US1284060A - Tweezers. - Google Patents

Description

C. CULMAN.

TWEEZERS.

APPLICATION FILED FEB 10. 1911.

Patented Nov. 5, 1918.

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CARL CUJLMAN, OF ST. LOUIS, MISSOURI,

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Application filed February 10, 1917.

embodied a rather complicated and enpensive organization of structural elements but, in operation, the act of closing the tweezery, jaws on the object, has involved a bodily longitudinal movement of the said jaws,

tending to lift them away from the object, which condition seriously interferes with and renders exceedingly difficult, the grasping' of minute objects by the tweezers.

The present invention has among its objects, therefore, to provide comparatively simple, inexpensive tweezers wherein the jaws in closing will, in so far as bodily longitudinal movement is concerned, remain stationary, thereby insuring ready engagement of the tweezers with the object to be grasped.

With the above and other objects in view, the invention comprises the novel features of construction and combination of parts more fully hereinafter described.

In the accompanying drawings,

Figure l is a side elevation of an instrument embodying the invention; v

Fig. 2 is a central longitudinal section taken on the line 22, of Fig. 1;

Fig. 3 is a detail section taken on the line 33, of Fig. 2, and showing the parts on an enlarged scale v Fig. d is a perspective view illustrating the manner of grasping the instrument in the operation of closing the tweezer jaws;

Fig. 5 is a detail perspective view showing another embodiment of the bearing head applied to the tweezer jaws; and,

Fig. 6 is a similar view showing still another embodiment of the bearing head.

Referring to the drawing, 1 designates an. elongated tubular sheath or casing, equipped with end caps 2 and 3 and provided with a longitudinal slot 4, there being mounted on, and for sliding movement longitudinally of, said casing, a spring sleeve or collar 5 fixed specification of Letters Patent.

Serial No. 14:7,9tt6.

by means of a pin 6 to the head 7 of a pair of cooperating spring tweezer jaws. 8, adapt ed to be normally housed within the casing 1, while provided in the forward end cap 3 1s a slot or opening 9 through which the twee3zer-jaws may be projected forwardly beyond the casing, as shown and as will be Patented not; a, rare.

readily understood. During the movement l of the sleeve 5 on the casing l, in the operation of projecting or retracting the tweczer.

jaws, the pin 6 will travel in the slot 4i and guide the sleeve and tweezers in their movement. The tweezers are made from a length of sheet metal folded upon itself, to provide the pair of jaws 8 which, when projected beyond the casing, are adapted to open an tomatically through their inherent spring action, while for closing the jaws, there is provided, av pair of bearing fingers l0 preferably struck from the body of the casing l at the forward end thereof, and turned inwardly at right angles to the axis of said casing in position to bear on the other side faces of the jaws, as seen more clearly in Fig. 3-, for pressing the jaws to closed position, as the casing moves forwardly over the jaws.

lfn practice, the tweezer jaws are normally housed within the casing and may be projected therebeyond and to open position, by sliding the collar the tweezers proper thus projected beyond the casing, the instrument will be grasped, as in i, and the open jaws positioned for their forward ends to straddle the object to be grasped, whereupon pressure applied by the finger of the operator upon the rear or upper end of the casing, serves to move the 5 forwardly/ along the cas ing to the position shown in Fig. l. Fli'ith casing bodily downward on the jaws, which,

during this operation, remain fixed against relative bodily movement and, therefore, partake of only such movement as will cause them to close upon and grasp the object, this closing movement of the jaws being caused by the bearings 10 riding downward over the outer side faces of the jaws, as will be readily understood. ft is to be particularly noted that the construction embodying my invention dispenses with the use of a springer springs for retracting the tweezers into the casing, and that the, opening and closing movements of the jaws are aflected wholly through a positive manual movement of the casing and tweezers relatively. it will be noted further that the resultant device inltltl lltlti be inexpensively made,

vat their rear meeting en vol Yes a minimum of structural parts, which are of simplified form and may, therefore, and furthermore, that in the operation of the device, when the tweezers are projected beyond the casing, they remain passive while being positioned over the object to be grasped, as above explained, and during the movement of the casing downward thereon for causing them to close upon the object. As a result, the jaws may be allowed to open to their fullest extent, even when the object to be grasped is of minute size, and will under such conditions, close properly on the object without being lifted away therefrom during their closing movement.

In Fig. 5 the tweezer jaws 8 are provided ds with a head 11 molded thereon and of a form (and of suitable size) to fit within the casing 1, and form a bearing for guiding the parts during relative movement of the casing and jaws. 'llhis head may be molded to fit special or odd shaped casings.

In Fig. 6 there is applied around the head 7 of the jaws 8, a bearing-piece 12, adapted to engage the inner face of the casing 1 at diametrically opposite points at right angles to the slot 4, and to cooperate with the pin 6 for guiding the parts during movement of the tweezers into and out of the casing.

From the foregoing, it is apparent that the device accomplishes the stated objects of the invention, it being understood that in attaining these ends, various minor changes may be made in the details herein set forth without departing from the spirit or scope of the invention.

Having thus is claimed is:

1. An instrument of the type described, comprising a pair of cooperating spring tweezer jaws, a casing constructed and arranged to normally house said jaws, and for relative movement longitudinally thereof, said jaws and casing being adapted for posidescribed the invention, what tive, manual movement relatively to project the jaws beyond, or retract them into, the casing, said casing provided with a longitudinally extending guiding slot, means mounted in said slot and supporting said tweezer jaws, and means acting through relative movement of said last-mentioned means and the casing to move the jaws to,

closed position.

2. An instrument of the type described, comprising a pair of cooperating spring tweezer jaws, a casing constructed and arranged to normally house said jaws, and for relative movement longitudinally thereof, said jaws and easing being adapted for positive, manual movement relatively to project the jaws beyond, or retract them into, the casing, said casing being provided with a longitudinally extending guiding slot, a collar mounted on the casing, a pin carried by the collar and extending through said slot, said tweezer jaws being suspended from and supported by said pin, and means acting through relative movement of said sleeve and casing to move the jaws to closed position.

' 3. An instrument of the type described, comprising a pair of cooperating spring tweezer jaws, a casing eonstrueted and arranged to normally house said jaws, and for relative movement longitudinally thereof, said jaws and easing being adapted for positive, manual movement relatively to project the jaws beyond, or retract them into, the casing, said casing being provided with i longitudinally extending guiding slot, :1; collar mounted on the casing, a pin carried by the collar and extending through said slot, said tweezer jaws being suspended from and supported by said pin, said casing having inturned bearing fingers at its lower end disposed to act upon the outer faces of said jaws and move said jaws to closed position.

In testimony whereof I aiiix my signature this 18th day of November, 1916.

CARL CULMAN.

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