The TE17 has become a bit of a legend on its own accord. Hilti took over part of the Torna production in 1967 and a developed a smaller 5 kg version for its own brand. Hilti acquired service and repair contract rights from Torna Torna machines could hence be handed in at Hilti sales points for servicing. The Swiss firm Torna acquired production license rights from Skil USA and built the 726 as the Torna 765 for the European market, from 1965. Skil's first large commercial hammer drill was the 726 from 1964. The development started in 1948 and resulted in the piston and powder cartridge type nail shooter in 1958, for which the main Hilti factory in Schaan was built in 1954.Ĭontrary to popular believe, the pneumatic hammer drill was not invented by Hilti but by Skil in 1962. artillery shells or hardened steel nails in stone walls) they invented gunpowder driven systems to shoot fastening systems directly into stone without multi-blow hammering or pre-drilling. Upon learning about shockwave projectile propagation behaviour in solid materials (e.g. The brothers were keen weaponry fans and were good shots themselves. The brothers Martin and Eugen Hilti started off their small scale machine parts manufacturing shed in Schaan (Liechtenstein) in 1941 and mainly catered for the Swiss textile industry. The TE17 was Hilti's first hammer drill construction. This is not an elegant solution, but for short term makeshift jobs it suffices. These chisels in fact slip inside the drill bajonet coupler, meaning that the coupler turns round idly around the chisel shaft and only the hammering energy is transfered to the chisel tip or edge.
For that you need special chisel bits with the coupling recesses having been fretted away on a lathe. The machine offers no hammering-only function. By shoving back and locking the rubber housing bajonet, you combine the rotation with the hammering function again. By rotating it and shoving it forward towards the drill bajonet (with a few centimeters of blank alloy cylinder becoming visible) you decouple the hammering mechanism, leaving you with a rotation-only machine. Between the drill bajonet and the cast motor and gear housing is a rubber clad studded bajonet, surrounding the piston system. Hilti introduced it in 1967 and so there's no electronics or left/right rotation option yet.
Next time i'm delving into this pile and getting close enough to fetch it, i'll scan the manual for you and sent it through this forum. I have the machine, the case and the brochure, but this set is buried somewhere deep beneath a stockpile of tools in storage.
Its original carrying case rather came with a 12 page brochure, containing a few pages about the workings and the maintenance, with the remaining print being dedicated to the available accessories and their application. There was never much of a handbook on the TE17.
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