Power tool

• US 4,427,042 A
• Filed: 05/13/1981
• Issued: 01/24/1984
• Est. Priority Date: 05/13/1981
• Status: Expired due to Term

• Current Assignee: Emerson Electric Company
• Original Assignee: Emerson Electric Company
• Inventors: Brundage, Richard B., Mitchell, Richard L., Palmer, John A.
• Primary Examiner(s): Bray, W. D.
• Application Number:
  US06/263,122
• Time in Patent Office: 986 Days
• Field of Search: 144/117 R, 144/285, 144/286 R, 144/2 R, 144/1 R, 144/3 R, 200/42 T, 200/334, 408/710
• US Class Current: 144/1.1
• CPC Class Codes: B23D 47/12 of drives for circular saw blades
• CPC Class Codes: B27C 9/02 with a single working spindle
• CPC Class Codes: Y10S 408/71 Safety device

Abstract

A dual power tool, such as a jointer/planer, is disclosed in which the cutting head of the tool is mounted on a common shaft which also serves as the rotor shaft for the tool drive motor. This dual power tool is mounted on a single stand and has a switch enabling only one tool at a time to be operated. A retrofit kit is disclosed for permitting a tool owner to convert a single power tool into a dual power tool.

Claims

1. A direct drive rotary tool, such as a jointer/planer or the like, comprising a unitary base, said base having a central axis extending generally transversely of the base, a rotary cutter rotatable about said central axis and being cuttingly engageable with a workpiece, and a direct drive motor for rotatably driving said cutter, said motor comprising a rotor assembly including a rotor body and rotor shaft extending endwise from the rotor body, said rotor shaft being coaxial with said central axis and being journaled by a pair of bearings carried by said base on opposite sides of said cutter, said rotor body being cantilevered by said bearings, said motor further comprising a stator including a core having a bore therethrough, said bore receiving said rotor body for rotation of the latter within said bore, said base further having means for mounting said core on said base with said bore being substantially coaxial with said central axis.

2. A direct drive tool as set forth in claim 1 wherein said base includes a pair of bearing pillows, one on each side of said cutter, for receiving a respective bearing, said pillows being generally coaxial with said central axis and said bearings journaling said rotor shaft.

3. A direct drive tool as set forth in claim 1 wherein said base further includes a stator mount integral therewith, said stator mount having an inner surface concentric with said central axis so that with said stator received in said stator mount and with said rotor shaft received in said bearings, said rotor body is substantially centered within said bore.

4. A direct drive tool as set forth in claim 3 wherein said stator core has a plurality of holes extending axially therethrough and wherein said tool further comprises a plurality of fasteners, one for each of said stator holes, for securely mounting said stator within said stator mount.

5. A direct drive tool as set forth in claim 3 further comprising an enclosure for said stator and rotor assembly installed on said stator mount.

6. A direct drive power tool as set forth in claim 5 further having table means along which said workpiece may be moved for cutting engagement with said cutter, a fence assembly extending generally perpendicular to the central axis above the level of said table means for guiding work past said cutter, said fence assembly including a fence, a shroud at least in part surrounding said motor enclosure, and means for adjustably mounting said fence relative to said shroud thereby to permit angling of the fence about a generally horizontal axis substantially perpendicular to said central axis relative to said table between a vertical position and an angled position with respect to said table thereby to permit the work to be cut by said cutter on a bevel.

7. A direct drive power tool as set forth in claim 6 wherein said shroud is movable in a horizontal direction relative to said stator mount in a direction generally parallel to said central axis.

8. A direct drive tool as set forth in claim 7 further including means for selectively locking said fence in either its perpendicular position or at any desired angled position relative to said table within a limited range.

9. A direct drive tool as set forth in claim 7 further comprising means for selectively locking said shroud at any desired position relative to said stator mount.

10. A direct drive power tool as set forth in claim 2 wherein said bearings are each anti-friction bearings having an outer race and an inner race, said outer race being so sized relative to said pillows as to have a press fit therewithin, and wherein said inner race has a bore for receiving said rotor shaft, the latter including means for positively preventing substantial axial movement of said rotor shaft with respect to said bearings.

11. A direct drive power tool as set forth in claim 10 further comprising a removable fastener for positively securing the outer race of the bearing adjacent said rotor body in fixed position relative to said base.

