US577296A - Seamless tubes from mandrels - Google Patents

Description

no Model.) 2 SheetsShee-t i.

R. F. HALL, F. WARWICK & T. SMITH. MEANS FOR REMOVING QFIAMLESS TUBES FROM MANDRELS.

310.577.2965. Patented. Feb. 16, 1897.

N5 Model.) 2'Shets-Sfleet 2.

R. F. HALL, 1?.WARWIGK &-T. SMITH. MEANS FOR REMOVING SBAMLESS TUBES FROM MANDRELS.

No. 577,296. Patented Feb. 16, 1897.

- 1 a Z a & 51 v 0' b w| NESS-ES I INVENTORS fie rZJfIaZZ. flf f w .Z w mz i /T M mingham,

" UNITED STATES PAT NT OFFICE.

ROBERT HALL, FREDERICK WARWICK, AND THOMAS SMITII, or

- BIRMINGHAM, ENGLAND.

MEANS Fen REMOVING SEAMLESS'TUBES FROM MANDRELS.

SPECIFICATION forming part of Letters Patent No. 577,2 96, dated February 16, 1897.

\ Application filed June 1, 1896. Serial No. 593,876. (No model.)

T aZZ whom it may concern:

Be it known that we, ROBERT FREDERICK HALL, of SherlockStreet, in the city of Bir- FREDERICK WARWICK, of the Dingles/ Shirley, near Birmingham, and THOMAS SMITH, of Wharf Street, Aston, near Birmingham, England, have invented certain new and useful Improved Means for Removing Seamless Steel Tubes from Mandrels, of which the following is a spbcification.

This invention relates to an improved and simplified machine for removing seamless complished by what is known steel or other tubes from their mandrels.

In manufacturing weldless steel tubes produced upon solid mandrels it is difficult to withdraw the tube from off the mandrel or to remove, the mandrel from the tube, and this is done often at a great risk of injuring the constitution of the metal from whichthe said tube is made. The removal is usually acas a reelingmachinefl which rotates the tube and'mandrel together and by applied pressure slightly spreads or increases the internal diameter of the tube formed and thereby loosens the same on the mandrel, when the said tube can be easily withdrawn.

The removal of thin gage-tubes (such as are usually used in cycle-work) is fraught with difficulties on account of the liability of the same to be externally injured and scratched, and oftentimes they burst.

According to our improvements the walls of a drawn tube are loosen ed from its mandrel by a straight rolling process, which consists in passing the tube while on the mandrel between two counterpart rolls, one of' which is mounted directly above the other, and each roll having a V-shaped groove in its periphery, so that the walls formed by the said grooves will bear against the tube at four distinct and separated points to secure four distinct clearance-spaces, which admit of the flowing of the metal displaced, it being understood that this is accomplished with a single pair of rolls. In order to enable others skilled in the art to make, use, and practice our invention, we will now proceed to describe the same in detail, reference being had for this purpose to the accompanying drawings, in which Figure 1 represents a front elevation of a Fig. 2 is a located The letters a and 1) indicate a pair of rolls located one above the other and each having a V-shaped groove in its periphery forming the inclined walls a a and b b. The upper roll a is provided with axles or journals a a which are mounted to run freely within the bearings e formed in the ends 6 of an adjustable stirrup c This stirrup is arranged to slide vertically in guides'formed in the bolster or frame d, and may be adjusted to various heights with respect to the lower roll by means 7 of the hand-screw f. The lower roll vided with similar axles or journals b 12 which are loosely mounted in t e bearings 0, formed in or carried by the bolster or frame d. The reference-letter 9 indicates a bar or 8 mandrel, and h is the tube, formed upon said mandrel, and which is to be loosened and removed as follows: The tube and mandrel are forced or drawn through the substantially angular space'formed between the two rolls 8 by the inclined walls a a and b b, said tube coming in contact with the said inclined walls at four separate and distinct points, as shown, and between each pair of contact-points is a clearance-space i (four in all) to admit of the expansion or flow of the displaced metal. The bore of the tube is thereby slightly enlarged, so as to admit of the same being easily, stripped from the mandrel.

It is to be noted that the tube is acted upon 9 at four separate and distinct points by the single pair of rolls, this being-accomplished by the peculiar shape of the groove in the periphery of said rolls.

We are aware that it is broadly old to pro- I vide an apparatus for removing tubes from their mandrels wherein the tubes are acted b is proupon 011 four different sides by two pairs of rolls, one pair beingarranged at right angles to the other pair, and each roll having a concaved groove in its periphery. By our invention we dispense entirely with one pair of such rolls and accomplish the same result with a single pair of peculiar construction.

What we claim is- A machine for releasing a tube from a mandrel, consisting of two counterpart rolls journa-led one above the other and each having a V-shaped groove in its periphenv, the walls of which bear against the tube at [our dis-

Images