Improvements in Toothed Gearing.
Year: 1896

page_text: Date of Application, 7th Nov., 1896
Complete 8pecification Left, 7th Sept., 1897-Accepted, 9th Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in Toothed Gearing.
We, HENRY BELCHER, General Manager, of Messrs. Humber & Co. Ltd.,
Beeston, in the County of Nottingham, and FREDERICK EASOM of 53 City Road,
Beeston, in the County of Nottingham, Engineer, do hereby declare the nature of
this invention to be as follows:
This invention relates to gearing and may be carried out in the following
manner:-
We divide each complete tooth into preferably two halves and secure these so
as to break-joint, that is to say that one half tooth will lie opposite the space
between two of the half teeth in the other portion, being fixed in that position in
any desired manner.
The other wheel or toothed device will be similarly constructed.
In the case of wheels having teeth on the face a crown or bevel wheel for
example the teeth would be divided as before described, the second row of teeth
resting upon a disc fitting into a recess provided for it in the wheel, and fixed by
screws, pins or other suitable means.
Where the teeth are specially cut, we prefer to cut the teeth of the full length
to start with, and afterwards to turn them to their subsequent positions, thus
obtaining great accuracy in the teeth.
By this arrangement we secure the engagement of at least three teeth or portions
of teeth in each wheel at one time and thus secure smooth and silent running.
Dated this 7th day of November 1896.
BOULT & WADE,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Toothed Gearing.
We, HENRY BELCHER, General Manager, of Messrs. Humber & Co. Ltd.
Beeston, in the County of Nottingham, and FREDERICK EASOм of 53 City Road,
Beeston, in the County of Nottingham, Engineer, 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:-
This invention relates to gearing and may be carried out in the following
manner:-
We divide each complete tooth into preferably two halves and secure these so
as to break-joint, that is to say that one half tooth will lie opposite the space
between two of the half teeth in the other portion, being fixed in that position in
any desired manner.
The other wheel or toothed device will be similarly constructed.
In the case of wheels having teeth on the face a crown or bevel wheel for
example the teeth would be divided as before described, the second row of teeth

page_text: resting upon a disc fitting into a recess provided for it in the wheel, and fixed by
screws, pins or other suitable means.
Where the teeth are specially cut, we prefer to cut the teeth of the full length
to start with, and afterwards to turn them to their subsequent positions, thus
obtaining great accuracy in the teeth.
By this arrangement we secure the engagement of at least three teeth or portions
of teeth in each wheel at one time and thus secure smooth and silent running.
In the accompanying drawings
Figure 1 is an elevation of a bevel wheel constructed in accordance with this
invention.
Figure 2 is a section of the same on the line 2-2 of Fig. 1.
Figure 3 is a part sectional plan of the improvements applied to the gearing of
a chainless safety bicycle.
Like letters indicate like parts throughout the drawings.
The gear wheel is formed double being composed of two parts A and B. The
outer part A comprises a disc with the bevel teeth A¹ on its face around its edge,
the thickness of the disc A being such as to allow of its being recessed out on its
face sufficiently to receive the other part of the wheel B which is in effect a
second bevel wheel. The teeth B₁ of this correspond to those of the other part A.
By thus constructing the bevel wheel in two parts, each tooth is practically
divided into two parts, which are movable relative to each other, the preferable
position of these parts being so as to break-joint in the manner illustrated in
Figure 1, but in order that the arrangement may be adjusted as desired one or
more slots C are formed in the disc of the part A through which and into the
disc B pass screws D. By tightening these screws the two parts may be firmly
attached to one another, while the slot C allows of the adjustment of the relative
position of the teeth A¹ and B', in order to take up backlash arising from wear.
In Figure 3 the arrangement is shown applied to what is known as chainless
driving gear for a bicycle. The double bevel wheel composed of the two parts A
and B is mounted on the crank axle E carried in bearings in the bottom
bracket F. The shaft G which forms the connection between the crank axle and
the hub of the driving wheel carries fixed to its end a corresponding double bevel
pinion composed of parts a and b, the ball bearings of this shaft G being preferably
arranged as shown at H.
In constructing double gear wheels other than of the bevelled type it is obvious
that the details of construction may vary slightly as also they may in constructing
wheels of the type above described.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. A "double" toothed wheel such as A B.
2. In toothed gearing dividing each tooth into two halves adjustable in relation
to each other substantially as described.
3. In toothed gearing a bevel wheel having another bevel wheel carried in a
recess on its face the teeth of the two wheels being adjustable so as to be arranged
to break-joint substantially as described.
4. The complete. toothed gearing substantially as described and illustrated in
the accompanying drawings."
Dated this 6th day of September 1897
BOULT & WADE,
Agents for the Applicants.