12. A rotary machine tool, such as a jointer/planer or the like, comprising a base, a table supported on said base, a rotary tool positioned relative to said table so as to shape a workpiece as the latter is moved on said table relative to said rotary tool, and a motor for driving said tool, said motor including a stator having a core with a bore extending longitudinally therethrough, a rotor centered within said bore and being rotatable about a central axis, said rotor having a shaft extending endwise from at least one end of said rotor, said shaft being coaxial with said central axis, said shaft having said rotary tool mounted thereon, said tool further comprising a pair of bearings spaced from one another on opposite sides of said tool for journaling said shaft relative to said base thereby to rotatably mount said tool relative to said base and to rotatably mount and to cantilever said rotor within said bore of said stator core.

13. A combination power tool assembly including a support stand, a first power tool mounted on said stand having a respective dedicated electric motor for driving said first power tool, a second power tool mounted on said stand having a respective dedicated electric motor for driving said second power tool, each of said motors having a respective power cord, and a selector switch having a power supply cord connected thereto which is adapted to be plugged into a source of electrical power, each of said motor power cords being connected to said selector switch, the latter having switch means selectively movable from an off positon in which both of said motors are de-energized to a first operable position in which said first power tool motor is energized and in which said second power tool motor is de-energized or to a second operable position in which said second power tool motor is energized and in which said first power tool motor is de-energized, and means cooperable with said switch means which when in a first position enables said switch means to be selectively moved from its off to its first operable position, and which when in a second position in said selector switch enables said switch means to be moved from its off to its second operable position.

14. A combination power tool assembly including a support stand, a first power tool mounted on said stand having a respective dedicated electric motor for driving said first power tool, a second power tool mounted on said stand having a respective dedicated electric motor for driving said second power tool, each of said motors having a respective power cord, and a selector switch having a power supply cord connected thereto which is adapted to be plugged into a source of electrical power, each of said motor power cords being connected to said selector switch, the latter having switch means selectively movable from an off positon in which both of said motors are de-energized to a first operable position in which said first power tool motor is energized and in which said second power tool motor is de-energized or to a second operable position in which said second power tool motor is energized and in which said first power tool motor is de-energized, and key means cooperable with said switch means which when installed in said selector switch in a first position enables said switch means to be selectively moved from its off to its first operable position, which when installed in a second position in said selector switch enables said switch means to be moved from its off to its second operable position, and which removed from said selector switch prevents energization of either of said power tool motors.

15. A combination power tool assembly as set forth in claim 14 wherein said key has indicia thereon so as to indicate which tool may be energized when said key is either in its first or second operable position.

16. A combination power tool assembly as set forth in claim 14 wherein one of said power tool motor power cords is provided with a male electrical plug and wherein said switch includes a female receptacle for reception of said male plug thereby to permit said one power cord to be readily connected to said switch.

17. In a power tool, such as a table saw or the like, having a dedicated electric motor for driving said power tool, a power cord for said dedicated motor, and a support stand comprising a plurality of legs and a base frame secured to said legs, said base frame comprising a pair of opposed end members, one at each end of said base frame, and a pair spaced apart side members, one at each side of said base frame, said power tool being secured to said base frame and being supported by said legs at a convenient working height, wherein the improvement comprises:

a retrofit kit for adapting said power tool and support stand from a single power tool to a dual power tool, said kit comprising a pair of retrofit side members for said base frame longer than said base member side members provided for said single tool support thereby to increase the size of said base frame, a second power tool mounted on said base frame proximate the first mentioned power tool, said second power tool having a respective dedicated electric motor for driving said second power tool, said motors for said first and second power tools each having a respective power cord, and switch means having a power supply cord adapted to be plugged into a source of electrical power, each of said motor power cords being connected to said switch, said switch having switch means selectively movable from an off position in which both of said motors are de-energized to a first operable position in which one of said power tool motors is energized and in which the other of said power tool motors is de-energized or to a second operable position in which said other power tool motor is energized and in which said one power tool motor is de-energized, and key means cooperable with said switch means which when installed in said switch means in a first position enables said switch means to be selectively moved from its off to its first operable position, which when installed in a second position enables said switch means to be moved from its off position to its second operable position, and which when removed from the switch means prevents energization of either of said power tool motors.