Fuel-powered setting device and method for operating such a setting device

Patent metadata

Field	Value
Publication number	US-10926388-B2
Application number	US-201616063806-A
Country	US
Kind code	B2
Filing date	Dec 20, 2016
Priority date	Dec 22, 2015
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

The invention relates to a fuel-powered setting device for driving securing elements into a substrate, comprising at least one main combustion chamber for a fuel, a drive piston that can be driven out of the main combustion chamber in a setting direction by expandable gases, and a prechamber with which an ignition device is associated and in which a pressure acting on the main combustion chamber can build up prior to a fuel-air mixture being ignited in said main combustion chamber. To improve efficiency and/or functionality when driving in securing elements, the setting device can be operated in different energy classes by an energy adjustment.

First claim

The invention claimed is:

1. A fuel-powered setting device for driving securing elements into a substrate, comprising at least one main combustion chamber for a fuel; a drive piston that can be driven out of the main combustion chamber in a setting direction by expandable gases; and a pre-chamber with which an ignition device is associated and in which a pressure acting on the main combustion chamber can be built up prior to a fuel-air mixture being ignited in said at least one main combustion chamber; wherein the setting device comprises a control device for energy adjustment.

2. The fuel-powered setting device as claimed in claim 1 , wherein the pre-chamber is connected or connectable by at least one passage opening, which is closable by the control device, to an environment of the pre-chamber, wherein a flow cross section of the at least one passage opening is adjustable for the energy adjustment by the control device.

3. The fuel-powered setting device as claimed in claim 2 , wherein the control device has a positioning slide or a positioning sleeve comprising at least one positioning opening, which can be brought into line with the at least one passage opening, in order to change the flow cross section of the at least one passage opening.

4. The fuel-powered setting device as claimed in claim 3 , further comprising a positioning sleeve for the energy adjustment, wherein the positioning sleeve is guided so it is movable in relation to a pre-chamber cylinder, which has the at least one passage opening.

5. The fuel-powered setting device as claimed in claim 4 , wherein the positioning sleeve is movable in an electromotive manner.

6. The fuel-powered setting device as claimed in claim 5 , wherein the positioning sleeve for the energy adjustment is combined with a control sleeve, which is movable in relation to the at least one passage opening of the pre-chamber such that the at least one passage opening of the pre-chamber is released or closed by the control sleeve depending on the pressure in the at least one main combustion chamber.

7. The fuel-powered setting device as claimed in claim 2 , wherein the control device has at least one control pressure surface, to which the pressure in the at least one main combustion chamber is applied and which is mechanically coupled to a control sleeve, which is movable back and forth, and the control sleeve has a maximum stroke which can be varied for the energy adjustment.

8. The fuel-powered setting device as claimed in claim 2 , wherein the control device has at least one control pressure surface, to which the pressure in the at least one main combustion chamber is applied, and which is mechanically coupled to a control sleeve, which is movable in relation to the at least one passage opening of the pre-chamber such that the at least one passage opening of the pre-chamber is released or closed by the control sleeve depending on the pressure in the at least one main combustion chamber, wherein the control pressure surface is mechanically coupled by a coupling element to the control sleeve, wherein the control pressure surface is supported by at least one spring device on a stop, which is adjustable for the energy adjustment in order to adjust a pre-tension force of the spring device.

9. The fuel-powered setting device as claimed in claim 3 , wherein the positioning sleeve for the energy adjustment is combined with a control sleeve, which is movable in relation to the at least one passage opening of the pre-chamber such that the at least one passage opening of the pre-chamber is released or closed by the control sleeve depending on the pressure in the at least one main combustion chamber.

10. The fuel-powered setting device as claimed in claim 3 , wherein the positioning sleeve is movable in an electromotive manner.

11. The fuel-powered setting device as claimed in claim 10 , wherein the positioning sleeve for the energy adjustment is combined with a control sleeve, which is movable in relation to the at least one passage opening of the pre-chamber such that the at least one passage opening of the pre-chamber is released or closed by the control sleeve depending on the pressure in the at least one main combustion chamber.

12. The fuel-powered setting device as claimed in claim 4 , wherein the positioning sleeve for the energy adjustment is combined with a control sleeve, which is movable in relation to the at least one passage opening of the pre-chamber such that the at least one passage opening of the pre-chamber is released or closed by the control sleeve depending on the pressure in the at least one main combustion chamber.

13. The fuel-powered setting device as claimed in claim 1 , wherein a flow cross section of at least one overflow opening between the pre-chamber and the at least one main combustion chamber is variable for the energy adjustment by the control device.

14. A method for operating a fuel-powered setting device for driving securing elements into a substrate, the fuel-powered setting device comprising at least one main combustion chamber for a fuel; a drive piston that can be driven out of the main combustion chamber in a setting direction by expandable gases; and a pre-chamber with which an ignition device is associated and in which a pressure acting on the main combustion chamber can be built up prior to a fuel-air mixture being ignited in said at least one main combustion chamber; wherein the setting device comprises a control device for energy adjustment, the method comprising adjusting the energy for operating the setting device.

15. The method as claimed in claim 14 , wherein the fuel-powered setting device comprises at least one passage opening having a flow cross section, and the method comprises mechanically setting the flow cross section of the at least one passage opening for adjusting the energy.

16. The method as claimed in claim 14 , wherein the fuel-powered setting device comprises at least one passage opening having a flow cross section, and the method comprises electrically setting the flow cross section of the passage opening by at least one operating element, which is connected to the control device, for adjusting the energy.

17. The method as claimed in claim 14 , wherein the fuel-powered setting device comprises at least one passage opening having a flow cross section, and the method comprises turning on/off and/or regulating at least one valve device flow cross section of the at least one passage opening is for adjusting the energy.

18. The method as claimed in claim 14 , wherein the fuel-powered setting device comprises a control sleeve having an opening mechanism, and the method comprises manually setting the opening mechanism of the control sleeve for adjusting the energy.

19. The method as claimed in claim 14 , wherein the control device has a control pressure surface having an effective size, and the method comprises changing the effective size of the control pressure surface.

20. A device comprising a control device for adjusting energy, a positioning sleeve, a pre-chamber cylinder, a control sleeve, and/or a valve device for a fuel-powered setting device.

Assignees

• Hilti Ag

Inventors

• Schmidt Dominik
• Heeb Norbert
• Dittrich Tilo
• Bruggmueller Peter

Classifications

• B25C1/08 Primary

  operated by combustion pressure · CPC title