Patent ID: 7798198

Claim:
A weight compensation device for a lifting door, in particular for a high-speed industrial door, said device comprising: a spring element, a tensile element and a winding device, wherein one end of the spring element can be secured to the floor, wherein the tensile element is attached by one end to the spring element and by the other end to the winding device, wherein the winding device can be coupled to a drive of the lifting door, and wherein the tensile element can be wound onto the winding device or unwound from it in such a way that the spring element has its maximum prestress when a door leaf of the lifting door is in the closed position, and is essentially relieved of stress when the door leaf is in the open position, wherein the tensile element has a smaller width at the end facing the winding device than at the end facing the spring element, and the winding device has a shaft and a guide device which is mounted thereon and by means of which the tensile element can be wound up in such a way that the windings are not in contact with one another, wherein, for this purpose, the guide device has, on its circumference, guide faces with a radius which increases continuously in the winding direction.