Improvements in Frames for Pneumatic or other Large Tyred Cycles.
Year: 1897

page_text: Date of Application, 15th Oct., 1897
Complete Specification Left, 11th July, 1898-Accepted, 1st Oct., 1898
PROVISIONAL SPECIFICATION.
Improvements in Frames for Pneumatic or other Large Tyred
Cycles.
THOMAS SLACK, Cycle Manufacturer, Wellington Machine Works, Stockport,
and THOMAS WHITAKER, Manager, 5, Church Street, Heaton Norris, Stockport,
in the County of Cheshire, do hereby declare the nature of this invention to be as
follows:
This invention relates to improvements in the construction of frames for pneu-
matic or other large tyred cycles whereby the back wheel is brought closer to
the bottom bearing bracket than usual, thus allowing the seat pillar tube to be
made in a more perpendicular position than usual, and at the same time that the
back wheel is brought closer up to the bearing bracket and seat pillar tube, the
back compression stays are no longer than usual, and ample clearance is left for
the rim and tyre of the back wheel to pass the back forks, with a tread of five and
a quarter inches or a less tread, the tread being the length of the crank shaft.
În machines constructed on the ordinary plans generally used for cycles the
back forks are hollow and brazed or coveniently fastened to two or more lugs
on to the bearing bracket, with the result that when a five and a quarter inches
tread, or a less tread, is used, the back wheel cannot be brought forward closer to
the bearing bracket, as the rim and tyre of the back wheel will not pass through
the back forks, or be provided with ample clearance.
In cycles constructed in accordance with this invention the bearing bracket has
solid extended lugs on both sides of the rim and tyre of the back wheel, (if pre-
ferred these lugs can be flat with a strengthening web on), in one piece with the
bearing bracket, and the back forks conveniently fastened to these extended lugs.
when these lugs have cleared the chain wheel of the machine.
The extended lugs can be in one piece with the bearing bracket, or in one piece
with the back forks, or separate to both the bearing bracket and the back forks,
in any of which cases they are fastened together by brazing or any other con-
venient manner.
Dated this Fourteenth day of October 1897.
CUMI LEIE
Improvements in Frames for Pneumatic or other Large Tyred
Cycles.
We, THOMAS SLACK, of Wellington Machine Works, Stockport, in the County of
Chester, Cycle Manufacturer, and THOMAS WHITAKER, of 5, Church Street, Heaton
Price 8d.]

page_text: Norris, Stockport aforesaid, Cycle Works Manager, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
This invention relates to improvements in the construction of frames for pneu-
matic or other large tyred cycles, such as safety bicycles, with a five and a quarter
inches or a less tread (the tread being the length of the crank axle).
The object of our invention is to so construct the bottom back forks that the back
wheel can be brought closer to the bottom bearing bracket than usual, also to allow
the seat pillar tube to be built in a more perpendicular direction than usual, thus
placing the rider of the cycle in the same forward position by the use of a straight
seat pillar as he would be by the use of a forward 1 seat pillar, and at the same
time with the back wheel being brought nearer the bottom bearing bracket, the
back wheel is brought more under the rider's weight.
In machines constructed on the ordinary plan generally used for safety bicycles,
the bottom back forks are hollow, and are brazed or conveniently fastened to lugs
in the bottom bearing bracket of the safety bicycle, the seat pillar tube is built
almost parallel to the ball head. The bottom back forks are usually so con-
structed that the back wheel cannot be brought closer to the bottom bearing
bracket so that the distance between the centre of the back wheel and the centre
of the crank axle is less than eighteen inches (in the case of the back wheel being
twenty eight inches diameter) as there would not be sufficient clearance for the
back wheel tyre and rim to pass through the bottom back forks, and to provide
clearance for the chain wheel, with a tread of five and a quarter inches or a less
tread.
•
And in order that our invention may be more fully understood we have caused
to be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures, Fig. 1 being a side view of a safety
bicycle having a frame constructed in accordance with our invention. Figs. 2 & 3
are respectively at an enlarged scale a side view and plan partly in section of our
improved bottom bearing bracket and Fig. 4 a side view of a modification thereof.
In carrying out our invention and referring to Figs. 1, 2 & 3, we form or furnish
the bottom bearing bracket a with two solid extended lugs b (the term solid
extended lug is meant to cover any form of lug other than tubing) one on either
side of the rim and tyre of the back wheel.
when
This lug may be flat or of any other convenient shape, with a strengthening
web e on in preference, the bottom back forks d being fastened to the lugs
the lug has cleared the back wheel tyre, rim and chain wheel of the cycle.
According to one form of our invention the lugs b may be cast or forged in one
piece with the bottom bearing bracket a, as shown in Figs. 1, 2 & 3, or each lug
in one piece with each side of the bottom back forks, or separate from both the
bottom bearing bracket a and the bottom back forks d, for instance as shown in
Fig. 4, in any of which cases they are fastened together in any convenient manner,
say by brazing or by means of screws.
These extended lugs with being made flat and solid can be made so thin as to
allow the back wheel to be brought nearer to the bottom bearing bracket, see Fig. 1,
by shortening the bottom back forks, so that the centre of the back wheel and the
centre of the crank axle is seventeen inches or less, (in the case of the back wheel
being twenty eight inches diameter) and the seat pillar tube can be built in a more
perpendicular direction without making the back compression stays longer than
usual.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim, is:-
5
In pneumatic or other large tyred safety bicycles, the bottom bearing bracket a
having solid extended lugs b, as herein before described, one on either side of the 5
rim and tyre of the back wheel, to allow clearance with a five and a quarter inches

page_text: or a less tread, for the back wheel tyre, rim and chain wheel, whereby a back
wheel can be brought forward close up to the bottom bearing bracket, and the seat
pillar tube built in the frame of the cycle more perpendicular than the ball head
tube.
Dalad h
021
J
T 1
1000
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicants.