Energy-saving pencil with unlimited extension

Abstract

The invention discloses a saving pencil capable of being prolonged infinitely. A section of 2-4 cm long trapezoidal threads is arranged at each of the two ends of the pencil, the outer diameter of the threads is smaller than the diameter of the pencil by 0.2-2 mm, a stopping groove is formed in the middle section of the threads, one threaded end of the pencil is provided with a connecting piece in screw driving connection with the pencil, the lead angle of internal threads of the connecting piece and the lead angle of external threads of the end of the pencil are smaller than an equivalent friction angle, a pair of elastic clamp springs with one ends fixed and the other ends moving freely is arranged on the opposite portions of the two ends of the connecting piece, when the connecting piece moves, a clamp fastener is clamped to the stopping groove for location. When a leftover pencil cannot be held for writing, the threaded end of another pencil is screwed into the connecting piece, the length of the leftover pencil is increased so that the leftover pencil can be held for writing, the utilization rate of the pencil is improved, waste is reduced, and resources are saved.

Description

technical field [0001] The invention relates to a pencil, in particular to an energy-saving pencil with infinite extension. Background technique [0002] It can be seen from the situation of the use of student pencils that the effective utilization rate of a pencil is less than two-thirds, and the remaining pencils are discarded because they cannot be held for writing. According to the incomplete statistics of relevant personnel, about 700 million pencils are discarded by primary school students in the country every year, including about 4410 cubic meters of discarded wood and about 420 cubic meters of lead core. The amount of waste is very alarming. So someone invented a sleeve that connects half pencils. Because the connected sleeve has a large shape, it is uncomfortable to hold the pen and affects writing. At the same time, the inner diameter of the sleeve is difficult to adapt to pencils of various specifications. Therefore, , not recognized by the market, it is difficu...

AI Technical Summary

Problems solved by technology

So someone invented a sleeve that connects half pencils. Because the connected sleeve has a large shape, it is uncomfortable to hold the pen and affects writing. At the same time, the inner diameter of the sleeve is difficult to adapt to pencils of various specifications. Therefore, , not recognized by the market, it is difficult to promote the use of

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