Patent US4050487A successfully refreshed from Google Patents.
US4050487A
Expired / Lapsed
US
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Electric sharpener
Assignee: Mabuchi Motor Co Ltd
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Filing: 1975-12-18
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Granted: 1977-09-27
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Expires: 1995-12-18
Abstract
Abstract An electric sharpener is disclosed, wherein its sharpener section is driven by a motor powered from a self-contained battery in an arrangement that said motor and a reduction means for transmitting the revolving force of said motor to said sharpener section are housed in an inner case movable relative to an outer case in the lengthwise direction and the electrical connection between said self-contained battery and said motor is controlled by moving said inner case in said lengthwise direction with a pencil inserted into said sharpener section.
Inventors
- 👤 Kenichi Mabuchi
- 👤 Yoshihisa Tsuchimochi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:11
CPC Classifications
B; B43; B43L; B43L23/00; B43L23/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
An electric sharpener, comprising: a battery section a sharpener section; a battery powered motor; a reduction means having planetary gears for transmitting the output of said motor to said sharpener section; and a switch section located between said motor and the battery section; whereby said sharpener section, said motor, and said reduction means define a slidable body which can move in the axial direction so that said switch is controlled by said movement in the axial direction.
Claim 2
Dependent Claim
77 words
An electric sharpener, comprising: a battery section a sharpener section; a battery powered motor; a reduction means having planetary gears for transmitting the output of said motor to said sharpener section; and a switch section located between said motor and the battery section; whereby said sharpener section, said motor, and said reduction means define a slidable body which can move in the axial direction so that said switch is controlled by said movement in the axial direction.
Claim 3
Dependent Claim
36 words
An electric sharpener in claim 1, wherein said motor and said reduction means are housed in an inner case constructed to be movable relative to an outer case surrounding said inner case in the axial direction.
Claim 4
Dependent Claim
31 words
An electric sharpener in claim 2, wherein a ridge and a groove are provided to permit a relative movement in the axial direction between said outer case and said inner case.
Claim 5
Dependent Claim
56 words
An electric sharpener in claim 2, wherein the end face of said inner case facing said sharpener section is provided with a protruded member and a motor output shaft runs through said protruded member and the outer circumferent surface can slide against an opening in a partition wall between said sharpener section and said inner case.
Claim 6
Dependent Claim
37 words
An electric sharpener in claim 4, wherein a means is provided between said protruded member and said sharpener section for dispersing over said inner case a pushing force applied to said sharpener section in the axial direction.
Claim 7
Dependent Claim
62 words
An electric sharpener in claim (5), wherein said pushing force dispersion means consists of a retaining ring and a washer, both of which are run through by said motor output shaft, and application of a pushing force to said sharpener section in the axial direction will cause said retaining ring and said washer to push the end face of said protruded member.
Claim 8
Dependent Claim
16 words
An electric sharpener in claim (1), wherein said battery consists of one or more nickel-cadmium cells.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |