Improvements in Cycle Chain Adjustments.
Year: 1889

page_text: Date of Application, 1st Mar., 1889
Complete Specification Left, 28th Nov., 1889-Accepted, 1st Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in Cycle Chain Adjustments.
I RICHARD GREEN of Kirton Grantham Road Smethwick in the County of Stafford,
Mechanician, do hereby declare the nature of this invention to be as follows:-
These improvements in Chain adjustments relate to a novel construction and means
of taking up the wear of Chains or Bands used on or for the purpose of driving Cycles.
I will now describe the construction and method of my new invention. Firstly: I
construct a fork of iron, stoel, or other suitable metal, and having suitably formed
its two ends, I drill, or bore, or slot a hole through each end for the purpose of putting
on, or fixing same to the driven or stationary axle which carries the driven wheel,
which axle moves or slides in slots formed horizontally and connected with the frame
of Cycle: On the other end of fork and directly in the centre of what is commonly
called the crown of the fork I insert or fix a screwed pin or shaft of suitable length
and size, and upon which I place two screwed nuts. I then construct out of iron,
steel, or other suitable metal what is commonly called a bracket having at one end a
boss of suitable formation with a hole running horizontally through it of suitable size
to receive the screwed pin or shaft of the fork above described. On the other end of
the bracket is formed in a convenient manner a clip made in two parts and by means
of screws or bolts made to clip on what is commonly called the down pole or tube
carrying the bearing bracket for the driving or crank shaft of a Cycle. The clip bracket
with its boss on the one end as above described. I then fix to the down pole or tube
carrying the bearing bracket for the driving or crank shaft of Cycle and I put through
the horizontal hole in the boss of the clip bracket above described, the screwed pin or
shaft of the fork with its screwed nuts, one nut being on each side of boss formed on
end of clip bracket. I am thus able to move horizontally backwards and forwards the
Fork above described and also lock same. I then put or fix the formed ends of the
Fork above described with their holes or slots on to the driven or stationary axle which
carries the driven wheel which moves or slides on slots formed horizontally and con-
nected with the frames of Cycles. It will be seen by unscrewing the one nut and
screwing up the other nut which are on the screwed pin or shaft of fork above
described that it will move the driven or stationary axle which carries the driven wheel
along the slotted ends which support the ends of the driven or stationary axles carrying
the driven wheel, thus taking up any looseness that may occur by the wear of the
chain or band, or any parts connected therewith and moving the axle evenly in each
slot thus keeping the wheels always lineable. It is evident that instead of using the
split or detachable bracket as above described, the screwed pin or shaft may be passed
through or connected with a boss forming a continuation of down pole or tube of
machine. Again, in some cases I may fix my new adjusting fork to the driven or
stationary axle carrying the driven wheel when such driven or stationary axle does
hot slide in the slotted ends which are fixed or attached to machine. This result I
obtain by means of the adjusting fork being applied vertically instead of horizontally
as above stated. The vertical fork is constructed same as horizontal fork previously
described except that instead of terminating where the holes connect it to the frame of
ycle, the two sides are extended for a suitable distance and the extreme ends are
ormed in suitable manner and holes are provided to carry the driven axle, or in place
of the holes, bearings might be attached to carry a revolving axle. At the top end of
his vertical fork is placed a boss with horizontal hole. Through this hole a radial
od passes secured at one end to the frame of Cycle, thus forming a guide along which
he vertical fork moves, and secured in position by means of set pin. When the
ertical fork is moved along the radial rod, as its centre or fulcrum is fixed to the
rame of Cycle, the extended rods above referred to will also move in a contrary

