Injector head for a tool intended to inject substances into wood, comprising a needle holder, a cylinder provided with an inlet opening for the substance and an outlet opening that communicates with said needle holder, a piston in said cylinder that closes the aforementioned inlet opening, and a pressing member connected to said piston and adapted to engage the wood when the tool is used and to displace the piston by pressing against the wood, so that said inlet opening and the cylinder are loaded with the substance only when the needle has been inserted into the wood to the desired depth, and means to effect the piston return stroke in order to expel the substance from the cylinder through the needle passing it into the wood while the needle is withdrawn from this last. (Machine-translation by Google Translate, not legally binding)
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