U.S. patent number 3,722,833 [Application Number 05/088,738] was granted by the patent office on 1973-03-27 for method of spatulating packaged dental filling.
This patent grant is currently assigned to Inoue Japax Research Incorporated. Invention is credited to Kiyoshi Inoue, Akihiko Shimizu.
United States Patent |
3,722,833 |
Inoue , et al. |
March 27, 1973 |
METHOD OF SPATULATING PACKAGED DENTAL FILLING
Abstract
Pre-packaged dental filling ingredients for use by dentists. The
ingredients which are in part liquid and in part powder are
encapsulated and sealed tightly in a flexible-membrane formed bag
and therein separated one from the other which separation is
released by the compression of the bag to cause the ingredients to
be successively brought into contact and mixed together. The
mixture, confined within the bag, is spatulated to form a paste or
semi-solid, ready for application to a patient's tooth. The
spatulation may be carried out advantageously with apparatus
adapted to compressively roll over the flexible bag supported on a
surface or squeeze the bag against the surface.
Inventors: |
Inoue; Kiyoshi (Tokyo,
JA), Shimizu; Akihiko (Sagamihara, JA) |
Assignee: |
Inoue Japax Research
Incorporated (Yokohama-shi, Kanagawa, JA)
|
Appl.
No.: |
05/088,738 |
Filed: |
November 12, 1970 |
Foreign Application Priority Data
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|
|
|
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Nov 15, 1969 [JA] |
|
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44/92248 |
Nov 15, 1969 [JA] |
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44/92249 |
|
Current International
Class: |
B01f 013/08 () |
Field of
Search: |
;206/47A,63.5
;259/DIG.20,72,1R,DIG.46 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Jenkins; Robert W.
Assistant Examiner: Coe; Philip R.
Claims
We claim:
1. A method of preparing a dental filling in paste form from a
plurality of starting materials including a liquid and a powder,
comprising the steps of:
encapsulating within a flexible-membrane-formed bag premeasured
quantities of said liquid and said powder with one separated from
the other therein,
providing a compressive motion onto said bag by squeezing it
between a flat surface and a convex surface at a pressure and of
character sufficient to release said separation, thereby causing
said liquid and powder to be successively brought into contact and
mixed together to form a paste within the confined space of said
bag, the zone of compression shifting progressively over the bag to
cause the paste to be spatulated within said bag, and
applying an oscillatory magnetic field to said bag and the mixture
therein as said bag is being squeezed, said magnetic field inducing
an electric current of microampere order to pass through said
mixture.
2. A method of preparing a dental filling in paste form from a
plurality of starting materials including a liquid and a powder,
comprising the step of:
encapsulating within a flexible-membrane-formed bag premeasured
quantities of said liquid and said powder, providing a separation
barrier between them,
exerting a squeezing force on the bag to rupture the separation
barrier and to mix the liquid and powder together to form a paste
within the confined space of the bag, while shifting the force
progressively over the bag to cause the paste to be spatulated
within said bag, and
applying an oscillatory magnetic field to said bag and the mixture
therein while said squeezing force is being exerted, said magnetic
field inducing an electric current of microampere order to pass
through said mixture.
Description
BACKGROUND OF THE INVENTION
The invention is in the field of dentistry and especially relates
to a method of preparing a dental filling in paste or semi-solid
form based on the new concept.
When a dentist prepares a dental filling from a plurality of
ingredients, it has hitherto been a common requirement that he
accurately measure out such ingredients from vials or the like
containing individual ingredients and mix them together with
instruments or utensils. This has been necessary because of the
fact that they must be mixed together immediately before use. One
of such ingredients is commonly a liquid or a number of different
liquids and the other is a powder or a number of powders or
different materials which are reactable or complementary to such
liquid appropriate to the kind and type of a desired filling, and a
suitable procedure must be made during the mixing stage to
accomplish reactions uniformly over the entire region of the powder
and liquid in a relatively short time. For example, when such a
filling as zinc-phosphate, silicate or silico-phosphate cement is
to be prepared, the liquid is an aqueous solution containing
phosphoric acid, and the powder is made up from one or more of zinc
oxide, silicon oxide and aluminum oxide, along with one or more
additives, the exact composition depending on the particular cement
desired, and the powder and liquid are mixed together and
spatulated fully until the mixture becomes a paste which can be
applied to a patient's tooth or teeth. In phenomenon, when the
powder and liquid are brought into contact, exothermic reactions
are brought about to form phosphate, acid phosphate and other
products in crystal and noncrystal forms, with the local
crystalization being apparently followed by the solation and
gelation of the mixture while the paste commences and proceeds
setting or curing with a final structure in which unreacted cores
of powder are distributed among the reaction formed crystals.
