Clamp

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Eccentric clamp made of wood with steel rail Characteristic of the slotted wooden jaw with lever

A clamp is a clamping tool for clamping, fixing and gluing workpieces. Clamp clamps usually achieve less clamping forces than screw clamps .

Other names for clamp are wooden clamp, Klemmsia or glue clamp .

Clamp clamps as a clamping device in a joinery

Operation and use

The clamp consists of a steel rail, two wooden jaws with cork pressure surfaces and an eccentric lever . One jaw is attached to one end of the rail, the other can be moved on the rail to adapt it to workpieces of different thicknesses. It is slotted, the resulting wing is pressed towards the fixed jaw by means of the eccentric lever. The steel rail serves as an abutment for the clamping process. With suitable dimensions and choice of material, self-locking prevents further slipping during clamping .

On the one hand, the cork on the printing surfaces protects the workpiece surfaces, so that no further protection is necessary, e.g. when processing polished or lacquered wood. On the other hand, the clamps hold well on sloping or curved parts, for example when glueing chairs usually no allowances are required. Due to the lower force applied than with other clamping tools, there is less risk of pressure points. Clamping clamps are used in woodworking in carpentry , musical instrument making , restoration and other fine applications or by do-it-yourselfers .

The clamps are in the spans ( "A") of 200 mm to 1200 mm, the projection or cutting depth ( "B") is usually 110 mm.

history

Before the clamp, first introduced and marketed as “Klemmsia”, clamps called “Sergeant” had the same structure, but without an eccentric lever and often with a wooden rail instead of a steel rail. The carpenter Ernst Dünneman in Hanover had the idea for the “Klemmsia” around 1914. It was patented in 1918 and initially manufactured in manual series production. It was presented to a wide international audience at the 1953 Hanover Fair.

Individual evidence

  1. ↑ Erkelenz, Wittchen, Zeiß: Holzfachkunde for joiners, wood mechanics and window builders , 3rd edition, BG Teubner, Stuttgart 1998, page 135 ISBN 978-3-322-94116-9
  2. ^ Günther Heine: The carpenter's and turner's tool , Verlag Th. Schäfer, Hanover 1990, page 44 ISBN 3-87870-596-4
  3. ↑ a b Klemmsia clamps , product description on klemmsia.de, Internet site of Ernst Dünnemann GmbH & Co.KG
  4. ↑ Karl Göttlich: Wood ABC. Fachbuchverlag, Leipzig 1957, p. 170 f.
  5. ↑ North German Carpenter Guild Association (publisher): Book of the carpenter A manual for the carpenter's apprentice; Alfred Georgi, Deutscher Handwerksverlag, Hanover 1929, page 62
  6. ^ Theodor Krauth and Franz Sales Meyer: Das Schreinerbuch Ⅰ.Die Bausschreinerei Ⅰ Volume: Text , Verlag von EA Seemann, Leipzig 1899, Reprint Edition "Libri rari" Th. Schäfer GmbH, Hanover 1981, pages 55-56
  7. ↑ 'Efficient for 85 years.' ( Memento of July 20, 2016 in the Internet Archive ) In exactly 4/2013, p. 50 f (pdf ,genau-magazin.de, accessed March 30, 2014)