A Detachable Chain or Gear Cover for Velocipedes.
Year: 1893

page_text: Date of Application, 25th Sept., 1893
Complete Specification Left, 25 h June, 1894-Accepted, 28th July, 1894
PROVISIONAL SPECIFICATION.
A Detachable Chain or Gear Cover for Velocipedes.
We ELDEN SHEPHERD COLLINS of 29 Ford Street Coventry in the County of
Warwick, Engineer, and JOHN THOMAS MUSGROVE of 26 Croft Road, Coventry,
in the County of Warwick Tin Worker do hereby declare the nature of this
invention to be as follows:-
The object of this invention is to construct a chain or gear cover for velocipedes
which shall be easily fixed & readily detachable, and therefore divided into two
halves; but in which these balves shall be capable of being so joined, that the
juncture shall be comparatively impervious to dust, mud, & rain or fluid of any
kind.
We find those gear covers to be most readily detachable which are split longi-
tudinally and in a line with the chain stay, the split extending through the apertures
for the crank spindle & for the hub axle: but hitherto in this type of cover no
adequate provision has been made for the exclusion of grit and dust or immunity
of permeation round or about the chain stay at those parts where it protrudes from
the chain cover.
This defect we remedy by building part of the cover round these protruding parts.
Sometimes we fit a detachable cap round these parts, the edges of this cap being so
shaped as to fit into the corresponding grooves, edges or guides fitted to each half
of the cover, so that the cap when slid into position draws both these halves
together and locks itself to them. Sometimes this cap is a permanent fixture to one
of the halves, one edge being provided with a mechanism to lock it to the other
half. Sometimes the longitudinal division of the cover is carried right accross the
cap or caps, so that each half of the cover carries one half of the cap or caps as a
permanent attachment. In this case the same joint is formed between the halves of
the cap or caps as is formed between the halves of the chain cover. The edges of
the cover overlap all the way along, those of the upper half preferably lying inside
those of the lower half. They may be locked by bolt and nuts, by springs by
catches, or by the well known device of a longitudinally grooved slide fitting over
longitudinal grooves on the respective halves of the cover, or by other suitable means.
It is desirable to pad the caps of the chain stay with leather, felt, indiarubber or
other yielding material. These caps sometimes form the main part of the only
clipping arrangement necessary to attach the cover to the machine, and always
afford a sure and steady means of supporting the cover in its proper position.
Dated this 23rd day of September 1893.
ELDEN SHEPHERD COLLINS.
JOHN THOMAS MUSGROVE.
COMPLETE SPECIFICATION.
A Detachable Chain or Gear Cover for Velocipedes.
We, ELDEN SHEPHERD COLLINS, of 29 Ford Street, Coventry in the County
0 of Warwick, Engineer and JOHN THOMAS MUSGROVE of 26 Crott Road, Coventry,
in the County of Warwick, Tin Worker, 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 :-
Our invention relates to an improved detachable chain or gear cover for

