Patent ID: 9630805
Date: 2017-04-25
CPC Classifications: B66B,F16C

Claim:
1. A roller apparatus, comprising: a bearing wheel configured to rotatably couple the roller apparatus to a roller shaft; and a resilient member radially disposed about the bearing wheel and configured to contact a guiderail at different magnitudes of loads, the resilient member including a first section of a first diameter and a second section of a second diameter, the first section being caused to deflect in response to loads within a first load range, the second section being caused to deflect in response to loads within a second load range, the resilient member configured to exhibit a stepwise increase in stiffness with a gradual increase in load, the first diameter being greater than the second diameter, the first section including at least two separate, radially extended surfaces and the second section disposed between the at least two separate, radially extended surfaces, wherein the second section comes in direct contact with the guiderail upon the stepwise increase in stiffness.