| 摘要 |
<p>A caster assembly (10) mountable to a frame leg (18) of a movable frame structure having a caster receiving aperture therein. The caster assembly of a preferred embodiment includes a caster having a caster fork, a caster wheel (32) attached to the caster fork, and a mounting shaft attached to a caster fork. The mounting shaft (14) is shaped and sized to extend through the aperture in the frame portion when the caster assembly is in an installed position wherein the caster is adjacent to a bottom side of the frame leg and an intermediate portion of the mounting shaft is adjacent to a top side of the frame leg. The mounting shaft (14) has an generally flat blocking surface extending along a portion of the shaft such that the blocking surface is adjacent to the aperture in the frame leg when the caster is in the installed position. A locking washer is removably connected to the mounting shaft (16) and is mountable to the frame leg. The locking washer has a shaft aperture that receives the mounting shaft therein, and an engagement portion defines a portion of the shaft aperture. The blocking surface is removably positioned immediately adjacent to the engagement portion so as to engage the engagement portion and prevent rotational movement of the mounting shaft relative to the locking washer and relative to the frame leg when the caster is in the installed position. The locking washer (22) retains the mounting shaft (14) in a selected angular orientation relative to the frame leg (18) aligned with a primary intended direction of travel, thereby providing directional control of the frame structure.</p> |
