| 摘要 |
<p>AN IMPROVED ELEVATION SETTING MECHANISM FOR A TABLE SAW AND THE LIKE There is disclosed an elevation setting mechanism for a motordriven tool in a power tool apparatus such as a table saw. The table saw described includes a housing having a table top with an opening through which the motor-driven tool in the form of a saw blade can pass, and an assembly including a frame pivotally mounted in the housing about a first axis. Pivotally mounted in the frame about a second pivot axis is a first subassembly which includes the saw blade. Further, there is included a second subassembly pivotally mounted about the second pivot axis. The basic elevation setting mechanism includes a control lever operatively connected to the second subassembly for pivoting same, and means connecting the two subassemblies, such that they pivot in unison, in response to action of the control lever, for purposes of setting the tool at a coarse level. The mechanism further includes a second control mechanism operatively connected to the first subassembly for imparting additional pivotal movement thereto for effecting a vernier elevation adjustment of the saw blade. It is in this latter adjustable feature wherein the improvement of the invention lies. The invention is directed to a pivot nut pivotally mounted in the first subassembly, the pivot nut having a threaded opening perpendicular to its pivot axis in the first subassembly. A connecting rod includes a threaded end which is disposed and threadably engages a threaded opening in the pivot nut. Means are disclosed which restrain axial movement of the rod towards and away from the pivot axis of the pivot nut. When the connecting rod is rotated, the pivot nut is caused to translate with respect to the connecting rods and the pivotal mounting of the pivot nut converts the rotational movement of the rod into pivotal movement of the first sub-assembly about the second pivot axis whereby the further vernier elevation adjustment of the saw blade is effected.</p> |
