US4219282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing implement
Assignee: Individual
•
Filing: 1978-06-26
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Granted: 1980-08-26
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Expires: 1998-06-26
Abstract
Abstract This invention relates to a writing implement comprising an outer casing, a coil spring disposed within the casing, an inner tube inserted through the coil spring and having a plurality of presharpened leads stored therewithin, and a capping member inserted over the open end of the inner tube. The front (writing) end of the inner tube is split into two clamping halves. The front end of the coil spring is formed into a hooked portion which slides along the slot formed between the clamping halves to allow the expelling and feeding of presharpened lead pieces into the clamping halves.
Inventors
- 👤 Chun-Liang Kuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:08
CPC Classifications
B; B43; B43K; B43K21/00; B43K21/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
257 words
A writing implement comprising: an outer casing; a coil spring having one end formed into a hooked portion and the other end being free, the spring being disposed within the outer casing; and an inner tube adapted for insertion into the outer casing and through the coil spring, the inner tube having an inside channel for storing a plurality of presharpened leads therein, the leads being stored in an end-to-end fashion with the sharpened end being pointed towards the front end of the inner tube, the front end of the inner tube being formed into conical clamp portions having two diametrically opposed slots extending from the front end and along the longitudinal axis of the inner tube, the slots having different lengths, the first slot being about 1/2 the length of a presharpened pencil lead, the second slot being five times the length of the first slot, the end wall of the second slot being excavated on the outside surface and along the longitudinal axis of the inner tube to form a slip channel, the inside diameter of the inner tube being reduced at the front end by an amount sufficient to frictionally withhold the leads therein, a plurality of protrusions being disposed at about 1/3 the length of the inner tube and on the outside surface thereof for compressing the free end of the coil spring the hooked portion of the coil spring being aligned to extend the hooked portion into the second slot and slide onto the slip channel when the coil spring is compressed.
Claim 2
Dependent Claim
257 words
A writing implement comprising: an outer casing; a coil spring having one end formed into a hooked portion and the other end being free, the spring being disposed within the outer casing; and an inner tube adapted for insertion into the outer casing and through the coil spring, the inner tube having an inside channel for storing a plurality of presharpened leads therein, the leads being stored in an end-to-end fashion with the sharpened end being pointed towards the front end of the inner tube, the front end of the inner tube being formed into conical clamp portions having two diametrically opposed slots extending from the front end and along the longitudinal axis of the inner tube, the slots having different lengths, the first slot being about 1/2 the length of a presharpened pencil lead, the second slot being five times the length of the first slot, the end wall of the second slot being excavated on the outside surface and along the longitudinal axis of the inner tube to form a slip channel, the inside diameter of the inner tube being reduced at the front end by an amount sufficient to frictionally withhold the leads therein, a plurality of protrusions being disposed at about 1/3 the length of the inner tube and on the outside surface thereof for compressing the free end of the coil spring the hooked portion of the coil spring being aligned to extend the hooked portion into the second slot and slide onto the slip channel when the coil spring is compressed.
Claim 3
Dependent Claim
27 words
The implement of claim 1 wherein the end of the hooked portion of the coil spring is bent outwardly towards the interior surface of the inner tube.
Claim 4
Dependent Claim
48 words
The implement of claim 2 wherein a circular groove is provided circumferentially in the outer tube to seal and immoblize the open end of the coil spring within the outer and inner tubes, the groove being located about 1/3 the length from the front end of the implement.
Claim 5
Dependent Claim
33 words
The implement of claim 3 wherein a plurality of undercuts are provided near the front end of the outer tube to engage the second winding from the hooked end of the coil spring.
Claim 6
Dependent Claim
21 words
The implement of claim 3 wherein a capping member for insertion over the rear end of the inner tube is provided.
Claim 7
Dependent Claim
18 words
The implement of claim 5 wherein an eraser is inserted into the free end of the capping member.
Claim 8
Dependent Claim
40 words
The implement of claim 5 wherein a plurality of plastic films are provided on the interior surface of the capping member and near the free end thereof for sealing the pencil leads within the inside channel of the inner tube.
References Cited (Backward Citations)
US480188A
Cited
US692440A
Cited
US1590126A
Cited
US1766271A
Cited
US2358091A
Cited
CH269528A
Cited
US3338215A
Cited
US3790291A
Cited
US3918819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |