| 摘要 |
A support device includes a head, a lock nut threaded to the head and having a peripheral flange, and a control ferrule having a peripheral rib engaged with the peripheral flange of the lock nut, to rotatably attach the control ferrule to the head with the lock nut. A coupler includes a shank, and an arm secured to the shank and attached to a frame device, a rod is extended from the shank and engageable through the lock nut and into the head. One or more fasteners may secure the shank to the frame device. The shank is threaded to the control ferrule, to secure the shank and the frame device to the head, and the fastener is received and shielded within the control ferrule.
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