A means and method for forming tweezers and tweezers handles out of a single piece of material. The tweezers consist of unitary body including two parallel spaced apart arms which extend from an integrally formed heel end portion The ends of the arms opposite the heel end portion comprise tweezer tips or can be connected to replaceable tweezer tips. In a preferred embodiment, the single piece tweezers are produced by electrical discharge machine process which produces very accurate and precise cuts.

BACKGROUND OF THE INVENTION 
a. Field of the Invention 
This invention relates to a tweezers, and in particular, a means and method 
for producing a single-piece tweezers and tweezers handles. 
b. Problems in the Art 
Conventional tweezers require tweezers or gripping tips which accurately 
and correspondingly come together upon convergence of the tweezers 
handles, and which also can securely hold even the smallest of objects. 
Such preciseness, accuracy and reliable gripping capacity is especially 
important in tweezers used for such purposes as surgery. 
Manufacturing of accurate and reliable tweezers involves significant 
expense. Conventional tweezers have parallel elongated gripping arms which 
are separately manufactured and then joined at their rearward ends by 
fastening means, some type of joint, or by brazing. For precise 
instruments, welding of the two gripping arms is generally not possible 
because the high temperature would deform or otherwise jeopardize the 
accuracy and shape of the gripping means. 
A particular and substantial problem with conventional metal tweezers made 
of separate pieces is that the joint, connection, or brazing is, of 
necessity, made of a different material than the gripping arms of the 
tweezers. Because tweezers many times are exposed to moisture, it has been 
found that corrosion and rust resistance is diminished because of the 
presence of different types of metals in contact with one another. 
Rust or corrosion, especially at the joint for the tweezers, could impair 
its operation or its continued use. Therefore, one method to eliminate 
this problem would be to construct the tweezers entirely of one material. 
It is also noted that a significant problem with regard to manufacturing 
costs exists in that conventional two or more piece tweezers handles 
require more manufacturing steps, which means more cost. 
It is therefore a principal object of the present invention to provide 
tweezers which improve over or solve the problems in the art. 
A further object of the present invention is to provide tweezers and 
tweezers handles which are made from a single piece of material. 
Another object of the present invention is to provide tweezers which are 
made from a single type of material. 
Another object of the present invention is to provide tweezers which are 
very resistive to corrosion. 
Another object of the present invention is to provide tweezers which can be 
manufactured to high tolerances, and precise specifications. 
Another object of the present invention is to provide tweezers which can be 
manufactured economically. 
A further object of the present invention is to provide tweezers which are 
accurate, precise, and durable. 
These and other objects, features, and advantages of the present invention 
will become apparent with reference to the accompanying specification and 
drawings. 
SUMMARY OF THE INVENTION 
The present invention utilizes tweezers and tweezers handles made of a 
single piece of material. By manufacturing the tweezers or tweezers 
handles out of one piece of metal material, corrosion is resisted much 
better than tweezers which contain different types of metal material. 
One preferred embodiment of the present invention has a unitary body, 
including two parallel spaced apart gripping arms which extend from a heel 
end portion. No bending or forming of the tweezers is required after 
cutting the tweezers from the single piece of material, other than 
possibly bending the arms slightly outward so that they are biased to an 
open position. A second preferred embodiment has a unitary, single-piece 
tweezers handle made of two spaced apart handle members extending from a 
heel end portion. Replaceable gripping tips made from the same material as 
the handle comprise the working end of the tweezers. The terms 
"single-piece tweezers" is to be understood to cover both types of 
embodiments. 
A preferred method for producing the single piece tweezers or tweezers 
handles involves the use of electrical discharge machine (EDM) process. In 
particular, a traveling wire electrical discharge machine can be used to 
cut the tweezers out of metal material with extremely high precision. EDM 
also requires little post-cutting finishing. This allows the economical 
production of very precise or small instruments, such as those used in 
surgery or microsurgery.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
With reference to the drawings, and particularly FIG. 1, there is shown a 
single-piece tweezers 10 according to the present invention. It is again 
pointed out that "single-piece tweezers" refers to both embodiments such 
as is shown in FIGS. 1, 3 and 4 as well as that shown in FIGS. 2, 5 and 6. 
The entire tweezers can be literally made from a single-piece (FIGS. 1, 3 
and 4) or just the handle portion (FIGS. 2, 5 and 6). Tweezers 10 includes 
parallel spaced-apart arms 12 and 14 which extend from a heel portion 16. 
