Improvements in and relating to Plaquets for Eyeglasses.
Year: 1893

page_text: Date of Application, 14th Aug., 1893
Complete Specification Left, 12th May, 1894-Accepted, 14th Nov., 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Plaquets for Eyeglasses.
We, WILLIAM BARR Junior Grocer and Wine Merchant, of St. Mary's Street,
and DAVID MCKAY, Goldsmith of Millburn Street, both in the Town and County
of Kirkcudbright, do hereby declare the nature of our invention to be as
follows:-
This invention has reference to and comprises a new method of constructing the
swivelling or oscillating forms of the plaquets or plaquet frames used in eyeglasses,
whereby they will be made in a more simple and complete manner, and have a
superior spring or elastic gripping action on the wearer's nose.
Heretofore these oscillating plaquets have been formed with a front face of
rubber, cork or the like, and a back segmental frame of sheet metal, with a separate
eyepiece brazed or soldered on at the centre for being mounted to loosely swivel or
oscillate on a fulcrum pin on the fixed eye frame.
Our improvements consist first in forming this segmental oscillating plaquet
frame or core, and its central eye in one combined piece of flat steel wire or
equivalent material by twisting it at the centre into a loop, coil, or eye, so that it
shall have within itself an elastic or spring action for the plaquet to bear on, and
grip the wearer's nose.
These plaquet frames would be formed under one arrangement by taking a length
of wire and twisting it into loops in opposite directions alternately at spaced
distances apart, and then cutting the wire between each pair of loops to form the
plaquet frames suitable for the right, and left sides respectively of the wearer's
nose. Rubber, cork or other suitable material may be secured to the face of these
improved plaquet frames by dovetailing the edges of these over to receive the
rubber, or by cement or other material.
By an improved arrangement however these new plaquet frames would be made
to form the internal cores of the plaquets. This would or may be accomplished
by taking the lengths of twisted or looped wire before being cut up, and laying a
series of them in parallel line in channels within a mould where they would be
embedded in or covered with sheets of dental rubber or other suitable elastic
material, and subjected to pressure. They are then placed in plaster of Paris
moulds under pressure, and after being vulcanized are cut up between the
uncovered loop parts, and so form complete segmental plaquets cither rigid or with
a spring like action as may be desired.
Dated 12th August 1893.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Plaquets for Eyeglasses.
We WILLIAM BARR, Junior, Grocer and Wine Merchant, of St. Mary's Street,
and DAVID MCKAY, Goldsmith, of Millburn Street, both in the Town and
County of Kirkcudbright do hereby declare the nature of our invention and in
what manner the same is to be performed to be particularly described and
ascertained in and by the following statement in writing, that is to say :-
This invention has reference to and comprises a new method of constructing t! e
[Price &d1

page_text: swivelling or oscillating forms of the plaquets or plaquet cores used in eyeglasses
whereby they will be made in a more simple and complete manner and have a
superior spring or elastic gripping action on the wearer's nose.
Heretofore these oscillating plaquets have been formed with a front face of
rubber, cork, or the like, and a back segmental frame of sheet metal, with a
separate eyepiece brazed or soldered on at the centre for being mounted to loosely
swivel or oscillate on a fulcrum pin on the fixed eye frame.
Our improvements consist first in forming this segmental oscillating plaquet
frame and its central eye in one combined piece of flat steel wire, or equivalent
material, by twisting it at the centre into a loop or eye so that it shall have within
itself an elastic or spring action for the plaquet to bear on and grip the wearer's
nose.
And in order that our said invention and the manner of performing or carrying
the same into effect or practice may be properly understood we have hereto
appended an explanatory sheet of drawings in which
Figures 1 and 2 represent views of eyeglasses as fitted with modified forms of
our improved eyed coiled or looped plaquet frames as forming cores for the
plaquets, that shown in Figure 1 being of convex or curved shape, and that shown
in Figure 2 of a straight shape.
Figure 3 represents detached views to an enlarged scale of one of these plaquet
core frames and
Figure 4 corresponding views showing our improved coiled plaquet frame in
which the rubber is secured or dovetailed into the face of same; while
Figures 5, 6, and 7 represent views showing the alternative processes by or in
which the spring loops, eyes, or coils may be formed on the plaquet frames.
Referring to these drawings
These plaquet frames a would be formed under one arrangement by taking a
length of wire and twisting it into loops or coils a¹ in opposite directions alternately
at spaced distances apart which may be accomplished by twisting the wire round
pins, a single pin for each coil or loop formed, as shown in Figure 5, and then
cutting the wire-centrally between each pair of loops a so as to form plaquet
frames suitable for right or left sides of wearer's nose.
Figure 7 shows how the loops or eyes a' may be formed by twisting the wire
round three pins c for each eye, so that the spring loop or eye a' in the metal
blank for each plaquet may assume the shape shown in Figure 6.
Rubber, cork or other suitable material may be secured to the face of these
improved plaquet frames a as shown in Figure 4 by dovetailing the edges of these
over to receive the rubber or by cement or other material.
By an improved arrangement however as shown in Figures 1 to 3 these new
plaquet frames a would be made to form the internal cores of the plaquets. This
would or may be accomplished by taking the lengths of twisted or looped wire
before being cut up and laying a series of them in parallel line in channels within a
mould where they would be embedded in or covered with sheets of dental rubber or
-other suitable elastic material and subjected to pressure in an analogous manner to
that described in our prior Patent No. 10,344", but the lids of these moulds are
formed with grooves or channels in line with and to receive the spring loops a¹.
They are then placed in plaster of Paris moulds under pressure and after being
vulcanized are cut up between the uncovered loop parts a¹ and so form complete
segmental plaquets b' either rigid or with a spring like action as may be desired.
In the arrangement shown in Figure 3, the wire is of round section and a recess
would be formed at a' in the wire a where the two parts meet at the loop a¹, and
this loop would project outside the rubber b.
In Figure 4 the wire is formed of dovetail or channel section to receive and
secure the rubber, but the overlapping or channel part is cut away at a so that the
wire shall assume a round or flat section where the loop a¹ is formed in a similar
manner to Figure 3.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is.
First. The forming of the segmental oscillating plaquet frames of eyeglasses
with a twisted or coiled central loop all in one metal piece so that said loop shall
form the swivel eye of the plaquet substantially as herein described in reference to
and by way of application shown in the accompanying drawings.
Second. The forming of segmental oscillating plaquet frames by taking a length
of wire and twisting it into loops in opposite directions alternately at spaced
distances apart and then cutting the wire' between each pair of loops to form the
all in one piece frames suitable for the right and left sides respectively of the
wearer's nose substantially as set forth.
Third. The forming of the segmental oscillating plaquets of eyeglasses with an
internal all in one piece spring looped core frame and an outer tubular covering of
dental rubber or the like substantially as set forth.
Dated 11th Ma 1901
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.