US 4,599,927 AGranted

Tool elevation and bevel adjustment for direct drive power tool

AssigneeEmerson Electric Co.

InventorsCurtis J. Eccardt, Arnold L. Smith

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Abstract

A tool elevation and bevel adjustment machanism for a direct drive power tool (e.g., a direct drive table saw) is disclosed in which the power tool's drive motor is mounted on a plate which is pivotally suspended below the work table of the power tool. A working tool (e.g., a circular saw blade) is mounted on the rotor shaft of the motor. The plate with the motor mounted thereon is selectively pivotal with respect to the work table by means of a screw linkage such that the plate, together with the tool, may be selectively adjusted with respect to the table such that the tool is either perpendicular to the work table or is at a desired bevel angle with respect to the work table. Additionally, the motor is pivotally mounted on the plate for arcuate movement with respect to the plate. An elevation adjustment screw linkage is provided for effecting arcuate movement of the motor with respect to the plate, which in turn effects changes in elevation of the tool with respect to the work table, regardless of its bevel angle with respect to the work table.

Claims8

Dependent claims

In a direct drive power tool having a table, a base supporting said table, an electric motor including a rotor shaft, and a tool secured to and rotatable with said rotor shaft, wherein the improvement comprises:

means carried by said table for mounting said motor thereto and means for selectively adjusting the elevation of said motor and said tool carried by said rotor shaft relative to said table, said mounting means comprising a cradle plate secured to the bottom of said table, said cradle plate having a pivot aperture therein, said motor being pivotally mounted on said cradle plate for pivotal movement of said motor relative to said cradle plate about said pivot aperture, said elevation adjustment means comprising a manually adjustable elevation screw drive for effecting said pivotal movement of said motor about said pivot aperture thereby to elevate said rotor shaft carrying said tool toward and away from said table, a link having its inner end pivotally secured to said motor at a point distal from the mounting of said motor with respect to said pivotal aperture, an abutment carried by said cradle plate, said elevation drive screw extending through said abutment, means for transferring thrust loads between said elevation drive screw and said abutment, a handle for manually rotating said elevation drive screw, and a trunnion nut threadably engageable with said elevation drive screw and being pivotally secured with respect to said link for permitting relative pivotal movement between said elevation drive screw and said link about an axis generally perpendicular with respect to the axis of said elevation drive screw, said link having a pair of spaced trunnion openings therein for receiving portions of said trunnion nut, said trunnion nut comprising first and second trunnion parts, each of said trunnion parts having an inner surface having threads therein engageable with said elevation drive screw, and an outer surface including a trunnion received in a respective said trunnion opening in a respective said trunnion opening in said link, and means for securing said trunnion parts together such that the threads on said inner surfaces of said trunnion parts threadably engage said elevation drive screw.

In a direct drive power tool having a work table, a base supporting said table, an electric motor including a rotor shaft, and a tool secured to and rotatable with said rotor shaft, wherein the improvement comprises:

means carried by said work table for mounting said motor thereon and means for selectively adjusting the elevation of said motor and said tool carried by said rotor shaft relative to said work table, said mounting means comprising a cradle plate secured to the bottom of said table, said cradle plate having a pivot aperture therein, said motor being pivotally mounted on said cradle plate so as to effect pivotal movement of said motor about said pivot aperture, said elevation adjustment means comprising a manually adjustable elevation screw drive for effecting pivotal movement of said motor about said pivot aperture thereby to elevate said rotor shaft carrying said tool toward and away from said work table, a channel-shaped link having its inner end pivotally secured to said motor at a point distal from the mounting of said motor with respect to said pivotal aperture, an abutment carried by said cradle plate, said elevation drive screw extending through said abutment, means for transferring thrust loads between said elevation drive screw and said abutment, a handle for manually rotating said elevation drive screw, and an elevation trunnion nut threadably engageable with said elevation drive screw and being pivotally secured with respect to said link for permitting relative pivotal movement between said drive screw and said link about an axis generally perpendicular with respect to the axis of said elevation drive screw, said improvement further comprising means for the selective adjustment of the bevel angle of said tool with respect to said work table, said tool bevel angle adjustment means comprising means for pivotally mounting said cradle plate with respect to said table for pivotal movement about a pivot axis generally parallel to said table, and selectively operable means for effecting pivotal movement of said cradle plate and said motor mounted thereon for varying the bevel angle of said tool with respect to said table.

Dependencies are inferred from the claim text.

Facts

Application: 06/731,732Filed 8 May 1985
Granted: 15 Jul 1986
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B23D 45/068
With a circular saw blade arranged underneath a stationary work-table: the saw blade being adjustable according to depth or angle of cut
Y10T 83/7705
Supporting surface and tool axis angularly related: adjustable angular relationship
Y10T 83/7726
Support and tool relatively adjustable: by movement of the tool
Y10T 83/773
With means to support work relative to tool[s]: work-support includes passageway for tool [e.g., slotted table]