Method and device for connecting adjacent objects equipped with holes to each other

Abstract

A method is disclosed for connecting adjacent objects ( 1 ) such as paper rolls to each other, the method comprising the step of inserting a bushing ( 3 ) through the center bores of at least two adjacent paper rolls. The method is implemented by way of moving the parts of the bushing ( 3 ) formed by at least two parts in the bore of the objects relative to each other, whereby the parts are guided by the mating division surfaces (A, B) of the bushings, at least one of the mating surfaces having a spiraling shape, in the longitudinal axis direction of the bushing so that the outer diameter (U) of the bushing increases thus causing the bushing to expand tight in the center bores of the objects ( 1 ). The invention also concerns a device for connecting objects ( 1 ) to each other.

What is claimed is:  
     
         1 . A method for connecting adjacent objects ( 1 ) equipped with holes, such as paper rolls, to each other, the method comprising the step of inserting a bushing ( 3 ) through the center bores of at least two adjacent paper rolls, characterized in that the parts of the bushing ( 3 ) formed by at least two parts are moved in the interior bore of the objects relative to each other, whereby the parts are guided by the mating division surfaces (A, B, C) of the bushings, at least one of the mating surfaces having a spiraling shape in the longitudinal axis direction of the bushing, so that the outer diameter (U) of the bushing increases (by dU) thus causing the bushing to expand tight in the center bores of the objects ( 1 ).  
     
     
         2 . The method of  claim 1 , characterized in that, to clamp the bushing ( 3 ), a tool is used for imposing an axially aligned force (Fc) on the bushing inserted into the center bores of said objects so that the force works on at least one end of the bushing, advantageously on both ends thereof.  
     
     
         3 . A device for connecting adjacent objects ( 1 ) equipped with holes, such as paper rolls to each other, the device comprising a bushing ( 3 ) insertable through the center bores of said adjacent objects ( 1 ) to be connected to each other, characterized in that said bushing ( 3 ) comprises at least two separate parts cooperating with each other at the mating division surfaces of said parts, whereby at least one of the mating surfaces (A, B, C) formed between said parts is made at least partially spiraling.  
     
     
         4 . The device of  claim 3 , characterized in that the spiraling division surface(s) of the bushing ( 3 ) is/are divided into section(s) and the division is made in a stepped fashion.  
     
     
         5 . The device of  claim 3  or  4 , characterized in that one (A) of the mating division surfaces of the bushing ( 3 ) is made spiraling while the other one (B) is aligned parallel to the longitudinal axis of the bushing.  
     
     
         6 . The device of  claim 3  or  4 , characterized in that the mating division surfaces of the bushing parts are adapted to spiral in mutually opposed directions, whereby their wedge angles (β, ζ) can be equal or unequal.  
     
     
         7 . The device of  claim 3  or  4 , characterized in that the mating division surfaces of the bushing parts are adapted to spiral in the same direction, whereby their wedge angles aligned in mutually opposed directions.  
     
     
         8 . The device of any one of claims  3 - 7 , characterized in that said bushing ( 3 ) is made two-headed and divided in three parts, whereby the bushing clamping force (Fc) is applied from two directions.  
     
     
         9 . The device of any one of claims  3 - 7 , characterized in that said bushing ( 3 ) and the center cores ( 2 ) of the objects to be joined are of the same material.