US3880530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing utensil
Assignee: Faber Castell AG
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Filing: 1973-08-14
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Granted: 1975-04-29
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Expires: 1993-08-14
Abstract
Abstract A barrel is provided with an elongated inner chamber having opposite open ends, and a pusher member is slidably accommodated with axial clearance in this chamber, having a portion which extends outwardly through one of these ends. The pusher member is thus slidable toward the other open end by inward pressure upon the aforementioned portion. The pusher member is formed with an axial passage which is open in direction toward the other end, and biasing means permanently opposes the sliding of the pusher member towards the other end. An abutment in the chamber is located adjacent the other end forwardly of the pusher member, and at least one elastically deformable washer, configurated either analogously to a Belleville spring or analogously to a spring washer, is accommodated in the chamber intermediate the abutment and the pusher member. The washer has a center aperture in registry with the passage of the pusher member so that a lead or the like can be received in this passage and in this aperture and extend outwardly through the other open end of the barrel.
Inventors
- 👤 Otto Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:38
CPC Classifications
B; B43; B43K; B43K21/00; B43K21/02; B43K21/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
240 words
In a writing utensil, a combination comprising a barrel having an elongated inner chamber and opposite open ends; a pusher member slidably accommodated with axial clearance in said chamber and having a portion extending outwardly through one of said ends, so that the pusher member is slidable toward the other end by inward pressure upon said portion, said pusher member having an axial passage which is open in direction toward said other end; biasing means permanently opposing the sliding of said pusher member toward said other end; an abutment in said chamber adjacent said other end and forwardly of said pusher member; and at least one elastically deformable dished spring washer accommodated in said chamber intermediate said abutment and said pusher member, said washer having a side facing said pusher member, an outer circumferential edge face, a center aperture in registry with said passage and bounded by an inner circumferential edge face both of said edge faces being normally inclined to the axis of said aperture, so that an elongated rodshaped scribing member can be received in said passage and aperture and can extend outwardly through said other end with said inner circumferential edge face frictionally engaging said scribing member, an outer annular collar projecting toward said pusher member in the region inwardly adjacent said outer circumferential edge face, and an inner annular collar projecting away from said pusher member in the region outwardly adjacent said inner circumferential edge face.
Claim 2
Dependent Claim
240 words
In a writing utensil, a combination comprising a barrel having an elongated inner chamber and opposite open ends; a pusher member slidably accommodated with axial clearance in said chamber and having a portion extending outwardly through one of said ends, so that the pusher member is slidable toward the other end by inward pressure upon said portion, said pusher member having an axial passage which is open in direction toward said other end; biasing means permanently opposing the sliding of said pusher member toward said other end; an abutment in said chamber adjacent said other end and forwardly of said pusher member; and at least one elastically deformable dished spring washer accommodated in said chamber intermediate said abutment and said pusher member, said washer having a side facing said pusher member, an outer circumferential edge face, a center aperture in registry with said passage and bounded by an inner circumferential edge face both of said edge faces being normally inclined to the axis of said aperture, so that an elongated rodshaped scribing member can be received in said passage and aperture and can extend outwardly through said other end with said inner circumferential edge face frictionally engaging said scribing member, an outer annular collar projecting toward said pusher member in the region inwardly adjacent said outer circumferential edge face, and an inner annular collar projecting away from said pusher member in the region outwardly adjacent said inner circumferential edge face.
Claim 3
Dependent Claim
28 words
A combination as defined in claim 1, wherein said washer is provided with slots extending from said inner towards said outer circumferential edge face of said spring washer.
Claim 4
Dependent Claim
20 words
A combination as defined in claim 1, wherein said side of said washer facing toward said pusher member is concave.
Claim 5
Dependent Claim
38 words
A combination as defined in claim 1; and further comprising additional ones of said washer, similar to the first-mentioned one and axially adjacent the same so as to form with the same and with one another a stack.
Claim 6
Dependent Claim
45 words
A combination as defined in claim 1, said biasing means being a helical spring; and further comprising a spacer sleeve slidably accommodated in said chamber between said washer and said helical spring, said spacer sleeve having a center opening in axial alignment with said aperture.
Claim 7
Dependent Claim
27 words
A combination as defined in claim 1, wherein said dished spring is formed with circumferentially distributed slots extending from said inner toward said outer circumferential edge face.
Claim 8
Dependent Claim
51 words
A combination as defined in claim 1, wherein said biasing means is a helical expansion spring surrounding said pusher member intermediate sAid portion and said washer; and further comprising a sleeve slidably surrounding said pusher member intermediate and bearing with its opposite ends upon said washer and said helical expansion spring.
Claim 9
Dependent Claim
75 words
A combination as defined in claim 1, said washer being deformable from less conical into more conical condition in response to application of axial stress; and wherein the diameter of said aperture bounded by said inner circumferential edge face is substantially equal to the outer diameter of the scribing member when said washer is in said less conical condition, and is greater than said outer diameter when said washer is in said more conical condition.
References Cited (Backward Citations)
US2358091A
Cited
US2486663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |