US 4,007,622 AGranted

Device for bending thin-walled pipes

OwnerAbram Isaevich Galperin, Lev Vladimirovich Vishnyakov +4inventors

InventorsAbram Isaevich Galperin, Lev Vladimirovich Vishnyakov, Boris Vladimirovich Pokrovsky, Vladimir Ioganovich Kalganov, Boris Borisovich Vasiliev, Igor Nikolaevich Kotikov

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Abstract

Device for bending thin-walled pipes from inside by embossing them with eccentric corrugations, comprising an expander block introducible into the pipe to the point of bend, the block being formed by a supporting shoe and a punch whose side facing the pipe has a toroidal surface following the shape of the desired corrugation and which is mounted on the shoe with a provision for positive movement in a radial direction to the pipe surface for making the corrugation on the pipe. In the cross-sectional plane of the pipe the punch has the shape of a ring which is open at the side of the shoe and is composed of individual elements around its parameter, each element being articulated to a movable member of one of the power cylinders whose axes are arranged radially to a cross-sectional plane of the pipe while their stationary members are connected with the supporting shoe. The stroke of the movable elements of the power cylinders is practically equal to the height of the corrugation on the corresponding generatrix of the pipe.

Claims5

Dependent claims

A device for bending thin-walled pipes by embossing them with eccentric corrugations (C), comprising:

an expander block (2) introducible into a pipe (1) to be bent, to the point of the desired bend, and being formed by a supporting shoe (3) and a punch (4), the latter being installed on the former, with provision for positive motion relative to said block in the course of the bending radially to the pipe surface, for making the desired corrugation on the pipe, the corrugation being eccentric to the pipe axis, and for thus bending the pipe;
said punch having the shape of a ring in a cross-sectional plane of the pipe, being open at the side of said shoe and composed of individual punch elements (7) around the circumference of said punch;
power cylinders (10) whose axis are arranged radially to a cross-sectional plane of the pipe, having movable members (9) that are respectively articulated to said punch elements while having stationary members (10) connected with said shoe;
said movable members making strokes that are substantially equal to the height (h) of the desired corrugation on the corresponding generatrix of the pipe.

1 more element

Dependencies are inferred from the claim text.