Quantities of starting materials to be measured out and control of
these complex reactions which are to be accomplished in a
relatively short time are critical inasmuch as these are factors
largely governing the final structure of the fully set product
which determines the quality thereof as a dental filling. However,
heretofore, these factors have been left to dentists who will
attend to mixing or spatulation procedure in various conditions and
at various levels of skill for such procedure. Moreover, it has
been common, especially where spatulation procedure and the like is
essential, that such is carried out with the mixture exposed to the
environmental atmosphere whose conditions vary from season to
season and from place to place. As a consequence, the strength and
other quality characteristics of the resulting filling have largely
varied depending on the humidity and the temperature of the
particular environment in which it is prepared. The quality values
have been often inferior to required standard values and this
tendency is rather common in the humid and hot seasons.
SUMMARY OF THE INVENTION
It is the primary object of the present invention, therefore, to
provide an improved technique which makes it possible to prepare
from a plurality of starting materials a dental filling of a
superior quality, i.e. compressive strength, hardness, freedom of
dimensional change (expansion or shrinkage), adhesiveness and
interlockability, practically independently from the environmental
conditions in which the filling is prepared.
Another object of the present invention is to provide a method of
preparing a dental filling which relieves the dentists of the
tedious bother of actually measuring out starting materials or
ingredients as heretofore required and enables fabrication of a
dental filling of superior characteristics to those heretofore
obtained in standard conditions.
These objects and others which will become apparent hereinafter,
are attained in accordance with the present invention, by our novel
concept of packaging in mutual separation until just before use a
plurality of premeasured substances adapted to form a dental
filling, i.e. paste cement or amalgam, and releasing the separation
to cause said separated substances to be successively brought into
contact and mixed together and effecting reaction therebetween
controlledly and uniformly within a confined space isolated from
the atmosphere under compressive or squeeze action applied to the
mixture. In accordance with an important aspect of the invention,
there is provided a capsule comprising a flexible-membrane formed
bag enclosing premeasured amounts of the substances which are
tightly separated from one another in the bag, said separation
being releasable by the compression of the bag to cause the
substances to be successively mixed together within the bag, the
latter being of thickness and material adapted to withstand said
compression and for rupture or breakage only by the user's purpose
to take out the mixture or product for clinical use.
The invention is applicable to any of the dental fillings available
and the plural substances for packaging in a bag are those choosen
respectively depending on the particular end product desired. For
example, for a zinc-phosphate cement, the first substance is a
power containing zinc oxide and for a silicate cement, the powder
contains mainly admixed silica and alumina. As is well known,
various additives may be admixed to these oxides to facilitate
and/or control exothermic reactions brought about as the primary
constituent and a liquid are mixed together. Common to these
particular cements, liquid is constituted by or contains an aqueous
phosphoric acid solution. Also for a water settable phosphate
cement, the powder may be of phosphate salt and/or acid phosphate
salt and the liquid a suitable solvent such as water or alcohol.
For amalgam, the liquid is mercury and the powder copper or copper
alloy.
The bag may be a thin rubber, plastic, natural or synthetic resin
and requisites of the material forming same are flexibility and
toughness to withstand the compressive force applied thereto as
well as non-destructability by liquid and exothermic reactions.
Among others, a polyester has been found highly suitable for this
purpose.
For the purpose of the present invention, the package is divided
into plural compartments which are filled with a liquid or liquids
and powder or powders, respectively, the package being tightly
sealed to separate the contents from the environment. To this end,
a pack may be prepared of a diaphragm filled with a liquid for
enclosure as a first compartment within the flexible bag with the
space between the outer surface of this diaphragm and the inner
surface of the bag filled with powder forming the second
compartment. In this case, the pack may comprise a plurality of or
series of sub-packs filled with liquid and distributed or embedded
among the powder. To enable release of the separation between the
liquid and the powder, the diaphragm forming the liquid pack may be
of material, thickness or character to permit rupture by the
compression of the outer flexible bag. Alternatively, the sealed
package with plural separated compartments can be prepared by
bonding portions of the bag so as to sealingly separate the liquid
or liquids from the powder or powders, this bond being sufficiently
tight to prevent release of the separation in the absence of such
compressive force are applied to the bag for mixing purpose.
