US3595285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motorized drawing lead sharpener
Assignee: Individual
•
Filing: 1969-05-08
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Granted: 1971-07-27
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Expires: 1989-05-08
Abstract
Abstract A motorized drawing lead sharpener used in conjunction with mechanical type lead pencils, such as used by engineers and draftsmen. Said sharpener includes a cutting assembly, wherein the cutting blades of the assembly are adjustable to provide the necessary tapered point for a particular form of drafting. Said assembly is rotatably driven by a motor.
Inventors
- 👤 Raymond R Ruben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:19
CPC Classifications
B; B43; B43L; B43L23/00; B43L23/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
An electrical pencil sharpener adapted to sharpen drawing lead comprising: a housing having a supporting structure and a removable cover; a motor supported within said supporting structure; a cutting assembly including a plurality of adjustable cutting blades; a pivot pin for pivoting each of said cutting blades within said cutting assembly; a blade adjusting means slidably positioned on said cutting assembly whereby said cutting blades may be adjusted to various cutting positions; and a biasing means for rotating said cutting blades about said pivot pins to a limited degree in one direction and wherein said blade-adjusting means comprises a snap ring slidably adjustable along the vertical axis of said cutting assembly for limiting the rotation of said biased cutting blades.
Claim 2
Dependent Claim
120 words
An electrical pencil sharpener adapted to sharpen drawing lead comprising: a housing having a supporting structure and a removable cover; a motor supported within said supporting structure; a cutting assembly including a plurality of adjustable cutting blades; a pivot pin for pivoting each of said cutting blades within said cutting assembly; a blade adjusting means slidably positioned on said cutting assembly whereby said cutting blades may be adjusted to various cutting positions; and a biasing means for rotating said cutting blades about said pivot pins to a limited degree in one direction and wherein said blade-adjusting means comprises a snap ring slidably adjustable along the vertical axis of said cutting assembly for limiting the rotation of said biased cutting blades.
Claim 3
Dependent Claim
31 words
An apparatus as recited in claim 1, including a disc shaped member having an internal radial groove to accommodate said snap ring for selectively positioning said ring about said cutting assembly.
Claim 4
Dependent Claim
41 words
An apparatus as recited in claim 2, wherein said cutting assembly comprises: a cutting head, said head having an outer circular wall; a plurality of radially extending slots equally spaced vertically about said wall and adapted to receive said cutting blades.
Claim 5
Dependent Claim
44 words
An apparatus as recited in claim 3, including a plurality of external grooves transversely spaced from each other along the outer surface of said circular wall of said cutting head, whereby each of said grooves will accommodate the selective positioning of said snap ring.
Claim 6
Dependent Claim
49 words
An apparatus as recited in claim 3, including an advancing lever means, said means being pivotally connected to said support structure and having free ends movably engaged with said disc-shaped member, whereby adjustment of said disc member is positioned on said cutting head by movement of said lever means.
Claim 7
Dependent Claim
31 words
An apparatus as recited in claim 5, including a turret slidably supported on said supporting structure and having a retaining means for retaining said pencil in alignment with said cutting blades.
Claim 8
Dependent Claim
45 words
An apparatus as recited in claim 6, wherein said turret comprises: a plurality of clips secured in complimentary apertures located about the periphery of said turret, whereby said clips releasably hold said pencils; and a biasing means for biasing said turret into an inactive position.
Claim 9
Dependent Claim
62 words
An apparatus as recited in claim 7, including a splined shaft secured to said supporting structure and adapted to slidably support said turret; and a latch disposed in said turret for selectively engaging said splined shaft whereby said pencil held in said clip may be selectively positioned so that said drawing lead to be sharpened may be received in said cutting head.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |