Improvements in Gear Cases and in the Manufacture of the same.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Gear Cases and in the Manufacture of the same.
We, JOSEPH HENRY HUGHES, of Aston Junction, Aston juxta Birmingham, in
the County of Warwick, Works Manager, and JOHN THOMAS MUSGROVE, of 53,
Colville Road, Sparkbrook, Birmingham aforesaid, Mechanic, do hereby declaro
the nature of our said invention to be as follows:-
Our invention has for its object improvements in gear cases and in the manu-
facture of the same by which we are enabled to easily and readily obtain access
to the driving chain without detaching the main body of the gear case and also
to materially reduce the cost of manufacture.
In carrying our invention into practice we form the back or main body or
frame of our gear case out of a metal blank by suitable tools, the rear end or por-
tion which fits around the hub sprocket wheel being made detachable or this
portion of the frame of the case may be made from a separate metal blank. The
centre portion of this frame is cut away and a division or bridge piece or frame
fixed thereto so as to separate the top and bottom portions of the driving chain.
Suitable provision is also made for the bracket spindle and hub spindle to revolvo
in. The front portion of our case we form in one or two parts either from celluloid,
tin or other metal or material, the outer edges of which fit into grooves formed on
the edges of the main portion or frame and the inner edges are held in position by
strips of metal which are secured to the centre bridge piece and an adjustable slide.
Fixed at the front end of this centre bridge piece is a strut or stay to which an
adjustable clip is secured for fixing the gear case to the frame of the cycle. The
clip which holds the rear portion of the gear case is also adjustable and may be
provided with means for regulating the position of the gear case.
0013
T 1
100%
GEORGE BARKER,
Agent for Applicants, 77, Colmore Row, Birmingham.
COMPLETE SPECIFICATION.
Improvements in Gear Cases and in the Manufacture of the same.
We, JOSEPH HENRY HUGHES, of Aston Junction, Aston juxta Birmingham, in
the County of Warwick, Works Manager, and JOHN TшоMAS MUSGROVE, of 53,
Colville Road, Sparkbrook, Birmingham aforesaid, Mechanic, do hereby declare
the nature of my said invention and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement:-
Our invention has for its object improvements in gear cases and in the manu-
facture of the same by which we are enabled to easily and readily obtain access

page_text: to the driving chain without detaching the main body of the gear case and also
to materially reduce the cost of manufacture.
In carrying our invention into practice we form the back or main body or
frame of our gear case out of a metal blank by suitable tools, the rear end or por-
tion which fits around the hub sprocket wheel being made detachable or this
portion of the frame of the case may be made from a separate metal blank. The
centre portion of this frame is cut away and a division or bridge piece or frame
fixed thereto so as to separate the top and bottom portions of the driving chain.
Suitable provision is also made for the bracket spindle and hub spindle to revolve
in. The front portion of our case we form in two parts either from celluloid
tin or other metal or material. the outer edges of which fit into grooves formed on
the edges of the main portion or frame and the inner edges are held in position by
strips of metal which are secured to the centre bridge piece and an adjustable slide.
Fixed at the front end of this centre bridge piece is a strut or stay to which an
adjustable clip is secured for fixing the gear case to the frame of the cycle. The
clip which holds the rear portion of the gear case is also adjustable and may be
provided with means for regulating the position of the gear case.
In order that our invention may be clearly understood and easily carried into
practical effect we have appended hereunto two double sized sheets of drawings
upon which we have illustrated examples of our improved gear case.
Figure 1 is a front elevation of our gear case complete.
Figure 2 is a part front elevation shewing the end detached and the celluloid
front removed.
Figure 3 is a back view of Figure 1.
Figure 4 is a front elevation of the body portion which is formed in one piece.
Figure 5 is a cross sectional view taken on the line ab of Figure 4.
Figure 6 is a cross sectional view taken on the linery of Figure 2 with a por-
tion of the clip R detached.
Figure 7 is a cross sectional view of Figure 1 taken on the line 1-2.
Figure 8 is a front elevation of the slide E.
Figure 9 is a plan view of Figure 8.
Figure 10 is a plan view shewing the clip R.
