US2767468A

US2767468A - Shearing type cutting tool

Info

Publication number: US2767468A
Application number: US363950A
Authority: US
Inventors: Seymour J Rogal
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-06-24
Filing date: 1953-06-24
Publication date: 1956-10-23
Anticipated expiration: 1973-10-23

Description

Oct. 23, 1956 s. J. ROGAL SHEARING TYPE CUTTING TOOL 2 Sheets-Sheet 1 Filed June 24, 1953 J J V ATTORNEYS Oct. 23, 1956 5. J. ROGAL 2,767,468

SHEARING TYPE CUTTING TOOL Filed June 24, 1953 2 Sheets-Sheet 2 INVENTOR s. ROGAL ATTORNEYS United. States Patent SHEARING TYPE CUTTING TOOL Seymour J Rogal, New York, N. Y.

Application June 24, 1953', Serial No. 363,950

2 Claims. (Cl. 30-240) (Granted under Title 35, U. S. Code (1952), sec. 266) The invention described herein may. be manufactured and used by or for the Government of the United States of Americav for governmental purposes without the payment of any royalties thereon or therefor.

The present invention relates to a shearing type cutting tool, and particularly to a hand tool adapted for cutting.

wire orthin rod material.

One of the chief defects of many wire cutters in current use is that their structural design prohibits their being used to cut wire in relatively inaccessible places. This is particularly true of cutters of the jaw type wherein two cutting jaws are pivotally connected and must be spread apart for separation during the cutting operation.

The present device overcomes these, and many other defects. It is advantageous in reaching out-of-the-way places for cutting wires in radio and television sets. It is sufficiently small and light in weight to be readily manipulated by one hand. Its lack of bulk, especially at the cutting end, enables the user to see exactly what is being cut, and also enables him to manipulate the cutting edges in very crowded and inaccessible spaces.

One of the objects of the present invention is to provide a hand operated cutting tool which is small and easy to manipulate.

Another object is to provide a tool which is adapted for cutting wires, insulation, or rods in crowded and relatively inaccessible areas.

Still another object is to offer a light weight cutter with small cutting jaws which will permit easy observation of the cutting operation.

Another object of the invention is to provide a tool which is not bulky at the cutting end and which is rodlike in construction to permit the cutting jaws to be actuated at quite a distance from the cutting edges themselves.

A still further object is to provide a pair of coaxial cutting members, thus eliminating any pivotal connection between the cutting jaws.

Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:

Fig. 1 is a perspective view of the cutting tool forming the present invention,

Fig. 2 is a side elevation of the tool,

Fig. 3 is an enlarged view in side elevation of the cutting end of the tool,

Fig. 4 is an enlarged top view of the cutting end,

Figs. 5, 6 and 7 are cross sectional views taken along the lines 5-5, 6-6, and 7-7, respectively, of Fig. 4,

Fig. 8 is a vertical sectional view through the upper handle portion of the tool, and

Fig. 9 is a sectional View taken along line 99 of Fig. 2.

The cutting tool includes a handle or hand grip portion 1 designed in the form of a pistol grip for ease of handling and operation. Extending forwardly from the handle is a tubular barrel shaped member 8 through which passes a solid cylindrical rod 10. This rod is adaptedfor rotational movement to a limited extent within the barrel 8, and is activated by means of thumb pressure applied to'a handle or ear-like projection 2 extending upwardly from one end of the rod. The rod is cut away at one end to form a recess 17, the recess forming one jaw 9 of a pair of

cutting jaws

9 and 12. Since the barrel 8 is tubular in construction, the jaw portion 9 is capable of' rotation internally thereof, The barrel is cut away at itsfree end as seen in Figs. 3 and 4 to form jaw 12 with astraight cutting edge 20 which lies adjacent and parallel to the straight edge 18 of the jaw 9 as shown in Figs. 4; 5; 6 and 7 and constitutes one edge of plane 22 resulting from cutting down said jaw 12. The bottom portions ofjaws 9 and 12 are rounded'otf as seen at 14 in Figs. 3, 5, 6 and 7, the rounding of two jaws taking place while they are in the relationship of Fig. 4 resulting in small pointed jaw tips which become progressively larger toward the rear portions, as clearly brought out progressively by Figs. 5, 6 and 7. In addition, the barrel is cut away along one side to form a helicoid 32 as seen more clearly in Fig. 4, thus resulting in a small cutting-tip.

