US1019835A - Tool for removing insulation from wires. - Google Patents

Description

H. PRAGK. TOOL FOR REMOVING INSULATION FROM wmns.

APPLICATION IILED AUG.26, 19il1.

Patented Mar. 12, 1912.

COLUMBIA FLANOGRAPH co., WASHINGTON. D c.

HENRY PRACK, OF OTTAWA, ILLINOIS.

TOOL FOR REMOVING INSULATION FROM WIRES.

Specification of Letters Patent.

Patented Mar. 12, 1912.

Application filed August 26, 1911. Serial No. 646,257.

To all whom it may concern:

Be it known that I, HENRY PRACK, a citizen of the United States, residing at 515 Vest Superior street, city of Ottawa, county from wires.

The object of my invention is the production of a tool of the character mentioned which will be of durable and economical construction and of high efliciency in use.

Other objects will appear hereinafter.

\Vith these objects in view, my invention consists in a stripping tool characterized as above mentioned and in certain details of construction and arrangements of parts, all as will be hereinafter more fully described and particularly pointed out in the appended claims.

My invention will be best understood by reference to the accompanying drawing forming a part of this specification and in which,

Figure 1 is a perspective view of a wire stripping tool embodying my invention, F ig. 2 is a slightly enlarged transverse section taken through the jaws of the tool with said jaws in closed or operative position.

The preferred form of my construction as illustrated in the drawing comprises a pair of levers 1 which are pivotally connected at 2. The longer ends of said levers 1 are designed to constitute handles, the opposite ends thereof being formed with registering similar jaws 3 which are formed integral with said levers. Each of the jaws 3 comprises parallel transversely extending side bars 4. The inner sides of the bars 4 at the inner edges thereof are beveled, as clearly shown in Fig. 2, to serve as a means of centering the wire being stripped between the jaws 3, the beveled inner sides of said lateral bars engaging the opposite sides of the wire holding the latter central. Provided centrally between the bars 4 is a similar knife edged bar 5 which is disposed parallel with the bars 4, the knife edge of the bar 5 being disposed, as clearly shown in Fig. 2, slightly below the plane of the knife edges of the bars 4. Corresponding ends of the bars 1 and 5 are connected by semi-circular plates (3 which are formed integral therewith, the inner or straight edges of said plates being also sharpened so as to constitute the same cutting edges. The cutting edges of said plates 6 are provided centrally with semicircular recesses 7, the recesses 7 in corresponding plates of the respective jaws 3 bemg positioned for registration so that when said jaws are closed said recesses together will form a circular openin The plates 6 are so positioned relative to the recesses 7 that the cutting edges of the former register with the bottoms of said rece ses, as clearly shown in Fig.

In using a tool constructed as above set forth, the wire to be stripped is first arranged between the jaws 3 to extend longitudinally of the latter so that said jaws will contact with the particular portion of the wire from which it is desired to remove the insulation. \Vhcn so positioned the bandles of the levers l are pressed together causing the forcing of the jaws into engagement with the covering or insulation of the wire. In this operation the cutting edges of the plates (3 and of the bars 5 pierce the insulation, the former severing the same transversely and the latter longitudinally, so that when the tool is rotated slightly the insulation gripped thereby will be loosened from the wire and removed by the jaws 3 when the same are opened. The provision of the recesses 7 affords clearance for the wire which is positioned axially within the insulating covering so that when the jaws 3 are forced into engagement with the insulation covering, the wire positioned therein will not be severed. By arranging the cutting bars 5 with their cutting edges positioned as stated the latter, when the jaws 3 are forced together, will pierce the wire insulation extending through the same into close proximity with the axial wire, not to such an extent as to pierce the wire. The arrangement of the bars 1 and 5 affords openings or interstices between the same, such openings or interstices permitting of ready cleaning of the jaws after use. Such construction is of great advantage, since wires not infrequently are covered with pitch or a semi-fluid insulation which when the jaws of a tool are forced into engagement therewith, adheres thereto with great tenacity. stated any pitch or other substance which might adhere thereto may be readily dislodged and the jaws thus readily maintained in proper condition for use.

A stripping tool of the construction set fort-h is durable and economical and the same is of high efliciency-in operation.

lVhile I have illustrated and described the preferred form of construction for carrying my invention into effect, the same is capable of variation and modification without de parting from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but wish to avail myself of such variations and modifications as fall within the scope of the appended claims.

Having described my invention, What I clainras new and desire to secure by Letters Patent, is:

1.- In a tool for removing insulation from wires, a pair of pivotally connected jaws, each of said jaws comprising two parallel side bars having beveled inner edges; a central knife edged bar disposed parallel with said side bars and having its cutting edge disposed below the corresponding edges of said side bars; and end plates connecting said bars and having recesses provided centrally in the inner edges thereof, substan tially as described.

2. In a tool for removing insulation from wires, a pair of pivotally connected jaws, each of said jaws comprising two parallel side bars having beveled inner edges; a central longitudinal knife edged bar disposed parallel with said side bars and having its cutting edge disposed below the corresponding edges of said side bars; and end plates connecting said bars, said end plates having knife edged inner edges having recesses provided centrally therein, said bars and plates By constructing the jaws as.

being formed integral, substantially as described.

3. In a tool for removing insulation from wires, a pair of pivotally connected jaws, each of said jaws comprising two parallel side bars the inner sides of said bars at the inner edges thereof being beveled, a central longitudinal knife edged bar disposed parallel with said side bars and having its cut ting edge disposed below the corresponding edges of said side bars; and substantially semi-circular end plates connecting corresponding ends of said bars, the inner edges of said end plates being sharpened, and provided with semi-circular recesses, the cutting edges of said medial bar being in registration with the bottoms of said recesses, there being interstices between said bars, substantially as described.

4. In a tool for removing insulation from wires, a pair of pivotally connected levers; registering jaws carried at corresponding ends of said levers, each of said jaws comprising two parallel side bars the inner sides of said bars at the inner edges thereof being beveled; a central knife edged bar disposed parallel with said side bars and having its corresponding edge disposed below the cutting edges of said side bars; and substantially semi-circular end plates connecting corresponding ends of said bars, the inner edges of said end plates being sharpened and provided centrally with semi-circular recesses, the cutting edges of said medial bar being in registration with the bottoms of said recesses, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY PRACK.

Witnesses:

THERESA J. BUTLER, NELLIE KELLY.

Copies of this patent may be obtained for five cents each, by addressing; the Commissioner of Patents, Washington, D. G.

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