Improvements in and relating to Steel Spring Rims for Cycle Wheels.
Year: 1898

page_text: Date of Application, 31st May, 1898-Accepted, 19th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in and relating to Steel Spring Rims for Cycle Wheels.
I, JOHN MARTIN, of 21, Cargate Avenue, Aldershot, Hampshire, Brigade
Surgeon, Lieutenant Colonel in the Army Medical Staff, 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:-
The nature of this invention is the attachment by screws, bolts, or slots, to a
wheel rim, of a series of steel spring bands, whereby sufficient resilience is
obtained to obviate the jar or jolting occasioned by a wheel passing over an un-
even surface, without any continuous band or tyre encircling the springs, for
application to cycle wheels.
The principle of this invention is applicable by (a) the attachment of both
extremities of the steel spring on one point on the rim, forming a ring spring:
by (b) the attachment of each extremity of the steel spring at different points
on the rim, forming an arch spring; by (c) the attachment of one extremity of
the steel spring to the rim, the other extremity being attached to, and sup
ported by one or more of the adjoining springs forming a Cee spring, and
lastly () by the attachment of one extremity of the steel spring to the rim, the
other extremity being free forming a lever spring.
The accompanying drawings Sheets 1 and 2 illustrate the arrangement for
the arch spring, Sheet 1 showing part of the rim (1) and one spring separately(2):
Sheet 2 showing springs as they would be in position attached to the rim; the
drawing being intended to represent springs of 8 inches in length, each of them
arching over 6 inches of rim circumference-the amount of resilience obtained
increasing in proportion to the length of the spring; that is, to the height and
span of the arch. If both extremities of each spring were fixed by one screw
at one and the same point on the rim, or if a circular spring were so attached
the ring spring would be formed. The drawings Sheets 3, 4, and 5 illustrate
the arrangement for the Cee spring application of this principle. Sheet 3 shows
one unattached spring, in this drawing A1 indicates the curved portion of the
spring, A 2 the concealed portion when the springs are fixed in position on the rim,
A3 the exposed portion, (that is the part coming in contact with the ground
when the wheel rotates) and At the spur which keeps this extremity of the wheel
in position. Sheet 4 shows a part of a rim with the springs in position on it,
and in this drawing the parts A 1, A3 and A4 likewise, B1, B3 and 14 are
shown corresponding with the parts so indicated in drawing Sheet 5.
Sheet 5 is a diagram illustrating the juxtaposition of several adjoining springs.
If there were no spur-this extremity of the spring being quite free and un-
supported the lever spring form of this principal would be obtained, but in this
case the spring material employed should be of more resistant force. Drawing
Sheet 6 shows the four forms of application of the spring (1) (2) (3) (4).
The portion of each spring which comes in contact with the ground, that is
the central 3 inches of each arch spring, and the exposed portion (indicated in the
drawings Sheets 4 & 5 as A3 & B 3) of each Cee spring may be enclosed in pieces of