Combustion-operated setting tool

Patent metadata

Field	Value
Publication number	US-9676089-B2
Application number	US-32133909-A
Country	US
Kind code	B2
Filing date	Jan 15, 2009
Priority date	Jan 29, 2008
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A combustion-operated setting tool ( 10 ) for driving-in fastening elements includes a setting piston ( 14 ) displaceable in a guide cylinder ( 13 ), a combustion chamber ( 15 ), a fuel inlet ( 23 ) opening into the combustion chamber ( 15 ) for feeding fuel therein and an ignition element ( 26 ) for igniting the fuel in the combustion chamber ( 15 ). Both, the fuel inlet ( 23 ) and the ignition element ( 26 ), are located at the first end ( 31 ) of the combustion chamber ( 15 ) adjacent to the guide cylinder ( 13 ), and a motor-driven ventilator ( 16 ) supported on a rear wall ( 30 ) of the combustion chamber ( 15 ) at the second end ( 32 ) of the combustion chamber ( 15 ) remote from the guide cylinder ( 13 ).

First claim

What is claimed is:

1. A combustion-operated setting tool ( 10 ) for driving in fastening elements, comprising:
a guide cylinder ( 13 );
a setting piston ( 14 ) displaceable in the guide cylinder ( 13 );
a combustion chamber ( 15 ) bordering the guide cylinder, defining a combustion chamber axis (A) and having a first axial end ( 31 ) adjacent to the guide cylinder ( 13 ) and a second axial end ( 32 ) spaced from the guide cylinder ( 13 );
a fuel inlet ( 23 ) opening into the combustion chamber ( 15 ) substantially parallel to the axis of the combustion chamber for feeding fuel therein and located at the first end surface ( 31 ) of the combustion chamber ( 15 );
an ignition element ( 26 ) for igniting the fuel in the combustion chamber ( 15 ) and likewise located at the first end surface ( 31 ) of the combustion chamber ( 15 );
a ventilator ( 16 ) located in the combustion chamber ( 15 ) and supported on a rear wall ( 30 ) of the combustion chamber ( 15 ) at the second end ( 32 ) thereof; and
a motor ( 17 ) for driving the ventilator ( 16 ).

2. A combustion-operated setting tool ( 10 ) according to claim 1 , wherein the fuel inlet ( 23 ) and the ignition element ( 26 ) lie on radii (R 1 , R 2 ) with respect to the combustion chamber axis (A) extending at an angle (α) to each other and that lies in a range from 5° to 180°.

3. A combustion-operated setting tool ( 10 ) according to claim 1 , wherein the ignition element ( 26 ) is located behind the fuel inlet ( 23 ) in a rotational direction ( 40 ) of the ventilator ( 16 ).

4. A combustion-operated setting tool ( 10 ) according to claim 1 , further comprising a fuel conduit ( 22 ) for connecting the fuel inlet ( 23 ) with a fuel reservoir.

5. A combustion-operated setting tool ( 10 ) according to claim 1 , wherein the fuel inlet ( 23 ) is located in a flow direction(s) of a flow generated by the ventilator ( 16 ).

6. A combustion-operated setting tool ( 10 ) according to claim 1 , wherein the ignition element ( 26 ) located in a flow direction(s) of a flow generated by the ventilator ( 16 ).

7. A combustion-operated setting tool ( 10 ) according to claim 1 wherein the ignition element ( 26 ) is located in a flow direction(s) of a flow generated by the ventilator ( 16 ).

8. A combustion-operated setting tool ( 10 ) for driving in fastening elements, comprising:
a guide cylinder ( 13 );
a setting piston ( 14 ) displaceable in the guide cylinder ( 13 );
a combustion chamber ( 15 ) defining a combustion chamber axis (A) and having a front wall ( 29 ) adjacent to the setting piston ( 14 ) and a rear wall ( 30 ) spaced from the setting piston ( 14 );
a fuel inlet ( 23 ) opening into the combustion chamber ( 15 ) for feeding fuel therein and located in the front surface of the combustion chamber ( 15 );
an ignition element ( 26 ) for igniting the fuel in the combustion chamber ( 15 ) and secured in the front surface of the combustion chamber ( 15 );
a ventilator ( 16 ) supported on the rear wall ( 30 ) of the combustion chamber ( 15 ); and
a motor ( 17 ) for driving the ventilator ( 16 ).

9. A combustion-operated setting tool ( 10 ) according to claim 8 , wherein the fuel inlet ( 23 ) and the ignition element ( 26 ) lie on radii (R 1 , R 2 ) with respect to the combustion chamber axis (A) extending at an angle (a) to each other and that lies in a range from 5° to 180°.

10. A combustion-operated setting tool ( 10 ) according to claim 8 , wherein the ignition element ( 26 ) is located behind the fuel inlet ( 23 ) in a rotational direction ( 40 ) of the ventilator ( 16 ).

11. A combustion-operated setting tool ( 10 ) according to claim 8 , further comprising a fuel conduit ( 22 ) for connecting the fuel inlet ( 23 ) with a fuel reservoir.

12. A combustion-operated setting tool ( 10 ) according to claim 8 , wherein the ventilator ( 16 ) is located in the combustion chamber ( 15 ).

13. A combustion-operated setting tool ( 10 ) according to claim 8 , wherein the fuel inlet ( 23 ) is located in a flow direction(s) of a flow generated by the ventilator ( 16 ).

14. A combustion-operated setting tool according to claim 8 , wherein the fuel inlet ( 23 ) opens into the combustion chamber ( 15 ) substantially axially.

Assignees

• Sauer Thorsten
• Heeb Norbert
• Dittrich Tilo
• Hilti Ag

Inventors

• Sauer Thorsten
• Heeb Norbert
• Dittrich Tilo

Classifications

• B25C1/08 Primary

  operated by combustion pressure · CPC title