Combustion-engined setting tool

• US 7,178,487 B2
• Filed: 09/06/2005
• Issued: 02/20/2007
• Est. Priority Date: 09/06/2004
• Status: Expired due to Fees

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Wolf, Iwan, Zahner, Mario, Petkov, Stefan
• Primary Examiner(s): Cronin; Stephen K.
• Assistant Examiner(s): LEUNG, KA CHUN A
• Application Number:
  US11/220,749
• Publication Number:
  US 20060048727A1
• Time in Patent Office: 532 Days
• Field of Search: 123/27.R, 123/46.H, 123/46.SC, 173/162.1, 173/209, 227/9
• US Class Current: 123/46.00H
• CPC Class Codes: B25C 1/08 operated by combustion pressure
• CPC Class Codes: B25C 5/1665 with means for preventing jamming or aiding unjamming within the drive channel

Abstract

A combustion-engined setting tool for driving fastening elements in constructional components includes a combustion chamber (14) for combusting therein a full gas-oxidant mixture, at least one guide element (20) arranged coaxially with a longitudinal axis (34) of the combustion chamber (14) for supporting axially displaceable wall (17) of the combustion chamber (14) for an axial displacement along the guide element (20) which is pivotally supported in a drag bearing (22), and a guide cylinder (12) adjoining the combustion chamber (14) in which a setting piston (11) is arranged for an axial displacement therein.

Claims

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

a combustion chamber (14) for combusting therein a fuel gas-oxidant mixture and having an axially displaceable wall (17);

at least one guide element (20) arranged coaxially with a longitudinal axis (34) of the combustion chamber (14) for supporting the axially displaceable wall (17) for an axial displacement therealong and pivotally supported in a drag bearing (22);

a guide cylinder (12) adjoining the combustion chamber (14); and

a setting piston (11) displaceably arranged in the guide cylinder (12).

2. A combustion-engined setting tool according to claim 1, wherein the drag bearing (22) is formed for providing a maximal pivot angle α

of the at least one guide element of no more than 10°

.

3. A combustion-engined setting tool according to claim 1, wherein the combustion chamber (14) has an end wall (16), and wherein at least one drag guide element (20) is supported centrally in the end wall (16).

4. A combustion-engined setting tool according to claim 3, wherein the end wall (16) adjoins an end of the guide cylinder (12) adjacent to the combustion chamber (14).

5. A combustion-engined setting tool according to claim 1, wherein the drag bearing (22) comprises an elastic element (23) for supporting a bearing section (24) of the guide element.

6. A combustion-engined setting tool according to claim 1, wherein the at least one guide element (20) is formed as a cylindrical guide bar (21).

7. A combustion-engined setting tool according to claim 1, further comprising a pivotally supported combustion chamber casing (15) for the axially expanding combustion chamber (14).