| 摘要 |
The orbital sander of the present invention eliminates many of the disadvantages of the prior art sanders by providing a compact, lightweight, and economical sander having a body and shroud formed from an injection-molded synthetic polymeric material. The head is replaced using a built-in plunger which engages notches in the spindle, without the need for tools. The built-in plunger enables the flexible shroud of the prior art to be replaced with a rigid polymeric shroud positioned with a minimal gap between the shroud and the head or shoe. The polymeric shroud is attached to the rest of the polymeric body structure by three screws and two pins. The pins project upwardly from the polymeric shroud and into precise engagement with the polymeric body structure, thus reducing the required drilling and tapping, providing rotational stability, and increasing the strength of the connection between the two parts. The air control valve is securely held in the housing using a set screw having a dog which engages a groove in the air control valve to resist the axial force tending to eject the air control valve from the body structure. Finally, a new muffler is used which creates a circuitous path for the exiting air, and thus dampens its acoustic energy.
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