Year: 1897

page_text: I, MIKAEL PEDERSEN, of Kingsley House, Dursley, in the County of Gloucester,
Engineer, do hereby doclave the nature of this invention to be as follows:-
My invention relates to bicycles of the kind dosigned to be riddon by two or
more persons, the object of my invention being to adapt a frame of the kind
described in the Specification of my forner Lotters Patent No. 18371 of 1898 to
such bicycles.
In constructing a frame for a tandem bicycle I make the front part of the frame
substantially in the manner described in the specification of my suid formor Patent
except that at the point upon this frame where the back wheel axle is carried I place a
bottom bracket for the rear crank axle the said bottom bracket being hereinafter
referred to as the rear bottom brackot, and that instead of the wires that extend from
the seat downwards to the same point I substitute tubes.
Rearwards from this rear bottom bracket inbes extond in a substantially
horizontal position at the outer ends of which tubos is carried the axle for the back
wheel tie rods or tubes extending from the rear end of these rods to a point at
which two other pairs of tubes of the front portion of the frame are united so that
three sets of tubes converge to one point.
In practice I prefer to unite these tubos to a threo armed plato oue arin being for
cach pair of tubes the said plate serving for the attachment of the rear end of the
Beat support for the front rider, for the frout end of the said support of the rear
rider and for carrying the handle bar for the rear rider. The tube forming this
handle bar is inserted through an aperture in the said three armed plate and is
fixed and stayed therein by means of angle pieces arranged at the angles of the
plate and the bar so as to make the said bar rigid relatively with the said plato.
The rear end of the seat support for the back rider is attached to the angle of a
triangular support formed of two pairs of bars one pair of which extends from the
rear bottom bracket and the other from the rear end of the frame, or instead of
using bars at the latter point wires may be used.
If the machine is for three or more riders a second or more extensions similar to
the extension first described is formod upon the first extension.
In order to impart increased strength to the front wheel fork and the head of
the machine as compared with the fork and head for a single bicycle I advan-
tageously provide the said head with wire trusses the wire being connected to the
top of the head and the bottom of the fork at each side and bearing against bridge
pieces at the sides of the fork and more or less at the centre of the same.
Dated the 2nd day of December 1897.

page_text: Improvements in Bloycles.
I, MIKAEL PEDERSEN, formerly of Kingsley House, now of Raglan House, Dursley,
in the County of Gloucester, Engineer, 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:-
My invention relates to tandem, triplet, quadruplet and other bicycles intended
for two or more riders, the object of my invention being to construct a frame which
is light and strong.
A frame constructed according to my invention may be regarded as being com-
posed of a series of triangles which are arranged in the novel mannor hereinafter
described so as to mutually support and strongthen one another.
In the accompanying drawings,
Figure 1 is a side elevation of a tandem bicycle provided with my improved
frame; and,
Figuro 2 is a perspective view of the frame;
Figure 3 is a side elevation of a triplet bicycle; aud,
Figuro 4 is a diagram illustrating the principle of construction of my framo;
Figures 5 and 6 are respectively an elevation and a sectional plan drawn to a
larger scale illustrating a detail of the construction.
Referring first to Figure 4 a b c, d b c, d c e, f c e, f eg, heg, hyi uud k g i
indicate a series of triangles such as are used in the construction of a bicycle frame.
The bars forming tho bases of the several triangles are muited to suitable sockets-
for carrying the crank axlo bearings, the said base bars and sockets when united
practically forming a continuous bar. The sections of this bar between the pairs
of bearings each form the common base of two triangles, that is to say, the section c
has upon it the triangles a b C,
db
C, the section c e tho triangles dcc, fce, the
section eg the triangles feg, h eg and the section gi the triangle hgi and ky i.
It will be noticed that all the triangles with the oxcoption of the front triangle ab c
and rear triangle kg i are arranged so that two triangles on adjacent sections have
a common bar, that is to say, the trinugles db c, d ce on the sections bc, ce have
the common bar d c, tho triangles fce, feg on the sections ce, eg have the common
bare and the triangles he g, hgi on the sections eg, gi have the common bar hy.
All the bars are composed of double tubes united to suitable sockets and also
united at any points where the tubes cross or intersect one another.
The front wheel fork j is at its upper end pivoted or jointed in a socket at the
apex a of the front triangle and at a point between its two ends to a pair of bars
projecting from the front socket at the angle 6 of the front triangle. The axle for
the rear wheel is carried at the angle e of the rear triangle dc e.
The seat for tho frout rider is suspended between the apices a and d and for the
rear rider between the apex d and the apex k formed by the extremity of a pair of
bars or a back stay m which project or projects from sockets of the angle e, the said
bars being connected by a tension brace n to the extremity of the rear bar section.
In the case of the triplet bicycle, shewn in Figure 3, the frame is composed of
six triangles, the front wheel fork and the rear seat back stay being attached in the
manner hereiubefore described.
It will be understood that in the case of a quadruplet the frame will be
composed of eight triangles, in the case of a quintet bicycle of ten triangles and
80 on.
It may be advantageous in some cases to strengthen the front fork against the
lateral displacement which might be produced when several riders are running at a
high speed; in this case I advantageously trues the front fork in a manner which

page_text: will be clearly understood by reference to Figures 5 and 6. In these figures
o, o, o, o, are the four tubes of which the front fork is usually composed and p is
the plate which braces the said tubes together and to which the pair of bars lis
pivotted at q. In order to strengthen the fork I provide the plate p with the
projecting pieces, r, through which the trues wires or rods or tubes 8, 8 secured
to the upper and lower enda of the fork, are passed in a manner that will be readily
anderstood by reference to the drawings.
When additional strongth is required I sometimes arrange tie bars t, t (indicated
by dotted lines in Figure 3) between the apex of the front triangle and the back
wheel axle and between the rear end of the back seat stay and front crank axle
socket.
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:-
1. A bicycle frame built up of a series of triangles the bases of which are on a
continuous bar carrying the crank axlo bearings the sections of the said continuous
bar between the bearings each forming the common base of two triangles, each
triangle with the exception of the front triangle on the front section and the back
triangle on the back section having one of its sides common to two triangles on
adjacent sections, the bars forming the several sides of the triangles being
composed of double tubes united to suitable sockets and having their apices formed
for the attachment of suspended seats or saddles, the apex of tho frout triangle
being jointed to the front wheel fork and tho rear end of the base of the rear
triangle being adapted to carry tho back wheel axle; the apox of the rear triangle
forming a suspension point for the back saddle, substantially as described.
2. In a bicycle the combination with a frame built up of a series of triangles
mutually connected together as described, of a front whool fork pivoted to the said
frame at its upper end and to a stay (1) projecting from the lower front end of the
Baid frame and of a back stay (m) and a tension brace (n), substantially as
described.
3. In a bicycle the combination with a frame built up of a series of triangles
mutually connected together as described, of a front wheel fork pivoted to the said
frame at its upper end and to a stay (1) projecting from the lower front end of the
said frame the said fork having the lateral truss wires or rods (8, 8), substantially
as described.
4. The manufacture and use of bicycles having frames constructed substantially
in the manner hereiubefore described and illustrated in the accompanying
drawings.
G. F. REDFERN & Co.,
4, Sonth Street, Finsbury, London, Agents for the Applicant.