Year: 1892

page_text: Date of Application, 22nd July, 1892
Complete Specification Left, 20th Apr., 1893-Accepted, 20th May, 1893
A communication from HERMANN KAUEMANN, of Langerwehe, in the Empire of
Germany.
1, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Member of the Institution of Mechanical Engineers do hereby declare the nature
of this invention to be as follows:-
The main or motor-springs hitherto used have been made in the shape of
elastic metal strips or bands spirally wound in one plane throughout. It has,
however, been found in practice that whenever a mechanism to be driven was
arranged to complete a considerable number of revolutions under the action of the
same spring, other more or less complicated means of transmission of motion had
to be resorted to, as a spiral spring as at present constructed having a sufficient
number of convolutions for moving such mechanism, would be of too large a
diameter and would occupy too much space.
In the improved construction of spiral spring the number of convolutions of the
spring may vary without altering its diameter, an increase in the number of
convolutions only adding to its height.
One end of the spring is secured to the spindle and the other to the part to be
driven, so that when the spring is wound up or compressed, the ensuing diminution
of diameter causes a corresponding increase in the number of convolutions, the
consequence being that, as the length of the spring remains the same the adjacent
convolutions telescope with each other.
This spring when wound up, is adapted to operate mechanism not only
by imparting rotary motion, but also by exercising its action longitudinally if
required.
The inner edge of the coiled spring-metal band forms a screw thread or worm
of smaller diameter than the outer edge, and the convolutions, thus becoming funnel-
shaped, telescope with each other. When the spring is unwound the difference in
diameter between the outer and inner edges of the convolutions decreases, and
accordingly the angle of inclination of the walls of the telescoping funnels acquires
more amplitude.
The winding of the spring on its spindle is facilitated by the provision of a come
at one end of the spindle, to give the spring its initial shape.
It will be understood that all the details requisite for carrying out this
invention cannot be set forth in this Provisional Specification, these are reserved
for their proper place in the Complete Specification. Modifications in the parts
described may be made without departing from the spirit of this invention.
Dated this 22nd day of July 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
An Improved Motor-spring.
A communication from HERMANN KAUFMANN, of Langerwehe, in the Empire of
Germany.
I ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent 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 main or motor-springs hitherto used have been made in the shape of elastic
metal strips or bands spirally wound in one plane throughout. It has, however,
been found in practice that whenever a mechanism to be driven was arranged to
complete a considerable number of revolutions under the action of the same spring,
other more or less complicated means of transmission of motion had to be resorted
to, as a spiral spring as at present constructed having a sufficient number of con-
volutions for moving such mechanism, would be of too large a diameter and would
occupy too much space.
In the improved construction of spiral spring as illustrated in the accompanying
drawings the number of convolutions of the spring may vary without altering its
diameter, an increase in the number of convolutions only adding to its height.
In the drawings
Fig. 1 is an elevation showing the spring expanded, and Fig. 2 an elevation
showing it compressed or wound up.
Figs. 3 and 4 are plans respectively corresponding to Fig. 1 and Fig. 2.
Fig. 5 illustrates the process of winding up the spring.
One end of the spring is secured to the spindle and the other to the part to be
driven, so that when the spring is wound up or compressed, the ensuing diminution
of diameter causes a corresponding increase in the number of convolutions, the
consequence being that, as the length of the spring remains the same, the adjacent
convolutions telescope within each other.
This spring, when wound up, is adapted to operate mechanism not only
by imparting rotary motion, but also by exercising its action longitudinally if
required.
The inner edge of the coiled spring-metal band forms a screw-thread or worm
of smaller diameter than the outer edge, and the convolutions, thus becoming
funnel-shaped, telescope within each other. When the spring is wound up the
difference in diameter between the outer and inner edges of the convolutions
decreases and accordingly the angle of inclination of the walls of the telescoping
funnels to the axis become smaller.
Having now particularly described and ascertained the nature of the said
invention as communicated to me by my foreign correspondent and in what manner
the same is to be performed I declare that what I claim is :-
1. A motor-spring in which funnel shaped convolutions are arranged along the
spindle or axis one behind the other and telescoping within each other.
2. A motor spring having funnel-shaped convolutions such as described.
Dated th th ...
J
'one
W. P. THOMPSON & BOULT,
Agents for the Applicant.