US4054164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pencil sharpener
Assignee: Resonac Corp
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Filing: 1976-10-14
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Granted: 1977-10-18
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Expires: 1996-10-14
Abstract
Abstract A pencil sharpener of a rotary type including a rotary blade having spiral cutting edges and a blade holder, wherein the rotary blades makes a rotation around its own axis while making a revolution around a rotational axis of the assembly of the rotary blade and the blade holder by a cooperation of a pinion carried by the rotary blade and a fixed annular internal gear, wherein a cover means is provided to isolate the meshing region of the pinion and the annular internal gear from the shaving region effected by the spiral cutting edges.
Inventors
- 👤 Ryoji Kose
- 👤 Syoichi Saito
- 👤 Masahito Ogiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:30
CPC Classifications
B; B43; B43L; B43L23/00; B43L23/008
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A pencil sharpener comprising: a frame; rotary blade including a cylindrical portion having spiral cutting edges and a pinion co-axially provided at one end of said cylindrical portion; a blade holder which rotatably supports said rotary blade and defines a conical cavity for receiving an end of a pencil therein; said blade holder being supported by said frame to be rotatable around the axis of said conical cavity; an annular internal gear fixedly supported by said frame and meshing with said pinion; a drive shaft which drives said blade holder around said axis; and a cover means supported by said blade holder to be rotatable therewith; said cover means traversing said blade holder and said rotary blade thereby isolating the meshing region of said pinion and said annular internal gear from said conical cavity.
Claim 2
Dependent Claim
134 words
A pencil sharpener comprising: a frame; rotary blade including a cylindrical portion having spiral cutting edges and a pinion co-axially provided at one end of said cylindrical portion; a blade holder which rotatably supports said rotary blade and defines a conical cavity for receiving an end of a pencil therein; said blade holder being supported by said frame to be rotatable around the axis of said conical cavity; an annular internal gear fixedly supported by said frame and meshing with said pinion; a drive shaft which drives said blade holder around said axis; and a cover means supported by said blade holder to be rotatable therewith; said cover means traversing said blade holder and said rotary blade thereby isolating the meshing region of said pinion and said annular internal gear from said conical cavity.
Claim 3
Dependent Claim
76 words
The pencil sharpener of claim 1, wherein said cover means is a cup-shaped member having cylindrical side wall and oblique end wall, said side wall engaging over said annular internal gear with a small clearance left therebetween, said end wall having first and second openings, said first opening fixedly receiving a portion of said blade holder, whereas said second opening rotatably receives said rotary blade at the portion between said spiral cutting edges and said pinion.
Claim 4
Dependent Claim
32 words
The pencil sharpener of claim 2, wherein said cover means is made of two halves which are joined together along a joint which passes the centers of said first and second openings.
Claim 5
Dependent Claim
22 words
The pencil sharpener of claim 3, wherein said joint incorporates a ridge and groove formed at different halves of said cover means.
References Cited (Backward Citations)
DE2225069A1
Cited
US3991798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |