A tack is a short nail with large, curved head out of sheet metal, which is used for the notice by documents and easily by hand again be removed can. The tack is called also drawing pin, drawing board pin, thumbtack, bug or Pinne. Latter term designates often also specifically pin wall purposes with a higher full plastic head.

The original determination of the tack was fastening designs on drawing boards. These tacks consisted of a short very pointed steel needle, which was held by a flat head from brass.

The tack was invented after today's knowledge conditions by the Uhrmacher Johann Kirsten between 1902 and 1903 in the city Lychen in the Uckermark in Brandenburg. In close proximity to Lychen is also a tack monument. It sold its idea for little money to the buyer Lindstedt. This announced it in the year 1904 to the patent. The patent specification is expressed in the designation thumbtack. The patent application made the buyer the millionaire. The Uhrmacher was not taken part in the profits. Other sources write to the Austrian factory owner Heinrich Sachs, not completely free of doubts, the invention of the drawing pin in the first quarter 20. Century too. Doubts over the exact invention year of the tack prepare encyclopedia entries, which lead back into the year 1887 and which as indication implement describe article.

Modern tacks have i.d.R. a small plastic coat over the head, which reduces the danger of injury, if the nail separates from the head and slips through to the rear.

Production

Tacks are manufactured, as a piece of firm wire is pulled through by a hole in the punched sheet metal head, and then the out-standing end is flat-pressed. Head and wire "merge". The point results from diagonal cutting of the wire off. Afterwards by electrolysis a rust protection alloy with brass is applied on the tack. The for the head is punched out with the help of a cylinder from plastic foil and expenditure-curved by a second cylinder within first.

See also

• Attaching
• Technical design
• Drawing board

Articles in category "Tack"

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