USRE9929E - knowlbs - Google Patents

Description

2 8heetsSheet 1'. W W. KNOWLES,

Assignor, by mesne assignments, to J. B. SAVAGE and THE ATWATER MANUFACTURING W. W. Woommw.

METHOD OF FORMING CARRIAGE STEPS.

Reissued Nov. 15,1881.

COMPANY and N, PETERS Mulhngrayhev. viz-lumen. DJ:

2 Sheets8heet 2.

W. W. KNOWLES,

Assignor, by mesne assignments, to J. B. SAVAGE and THE ATWATER MANUFACTURING COMPANY and" W. W. Woonmmr.

- METHOD OF FORMING CARRIAGE STEPS. No. 9,929. Reissued Nov. 15,1881.

the steps.

. plan view of the face of the same.

UNITED STATES PATENT OFFICE.

WILSON l/V. KNOWLES, OF PLANTSVILLE, ASS IGNOR, BY MESNE ASSIGNMENTS, TO J. B. SAVAGE AND THE ATWATER MANUFACTURING COMPANY, OF SOUTHINGTON, AND WALTER W. VVOODRUFF, OF MOUNT CARMEL, CONN.

METHOD OF FORMING CARRIAGE-STEPS.

SPECIFICATION forming part of Reissued Letters Patent No. 9,929, dated November 15,1881,

Original No. 104,040, dated June 7, 1870. Application for reissue filed July 11, 1881.

To all whom it may concern Be it known that I, WILsON W. KNowLEs, of Plantsville, in the county of Hartford, and in the State of Connecticut, have invented a certain new and useful Method of and Dies for Forming Carriage-Steps; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings making a part of this specification, in which Figure 1 is a plan view of a rough blank used in forming astep. Fig. 2 is a like view of the lower side of said blank after it has been further operated upon by forming-dies. Figs. 3 and 5 show two modifications in the form of Fig. at is a view of the lower side of a completed step. Fig. 6 is a sectional view of the same, taken on linewmof Fig. 4. Figs. 7 and S are perspective views of the dies used for forming the shank of the step. Fig. 9 is a Fig. 10 is a perspective view of the upper die for forming the step. Fig. 11 is a like view of the corresponding lower die, and Fig. 12 is a plan view of the face of the latter.

Letters of like name and kind refer to like parts in each of the figures.

As ordinarily constructed, carriage-step pads are cut from sheet metal and properly shaped, after which they are welded to the shank; but experience has proved that this method is open to serious objections, on account of the inferior quality of the work and also the cost of its production.

To obviate these objections is the design of my invention, which consists, principally, in producing a carriage-step, substantially such as is herein shown and described, from a solid bar of iron without Welding by means of the hereinafter-described method.

It also consists in the employment of a series of dies for use successively in forming or shaping said step, by means of which dies a better and more accurately-finished article is secured, and time and labor economized in its production, as is hereinafter shown and de scribed.

In the manufacture of carriage-steps by 111 method a series of dies are successively used in connection with one or more drop-presses,

the lower die of each pair being stationary within the bed-plate, while the upper one is' attached to and, carried by a ram or drop, and caused to impinge upon the work placed within or upon the lower die, and thereby give to '55 said work the desired form.

In order to form the step-blank A, a bar of iron having a suitable size is heated, and the shank B formed by means of the primary set of dies 0 and D, seen in Figs. 7 and 8, which 6c.

dies are provided at one side with corresponding peening faces 0 and D for roughly drawing out said shank, and have sunk within their contiguous horizontal and parallel faces corresponding half-round grooves c and d, within mensions are roughly obtained, leaving the blank in the form shown in Fig.1. A second set of dies are now employed to give form to the step-pad. These dies, when adapted to produce the particular form of step shown in Fig. 4, are represented in Figs. 10 and 11, the 7 upper one of which, E, has a plane horizontal face, while the lower die, F, is provided with a series of half-round grooves, f, arranged parallel with each other, and connected together at their ends by means of two other grooves,f, 8o

placed at a right angle with the former. A larger half-round groove, Gr, corresponding in size with the shank B, extends from the outer edge of the die into and through one of the transverse grooves, f, and connects with the 8 5 center one of the grooves f.

In order to furnish room below the surface of the die F for the increased size or swell of the shank B, the groove G is made much lower at its cuter than at its inner end, and from its size, being somewhat deeper at its point of intersection than the grooves f and f, the latter and the center one of said grooves f (see transverse sectionof step, Fig.6) are made to incline downward from'their outer ends to the 5 bottom of said groove G, by which construction the bars formed within said deepened grooves have a gradually increasing depth from their outer ends to their point of union with the shank. After reheating, the blank shown in Fig. 1 isplaced between theforming-dies E and F and receives a numberof blows, which will cause it to fill said die and assume the shape shown in Fig. 2, the metal being forced downward and sidewise, so as to raise and form the barsa and a, leaving them connected by means ofa thin diaphragm,m, and also leaving afin, z,

of corresponding thickness projecting horizontally from the edge of the step. The surplus metal, consisting of the diaphragm m and fin z, is then removed by means ofsuitable trim mingdies, after which the step is placed between the finishing-dies and completed, as shown in Fig. 3, by means of a few blows.

The finishing-dies are of the same generalform as those in which the step received its shape.

Although I preferably construct stepsin the form shown in Fig. 4, a great variety of other forms can be given to them. As anillustration ofa. slight change in form, Figs. 3 and 5 show two steps in which the bars a are placed at a right angle to instead ofin a line with the shank B, while a circular or an oval shape is given to the exterior of said step. Other changes will readilysuggestthemselves,butitisnotthought necessary to illustrate or describe them.

It is, of course, evident that whatsoever change is made in the step-pad a corresponding change must be made in the dies which throw the blank, Fig. 1, into the general form of the finished step.

As thus formed, the step and shank are composed of thesame quality of metal, which, from the peculiar action of the dies forcing it downward and sidewise, has all the toughness and tenacity of hammered iron,and, being without Wield, no breakage can occur from a defect in the workmanship. In addition to the above there is a decrease in the cost of the finished article, which results from the saving in material caused by forcing a portion of the iron that would otherwise be wasted sidewise into the bars, and also from the lessened amount of time and labor required in the production of the same. The step which is the product of these dies and process is the subject of an 'independent patent granted to myself.

Having thus fully set forth the nature and merits of my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The hereinbefbre-described method offorming carriage-steps, substantially such as herein shown and described, from a solid bar of iron without welding, which consists in roughly drawing out and rounding ,the shank in dies, flattening out the step end into a blank ot' a form approximating the step-pad to be produced, subjecting the same to the forming-dies and then to suitable trimming-dies, substantially as described, and for the purpose specified.

2. The series of dies for forming carriagestcps, consisting of the shank drawing and rounding dies and the step-forming dies, substantially as described, and for the purpose specified.

WILSON WV. KNOWLES.

Witnesses:

M. A. LEWIS, MARY J. LEWIS.

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