U.S. patent number 3,653,389 [Application Number 05/003,682] was granted by the patent office on 1972-04-04 for disposable forceps.
This patent grant is currently assigned to AMP Incorporated. Invention is credited to Suel Grant Shannon.
United States Patent |
3,653,389 |
Shannon |
April 4, 1972 |
DISPOSABLE FORCEPS
Abstract
Disposable forceps are molded from a suitable sterilizable
plastic material and they have a pair of arms joined together at
inner ends by a hinge section of reduced cross-section so that
outer sections of the arms are disposed substantially parallel to
each other when the arms are in their normally inoperative
position. When the arms are operated, the outer ends of the teeth
engage before or simultaneously with the engagement of the
innermost ends of the strengthening ribs. Alignment lugs are
provided on an inside surface of each arm which have mateable
surfaces to prevent any transverse misalignment between the teeth
during engagement therebetween and outer ends of the alignment lugs
engage recesses in the inside surfaces of the arms to prevent
overstressing and rocking of the teeth.
Inventors: |
Shannon; Suel Grant
(Harrisburg, PA) |
Assignee: |
AMP Incorporated (Harrisburg,
PA)
|
Family
ID: |
21707059 |
Appl.
No.: |
05/003,682 |
Filed: |
January 19, 1970 |
Current U.S.
Class: |
606/210;
294/99.2; D28/55; D24/143 |
Current CPC
Class: |
A61B
17/30 (20130101) |
Current International
Class: |
A61B
17/30 (20060101); A61b 017/30 (); B25b
001/02 () |
Field of
Search: |
;128/321,346,354 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Pace; Channing L.
Claims
The invention is claimed in accordance with the following:
1. In a forceps having a pair of elongated arms projecting
longitudinally from a unitary connecting section, with tips
adjacent to the free ends of said arms being engageable upon
pivotal action of said arms toward each other, the combination
comprising:
a pair of diverging portions of said arms projecting longitudinally
from said connecting section,
a pair of elongated straight sections unitary with and projecting
longitudinally from said corresponding diverging portions, each of
said diverging portions including a first flexible hinge section of
relatively thin cross-section immediately adjacent to the
connecting section, each of said diverging portions further
including a second relatively thick section unitary with and
immediately adjacent to a corresponding flexible hinge section,
said elongated arms being provided with corresponding elongated
strengthening ribs, each of said ribs projecting laterally from and
unitary with said relatively thick section and said elongated
straight section of a corresponding arm, each of said ribs having a
first end terminating at said relatively thin hinge section of a
corresponding arm to prevent strengthening of said hinge section,
each of said ribs having a second end projecting longitudinally
beyond a free end of a corresponding arm to define one of said
tips, and said tips of said ribs being provided with teeth, and
said tips of said ribs being provided with teeth, which teeth are
interengageable upon flexing of said hinge sections to allow
pivotal action of said arms toward each other, said second ends of
said ribs extending longitudinally beyond the free ends of said
arms and being tapered to define said projecting tips.
2. The structure as recited in claim 1, wherein, said first end
portions of said ribs are initially in opposed spaced relationship
and are engageable with said hinge section being retained in bowed
and generally diverging relationship upon pivotal action of said
arms toward each other.
3. The structure as recited in claim 1, wherein, each of said ribs
is continuous from its first end to its second end thereof, said
ribs having mutually opposed sinusoidal sections with a pair of
lugs protruding from each sinusoidal section and spaced
longitudinally along a corresponding rib, and said lugs of one rib
overlap the corresponding lugs of the other rib upon pivotal action
of said arms toward each other.
4. The structure as recited in claim 3, wherein said sinusoidal
section of each rib is located along said straight section of a
corresponding arm, said straight section is provided with a pair of
generally arcuate recesses on opposite sides of said rib at the
sinusoidal sections thereof, and each pair of lugs is provided with
a generally arcuate end portion for mating registration within
corresponding arcuate recesses to prevent any rocking motion of
said interengaged teeth and to define stop means for limiting the
pressure between said interengaged teeth.
5. The structure as recited in claim 1, wherein, said first ends of
said ribs are engageable to define a secondary pivot point for said
arms, and thereby shorten the effective working pivotal length of
said arms.
