Certain Improvements in Gear Cases Cases for Bicycles and other Velocipedes and the like.
Year: 1896

page_text: Date of Application, 26th May, 1896
Complete Specification Left, 26th Feb., 1897-Accepted, 10th Apr., 1897
PROVISIONAL SPECIFICATION.
Certain Improvements in Gear Cases
Cases for Bicycles and other
Velocipedes and the like.
We. WALTER HENRY CORKER, of Vulcan Works, Wolverhampton in the County
of Stafford, Manufacturer, and S. J. & E. FELLOWS LIMITED, of Vulcan Works,
aforesaid, Manufacturers, do hereby declare the nature of this invention to be as
follows:-
This invention consists of the hereindescribed improvements in sheet steel or
other sheet metal gear cases which are used on safety bicycles and other velocipedes
and the like to enclose the driving chain and chain wheels. According to this
invention the said gear cases are stamped from thin sheet metal and corrugated
thus they can be made lighter and stronger than heretofore.
We may for instance stamp the main portion of the gear case (which as is well
known is of an elongated somewhat oval form) from a suitable thin sheet metal
blank with the edge raised all round and flanged inwardly thus forming the back
of the gear case with the sides and an inwardly projecting front flange for the
attachment of the front plate or cover which is made separate and secured to the
flange by screws or other suitable means so as to be readily removed when required.
The said flange is by preference rebated or recessed so that the front cover or
plate will be flush with the front of the gear case. In order to strengthen the
back and front of the said gear case we corrugate them longitudinally or
or diagonally or otherwise by stamping the gear case and cover in dies of
corresponding corrugated form. A strong gear case and cover can thus be made
from much thinner sheet metal than can be used if the gear case and cover are
not corrugated.
Instead of the flange being formed only on the back part of the gear case as
above described, both the front and back of the gear case may be flanged or dished
so as to meet and be connected at or about the centre of the gear case which will
thus be formed in corresponding halves both of which will be strengthened by
corrugations as above described.
Dated this 22nd day of May 1896.
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Certain Improvements in Gear Cases for Bicycles and other
Velocipedes and the like.
We, WALTER HENRY CORKER, of Vulcan Works, Wolverhampton, in the County
of Stafford, Manufacturer, and S. J. & E. FELLOWS LIMITED, of Vulcan Works,
aforesaid, Manufacturers, 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 consists of the hereindescribed improvements in sheet steel or

page_text: other sheet metal gear cases which are used on safety bicycles and other veloci-
pedes and the like to enclose the driving chain and chain wheels. According to
this invention the said gear cases are stamped from thin sheet metal and corrugated
thus they can be made lighter and stronger than heretofore.
On the accompanying drawings
Fig. I is a side elevation of a gear case made in accordance with this invention;
Fig. 2 is a cross section of the same on line X X of Fig. 1; Fig. 3 is a cross
section of the same on 'line Y Y of Fig. 1; and Fig. 4 is a sectional plan of the
same on line ZZ of Fig 1.
:
The same letters of reference indicate the same parts in all the figures.
The stamped thin sheet metal gear case illustrated by our drawing is strengthened
by being stamped with diagonal corrugations marked a bat the front and at the back
of the gear case these corrugations extending also for some distance round the rounded
edges' of the same thus considerably strengthening the gear case and enabling it to be
made lighter than heretofore. The particular construction of the gear case, that is to
say, the number of parts of which the gear case is made and the shape of these parts
and the way in which they are secured together, forms no part of our present
invention which as before stated consists in stamping the gear cases with corrugations
so as to strengthen the same and is applicable to all kinds of stamped. sheet metal
gear cases. The particular gear case illustrated by our drawing consists of an upper
part A A² and a lower part B B fitted together along the centre line a² with their
edges overlapping. This gear case is made from four thin sheet metal stampings
marked respectively A.A2 (seamed or soldered together along the edge a¹ and forming
the upper part of the gear case) and two similar stampings marked respectively B' B
(seamed or soldered together along the bottom edge 6 and forming the lower part of
the gear case). It will be understood that the dies in which the sheet metal parts of
the gear case are sunk so as to form the corrugations a, b.at the same time that the
blanks for forming the parts of the gear case are raised to their required shape.
Instead of the gear case being strengthened by diagonal corrugations as above
described and shewn upon our drawings we may corrugate the gear case
longitudinally or vertically or in any other direction to strengthen the same as
stated above.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed,, we declare that what, we
claim is t
Aihen 1
·
Q
A stamped sheet metal gear case for bicycles, and other velocipedes and the
like strengthened by baving corrugations stamped. upon it substantially as
herein before set forth.
Dated this 25th day of February 1897
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.