Drive-in device having an adjustable combustion chamber

• US 10,639,777 B2
• Filed: 12/16/2015
• Issued: 05/05/2020
• 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
• Primary Examiner(s): Stinson, Chelsea E
• Application Number:
  US15/535,612
• Publication Number:
  US 20170341210A1
• Time in Patent Office: Days
• Field of Search: 227 10, 227130
• 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 in the groove that rests against the combustion chamber wall in a radial direction,

the groove, having a terminating plane and the seal having a surface in an axial direction protruding over the terminating plane of the groove.

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

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

4. 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.

5. The drive-in tool according to claim 2, 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 surface of the seal in the axial direction has a radially inner having a sharp-edged termination.

7. The drive-in tool according to claim 6, wherein the sharp-edged termination comprises an edge having an angle between 30°

and 120°

.

8. The drive-in tool according to claim 6, 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.

9. The drive-in tool according to claim 6, wherein the seal protrudes on both sides over the terminating plane of the groove.

10. 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.

11. The drive-in tool according to claim 10, wherein the seal protrudes on both sides over the terminating plane of the groove.

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

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

14. The drive-in tool according to claim 13, wherein the sealing ring comprises a hard sealant.

15. The drive-in tool according to claim 13, wherein the seal comprises at least two sealing rings arranged successively in the axial direction.

16. The drive in tool according to claim 15, wherein the at least two sealing rings have been inserted into the groove.

17. The drive-in tool according to claim 13, further comprising an elastic support member arranged under the sealing ring.

18. 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.

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

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