Electrically conductive roller fitment for wheelchair or bed has small roller of electrically conductive material mounted in interspace between pair of wheels and displaceable down to contact ground through compression spring

摘要

The roller fitment has a pair (1) of wheels (14) which are mounted spaced from one another to form an interspace in which an electrically conductive small roller (23) is mounted so that it can be pressed resiliently down. The small roller is made from an electrically conductive material and is mounted rotatable in a sheet metal U-shaped inner support (22) which is mounted vertically displaceable in the metal outer support (21) fixed in a holder (11). A compression spring (26) presses the inner support downwards.