US2712851A - Heavy duty metal parting apparatus - Google Patents

Description

July 12, 1955 G. L. CARTER ETAL HEAVY DUTY METAL PARTING APPARATUS 2 Sheets-Sheet 1 Filed April 11, 1952 A m/ fi 12% 7 45 Pa 05 @AM July 12, 1955 G. L. CARTER ET AL 2,712,851

HEAVY DUTY METAL PARTING APPARATUS F'iled April ll, 1952 v 2 Sheets-Sheet 2 FHEE- lnventmzs: 660 965 A (42759 and 95'5457/4/v Ju/vrq,

QOM Q/O United States Patent Ofitice knit HEAVY DUTY METAL PARTING APPARATUS George L. Carter and Sebastian Junta, Pittsburg, Calif. Application April 11, 1952, Serial No. 281,864

2 Claims. (Cl. 16446) The present invention relates to metal parting apparatus, and has for its general object the providing of an improved manually operable heavy duty device for parting hard or cold drawn metal objects, such as rods and the like.

Another object of the present invention is to provide a manually operable heavy duty metal parting device having means incorporated in the structure thereof for intensifying the manually applied force.

It is another object of the present invention to provide a heavy duty metal parting device which is sturdy in construction and simple of operation, repair and replacement of parts.

It is a further object of the present invention to provide a manually operable apparatus which when used to sever a metal rod produces fracture ends on the parted rod suitable for subsequent butt welding.

These and other objects will become more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is a side elevation of the device in first stage of operation;

Figure 2 is a view similar to Figure 1 showing the device in the intermediate stage of operation;

Figure 3 is a view similar to Figures 1 and 2 but showing the device after completion of the severing operation;

Figure 4- is a plan view of Figure 3;

Figure 5 is an end view of Figure 3; and

Figure 6 is a shaft detail view.

Referring more particularly to the drawin s, reference numeral 2 indicates a horizontally disposed supporting plate having a frame member 4 mounted thereon. The frame member 4 is made up of a pair of spaced vertical wall plates 6 having flange bottoms 8. The flanges 8 are provided with bolt holes 19 for accommodating bolts 12 which attach the frame 4 to the supporting plate 2.

A blade 14 having a cutting jaw 16 is fixedly attached between the lower portions of the wall plates 6 with the cutting jaw extending outwardly from the forward end 18 of the frame. The blade 14 is fixedly attached by means of a bolt 2%) which also serves to hold the plates 6 in position as shown in Figure l and a shaft or pin 26.

Each of the wall plates 6 is provided with a rounded cam projection 22 on its upper right-hand corner as seen in Figure l. The cam projections 22 are provided with countersunk holes 24 therein for receiving a shaft or pin 26. As best shown in Figure 6, the shaft or pin 26 is provided with turned down ends forming shoulders. The turned down ends of the pin extend through the holes 24 with the shoulders fitting in the countersunk portions thereof. Pin 26' which attaches the stationary blade 14 to the walls 6 is fitted in the same manner. A lever 30 is pivotally connected at one end to the shaft 26. A link 32 is pivotally attached by one end to the lever 30 at a point 34 intermediate its ends. The link 32 extends from its connection at 34 to a point adjacent the pivoted end of the lever. The link 32 is U-shaped in cross section and has two leg portions 36. Each of the legs 36 is provided with a cam follower portion 38 which is adapted to engage one of the rounded cam projections 22 as the lever 36 swings downwardly. A second link 4% is pivotally connected to the end of the link 32 adjacent the cam follower portions. A movable blade 42 having a cutting jaw 44 on one end is pivotally mounted between the upper portions of the wall plates 6 with the jaw 44 projecting from the forward end 18 of the frame in a plane above the jaw 16. The blade 42. is pivoted at a point adjacent its jaw 44- by means of a pin 46 which passes through the blade and the wall plates 6. The rearward end 48 of the blade 42 is pivotally connected with the lower end of the link 40, thus, when the lever 30 is swung downwardly the rearward end 48 of the blade 42 will be raised and cause movable jaw 44 to move toward the stationary jaw 16. law 44 is disposed directly above the jaw 16 so that their rod parting edges 44 and 16' respectively contact each other when the jaws are closed as shown in Figure 3. This arrangement differs from the conventional metal shears where the cutting edges are arranged to slide past each other when the jaws are closed. The jaws of my invention do not carry on a shearing action but rather sever or part the metal so that the fracture ends are suitable for subsequent butt welding without further treatment or dressing. Sheared ends such as those produced by conventional metal shears cannot be butt welded without further treatment.

