Hand-held power tool and production method

Patent metadata

Field	Value
Publication number	US-9969072-B2
Application number	US-201213440643-A
Country	US
Kind code	B2
Filing date	Apr 5, 2012
Priority date	Apr 19, 2011
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A production method provides for punching holes in a metal strip, cold-forming the metal strip to form a guide tube, and joining the lengthwise edges of the metal strip to each other by a seam or teeth so as to create a uniform material. Subsequently, a piston-like striker is inserted into the guide tube.

First claim

What is claimed is:

1. A hand-held power tool with a pneumatic striking mechanism comprising:
a motor-driven exciter;
a guide tube having an inside; and
a piston-shaped striker, the piston-shaped striker passing through the inside of the guide tube and, with the exciter, delimiting an air spring in the guide tube, the guide tube being made of a metal strip bent to form the guide tube with opposite lengthwise edges joined by at least one of a seam and a positive fit created by teeth, the striker guided by the inside of the guide tube so as to be in contact with the guide tube in a radial direction.

2. The hand-held power tool as recited in claim 1 wherein the seam is wound helically around a working axis of the guide tube.

3. The hand-held power tool as recited in claim 1 wherein the guide tube has punched ventilation openings.

4. The hand-held power tool as recited in claim 3 wherein the punched ventilation openings have an indentation on the inside of the guide tube.

5. The hand-held power tool as recited in claim 1 wherein the guide tube has a first set of openings having a first diameter, and a second set of openings having a second diameter greater than the first diameter, the second set of openings being arranged to be offset with respect to the first set of openings in a striking direction of the pneumatic striking mechanism.

6. The hand-held power tool as recited in claim 1 wherein the metal strip is bent to form the guide tube with opposite lengthwise edges joined by the seam.

7. The hand-held power tool as recited in claim 1 wherein the metal strip is bent to form the guide tube with opposite lengthwise edges joined by the positive fit created by the teeth.

8. The hand-held power tool as recited in claim 7 wherein the teeth widen in a direction of the lengthwise edges and interlock to form the positive fit.

9. The hand-held power tool as recited in claim 7 wherein the teeth are additionally sealed by welding, soldering or gluing.

Assignees

• Fuenfer Josef
• Hilti Ag

Inventors

• Fuenfer Josef

Classifications

• B25D2250/035

  Bleeding holes, e.g. in piston guide-sleeves · CPC title

• B25D2250/065

  Details regarding assembling of the tool · CPC title

• B21C37/08

  Making tubes with welded or soldered seams {(with helically arranged seams B21C37/122)} · CPC title

• B21C37/0815

  without continuous longitudinal movement of the sheet during the bending operation · CPC title

• Y10T29/49826

  Assembling or joining · CPC title