Improvements in the Frames of Safety Bicycles.
Year: 1896

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Pateuts, &c., Act, 1883), as required
by the decision of the Chief Examiner of the 21st day of December 1896.
Date of Application, 4th Feb.. 1896-Accepted, 27th June, 1896
COMPLETE SPECIFICATION (AMENDED).
Improvements in the Frames of Safety Bicycles.
"
We, "THE TRENGROVE IMPROVED CYCLE FRAME COMPANY, LIMITED,"
of 133, Lichfield Street, and WILLIAM HENRY TRENGROVE, Cycle Manufacturer,
of Victoria Street, both of Christchurch, in the Provincial District of Canterbury,
in the Colony of New Zealand, 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 frames of safety bicycles and provides the following
improvement therein:
The back stays and forks carrying the driving wheel are adjustably connected.
to and detachable from the forward part of the frame carrying the steering
wheel so that the wheels may be separated when it is desired to pack the machine
for transport.
The form of connection allows the parts of the frame to be readily adjusted to
regulate the tension upon the driving chain.
Referring to the accompanying drawings:
Fig. 1 is a side elevation of a bicycle with a frame constructed with this
improvement.
Fig. 2 is a side elevation, and
Fig. 3 an inverted plan of the bottom bracket and connection.
Similar letters of reference indicate the same parts in all the figures.
The bottom bracket (a) is of the usual form but is provided with the tubular
extension or socket (b) which has a longitudinal saw cut (b).
The back forks (c) (d) are connected in the T head (e) the stem. (f) of
which slides within the socket (b) and is screwed and provided with the milled
nut (g).
The gland or clip (4) surrounds the socket (b) and has a screw (i) to draw
the ends together so as to compress the socket (6), and clamp the stem (f)
within it.
Brackets (one of which (k) is shown) are employed to connect the back forks to
the back stays (e) upon either side of the machine, each bracket being bored to
receive opposite ends of the bearing spindle (m).
The upper ends of the back stays are provided with eyes (p) by which they
are connected to the forward part of the framing by a bolt (n) which passes
through them, and also through lugs upon an ordinary gland upon the seat
pillar tube.

page_text: To disconnect the frame, the gland (h) is slackened and the nut (g) screwed
back to enable the stem (f) to pass further into the socket (b) and allow the
driving chain to be thrown off the chain wheels, the bolt (n) is removed from the
eyes (p) upon the ends of the stays (e) and the parts easily separated.
To adjust the frame to regulate the tension upon the driving chain, a nut
upon the bolt (n) is unscrewed and the gland (h) slackened. The milled nut (9)
which may have holes to receive a spanner; is then turned to move the stem (f)
out of, or allow it to move into, the socket (b) as may be required, finally the
gland (h) is screwed up and the saw cut (1) allows the socket to be
compressed to clamp the stem (f) within it, the nut upon the bolt (n) is then
screwed tight.
We have described what we consider the best method of carrying our inven-
tion into practice but it is possible to employ several modifications having the
same result, for instance; we might provide the tubular extension (b) with an
external screw thread and employ a screwed socket to adjustably connect it to the
stem (f).
Cycle engineers will readily understand how our invention might be conveniently
employed upon a machine which would be capable of conversion into an "ordinary"
or a "tanden" bicycle as desired.
We are aware of Sharp's Specification No. 13,614 of 1889; and of McHardy's
No. 5532 of 1891; and of Lovelace's No. 18,474 of 1891, but we do not claim
anything described and claimed. therein.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1. A bottom bracket having a tubular projection or socket, the stem of a T head
upon the back forks sliding within such socket and being secured therein by a
gland or clip substantially as and for the purposes herein described and illustrated
in the accompanying drawings.
2. In combination the tubular projection or socket formed upon the bottom
bracket, the T head upon the back forks, the gland or clip upon the socket and
the nut upon the screwed stem of the T head substantially as and for the purposes
herein described and illustrated in the accompanying drawings.
Dated this 20th day of December 1895.
FAIRFAX & WETTER,
433 Strand, London, Agents for the Applicants.