Improvements relating to Spring Fitting Finger Rings.
Year: 1893

page_text: Date of Application, 24th July, 1893-Accepted, 2nd Sept., 1893
COMPLETE SPECIFICATION.
Improvements relating to Spring Fitting Finger Rings.
I, ANDREAS DAUB of Pforzheim in the Empire of Germany Manufacturer of
Jewelery 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 the construction of rings so that they tend to contract
to fit to the finger of the wearer but may be expanded for removing or placing
them on the finger and it more particularly consists the methods of arranging the
spring to attain the action described.
In the annexed drawing Fig. 1 is an elevation Fig. 2 a side view of a ring with a
stone fitted therein. Figs. 3, 4 and 5 illustrate the construction of the part of the
ring under the said stone. Figs. 6 and 7 are detail views of connections near the
under part of the ring. Fig. 8 is a plan view of ring without stone and Fig. 9 a
detail view thereof.
Fig. 10 is a sectional view and Fig. 11 a side elevation of another modification of
the construction.
Fig. 12 is an elevation and Fig. 13 a side view of another modified construction.
Fig. 14 is a diagram showing the expansion of the ring.
The ring is based upon that type in which bars are pivoted to one another as
in the so-called "lazy tongs" and in Figs. 12 and 13 the ring is wholly so con-
structed. The spring resilience of the ring is arrived at by making one or more of
the pivoted pairs of larger width than the remainder and provided at their central
pivotal points cavities as shown in the drawings for receipt of a spiral or other spring
one end of which is fixed to one member the other to the other member. The pin d
may traverse this cavity in the wider bars a¹ and b' as shown in Figs. 8 and 9 or
the latter may be connected by what is usually referred to as a bayonet fastening,
the one member having a raised flange with laterally projecting lugs as in Fig. 4 to
fit within a depression in the other member the latter having an annular groove
into which the said lugs are turned and entrances to said grooves as shown in Fig 3.
This construction is suitable when a gem or stone of any kind is to be fitted in the
ring, and the spring may surround inner flange aforesaid.
In the rings shown in Figs. 1, 2, 10 and 11 only half of the ring is made of
pivoted cross bars while the remainder is composed of two hinged or connected
quadrants. It is then sometimes convenient to arrange the springs at the junctions
of the respective quadrants with the trellised bars making up the remainder of
the ring.
The action of the springs tends to keep the ring closed to its smallest diameter.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed I declare that what I
claim is ;-
1. A ring consisting wholly or partially of pivoted bars connected substantially
as described, in which certain pairs are of greater breadth than the remainder and
connected to each other and provided with springs substantially as set forth.
2. A ring consisting of two hinged quadrants and a semicircular trellis of pivoted

page_text: bars, the latter having at the centre or. sides of the trellis a spring or springs
arranged substantially as set forth.
Dated this 24th day of July 1893.
R. HADDAN,
Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, Agent for Applicant.