U.S. patent number 3,837,351 [Application Number 05/332,669] was granted by the patent office on 1974-09-24 for interdental tooth cleaner and method for making same.
Invention is credited to Thomas F. Thornton.
United States Patent |
3,837,351 |
Thornton |
September 24, 1974 |
INTERDENTAL TOOTH CLEANER AND METHOD FOR MAKING SAME
Abstract
A continuous length of interdental tooth cleaner consisting of
textured yarn that is composed of deformed filaments that are
covered with a hardened resin to stiffen them and in which the yarn
is processed to increase its normal bulkiness.
Inventors: |
Thornton; Thomas F. (New
Canaan, CT) |
Family
ID: |
23299295 |
Appl.
No.: |
05/332,669 |
Filed: |
February 15, 1973 |
Current U.S.
Class: |
132/321 |
Current CPC
Class: |
A61C
15/041 (20130101) |
Current International
Class: |
A61C
15/04 (20060101); A61C 15/00 (20060101); A61c
015/00 () |
Field of
Search: |
;132/89,93,92,91,90 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McNeill; G. E.
Assistant Examiner: McNeill; Gregory E.
Attorney, Agent or Firm: Junkins; Ernest M.
Claims
I claim:
1. An interdental tooth cleaner comprising a length of textured
yarn formed of a plurality of filaments that have been individually
permanently deformed and crinkled throughout the length of the
cleaner and a covering of hardened material on the filaments to
increase their stiffness and memory, said length normally being
bulky by the filaments being maintained deformed and crinkled but
becoming essentially straightened by an elongating force that
decreases its bulkiness and in which said length returns to being
bulky upon removal of the elongating force.
2. The invention as defined in claim 1 in which the filaments of
the yarn are somewhat disentangled to increase the bulkiness of the
cleaner.
3. The invention as defined in claim 1 in which the filaments are
formed of plastic material and in which the covering material is
also a plastic material.
4. The method of making a continuous length of interdental tooth
cleaner comprising the steps of supplying a continuous length of
textured yarn formed of a plurality of individually deformed and
crinkled filaments, increasing the bulkiness of the yarn by
somewhat disentangling the filaments and forming a hardened coating
on the somewhat disentangled filaments.
5. The invention as defined in claim 4 in which the step of
increasing the bulkiness includes the step of exerting a stretching
force on the yarn and then decreasing the stretching force.
6. The invention as defined in claim 5 in which the forming of a
hardened coating includes the step of applying a liquid resin to
the filaments and in which there is the step of hardening the
coating while the filaments have the decreased stretching force
applied thereto.
7. The invention as defined in claim 6 in which the liquid resin is
applied while the stretching force is applied to the filaments.
8. The invention as defined in claim 6 in which the step of
applying the liquid resin occurs after the stretching force has
been applied to the filaments and then decreased.
Description
The present invention relates to a length of yarn which is used
like dental floss for insertion into crevises formed between
adjacent teeth to clean the crevices. In most instances the
adjacent crowns of the teeth forming the crevice are quite close
together, if not touching, and the cleaner to be effective must
pass through the adjacent crowns into the crevice. However, as most
crevices are wider than the crowns, the cleaner, if small enough to
be capable of passing past the crown, is not large enough to
essentially fill the crevice to enable effective cleaning action by
the removal of particles therein and the scrubbing of the crevice
forming surfaces of the adjacent teeth, while if large enough to
effectively clean the teeth, will not pass through the crowns.
In my co-pending application Ser. No. 138,501, filed Aug. 21, 1971,
now abandoned, there is also disclosed a teeth cleaner having a
bulky portion and a reduced diameter string portion. While such a
cleaner has been found to be completely satisfactory, it was not
capable of being processed as a continuous length cleaner so that
the user may sever from a supply the length of the bulky portion
which was desired to be used.
It is accordingly an object of the present invention to provide an
interdental tooth cleaner which may be made in a continuous length
and yet be effective in removing particles and cleaning the
crevices between adjacent teeth.
Another object of the present invention is to provide a teeth
cleaner which may be easily inserted into the crevice past the
close crowns by having its thickness decreased, but yet revert to
an enlarged bulky state in the crevice to substantially fill the
crevice so as to engage the surfaces of the teeth forming the
crevice.
A further object of the present invention is to provide a method
for making a continuous length dental cleaner from a length of
textured yarn which achieves the above objects and in which the
bulkiness of the cleaner is increased over that which the yarn
originally possessed.
In carrying out the present invention, the interdental cleaner
consists of a continuous length of textured yarn that has been
coated with a hardened resin to increase its stiffness and memory.
One form of yarn which may be utilized in a 600 denier textured
yarn formed of nylon filaments in which the filaments have been
processed to be permanently crinkled or otherwise deformed from
their normal straight condition. The yarn filaments are covered
with a hardened covering, such as nylon resin.
The process of making the cleaner not only involves providing the
hardened covering but also includes the step of increasing the
bulkiness of the yarn. This is achieved by exerting an elongating
force on the yarn that tensions the yarn and causes the filaments
to become somewhat less entangled after a removal of the tension so
that the normal and inherent bulkiness of the yarn is increased.
The covering may be applied as a liquid during the tensioning or
after and then hardened with the hardening occurring while
substantially no tension is exerted on the yarn and thus the
covering serves to maintain the increased bulkiness thereof.