Rotation of the rod within the barrel 8 causes the

cutaway ends

9 and 12 of the rod 10 and barrel 8 to rotate relative to each other about the central axis of the shaft 1%. This rotation results in a cutting action between the sharpened

edges

18 and 20. The extreme ends of the

cutting jaws

9 and 12 are rounded as shown at 14 in Figs. 3 through 7. The purpose for this is to enable the user of the cutting tool to wedge the jaws between closely spaced wires, after which jaw 9 is turned in a clockwise direction, as seen in Fig. 9, causing the wires to be spread further apart. The strain on the upper wire, in conjunction with the curvature of the surface 14 of jaw 9 and manipulation of the tool, causes the upper wire to slip off of the front end of jaw 9 and enter the slot 19. Spring 4 is then permitted to return jaw 9 to its Figs. 2, 4 and 9 position, thus leaving the upper wire in the slot 19 and ready to be cut.

The shaft 10 is normally urged to rotate by thumb pressure on handle 2 in a counter-clockwise direction in Fig. l and a clockwise direction in Fig. 9. This rotation causes cutting edges 13 and 20 to snip the wire in two. The

cutting jaws

9 and 12 are retained in their normal open position ready for operation and for reception of a length of wire or spaghetti insulation by means of a pin 6, slot 16 and spring 4.

The pin 6 is designed to limit rotation of the shaft 10 by contact of pin 6 with the ends of the semicircular slot 16 in barrel 8. Spring 4 surrounds shaft or rod 10 with one end 3 extending upwardly into slot 11 of the handle 1 and the other end 5 projecting into a hole in the rod. This spring tends to rotate the rod 10 in a counter-clockwise direction in Fig. 9, so that the pin 6 will move downwardly in slot 16 when the handle 2 is released to return the cutting jaws to their open position.

in assembling the device prior to use, the spring 4 is first slid onto rod 10 until end S snaps into the rod opening. Then the sleeve 8 is slid on over rod 10 until it abuts spring 4. Pin 6 is then driven into the rod 10 through the slot 16. This retains

parts

4, 8 and 10 in an assembled relation. This assembly is then pushed through the cylindrical opening in the top of handle or grip 1, the

ends

9 and 12 being inserted first into the rear of the opening. Slot 11 permits the upturned end 3 of spring 4 to move easily into place. When the parts are in the Fig. 8 position, the set screw 7 is tightened to retain the assembly in the handle 1. The device is then ready for use.

One of the advantages of the present invention is the fact that the entire device is a simply constructed unit of few parts, yet capable of many uses. The pistol-like shape enables the user to pin-point the cutting jaws with great accuracy at considerable distances from his hand.

Also, the rigidity of the rod and tube construction with no pivoting jaws or links permits the tube and rod to be made in various lengths. Furthermore, the ease of assembly' allows ready replacement of any worn or broken parts and makes renewal of worn or broken cutting jaws a simple operation. In addition, parts are readily removable for sharpening of

edges

18 and 20.

Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

What is claimed is:

1. A device for cutting wire comprising a pistol shaped hand tool, said tool having a hand grip with a tubular upper portion, a tubular barrel within and extending forwardly from said tubular upper portion, a cutting jaw at the forward end of the barrel, a rod rotatably mounted in the barrel, a cutting jaw at the forward end of the rod for cooperative wire cutting movement relative to the first cutting jaw, a pin and slot stop means located within and shielded by the tubular upper portion of the grip to limit rotation of the rod within the barrel, spring means within said tubular upper portion constantly urging the pin against one end of the slot to retain the cutting jaws in open relation, and a projection at the rear end of the rod for rotating the rod against the action of the spring to move the cutting jaws toward each other.

2. A cutting tool comprising a tubular member, a re cessed extension on said tubular member forming a jaw member, said extension having a helicoidally out front edge to provide said jaw member with a small cutting tip, a rod extending through said tubular member, a cutting jaw extending from said rod and spaced from said jaw member, means secured to said rod for rotation thereof, and spring means engaging said rotation means for maintaining said cutting jaw in spaced relation with respect to said jaw member when in inoperative position, said jaws being rounded and becoming progressively larger toward the rear portions thereof.

References Cited in the file of this patent UNITED STATES PATENTS 1,520,529 Cagle Dec. 23, 1924 1,663,761 Johnson Mar. 27, 1928 1,860,409 Flink May 31, 1932 2,387,633 Alpert Oct. 23, 1945 FOREIGN PATENTS 847,770 France July 10, 1939