Combustion-engine setting tool

Abstract

A combustion-engined setting tool for driving fastening elements in a workpiece includes a combustion chamber (14) for an oxidant-fuel mixture, a ventilator (16) located in the combustion chamber and driven by an electric motor (18), and an electrical energy source (24) for supplying electrical energy to the electric motor (18) which forms part of a generator unit (30) for generating the electrical energy.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings show:

FIG. 1 a longitudinal partially cross-sectional view of a setting tool according to the present invention;

FIG. 2 a cross-sectional view along line II-II in FIG. 1;

FIG. 3 a cross-sectional view along line II-II in FIG. 1 during a setting process; and

FIG. 4 a partially cross-sectional view of a section of the setting tool shown in FIG. 1.

Claims

1. A combustion-engined setting tool for driving fastening elements in a workpiece, comprising: a combustion chamber (14) for an oxidant-fuel mixture;a ventilator (16) located in the combustion chamber;an electric motor (18) for driving the ventilator (16); andelectrical energy source (24) for supplying electrical energy to the electric motor (18), the electric motor (18) forming part of a generator unit (30) for generating the electrical energy.

2. A combustion-engined setting tool according to claim 1, wherein the generator unit (30) has a control unit (31) for switching the electric motor (18) between a motor operational state and a generator operational state.

3. A combustion-engined setting tool according to claim 1, wherein the generator unit (30) has a generator shaft (37), a drive for rotating the generator shaft (37), and idle means (47) for connecting the generator shaft (37) with a rotor shaft (17) of the electric motor (18).

4. A combustion-engined setting tool according to claim 3, further comprising pulling rope means (36) for connecting the device (40) with the generator shaft (37).

5. A combustion-engined setting tool according to claim 4, wherein the drive (40) has at least one cylinder (32) communicating with the combustion chamber (14), and a piston (33) displaceable in the at least one cylinder (32) and connected with the generator shaft (37).

6. A combustion-engined setting tool according to claim 5, wherein the pulling rope means (36) is secured to the piston (33) on one hand and, on the other hand, is wound about the generator shaft (37).

7. A combustion-engined setting tool according to claim 3, further comprising a spring (38) connected with the generator shaft (37).