According to a preferred embodiment of the invention, a plurality
of packages set forth above may be prepared which are
disconnectably linked in series to permit the dentist to separate
one from the series at his need.
The method of preparing a dental filling in a paste or semisolid
form making use of a sealed package with separated ingredients or
starting substances, according to the present invention, includes
applying a compressive, squeezing force to the flexible package
supported on a suitable surface in the atmosphere or preferably
within a coolant or temperature-controlled fluid so as to cause the
separated substances to be successively brought into contact and
spatulated sustaining reactions between them within the confined
space of the package. While any known instrument may be used to
spatulate the mixture left in the closed space, we prefer to this
end the use of a rotary member adapted to unidirectionally
reciprocatingly roll over the package against a supporting surface
under compression or relatively convex members or surfaces adapted
to squeeze the package between them.
DESCRIPTION OF THE DRAWINGS
FIG. 1A is a sectional view of a capsule embodying the principles
of the present invention;
FIG. 1B is a cross-sectional view of the embodiment on the line
1B--1B of FIG. 1A;
FIG. 2 is a sectional view of another form of the capsule according
to the invention;
FIG. 3 is a plan view of another embodiment of the capsule
according to the invention;
FIG. 4A is a plan view of a capsule of the invention embodied in
another form;
FIG. 4B is a cross sectional view of the capsule taken on the line
4B--4B of FIG. 4A;
FIG. 4C is a cross sectional view of a similar capsule;
FIG. 5 is a diagrammatic view of apparatus for performing the
spatulation procedure according to the present invention;
FIG. 6 is a diagrammatic enlarged view illustrating a spatulating
procedure according to the invention;
FIG. 7 is a diagrammatic top view of another form of a
hand-operated spatulator according to the invention;
FIG. 7A is a side elevational view of the apparatus of FIG. 7;
FIG. 8 is a sectional view in a diagrammatic form of a
motor-operated spatulator according to the present invention;
FIG. 8A is a top view in cross section of the spatulator of FIG.
8;
FIG. 9 is a diagrammatic representation of another form of
spatulating apparatus according to the invention;
FIG. 10 is a side-elevational view of still another form of a
motor-operated spatulator and FIG. 10A is a front view, partly
fragmentary, thereof; and
FIG. 11 shows rotary members of various configuration useful in
performing the spatulation procedure according to the present
invention.
DETAILED DESCRIPTION
In FIGS. 1A and 1B there is shown one illustrative embodiment of
our novel dental capsule packaging a liquid and a powder in tight
mutual separation. The capsule 1 is in the form of a closed bag
made from a flexible membrane 2 whose interior is divided into
multiple compartments filled with individual ingredients or
starting substances, here, into two compartments 3 and 4 filled
with a liquid and a powder, respectively, and separated by a
flexible diaphragm 5. In this example, the latter diaphragm is of a
material, thickness and character adapted to tightly separate
liquid and powder normally but for rupture to release the
separation when compressive, squeezing action is applied to the bag
1 as will be described. The membrane 2 forming the bag 1 is
sufficiently flexible, tough and thick to withstand such
compressive, squeezing action so as to confine the mixture within
the space isolated from the environment. This capsule may be a pair
of tubes closed at both ends with the first tube 5 filled with a
premeasured amount of liquid and the second tube 2 containing a
premeasured amount of powder in the space between its inner wall
and the outer wall of the liquid-filled closed tube to form a
sausage-shaped container with two compartments filled with liquid
and powder respectively. For the user's convenience, a plurality of
such capsules may be prepared which are linked in series. Thus, the
user can cut the portion c to separate the terminal capsule from
the series for his intended use and spatulation procedure. The
capsule of FIG. 2 is shown to include a liquid compartment 3
subdivided into plural compartments each filled with a amount of
liquid complementary to those filled with the other subcompartments
relative to an amount of powder contained in the bag 2 in contact
therewith and the subcompartments. Each of the latter is adapted
for rupture as compressive, squeezing action is exerted, as will be
described.
In each single capsule which may be one of various forms as shown
before and hereafter, it is of course necessary to package specific
kinds of powder and liquid in accurately measured amounts and
proportion depending on the type and amount of a particular dental
filling. As set forth earlier, phosphate cements make use of a
powder containing oxides and a liquid containing an phosphoric acid
solution, or otherwise a powder containing phosphate salt and a
solvent liquid. The powder may include one or more additives to
improve the quality of a final product as formed. While innumerable
additives have been suggested by others, one of the joint inventors
of the present invention, Kiyoshi Inoue, has discovered that
inclusion up to 5 percent by volume of finely divided fibers (of
0.1 to 3 micron diameter and 0.5 to 20 mm length) of a synthetic
resin not detrimental to the tooth body (such as polypropylene,
trifluoride resin, vinyl chloride, chlorinated polyester,
polyethylene, furan, epoxy resin, polyester, phenol resin and the
like) greatly improves the compressive strength and the
interlocking strength of any of these cements as applied to a
tooth.
Shown in FIG. 3 is another embodiment of our novel capsule which is
in the form of a rectangular, relatively flat envelope in which two
compartments 3 and 4 sealed tightly from the environment are here
again filled with a premeasured quantity of liquid and a
premeasured quantity of powder respectively and interdivided by a
boundary 5' for isolating the accurately measured liquid and powder
from one another until just before a dental filling as the product
therefrom is desired for use. This boundary is for the indicated
function as well as the function to release the isolation to cause
these sealed contents to be mixed together. To this end, the
capsule may be prepared by overlapping two flexible, plastic (e.g.
polypropylene) sheets for a thickness, say, 0.05 mm and bonding the
overlapped sheets permanently except those portions for forming
compartments 3 and 4 and boundary 5', the latter being formed by
tightly but fluid-pressure releasably bonding the corresponding
overlapped portions of the sheets. In this case, the specific
manner of bonding the sheets and filling liquid and powder may be
that both elongated sides A and A' of the overlapped sheets are
permanently bonded and the sheets then semi-bonded along 5' or vice
versa. Thence premeasured amounts of powder and liquid (e.g. 1.0 g
powder and 0.36 cc liquid, for example, in the case of zinc
phosphate cement) are entered into regions 4 and 3 (each with three
sides closed) from open ends B' and B, respectively and finally the
regions B and B' are permanently bonded to a two-compartment
envelope as shown. The semi-bond at 5 is made at an adequate
tightness so as not to lose the bond under normal conditions but to
do so when a squeezing action is applied to the envelope from
region 3 to region 4 at a reasonable compressive force. To make
such semi-bond and permanent-bond selectively, a conventional heat
sealer is found highly suitable. In the mass production of a number
of identical packages as shown, identical bonding or sealing
conditions may be followed. To the completed envelope or package,
designation of a filling to be made, liquid and powder contents and
a specific manner of spatulation procedure may also be printed for
the user's convenience.
In FIGS. 4A and 4B, there is shown another form of capsule which is
here again a rectangular envelope formed from two plastic sheets
permanently bonded along the margin and having releasably separated
two compartments 3 and 4 filled with a liquid and a powder,
respectively. The liquid-filled compartment 3 may be a tube of a
rupturable diaphragm within the outer bag or envelope (FIG. 4B) and
in contact with the powder filled compartment 4 as in FIG. 1A, or
otherwise may be of membrane integral with the envelope and
semi-bonded along boundaries 5" as in FIG. 4C to separate the
liquid from the powder.
Thus, packages for the various types and amounts of various dental
fillings can be prepared and distributed to dentists who may merely
choose one package adapted for a particular clinical purpose
without the need of actually attending to, as heretofore, the work
of measuring out starting materials with high accuracy because of
high criticality of such accuracy largely influencing the quality
of the end product. The package, therefore, eliminates completely
not only the dentists' conventional need for such tedious
preparatory work but also the deterioration of product fillings due
to rough measuring of starting materials or entry of impurity as
have been often the case heretofore.
