Striking-mechanism body, striking mechanism and handheld power tool with a striking mechanism

Patent metadata

Field	Value
Publication number	US-10201893-B2
Application number	US-201113294304-A
Country	US
Kind code	B2
Filing date	Nov 11, 2011
Priority date	Nov 12, 2010
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A striking-mechanism body of a handheld power tool at least a first part of the striking-mechanism body, having an impact surface and/or a lateral surface of a first material, and a second part of the striking-mechanism body of a second material, and the first material being more resistant than the second material in terms of at least one material characteristic, the striking-mechanism body being configured as a one-piece steel body so that the first material and the second material are the same, and the first material of the first part body undergoes a heat treatment that differs from that of the second material of the second part of the striking-mechanism body, or the first and the second materials are different, and the first and the second parts are joined together.

First claim

What is claimed is:

1. A method for manufacturing a striking-mechanism body of a striking mechanism of a handheld power tool having a lateral surface and an impact surface, a pulse transmittable to a pulse-receiving part via the striking mechanism, the striking mechanism body comprising: at least a first part having the impact surface and/or the lateral surface, the first part being made of a first material; and a second part being made of a second material; the striking-mechanism body being configured as a one-piece steel body, the first material and the second material being the same; the method comprising:
heat treating the first material of the first part of the striking-mechanism body with a heat treatment differing from that of the second material of the second part of the striking-mechanism body.

2. The method as recited in claim 1 wherein the first and second materials are joined at a joint by an adhesive force.

3. The method as recited in claim 1 wherein the heat treatment of the first part is a heat treatment that is selected from the group consisting of tempering, carburizing, nitriding, nitrocarburizing and combinations thereof.

4. The method as recited in claim 1 wherein the second part is tempered.

5. The method as recited in claim 1 wherein the first part of the striking-mechanism body includes shot blast, pelletized or deep rolled finished steel.

6. The method as recited in claim 1 wherein the first material and/or the second material is a steel that is selected from the group consisting of the following: case-hardened steel, tempered steel, tool steel, and hard steel.

7. The method as recited in claim 6 wherein the hard steel is manganese hard steel.

8. The method as recited in claim 2 wherein the joint is a steel-bonded joint.

9. The method as recited in claim 2 wherein the joint created by adhesive force is a weld joint.

10. The method as recited in claim 9 wherein the weld joint is created by friction-welding.

11. The method as recited in claim 10 wherein the friction welding is linear friction-welding, individual or multi-orbital friction-welding.

12. The method as recited in claim 2 wherein the joint created by adhesive force is a soldered joint.

13. The method as recited in claim 2 wherein the joint created by adhesive force is a glued joint.

14. The method as recited in claim 1 wherein the impact surface comprises a planar head surface and/or the lateral surface comprises a tapered cross-sectional area.

15. The method as recited in claim 1 wherein the striking mechanism body is a striker and/or a striking pin.

16. A striking mechanism comprising;
a drive acting to accelerate at least one movable striking-mechanism body manufactured according to the method as recited in claim 1 , the striking-mechanism body being configured as a striker and/or as a striking pin.

17. A handheld power tool comprising: a striking mechanism as recited in claim 16 ; and a shank receiving a pulse from the striking mechanism.

18. The method as recited in claim 1 wherein the first part has a greater hardness than the second part.

19. The method as recited in claim 1 wherein the first part has a lower modulus of elasticity than the second part.

20. The method as recited in claim 1 wherein the first part has a front carburized part and a rear carburized part, the second part being between the front carburized part and the rear carburized part.

21. The method as recited in claim 20 wherein the first part has a further tempered part between the rear carburized part and the second part.

22. The method as recited in claim 1 wherein the second part is not heat treated.

23. The method as recited in claim 1 wherein the second part is heat treated at a lower grade than the heat treatment of the first part.

Assignees

• Hauptmann Udo
• Stroissnigg Horst
• Hilti Ag

Inventors

• Hauptmann Udo
• Stroissnigg Horst

Classifications

• B25D2222/06

  Composite materials · CPC title

• B25D2217/0023

  Pistons · CPC title

• B25D2222/42

  Steel · CPC title

• B25D17/06 Primary

  Hammer pistons; Anvils {; Guide-sleeves for pistons} · CPC title