6. The structure as recited in claim 1, wherein, said first end
portions of said ribs are initially in opposed spaced relationship
and are engageable with said hinge section being retained in bowed
and generally diverging relationship upon pivotal action of said
arms toward each other, and wherein, said first ends of said ribs
are engageable to define a secondary pivot point for said arms, and
thereby shorten the effective working pivotal length of said arms.
Description
This invention relates to forceps and more particularly to improved
forceps molded from suitable sterilizable plastic materials.
Plastic forceps are known since they are readily molded from
sterilizable plastic material and they are capable of being
discarded after use due to the fact that they can be manufactured
for low cost.
Conventional forceps are in widespread use in hospitals, clinics
and doctors's offices because they can be economically marketed as
a presterilized package for a one-time use to remove sutures,
handle dressings, hold cotton to swab areas of a patient and other
medical uses. The forceps can, of course, be resterilized for reuse
if desired.
One drawback of these conventional plastic forceps is that the
areas adjacent the hinge point have the same thickness as or a
thickness greater than the arms which require relatively high
initial actuating forces to be exerted on the arms. Another
drawback is that the inner ends of the strengthening ribs engage
one another prior to the article-engaging teeth engaging each other
and this does not permit effectively engaging an article at the
initial engagement of the teeth. A further drawback is that the
teeth do not transversely align prior to engagement, which of
course, makes it difficult to grasp small items. An additional
drawback is the fact that the strengthening ribs have openings
therein as part of the aligning means which weakens the arms of the
forceps.
An object of the present invention is to provide plastic forceps
having sections of reduced thickness adjacent the hinged point so
that low pinching forces are required on the arms for initial
closure.
Another object is the provision of outer ends of article-engaging
teeth of the forceps engaging one another prior to or
simultaneously with the inner ends of strengthening ribs engaging
each other so that an article can be grasped with a minimum of
effort.
A further object is to provide aligning lugs to transversely align
the article-engaging teeth just prior to the outer ends of the
teeth engaging each other.
An additional object is the provision of the aligning lugs assuring
that there is proper axial alignment of the article-engaging
teeth.
Still a further object is the provision that the aligning lugs
define stop means to limit the pressure that the article-engaging
teeth exert on each other.
A still further object is to provide aligning lugs of the forceps
which will prevent any rocking motion of the article-engaging
teeth.
Other objects and attainments of the present invention will become
apparent to those skilled in the art upon a reading of the
following detailed description when taken in conjunction with the
drawings in which there is shown and described an illustrative
embodiment of the invention; it is to be understood, however, that
this embodiment is not intended to be exhaustive nor limiting of
the invention but is given for purpose of illustration in order
that others skilled in the art may fully understand the invention
and the principles thereof and the manner of applying it in
practical use so that they may modify it in various forms, each as
may be best suited to the conditions of a particular use.
IN THE DRAWINGS
FIG. 1 is a perspective view of a pair of forceps in its originally
molded and therefore normally inoperative position;
FIG. 2 is a side elevational view of the forceps of FIG. 1;
FIG. 3 is a view similar to FIG. 2 with the forceps at the initial
engagement of the article-engaging teeth when pinching forces are
applied to the arms;
FIG. 4 is a view similar to FIG. 3 illustrating the forceps when
the article-engaging teeth are fully closed;
FIG. 5 is a view taken along line 5--5 of FIG. 2; and
FIG. 6 is a view taken along lines 6-6 of FIG. 4.
Turning now to the drawing, forceps F are provided with arms 1
which are connected together at inner ends by a connecting section
2. Each arm 1 is provided with a hinge section 3, an inclined
section 4, a straight section 5 and article-engaging teeth 6.
Straight sections 5 taper from sections 4 to the outer ends of the
arms. Strengthening ribs 7 are provided on the inside surfaces of
sections 4 and 5 to strengthen arms 1 and inner and outer alignment
lugs 8 and 9 are disposed adjacent article-engaging teeth 6.
Strengthening ribs 7 in the area of lugs 8 and 9 have a sinusoidal
configuration and this permits the strengthening ribs to extend
from hinge sections 3 along sections 4 and 5 with article-engaging
teeth 6 being disposed in opposing surfaces of ribs 7.