page_text: The object of our said invention is to construct a chain or gear cover which shall
he easily secured to and detached from the machine and which is moreover
impervious to dust, mud and rain or fluid of any kind.
Our improved gear case is divided horizontally into two parts and it is an
important feature of our invention that the two parts are so constructed as
to enclose the ends of the chain stay, by which means no grit or dust can work into
the case.
We sometimes provide the case with a detachable cap to fit round the ends of the
chain stay, the edges of said cap being adapted to fit the edges of the cover. In
some instances said cap may be permanently attached to one of the halves of the
cover. We prefer however as hereinafter shewn and described, to divide the cap
longitudinally into two parts one part being secured to each half of the case and a
dust-tight joint being made at the division similar to that used for the remaining
portion of the gear case.
The two parts of the gear case may be secured together by bolts, and nuts,
springs, or catches, or by the well known device of a longitudinally grooved slide
fitting over longitudinal grooves on the respective halves of the cover, or by other
suitable means.
We prefer to pad the joints between the cover and the chain stay
with leather, india rubber or other yielding material.
In order that our invention may be clearly understood we will now proceed to
describe the same with reference to the accompanying drawings in which
Figure 1 is a side view of the gear case when closed.
Figure 2 is a similar view but shewing the opposite side of the gear case.
Figure 3 is a view similar to Figure 2 the two parts of gear case being completely
separated.
Figure 4 is a section on line.
Figure 1.
Figure 5 is a section on line e', '.
Figure 6 is a section on line ³, x².
Figure 7 is a section on line 3, 23.
Figures 8 and 9 are detail views hereinafter explained.
Like letters denote similar parts in all the drawings.
A is the upper half of the gear case and B the lower half.
Referring now more particularly to Figure 1, A', B'₁ are semi-circular recesses
cut in said upper and lower halves respectively through which the crank axle
bracket projects. A3, B2 are recesses for the rear wheel axle, said recesses are
formed of a rectangular shape as shown to fit the fork on the rear end of the chain
stay which admits of the wheel being shifted when the chain is to be adjusted.
D, E are the upper and lower halves respectively of the cap which covers the rear
portion of the chain stay, in the particular form shewn the upper portion D of the
cap overlaps the lower portion E outside as shewn very clearly in Figure 6.
Referring now to Figures 2 and 3 which shew views of the other side of the
case D', E are the upper and lower portions respectively of the cap which encloses
the forward end of the crank stay, D, E being semicircular recesses for receiving
the short transverse stay which joins the chain stay parallel to the bottom bracket.
The upper portion D' of this cap is prolonged into a semicircular collar F which
fits round the upper part of the bottom bracket, and the lower portion E' is similarly
prolonged as shewn at F' to fit the lower part of said bracket. We prefer to pad
the end of the cap D' E' and the collar F F with leather or other yielding material
as shewn at G.
Outside the upper collar F and concentric therewith we secure a spring H which
has a projecting slotted end H. A similar spring I is secured to the lower collar F
the end I' of said spring is furnished with a screw J adapted to enter the slotted
end H of the upper collar so as to clamp the ends of the springs. Said screw when
screwed up as shewn in Figure 2 causes the collars F F to grip the bottom bracket
very tightly and secures the two halves of the gear case together.
The opening for the rear wheel axle to pass through on this side of the gear case
is somewhat oval in form as shewn at A, B, and each half of the gear case is

page_text: furnished with two slides K, L the sides of the gear case being made double at this
part so as to receive said slides which can move longitudinally relative to the sides.
of the case.
Said slides one of which L is shewn in Figure 8 are furnished with
semi-circular recesses such as L' which fit the rear wheel axle. The inner side of
the gear case is shewn at L' Figure 8 and also in Figure 9 which is a back view of
the device shewn in Figure 8. Said inner side has portions of its edges turned in
as shewn at L and folded over the edges of the slide L. The part L is secured'
by its edges to the inside of the gear case as shewn in dotted lines in Figure 3.
The slides K and L have extensions K', L' which project through slots in the end
of the gear case, by means of which extensions said slides can be manipulated from.
the exterior of the case.
In order to make the joint between the two halves of the case dust-tight the
edge of the upper half is made double as shewn at A, A' Figures 4 to 7 and
receives the lower edge B of the case. All the edges are preferably grooved as
shewn at A, B°. M, M are screws which pass through the halves of the case and
screw into nuts M¹, M' on the other side so as to prevent the case bulging at the
sides. We provide an orifice near the bottom of the case covered with a screw
cap N through which oil can be poured into or out of the case if desired, when the
case is secured to a machine.
O is a pin secured to the lower half of the case which engages in a hole in the
upper half and holds the rear portions of the case together.
When the case is to be secured to a machine the slides K, L are manipulated
until the orifice A', B' and the semi-circular recesses in said slides are the correct.
distance apart to fit the machine. The two halves of the case are now fitted
together, the pin being inserted in the hole and the two ends of the springs H
and I secured together by means of the screw J. Care must be taken that the
edge B of the lower half is properly received between the edges A*, A³ of the
upper half of the case.
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 gear case provided with caps for enclosing the ends of the chain stay,.
substantially as, and for the purposes, specified.
2. Such a gear case fitted with a slide or slides through or between which the
rear wheel axle passes, substantially as, and for the purpose, specified.
3. A gear case having its two halves joined together in the manner described for
the purpose specified.
4. A gear case constructed substantially as described with reference to the
accompanying drawings.
Dated this 22nd day of June 1801
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants..