Control fixture for a tire bead compression testing machine

摘要

A control fixture (20) for a tire-bead compression testing apparatus comprising a plurality of radially movable segments and force-sensing instrumentation contained in at least some of these segments. The control fixture (20) comprises a plurality of plunger assemblies (24) and each plunger assembly (24) includes a plunger (32) for attachment to one of the radially movable segments, a casing (34) for sliding receipt of the plunger (32), and a spring (36) positioned between the plunger (32) and the casing (34). In this manner, force-sensing instrumentation can be used to determine the spring constant of the spring (36) and the consistency of the apparatus thereby confirmed.