Improvements in the Back Jaws of Cycles.
Year: 1896

page_text: Improvements in the Back Jaws of Cycles.
I, CHARLES THOMAS BROCK SANGSTER, Works Manager, to The Cycle Components
Manufacturing Company, Limited, of Bournbrook, near the City of Birmingham,
do hereby declare the nature of this invention to be as follows:-
This invention relates to the back jaws of cycle framings fitted at the rear ends
of the back stays and chain stays respectively and wherein the spindle of the back
wheel hub slides and is there affixed after the adjustment of the chain. Heretoforo
such back jaws have been put upon the market as a commercial article with their
junction sockets made either integral with the jaws or brazed in determinatd
positious thereto.
Now by my improvements, these said junction sockets or pieces are loosely
fitted, or in other words, they are supplied loose to the purchasers, with a pin or
rivet passed through holes in the sockets and holes in the branches or solid parts
of a back jaw, thus enabling the said junction sockets to be adapted to varying
angles to suit different framings as may be required.
Thus in carrying out my invention, I take an ordinary slotted back jaw plate,
with the usual extension, to take the hack stay junction socket formed upon its
upper edge. The back stay and chain stay junction lugs or sockets, one of each
of which is carried on each jaw, have their bottom ends made solid, and slotted
with gaps of a breadth about equal to the thickness of the jaw plates, the said
solid ends of the lugs and the parts of the plate whereon they fit being coincidently
cross pierced where-through a pin for temporarily and loosely joining the parts
together is passed. In this condition the back jaws are put upon the market as a
cycle component, and the purchaser, in applying the same to a machine, sets the
lugs at suitable angles according to the rake of the chain and back stays of the
frame which he is building and then brazes them in their determined positions.
Dated this 17th day of November 1896
I, CHARLES THOMAS BROCK SANGSTER, Works Manager, to The Cycle Components
Manufacturing Company, Limited, of Bournbrook, near the City of Birmingham,
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 relates to the back jaw or fork end fittings of cycle framings

page_text: fitted at the rear ends of the back stays and chain stays respectively which said
fittings are carried by the slotted back jaws wherein the spindle of the back wheel
hub slides and is there affixed after the adjustment of the chain. Heretofore such
back jaws have been put upon the market as a commercial article with the fork
ends or junction sockets made either integral with the jaws or brazed in determinato
positions thereto.
Now by my improvements, these said fork ends or junction sockets are tem-
porarily loosely fitted to the back jaws or in other words, they are supplied to the
purchasers, loose but with a pin or rivet passed through holes in them and through
holes in the branches or solid parts of a back jaw, thus temporarily attaching
them to one another, and enabling the said fork ends or junction sockets to be
adapted to varying angles to suit different framings as may be required.
Figure 1 of the accompanying drawing represents a cycle back jaw fitted with
loose fork end fittings or back and chain stay connections according to my inven-
tion. The said fittings are shown as adapted for use with round sectioned back
stays and chain stays.
Figure 2 is a like view as Figure 1, but with the back stay and fitting and the
adjacent part of the jaw in section.
Figure 3 represents the stay end fittings separated from the back jaw plate.
Figure 4 is an edge view of the back jaw plate separately.
Figure 5 is an underside edge view of the back jaw with the stay or fork end
fittings secured thereto.
Figure 6 represents a section and Figure 7 an elevation of a chain stay end
fitting or combined junction lug and socket separately.
Figure 8 is a modification of my invention adapted for use in conjunction
with D-sectioned back and chain stays and
Figure 9 is an end elevation of the same.
The same letters of reference indicate corresponding parts in the several figures
of the drawing.
Thus in carrying out my invention, I take an ordinary slotted back jaw plate a,
with the usual extension a¹, to take the back stay junction lugs or socket b, formed
upon its upper edge . The back stay and chain stay junction lugs or sockets b, b1,
one of each of which is carried on each jaw, have their bottom ends b, made solid,
and slotted with gaps b³, of a breadth about equal to the thickness of the jaw plate,
the said solid ends of the lugs and the parts of the plate whereon they fit being
coincidently cross pierced at, a, respectively where-through pins 65, for tem-
porarily and loosely joining the parts together are passed. In this condition the
back jaws are put upon the market as a separate cycle component, and the pur-
chaser, in applying the same to a machine, sets the lugs at suitable angles
according to the rake of the chain and back stays of the frame which he is building
and then brazes them in their determined positions.
It is understood that a slight clearance is left between the edge of the back jaw
plate and the gap in the socket to admit of the slight angular shearing movement
necessary for the adjustment of the sockets to the angle of the back and chain stay
members, and that after adjustment these spaces are filled up by the solder in
securing the sockets in their set positions by brazing.
In Figures 8 and 9, the corresponding parts are marked with the same letters
of reference as the like parts of the arrangement shown in Figures 1 to 7, from
which the form shown in the said Figures 8 and 9, only differs in respect of the
sectional shape of the sockets.
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 cycle back jaws, temporaly jointedly connecting the fork or stay end fittings
or innction lugs or sockets to the back iaw plate by pivots or bins, so as to admit

page_text: of the said fittings or lugs slightly turning or shearing to or being set in a position
to suit the angles of the back and chain stays of a cycle framing, substantially 38
described and set forth.
CHARLES THOMAS BROCK SANGSTER,
By Henry Skerrett,
24 Temple Row, Birmingham, Agent for Applicant.