Year: 1888

page_text: I, ARTHUR BRAMHAM PERKINS, of the Forge, Thornton Road, Bradford, in the
county of York, Ironmaster and Engineer, do hereby declare the nature of this
invention to be as follows:-
My invention relates to gear wheels in which wooden teeth, inserted into mortices
in the rim of the body of the wheel, are employed to prevent noise.
In wheels of this class as heretofore constructed, the teeth are liable to break off
near the rims owing to the great strain upon the same when in use. .
The object of my invention is to construct a wheel which combines with the noise-
lessness of a wooden toothed wheel the strength of a wheel having metal teeth, and to
this end it comprises the improvements hereinafter described.
According to my said invention I form integral with the rim of the wheel a number
of half teeth so that the front or working side of each tooth has the appearance of
being cut away and in front of each tooth in the rim of the wheel I form a dovetailed
or undercut groove. Into this groove I fit a piece of wood which extends upwardly
and is at one side in close contact with the face of the adjacent half tooth so that the
latter forms a support for the wood. The piece of wood is then so shaped as to form
with the metal half tooth a perfect tooth.
If desired one or more pins screws or rivets may be inserted through the half tooth
into the wood or vice versa in order to hold the latter firmly to the wood. Or cement
or other suitable means may be used for the purpose.
Instead of using wood I may employ brass iron, steel or other metal replaceable
when worn.
The chief advantages of my invention in addition to those above mentioned are that
the pieces hereinbefore described can be readily renewed or replaced, as a number of
them can be kept in stock ready shaped, and that the quantity of wood or metal
required for facing the teeth is small as compared with the quantity required for
wheels of ordinary construction.

page_text: I sometimes form shrouds or flanges integral with the body of the wheel and the
half teeth in order to strengthen the latter. In this case the recesses in front. of the
half teeth are mado plain and the loose pieces instead of being inserted from the sides
of the wheel are inserted into the recesses from the periphery of the wheel.
Dated the 2nd day of Mo.. 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.
1, ARTHUR BRAMHAM PERKINS, of the Forge, Thornton Road, Bradford, in the
County of York, Ironmaster and 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 :-
My invention relates to gear wheels and chiefly to gear wheels in which wooden
teeth, inserted into mortices in the rim of the body of the wheel, are employed to
prevent noise.
In wheels of this class as heretofore constructed, the teeth are liable to break off
near the rims owing to the great strain upon the same when in use.
The object of my invention is to construct a wheel which combines with the noise-
lessness of a wooden toothed wheel, substantially the strength of a wheel having metal
teeth, and to this end it comprises the improvements hereinafter described.
In the accompanying drawing
Figure 1 is a sectional elevation of a portion of a gear wheel having teeth con-
structed according to my invention.
Figure 2 is a similar view illustrating a modification of my invention, and
Figure 3 is a plan of the same.
a is the rim of the wheel which has formed integral therewith the half teeth b, that
is to say, teeth which have the front or working sides cut away, as shown at c in
figure 1.
In front of each tooth in the rim of the wheel, I form a dove-tailed or undercut
grooved and into this groove I fit a piece e of wood, which is at one side in close
contact with the adjacent half tooth, so that the latter forms a support for the wood
and serves to face the same. The piece of wood is then so shaped as to form with the
metal half tooth a perfect tooth.

page_text: In order to hold the wood firmly in place, I sometimes insert a screw through the
metal half tooth into the wood as shown at f, or I can employ a rivet g, as shown in
figure 1ª, the said rivet having a tapering head formed with a shoulder h which bears
against the metal half tooth as at i, so that as the part e of the tooth wears, the rivet
will not work loose. Cement or other suitable means may be used for securing the
wood portions of the teeth.
I sometimes form shrouds or flanges ; integral with the body of the wheel and the
half teeth, as shown in figures 2 and 3, in order to strengthen the latter. In this case
the recesses d in front of the half teeth are made plain instead of being dovetailed or
undercut and the loose pieces e instead of being inserted from the sides of the wheel
are inserted into the recesses from the periphery of the wheel. To hold the pieces e in
close contact with the metal half teeth, the shrouds are grooved as shown at k.
Screws or the like are inserted into the pieces e near their bases to prevent them from
falling out of the grooves d.
Instead of using wood, I may employ brass, iron, steel, vulcanite, or other material
replaceable when worn. When I employ vulcanite pieces e, I prefer to effect the
vulcanization of the said pieces after they have been applied to the wheel.
Instead of forming only one side of each tooth of wood or the like both sides
may be faced with the same material, in which case the portion 6 of the tooth
which is integral with the wheel is made narrower.
The chief advantages of my invention, in addition to those above mentioned, are
that the pieces herein before described can be readily renewed or replaced, as a number
of them can be kept in stock ready shaped, and that the quantity of wood or metal
required for facing the teeth is small as compared with the quantity required for
wheels of ordinary construction.
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.) A gear wheel the teeth of which are each formed in two parts, one of which
parts is integral with the rim of the wheel, while the other part is formed of a
piece of wood or other suitable material which is located or secured in a suitable
recess or groove and serves as a face for the tooth.
(2.) A gear wheel having teeth part of each of which is formed integral with the
rim of the wheel, while the other part is secured in a dovetailed or undercut groove
at the base of the other part, substantially as described.
(3.) A shrouded gear wheel having teeth which are partly integral with the body of
the wheel and which are partly composed of wood or other material inserted into
recesses at the bases of the solid portions, the loose portions of the teeth being held in
contact with the solid portions by forming grooves in the shrouds into which the wood
or other loose portions fit, substantially as described.
(4.) A gear wheel the teeth of which are faced on both sides with wood or the
like, substantially as described.
Dated the 2nd day of October 1888
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant