Improvements in Tooth Gearing for the Transmission of Power.
Year: 1895

page_text: Date of Application, 29th June, 1895
Complete Specification Left, 12th Mar., 1896-Accepted, 18th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvements in Tooth Gearing for the Transmission of Power.
I, JOHN WHITTAKER, of Sun Iron Works, King Street, Oldham, in the County
of Lancaster, Mechanical Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in tooth gearing for the transmission of
power and has for its object to overcome the vibration arising from the impact of
the teeth and thus reduce breakages and ensure steady air silent running of the
wheels.
To this end my improvements consist in forming the teeth and rim and the arms
of the wheel apart from each other and inserting or ferming between the same a
packing of wood or other suitable material adapted to break or cushion the
vibration resulting from the impact of the teeth.
According to one form of my invention I cast the arms with a rim in the
outer periphery of which I form recesses or pockets in sections or otherwise. In
a like manner I form recesses or pockets in the inuer periphery of the said
toothed rim.
The said recesses or pockets are adapted to receive the aforesaid packing which
is allowed to project from the inner and outer of the said peripherys respectively
and arranged to interlock with each other and thus break or cushion the vibration
due to the impact of the teeth and prevent the same being transmitted on to the
inner part or arms of the wheel.
Dated this 28th day of June 1895.
F. BOSSHARDT & Co.,
Agents to Applicant.
Improvements in Tooth Gearing for the Transmission of Power.
I, JOHN WHITTAKER, of Sun Iron Works, King Street, Oldham, in the County
of Lancaster, Mechanical 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 improvements in tooth gearing for the transmission of
power, i.. to wheels having cast teeth and has for its object to overcome the
vibration arising from the impact of the teeth and thus reduce breakages, ensure
steady and silent running and greater durability of the wheels.
And in order that my invention may be more fully understood I have caused to
be appended hereunto two sheets of drawings marked with letters of reference
indicating like parts in the various figures.
Figs. 1 & 3 are side views partly in section and Figs. 2 & 4 cross sections of a
spur and bevel wheel respectively constructed in accordance with my invention.
In carrying out my invention and referring to the figures generally, the
improvements consist in forming the tooth rim a and the boss and arms having a
rim b, apart from each other, in segments or in two annular parts as shown in
the drawing and inserting or forming between the same a packing c, c', of hard wood
Q71

page_text: or other suitable material, adapted to break or cushion the vibration resulting from
the impact of the teeth in the following manner;-
The inner periphery of the tooth or outer rim a I form with recesses or pockets d,
arranged in sections, in the present instance in three, and adapted to receive the
packing e the intervening spaces or sections a¹ being left plain so as to represent an
alternate plain and recesses or pocketed inner periphery.
The said outer or tooth rim a is then bored through, the recesses or pockets d
fitted with hard wood or other material c (similar to an internal mortice wheel) so
as to project internally from the plain spaces or sections a' and to be contiguous
with each other for the apportioned space. The packing c is then also bored
through, to a somewhat smaller diameter than the size to which the inner or arm
rim b is bored.
The outer periphery of the rim I also form alternately with recessed or
pocketed and plain spaces or sections ¹ & 61, respectively corresponding in number
with those of the tooth rim a. This rim is turned on the periphery to the size
to which the packing c in the outer rim a has been bored. The pockets in the
intermittent spaces of the rim & are then also fitted with packings of hard
wood or other material as before described and the periphery of the packing c
turned to fit the inner periphery or plain spaces or sections a¹ of the toothed rim a
bored out.
The inner rim is then forced inside the outer rim a, the packings e of the outer
rim a fitting and resting upon the plain space or sections of the inner rim band
the packings c¹ of the latter fitting against the metal plain spaces or sections a' of
the outer rim a.
The packings c,, of the outer and inner rims a & respectively then interlock
with each other forming a continuous ring of packing so that the metals of the two
rims a && do not come in contact, thus breaking or cushioning the vibration due
to the impact of the teeth and preventing the same being transmitted to the inner
rim of the wheel.
It is not necessary that the sections of packings e, e, should interlock of
themselves, as a small space e may be left between the packings of one rim and that
of the other and fitted with folding keys to ensure the rim always being kept tight
in case the said packing should shrink through excessive heat.
To ensure the rims a & b being kept in position with each other 1 apply to each
side of the wheel a metal ring y bolted to each other through the packings c, c', as
shown in the drawings.
I am aware that wheels have been formed in two annular parts with the object
of breaking the impact exerted upon the teeth and therefore do not wish to claim
the same as new.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim, is-
In tooth gearing, wherein the tooth rim is cast separate from the arms and boss
of the wheel, forming the tooth or outer rim a and the arm or boss rim b with
recesses or pockets d, d', and plain spaces or sections a³ & respectively, the said
recesses or pockets being adapted for the reception of packing e, c', the
packing e of the outer rim a fitting against the plain spaces or recesses of the
inner rim and the packing cl of the inner rim against the plain spaces or
sections a' of the outer rim a, all substantially as and for the purpose hereinbefore
set forth.
Dated this 11th day of March 1896.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.