Tire casing assembly drum

Abstract

The present drum can find application mainly for assembling large-size tire casings. The drum comprises sectors with shoulders provided with a drive for their radial movement. The drive incorporates slide-blocks arranged concentrically with each other on a shaft axially movable therealong. The slide-blocks are articulated, through levers, with the sectors. The midpoint of one of the levers of each slide-block is articulated with the shaft through the link which is half as long as the lever. The shoulders are provided with a mechanism for their relative movement with respect to the sector. The mechanism is made as a cam associated with the lever of radial movement drive of the sector. The cam is adapted to engage one of the toothed segments articulated to the sector. The toothed segments are kinematically associated with each other and are in mesh with the respective toothed racks connected to the shoulders, so that the toothed segment engages the cam through the agency of a pin provided on the cam. The kinematic association between the toothed segments may be in fact a link articulated to the toothed segments, while the hinge joints of the link are arranged on both sides of the plane passing through the axes of rotation of the toothed segments. According to one of the embodiments of the present invention the mechanism of movement of the shoulders relative to the sector is made as a number of links, each of which is articulated to the shoulder and to the member articulated to the sector. The levers of the drive for radial movement of the sector are provided with stops adapted to engage the links. One of the stops is made as a cam articulated to the sector and kinematically associated with the lever.

Dependencies are inferred from the claim text.