Patent US3667516A successfully refreshed from Google Patents.
US3667516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sharpening leads for pencils or the like
Assignee: Individual
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Filing: 1970-03-27
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Granted: 1972-06-06
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Expires: 1990-03-27
Abstract
Abstract A disposable, expendable sharpener for leads and a drive for manipulating and rotating the sharpener are provided. The sharpener includes a bottom wall, side wall, and central truncated cone or hub which are integrally formed of foamed plastic material. A top is provided for the sharpener with an opening for access to a truncated conical abrasive surface in the sharpener. A flexible lip extends from an edge of the top toward the abrasive surface to urge a lead inserted in the opening against the surface. The lip tends to enclose the sharpener to restrict spreading of graphite powder therefrom and also wipes graphite powder from the lead when being sharpened and when removed. The drive for the sharpener includes a gear arrangement which causes the sharpener to move in a circular path and, at the same time, to rotate about its own axis, with a vertical line through the conical abrasive surface of the sharpener being stationary. This line represents the position at which the lead is inserted for sharpening, which is accomplished without need for rotating or otherwise manipulating the lead.
Inventors
- 👤 Robert M Grosjean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:42
CPC Classifications
B; B43; B43L; B43L23/00; B43L23/006
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
85 words
A device for sharpening points of leads comprising a container having a bottom wall, a side wall, a central, upwardly extending hub, an abrasive surface, and a top having a circular edge extending toward said abrasive surface with the center of the circular edge aligned with the axis of the hub, means forming a resilient lip extending beyond said circular edge toward said abrasive surface, said lip being effective to engage a lead inserted in said container to urge the lead toward said abrasive surface.
Claim 2
Independent Claim
85 words
A device for sharpening points of leads comprising a container having a bottom wall, a side wall, a central, upwardly extending hub, an abrasive surface, and a top having a circular edge extending toward said abrasive surface with the center of the circular edge aligned with the axis of the hub, means forming a resilient lip extending beyond said circular edge toward said abrasive surface, said lip being effective to engage a lead inserted in said container to urge the lead toward said abrasive surface.
Claim 3
Dependent Claim
33 words
A device according to claim 1 wherein said bottom wall, side wall, hub, and top of said container are made of inexpensive plastic material, whereby said container can be thrown away when desired.
Claim 4
Dependent Claim
18 words
A device according to claim 1 characterized by said bottom wall, side wall, and hub being integrally formed.
Claim 5
Dependent Claim
27 words
A device according to claim 1 characterized by a shaft extending beyond said bottom wall of said container and being aligned with the axis of said hub.
Claim 6
Dependent Claim
26 words
A device according to claim 1 characterized by said abrasive surface being formed by a separate truncated conical sheet of sand paper positioned on said hub.
Claim 7
Dependent Claim
22 words
A device according to claim 5 characterized by a layer of resilient material disposed between said hub and said sand paper sheet.
Claim 8
Dependent Claim
28 words
A device according to claim 1 characterized by said abrasive surface being formed by a separate sheet of sand paper positioned on said side wall of said container.
Claim 9
Independent Claim
80 words
A device for sharpening leads comprising a container having a bottom wall, a side wall, a central, upwardly extending hub, an upwardly extending abrasive surface, and a top extending toward said abrasive surface in close proximity therewith, said top having an edge terminating short of said abrasive surface to enable a lead to be inserted therebetween, said bottom wall, said hub and said side wall being made of inexpensive, disposable material whereby said device can be thrown away after use.
Claim 10
Independent Claim
80 words
A device for sharpening leads comprising a container having a bottom wall, a side wall, a central, upwardly extending hub, an upwardly extending abrasive surface, and a top extending toward said abrasive surface in close proximity therewith, said top having an edge terminating short of said abrasive surface to enable a lead to be inserted therebetween, said bottom wall, said hub and said side wall being made of inexpensive, disposable material whereby said device can be thrown away after use.