In use, a desired length of cleaner is severed from a continuous
supply thereof and the user stretches, by tensioning, a short
portion between his fingers which minimizes the thickness of the
cleaner. This stretched portion is passed through the contact
points at the crowns of adjacent teeth defining the crevice and
into the crevice. The tension is then released which enables the
cleaner to assume its normal bulky state wherein it substantially
fills the crevice. One end of the cleaner is then pulled, to draw
the clenaer through the crevice and in so doing, cause dislodgement
of particles therein while also tending to scrub the surfaces of
the teeth defining the cavity.
Other features and advantages will hereinafter appear.
In the drawing:
FIG. 1 is a diagrammatic representation of the method of forming a
continuous length of interdental tooth cleaner of the present
invention.
FIG. 2 is a representation of a length thereof.
FIG. 3 is a view showing the applying of an elongating force to
reduce the diameter of the cleaner for insertion past the
crowns.
FIG. 4 is a view of a further embodiment of the method of making
the cleaner.
Referring to the drawing, the continuous length of interdental
tooth cleaner of the present invention is generally indicated by
the reference numeral 10 and is wound as a continuous length on a
spool 11 after being formed by the process that includes the
apparatus shown in FIG. 1.
As shown in FIG. 1, a strand of continuous length 600 denier
textured yarn is drawn from a spool 12 through a squeeze block 13
by a set of rollers 14. The yarn between the squeeze block 13 and
the rollers 14 is stretched by a tension of perhaps 3 pounds. The
yarn is then sprayed by a sprayer 15 with nylon resin that is
dissolved in a solvent such as alcohol so that the filaments of the
yarn become covered with the liquid. The solvent is evaporated by
use of a heat dryer 16 which by eliminating the solvent causes the
nylon resin to form a hardened covering on the filaments. A pair of
feed rollers 17 draws the yarn through the sprayer 15 and the dryer
16 after which it is subsequently wound on the spool 11 as the
continuous length interdental teeth cleaner.
The rollers 14 and 17 are preferably mechanically interconnected
with the rollers 17 being driven at a slightly lesser rate than the
rollers 14. The lesser rate is such as to exert substantially no
tension on the yarn between the rollers which enables the yarn to
contract to a shorter length than it had when withdrawn from the
spool 12. However, its bulkiness is greater. The spool 11 winds the
cleaner 10 without any substantial tension thereon so that the
cleaner on the spool 11 is at its normal bulky state.
In use, a user cuts the desired length of the cleaner 10 from the
spool 11 and places a portion thereof, such as a portion 18,
between the fingers and exerts a pulling force thereon as shown in
FIG. 3, which substantially reduces the thickness of the yarn by
basically straightening the filaments to eliminate the deformities
of the filaments that cause the yarn to be textured. The portion 18
is then easily inserted through the contact point at the crowns of
the teeth in the same manner as normal straight filament dental
floss. The user thereupon releases the tension and the cleaner
assumes its normal bulky condition as shown by the portions thereof
that are not under tension. A slight pull on the end of the cleaner
draws it through the crevice and as it is in its normal bulky
condition, it substantially fills the crevice to dislodge any
particles of food while also exerting a cleaning action on the
surfaces of the teeth defining the crevice.
It has been found that where a continuous filament strand of
textured nylon yarn of about 600 denier is used, it will stretch
approximately twice its length with a small pull of perhaps two or
three pounds. In addition, as shown by the portion 18, the pulling
shrinks the diameter from approximately 1/8 to about 1/48 inch so
that the tensioned diameter is perhaps 1/6 of the normal or relaxed
diameter. While one specific size of yarn has been disclosed, it is
contemplated that other sizes may also be employed.
Shown in FIG. 4 is another embodiment of the present invention in
which the liquid resin is contained within a bath 19 located
between the rollers 14 and the squeeze roll block 13. The yarn is
immersed in the bath 19 to have its filaments coated. It may then
be either passed beneath the sprayer 15 for additional contact with
the liquid resin or not and then passed through to the dryer 16 to
cause evaporation of the solvent. In either event, the tension on
the yarn at the dryer is less than the tension between the rollers
14 and the squeeze block 13 and preferably essentially no tension
exists so that the yarn, while having its nylon coating hardened,
will be in a relaxed state and thus will have an increased
bulkiness over that which the yarn has when drawn from the spool
12. The bulkiness is caused by the filaments becoming somewhat less
entangled after being stretched and the hardened covering maintains
this state of a larger diameter or bulkier cleaner 10. However, the
hardened covering still enables a tension to produce a small
diameter straight portion, such as the portion 18 for easy
insertion into the crevice.
It accordingly will be appreciated there has been disclosed an
interdental tooth cleaner which may be formed as a continuous
length of textured yarn that has had its filaments covered with a
hardened covering. The user severs a desired length of the cleaner
from a supply and any portion of the cleaner may have its bulkiness
substantially reduced merely by exerting a small tension thereon so
that the reduced diameter portion may pass into a crevice between
the points of contacts of the crowns of adjacent teeth. Within the
crevice, the cleaner returns to its normal bulky condition to
substantially fill the crevice and enable the filaments of the yarn
with their hardened covering to be pulled through the cavity to
dislodge particles therein and also to rub against the tooth
surfaces.
Variations and modifications may be made within the scope of the
claims and portions of the improvements may be used without
others.
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