US3857206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound motion rubbing machine
Assignee: NAT DETROIT Inc CO
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Filing: 1973-03-08
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Granted: 1974-12-31
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Expires: 1993-03-08
Abstract
Abstract A portable sander having an air motor with an output shaft driving an eccentric, parallel shaft on which an inverted cupshaped casing is journaled for eccentric motion about the driving shaft. A pinion gear is fast on the motor housing around the motor shaft and meshes with a larger ring gear fast in the upper end of the casing to rotate the casing about an eccentric axis as it moves about the axis of the driving shaft. The casing carries a rubbing shoe to which a sheet of sandpaper is attached for contact with a work surface.
Inventors
- 👤 E Heffran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:10
CPC Classifications
B; B24; B24B; B24B23/00; B24B23/02; B24B23/03
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
197 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame with one end portion projecting downwardly therefrom, an eccentric shaft mounted on the projecting end portion of said drive shaft in radially offset parallel relation therewith, an inverted cup-shaped casing disposed around said eccentric shaft and rotatably mounted thereon for gyratory motion about the axis of said drive shaft as the latter rotates, a pinion gear stationarily mounted on the underside of said frame in coaxial relation with said drive shaft, said casing having a coaxial annular rim loosely encircling said pinion gear, a ring gear larger than said pinion gear fast in said rim and disposed around the pinion gear in meshing engagement with one side of the latter, and a rubbing shoe mounted on the lower end of said casing for movement therewith in rubbing engagement with a work surface, the amount of eccentricity of said eccentric shaft and the sizes of said gears being correlated to produce simultaneous gyrating and rotating motion of said casing during rotation of said drive shaft and generally epicycloidal motion of abrasive particles on said shoe relative to a work surface.
Claim 2
Dependent Claim
197 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame with one end portion projecting downwardly therefrom, an eccentric shaft mounted on the projecting end portion of said drive shaft in radially offset parallel relation therewith, an inverted cup-shaped casing disposed around said eccentric shaft and rotatably mounted thereon for gyratory motion about the axis of said drive shaft as the latter rotates, a pinion gear stationarily mounted on the underside of said frame in coaxial relation with said drive shaft, said casing having a coaxial annular rim loosely encircling said pinion gear, a ring gear larger than said pinion gear fast in said rim and disposed around the pinion gear in meshing engagement with one side of the latter, and a rubbing shoe mounted on the lower end of said casing for movement therewith in rubbing engagement with a work surface, the amount of eccentricity of said eccentric shaft and the sizes of said gears being correlated to produce simultaneous gyrating and rotating motion of said casing during rotation of said drive shaft and generally epicycloidal motion of abrasive particles on said shoe relative to a work surface.
Claim 3
Dependent Claim
54 words
The combination defined in claim 1 further including a counterweight mounted on said eccentric shaft above said shoe and within said casing below said gears, the centers of gravity of said counterweight and the gyrating mass including said casing and said shoe being disposed generally in a common plane perpendicular to said eccentric shaft.
Claim 4
Dependent Claim
156 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame with one end portion projecting downwardly therefrom, an eccentric on the projecting end portion of said drive shaft, a hollow carrier disposed around said eccentric and rotatably mounted thereon for eccentric motion with the eccentric about the axis of said drive shaft, a pinion gear stationarily mounted on the underside of said frame in coaxial relation with said drive shaft, said carrier having an annular rim projecting upwardly beyond said eccentric in loosely telescoping relation with said pinion gear, a ring gear larger than said pinion gear mounted inside said rim and meshing with the pinion gear to roll around the latter during eccentric motion of said carrier and thereby rotate the carrier about said eccentric, and a rubbing shoe fast on the lower end of said carrier for compound motion in rubbing engagement with a work surface.
Claim 5
Dependent Claim
156 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame with one end portion projecting downwardly therefrom, an eccentric on the projecting end portion of said drive shaft, a hollow carrier disposed around said eccentric and rotatably mounted thereon for eccentric motion with the eccentric about the axis of said drive shaft, a pinion gear stationarily mounted on the underside of said frame in coaxial relation with said drive shaft, said carrier having an annular rim projecting upwardly beyond said eccentric in loosely telescoping relation with said pinion gear, a ring gear larger than said pinion gear mounted inside said rim and meshing with the pinion gear to roll around the latter during eccentric motion of said carrier and thereby rotate the carrier about said eccentric, and a rubbing shoe fast on the lower end of said carrier for compound motion in rubbing engagement with a work surface.