page_text: direction and thus move backwards and forwards as required the driven axle at same
time. It will be seen this arrangement will take up any looseness that may arise by
wear or stretching of chain or band.
1000
RICHARD GREEN.
COMPLETE SPECIFICATION.
Improvements in Cycle Chain Adjustments.
I RICHARD GREEN of Kirton Place Grantham Road Smethwick in the county of
Stafford Mechanician 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 :-
These improvements in chain adjustments relate to a novel construction and means
of taking up the wear of chains or bands used on or for the purpose of driving Cycles.
I will now describe the construction and method of my new invention. Firstly : 1
construct a fork of iron, steel, or other suitable metal, and having suitably formed
its two ends, I drill, or bore, or slot a hole through each end for the purpose of putting
on or fixing same to the driven or stationary axle which carries the driven wheel,
which axle moves or slides in slots formed horizontally and connected with the frame
of Cycle. On the other end of fork and directly in the centre of what is commonly
called the crown of the fork I insert or fix a screwed pin or shaft of suitable length
I then construct out of iron,
and size, and upon which I place two screwed nuts.
steel, or other suitable metal what is commonly called a bracket having at one end a
boss of suitable formation with a hole running horizontally through it of suitable
size to receive the screwed pin or shaft of the fork above described. On the other
end of the bracket is formed in a convenient manner a clip made in two parts and by
means of screws or bolts made to clip on what is commonly called the down pole or
tube carrying the bearing bracket for the driving or crank shaft of a Cycle. The clip
bracket with its boss on the one end as above described, I then fix to the down pole or
tube carrying the bearing bracket for the driving or crank shaft of Cycle, and I put
through the horizontal hole in the boss of the clip bracket above described, the
screwed pin or shaft of the fork with its screwed nuts, one nut being on each side of
boss formed on end of clip bracket. I am thus able to move horizontally backwards
and forwards the fork above described and also lock same. I then put or fix the
formed ends of the forks above described with their holos or slots on to the driven or
stationary axle which carries the driven wheel which moves or slides in slots formed
horizontally and connected with the frames of Cycles. It will be seen by unscrewing
the one nut and screwing up the other nut which are on the screwed pin or shaft of
fork above described, that it will move the driven or stationary axle which carries the
driven wheel along the slotted ends which support the ends of the driven or stationary
axles carrying the driven wheel, thus taking up any looseness that may occur by the
wear of the chain or band, or any parts connected therewith and moving the axle
evenly in each slot thus keeping the wheels always lineable. It is evident that instead
of using the split or detachable bracket as above described the screwed pin or shaft
may be passed through or connected with a boss forming a continuation of down pole
or tube of machine. Again in some cases I fix my new adjusting fork to the driven
or stationary axle carrying the driven wheel when such driven or stationary
axle does not slide in the slotted ends which are fixed or attached to machine. This
result I obtain by means of the adjusting fork being applied vertically instead of
horizontally as above stated. The vertical fork is constructed same as horizontal fork
previously described, except that instead of terminating where the holes connect it to
the frame of cycle, the two sides are extended for a suitable distance and the extreme
ends are formed in suitable manner and holes are provided to carry the driven axle
or in place of the holes, bearings might be attached to carry a revolving axle. At the
top end of this vertical fork is placed a boss with horizontal hole. Through this hole

page_text: a rod curved, so as to be concentric with wheel, passes secured at one end to the frame
of Cycle, thus forming a guide along which the vertical fork moves and secured in
position by means of set pin. When the vertical fork is moved along the curved or
concentric rod, as its centre or fulcrum is fixed to the frame of Cycle, the extended
rods above referred to,' will also move in a contrary direction and thus move the
driven axle backwards and forwards as required at same time. It will be seen this
arrangement will take up any looseness that may arise by wear or stretching of chain
or band.
My invention will be fully understood by reference to the accompanying drawings.
Figs. 1. 2. & 3 represent side elevations of Safety Bicycles with my improved chain
adjustments. Fig. 4 represents an end view of bottom bracket.
In Figs. 2 & 3 a is the new horizontal adjusting fork, the holes which carry the
driven axle c; d the crown of fork, e the screwed pin or shaft. In Fig. 2, is the
bracket which is detachable and can be therefore applied to any existing machine,
the upper parts being constructed in two parts to clip the down pole h. The screwed
pin or shaft e is passed through the lower part of bracket. The opposite ends of the
fork are fitted on to the driven or stationary axle c and the method of adjusting the
driven or stationary axle will be at once understood, since the nuts on the screwed
pin or shaft, will allow the fork to move horizontally as may be required.
Fig. 3 shows a method by which the split or detachable bracket is dispensed with,
and instead, the bottom bearing lug i has a continuation j, to which the adjusting fork a
is applied as above. This method can only be adopted in machines specially constructed
for same.
Fig. 1 shows another arrangement when the fork is applied vertically and the driven
or stationary axle does not slide in a slot as above described. The vertical fork k is
pivotted upon the centre of back frame 1 but it is carried below this centre to m where
the driven axle, carrying the backwheel, is mounted. At the top of this vertical fork
there is a boss n with horizontal hole through which a curved or concentric rod o
passes, this curved or concentric rod being a continuation of frame. The boss n is
split or sawn through at the upper end and it can therefore be tightened up in any
position on the curved or concentric rod by the pin and nut p and by this means any
adjustment of chain which may be necessary can be readily performed.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed I declare that what 1
claim is:
1. The application of the horizontal adjusting fork a and detachable bracket to
cycles already in use, such horizontal adjusting fork and detachable bracket being
constructed in the manner herein before described as shown in Fig. 2, or any modi-
fication thereof embodying the principle of the invention.
2. The construction and application of the horizontal adjusting fork a to cycles
specially constructed for same as shown in Fig. 3 or any modification thereof embodying
the principle of the invention.
3. The construction and application of the vertical adjusting fork k to cycles as
shown in Fig. 1 or any modification thereof embodying the principle of the
Invention.
Dated this 26th day of November 1889.
RICHARD GREEN.