In carrying our invention into practice we form the back or main body ou
frame A of our gear case out of a metal blank or sheet of metal by suitable tools
so as to raise the sides and one end. The edges a¹ of these sides and the one end
are then turned over at right angles so as to form an inwardly turned flange. The
slot a² is then cut in the centre of the back or base of this frame extending from the
open end about three parts the way up, the slot then closes in or narrows and is
then formed partially circular for the boss or spindle of the bottom bracket sprocket
wheel to pass through as clearly shewn at Figure 4. A strip of metal a³ is then
secured under the flange a¹ so as to form a recess or groove all round the interior
of the sides. We then secure the division or parting strips B partly around the
edges of the larger portion of the slot a² so as to separate the top and bottom
portions of the driving chain the edges 1 of these parting strips being
flanged over at right angles the end piece 2 being also flanged over. Fitted
into the narrow part of the slot a² is the inwardly curved portion which fits
partly around the back forks of the cycle frame. On the end of the case A where
the parting strips finish we secure the pieces D provided with the grooves d into
which the slide E fits. One end of this slide is bent over at right angles and is
provided with the side pieces c¹ which fit against the parting strips thus entirely
closing this end of the parting strips. The other end of the slide E is formed with
the slots e² and e³ the slot e2 is for the spindle of the wheel to pass through and the
slot 3 which is formed on the side of the slide is provided for the back stay screw
or nut to pass through. On the opposite side of the case A we form the grooves f
in which the slide Ffits this slide being provided so as to fit around a portion of the
hub of the wheel for preventing dust and dirt from entering the other portion being
enclosed by the slide F¹ which fits partly into the grooves f2 and partly into the

page_text: grooves h¹ formed on the end piece H. This end piece which fits onto the parts
and is held in position by the thumb screws 2 and 3 entirely encloses the sprocket
wheel on the rear wheel of the cycle thus completely surrounding the driving chain
and sprocket wheels. The front portion or face of our gear case is formed in two
parts J and J either from celluloid tin or other metal or material. In the example
as shewn on the drawing we have formed the front of celluloid the outer edges of
which fit into the groove formed around the edge al of the case A, and are held in
position by the screws . The inner edges of the parts J and J' which fit around
the flanges b¹ of the parting strips are held in position by the L shaped strips N, NI
which are secured to the parting strips by the screws n² but the inner edges of the
parts J and J which overlap each other are held in position by the hook shaped
clips nn. The hole n is provided for the spindle of the bracket to pass through.
The front part J J' instead of being divided where the spindle of the bracket passes
through and held together by the clips n may be formed in one piece and in this
case to fix the front in position the narrow ends are first slipped under the flange a¹
& pushed down towards the narrow end of the case, the broard end in which the
hole n is formed is then slipped under the flange a¹ also and the strips N & N¹ are
afterwards fixed in position:
Fixed between the parting strips B at the front end of the case is the strut or
stay P provided with the slots p' through which the ends of the clip R pass. This
clip is formed trough shaped the ends which pass through the strut or stay. P being
screw threaded. Fitted onto these ends of the clip between the stay and the clip
is the adjusting piece S formed with a hollow or other shape on its inner surfaco
as clearly shown at Figure 10. This adjusting piece is provided so as to enable
the gear case to be fixed to any velocipede as the chain lines vary in different builds
of machines and when necessary by reducing the thickness of this block the gear
case can be brought exactly over the centre of the sprocket wheels.
The strut or stay T which is fixed between the parting strips at the opposite end
is provided so as to support that end of the gear case.
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:-
CLAIMS.
First: The improvements in gear cases and in the manufacture of the same con-
sisting essentially in forming the main portion or body such as A from a single
sheet of metal or a metal blank by suitable tools and having a groove or recess
around the edges in which the outer edges of the front portion which is formed in.
one or more parts from celluloid or metal or other material fit in the manner as
herein before described and as shewn upon the accompanying sheets of drawings.
Second-In gear cases such as claimed in the first claim forming the front por-
tions such as JJ1 in one or more parts so as to be easily detached and securing the
same to the main portion such as A in the manner substantially as herein set forth
and as shewn upon the accompanying sheets of drawings.
Third: In gear cases the clip such as R with the adjusting block such as S for
securing the case to the frame of a cycle in the manner substantially as and for the
purpose herein set forth and as shewn upon the drawings.
Dated this 30th day of November 1897.
GEORGE BARKER,
Agent for Applicants, 77, Colmore Row, Birmingham.
GEORGE BARKER,
Agent for Applicants, 77, Colmore Row, Birmingham.