Claim 6
Dependent Claim
144 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame, a second shaft eccentrically carried by said drive shaft for eccentric motion about the axis thereof during rotation of the drive shaft, a cup-shaped casing rotatably mounted on said second shaft for eccentric motion therewith about said axis and simultaneous rotation about the axis of said second shaft, a pinion gear stationarily mounted on said frame in coaxial relation with said drive shaft, a ring gear internally larger than the exterior of said pinion gear mounted on said casing and disposed around the pinion gear for continuous rolling engagement therewith to rotate said casing about said second shaft during eccentric motion of the casing about said drive shaft, and a rubbing shoe carried by said casing for movement therewith in rubbing engagement with a work surface.
Claim 7
Dependent Claim
144 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame, a second shaft eccentrically carried by said drive shaft for eccentric motion about the axis thereof during rotation of the drive shaft, a cup-shaped casing rotatably mounted on said second shaft for eccentric motion therewith about said axis and simultaneous rotation about the axis of said second shaft, a pinion gear stationarily mounted on said frame in coaxial relation with said drive shaft, a ring gear internally larger than the exterior of said pinion gear mounted on said casing and disposed around the pinion gear for continuous rolling engagement therewith to rotate said casing about said second shaft during eccentric motion of the casing about said drive shaft, and a rubbing shoe carried by said casing for movement therewith in rubbing engagement with a work surface.
Claim 8
Dependent Claim
137 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame, a second shaft eccentrically carried by said drive shaft for eccentric motion about the axis thereof during rotation of the drive shaft, a gear wheel stationarily mounted on said frame in coaxial relation with said drive shaft, a ring gear internally larger than the exterior of said gear wheel rotatably mounted on said second shaft in coaxial relation therewith for eccentric motion about said axis, said ring gear being disposed around said gear wheel and in rolling engagement therewith to be turned by the gear wheel during said eccentric motion, and a rubbing shoe carried by said ring gear for simultaneous eccentric and turning movement relative to said frame whereby points on said shoe move along generally epicycloidal paths.
Claim 9
Dependent Claim
137 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame, a second shaft eccentrically carried by said drive shaft for eccentric motion about the axis thereof during rotation of the drive shaft, a gear wheel stationarily mounted on said frame in coaxial relation with said drive shaft, a ring gear internally larger than the exterior of said gear wheel rotatably mounted on said second shaft in coaxial relation therewith for eccentric motion about said axis, said ring gear being disposed around said gear wheel and in rolling engagement therewith to be turned by the gear wheel during said eccentric motion, and a rubbing shoe carried by said ring gear for simultaneous eccentric and turning movement relative to said frame whereby points on said shoe move along generally epicycloidal paths.
Claim 10
Dependent Claim
42 words
The combination defined in claim 5 in which said ring gear is mounted on a hollow casing having one end portion carrying said ring gear and its opposite end portion connected to said shoe, said casing being journaled on said second shaft.
Claim 11
Dependent Claim
63 words
The combination defined in claim 6 in which the center of gravity of the mass including said casing, said ring gear and said shoe is in a plane between said shoe and said ring gear, and further including a counterweight mounted on said second shaft within said casing and below said ring gear and having a center of gravity substantially in said plane.
Claim 12
Dependent Claim
25 words
The combination defined in claim 6 in which the end of said casing connected to said shoe is larger in diameter than said ring gear.
Claim 13
Dependent Claim
115 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame, an eccentric on said drive shaft, a carrier rotatably mounted on said eccentric for eccentric motion about the axis of said drive shaft during rotation of the latter, a wheel stationarily mounted on said frame in coaxial relation with said drive shaft, a ring internally larger than the exterior of said wheel disposed around the latter in continuous rolling engagement therewith, said ring being mounted on said carrier to rotate the latter as it moves eccentrically around said axis, and a rubbing shoe mounted on said carrier for movement therewith in rubbing engagement with a work surface.
Claim 14
Dependent Claim
115 words
In a compound motion rubbing machine, the combination of, a frame, a drive shaft journaled on said frame, an eccentric on said drive shaft, a carrier rotatably mounted on said eccentric for eccentric motion about the axis of said drive shaft during rotation of the latter, a wheel stationarily mounted on said frame in coaxial relation with said drive shaft, a ring internally larger than the exterior of said wheel disposed around the latter in continuous rolling engagement therewith, said ring being mounted on said carrier to rotate the latter as it moves eccentrically around said axis, and a rubbing shoe mounted on said carrier for movement therewith in rubbing engagement with a work surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |