Abstract: A multistage adjustable support assembly includes a connecting sleeve axially formed with an axial hole, which is formed with at least one internal threaded portion, an adjustable threaded post received in the axial hole, peripherally formed with at least one first threaded portion for being screwedly coupled with the internal threaded portion, and axially formed with a through hole that is provided therein with at least one second threaded portion, and a support axially extended upward with a rotatable threaded post that is peripherally formed with at least one external threaded portion for being screwedly coupled with and movable along the through hole. The first threaded portion has a thread pitch greater than a thread pitch of the second threaded portion. The multistage adjustable support assembly allows both fine and coarse altitude adjustments an external article it supports with respect to the support.

Abstract: A dust cover plate for a linear motor is provided. The linear motor has a machine base mounted with a guideway set that carries a sliding block to slide therealong, a stator being settled at one side of the machine base, and a mover including a mover base connected to the sliding block and a block mover core facing the stator. Therein, an accommodating space exists between the mover base and the mover core for receiving the dust cover plate. The dust cover plate has one side fixed to the guideway and extending over the stator and the mover core to prevent external dust or particles from falling between the mover and the stator.