| 摘要 |
<p>There is disclosed a mechanical type of device, effective to suitably spread apart the new tread rings to be applied on the carcasses of worn tires, in the retreading process thereof. The device comprises, substantially, a base (1), bearing a horizontally extending shaft (3) effective to rotate about the axis thereof and at one end thereof there is keyed a bevel gear wheel (5). The latter meshes with a plurality of bevel sprockets, which are located along a circumferential line and having perpendicular axes intersecting the axis of said bevel gear wheel (5). Each sprocket (16) is mounted at one end of a round cross-section bar (13) the other end thereof is provided with a threaded portion (14) engaging with a nut screw (17) formed in a block which supports cantilever-wise a rod (18). In operation, by rotating the mentioned horizontally extending shaft (3), the individual blocks (17) thereinabove mentioned jointly move along the threaded portion (14) of their respective round cross-section bar (13), thereby causing the related rods (18) to move away from one another or approach one another.</p> |
