Roller assembly

摘要

A roller assembly comprising: a roller housing comprising first and second side walls and first and second end walls forming an enclosure; a carriage assembly comprising a carriage body and at least two carriage wheels rotatably attached to the carriage body, wherein the carriage assembly is located within the enclosure such that the at least two carriage wheels are arranged to protrude from the bottom of the enclosure during use; wherein the carriage body comprises a support portion and at least two concentric pivot points arranged to locate within slanted passages formed in the first and second side walls to allow the carriage body to rotatably pivot about the pivot points; an intermediate adjusting mechanism slidably engaged with the roller housing and arranged to move lengthwise within the enclosure, the intermediate adjusting mechanism comprising a first engagement surface located on an extending member, wherein the extending member extends in a direction substantially perpendicular to the lengthwise movement of the intermediate adjusting mechanism and the first engagement surface is arranged to engage with the support portion; and an adjustment mechanism that passes through an adjustment aperture formed in the first end wall, whereupon movement of the adjustment mechanism the intermediate adjusting mechanism is caused to move lengthwise within the enclosure, wherein the movement of the intermediate adjusting mechanism causes the carriage body to move along the slanted passage.

主权项

1. A roller assembly comprising:
a roller housing comprising first and second side walls; a carriage assembly comprising a carriage body and at least two carriage wheels rotatably attached to the carriage body, wherein the carriage assembly is located within the housing such that the at least two carriage wheels are arranged to protrude from the bottom of the housing during use; wherein the carriage body comprises a support portion and at least two pivot points defining a pivot axis, the pivot points being arranged to locate within slanted passages formed in the first and second side walls, the carriage body being free to rotatably pivot about the pivot axis; an intermediate adjusting mechanism slidably engaged with the roller housing and arranged to move lengthwise with respect to the housing, the intermediate adjusting mechanism comprising a first engagement surface arranged to engage with the support portion, wherein the first engagement surface is located on an extending member, wherein the extending member extends in a direction substantially perpendicular to the lengthwise movement of the intermediate adjusting mechanism; and an adjustment mechanism accessible from a first end of the housing, wherein movement of the adjustment mechanism causes the intermediate adjusting mechanism to move lengthwise with respect to the housing, wherein the movement of the intermediate adjusting mechanism causes or allows the carriage body to move along the slanted passages; wherein the support portion comprises a round surface that is concentric with the pivot points and the first engagement surface of the extending member is arranged to engage with the round surface when the intermediate adjusting mechanism moves lengthwise.