US2412255A - Tweezers - Google Patents

Description

Dec. 10, 1946. i G, M FERGUSON 2,412,255

VTwEEzERs Filed Oct. 20, l1944 Patented Dec. 1o, 1946 UNITED STATES PATENT ori-ICE TWEEZERS George M. Ferguson, Portland, Oreg.

Application October 20, 1944, Serial No. 559,565 a claims. (c1. :s1-4s)` This invention relates generally to tweezers, and particularly to a pair of tweezers of the pincers type.

The main object of this invention is to pro-4 vide an inexpensive and efficient form of tweezer in which the points will be held in alignmentand prevented from opening under excessive pressures.

The second object is to construct a pair of tweezers of the class described which Will be easy to manufacture, convenient to hold in the hand, and not easily rendered inoperative.

These and other objects Will beco-me more apparent in the specification as illustrated in the accompanying drawing, in which Fig. 1 is a plan of the device.

Fig. 2 is a side elevation.

Fig. 3 is an enlarged side elevation showing the pivot end of the device.

Fig. 4 is a view similar to Fig. 3, bu-t showing the side disc removed.

Fig. 5 is a transverse section taken along the line 5-5 in Fig. 3.

Fig. 6 is a fragmentary plan of the pivot end of one of the tweezer blades.

I2 when a considerable amount of pressure is' applied to the device. Obviously, the members I0 should be made of a high grade tempered commonly joined by riveting or welding, I prefer, in this instance, to unite them by means of a novel construction which will provide the utmost flexibility for the arms I0, accuracy of alignment and ease of manufacture.

I accomplish this by forming on the ends I3, the pivot points I4, which may be square or rounded as desired. The portions I3 of the arms I0 are preferably straight, as illustrated, and are held in spaced relationship by the resilient cylindrical member I5 provided with slots I6, which receive the ends I3 and have a central hole I 'I adapted to receive a rivet I8, whose reduced ends I9 extend beyond the ends of the member I5. At each end of the member I5 is placed a side disc 20, provided with a counter sunk opening :2| at the center thereof. and the f I4 0f the I 8 are inserted in the resilient member 20, which is preferably made of rubber or itseequivalent, and thediscs 20 are put into place and riveted and the device is ready for use. It will be noted that when pressure is applied to urge the points I2 together, it compresses the material 23 of the bushing I5 between the portions I3 and stretches the material of the members I5 on the opposite side of the rivet I 8. The exact position of the pivots I4 with relation to the center line of the rivet I8 will be determined by the resiliency of the member I5, the strength of the members IIJ and the character of the service for which the device is intended.

It can be seen from the foregoing that while l there is provided an ideal pivotal condition, there is also obtained the very desirable result of having the points I2 held in perfect register by means of the side discs 20, which arein close contact with the side edges 24 of the members I3.

While I have referred to the member I5 as resilient and it is preferable that it should be so, it will be apparent that it could be of hard rubber or metal, inwhich case reliance is placed upon the members I0 for resiliency without departing from the spirit of this invention.

While I have thus illustrated and described my invention, it is not my desire to be limited to the precise form shown herein, and I intend to cover ysuch forms and modifications of the invention as fall fairly within the appended claims.

I claim:

1. In a device of the class described, a combination of a cylindrical rubber insert having a pair of parallel longitudinal slots formed in one side thereof on opposite sides of its center, a tweezer arm occupying each of said slots and having outwardly extending pivot pins between the arm ends projecting beyond the endmost limits of the rubber insert, a disc disposed at each end. of said insert having openings therein for the reception of said pivots, and a rivet passing j through said discs and through said insert- 2. The device as described in claim 1, characterized by having said discs and insert of the same diameter, said diameter exceeding the outermost spacing of the adjacent ends of said tweezer arms.

3. A device of the class described, consisting of a pair of spaced discs, a cylindrical rubber insert disposed between said discs, said insert having parallel slots formed therein opening on the same side of said insert, tweezer arms having their ends occupying said slots and having pivots projecting therefrom between the arm ends anchoring in said discs and a rivet extending.r

through said discs and rubber insert adapted to hold said discs against the sidesof said tweezer arms.

GEORGE M. FERGUSON.

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