Year: 1886

page_text: I, OSCAR FREDRIK JONSSON, Electrician, of Stockholm in the Kingdom of
Sweden, 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 :-
The object of this invention is a construction of cog wheels with wooden cogs,
which construction is principally due to the want of having a silent gearing for
transferring the force from a motor to several dynamo-machines and for obviating
the use of belts which owing to their gliding on and getting off the pullies do not
afford a sufficient guarantee that the requisite rotatory speed is really imparted to
the dynamo-machines and that no stop occurs. Another important circumstance is
that dynamo-machines, when using such a gearing as the present, do not occupy so
much space (3 to 4 times less) as those with beltings.
On the annexed drawing Fig. 1 shows part of such a cog wheel viewed from the
side, and Fig. 2 in section. Figs. 3 and 4 represent a cog segment viewed from
the side and from the end.
In order that the cog wheel may obtain a sufficient solidity together with
lightness the body of the wheel is made of two concave plates A, which by means
of screws B are secured to the outer side of the flanges of a common centre C.
In order that the screws passing through the flanges may firmly pinch the plates
all around against the flanges, washers D are placed under the screw heads.
Between the outer edges of the plates A the cog segments E of suitable wood are
inserted. To these segments is, by a suitable treatment, given such a shape that
the surfaces of them, on which the plates are to be laid, converge towards the
circumference, while the surfaces of the segments turned one against another
converge towards the centre, that is go in the direction of the radius. With this
disposition is obtained that the cog segments after their inserting cannot be
dislocated neither outwards nor inwards or change position in another way. In
the sides of each cog segment are the slots F, which, when two segments are placed
together, form an elongated hole. Through these holes the screws G are passed
traversing the plates. Wood screws screwed through the plates into the segments
contribute still more to secure the segments. In order partly to give these
segments a greater strength against splitting and partly not to want too many
segments in a wheel, more than one cog is cut out of each segment (here three)

page_text: depending upon the division. In order to strengthen the cogs against wear, the
pinion or pinions with which they are gearing are made of steel or other suitable
matter with polished cogs, which cogs are evidently not in want of having so great
a thickness as the wooden cogs, wherefore these are made comparatively thicker.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is
A cog wheel with wooden cogs, in which the body consists of plates (A) which
by means of screws are fixed at a common centre (C) and between which at the
circumference are placed close to each other a number of cog segments (E) with
more than one cog in each and the sides, upon which the plates are laying, con-
verging outward in order to prevent dislocation of the inserted segments which
besides are pinched between the plates by means of screws (G) passing through
elongated holes between the segments and through the plates.