Patent ID: 6672128
Filing Date: 2004-01-06
Classification: B21D

Abstract:
A hand tool for the expansion of hollow bodies comprising a rack made of steel,a casing; a first hand lever affixed to said casing and projecting laterally; a second hand lever which consists of steel and is joined pivotally with the casing on a side turned away from the first hand lever and which bears a pinion partially encompassing a shaft and is brought beyond the casing such that the first hand lever and the second hand lever form pliers, the first hand lever having one or two flanges, wherein a through bore is arranged in the casing for the guidance of said steel rack, one end of said rack within the bore cooperates with the pinion such that an expansion wedge can be displaced by a closing movement of the first and second hand levers, the casing further comprising means by which an expansion head with radially movable expander jaws can be placed coaxially onto the outwardly tapered end of the expansion wedge, wherein said casing with the bore and the first hand lever affixed to the casing together comprise a light material selected from the group consisting of plastics and light metals lighter than steel, wherein said casing and said rack together form a low-friction mating of light material with steel.