| 摘要 |
<p>PURPOSE:To permit the revolution connection by forming a hinge constitution part from an outward projection part having each arcuate projection surface and an inside projecting engagement part at each panel connection edge and fitting both the hinge constitution parts of a panel which are arranged in an abutment state, with the hinge constitution part of the constitution member, as for the two-stage dump door connecting device of the bed of a truck. CONSTITUTION:The lower bulging-out part 3 of the first hinge constitution part 2 of an upper rank panel 1a is inserted into the recesed part 29 of the third hinge constitution part 22 of a connecting member 21, in sliding from one edge part. Similarly, the upper bulging-out part 13 of the second hinge constitution part 12 of a lower rank panel 1b is inserted into the recessed part 39 of the fourth hinge constitution part 32 of the connecting member 21. The first and second hinge constitution parts 2 and 12 are constituted of the arcuate projecting surface parts 4 and 14 and the engagement parts 6 and 16 which are projectingly installed inwardly. The connection member 21 is constituted of the recessed parts 29 and 39 for fitting of the hinge constitution parts 2 and 12, guide surfaces 7, 17, 27, and 37 having each arcuate section, guide part 23, etc.</p> |
