Patent ID: 8899544

Claim:
A hold-down apparatus for holding an associated cable tray on an associated support rod member, the cable tray being of the type having a pair of generally parallel rails with flanges extending lengthwise of the rails and being adapted to bear on the support rod member with the flanges defining an elongate bead extending lengthwise of the flanges, the hold-down apparatus comprising: a main body portion; an expansion clamp portion carried by the main body portion, the expansion clamp portion having a generally downwardly directed U-shaped configuration and being configured to selectively loosely engage and slidably hold the associated bead of the associated cable tray relative to the associated support rod member; and a fixed clamp portion carried by the main body portion, the fixed clamp portion having a generally downwardly directed U-shaped configuration and being configured to selectively tightly engage and tightly hold the associated bead and flange of the associated cable tray relative to the associated support rod member; wherein the main body portion comprises a substantially planar main central body portion defining on opposite sides thereof a top surface and a bottom surface; wherein the expansion clamp portion comprises a first inner shoulder defined by the main body portion, a first arm beam member extending outwardly from the main body portion, a downwardly directed first hook member carried on a distal end of the first arm beam member, and a first outer shoulder defined by a portion of the first hook member directed towards the first inner shoulder, wherein the first arm beam member defines a substantially planar first roof surface disposed a predetermined distance from one of the flat top surface or the flat bottom surface of the main central body portion; wherein the fixed clamp portion comprises a second inner shoulder defined by the main body portion, a second arm beam member extending outward from the main body portion, a downwardly directed second hook member carried on a distal end of the second arm beam member, and a second outer shoulder defined by a portion of the second hook member directed towards the second inner shoulder, wherein the second arm beam member defines a substantially planar second roof surface disposed a predetermined distance from one of the flat top surface or the flat bottom surface of the main central body portion.