A pair of retaining bars 56) each having a rod-supporting end 52 are pivotally mounted on the outside surface of each of the wall plates 6 in the same horizontal plane as the lower blade 14 with the rod-supporting end adjacent the jaw E6. The rearward ends 54 of the retaining bars 50 are counterweighted so that the rod supporting portions thereof are urged constantly up\ 'ardly.

In operation, the object to be cut, such as a rod W, is positioned between the cutting jaws 16 and 44. In entering the jaws, the rod W depresses the rod-supporting end of the counterbalanced retaining bar 5t) and is locked in place when the rod-supporting end 52 rises under the rod W. To sever the rod W, the lever 36 is pulled forward through the position shown in Figure 2 to the position shown in Figure 3. The action of pulling the lever 30 downwardly brings the cam follower portions 38 of the link 32 in contact with the rounded cam projections 22 on the frame 4 and causes the link 40 to be raised thereby raising the rearward end 48 of the blade 42 to move the cutting jaw 44 toward the jaw 16.

As is shown in Figures 2 and 3, the cam follower portions 38 slide around the rounded cam projections 22 of the frame 4 and cause the jaws 16 and 44 to close with the edges 16 and 44 abutting each other and severing the rod W. The cooperative functioning of the cam projections 22 and the cam follower portions 38 provides a gradual increase in the force created when the lever 39 is swung downwardly and brings about a secondary multiple lifting force on the movable bladev As is shown in Figure 6, the shafts 26 and 26' act as bearings for supporting the heavy loads created by operation of the severing device and also act as a spacer in holding the two wall plates 6 in proper position.

While one embodiment of our invention has been shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

We claim:

1. A manually operable metal severing device comprising a frame, a blade fixed in said frame and projecting therefrom on one side, a second blade pivoted in said frame and projecting therefrom on said one side for cooperation with said fixed blade, said blades being disposed in the same vertical plane, an operating lever pivoted to the upper portion of said frame, said frame including a pair of spaced vertical walls, and a shaft extending through aligned holes in said walls for pivotally can'ying said lever, said holes having counterbores on the inner ends thereof for seating the end portions of said shaft, a first at one end to said first link and at the other end to a point on said lever intermediate its ends, a cam surface exposed on the top ofsaid frame adjacent the axis on which said lever is pivoted, said second link having a cam follower portion adjacent said one end thereof adapted to engage. and ride on said cam surface as said lever swings downwardly to move the projecting end of sad pivoted blade toward the projecting end of said fixed blade to sever a metal workpiece therebetween, the engagement of said cam projections by said cam follower portion as said lever swings downwardly increasing the leverage between the projecting ends of said blades.

2. A manually operable metal severing device comprising a rectangular frame having two spaced vertically disposed walls, a blade fixed in the lower portion of said frame and projecting therefrom on one side, a second blade pivoted in the upper portion of said frame and projecting on said one side for cooperation with said first blade, said blades being disposed in the same vertical plane, a rounded cam projection on each of said walls on the corners thereof substantially diametrically opposed from the projecting portion of said fixed blade, said cam projections having aligned holes therein having counterlink pivoted to said second blade, a second link pivoted V 4. t bores on the inner sides thereof, a shaft fitting in said holes and extending between said projections with an end portion of said shaft resting in each of said counteroores, an operating lever pivoted at one end on said shaft, a first link pivoted at one end to the end of said pivoted blade opposed from its projecting end and extending therefrom to a point adjacent said projections, a second link pivoted at one end to the end of said first link adjacent said projections and at its other end to a point on said lever intermediate its ends, said second link being U-shaped in section with a cam follower portion on each leg adapted to engage and ride along said cam projections as said lever swings downwardly to move the projecting end of said pivoted blade toward the projecting end of said fixed blade to sever a metal workpiece therebetween, the engagement of said cam projections by said cam followers as said lever swings downwardly increasing the leverage between the projecting ends of said blades.

References Cited in the file of this patent UNITED STATES PATENTS 1,613,568 Porter Jan. 4, 1927 1,689,648 Voleske Oct. 30, 1928 1,725,626 Eyre Aug. 20, 1929 1,733,056 Eyre Oct. 22, 1929 2,465,392 Nickell Mar. 29. 1949

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