Improvements in Shields or Guards for the Chains and Chain Wheels of Safety Bicycles.
Year: 1892

page_text: Date of Application, 8th Mar., 1892
Complete Specification Left, 8th Dec., 1892-Accepted, 4th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Shields or Guards for the Chains and Chain
Wheels of Safety Bicycles.
We HARRY ANDREE of 4 Lincolns Inn Fields, in the County of Middlesex,
Engineer, and THOMAS HUGH ARMSTRONG of 21 Park Hill Rise, Croydon, in the
County of Surrey, Gentleman, do hereby declare the nature of this invention to be
as follows:-
The object of this invention is to provide means for completely boxing in the
chains and chain wheels of safety bicycles so as to prevent dust and mud from
getting into and between the links.
As the stay rod passes between the top and bottom parts of the chain it is
extremely difficult to box in the chain without also boxing in the stay rod. A
shield or guard has already been in use for the purpose of lubricating the chain and
chain wheels by allowing the, former to run through a bath of oil. This shield or
guard however is not generally adopted for the following reasons:-(a) it is some-
what heavy (b) it requires that the pedal and driving axles should be fitted with
stuffing boxes; (c) it is difficult to remove quickly for the purpose of examining or
adjusting the chain, and (d) it cannot be applied to all the existing patterns of
cycles.
Now by this invention the chain and chain wheels only are boxed in, by a shield
or guard which while completely enclosing these parts is yet strong, and light in
weight, requires little or no fitting, and is easily detachable so that the chain can
at any time be adjusted, lubricated, or examined, by removing or opening one of
the parts without requiring the aid of skilled workmen. The invention can be
applied to all the well known patterns of safety bicycles.
According to this invention we make our shield or guard in sections bolted or
otherwise detachably secured together, the shield or guard so made being attached
to the frame of the machine. We prefer to make the shield or guard from four
sections viz. top and bottom outer, and top and bottom inner sections, but we do
not confine ourselves to this form of construction. The two outer sections are
channel shaped in cross section and fit loosely over the crank and driving axles.
When fitted together the said two outer sections cover or shield the chain wheels
and the sides and exterior periphery of the chain. The two inner sections
are also channel shaped in cross section and cover the interior periphery of the
chain.
Dated this oth 3.
1000
F. W. GOLBY,
36, Chancery Lane, London, W.C., Patent Agent for the Applicants.
COMPLETE SPECIFICATION.
· Improvements in Shields or Guards for the Chains and Chain
Wheels of Safety Bicycles.
We HARRY ANDREE of 4 Lincolns Inn Fields, in the County of Middlesex,
Engineer, and THOMAS HUGH ARMSTRONG of 21 Park Hill Rise, Croydon, in
the County of Surrey, Gentleman, 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 to provide
571
means for completely boxing in the

