CONCENTRIC ASSEMBLY FOR PORTABLE ELECTRIC ROUTER
First Claim
1. A portable electric router for driving a bit comprising:
- a. a base having a cylindrical sleeve terminating in a bottom flange for work engaging, b. a cylindrical motor housing axially adjustably disposed within the sleeve, c. a motor having an armature shaft centrally journaled within the motor housing with one end of the shaft extending therefrom to carry the bit, d. a pad formed on one side internally of the sleeve and having a curved surface, the arc of which is set off from a radius substantially equal to the radius measured from the axis of the armature shaft to the outer periphery of the motor housing, and e. a clamping means adjustably extending through the sleeve on the side opposite the pad to force the motor housing against the pad to lock the motor housing in adjusted axial position and to place the motor housing in concentric position.
3 Assignments
0 Petitions
Accused Products
Abstract
A concentric assembly for a portable electric router having a base formed with a cylindrical sleeve terminating in a bottom flange for work engaging. A cylindrical motor housing is axially adjustably disposed within the sleeve. A motor is mounted within the motor housing and has an armature shaft centrally journaled therein. An arcuate pad is formed internally on one side of the sleeve with the arc of its surface set off from a radius substantially equal to the radius measured from the axis of the armature shaft to the outer periphery of the motor housing. A clamping means is connected through the sleeve on the side opposite the pad to force the motor housing against the pad to lock the same in adjusted axial position and to place the motor housing in concentric position. When the clamp is loosened, a rack and pinion mechanism connected between the motor housing and the sleeve can be used to axially position the motor housing to adjust the depth of cut of the router.
47 Citations
5 Claims
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1. A portable electric router for driving a bit comprising:
- a. a base having a cylindrical sleeve terminating in a bottom flange for work engaging, b. a cylindrical motor housing axially adjustably disposed within the sleeve, c. a motor having an armature shaft centrally journaled within the motor housing with one end of the shaft extending therefrom to carry the bit, d. a pad formed on one side internally of the sleeve and having a curved surface, the arc of which is set off from a radius substantially equal to the radius measured from the axis of the armature shaft to the outer periphery of the motor housing, and e. a clamping means adjustably extending through the sleeve on the side opposite the pad to force the motor housing against the pad to lock the motor housing in adjusted axial position and to place the motor housing in concentric position.
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2. The combination claimed in claim 1 wherein:
- a. the sleeve includes a pair of diametrically opposite recesses extending radially outwardly therefrom, b. the arcuate pad formed in a pair of pad sections on either side of one of the sleeve recesses, and c. the clamping means including a pressure bar disposed in the axial recess opposite the pads and a clamping screw threadedly extending through the sleeve to engage the bar whereby on turning of the clamping screw the bar will force the motor housing into contact with the pads to place the axis of the armature shaft concentric to the radial point of the pads.
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3. The combination claimed in claim 2 wherein:
- a. the pressure bar has a radial aperture adjacent to and smaller than the diameter of the clamping screw, b. a pin section of reduced diameter formed at the end of the clamping screw to extend through the radial aperture of the pressure bar, and c. the pin section longer than the width of the pressure bar by a few thousandths of an inch whereby upon the clamping screw being tightened against the pressure bar the pin section will extend by the few thousandths of an inch into direct contact with the motor housing to form an interference fit therewith.
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4. The combination claimed in claim 3 wherein:
- a. a pair of locator means connected through the sleeve to contact the pressure bar and permit radial movement thereof and prevent axial movement of the bar, and b. the locator means axially disposed on either side of the clamping screw.
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5. The combination claimed in claim 4 wherein:
- a. a rack is fixedly connected upon the motor housing in axial position to extend within the recess adjacent the pads, b. a pinion connected across the recess of the sleeve to engage the rack, and c. means connected to the pinion to rotate the same, whereby upon loosening of the clamping screw, the motor housing is axially raised or lowered into adjusted position prior to reclamping the screw.
Specification