Improvements in or connected with Adjustments for Cycle Chains.
Year: 1896

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Comptroller General of the 3rd day of January 1898.
Date of Application, 27th Nov., 1896-Accepted, 20th Mar., 1897
COMPLETE SPECIFICATION (AMENDED).
Improvements in or connected with Adjustments for Cycle Chains.
I, FRIEDRICH WILHELM SPICKERMANN, Manufacturer, of Siegen in the Empire
of Germany, 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:-
This invention for improvements in or connected with adjustments for cycle
chains has for its object to stretch as tight as desired by means of a central set
screw, the driving chain of a cycle which by reason of long usage has become
slack, and without having to, in any way, first loosen the spindle nut as hitherto.
In the accompanying sheet of illustrative drawings Fig. 1 is a part elevation of
the back fork tube of a cycle fitted with an adjustor constructed according to this
invention Fig. 2 is a transverse section and Fig. 3 is a vertical longitudinal section
of the same. Fig. 4 is a detail section.
The central set screw a with the setting head is screwed with its thread
through an inner nut c which is fixed to the outside setting sleeve d by means of
the guide stay k. This setting sleeve d is also provided underneath with a strong
flat projection e having an open slot f also directed downwards, and which receives
the spindle of the cycle wheel, On the opposite top side the collar d is also
provided with a double lug g g to receive the lower flattened end 6 of the top
frame end B to which it is detachably connected by means of the screw nut i.
The setting mechanism above described is pushed in and on the lower frame
tube end A like a sleeve and clamped firmly by the screw nut i being adjustable
by means of the longitudinal slot s's in the axial longitudinal direction of the tube
end, which adjustment is permitted by means of the guide web k of the inner screw
nut c and of the outer setting sleeve d. The set screw head b rests directly on the
opening of the end of the tube A; if it is rotated right or left by means of a
screw driver fitting into the groove on the head h, then the central screw a rotates
and the inner screw nut c and the whole of the adjusting mechanism moves
forwards or backwards. In order that the set screw head itself may not, on being
rotated, move forwards and backwards in the tube end A, a groove m is made in
this head, into which engages the end of the fixed screw n and the set screw head
is thus obliged to retain the position shown, on the rotation of the screw a.
The threaded parts of the adjusting apparatus are by means of the screw head b
closed within the frame tube end A and entirely protected from all external
influences such as rain, dust, and blows; whilst the outer parts do not in any way
disturb the cyclist in travelling, thus the whole adjusting arrangement is simple
and of good appearance.
By means of this novel construction the object is effectively attained of being
able at any time as required to remove the back wheel of the eyele with ease out
of the frame without being obliged to loosen the chain or its connecting screws.

page_text: There is also no necessity as hereinbefore stated to loosen the spindle nut when it
is desired with the new adjusting arrangement to tighten the chain.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I would have it under-
stood that I am aware of the Patent No. 15920 A.D. 1896 granted to John Harper
and Company Limited and Rowland Arthur Tomson and I make no claim to
anything described and claimed therein but I declare that what I claim is:-
1. A chain tightening arrangement fitted in and on the back fork tube A
consisting of a sliding sleeve d with lower slotted lugs e and upper fastening
lugs gg, together with an adjusting arrangement a, c, b, fitted in the tube with
connecting and guide web k, which are all connected together to form the entire
adjusting mechanism and united with the tube end B by means of the nut i.
Dated this 27th day of November 1896.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.