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Патент USA US3058165

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Oct. 16, 1962
Filed Deo. l, 1959
United _ States Patent C)> ice
Pârentçd oct. 16, 1962~
In the drawings:
FIGURE l is a front elevational view, partly in sec
tion, showing a three member hinged dental flask, em
ploying a press for clamping the flask; and
FIGURE 2 is Áa sectional View taken along line 2-2
Samuel Harris, 94-15 69th Ave., Forest Hills, N.Y.
Filed Dec. 1, 1959, Ser. No. 856,405
1 Claim. (Cl. 18-33)
of FIGURE l.
This invention relates to dental flasks wherein arti
Referring to the drawings, a base flask member 10
is shown having a central cavity 11 of generally rec
ficial dentures are formed and more particularly to a
three member hinged molding flask that is especially
adapted for processing acrylic teeth to extensive metal
bridgework or for processing acrylic teeth to a plate
The present invention is an improvement to the dental
flask disclosed in my earlier patent, No. 2,896,259. In
the flask therein disclosed, there is provided a shell-like
tangular form and a size to accommodate a removable
platform piece 12. The platform piece comprises a base
portion 13 that fits substatnially into cavity 11, and an
upper convex portion 14. The upper convex portion
is shown extending between the sidewall members 15 as
it would be in the event that a dental bridge was being
molded. However, if a full dental plate was being made
base member Ithat accommodates a convex platform piece
the convex portion 14 would take the form of two
over which investment material is molded. A metal
spaced apart upright members. A cover piece 20 is also
bridge having wax teeth formed thereon in the places
provided to fit over the platform 12. While platform 12
where acrylic teeth are ultimately to be provided is arched
itself may be used effectively, the provision of cover
over, and ern-bedded, in the convex surface of the in 20 piece 20 has been found useful to insure the produc
vestment material. An upper flask member hinged to
tion of good fitting dental bridges. This for the reason
one end of the base member is filled with investment
that the dental bridge is a very delicate structural element
material whereupon it is pivoted into engagement with
that can too easily be deformed in removing it from the
one-half of the bridgework embedded in the investment
investment material in which it is embedded. It is ob
material formed on the platform. A second upper flask 25 vious Ithat even the slightest spring of the bridgework
member hinged to the other end of the base member
will result in a misfit when placing such bridge in the
is similarly filled with investment material and pivoted
mouth of a patent. With the provision of the cover piece
into engagement with the other half of the embedded
20 the routine work of forming a dental bridge can be
bridgework. A clamping device is then utilized to bring
performed by the less skillful workers in a dental labora
the three members of the flask into intimate and tight 30 tory. Thereafter, the finished bridge can be removed
contact with each other. After the investment material
from the flask by removing the platform and sliding
has hardened and the flask opened, an impression of
cover piece 20 from the platform. The flask can then
the wax teeth is formed in the investment material of
immediately be put to further use by utilizing an addi
the upper flask members. The wax can then be melted
tional cover piece 20 while the bridgework formed can
from the bridgework and a mold is thus provided into 35 be removed from the original cover piece at the con
which the acrylic material is placed. By reclosing and
venience of the most skillful technician in the laboratory.
tightening the -flask with the clamping device, the acrylic
An aperture 19 formed in the bottom of base member
material in the form of teeth conforming to the pattern
1t) is provided so that platform piece 12 containing
of the mold, is adhered to the metal bridgework.
hardened investment material and the finished bridge may
The flask of the earlier patent has many advantages, 40 be readily removed from member 10 after the bridge
one of which is that the acrylic material may be readily
making >operation is completed as by tapping the bottom
viewed lby the dental technician as he reopens and re
of piece 12 through the aperture with an appropriate
closes the flask, and hence the coloring and shading of
the dentures can be altered during the process of form
The side wall members 15 are formed integral with
ing the teeth. Another advantage of the flask is that a 45 base member §10. 'Of course, such members may be
locking member is provided which insures that a finished
removably fastened to base member 10 as by inter
dental bridge will faithfully conform to the shape and
locking pins provided on the side walls and projecting
size of the wax yteeth used in making the mold for the
into approximately placed holes in the base member as
acrylic teeth.
in my earlier patent. With the platform piece in place,
It has been found that further improvements can be 50 the upper convex member 14 abuts the side walls 1S.
made to the three member hinged dental flask of my
Locking segments 17 are formed integrally on the side
earlier invention, particularly with regard to the clamping
walls and they perform the same function as member
device used to press the three flask members into close
17 with prongs 22 of my earlier patent. It has been
contact with each other. It is extremely imporatnt
found that the integral construction of the flask as herein
that the three members be tightly engaged so that the 55 described has greatly simplified the flask so as to render
acrylic material placed in the mold fill all the voids
it more easily useable by dental technicians.
thereof yand in addition be as dense as possible. This
One end of base member 10 is formed with a pair
requires that the clamping device be capable of exerting
great pressures in forcing the flask members into ínti
mate engagement.
In carrying out the present invention there is pro
vided a pair of presses each of which applies a force
to direct an upper flask member into engagement with
of projecting arms 23 which serve to support a pin
24. A hook-like appurtenance 25 formed on upper flask
member 26 engages the pin in the fashion of a hinge
so that the flask member 26 can be pivo‘ted thereabout.
Member 26 is also formed with walls 27 which when
the member is in closed position conform to the contour
the base member of the flask. Each press is capable of
being self-supporting in an upright position so as to» facili 65 of the side walls 15. A U-shaped lug 30 formed atop
member 26 may be utilized to lock the flask as will here
tate its use by the dental technician. Moreover, the
inafter be described. An aperture 29 is provided in the
press is such that it applies a force in a direction most
upper flask member to facilitate the removal of hardened
efficient in bringing the flask members into tight contact
investment material therefrom after the flask has been
with each other.
