| 摘要 |
<p>17heavy duty expansible junction-box hanger assembly (18) adapted for installation from beneath a ceiling through a junction-box aperture (26) in the ceiling (24) without complete prior removal of a previously installed light-weight hanger assembly (28). The portion of the light-weight hanger (28) directly above the aperture (26) is cut away, and the heavy duty hanger (18) is maneuvered through the aperture (26) to a position above the light-weight hanger (28) and rest on the upper ceiling surface (24), after which joist engagement means (30, 32) on the hanger assembly (18) are expanded into biting contact with the joists (20, 22). </p> |