In FIG. 5 there is shown in a diagrammatic view a spatulator 10 for
forming a dental filling when used with a package illustrated in
the foregoing figures. The spatulator includes a base 11 provided
with a planar surface for supporting a package 1 securely in
contact thereon with a pair of clamps 12a and 12b. It also is
provided with a lever 13 whose one end 14 is hinged at a stand 15
secured to base 11 and its free end 16 is adapted for the user's
grip for the spatulation operation. Lever 13 has a cross arm 17
hinged at 18 which serves as a shank supporting a rotary member 19
adapted for free rotation about its axis 20 and the shank is also
spring-held with lever 13 as indicated. The rotary member 19 is
thus adapted to reciprocatingly roll over the package 1 squeezing
the latter against the supporting surface 11 as lever 16 is
reciprocatingly swung. The initial compression of the package will
rupture diaphragm 5 (FIGS. 1A, 1B, 2 and 4B) or release semi-bond
5', 5" (FIGS. 3 and 4C) to bring the liquid and powder together
within the capsule, with the subsequent squeezing with the roller
19 causing the liquid and powder to be homogeneously mixed together
effecting reaction as the compressed zone continuously shifts
between the two surfaces 19 and 11, one flat and one convex or
round, as shown in FIG. 6. Therefore, unlike the conventional
practice, not only is the spatulation advantageously carried out
isolated from the humidity of the surrounding atmosphere, but also
the heat generated by exothermic reactions is effectively scattered
or dissipated by relatively large surfaces which rollingly squeeze
the encapsulated mixture between them, with the quality of the
resulting product filling bearing practically no dependency on the
environmental conditions. Moreover, the spatulation with such an
encapsulated mixture permits no entry of any impurity which would
be detrimental to the quality of the product filling and does not
soil the area used therefor.
Furthermore, the spatulation operation is much simplified and the
user may simply repeat such a reciprocating squeeze by a given
number, say 50 to 200 times, with substantially a constant time of
each reciprocation although such parameters and the entire period
for the spatulation are choosen depending on the kind and
characteristics of a particular filling desired. Indeed, it has
been found that in this manner, fillings of any particular type are
prepared practically without variation in quality and of the
quality much superior to those having been attainable with standard
techniques.
With usual dental fillings as prepared through chemical and curing
reactions, the environmental temperature is sometimes or otherwise
often critical to the quality of the filling prepared and applied
for a given use where the temperature greatly influence the rates
of reactions involved in the paste forming stage. While with the
present invention, the heat generated by the exothermic reactions
is effectively scattered and thus such reactions are advantageously
held to proceed at moderate rates while the individual starting
materials are brought into contact and spatulated together, it is
sometimes desirable to control the environmental temperature
especially where the latter differs much from an optimum or
standard temperature at which particular filling materials are made
into pastes. For such situations, a temperature control may be made
here by maintaining the temperature of plate 11 at a desired value
(e.g. circulating a temperature of plate 11 at a desired value
(e.g. circulating a temperature-control fluid therethrough of
contacting a temperature control electronic element thereto) or
preferably immersing in a temperature-control fluid the region of
capsule 1 subjected to compressive squeezing action.
In FIG. 7, there is shown another form of hand-operated spatulator
according to the present invention. This embodiment includes a
rotary member 119 which is rotatably supported by a grip 116 via a
shaft 125 which is journaled either on roller 119 or grip 116 and
secured with the other. On a spatulating plate 111, there is
secured a package 1 such as is shown in FIG. 3 with a pair of
spring clamps 112a and 112b stretching the package between them and
the user may hold the package in a position and in contact with a
supporting surface 111 with two fingers of his left hand. The
operator may hold grip 116 with his right hand, bring rotary member
119 upon the package 1 and squeeze the package against surface 111.
The peripheral surface of the rotary member is here made
sufficiently frictional relative to the surface of package 1 and
forming this member of a rubber and providing cracks thereon as
shown are found highly advantageous to promote the squeezing
action.
The spatulation process according to the present invention may also
be carried out, when the economy permits, while passing an electric
current of microampere order through the mixture subjected to
compressive and squeezing action. To this end, as shown in FIG. 7A
an electromagnet 127 is provided behind spatulation plate 111 as
wound by a coil 128 connectable with an alternating-current or
pulse sources 129 via switch 130. It will be seen that the closure
of switch 130 causes electromagnet 127 to create an oscillatory
magnetic field which by electromagnetic induction creates an eddy
current through the mixture spatulated within capsule 1. This
electric treatment is found to yield 15 to 20 percent increase in
hardness of resulting cements.
In FIGS. 8 and 8A, we show a motor-operated spatulator using a pair
of rotary members 1 and 2 for compressively squeezing a capsule
between them as they are relatively displaced. In this spatulator,
the capsule is clamped on the periphery of first rotary member 1
along 1b-1c as shown FIG. 8A, adapted in contact with the periphery
of second rotary member 2 whose shaft 2a is rotatably secured to an
arm 3 which at its one end 3a is hingedly as secured to a cover
table 9. The other end 3b of this arm is biased by a tension spring
4a connected with a biasing means so as to urge rotary surface 2
against first rotary member 1 at a suitable pressure adjusted by
biasing means 4.