Features and advantages of this invention will be 70 used.
The other end of base member 10 is similarly pro
gained from the foregoing and the description of a pre
vided with a pair of projecting arms 3'1 which serve to
ferred embodiment thereof which follows.
support pin 32.
A hook-like appurtenance 33 formed
on the second upper flask member 34 engages pin 32
so that flask member 34 can be pivoted thereabout to a
closed position.
When in such position, the walls 35
of member 34 conform to the contour of side walls
15. As in the case of member 26, member 34 also is
formed with a U-shaped lug 36. An aperture 37 is
provided in flask member 34 to facilitate the removal
of hardened investment material therefrom after the flask
has been used.
ing device is then employed to lock the three flask mem
bers into a rigid assembly. Since the ridges 17 of side
walls 15 extend into the material of the second upper
flask member, there can be no lateral shifting of this
piece with respect to the bottom member. After the
investment material hardens, the mold is completed and
the flask may be opened and the wax removed from the
metal bridge, as by placing the flask in boiling water.
The acrylic material used to form the teeth of the dental
l0 bridge is then placed in the mold cavity and the flask
assembly. The clamping device comprises, preferably,
is locked up with the presses. The acrylic material is
then cured to secure its integration with the metal bridge.
Thereafter, investment material in which the completed
bridgework is embedded is removed from the flask and
a pair of presses which are identical in construction so
that only one need be described. The press has a frame
investment material with a suitable tool.
A clamping device is provided for forcing the three
flask members into intimate engagement with each other
and for locking the thus engaged members into a rigid
40 containing a pair of upright members 41 which are
spaced apart a distance sufficient to span the flask as
shown in FIGURE 2. As seen in FIGURE l when the
the bridgework is dislodged by tapping the hardened
Inasmuch as many apparently different embodiments
of the invention can be made without departing from its
spirit or scope, it is intended that what has been shown
press is in position on the flask, -the upright members 20 in the drawings and described in the specification be
41 are canted away from the center of the flask. The
reason for this is so that the pressure applying platen
interpreted as illustrative and not in a limiting sense.
What is claimed is:
A clamping device for use with a three member hinged
dental flask having a base member with upstanding side
thereby force the upper flask member both towards the
other upper flask member and towards the base member 25 wall elements, a flrst arcuate upper flask member piv
otally connected to one end of said base member and
rather than towards the other upper flask member alone
42 can engage an upper flask member obliquely and
swingable into cooperative relationship with half of said
as in my hereinabove referred to patent. The base por
sidewall elements and a second arcuate upper flask mem
tion 43 of the press is enlarged so that even though the
ber pivotally connected to the other end of said base
upright members are canted rearwardly, the press will
be capable of standing on a horizontal surface. The 30 member and swingable into cooperative relationship with
the other Ihalf of said sidewall elements, said clamping
upper cross member 44 joining upright members 41 is
device comprising a lower cross member, a pair of spaced
provided with an internally threaded aperture 45 through
apart upright members extending upwardly from said
which passes the threaded stud 46 to which is rotatably
lower cross member, said upright members being spaced
secured platen 42. The upper end of the stud is provided
with a handle 47 whereby the stud may be rotated and 35 apart a distance sufllcient to permit the dental flask
to fit therebetween, an upper cross member joining the
pressure applied to platen 42. After a press as herein
top ends of said upright members, said upper cross mem
described is used to tighten the flask and bring the
ber having a threaded aperture provided therein, a
flask members into intimate engagement, the press may
threaded stud cooperating with and extending through
be removed and a clamping device as described in Pat
ent 2,896,259 may be used to lock the flask members 40 said threaded aperture, a platen rotatably fastened to
the lower end of said stud for engaging an upper flask
together during the curing process.
member, andV handle means secured to the opposite end
In operation, the platform 12 is placed in the base
of said stud whereby the stud may be rotated to place
flask member 10 and between the sidewalls 15 thereof.
pressure on a flask inserted in the clamping device char
Investment material in plastic form is then a bed on
acterized in that said upright members are canted rear
which the dental bridge is added until it is in line with
wardly so that when the threaded stud is rotated to place
the top of the side member 15 so that the edges 17 of
pressure on the flask the pressure is applied diagonally
member 17 project well above the material. A metal
to urge the upper flask member about its pivot and the
bridge or denture having a full plate is then embedded
lower cross member has an enlarged base extending below
in the investment material with the wax teeth formed
the upper parts of the clamping device so that said device
thereon aligned with the surface of the investment ma- '
terial which is then permitted to harden. Thereafter,
investment material in plastic form is placed in one up~
per flask member which is then swung into engagement
with the wax teeth pattern so that an impression of the
outer surface of the “teeth” is formed in the investment
material. The edges 17 of sidewalls 15 extend into the
material so that after the material hardens there can be
no lateral shifting, between the upper and the lower flask
members. Next, the other flask member is filled with
soft investment material and it is swung into engage
ment with the remainder of the flask, so that the wax
teeth pattern forms a mold in the material. The clamp
is self supporting in an upright position.
References Cited in the ille of this patent
Griswold ____________ __ Sept. 17, 1895
Bragg _______________ __ Aug. 4, 1896
Andrews ____________ __ June 22, 1897
Lewis _______________ __ Mar. 17, 1903
Cline _______________ __ Nov. 9, 1948
Myerson _____________ __ Nov. 4, 1958
Harris _______________ __ July 28, 1959
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