page_text: chains and chain wheels of safety bicycles so as to prevent dust and mud from
getting into and between the links.
As with the majority of safety bicycles the stay rod passes between the top and
bottom parts of the chain it is extremely difficult to box in the chain without also
boxing in the stay rod. An oil containing casing has already been in use for the
purpose of lubricating the chain and chain wheels by allowing the former to run
through a bath of oil. This casing however is not generally adopted for the
following reasons:-(a) it is somewhat heavy; (b) it requires that the pedal and
driving axles should be fitted with stuffing boxes; and (c) it is practically
impossible to remove the casing without the aid of skilled workmen for the purpose
of examining or adjusting the chain.
Now by this invention the chain and chain wheels only are boxed in, by a
shield or guard which while completely enclosing these parts, is yet strong, and
light in weight, requires little or no fitting, and is easily detachable so that the
chain can at any time be adjusted, lubricated, or examined by removing or opening
one of the parts without requiring the aid of skilled workmen. The invention can
be applied to almost all the well known patterns of safety bicycles.
We make our shield or guard in sections, bolted or otherwise detachably
secured together, the shield or guard so made being attached to the frame of the
machine.
In the accompanying drawings
Figure 1 is an elevation, and Figure 2 a plan of part of a safety bicycle fitted.
with a chain and chain wheel shield or guard constructed in accordance with this
invention.
Figure 3 is an elevation of the two parts of the shield or guard detached.
Figure 4 is a section on the line A A.
Figure 5 is a section on the line B B of Figure 3.
Figure 6 is an enlarged detail view.
The same letters of reference are used to indicate the same or corresponding
parts in all the figures.
The top section of the shield or guard is made in the form of a box with
enlarged open ends C1 and C2. The upper part of said box, that is to say, the
part marked C which connects the ends C1 and C2, is made sufficiently large
to enclose that part of the chain which connects the upper parts of the two
wheels, and the ends C and C² are of sufficient size to enclose rather more than
half of each wheel, with plenty of room for the free working of the chain. The
front plate Cs of the end C is extended downwards so as to cover over the
corresponding part of the lower section of the shield or guard. An aperture C
is made in each side of the end C2 of the shield or guard to fit over the pedal
axle, and an elongated aperture or slot C is made in each side of the end C
to admit of the adjustment-relatively to each other-of the driving and pedal
axles when so desired. D and D' are fasteners by means of which the top section
of the shield may be firmly secured to the frame E E of the cycle.
The bottom section of the shield or guard corresponds to the top section
except that it is channel shaped throughout, that is to say, has only three sides,
being open along the top. A removable cover F' is provided for the purpose of
closing in the part F, through which the lower part of the chain runs (see
Figure 5).
To fit a safety bicycle with our shield or guard, the chain is first removed from
the chain wheels by withdrawing the screw provided in the chain for that
purpose and the chain thus opened out in a linear direction. By holding the upper
part C of the guard in a slanting direction, the chain is easily slipped through.
This top section with the chain inside it, is then placed in position on the bicycle
with its slots C and C over the pedal and driving axles respectively, and the
ends of the chain over the chain wheels. When in this position the stay
fasteners D and D' are secured to the frame E, and the top section is now fitted
to the bicycle. The ends of the chain are then connected again in the usual

page_text: manner. The bottom section of the shield or guard may now be placed in position
from underneath the chain, the lower part of which will pass through the open top
of the said section F. The upper parts of the ends of the lower section will
telescope with the lower parts of the ends C1 and C2 of the top section, and the
lower section is secured to the top section by screws passed through the holes G
completely through the shield or guard. The cover plate F¹ is then placed ou
the top of F and secured in position by any suitable means. Preferably we make
this cover plate with side flanges and f³ and spring it into position.
To keep the driving axle as free from dust and dirt as is practicable without
materially increasing the friction thereon, we provide the four wing plates H, two
for each side of the axle. Two of these plates are shewn detached in Figure 6.
Each is provided with an opening H' to fit the axle and with a vertical slot H³.
These plates are put together with their slots H2 coinciding, and a bolt is passed
through these slots through the shield or guard, and two other similar plates are
slipped over the end of said bolt which is then tightened up by a nut and the
whole apparatus is completely fitted. The lower ends of the plates H are quite
free, and will adjust themselves to the varying positions of the axle, the slots H2
allowing the necessary vertical motion of the plates required by such adjustment.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed we declare that
what we claim is :-
1. A. shield or guard for the chains and chain wheels of safety bicycles
consisting of top and bottom sections having a space or aperture between them
to accommodate the stay rod and openings to fit the driving or pedal axles, said
sections partially overlapping at their ends and being bolted together in any
suitable manner, at their overlapping ends, substantially as and for the purpose
hereinbefore set forth and illustrated by the accompanying drawings.
2. A shield or guard for the chains and chain wheels of safety bicycles consisting
of top and bottom sections having a space or aperture between them to accom-
modate the stay rod and openings to fit the driving or pedal axles, said sections
partially overlapping ends and having bolted to the exterior of the top section and
on each side thereof just above the driving axle, wing plates furnished with
openings to fit the driving axle, with means for securing the necessary vertical
movement of the said wing plates as and when the position of the driving axle is
adjusted relatively to the pedal axle substantially as and for the purpose herein-
before described and illustrated.
ת נ.
Oh Darshan 100)
F. W. GOLBY,
36, Chancery Lane, London, W.C., Patent Agent for the Applicants.