The entire tweezers 10 is made from a single piece of material. In the 
preferred embodiment of FIG. 1, the material can be stainless steel. Arms 
12 and 14 are slightly sprung so that they are biased in a normally open 
position ready for use. Tip sections 18 and 20 are part of the unitary 
body of tweezers 10 and are of corresponding shape to one another. 
Protrusions 22 are integral with the outer body of tweezers 10 and enhance 
gripability of handles 12 and 14. Stop members 24 and 26 extend generally 
perpendicular from the innerfacing surfaces of arms 12 and 14, and are 
aligned to come into abutment when handles 12 and 14 are converged towards 
one another. The height of stop members 24 and 26 can be accurately 
manufactured so that they come into abutment and stop further convergence 
of arms 12 and 14 so that the very ends of tip sections 18 and 20 also 
come into abutment, but that no bending or deforming of the tip sections 
18 and 20 takes place which might cause sections 18 and 20 to gap. As can 
be seen in FIG. 3, tip sections 18 and 20 are manufactured so that a gap 
28 exists between them even though outer tip ends 30 and 32 are in 
abutment. Stop members 24 and 26 stop any movement which might deform tip 
sections 18 and 20 and experience the majority of any force trying to 
further converge arms 12 and 14 together. 
FIGS. 3 and 4 also better show the specific shape of the embodiment of FIG. 
1 with its precise features. 
FIG. 2 depicts a second embodiment of tweezers 34 which are essentially the 
same as tweezers 10 except that arms 36 and 38 are shorter. Additionally, 
tip sections 40 and 42 are removable from arms 36 and 38 by virtue of key 
members 44 and 46 which matably fit within slot members 48 and 50. Tip 
sections 40 and 42 are therefore interchangeable with the unitary, 
single-piece body of tweezers 34 so that if they are damaged or need 
service, this can easily be accomplished. In the preferred embodiment, key 
members 34 and 46 are secured by interference fit into slots 40 and 50. 
That is, the diameter of key members 44 and 46 is slightly larger than 
slots 48 and 50. It is to be understood, however, that tip sections 40 and 
42 will still be made out of the same type of metal as arms 36 and 38 so 
that corrosion will continue to be resisted. 
FIGS. 5 and 6 show with more detail the specific features of tweezers 34. 
FIG. 7 shows, in further enlarged detail, one embodiment of the precise 
outer tip ends 30 and 32 of tweezers 10. Outer tip ends 30 and 32 are 
basically L-shaped in configuration but have minute features including 
tooth 52 extending from outer tip section 30 and teeth 54, 56, and V-slot 
58 on outer tip end 32. Also, there are raised edges 60 and 62 inward 
along outer tip ends 30 and 32. 
The preferred method for creating single-piece tweezers such as described 
above is by use of traveling wire electrical discharge (EDM) machines 
which allow the precise, accurate, and economical cutting of instruments 
from any electrical conducting material such as stainless steel, for 
example. Traveling wire electrical discharge machine process is known in 
the art and machinery and controlling mechanisms to perform these 
functions are available from various companies including Charmilles 
Corporation of America, 58 Enter Lane, Hauppauge, N.Y. 11787. 
Producing items such single-piece tweezers provides the advantages above 
discussed and also reduces the cost of production. Electrical discharge 
machines (EDM machines) present a desirable method for making tweezers 
according to the present invention because of the ability for extreme 
precision for many types of cuts. Precision can be made within 1/10,000ths 
of an inch to allow the intricate detail such as shown in FIG. 7. All that 
is required to finish implements such as the tweezers is some polishing, 
which is vastly less than is required to finish items made by other 
conventional methods. 
It is to be noted that arms 12 and 14 of single-piece tweezers 10 of FIGS. 
1, 3 and 4 can be manufactured so that they taper from being thin at or 
near heel 16 and then become increasingly thicker towards tip sections 18 
an 20. This is particularly depicted in FIG. 3. Such tapering is 
beneficial as it increases torsional stability of tweezers 10, which is 
critical for long-armed tweezers. This can be compared to the alternative 
embodiment of tweezers 34 in FIG. 5. Additionally such precise tapering is 
easily accomplished by the EDM process and machines. 
It is to be understood, however, that other methods could be used to 
produce single-piece tweezers according to the present invention. 
It is to be understood that the included preferred embodiment is given by 
way of example only, and not by way of limitation to the invention, which 
is solely described in the claims herein. Variations obvious to one 
skilled in the art will be included within the invention defined by the 
claims.