The drive means for these rotary members comprises a motor 5
mounted on base 8 and whose output shaft is connected by a
reduction transmission 6 with the shaft 1a journaled through
bearing 9b, to rotate the first rotary member 1 in one direction
and to inductively rotate second rotary member 2 in the opposite
direction by the friction between the contacting surfaces. Such
rotary motion is preferably reciprocal rotary motion and, to this
end, a rotation reciprocator 7 is provided for motor 5 and can be
such that a predetermined angle of rotation in one direction of
motor 5 operates a limit switch to reverse the direction of
rotation of the motor.
In order to enable the operation in a temperature controlled
condition which, as set forth earlier, is desirable when the
environmental temperature differs considerably from an optimum or
standard temperature at which the spatulation is to be made, the
apparatus may be equipped with a suitable temperature control
means. To this end, a housing 10 is here mounted on cover table 9
for reception of a coolant or temperature control liquid as
supplied through a conduit 11 and a valve 12 and a suitable gasket
9a is provided to prevent leakage of the liquid which immerses
rotary members 1 and 2 and the region of spatulation.
In operation, after a capsule is clamped on the specific location
of the periphery of first rotary member 1, bias means 4 is adjusted
to urge second rotary member 2 against the first at a pressure
which would be sufficient to release the separation of the divided
contents within the capsule when the latter is brought into the
interface of these relatively urged members. Container 10 is
mounted on cover 9 with gasket 9a and a fluid is fed into the
container from pipe 11 by opening valve 12 until rollers 1 and 2
are sufficiently immersed within the liquid. Then, motor 5 is
switched into drive and rotary member 1 carrying the package is
reciprocatingly turned by an angle while rotary member 2 is
inductively turned by the corresponding angle to reciprocatingly
squeeze the capsule progressively compressed between them. The
pressure increase of the liquid compartment during the initial turn
will release the separation between the liquid and powder which are
then homogeneously spatulated in situ within the confined space of
the capsule by holding motor 5 in operation for a given time
period. Therefore, the quality of the resulting product filling is
totally independent of the user's skill.
In the embodiment shown in FIG. 9, a capsule is again held on a
rotary member 1 but a pair of other rotary members 2 and 2' each
with a diameter greater than that of rotary member 1 are used to
squeeze the capsule as the latter carried on first rotary member is
urged against the other two rotary members alternately. Rotary
member 2 is rotated in one direction by a motor 18 through a pulley
14a continuously and rotary member 2' is rotated in the opposite
direction by a pulley connecting same with rotary member 2. A cam
13 is provided driven by a motor 18 synchronously with rotary
members 2 and 2'. First rotary member 1 is rotatably held by a
support member 1b which extends through a leaf spring 16 to an arm
15, these members being hinged at 15a and the one end of arm 15
being in contact with cam surface 13 as urged by expansion spring
17.
In FIGS. 10 and 10a, we show another form of method and apparatus
for performing the spatulation of an encapsulated filling material
in accordance with the present invention. In this embodiment, a
capsule is held on a planar surface 2 as in some of previous
FIGURES and squeezed thereagainst by a rotary member 1. The rotary
member 1 has a shaft 1a rotatably journaled and resiliently held by
spring 4 in an aperture 3a formed in an upright extending arm 3.
The lower end 3c of this upright arm is pivotally secured to the
lateral face of machine base 8 and hinged to make the arm 3
swingable in a plane perpendicular to spatulation surface 2a.
Intermediary of the upper end portion 3a and the lower end 3c, the
arm is formed with an elongated aperture 3b of a length
substantially equal to the diameter of a disk 5 as will be
described. The disk 5 is rotated via a reduction transmission 7 by
a motor 6 mounted on the base 8 and has on one of its face a
protrusion 5a as shown which is adapted to be slidably engaged in
aperture 3b so that the rotation of motor 6 causes protrusion 5a to
travel along a circle while being slidably held in aperture 3b of
the arm 3 which thus reciprocatingly swings over an angle about
hinge 3c to cause rotary member 1 to reciprocatingly roll over
surface 2a by friction compressing the package thereagainst under a
pressure effected by spring 4.
In FIG. 11, there are shown rotary members of various forms which
may be used with the foregoing apparatus. Each of these rotary
members may be made from a plastic and preferable from a material
having a high thermal conductivity such as aluminum to dissipate
the heat generated by reactions to the extent that such reactions
are carried on at a controlled rate. Also, if desired, a cooling
element may be embedded in the rotary member.
* * * * *