improvements in и песть
Year: 1897

page_text: Date of Application, 2nd Nov., 1897-Accepted, 12th Mar., 1898
improvements in и песть гот
I, GEORGE WILLIAM MARBLE, of Plymouth, in the County of Marshal, State of
Indiana, United States of America, Manufacturer, 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 wood rim pneumatic tire suspension spoke bicycle
wheels. The object of my invention is to perfect such wheels and to increase their
durability, strength and efficiency, especially in respect to the construction of the
wood rim.
My invention consists in a wood rim for a bicycle wheel, formed of a single
solid piece of wood bent to circular form, and having its meeting ends united to-
gether by an interfitting tongue glued joint, and provided with annular grooves,
one on each side, in which are fitted and securely glued supplemental strips or
rings of wood which serve to cause the crescent-shaped solid piece annular rim to
always maintain itself in a true plane and of true circular shape, and to prevent
warping of the rim. It further consists in wire or metallic rings inserted in
the annular grooves of the solid piece wood rim which give additional strength to the
rim and tend to prevent the slackening of the tension of the suspension spokes by
shrinkage of the wood rim. It further consists in providing the solid piece wood
rim at the interfitting tongue joint with a wood splice piece extending across and
lengthwise of the tongue joint, and which fits in a dovetail tangential groove
provided for it in the wood rim.
By this means I secure a wood rim for suspension spoke pneumatic tire bicycle
wheels of great strength and very light in weight, and which is well adapted to
properly resist all the various different kinds of strains to which such wheels
are subjected in use. The square abutment of the tongues of the joint against the
shoulders between the tongues, in connection with the solid piece construction of
the rim gives great strength thereto as a continuous circular arch to resist the
great compression strains due to the tension of the suspension spokes and the
compression exerted by the pneumatic tire; and the extended glue surface produced
by the numerous interglued side faces of the interfitting tongue in connection
with the dovetail splice piece and the supplemental wood strips or rings and wire or
metal rings fitted in the annular grooves of the solid piece wood rim give great
strength to the rim in resisting flexure or displacement strains at the joint or else-
where, and also in resisting the tensile or separating strains exerted upon the rim
through the driving mechanism of the bicycle; while at the same time the rim is
prevented from warping or getting out of true plane or circular shape, and also from
shrinking so as to loosen the tension of the suspension spokes.
In the accompanying drawing, which forms a part of this specification, Fig. 1
is a side elevation of a pneumatic tire suspension spoke bicycle wheel embodying
my invention; Fig. 2 is an enlarged detail central longitudinal section at the
interfitting tongue joint of the wood rim; Fig. 3 is a detail plan view looking at
the outer concave face of the rim at the joint portion thereof; Fig. 4 is a similar

page_text: plan view looking at the inner convex face of the rim; Figs. 5 and 6 are cross
sections on line 5-5 and 6-6 of Fig. 2.
In the drawing A represents the hub of the wheel, B its tension spokes, Cits
pneumatic tire, the wood rim F the supplemental strips or rings of wood, G the
wire or metal rings and H the supplemental wood splice piece at the joint uniting
the meeting ends of the wood rim D.
The wood rim D is formed of a single solid piece or strip of wood bent to
circular form and of the required crescent or concavo-convex form in cross section
to receive the pneumatic tire C. The two meeting ends of the solid piece wood rim D
are secured together by an interfitting tongue joint D', composed of a series of inter-
fitting tongues dd formed on the two meeting ends of the rim, the square ends of the
tongues abutting against the square shoulders between the tongues, and the meet-
ing faces of the tongues are securely glued together. After the strip of wood forming
the rim Dis bent to circular form and its meeting ends thus united together by the
interfitting tongue joint, and before the rim is turned to its finished form in cross
section, I provide it with a number of annular grooves ³, preferably two, and one
located on each side of the rim, and also with a dovetail tangential groove 12
extending longitudinally of the joint D' on the outer periphery of the rim. I
then place in the annular groove ³ the wire or metal rings G and also securely
fit and glue in place the supplemental wood strips or rings F in said annular
grooves 3; and also fit and glue in place the supplemental dovetail splice piece H
in the tangential groove D2. After this has been done the rim is then turned to
its required concavo-convex or crescent form in cross section.
The ends of the annular wood strips or rings F may be simply abutted to-
gether, and the ends of the wire or metal rings GG may also be simply abutted,
although I prefer that the ends of the wire or metal rings should be brazed or
welded together.
The tangential channel or groove D2 in the solid piece wood rim D is preferably
provided with double dovetail depressions 13 D at its sides, and the wood splice
piece with double dovetail projections h h in order to better distribute the strain
and diminish the liability of pressure upon the horns of the crescent-shaped rim D)
to split or spring it.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
1st. In a bicycle wheel, the combination with the pneumatic tire and suspension
spokes, of a solid piece wood rim, crescent-shaped or channeled in cross section to
receive the pneumatic tire, having its meeting ends secured together by an inter-
fitting tongue glued joint, and provided with annular grooves extending around the
rim, wire or metal rings fitting in said annular grooves and supplemental annular
strips or rings of wood fitted and glued in said annular grooves, said solid piece wood
rim being further provided with a tangential dovetail groove extending lengthwise
of said interfitting tongue joint, and a dovetail wood splice piece fitted and glued
in said tangential groove, substantially as specified.
3
4
2nd. The solid piece wood rim provided with annular grooves and supplemental 4
annular strips or rings of wood fitted. and glued therein, substantially as specified.
3rd. The solid piece wood rim provided with annular grooves and supplemental
annular strips or rings of wood fitted and glued therein, and wire or metal rings
also fitting in said annular grooves in the wood rim, substantially as specified.
4th. The solid piece wood rim having its meeting ends secured together by an 5
interfitting tongue glued joint and provided with a tangential groove extending
longitudinally of the joint, and a wood splice piece fitted and glued therein,
substantially as specified.
5th. The solid piece wood rim having an interfitting tongue joint uniting its
meeting ends, and a dovetail splice piece extending longitudinally of the joint, 5
substantially as specified.

page_text: 6th. The combination with a pneumatic tire and suspension spokes, of a wood
rim having at its joint or meeting ends a series of interfitting tongues glued together,
said rim being provided with annular grooves and supplemental wood strips or
rings F secured and glued therein, substantially as specified.
day of September 19.
GEORGE W. MARBLE.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.