US2645956A - Wire pulling tool - Google Patents

Description

u 1953 R. F. BLACK, JR., ET AL 2,645,956

WIRE PULLING TOOL Filed Jan. 7, 1950 FIG. I

ATTYS Patented July. 21, 1953,

UNITED STATES PATENT OFFICE WIRE PULLING 'rooL Robert F. Black, Jr., and Bernard T. Lapsley,

Dorchester, Mass.

Application January 7, 1950, Serial No. 137,448

1 Claim. (Cl. 813) 1 a The object of this invention is the provision of a tool for use in connection with wiring houses, buildings and the like, and it is intended to provide a convenient, strong tool which will do the work of pulling or drawing a wire against the friction of curves, corners or obstructions so frequently encountered in such work. At present, there has been devised, to our knowledge, no small, handy, hand tool which will grasp the snake wire firmly and permit the application of manual strength in a manner to provide efiiciency. As is well known, the snake Wire is commonly drawn through the channel provided by the use of pliers or similar tool fundamentally provided for other purposes. By the use of the device illustrated and described herein, a wire may be seized by a gripping action which binds the wire more firmly as the pulling resistance is increased; and, the greater the resistance to the pull, the stronger is the gripping action. It is designed to be strong, yet light, and it may be provided with other devices as here shown and described without derogating from the primary use of the device.

The manner in which it is constructed and is to be used is hereinafter set forth and described in the drawing, in which- Figure 1 is a view of the bifurcated handles in close position;

Figure 2 is a view of the opposite side of the closed tool;

Figure 3 is a view of the knurled wheels grasping a wire; and

Figure 4 is a view of the tool in pinching action on a wire at the ends of the tool.

Handles I0 and I2 are releasably connected by a latch and hook, connection l4 and [6, The two handles are connected by ahinge bar connection IE to which they are pivoted by bolts 20 and 22 and nuts 24 and 26, the nuts being so attached as to permit the rotation of thebolts 20 and 22 in the holes provided in the handle ends, whereby the handles when unlatched may be placed in substantially end-toend position.

When the spring latch52 is released by the user, the handles may be pulled outwardly and the free ends separated, as shown in Figure 4,

the ends 28 and 30 passing by each other by,

means of the triangular notches 32 and 34 cut into the opposing end faces 36 and 33 of the handles.

When the handles are thus separated from each other and are drawn into end-to-end position, a space is thus provided between the opposing end faces 36 and 38. In operation, to pull a snake wire A or other wire, the outer corners of the faces 36 and 38 are clamped on the wire and force is directed on the handles in a downward direction, as in Figure 4, which thus plied to grip and clamp the wire A to pull it without the tendency to permit the jaws to slip, as is the case when wire is pulled by the jaws of a plier or similar tool. The greater the resistance to the pulling force, the tighter is the clamping action.

In another aspectof the use of the invention, two knurled or milled wheels 40 and 42 are used. The wheel 40 is fixed by a screw 44 to the handle I2 and is non-rotatable. It serves as a fixed abutment to support the thrust of the other wheel on an interposed wire. The wheel '42 is rotatably attached to the handle II) by a pivot bolt 46 eccentrically located with respect to the circumference of the wheel. For wire pull.- ing, the wire A is placed into the spaces between the knurled wheels, and the eccentric wheel will, upon application of pressure, act to jam and clamp the wire, thereby permitting the user to exert pulling power in a direction parallel to the axis of ,the handles which are retained in locked position by the latch, lock and spring. The lock 48 is held rigidlyin place by a bolt 50, and the latch 52 is held rotatably in place by the screw 54 and is held in a locked position by the spring 56 attached to a screw 58, excessive. movement being'prevented by stop pins tn and BI. The handles Ill and 12 are held in locked position and alignment by the dowel or stud 62 placed in the hole 64, thereby locating the knurled wheels 40 and 42 directly opposite each I other.

We claim: A wire pulling tool comprising two bars L adapted to be in parallel edge-to-edge engagement, 2. link pivotally attached to both of said bars at one end thereof, latch means on said bars spaced from said link releasably holding saidbars in side-by-side engagement, and gripping means mounted on said bars between said link and said latch means, said gripping means consisting of an abutment member on one of said bars and a circular disk eccentrically-rotatable on the other bar andadjacent to said abutment member.

ROBERT F. BLACK, JR. BERNARD T. LAPSLEY.

References Cited in the file of this patent UNITED STATES PATENTS Patterson Dec. 12, 1933

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