Improvements in Chain Driven Bicycles.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Chain Driven Bicycles.
I, EDWARD HARNETT, of St. Peter's Cottage, Usk Road, Battersea, in the County
of London, Mechanical Engineer do hereby declare the nature of this invention
to be as follows:-
My invention consists of improvements in chain driven bicycles, the objects
of such improvements being to provide a simple and effective means for adjusting
the tension of the chain and also for enabling the driving wheel to be instantly
removed from the frame of the machine when desired without interfering with
the chain adjustment..
According to my invention, the fork ends are secured within the ends of the top
back stays, being suitably brazed, rivetted or otherwise fastened. The two slots
which receive the axle are nearly vertical, being preferably inclined very slightly
so that the wheel may be free to drop out from the fork ends upon the axle nuts
being loosened.
The chain adjustment consists of a right and left handed threaded piece inter-
posed between the fork end and the chain stay. For this purpose, I pivot or
otherwise attach to each fork end plate a lug, flattened at its point of attachment,
but otherwise circular in section, and about one and a half inches, more or less,
in length. This lug projects horizontally towards the chain stay, the latter being
somewhat shorter than usual. I bore and tap the lug lengthwise for about one inch
or more, and I fit an oppositely tapped lug within the open end of the chain stay,
security being provided by brazing and pinning or other well known means.
I now introduce between the lugs above mentioned the said right and left
handed threaded piece, provided with an intermediate gripping portion adapted to
be turned in either direction by any suitable tool for such purpose. I also provide
lock nuts, one upon each threaded part of the bolt or piece, whereby the adjustment
may be locked in position after having been adjusted. The distance between the
axle and the bottom bracket can thus be regulated within required limits by
turning the adjustment bolts in one direction or the other.
Doted this 20th day of Wahmim 1900

page_text: and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement: —
My invention consists of improvements in chain driven bicycles, the objects
of such improvements being to provide a simple effective means for adjusting
the tension of the chain and also for enabling the driving wheel to be instantly
removed from the frame of the machine when desired without interfering with
the chain adjustment.
And in order that my invention may be understood I will describe the same
with reference to the drawing. accompanying this specification which shews con-
nection between the back fork and the chain stay.
The fork ends a are secured within the ends of the top back stays, being
suitably brazed, rivetted or otherwise fastened. The two slots which receive the
axle are preferably slightly inclined, to the vertical, so that the wheel may be free
to drop out from the fork ends upon the axle nuts being loosened.
The chain adjustment consists of a right and left handed threaded: piece.c, inter-
posed between the fork and a and the chain stay d. For this purpose; I pivot
or otherwise attach to each fork end plate, a lug e, flattened at its point of attach-
-ment, but otherwise circular in section, and about one and a half inches more or
less, in length. The lug e-projects-horizontally towards the chain stay d, the
latter being somewhat shorter than usual. I bore and tap-the-luge lengthwise
for about one inch, more or less, and I fit an oppositely tapped lug or sleeve f¹,
within the open end of the chain stay, security being provided by brazing or
pinning or otherwise..
I now introduce between the lugs e-and-f-the-right and left handed threaded
piece provided with an intermediate gripping portion 9 adapted to be turned-in-
either direction by any suitable tool for such purpose I also provide lock nuts h,
one upon-each-threaded part of the bolt or piece, whereby the adjustment may be
locked in position. The distance between-the_axle and the bottom bracket
can thus be regulated within required limits by turning the adjustment-bolts.c.in
one direction or the other.
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:
-
In chain driven bicycles, dividing the chain stay and connecting the divided
portions together by means of a right and left handed screw, provided with lock
nuts, all for the purpose set forth.
Dated this 24th day of November 1899.
'BROWNE & Co.,
Agents for the Applicant,
9, Warwick Court Gray's Inn, London, W.C.