Roll straightening tool
AssigneeBrammall, Inc.
InventorJames Van Gompel
Life of this patent
Estimating the term…
Abstract
Apparatus that is used to expand a collapsed hollow core of a damaged roll which includes an expandable bullet, uniformly expandable along its length by hydraulic cylinders, after being pulled into the core by means of a hollow piston ram and a drawbar. The bullet has an unexpanded cross-section of a football-like shape the area of which is about 10% less than the cross-sectional area of the hole in the undeformed core, allowing over expansion of the bullet which pulls the sides of the core in to form connecting chords. Add-on shells for larger cores are adaptable to the expandable base bullet.
Claims6
In a roll straightening apparatus with a bullet having an expansion shoe mounted thereon, a hydraulic cylinder mechanically mounted within said bullet;
- and a common hydraulic connection at one end of the bullet wherein the expansion shoe moves laterally in response to hydraulic fluid being supplied to said hydraulic cylinder by means of the common hydraulic connection an improvement comprising:
- smooth, curved, exterior surfaces on said shoe and on said bullet, a drawbar arranged with a mechanical mating means at one end to connect with the opposite end of said bullet;
- a hollow piston hydraulic ram with a hollow movable piston adapted to move said drawbar horizontally, having means for mechanical support with respect to a work surface such that the distance between said hollow piston and the work surface is adjustable;
- and wherein said means for mechanical support includes an annular shaped restraining member removably mounted and positionable adjacent an end of a hollow core of the roll to be straightened to apply force to the roll to prevent telescoping as said bullet is pulled into the roll from the opposite end by horizontal movement of said drawbar.
In an expanding apparatus usable to expand a hollow cylindrical roll of material, the apparatus has an elongated body having a tapered front end and a shoe laterally movable by means of a hydraulic cylinder in the body, an improvement comprising:
- a curved, smooth lower surface on said body,
- an axially oriented threaded hole in said tapered front end of said body,
- and means for pulling said body into position within the roll to be straightened comprising:
- a rod with a threaded end adapted to engage said threaded hole in said front end of said body,
- hydraulic means for moving said rod and said body essentially horizontally to pull said body into position within the roll to be straightened.
In a roll expanding apparatus with an elongated body having a tapered front end and a shoe laterally movable by means of a hydraulic cylinder in the body an improvement comprising:
- first and second elongated expander shoes to adapt the apparatus to expand rolls having an interior radius greater than the unexpanded height of said body,
- said first elongated expander shoe has an interior region that is adapted to receive the laterally movable shoe therein,
- said interior region includes a pair of spaced apart surfaces adjacent a pair of spaced apart straight sides on the laterally movable shoe to prevent rotary movement of said first elongated expander shoe with respect to the body, said first elongated expander shoe has a smooth, curved exterior surface, said exterior surface has a curvature corresponding to the curvature of the interior of the roll to be straightened and an arc length a selected amount less than one-half the circumference of the interior of the roll to be straightened and a selected amount greater than one-quarter of the circumference of the interior of the roll to be straightened,
- said second elongated expander shoe has an interior region adapted to receive a section of the elongated body extending beneath and adjacent the hydraulic cylinder, said interior region includes a pair of spaced apart surfaces adjacent a pair of spaced apart straight sides on the body to prevent rotary movement of said second elongated expander shoe with respect to the body, said second elongated expander shoe has a smooth, curved exterior surface, said smooth curved exterior surface has a curvature corresponding to the curvature of the interior of the roll to be straightened and an arc length a selected amount less than one-half the circumference of the interior of the roll to be straightened and a selected amount greater than one-quarter of the circumference of the interior of the roll to be straightened.
Dependencies are inferred from the claim text.