| 摘要 |
<p>In a plate insert type ramp (1) having a resin ramp body (2) and a metal reinforcement plate (12) buried in the ramp body (2) by insert molding, a breakage prevention structure of the ramp being capable of suppressing the occurrence of breakage in a resin near the peripheral edge part of the plate (12) due to heat shrinkage without increasing the wall thickness of the resin near the peripheral edge part of the plate (12) or without reducing the thickness of the plate (12). A part or all of the peripheral edge parts (12a), (12b), (12c), and (12d) of the reinforcement plate (12) are exposed from the ramp body (2) to the front surface beforehand to prevent the resin near the peripheral edge parts (12a), (12b), (12c), and (12d) of the reinforcement plate (12) from being broken due to heat shrinkage. The portions of the plate to be exposed are clearance portions (8) between a plurality of disk insertion parts (4) formed at one of four sides of the ramp body (2) and/or the peripheral edge parts of the ramp body (2) at its other three sides.</p> |
