Stiftpenna
En stiftpenna är en blyertspenna med lösa stift som uppfanns ungefär samtidigt av amerikanen Charles R. Keeran och japanen Tokuji Hayakawa.
Keeran uppfann sin penna Eversharp 1913 och fick patent på den 1915.
Tokuji Hayakawa (1894-1980) uppfann en stiftpenna år 1915, som han kallade Ever-Ready Sharp Pencil. Tokuji Hayakawa sålde patenträttigheterna 1923 till ett företag i Osaka och började kort tid senare att tillverka radioapparater och lade därigenom grunden till det som kom att bli det framtida elektronikföretaget Sharp.
Externa länkar
Wikimedia Commons har media som rör Stiftpenna.- A Tale of Two Pencils: Keeran's Eversharp & Hayakawa's Ever-Ready Sharp
- Sharp Corporation, Ever-Sharp, officiell webbplats
Media som används på denna webbplats
Staedtler Mars Lumographs refill leads 1903.jpg
Författare/Upphovsman: Sinikka Halme, Licens: CC BY-SA 4.0
Staedtler Mars Lumographs refill leads No. 1903. Staedtler Mars logotype from 1925.
Författare/Upphovsman: Sinikka Halme, Licens: CC BY-SA 4.0
Staedtler Mars Lumographs refill leads No. 1903. Staedtler Mars logotype from 1925.
2 mm mechanical pencil, H Leads and sharpener.jpg
Författare/Upphovsman: Mansaxel, Licens: CC BY-SA 4.0
This is a collection of utensils associated with the 2 mm mechanical pencil represented by yellow artefact, by Koh-I-Noor Hardtmuth, with a Faber-Castell H hardness leads container and a vintage sharpener for mechanical pencils marked "BREVETE DANS TOUS LES PAYS" and "SWISS MADE". The sharpener is used by mounting a lead in the mechanical pencil, extending it some 5 mm, inserting the tip of the pen in the hole in the top ball as far as it goes, and moving the protruding end of the pencil in a circular motion. The ball will guide the pencil and lead around the abrasive inner surface of the sharpener, and this grinds the lead into a sharp tip.
Författare/Upphovsman: Mansaxel, Licens: CC BY-SA 4.0
This is a collection of utensils associated with the 2 mm mechanical pencil represented by yellow artefact, by Koh-I-Noor Hardtmuth, with a Faber-Castell H hardness leads container and a vintage sharpener for mechanical pencils marked "BREVETE DANS TOUS LES PAYS" and "SWISS MADE". The sharpener is used by mounting a lead in the mechanical pencil, extending it some 5 mm, inserting the tip of the pen in the hole in the top ball as far as it goes, and moving the protruding end of the pencil in a circular motion. The ball will guide the pencil and lead around the abrasive inner surface of the sharpener, and this grinds the lead into a sharp tip.
The sharpener can be divided into its parts by unscrewing the bottom. This releases the ball, and also allows the perhaps unsuspecting user to empty the grounds from sharpening.
The pencil and the leads package are recent (circa 2016) acquisitions, while the sharpener stems from the early 1960s.