Lugs 8 and 9 on each arm 1 are axially displaced with respect to
each other and also disposed on opposite sides of a medium plane as
illustrated in FIG. 5. The alignment lugs 8 and 9 have their inner
radiused and angular lead-in surfaces at outer ends thereof which
merge into straight guide surfaces to provide the alignment of the
teeth, and the lugs engage prior to the teeth 6 engaging to provide
the necessary transverse alignment of the teeth as the angular
lead-in surfaces of the outer lugs 9 engage each other; axial
alignment of the teeth 6 is accomplished during engagement between
the outer arcuate ends of the lugs and arcuate recesses 10 in which
these outer arcuate ends are disposed.
Lugs 8 and 9 align the teeth in a transverse direction and the lugs
and arcuate recesses 10 in which arcuate ends of lugs 8 and 9 are
received align the article-engaging teeth in an axial direction.
The article-engaging teeth 6 cannot be misaligned as a result of
the action of the aligning lugs 8 and 9 under normal gripping
pressure. Moreover, arcuate ends of lugs 8 and 9 and arcuate
recesses 10 define stop means to limit the pressure teeth 6 exert
on each other and also to insure complete engagement therealong.
The forward stop means constituting outer radiused ends of lugs 9
and arcuate recesses 10 in which they mate prevent any rocking
motion of teeth 6 when teeth 6 are fully engaged along their length
as illustrated in FIG. 4
Hinged sections 3 are not as thick as inclined sections 4 and
straight sections 5 to provide ease of closure of the forceps and
to permit bowing out when pressure at an inner pivot point, which
is provided by the inner ends of strengthening ribs 7, reaches a
stress condition thereby providing compensation to prevent the
hinged sections from breaking.
The tips of article-engaging teeth 6 can engage as illustrated in
FIG. 3 prior to or simultaneously with the engagement of the inner
ends of strengthening ribs 7 so that no excessive pressure is
needed to bring teeth 6 into initial engagement and the transverse
and axial alignment of teeth 6 are accomplished by alignment lugs 8
and 9 to assure the positive engagement of an article by
article-engaging teeth 6.
The initial engagement of teeth 6, when arms 1 are moved toward one
another as illustrated in FIG. 3, is such that sections 5 and all
of teeth 6 except the outer ones in engagement are disposed at an
angular disposition with respect to each other so that further
pressure on sections 5 cause the angular disposition to decrease
until all of the teeth are in engagement as illustrated in FIG. 4,
and the inner pivot point at the inner ends of strengthening ribs 7
when the inner ends are in engagement causes the hinge sections to
begin their bowing out function which allows the proper amount of
gripping pressure to be applied to the teeth and this action
removes the effect of the hinge sections on the pressure being
applied to the teeth. The engagement of the inner ends of the
strengthening ribs shortens the working length of the arms.
Ribs 11 are disposed along the outer surfaces of straight sections
5 to provide engaging areas for an operator to normally engage the
forceps between the thumb and forefinger of an operator so that the
ribbed area between lugs 8 and the junctions between sections 4 and
5 define grasping areas for normally grasping the forceps to
operate same.
The angular configuration of inclined sections 4 is such that one
would not normally handle the forceps here to operate the forceps
but would normally handle the forceps along the ribbed areas of
sections 5 which represents the optimum area for operating the
forceps. The ribbed area, of course, facilitates handling of the
forceps. The pivot point at the innermost ends of strengthening
ribs 7 is formed when these innermost ends are moved into
engagement prior to or simultaneously with the engagement of the
article-engaging teeth 6 to limit the degree of pivot and to
provide a point to permit the teeth to mesh completely as pressure
is being applied to the arms. The innermost ends of ribs 7 may be
provided with projections to assure that these come together at the
same time the outermost teeth engage. The forceps are incapable of
being broken by normal finger pressure.
The forceps are molded in accordance with normal molding techniques
from a suitable plastic material that can be sterilized such as,
for example, glass-filled nylon, and the forceps is molded as
illustrated in FIGS. 1 and 2 with the straight sections and
article-engaging teeth being disposed substantially parallel with
respect to each other which is a normally inoperative position and
the forceps are now ready to be operated.
It will, therefore, be appreciated that the afore-mentioned and
other desirable objects have been achieved; however, it should be
emphasized that the particular embodiment of the invention, which
is shown and described herein, is intended as merely illustrative
and not as restrictive of the invention.
* * * * *