IMPROVEMENT IN BICYCLES
Year: 1884

page_text: I, HERBERT JOHN HADDAN, of the firm of Herbert and Company, Patent Agents,
of 67, Strand, in the City of Westminster, Civil Engineer, do hereby declare the
nature of my Invention for IMPROVEMENT IN BICYCLES, and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
In the accompanying Drawings :
Fig. 1 is a side elevation.
Fig. 2 a front end view of a bicycle provided with this Invention, the nature of
which is defined in the claim or claims hereinafter presented.
Fig. 3 is a transverse section on an enlarged scale taken through the axis of the
large wheel and also through the steering mechanisin shafts to be described.
Fig. 4 is a front view on an enlarged scale of one of the toothed racks e, its
operative sector and the actuating gear of the latter.
Fig. 5 is a side view of one of the duplex cranks of the pedals.
Fig. 6 is a vertical and longitudinal section on an enlarged scale of the connecting
rod t, and its latch for connecting such rod with the inner duplex crank.
Fig. 7 is a horizontal section of the said crank, latch and rod, while
Fig. 8 is a perspective view of the latch.
Fig. 9 is a vertical and transverse section of the handle bar m and its supporting
abutment, while
Fig. 10 is a longitudinal section of the abutment, and the upper part of the
frame E.
Fig. 11 is a front side elevation,
Fig. 12 an inner side elevation, and
Fig. 13 a top view of the sustaining devices of one of the auxiliary cranks pl.
The bicycle is of a class termed "Tandem Bicycles" it being calculated for two
persons to sit one in rear of the other upon it and to operate it. To this end it
has two seats A and B, arranged over its main wheel C, such seats resting on
springs a, arranged as shown in Fig. 1 and properly supported by the frame E,
that straddles the said wheel C.

page_text: The auxiliary or steering wheel D, is shown as arranged in front of the said
main wheel, and having its journals supported in a fork F, whose shank is adapted
to turn in the frame E. From the prongs of the fork two arms b are projected in
opposite directions, as shown in Fig. 2, cach being jointed to one of two inclined
rods c, that extend into tubular portions d, d, of the frame E. Each of such rods,
has at its upper end or part a. toothed rack, as shown at e, in Fig. 1, and also in
Fig. 4.
A toothed sector f properly pivoted to the frame E, and arranged over
cach rack, engages with the said rack and is provided with a bevel gear g, to mesh
into a bevel pinion h, fixed on a shaft i, such shaft being suitably journalled in the
frame u¹. The upper portion of each shaft i is bent, horizontally and provided
with a bandle as shown in Fig. 2.
A wheelman when sitting on the seat A is with his two hands to take hold of
the two handles l, and by moving them to turn the shafts i, he can turn the
wheel D, more or less laterally either way out of the plane of the wheel C, so as
to change the direction of the advance of the bicycle.
Between the two seats is a detachable transverse bar m, terminating in
handles m, n, for the person who may occupy the rear seat to lay hold of to support
himself, while his feet may be on the pedals the cranks p of the, shaft g of the
main wheel. Each of the said cranks is a double or duplex crank it being formed
as represented in side view in Fig. 5, in which it is shown formed so as to have
two wrists r, s, the outer one of which is for supporting the pedal, while there is
pivoted on the inner one ra rod t, which in like manner applied to the corre-
sponding wrist of another such duplex crank p', which is supported by a bracket u,
extending upward from the frame E. There is such a bracket u and duplex
crank p', on each side of the wheel C, pedals o¹, being applied to the cranks p
On the pedals o¹, the feet of the rider of the front seat A are to rest. As the
cranks p¹, are revolved, they through the connecting rods t, and the cranks p,
revolve the wheel C, the said cranks p, being further acted on by the feet of the
party who may be upon the rear seat B.
Each connecting rod t is forked, and straddles the wrist r, of the crank p, in
manner as shown in Fig. 6 and such rod has hinged to it, a shoe or latch A¹,
notched to receive the wrist of the crank, when the latch is down as shown in
Fig. 6. On raising the latches out of engagement with the wrists the cranks may
be revolved without removing their connection rods lengthwise, in which case, the
-feet of the front rider may rest on the front pedals without turning them or their
cranks. This is useful while the bicycle is descending a hill or declivity.
The shafts i, i, are journalled in a head or frame u', adapted to slide on the
frame E, lengthwise thereof, and provided with screws or suitable means of clamping
it, the said frame.ul, in position. The object of having the frame u¹ so movable, is
to enable the seat A to be arranged between the wheel D and the steering arms k,
when such wheel is to track in rear of the main wheel.
To one or each of the auxiliary duplex cranks p₁ there is fixed a notched
wheel V, and to its bracket a pawl w, to engage with such wheel, so as to prevent
the front crank from having a pendulous motion while the rear crank might be in
revolution, as the two cranks should revolve simultaneously in an entire circular
path.
The bracket u, see Fig. 11, 12 and 13, is clamped on the tubular part d of the
frame E, the clamp with its screw being shown at a in Figs 11 and 12, such
enabling the bracket to be adapted to project either above or below the part d. The
crank box b' is adjustable on the bracket, that is, adapted to slide upwards or
downwards, on the bracket which is cylindrical above its clamp a' going through
the box, such box having a screw c', for clamping it to the bracket.
From the above it will be seen that the crank p' is adjustable up or down
relatively to the bracket, such being to properly adjust the pedal to the foot of the
wheelman,
5

