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Publication numberUS3452584 A
Publication typeGrant
Publication dateJul 1, 1969
Filing dateDec 23, 1966
Priority dateDec 24, 1965
Also published asDE1956608U
Publication numberUS 3452584 A, US 3452584A, US-A-3452584, US3452584 A, US3452584A
InventorsJones Alec John
Original AssigneeTi Group Services Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mandrels for use in the production of tubes
US 3452584 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

July 1, 1969 JQNES 3,452,584

MANDRELS FOR USE IN THE PRODUCTIQN OF TUBES Filed Dec. 23, 1966 United States Patent US. Cl. 72-466 2 Claims ABSTRACT OF THE DISCLOSURE A combination of a readily engageable and disengageable mandrel and plug made up of a mandrel, and an adaptor on the end of the mandrel which adaptor has a shoulder portion and a frustoconical spigot projecting from the shoulder portion. The spigot has a longitudinal tranverse slot which carries a resilient plate. The plate has a pair of spaced limbs directed towards the free end of the spigot, and each limb has an outwardly projecting portion at its end which projects beyond the surface of the spigot. A plug is fitted onto the spigot and has a socket for receiving the spigot and an enlarged cavity in which the projections on the ends of the limbs are received. The plug, when mounted, bears against the shoulder on the adaptor.

This invention relates to mandrels for use in the production of tubes by a process in which a heated billet is formed into a tube by being helically fed onto a plug, carried on the end of a mandrel, by means of rolls driven on skew axes.

The plug is required to withstand considerable heat and rubbing pressure and it has been found that the life of a plug can be extended by changing plugs for each new billet. In this way the used plugs can be cooled, as required before reuse.

It is thus necessary to provide some readily engageable and disengageable means for retaining the plug on the mandrel. The plug retaining means should be such that the plug can be removed by a simple pulling action and replaced by a pushing action. At the same time the plug must be held in place so that it does not drop from the end of the mandrel inadvertently.

In accordance with the invention there is provided the combination of a mandrel an adaptor on the end of the mandrel, which adaptor has a shoulder portion and a frustoconical spigot projecting from the shoulder portion, the spigot has a longitudinal transverse slot which in turn has a resilient plate mounted in it. The plate has a pair of spaced limbs directed toward the free end of the spigot, there being outwardly projecting portions at the ends of the limbs which project from the surface of the spigot. Finally, a plug is fitted on the spigot and has a socket for receiving the spigot and has an enlarged cavity in which the projections on the ends of the limbs are received. The plug bears against the shoulder on the adaptor.

Reference will now be made to the accompanying drawing in which FIGURES 1 and 2 are mutual perpendicular sectional views showing one example of the invention taken along section lines I-I, I=III, respectively.

Referring to the drawings it is desired to mount a plug on the end of a mandrel 11. To this end the plug 10 is formed with a socket constituted by a recess 10 tapering from an annular end face 10 to a constricted throat 10. Beyond the throat 10 the recess is enlarged to form a cavity 10 Provided on the mandrel 11 is an adaptor 12 formed with a frusto-conical spigot 13 adapted to fit in the tapering portion of the recess 10 so that the face 10 of the plug 10 can abut against a shoulder 14 on the adaptor. Formed in the spigot 13 is a transverse slot 13 which extends from the shoulder 14 up to the free end of the spigot 13.

Mounted within the slot 13 is a resilient plate 15 of generally U-shaped form. The two limbs 15 of plate 15 are directed towards the free end of the spigot 13 and the plate is held in position by a peg or screw 16 extending across the slot 13 through a hole in the plate 15 adjacent the shoulder 14. Adjacent the free end of the spigot 13 a roller 17 is mounted between the limbs 15 to keep these properly orientated.

As shown the limbs 15 do not project from the surface of the spigot 13 except at their free ends where there is a projecting portion 15 on each limb. At each end of each portion 15 there is an inclined cam surface.

Thus, in use, the plate 15 collapses resiliently when the plug 10 is pushed on or pulled off the spigot. It provides, however, a sufiiciently secure connection to prevent inadverent separation of the plug from the mandrel. This is of some importance in a three-roll piercing machine, where premature separation of the plug from the mandrel may result in seveer damage to the rolls.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In combination a mandrel; an adaptor on the end of said mandrel, said adaptor having a shoulder portion; a. frustoconical spigot projecting from said shoulder portion, said spigot having a longitudinally extending transverse slot; a resilient plate mounted in said slot and having a pair of spaced limbs directed toward the free end of said spigot and outwardly projecting portions at the etnds of said limbs projecting from the frustoconical surface of said spigot; and a plug fitted on said spigot, which plug has a socket to receive said spigot and an enlarged cavity in which said projections on the ends of said limbs are frictionally received, the plug bearing against said shoulder on the adaptor.

2. The combination claimed in claim 1 in which said resilient plate is of U-shaped configuration and in which there is provided a pin passing through said spigot and said plate adjacent said shoulder, and a roller mounted in said slot adjacent the free end of said spigot to retain said plate in the proper orientation.

References Cited UNITED STATES PATENTS 1,989,507 1/1935 Diescher 72-208 2,167,424 7/1939 Novack 72-209 2,257,979 10/1941 Rubinstein 287-124 FOREIGN PATENTS 987,512 3/1965 Great 7 Britain.

CHARLES W. LANHAM, Primary Examiner. l

A. RUDERMAN, Assistant Examiner.

US. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1989507 *May 3, 1933Jan 29, 1935Diescher Tube Mills IncRolling mill mandrel
US2167424 *Mar 29, 1938Jul 25, 1939Nat Tube CoPipe or tube making
US2257979 *Dec 23, 1939Oct 7, 1941Globe Union IncCombined shaft bearing and coupling
GB987512A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4483638 *May 29, 1981Nov 20, 1984VallourecDevice for fixing a piercing or expanding plug to a piercing or expanding bar
US5145275 *Dec 31, 1991Sep 8, 1992Claude AlainTruss beam coupler
US6036398 *Jun 22, 1998Mar 14, 2000Theodorou; AntonisExtruded frame member for structural connection and method of forming same
WO1999067541A1 *Jun 18, 1999Dec 29, 1999Antonis TheodorouExtruded frame member for structural connection and method of forming same
Classifications
U.S. Classification72/466, 403/326
International ClassificationB21C3/00, B21B25/00, B21C3/16
Cooperative ClassificationB21B25/00, B21C3/16
European ClassificationB21C3/16, B21B25/00