FASTENER DRIVING TOOL AND METHOD FOR OPERATING A FASTENER DRIVING TOOL

• US 20120153002A1
• Filed: 12/14/2011
• Published: 06/21/2012
• Est. Priority Date: 12/15/2010
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: DITTRICH, Tilo
• Granted Patent: US 9,687,975 B2
• Time in Patent Office: Days
• US Class Current: 227/10
• CPC Class Codes: B25C 1/00 Hand-held nailing tools hammers per se B25D; nailing machines B27F7/02; Nail feeding devices
• CPC Class Codes: B25C 1/06 operated by electric power
• CPC Class Codes: B25C 1/08 operated by combustion pressure

Abstract

A fastener driving tool and method for driving fasteners into a substrate is disclosed. The tool includes a working piston that is capable of being moved abruptly translationally by igniting an ignitable mixture in a combustion chamber so as to drive a fastener, such as a stud or a nail. The volume of the combustion chamber is adjustable. In order to further improve the operation and/or energy efficiency of the fastener driving tool, the fastener driving tool also includes a control device which is connected in a control relationship to an adjusting device for adjusting the combustion chamber volume and to a metering valve device for metering fuel gas.

Claims

1. A fastener driving tool for driving fasteners into a substrate, comprising:

a working piston;

a combustion chamber, wherein the working piston is drivable by the combustion chamber and wherein a volume of the combustion chamber is adjustable;

an adjusting device, wherein the volume of the combustion chamber is adjustable by the adjusting device;

a metering valve device, wherein a fuel gas providable to the combustion chamber is meterable by the metering valve device; and

a control device, wherein the adjusting device and the metering valve device are controllable by the control device.

2. The fastener driving tool according to claim 1, wherein the adjusting device includes a motor.

3. The fastener driving tool according to claim 2, wherein the motor is linked by a gear mechanism to an adjustable wall of the combustion chamber.

4. The fastener driving tool according to claim 1, further comprising an energy adjustment operating device and an energy indicator device, wherein the energy adjustment operating device and the energy indicator device are controllable by the control device.

5. A method for operating a fastener driving tool, comprising the steps of:

adjusting a volume of a combustion chamber by a control device; and

metering of a flow of a fuel gas into the combustion chamber by the control device.

6. The method according to claim 5, further comprising the steps of measuring a combustion chamber volume and comparing the measured combustion chamber volume with a target combustion chamber volume.

7. The method according to claim 6, further comprising the step of determining a control variable from a deviation between the measured combustion chamber volume and the target combustion chamber volume.

8. The method according to claim 5, further comprising the steps of triggering a reset of the fastener driving tool and, during the reset, calibrating a setting of the combustion chamber volume and/or a metering of the fuel gas flow into the combustion chamber.

9. The method according to claim 8, further comprising the step of, during the reset, moving an adjusting device for adjusting the volume of the combustion chamber against a limit stop.

10. The method according to claim 5, further comprising the step of measuring the volume of the combustion chamber volume by a sensor device.

11. The method according to claim 5, wherein the step of metering includes the step of opening a normally closed metering valve device for a predefined length of time by the control device such that a specified amount of fuel gas flows into the combustion chamber.

12. The method according to claim 5, further comprising the step of indicating a desired amount of driving energy, a minimally possible amount of driving energy, and/or a maximally possible amount of driving energy on the fastener driving tool.