A New or Improved Device for Gauging Fingers, Rings, Tubes, and the like.
Year: 1898

page_text: Date of Application, 25th Jan., 1898-Accepted, 2nd Apr.,
1898
CUMI LEIE DIMULTIVATION
A New or Improved Device for Gauging Fingers, Rings, Tubes,
and the like.
A communication from LOUIS DELATRE, of Paris, in the Republic of France.
I, ARTHUR FREEMORE SPOONER, of 323, High Holborn, in the County of London,
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 :-
This invention relates to measuring apparatus and is designed to provide an
improved combination external and internal caliper gauge or device adapted more
especially for the measurement of the external diameter or circumference of fingers,
and the internal diameter or circumference of rings, by the use of which the
complicated and inaccurate measuring devices at present employed by jewellers and
others for the above purposes can be dispensed with.
In the accompanying drawing I have shown how my said invention may be
conveniently and advantageously carried into practice :
Figure 1 is a perspective view showing my apparatus as employed for the measure-
ment of a finger, and
Figure 2 is a similar view of the other side thereof showing it as employed for the
measurement of a ring.
Figure 3 is a front view, the cover being partly removed, so as to show the internal
mechanism.
Like letters indicate corresponding parts throughout the drawing.
This apparatus comprises a metallic or other case or box B upon which a cover A
is secured by screws or the like, and which case or box, provided with an opening
at its lower or other part, contains the mechanism hereinafter described.
This mechanism consists of a toothed pinion or worm wheel P the axle of which
passes through the case or box and has mounted upon one of its extremities an index
A toothed
hand or pointer t and upon the other a second index hand or pointer 8.
ring C is located within the lower part of the case or box B. To this ring is secured
as indicated at n, one end of a curved or hooped spring R the other end of which
spring is fixed at p to the case or box B. An endless screw or worm V gears or
meshes with the pinion or worm wheel P and the toothed ring C and is capable of
rotation from the exterior by means of one or other of the knobs or thumb
pieces M, M¹. Two graduated dials D and F the one engraved upon or secured to
the case or box B¹, and the other in like manner engraved upon or secured to the
cover A, so that the index hands or pointers 8 and t may turn to and indicate upon
any particular divisions upon the said dials as hereinafter described.
The operation of the apparatus is as follows:
When, for example, it is desired to take the measurement of a finger, the latter
should be introduced, as shown in dotted lines in Figure 1 into the curved or hooped
spring R which projects to a certain extent from the case or box at each side. By
rotating the endless screw or worm V by means of either the knob M or M¹, the said
spring can then be moved until it has been brought into perfect contact with the

page_text: whole of the circumference of the finger.
The said movement of the spring being
effected by the toothed ring C which rotates in the box or case B and carries with it,
by the attachment n, one end of the said spring, whilst at the same time the endless
screw or worm V, which operates the said toothed ring, rotates the toothed pinion
or worm wheel P' and the pointer 8 to indicate on the dial D the measurement of the
finger. This dial has engraved upon it the word "finger." If on the other hand
it is desired to measure the internal circumference of a ring the said ring must be
placed upon the spring R as indicated in dotted lines in Figure 2, and the endless
screw or worm V turned in the opposite direction until the said spring is brought
into contact with the interior surface of the ring. The measurement of the latter
can then be read upon the dial F, marked with the word "ring," by means of the
pointer t which has been displaced in like manner by the toothed pinion or worm
wheel P.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. A device, gauge or caliper for measuring more especially the external circum-
ference or diameter of fingers and the internal circumference or diameter of rings,
comprising a box or case having an opening in which is mounted a curved or hooped
spring extending beyond the said box, one end of which spring is fixed to the said
box whilst the other end is secured to a toothed ring capable of being operated from
the exterior by an endless screw or worm which latter actuates at the same time
a toothed pinion or worm wheel the axle of which carries two pointers serving to
indicate upon external graduated dials, either the measurement of a finger
introduced into the curved or hooped spring, or that of a ring placed upon the
projecting portion of the said spring, substantially as described.
2. The improved measuring apparatus constructed substantially as described with
reference to the accompanying drawings.