page_text: From the above it will also be seen that when two persons are occupying the
seats A and B, with the feet of one on the main or rear pedals, and that of the
other on the auxiliary or front ones, they can put the bicycle in motion forward,
and the front person can steer it either in a straight or in a curved. direction, as
occasion may require.
3
Each shaft slides longitudinally in the hub of its bevelled pinion h, and such
hub has in it a set screw y, to clamp the pinion to the shaft, see Fig. 3.
Furthermore, each shaft i, extends up through a tube z, arranged as shown
within the frame ul. A clamp screw a³, screwed into the tube laterally and
against the shaft, serves to confine the tube to the shaft. The object of the tube,
arranged on the shaft i, and within the frame u', in manner as shown in Fig. 3,
and having the bevelled pinion movable on the shaft i, is to enable the handles of
the shafts i, i, to be adjusted to such height as may be most convenient for a rider
to hold and operate them.
3=
The bar m of the handles n, n, is supported at its middle in the head of a short
post f, which at its foot is inserted in a socket in the base of an abutment c²,
extending up from the frame E. This abutment has a hole d², through it to receive
a stud e, projecting from the post, all being as shown in Fig. 9. The bar m with
its handles becomes readily detachable from the frame E or applicable thereto as
occasion may require.
Each shaft i, at its lowest part, extends through and turns in a box 66, that is
pivoted in. the frame E, so as to turn therein with the shaft, when the latter is
moved with the frame u¹, while the said frame may be in the act of being adjusted
in the frame E. The toothed sector f turns or is pivoted on the pivotal shank c" of
the box 66.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I hereby declare that
what I claim is :-
1. The combination of the main wheel and its duplex cranks, the frame and its
two seats, the auxiliary wheel and its supporting revoluble fork, the mechanism
for turning said fork, the auxiliary duplex cranks, and their connecting rods; all
being arranged and applied substantially and to operate as specified.
2. The combination of the detachable rod m, the frame E, the two seats A
and B, the main wheel C and its duplex cranks p, the auxiliary wheel D and its
supporting revoluble fork F, the mechanism for turning the said fork, the auxiliary
duplex cranks p¹, and their connecting rods t; all being arranged and applied
substantially and to operate as set forth.
3. The combination substantially as set forth for turning the fork F of the
auxiliary wheel, such combination consisting of the arms b, rods c, racks e, toothed
sectors, bevel gears g, h, shafts i, and their bent portions k, provided with
handles ; all being arranged and applied as represented.
4. The combination of the ratchet v, and its pawl w, with the auxiliary duplex
cranks, their connecting rods, the main duplex cranks, the frame with its seats,
revoluble fork, main wheel, auxiliary wheel and mechanism for turning the said
fork; all being substantially as set forth..
5. Each connecting rod t, as forked and provided with the latching shoe to
connect it with or disconnect it from the wrist of the inner crank, as described.
6. The combination with the frame E, and with the shafts i, i, of the steering
mechanism, of the head or frame u¹, adjustable on the said frame E, and applied
to such shafts, substantially and for the purpose as set forth.
7. Each bevelled pinion h, movable on its shaft i, and provided with a clamping
screw y, in combination with the tube z, and its clamping screw a², applied to the
shaft, and to the head or frame w¹, as set forth.
8. The frame E, provided with the abutment c², in combination with the
detachable handle bar m, provided with the post f³, adapted to such abutment,
substantially as set forth.

page_text: 9. The bracket u, clamped to the bar d of the frame E, and extended through
the box b, such box being provided with a clamp screw o¹-all being substantially.
as set forth. +-
T.
.