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A typical construction of a ratchet-based mechanical pencil. A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead, often made of graphite, is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from ...
In 1955, Scripto was the first to introduce what it called Fluidlead. This was a pencil that wrote like a pen using liquid graphite. Another company, Parker Pens, had developed a similar product called Liquid Lead that was a few months behind Scripto in production. To avoid a costly patent fight the two companies agreed to share their formulas ...
A type of mechanical pencil has a rotating gear mechanism which rotates the lead slightly every time the lead is lifted off the paper, helping to maintain a consistent, sharp point. If a finer or broader line is needed, a separate mechanical pencil using a lead with a different diameter is required.
Although Mitsubishi Pencil started as a wooden pencil manufacturer, the company is no longer specialized in that product, focusing on mechanical pencils instead. [16] Uni-ball's writing implements brands include Jetstream (hybrid-ink ballpoint pens); Air, Eye (marketed as Vision in the U.S.A.) rollerball pens, Signo (pigment ink gel pens); Onyx, Kuru Toga (mechanical pencils); [17] Paint ...
A mechanism employed in the DelGuard system developed by Zebra, causes the lead sleeve in a mechanical pencil to extend outward when excessive pressure is applied at an angle. When excess vertical pressure is applied on the lead, the lead is automatically retracted inwards. Thus, the lead is protected (within certain limits) in both cases.
Pencils are commonly used at polling stations instead of pens. This is because ink might run on to different sections of the ballot and obscure the voter’s choice. The Facts.