Coating implements with material supply – Solid material for rubbing contact or support therefor – Including means to advance material
Patent
1998-09-02
2000-09-12
Walczak, David J.
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including means to advance material
401 55, 401 75, A45D 4604
Patent
active
061168009
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention, relates to a writing instrument, especially a propelling pencil in which the stretching out, drawing back and the amount of stretching can be adjusted freely. The writing-core is stable for writing and can be used to replace wooden pencil. This type of propelling pencil is most suitable for children and can be adjusted by themselves easily.
TECHNICAL BACKGROUND
At present the internal component of the same type of the known propelling pencil is not satisfied. The utilization of the limited radial space of the shaft of the propelling pencil is not sufficient, wherein the adjusting core helical is formed of circular metal wire, as such not only the withstanding of the longitudinal pressure is unsufficient but also occupies more radial space, and causing the size of the writing-core holder moving within the space can not be increased for durable; the writing-core holder is easy to split and causing the whole propelling pencil damaged. Both clearance between double-ear and adjusting core helical fitted and interacted with each other, and the coincidence with the guide in the shaft of the propelling pencil are also not satisfied which influences the stability of the writing. The connection of the front portion and the shaft of the propelling pencil is complicated and not convention for manufacturing and using. Moreover, while the writing-core is nearly used up, the internal component may be jammed and damaged; the guide of the inner wall of the shaft is a groove specially made and not easy for using and manufacturing, and also wasting material. The mold is difficult to manufacture. Therefore, propelling pencil of the same type has not been practical yet.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a kind of propelling pencil which is practical, durable, convenient, low-cost and high utilization of the writing-core.
The object of the present invention can be achieved by the following propelling pencil.
In order to ensure the stable writing of writing-core, it is necessary for adjusting core helical itself to have endurance of longitudinal pressure and reducing the limited radial space occupied by it within the shaft of the propelling pencil, for the benefit of increasing the outer diameter and durable of the writing-core holder which is engaged and moves within the shaft of the propelling pencil. The adjusting core helical is formed by a flat metal wire which is used along its longitudinal direction, i.e., the helical is formed in such a manner that one of the two wider outer surfaces of the flat wire faces towards the axis of the helical. To compare with two adjusting core helices formed by flat and circular wire with same cross-sectional area and same metal wire, the former not only withstands larger longitudinal pressure but also occupies smaller radial space.
To avoid the internal component to be jammed and damaged when the writing-core is nearly used up and reduce unnecessary links for convenient for using and manufacturing, reduce cost and make a sufficient use of the writing-core, etc., the front portion of the propelling pencil is inserted directly into the lower end of the shaft of the propelling pencil and can be easily taken-off and put-on. The front portion of the propelling pencil can be pushed back to the original position by an internal component when the writing-core is nearly used up.
In order to conveniently use and manufacture the shaft of the propelling pencil, and save material and conveniently insert the double-ear of the holder into the guide of the shaft of the propelling pencil without seeking the way when fitting the writing-core into it. In the inner wall of the shaft a number of pairs of longitudinal ridges with substantially the same shape, size and distance spaced each other are provided. A number of longitudinal grooves with substantially the same width are formed between the ridges, any pair of these grooves can be served as a guide which controls the moving direction of the writing-core holder in the sha
REFERENCES:
patent: 966172 (1910-08-01), Smith
patent: 1556701 (1925-10-01), Liddell
patent: 4358210 (1982-11-01), Hashimoto et al.
patent: 4544296 (1985-10-01), Jarvis
patent: 4610557 (1986-09-01), Malm
Wang Dianjun
Wang Guofeng
Wang Guoyue
Walczak David J.
Wang Guoyue
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