US 5,402,604 AGranted

Oscillating spindle sander

AssigneeRyobi Motor Products Corp.

InventorsToshimitsu Hashii, Robert G. Everts

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Abstract

An oscillating spindle sander having a spindle rotatably mounted in a cabinet. An external end of the spindle is adapted to receive a sanding drum. An upper cam pulley is fixedly attached to the spindle and a lower cam pulley is rotatably attached to the spindle within the cabinet. The upper and lower cam pulleys have face-to-face annular cam surfaces having complementary sinusoidal contours with diametrically opposite lobes and diametrically opposite valleys. The upper and lower cam pulleys have a toothed rim connected by individual drive belts to a common drive pulley rotated by an electric motor. The number of teeth on the toothed rims of the upper and lower cam pulleys are different, causing the upper and lower cam pulleys to rotate relative to each other. The annular cam surfaces cause the upper cam pulley and the spindle to be oscillated in a vertical direction in response to the relative rotation between upper and lower cam pulleys.

Claims21

Dependent claims

An oscillating spindle sander comprising:

a cabinet having a substantially horizontal work table;
a spindle oriented normal to said work table rotatably mounted in said cabinet, said spindle having an external portion extending from said work table, said external portion having means for mounting a sanding drum thereon;
a first cam pulley fixedly attached to said spindle, said first cam pulley having a toothed rim and a cam surface, said toothed rim having a first number of teeth;
a second cam pulley rotatably attached to said spindle, said second cam pulley having a peripheral rim and a cam surface engaging said cam surface of said first cam pulley, said toothed rim having a second number of teeth different from said first number of teeth;
an electric motor mounted within said cabinet adjacent to said first cam pulley and said second cam pulley, said motor having a rotary output;
a first toothed pulley belt connecting said first cam pulley to said rotary output;
a second toothed belt connecting said second cam pulley to said rotary output;
and
means for resiliently biasing said annular cam surface of said first cam pulley into engagement with said annular cam surface of said second cam pulley.

6 more elements

An oscillating spindle sander having a spindle displaceable in a vertical direction, a sanding drum attached to said spindle and an electric motor for rotatably producing a rotary output, a mechanism for oscillating said spindle in an axial direction, comprising;

an first cam pulley attached to said spindle and rotatable therewith, said first cam pulley having an annular cam surface and a toothed rim having a first number of teeth;
a second cam pulley rotatably connected to said spindle adjacent said first cam pulley, said second cam pulley having an annular cam surface which is engaged by said annular cam surface of said first cam pulley and a toothed rim having a second number of teeth different from said first number of teeth;
an elongated drive pulley attached to said rotary output of said electric motor, said drive pulley having a third number of teeth;
a first pulley belt connecting said drive pulley to said toothed rim of said first cam pulley causing said first cam pulley to rotate at a first rate in response to the rotation of said drive pulley;
and
a second pulley belt connecting said drive pulley to said toothed rim of said second cam pulley to rotate said second cam pulley at a second rate different from said first rate, in response to the rotation of said drive pulley, said annular cam surfaces of said first and second cam pulleys rotate at different rates and produce an oscillatory motion of said first cam pulley, said spindle and said sanding drum in said axial direction.

3 more elements

Dependencies are inferred from the claim text.