary bearings, and on which is affixed
the worm wheel G, the teeth of which gear with the worm H, which is

page_text: affixed on the shaft or axis I. On this shaft I is also affixed the bevilled
tooth wheel J, the teeth of which gear with the bevelled tooth wheel K
affixed on the driving shaft K³, on which is affixed the driving pulley L,
which by the strap or band L' receives motion from the pulley M upon
the shaft M, and thence communicates motion to the various parts.
The pulley M is affixed on one end of the shaft or axis M², on the other
end of which is affixed the disc M³, the periphery m of which is formed
to act in cleansing, trimming, or dressing out the teeth as desired, and
M³ is a driving pulley affixed intermediately on the axis M¹ to receivo
motion by a strap or band from a steam engine or other suitable power.
N, N', are arms projecting at right angles to each other from the slide E
for carrying parts to give motion to or retain a wheel e, supported by
the frame E, whilst it is under operation. The arm N supports with
capability of adjustment to different sizes of wheels the arm o carrying
the spring stop o¹, which acts to retain the wheel e in position during
each operation thereon by the wheel m, and yet admits of its stop-by-
step rotary motion in one direction. The arm N¹ carries the crank lever
P for effecting the progressive rotary motion of the wheel e to be acted
upon. This lever P works loosely on a stud fixed to the bracket P¹, and
this bracket P¹ is moveable to and fro on the arm N¹ according to the
size of wheel for the time to be operated upon, and it is secured as
desired by set screw. On one end of the crank lover P is applied the
regulating screw P², which when the slide E descends comes in contact
with the part R to give motion to the lever P, and thence by the spring
› end piece P³ to act on the teeth of the wheel under operation to alter-
nately give motion to the wheel, a distance of from one tooth to the
next, or to aid in holding the whicel stationary during the action thereon
by the surface m of the disc M³.
The variation of distance moved is variable to different sizes of teeth.
It will readily be understood that the teeth of racks may be similarly
operated upon by substituting a sliding for the rotary motion described,
and also that the teeth of more than one wheel or rack may be held and
operated upon at the same time if desired.
Having thus described our Invention and means which we adopt in
5 carrying the same into effect, we would have it understood that we do
not confine ourselves to the precise arrangements of parts, as the same
may be varied, but what we do claim is the adaptation or combination

page_text: of parts forming means or apparatus for cleaning, trimming, or dressing
the teeth of wheels and of racks, substantially as described.
In witness whereof, I, the said William Darling, have hereunto set
my hand and seal, this Eleventh day of August, in the
our Lord One thousand eight hundred and seventy-three.
year of