US3765781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical pencil
Assignee: Mitsubishi Pencil Co Ltd
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Filing: 1971-01-22
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Granted: 1973-10-16
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Expires: 1991-01-22
Abstract
Abstract In an mechanical pencil having a cap nozzle at one end of a body casing and a cap means at the opposite end thereof, a lead carrying mechanism is retractably arranged within the cap nozzle and selectively operated by a mechanism operative with resilient means provided in the body casing so that in accordance with wear of the lead said lead carrying mechanism is gradually retracted into the body casing under the writing pressure.
Inventors
- 👤 S Torii
- 👤 Y Hashimoto
- 👤 O Torii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:34
CPC Classifications
B; B43; B43K; B43K21/00; B43K21/02; B43K21/16; B43K21/027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A pencil comprising a tubular elongated casing, relatively movable cooperating means within said casing for releasably clutching lead adapted to be fed from within said casing to a point outwardly at one end thereof, manually operable means at the opposite end of the casing, second cooperating means operatively connected with said manually operable means and with said relatively movable cooperating means for operating the latter under control of said manually operable means, a hollow cap nozzle at one end of the casing and terminating in an opening, a freely suspended hollow slider within said hollow cap nozzle, said slider having a first position contiguous to an internal end wall of the cap nozzle and a second position spaced from said end wall, a tubular member fixed at one end thereof to said slider for movement therewith and having an opposite end which projects through said opening in said cap nozzle when lead is clutched by said relatively movable cooperating means, and means providing guided movement of said slider when moving from its first position to its second position as an incidence of a writing operation.
Claim 2
Dependent Claim
185 words
A pencil comprising a tubular elongated casing, relatively movable cooperating means within said casing for releasably clutching lead adapted to be fed from within said casing to a point outwardly at one end thereof, manually operable means at the opposite end of the casing, second cooperating means operatively connected with said manually operable means and with said relatively movable cooperating means for operating the latter under control of said manually operable means, a hollow cap nozzle at one end of the casing and terminating in an opening, a freely suspended hollow slider within said hollow cap nozzle, said slider having a first position contiguous to an internal end wall of the cap nozzle and a second position spaced from said end wall, a tubular member fixed at one end thereof to said slider for movement therewith and having an opposite end which projects through said opening in said cap nozzle when lead is clutched by said relatively movable cooperating means, and means providing guided movement of said slider when moving from its first position to its second position as an incidence of a writing operation.
Claim 3
Dependent Claim
61 words
A pencil according to claim 1, wherein said relatively movable cooperating means comprise an annular stepped portion and a lead chucking member respectively carried by coaxially disposed tubes, said second cooperating means also being carried by said coaxially disposed tubes, a projection on that tube carrying said annular stepped portion and a recess in the slider adapted to receive said projection.
Claim 4
Dependent Claim
24 words
A pencil according to claim 2, wherein said tubes are biased by spring means in a direction toward said opposite end of the pencil.
Claim 5
Dependent Claim
138 words
A pencil according to claim 3, wherein second cooperating means comprise a push ring on one of the tubes and a rotary disc on the other of said tubes which surrounds said one tube, said one of the tubes being substantially longer than said other tube and terminating at said manually operable means, a first of said spring means surrounding said one tube and having its ends confined between two abutments one of which is carried by said one tube, said abutments being between said manually operable means and said push ring, a second of said spring means surrounding the other tube and having its ends confined between two further abutments one of which is carried by the other tube, said further abutments being between said rotary disc and said one end of the pencil above said slider.
Claim 6
Dependent Claim
63 words
A pencil according to claim 4, wherein said push ring has a first and a second position in relation to said rotary disc with said manually operable means in its undisplaced normal position, said slider being in said first position thereof with said push ring in said first position and in said second position with the push ring in said second position thereof.
References Cited (Backward Citations)
DE696120C
Cited
US3537799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |