US810241A

US810241A - Apparatus for reducing the ends of tubes.

Info

Publication number: US810241A
Application number: US22396604A
Authority: US
Inventors: Malcolm Wikstrom
Original assignee: SHELBY STEEL TUBE Co
Current assignee: SHELBY STEEL TUBE Co
Priority date: 1904-09-10
Filing date: 1904-09-10
Publication date: 1906-01-16
Anticipated expiration: 1923-01-16

Description

PATENTED JAN. 16, 1906.

APPLICATION FILED SEPT. 10, 1904.

2 SHEBTS-SHEET 1.

INVENTOR WITNESSES No. 810,241. PATENTED JAN. 16, 1906.

M. WIKSTROM.

APPARATUS FOR REDUCING THE ENDS 0F TUBES.

APPLICATION FILED SEPT. 10 1904.

' SHEETS-SHEET 2.

INVENTOR W was.

rinrrrin sra'rns PATENT OFFIOE.

MALCOLM WTKSTROM, OF SHELBY, OHIO, ASSIGNOR TO SHELBY STEEL TUBE COMPANY, OF PITTSBURG, PENNSYLVANIA, CORPORATION OF N EW JERS EY.

Specification of Letters Patent.

Patented. Jan. 16,1906.

Application filed September'lO, 1904. Serial No. 223,966.

To (LZZ whom, it may concern:

Be it known that I, MALCOL Wiics'rnoii, of Shelby, Richland county, Ohio, have invented a new and useful Apparatus for Beducing the Ends of Tubes, of which the following is a full, clear, and exact description reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 shows in front elevation dies constructed in accordance with my invention, these dies being in their fully-opened position and the tube to be reduced having been inserted therein. Fig. 2 is a like view showing the second'stage' of the operation, in which the dies have moved together sufficiently to flatten the tube to an oval'for'm and to cause it to fill the cavity of the dies, but without changing the length of the circumference of the tube. Fig. 3 is a similar view showing the final position of the die. Fig. 4: shows, on a smaller scale, a position of the dies intermediate between Figs. 2 and 3. Fig. 5 is a erspectivle view of the dies when open, and

ig. 6- is a perspectiveview of the reduced tube.

In the operation of cold-drawing seamless tubes it is necessary to reduce, or point, as it is generally termed, one end of each tube that is to say, to reduce its diameter so that it can be pushed far enough through thedie through which it is to be drawn toallow the tongs to grip it. Heretofore it has been the practice to reduce the tubes either by swaging mechanism and toggle-joint machines or by the use of hammers provided with halfround or V-sha ed dies or by the use of swaging-rolls. 4 ach of these modes of 0 eration has certain disadvantages, and al of them are slow, requiring several blows of the dies or hammer and turnings of the tube before the swaging can be finished, and it is also difficult to perform the operation so as to make the reduced end of the tube concentric with the tube-body.

The purpose of my invention is to provide means y which the pointing of the tube can, if desired, be accomplished at a single operation of the dies and symmetrical and concentric points he produced without difficulty.

The operation is performed with'such regularity as to reduce the waste. of the tube to a In the drawings, 2 3 are the parts of the die. They are made so as to work together, each being preferably formed with a series of comb-like projections 4 for interfitting with and sliding upon similar projections on the other die.

When the dies are at full open position, (shown at Fig. 1,) they afford a middle recess with angular top and bottom surfaces 5, adapted to engage the circumference of the tube 6, which is tobe reduced. The tube 6 is placed in the dies when in this position, and the parts of the dies are then brought to.- gether, either by strong pressure applied with a hydraulic press or otherwise or by means of the blow of a hammer. The first part of the approach of the dies causes the inclined surfaces 5 5 to act upon the tube at diametrically oppositepoints and to flatten-it into the form shown in Fig. 2. This'is done without reducing the circumference of the tube,

which when in this shape will approximately fill the die-cavity and will be, of substantially elliptical form in cross-section. During the further approach of the dies into the position shown in Fig. 3, the tubebeing held by the flat portions of thedie-cavity at opposite sides and being subjected to compression at the ends by the approaching dies, its sides will fold in toward each other into the final shape.

(Shown in Fig. 3.) The operation thus comprises an initial contraction of the diecavity on opposite sides, so as to flatten the tube, and then a compression of the tube on the other sides by whichit is folded in on the The end'thus made Will flattened surfaces. be perfectly concentric with the tube, and being made by the dies and always of the same length the waste can be reduced .to a minicomprising dies adapted to hold the tube in flattened condition at opposite sides, and

when so held to subject it to compression at the other sides at op osite points to cause the non-flattened sides to approach each other; substantially as described. 2. Apparatus for reducing the ends of tubes, comprising dies having an initial cavity for the end portion of the tube, acting portions which first flatten the tube in said cavity, and other acting portions which sub'se uently compress the non-flattened sides of t e flattened tube at right angles to the direction in which it was flattened, to force said sides to Ward each other and thereby cause them to fold inwardly {substantially as described.

,3. Apparatus for reducing the ends of tubes,

comprising dies having a plurality of interfitting slots and rejections recessed to form an initial cavity or the tube, and having acting portions which first flatten the tube to general oval form without materially changing the length of its circumference, and subsequently compressing the non-flattened sides of the tube toward each other {substantially as described. 7

4. The combination of die parts 'formed with interfitted comb-like projections having an initial cavity adapted to compress and flatten the tube in one direction and when more fully closed. to compress the tube at right angles thereto; substantiallyas described.

5. The/combination of'interfitting die parts having when fully opened middle inclined surfaces 5 which flatten the tube, and end portions 6 adapted to compress the non-flattened sides of the tube after it has been flattened by the surfaces 5; substantially as described. p

6. In apparatus for reducing the ends of tubes,-dies having surfaces which first flatten the tube, and other surfaces which subsequently compress 'the non-flattened sides toward each other to therewith cause opposite portions of the flattened sides to fold inwardl toward each other; substantially as described? In testimony whereof I have hereuntov set my hand.

MALCOLM WIKSTROM. Witnesses:

B. F. LONG,

.SADIE BUCK.