US20128A

US20128A - Benjamin pitchee

Info

Publication number: US20128A
Authority: US
Publication date: 1858-04-27
Anticipated expiration: 1875-04-27

Description

B. PITCHER. Machine for Bending MetallicMold Boards.

Patented April 27, 1858.

UNITED STATES PATENT OFFICE.

BENJN. PITCHER, OF PEORIA, ILLINOIS, ASSIGNOR TO HIMSELF, WM. TOBEY, AND JOHN ANDERSON, OF SAME PLACE.

BENDING MOLD-BOARDS FOR FLOWS.

Specification of Letters Patent No. 20,128, dated April 27', 1858.

To all whom "it may concern;

Be it known that I, BENJAMIN PITCHER, of Peoria, Peoria county, in the State of Illinois, have invented certain new and useful Improvements in Machines for Bending Metallic Mold-Boards for Plows, of which the following is a full, clear, and exact description, reference being made to the accompanying drawings, forming part of this specification.

Figure 1, represents a perspective view of a machine for bending mold boards for plows, embracing my improvements. Fig. 2 represents an end elevation of the upper and lower die, with the plate in position to be bent.

In manufacturing mold boards for plows from wrought iron or steel plates, great difiiculty is experienced in giving to the plates a set, or permanent bend, so that they will retain the shape imparted to them by the forming dies or rollers. This difliculty arises from the elasticity of the material, as well as the light curve of the mold board.

In bending metal plates, it is necessary in order that the plate may retain the form given to it when released from the machine, that it should be so acted upon during the process of bending, as to cause a rearrangement of the molecules or fibers of the metal, so as to conform to the curves and bends given to the plate by the bending dies or rollers.

The machines heretofore constructed for bending mold boards for plows, bend without compressing or drawing the plate, so as to produce a rearrangement of the fibers of the metal; hence it is that, the plates bent by these machines do not permanently retain their form, but spring out of shape.

To overcome this defect, and thus give a permanent set to the plate during the process of bending, is the object of my improvement, and my invention for effecting this object, consists in the arrangement of the bending dies, and in the position in which they are hinged, or connected with each other, so that they will bend the plate nearly into shape without cramping it and then compress and draw it from the rear to the front of the dies, without releasing the The lower and convex die (B) is firmly s ecured to the table, and to it is hinged the concave die (C), by ears (a, 6) cast on the straight edge of both dies, through holes in which passes a rod (61) and connects the dies. A link (E) hingedto the front edge of the upper die is also pivoted at its lower end to a lever (D) by which power is applied to operate the upper die.

The plate to be bent is heated to a red heat, and entered between the dies; the rear end of this plate resting against the lower edge of the upper die, and on the convex surface of the lower. As the upper die is brought down, its front end comes against the outer edge of the plate, and bends it around the lower die nearly into shape before it is grasped or held in any manner that would prevent the whole upper and convex surface of the plate from stretching or being drawn out while it is being bent to the curve of the lower convex die. The dies first close on the plate at the rear end, holding it at this point, and as they are closed, the plate is gradually compressed and drawn out or stretched from the rear to the front of the dies, and parallel to their center of motion, and no portion is released after being compressed, until the entire plate is bent, compressed and drawn, which causes a rearrangement in the fibers of the metallic plate to conform to the curve given to it by the dies, so that a permanent set is given to bends in the plate.

Having thus described my improvement in machines for bending mold boards for plows, what I claim thereon as new, and desire to secure by Letters Patent is.

The combination of the stationary die until the entire bending is completed for (B) with the movable die (0) hinged to the the purpose described. 10 stationary, and constructed and arranged as In testimony whereof I have subscribed described, so that the heated metallic plate my name. subjected to their action is during the BENJAMIN PITOHER. process of being bent into shape gradually Witnesses: compressed and drawn from its inner to its WM. WVEIs, outer edge and retained under compression WILLIAM TOBEY.