US2875651A

US2875651A - Electrician's tool

Info

Publication number: US2875651A
Application number: US699111A
Authority: US
Inventors: Arthur Y Kissinger; William S Snyder
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-11-26
Filing date: 1957-11-26
Publication date: 1959-03-03
Anticipated expiration: 1976-03-03

Description

FIG. 1..

March 3,

FIG.6.

A. Y. KISSINGER ET AL ELECTRICIAN S TOOL Filed Nov. 26, 1957 I INVENTORS ARTHUR Y KISSIN GER WILLIAM S. SNYDER ATTORNEY United States Patent 2,875,651 ELECTRICIANS TOOL Arthur Y. Kissinger and William S. Snyder, Lancaster, Pa. Application November 26, 1957, Serial No. 699,111 1 Claim. (Cl. 77-73) This invention relates to a tool particularly adapted for use by electricians during the installation of wiring, conduits and the like.

The cutting of metal conduits in lengths to form the particular installation either by a saw or a shear leaves burrs about the cut edges which must be removed to avoid damaging the insulation on wires when they are pulled through the conduit, and also to remove the hazard of injury caused by said burrs to the installers hands.

Accordingly, an object of the invention is to provide a reamer device having a lead end or guide end which will readily and easily remove the burrs from the cut edges of conduits of the range of diameter usually used and enable the installer to easily and quickly perform his work in a manner which is safe to himself and safe from the standpoint of eliminating the possibility of injury to the wiring.

Another object of the invention is to provide a device in the nature of a reamer which may be made in a form to be held to a handle by a shaft or stem, and which includes a one-piece cone having an external reaming surface, or alternatively, the cone may be split longitudinally and provided with threads for receiving an anchoring stud in the handle and also a lead or guide rod which may, if desired, be formed at its extremity opposite the handle as a screwdriver.

A further object of the invention is to provide a reamer which may be made in sections so that it may be readily adapted and applied to the shank of tools such as screwdrivers already in use.

With the above and other objects in view, the invention consists in the construction and combination of parts hereinafter more fully described, illustrated and claimed.

In the accompanying drawings:

Figure 1 is a partial longitudinal sectional view illustrating the reamer applied to the shank of a lead or guide rod carried by the handle.

Figure 2 is a perspective view of the one-piece reamer shown in Figure 1.

Figure 3 is an exploded perspective view illustrating a modified form of cone and showing how it may be assembled in relation to the lead or guide rod and the handle.

Figure 4 is a partial sectional view of the parts of Figure 3 assembled.

Figure 5 is an exploded perspective view of a twopart cone type reamer which may be applied to any exist ing tool having a shank or stem.

Figure 6 is a more or less diagrammatic view illustrating the range of application of the invention of conduits of different diameters.

Similar reference numerals designate corresponding parts throughout the several figures of the drawings.

The reamer is designated generally as A, and as shown in Figures 1 and 2 is of substantially conical formation,

having an external cutting face 1 and a central opening or bore 2 which is preferably tapered to receive the shank 2 3 of a guide rod or stem which may be anchored as at 4 in the handle H.

In the embodiment shown in Figures 1 and 2, it will be understood that the reamer A is assembled with the handle in the form of a tool by driving the shank 3 of the guide rod or stem into the tapered bore 2 and into the handle so that the portion of the guide rod or stem projecting forwardly of the tip of the cone will enable the user to readily thread or insert the tool in the conduit, designated generally as C. In many cases conduits are installed under poor lighting conditions and in places difiicult to reach. Therefore, for the reamer A to be conventionally and effectively used it is desirable that the rod or stem project beyond the lead end of the reamer so as to easily guide the tool in operative position. As previously indicated, the forward end. of the stem may be formed as at S for use as a screwdriver.

Referring to Figure 3, it will be seen that the reamer is provided with sockets separated as at 2. These sockets are internally threaded as indicated at 6 and 7, re spectively, to receive a mating threaded portion 8 of the stem 3 and the related threaded portion 9 of the stud 10 embedded in the handle. The body of the reamer is provided with transverse openings at the location of the socket to receive the fastenings 11 which pass through openings 8* and 9 respectively to lock the reamer tothe lead rod or stem 3 and the stud 9.

Referring to Figure 5, it will be seen that the reamer may be made in longitudinally split sections A and A eachhaving complementary non-threaded axial channel 12, which would enable the two halves to be clamped or otherwise secured together on any existing tool having a shank or stem, thereby materially increasing the range of the invention and making it applicable to tools now in use, as well as those manufactured initially in final form.

While the reamer is shown as having a conical cutting surface, it will be understood that an equivalent surface, such for example as a convex surface will perform as required. The essential feature is that the reamer be smaller at its lead end than at its trailing end.

Also the lead or guide stem may be of any desired length. For example, it may be short for use in places where the cut in the pipe is near an elbow or it may be longer for straight unbent pipe.

Figure 6 illustrates a series of conduits of different diameter to show how the reamer A may be used with conduits ranging from to 1%". Thus, the tool adequately performs in the normal range of application of conduit installation.

We claim:

As an article of manufacture, an electricians tool for use in installing conduit pipe of different diameters to remove burrs from cut entrance edges of the pipe, comprising, in combination, a handle having a circular tapered stem-receiving socket, a circular tapered stem therefor, and a conical reamer provided with a tapered axial circular bore having the wide end of the taper at the apex of the cone, said circular bore snugly receiving said stem and securing the cone to the handle and the diameter of the apex and base of the reamer covering the minimum, intermediate and maximum pipe diameters with which the tool is used.

References Cited in the file of this patent UNITED STATES PATENTS 63,822 Young Apr. 16, 1867 358,731 Clark Mar. 1, 1887 1,083,747 Kocher Ian. 6, 1914 2,094,432 Pazzano Sept. 28, 1937 2,792,728 Novosel May 21, 1957