Spiral pencil core
A pencil lead and spiral technology, which is applied in the field of writing supplies, can solve the problems of easy breaking of the pencil lead, and achieve the effects of not easy to break and improved strength.
Inactive Publication Date: 2011-03-23
金祚献
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Problems solved by technology
[0003] The purpose of the present invention is to provide a spiral pencil lead that is not easy to break and does not need to be cut, which solves the technical problems of the prior art that the lead needs to be sharpened and the lead is easy to break because of its small size.
Method used
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Embodiment Construction
[0013] Depend on Figure 1-3 Represents an embodiment of the present invention, a spiral pencil lead, which has a spiral groove (2) on the cylinder (1), and the shape of the spiral groove (2) can be U-shaped Groove, V-shaped groove or semicircular groove, the depth and pitch of the helical groove (2) can be determined according to the requirements of strength or actual needs, and the spiral pencil lead can control the expansion and contraction of the pen core through the helical groove without a spring. It is convenient for making a simple pen holder. Due to the use of the spiral groove (2), the strength of the pencil lead is greatly improved and is not easy to break. The cross-sectional area of the spiral pencil lead is smaller than the cross-sectional area of the cylinder (2), so thinner lines can be written, and it is suitable for writing fonts or outlines in hook sketches. Refills can be made in various colors.
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The invention relates to a spiral pencil core. The spiral pencil core is characterized in that a cylinder (1) is provided with a spiral groove (2) surrounding in a spiral mode; the spiral groove (2) can be a U-shaped groove, a V-shaped groove or a semicircle-shaped groove; the depth and the screw pitch of the spiral groove (2) can be determined according to requirements on the strength or the practical needs; and the retraction of the spiral pencil core can be controlled through the spiral groove, without a spring, thereby facilitating the making of simple pencil holders. By adopting the spiral groove (2), the strength of the pencil core is increased substantially, and the pencil core is not easy to break off. The cross sectional area of the spiral pencil core is less than that of the cylinder (1) thereof, therefore, the spiral pencil core can be used for writing thinner lines and is suitable for writing fonts or drawing outlines in sketch. The pencil core can be made into various colors. The invention provides the spiral pencil core which is not easy to break off and free of sharpening, and solves the technical problems that the pencil core needs to be sharpened and is easy to break off because the pencil core is too fine in the prior art.
Description
technical field [0001] The invention belongs to the technical field of writing supplies, and in particular relates to a spiral-shaped pencil lead which is not easy to break and does not need to be cut. Background technique [0002] At present, the popular pencils are roughly divided into traditional wooden pencils and mechanical pencils. Wooden pencils need to sharpen the pen holder and refill frequently, which is time-consuming, troublesome and wasteful of materials, which is extremely inconvenient; and mechanical pencils do not need to sharpen the pen holder and refill. Although it is convenient, the refill is small and will break if you are not careful, which not only wastes the refill but also affects the writing mood of the author; Contents of the invention [0003] The purpose of the present invention is to provide a spiral pencil lead that is not easy to break and not to be sharpened, which solves the technical problems of the prior art that the pencil lead needs to...
Claims
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Inventor 金祚献
Owner 金祚献