Claim 11
Dependent Claim
25 words
A device according to claim 8 characterized further by a resilient annular lip extending beyond the edge of said top and toward said abrasive surface.
Claim 12
Dependent Claim
19 words
A device according to claim 9 characterized by said resilient annular lip being in contact with said abrasive surface.
Claim 13
Dependent Claim
38 words
A device according to claim 8 characterized by said abrasive surface being on said hub, said top being affixed to the upper edge of said side wall, and extending inwardly to a circular edge concentric with said hub.
Claim 14
Dependent Claim
39 words
A device according to claim 8 characterized further by said abrasive surface being on the inner surface of said side wall, said top being supported on said hub and said edge being circular and concentric with said side wall.
Claim 15
Dependent Claim
44 words
A device according to claim 12 characterized further by a rotatable guiding member having an opening positioned above said abrasive surface to receive a lead, and having a shaft extending downwardly therefrom, said shaft being rotatably carried in said hub, in axial alignment therewith.
Claim 16
Dependent Claim
36 words
A device according to claim 8 characterized by a shaft affixed in said hub and extending downwardly below the bottom wall of said container, said shaft being in coaxial alignment with the axis of said hub.
Claim 17
Dependent Claim
134 words
Apparatus for sharpening points of leads comprising a receptacle having an abrasive surface with a circular cross section, a first shaft extending downwardly from said receptacle and aligned with the axis of said surface, an arm rotatably carrying said shaft and extending transversely thereto, a first gear affixed to said shaft, a drive shaft affixed to said arm and spaced from and parallel to said first shaft, means for driving said drive shaft, a second gear positioned coaxially with respect to said drive shaft and meshing with said first gear, said drive shaft rotating said arm and moving said first gear around said second gear to move said first shaft in a circular path around the center of said drive shaft and to cause said first shaft simultaneously to rotate on its own axis.
Claim 18
Dependent Claim
134 words
Apparatus for sharpening points of leads comprising a receptacle having an abrasive surface with a circular cross section, a first shaft extending downwardly from said receptacle and aligned with the axis of said surface, an arm rotatably carrying said shaft and extending transversely thereto, a first gear affixed to said shaft, a drive shaft affixed to said arm and spaced from and parallel to said first shaft, means for driving said drive shaft, a second gear positioned coaxially with respect to said drive shaft and meshing with said first gear, said drive shaft rotating said arm and moving said first gear around said second gear to move said first shaft in a circular path around the center of said drive shaft and to cause said first shaft simultaneously to rotate on its own axis.
Claim 19
Dependent Claim
32 words
Apparatus according to claim 15 characterized by the distance between said first and said drive shafts being equal to the distance between said first shaft and a portion of saId abrasive surface.
Claim 20
Dependent Claim
63 words
Apparatus for sharpening points of leads comprising a receptacle having a tapered abrasive surface of circular transverse cross section, a shaft extending downwardly from said receptacle and aligned with an axis of said surface, means for rotating said shaft, and means engageable with said shaft for moving said receptacle in a circular path, the center of which extends through said conical abrasive surface.
Claim 21
Dependent Claim
63 words
Apparatus for sharpening points of leads comprising a receptacle having a tapered abrasive surface of circular transverse cross section, a shaft extending downwardly from said receptacle and aligned with an axis of said surface, means for rotating said shaft, and means engageable with said shaft for moving said receptacle in a circular path, the center of which extends through said conical abrasive surface.
Claim 22
Dependent Claim
44 words
Apparatus according to claim 17 characterized by said means for moving said receptacle in a circular path comprises an arm rotatably connected to said shaft, and a drive shaft located at the center of the path and affixed to said arm for moving same.
Claim 23
Dependent Claim
54 words
Apparatus according to claim 17 characterized by said means for rotating said shaft comprises a gear affixed to said shaft, and a stationary gear having a center at the center of the circular path of said receptacle and engageable with said gear at all times as the receptacle is moved in its circular path.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |