DRIVE-IN DEVICE HAVING AN ADJUSTABLE COMBUSTION CHAMBER

• US 20170341210A1
• Filed: 12/16/2015
• Published: 11/30/2017
• Est. Priority Date: 12/19/2014
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: STAUSS-REINER, Peter, HEEB, Norbert, SPERRFECHTER, Thomas, WOERNER, Markus, DITTRICH, Tilo
• Granted Patent: US 10,639,777 B2
• Time in Patent Office: Days
• CPC Class Codes: B25C 1/008 Safety devices
• CPC Class Codes: B25C 1/08 operated by combustion pressure

Abstract

The invention relates to a drive-in device, comprising a drive-in piston, guided in a cylinder, for driving a nail member into a workpiece, and a combustion chamber arranged above the drive-in piston, said combustion chamber being Tillable with a combustion gas, wherein the combustion chamber has a bottom that is adjustable along an axis, wherein the bottom has a groove that extends in the circumferential direction and has an inserted seal which bears in a radial direction against a rigid combustion-chamber wall, wherein a front surface, in the axial direction, of the seal protrudes in the direction of the axis from a terminating plane of the groove.

Claims

1. A drive-in tool, comprising

a drive-in piston which is guided in a cylinder for driving a nail member into a workpiece, and

a combustion chamber which is arranged over the drive-in piston and which can be filled with a combustion gas,

wherein the combustion chamber has a cylindrical combustion chamber wall and a bottom that is adjustable with respect to the combustion chamber wall along an axis,

wherein the bottom has a groove running in a circumferential direction and having a seal that rests against the combustion chamber wall in a radial direction,

the groove, having a terminating plane and the seal having

a front surface in an axial direction protruding in the direction of the axis in front of the terminating plane of the groove.

2. The drive-in tool according to claim 1, wherein the front surface of the seal protrudes over a terminating plane of the bottom in the direction of the axis.

3. The drive-in tool according to claim 1, wherein the front surface of the seal has a radially inner end having a sharp-edged termination.

4. The drive-in tool according to claim 1, including a recess for discharging water wiped off by the seal arranged on the combustion chamber bottom and/or in a region of the combustion chamber.

5. The drive-in tool according to claim 1, wherein the seal protrudes on both sides over the terminating plane of the groove.

6. The drive-in tool according to claim 1, wherein the seal comprises a sealing ring that is open in the circumferential direction.

7. The drive-in tool according to claim 6, wherein the sealing ring comprises a hard sealant.

8. The drive-in tool according to claim 6, wherein the seal comprises at least two sealing rings arranged successively in the axial direction.

9. The drive-in tool according to claim 6, further comprising an elastic support member arranged under the sealing ring.

10. The drive-in tool according to claim 1, wherein the drive-in tool comprises a housing and the combustion chamber wall is rigidly connected to the housing.

11. The drive-in tool according to claim 1, wherein the drive-in tool comprises a housing and the bottom is rigidly connected to the housing.

12. The drive-in tool according to claim 1, wherein the bottom is adjustable relative to the combustion chamber wall to such an extent as to form an inlet and/or outlet opening of the combustion chamber between the bottom and the combustion chamber wall.

13. The drive-in tool according to claim 3, wherein the sharp-edged termination comprises an edge having an angle between 30°

and 120°

.

14. The drive in tool according to claim 8, wherein the at least two sealing rings have been inserted into the groove.

15. The drive-in tool according to claim 2, wherein the front surface of the seal has a radially inner end having a sharp-edged termination.

16. The drive-in tool according to claim 2, including a recess for discharging water wiped off by the seal arranged on the combustion chamber bottom and/or in a region of the combustion chamber.

17. The drive-in tool according to claim 3, including a recess for discharging water wiped off by the seal arranged on the combustion chamber bottom and/or in a region of the combustion chamber.

18. The drive-in tool according to claim 2, wherein the seal protrudes on both sides over the terminating plane of the groove.

19. The drive-in tool according to claim 3, wherein the seal protrudes on both sides over the terminating plane of the groove.

20. The drive-in tool according to claim 4, wherein the seal protrudes on both sides over the terminating plane of the groove.