Combustion-engined setting tool

• US 7,284,511 B2
• Filed: 10/31/2006
• Issued: 10/23/2007
• Est. Priority Date: 11/04/2005
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Erhardt, Rolf, Stauss, Peter, Zahner, Mario
• Primary Examiner(s): Cronin; Stephen K.
• Assistant Examiner(s): LEUNG, KA CHUN A
• Application Number:
  US11/591,045
• Publication Number:
  US 20070101954A1
• Time in Patent Office: 357 Days
• Field of Search: 123/46.R, 123/46.SC, 123/46.H, 123/198.D, 227/9, 227/10, 173/209
• US Class Current: 123/46.00H
• CPC Class Codes: B25C 1/08 operated by combustion pressure

Abstract

A combustion-engined setting tool for driving fastening elements in a constructional component end including a combustion chamber (13) for combusting a gas mixture, an inlet/outlet device (40) for opening the combustion chamber (13) in its first position and for closing the combustion chamber (13) in its second position and having a valve element for reversibly displacing the inlet/outlet device (40) between its first and second positions, a locking element (37) for locking the valve element of the inlet/outlet device (40) in the second position of the device, a trigger (30) for actuating the locking element (37), a release switch (22) for triggering ignition in the combustion chamber (13), an electronic control unit (20) for controlling start of the ignition in the combustion chamber (13), and an initialization switch connected with the control unit (20), the control unit (20) initiating the ignition in the combustion chamber (13) when a time period between switching-on of the initialization switch and switching-on of the release switch (22), which is also connected with the control unit, does not exceed a predetermined set time period.

Claims

1. A combustion-engined setting tool for driving fastening elements in a constructional component, comprising:

a combustion chamber (13) for combusting a gas mixture;

an inlet/outlet device (40) for opening the combustion chamber (13) and having a first position in which the combustion chamber is open, and a second position in which the combustion chamber (13) is closed, the inlet/outlet device (40) having valve means for reversibly displacing the inlet/outlet device (40) between the first and second positions thereof;

locking means (37) for locking the valve means of the inlet/outlet device (40) in the second position of the inlet/outlet device (40);

a trigger (30) for actuating the locking means (37);

a release switch (22) for triggering ignition in the combustion chamber (13);

an electronic control unit (20) for controlling start of the ignition in the combustion chamber (13), the release switch (22) being connected with the control unit (20); and

an initialization switch connected with the control unit (20), the control unit (20) initializing the ignition in the combustion chamber (13) when a time period between switching-on of the initialization switch and switching-on of the release switch (22) does not exceed a predetermined set time period.

2. A setting tool according to claim 1, wherein the initialization switch is formed as a trigger switch (21) that is switchable on dependent on a position of the trigger (30).

3. A setting tool according to claim 2, wherein the trigger (30) has a switching element (31) having a first switch arm (32) for actuating the release switch (22), a second switch arm (33) for actuating the trigger switch (21), and a locking member (34) forming part of the locking means (37).

4. A setting tool according to claim 1, wherein the control unit (20) comprises a time comparator (120) for comparing the time period between switching-on of the initialization switch and the release switch (22) with the set time period.

5. A setting tool according to claim 1, wherein the initialization switch is formed as a press switch (23) that is actuated by a press-on feeler (28) provided in a region of a bolt guide (18) of the setting tool.