COMBUSTION CHAMBER AND DRIVE-IN DEVICE

• US 20190047129A1
• Filed: 01/31/2017
• Published: 02/14/2019
• Est. Priority Date: 02/01/2016
• Status: Active Application

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: SPERRFECHTER, Thomas, BARTZ, Thorsten, STAUSS-REINER, Peter, MEIER, David
• Application Number:
  US16/073,369
• Publication Number:
  US 20190047129A1
• Time in Patent Office: Days
• CPC Class Codes: B25C 1/008 Safety devices
• CPC Class Codes: B25C 1/08 operated by combustion pressure

Abstract

A combustion chamber has a combustion chamber wall formed as a hollow cylinder defining a cylinder axis, a bottom that is adjustable along the cylinder axis within the hollow cylinder, relative to the combustion chamber wall, and a seal, which lies against the bottom on the one side and against the combustion chamber wall on the other side, in a radial direction with reference to the cylinder axis. The seal comprises a first seal ring extending in the circumferential direction with reference to the cylinder axis and has a first interruption, and a second seal ring extending in the circumferential direction with reference to the cylinder axis and has a second interruption. The first interruption has a first angular position along the circumferential direction, and the second interruption has a second angular position along the circumferential direction, wherein the first angular position and the second angular position form an angle.

Claims

1. A combustion chamber comprising a combustion chamber wall in a form of a hollow cylinder that defines a cylinder axis;

a bottom that is adjustable along the cylinder axis within the hollow cylinder relative to the combustion chamber wall; and

a seal, which lies against the bottom on the one side of the seal and against the combustion chamber wall on the other side of the seal, in a radial direction with reference to the cylinder axis, wherein the seal comprises a first seal ring that extends in the circumferential direction with reference to the cylinder axis and has a first interruption, and a second seal ring having a second interruption, the second seal ring extending in the circumferential direction with reference to the cylinder axis, wherein the first interruption has a first angular position along the circumferential direction and the second interruption has a second angular position along the circumferential direction, wherein the first angular position and the second angular position form an angle that is greater than 0° and

less than 180°

.

2. The combustion chamber according to claim 1, wherein the first angular position and the second angular position form an angle that is less than 120°

.

3. The combustion chamber according to claim 1, wherein the first angular position and the second angular position form an angle that is greater than 30°

.

4. The combustion chamber according to claim 1, wherein the second seal ring follows the first seal ring in an axial direction with reference to the cylinder axis.

5. The combustion chamber according to claim 1, wherein the seal has a fixation apparatus for fixing the angle formed by the first and the second angular position in place.

6. The combustion chamber according to claim 5, wherein the fixation apparatus comprises a projection on the first seal ring and a recess on the second seal ring, wherein the projection projects into the recess.

7. The combustion chamber according to claim 1, wherein the first and/or the second seal ring consist(s) of a hard sealant.

8. The combustion chamber according to claim 1, wherein the bottom has a groove that runs in the circumferential direction, into which the first and/or the second seal ring project(s).

9. The combustion chamber according to claim 1, wherein the combustion chamber comprises an elastic support element, which is disposed between the bottom and the seal in the radial direction, and which biases the first and/or the second seal ring against the combustion chamber wall.

10. The combustion chamber according to claim 1, wherein the bottom can be adjusted relative to the combustion chamber wall in an axial direction with reference to the cylinder axis, to such an extent that an inlet opening and/or an outlet opening of the combustion chamber forms between the bottom and the combustion chamber wall.

14. The combustion chamber according to claim 2, wherein the first angular position and the second angular position form an angle that is less than 90°

.

15. The combustion chamber according to claim 14, wherein the first angular position and the second angular position form an angle that is less than 60°

.

16. The combustion chamber according to claim 2, wherein the second seal ring follows the first seal ring in an axial direction with reference to the cylinder axis.

17. The combustion chamber according to claim 3, wherein the second seal ring follows the first seal ring in an axial direction with reference to the cylinder axis.

18. The combustion chamber according to claim 2, wherein the seal has a fixation apparatus for fixing the angle formed by the first and the second angular position in place.

19. The combustion chamber according to claim 3, wherein the seal has a fixation apparatus for fixing the angle formed by the first and the second angular position in place.

20. The combustion chamber according to claim 4, wherein the seal has a fixation apparatus for fixing the angle formed by the first and the second angular position in place.

11. A fastener driving tool, having a driving piston for driving a fastening element into a work piece, having a combustion chamber in which a propellant can be combusted to drive the driving piston, wherein the combustion chamber comprises a combustion chamber wall in a form of a hollow cylinder that defines a cylinder axis;

a bottom that is adjustable along the cylinder axis within the hollow cylinder relative to the combustion chamber wall; and

a seal, which lies against the bottom on the one side of the seal and against the combustion chamber wall on the other side of the seal, in a radial direction with reference to the cylinder axis, wherein the seal comprises a first seal ring that extends in the circumferential direction with reference to the cylinder axis and has a first interruption, and a second seal ring having a second interruption, the second seal ring extending in the circumferential direction with reference to the cylinder axis, wherein the first interruption has a first angular position along the circumferential direction and the second interruption has a second angular position along the circumferential direction, wherein the first angular position and the second angular position form an angle that is greater than 0° and

less than 180°

.

12. The fastener driving tool according to claim 11, wherein the fastener driving tool has a housing and that the combustion chamber wall is rigidly connected with the housing.

13. The fastener driving tool according to claim 11, wherein the fastener driving tool has a housing and that the bottom is rigidly connected with the housing.