Improvements in Dental Instruments for Swaging Gold Plate for Crown or Bridge Work.
Year: 1898

page_text: PROVISIONAL DIECIFICATION.
Improvements in Dental Instruments for Swaging Gold Plate for
Crown or Bridge Work.
I, WILLIAM HARAI BAIRD, of Burlington, Iowa, U.S.A., Inventor, do hereby
declare the nature of this invention to be as follows::
The object of this invention is to provide improvements in dental instruments
for swaging gold plate for crown or bridge work, and to provide an article of the
kind in which, by reason of the improved construction, the work can be more
efficiently performed than is at present possible.
The invention comprises a substantially anvil-shaped block of metal (herein-
after called the lower block) having a dove-tail groove in its upper face to retain
a die which can be adjusted therein. Another block of metal (hereinafter called
the upper block) having its upper part shaped similar to the head of a hammer,
has a soft metal block secured to its underside and adapted to be brought into
contact with the gold plate placed between it and the die.
The upper and lower blocks are adapted to reciprocate towards and from each
other by means of levers pivoted at the sides of the blocks and to each other in
such manner that the two blocks come together with their faces truly parallel.
Hand-levers pivoted to the blocks, and to each other, provide convenient
means for reciprocating the blocks and holding them whilst the gold plate is
being swaged.
In an alternative form the back of each block is formed with a dovetail groove
in which a plate is fitted to slide. The plate has a vertical slot through which
lugs, which project from the blocks, pass. Hand-levers are pivoted to the lugs
by pins which work in elongated apertures in the lugs.
In other alternative forms, the hand-levers are pivoted to the jaws in such
manner as to cause them to reciprocate with their faces parallel; or the levers
may be pivoted to lugs or projections for the same purpose.
Dated this 9th day of August 1898.
R. RAINSFORD,
Agent for Applicant.
() Improvements in Dental Instruments for Swaging Gold Plate for
Crown or Bridge Work.
I, WILLIAM HARAH BAIRD, of Burlington, Iowa, U.S.A., Inventor, do hereby
declare the nature of this invention and in what manner the same is to be
Price Sd]

page_text: performed, to be particularly described and ascertained in and by the following
statement
This invention relates to certain new and useful improvements in instruments
for swaging gold-plate for making crown and bridge work for dental purposes;
the object of the invention being to generally improve the construction of said
instruments and thus render them stronger and more efficient in use in every
way.
Reference being had to the drawings hereunto annexed, Figure 1 is a side
elevation of an improved construction of my invention, and Fig. 2 is a plan
thereof.
Fig. 3 is a side elevation of an alternative construction.
Fig. 4 shews a section taken on the line of Figs. 1 and 3.
Figs. 5 and 6 are detail views of some of the parts.
My improved instrument comprises upper and lower blocks 1, 2, of hard metal.
The lower part of the block 2 may be formed in the shape of an anvil, as shewn
at 3, whilst its upper face is provided with a dovetailed recess 4 to fit and retain
the die-seat 5 having a central opening 6 to receive the male die 7. If pre-
ferred, however, the die 7 may be made integral with the seat 5.
The upper part of the block 1 is preferably formed in the shape of a hammer
head.
Bifurcated lugs 8, 9 project rearwardly from the respective blocks.
Pliers
fit between the lugs, as clearly shewn in Fig. 2, and have their shorter and
longer arms 10, 11 pivoted in elongated apertures 12, by pins 14.
It will be understood that manipulation of the pliers will cause the blocks to
approach or recede from each other with a parallel movement.
In Fig. 3 the blocks are shewn as connected by a plate 15. The lower end
of said plate is formed with a toe 16 to fit the recess 17, and it is further secured
in place by the bifurcated lug 18 having the screw-threaded shank 19, which
enters the block 2, as shewn, after being passed through the aperture 20 in the
plate 15.
A lug 21 is passed through a slot 22 in the plate, and the block 1 is
adjusted onto the screw-shank 23; there being sufficient play between the rear
face of the block and the projections 13 on and at right angles to the lug 21 to
permit of easy reciprocation of the block, and lug, in the slot 22. The recipro-
cation is effected by the pliers; the upper shorter arm 25 of which is pivoted
in the elongated aperture 26 of the lug 21 whilst the lower shorter arm 25 is
pivoted in the lug 18. The plate 15 is preferably bowed, as shewn at 27, so as
not to obstruct the space between the blocks 1 and 2.
In using the apparatus the die is inserted in the lower jaw of the apparatus.
The gold plate is placed upon the die. A bar of soft lead 28 (shewn in dotted
lines, Fig. 1) is then placed over the gold plate and against the under face of the
upper jaw. When in this position, the jaws are closed to prevent the slipping or
moving of the two plates. The block 2 is then placed upon a solid base, and
the upper jaw is struck with a hammer or other suitable implement until the
gold plate is swaged to conform to the contour of the die, the soft metal or lead
being also indented and yielding to the pressure. By this means the gold is
swaged in the plate, leaving the clear imprint of the die on both its outer and
inner face. The plate is then taken out and worked into a crown bridge, or
abutment for a bridge.
It is obvious that the die can be mounted in the slide in a manner other than
shewn, and it is to be understood that in that respect the invention is not limited
to the form shewn and described.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
(1) An instrument for swaging gold-plate for dental purposes having upper

page_text: and lower reciprocable blocks, bifurcated lugs projecting rearwardly from each
block, pliers fitted in the bifurcation of said lugs, and having their longer and
shorter arms pivoted in elongated slots in the respective lugs, substantially as
and for the purposes herein before set forth and illustrated in the drawings
hereunto annexed.
(2) An instrument for swaging gold-plate for dental purposes, having upper
and lower reciprocable blocks, bifurcated lugs projecting rearwardly from each
block, pliers fitted in the bifurcation of said lugs, and having their longer and
shorter arms pivoted in elongated slots in the respective lugs; a die removably
held upon the upper surface of the lower block, and a flat soft metal block.
arranged between the jaws and adapted to coact with said dies, substantially as
and for the purposes herein before set forth and illustrated in the drawings
hereunto annexed.
(3) In an instrument for swaging gold plate for dental purposes comprising
upper and lower reciprocable blocks and a die or dies removably held upon and
operating in conjunction with said blocks, a metal plate secured to one block
and reciprocably fitted to the other block, lugs projecting from said blocks
through and rearwardly of said plate, and pliers pivoted to said lugs whereby
reciprocal movement may be imparted to said blocks, substantially as and for
the purposes hereinbefore set forth, and illustrated in the drawings hereunto
annexed.
1000
R. RAINSFORD,
Agent for Applicant.