IMPROVEMENTS IN DETACHABLE DRIVE CHAINS
Year: 1884

page_text: JOHN HARRISON of Thirsk in the County of York Engineer do hereby declare
the nature of my invention for IMPROVEMENTS IN DETACHABLE DRIVE CHAINS to
be as follows:-
Firstly to construct a clip for drive chains in such a manner so that any ordinary
oblong or square link, without any projections or depressions formed upon it; can
be coupled up when placed at an angle which they will not assume when in work,
and when coupled up are held together, in any ordinary position which they will
assume whilst in work as a drive chain.
Secondly, to construct a link to be used in combination with a clip so that by
changing it position in the clip the pitch of chain may be adjusted.
I will now proceed to describe with reference to the accompanying drawing the
manner in which my improvements may be carried into effect. I make the two
ends b and b¹ of clip A.; to form an irregular shaped slot just wide enough to allow
the link to pass for coupling when placed in position shown at the right hand side
of drawing; The links are slided in laterally the side bar & following the irregular
shape of the Blot, the links can then be turned in the clip; to position shown in
drawing which couples them together, and quite free to assume any working position
without the possibility of them coming uncoupled.
To adjust the pitch of chain I make the the links what I call slightly oblong thab
is to say, the bars d and dare a little farther apart than the bars c and c¹, and I
adjust the pitch by turning the links so that the clip takes hold of bars c and cl
instead of the bars d and d¹ this position is shown in dotted lines at the right hand
side of the drawing..

page_text: I, JOHN HARRISON of Thirsk in the County of York Engineer do hereby declare
the nature of my invention for IMPROVEMENTS IN DETACHABLE DRIVE CHAINS and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
Firstly to construct a Clip for drive chains in such a manner so that any ordinary
oblong or square link without any projections or depressions formed upon it, can
be coupled up when placed at an angle which they will not assume when in work
and when coupled up are held together in any ordinary position which they will
assume whilst in work as a drive chain.
Secondly to construct a link to be used in combination with a clip so that by
changing its position in the Clip the pitch of chain may be adjusted. I will now
proceed to describe with reference to the accompanying drawing the manner in
which my improvements may be carried into effect I make the two ends b and b¹
of Clip A. to form an irregular shaped slot just wide enough to allow the link to
pass for coupling when placed in position shown at the right hand side of drawing.
The links are slided in laterally the side bar d. following the irregular shape of the
slot the links can then be turned in the Clip to position shown in drawing which
couples them together and quite free to assume any working position without the
possibility of them coming uncoupled. To adjust the pitch of chain I make the
links what I call slightly oblong that is to say the bars d and d' are a little farther
apart than the bars c and c¹ and I adjust the pitch by turning the links so that
the Clip takes hold of bars c and c¹ instead of the bars d, and d¹ this position
is shown in drawing in dotted lines. Having now particularly described and
ascertained the nature of my said invention and in what manner the same is to be
performed I declare that what I claim is
Firstly shaping the two ends of a Clip for drive chains in such a manner so that
they form an irregular shaped slot just wide enough to allow the links to be coupled
up when placed in certain positions, which they will not assume when in work as
substantially shown and described.
Secondly, constructing a link for drive chain slightly oblong for the purpose of
adjusting the pitch, as substantially shown and described.
Thirdly. The combination of link and Clip for the purpose as substantially shown
and described.
Dated thie 19th dev of November 1884