Improvements in Cycle and other Chain Driving Gear.
Year: 1895

page_text: Date of Application, 7th Nov., 1895
Complete Specification Left, 7th Aug., 1896-Accepted, 26th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Cycle and other Chain Driving Gear.
We, BENJAMIN SHAW ROBERTS, Cycle Manufacturer, of 40 Bellefield Road,
Winson Green, and WILLIAM MORTON, Manufacturer, of Albert Street,
Birmingham, both in the County of Warwick, do hereby declare the nature of
this invention to be as follows:-
Our invention relates to an improved method of adjusting, tightening, or slackening
cycle and other driving chains."
In carrying our invention into effect in connection with a cycle of the safety
type we arrange a split ring or annular bearing piece within a boss which we carry
from a bracket attached to the chain stay and to the hind fork, the boss being
arranged so that on its outer circumference a clipping block may slide when the
inner split ring or annular bearing piece is moved round. Within the split ring or
annular bearing piece we form a keep or bearing bed for the fixed axle of the hind
wheel to rest in, and we place within the inner portion of the split ring a roller or
cam like piece which rests between the open or split ends of the ring, in such a manner
that when the cam or roller is tightened the ring is expanded and made to bite or
seize upon the inner circumference and thus to be made secure at any desired position.
We carry the roller or cam wedge like piece by means of a clamping fork like bracket
which passes over the outer rim or edge of the boss and has a pin passing through
its ends upon which the cam or roller is placed, and upon the outer ends of this
bracket piece we form a boss through which a tightening or adjusting screw passes
to press down a bearing piece which we place between the jaws of the bracket
and which slides upon the outer face of the main boss.
When the chain wheel axle is placed within the bearing bed on each side we
tighten up the same to any desired position by releasing the screw or screws and
turning the split ring round until the desired degree of tension is obtained when we
screw down the block on to the outer edge and thus force apart the split ends.
may sometimes employ a number of holes within the circumference and we make our
tightening stud to enter within the holes.
We
When arranging for an automatic adjustment we place a spiral or other spring
preferably around the outer end or side of the split ring in such a manner that the
spring will automatically draw up or adjust the chain, when the locking plate is
released. We may use a locking piece on each side of the fork or we may make
one locking device to secure the ring on each side of the wheel in any desired
position.
The application of our invention for the purpose of adjusting the chains of other
driving gears differs in no essential respect from its application to cycle chain
gearing as hereinbefore described.
Dated this 6th day of Narambon 1805
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicants.

page_text: Improvements in Cycle and other Chain Driving Gear.
We, BENJAMIN SHAW ROBERTS, Cycle Manufacturer, of 40, Bellefield Road,
Winson Green, and WILLIAM MORTON, Manufacturer, of Albert Street,
Birmingham, both in the County of Warwick, 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 method of adjusting, tightening, or slackening
cycle and other driving chains.
In order that our invention and the method of carrying the same into effect in
connection with a cycle of the safety type may be the more readily understood,
we append hereunto two sheets of explanatory drawings to be hereinafter
referred to.
On Sheet 1 Figure 1 is a front elevation and Figure 2 a side elevation of the
driving wheel hub and chain wheel arranged in connection with our improved
chain adjusting gear.
On Sheet 2 Figure 3 is a side elevation, and Figure 4 a front elevation of the
split ring or annular bearing piece.
Figure 5 is a side elevation and Figure 6 a front elevation of the forked clamping
bracket.
Figure 7 represents the tightening or adjusting screw.
Figure 8 is a side elevation, and Figure 9 a front elevation of the sliding
bearing piece or clipping block.
Figure 10 illustrates the roller expanding piece.
The same reference letters in the different views indicate the same parts.
We screw the split ring or annular bearing piece A into a boss B which we
carry from a bracket attached to the chain stay C and to the hind fork D, the boss
having an internal screw thread for the reception of A and being so arranged that
on its outer circumference a clipping block E may slide when the inner split ring or
annular bearing piece A is moved round. Within the split ring or annular
bearing piece A we form an eccentric keep or bearing bed a for the fixed axle of
the driving wheel to rest in, and we place within the inner portion of the split ring
a roller or expanding piece F which fits between the open or split ends of the ring
in such a manner that when it is tightened or forced or pressed between such split
ends, the ring is expanded and made to bite or seize upon the inner circumference
of the boss B, and thus to be made secure at any desired position. We carry the
roller or wedge like piece F by means of a clamping fork like bracket G pivotted
to the ring A which passes over the outer rim or edge of the boss B and has a
pin passing through its ends upon which the wedge or roller F is placed, and upon
the outer ends of this bracket piece we form a boss through which a tightening or
adjusting screw H passes to press down the bearing piece or clipping block E
which we place between the jaws of the bracket, and which slides upon the outer
face of the main boss B.
The annular bearing piece A¹ opposite to the bearing piece A is not split but it
is provided with a keep or bearing bed for the fixed axle similar to the keep or
bearing bed a in the split ring or annular bearing piece A.
When the chain wheel axle J is placed within the bearing beds on each side we
tighten up the same to any desired position by releasing the screw H and turning
the split ring A round by using H as a haudle until the desired degree of tension
on the chain is obtained, when we screw down the block E on to the outer edge or
rim of the boss B, and thus force apart the split ends. We may sometimes employ
a number of holes within the circumference and we make our tightening stud to
enter within the holes.

page_text: When arranging for an automatic adjustment we place a spiral or other spring
preferably around the outer end or side of the split ring A in such a manner
that the spring will automatically draw up or adjust the chain when the ring is
released.
We sometimes make each of the annular bearing pieces A A¹ in the form of
split rings with separate blocking or fastening devices, or with one locking device
to secure both rings in any desired position.
The application of our invention for the purpose of adjusting the chains of other
driving gears differs in no essential respect from its application to cycle chain
gearing as herein before described.
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
1. The improved method of adjusting cycle and other driving chains substantially
as described.
2. In cycle and other chain driving gear the use of a split or expansible ring or
annular bearing piece having an eccentric keep or bearing bed, substantially as
and for the purposes hereinbefore described, and as illustrated in the accompanying
drawings.
3. In cycle and other chain driving gear the combination of a split ring or
annular bearing piece such as A screwed within a boss B, with a clipping block or
bearing piece E, a roller or expanding piece F, a bracket G and adjusting screw
such as H, substantially as and for the purposes herein before described and as
illustrated in the accompanying drawings.
Dated this 5th day of August 1896.
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicants.