Hand-held power tool with a torque cut-off device

• US 20040069511A1
• Filed: 07/02/2003
• Published: 04/15/2004
• Est. Priority Date: 07/03/2002
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Spielmann, David, Breitenmoser, Armin, Laube, Christian
• Granted Patent: US 6,843,141 B2
• Time in Patent Office: Days
• US Class Current: 173/5
• CPC Class Codes: B25B 23/141 Mechanical overload release couplings
• CPC Class Codes: G01L 5/24 for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed

Abstract

A hand-held power tool includes a torque cut-off device (2) for presetting a torque of the driving shaft (3) of the hand-held power tool and formed as a control device (4) having a rotatable control sleeve (5) including a control cam (6) having at least two cam sections (6a, 6b), and a control element (7) secured in the housing (1) of the power tool without a possibility of rotation but with a possibility of an axial displacement relative to a rotational axis (D) of the control sleeve (5) and having at least two probing sections (8a, 8b) cooperating with respective cam sections (6a, 6b) for presetting the torque.

Claims

1. A hand-held power tool, comprising a housing (1);

a motor-driven shaft (3) for driving a working tool and extending in the housing (1); and

a torque cut-off device (2) for presetting a torque of the driving shaft (3) and having a control device (4), the control device (4) having a rotatable control sleeve (5) with a control cam (6) having at least two cam sections (6a, 6b) and a control element (7) secured in the housing (1) without a possibility of rotation but with a possibility of an axial displacement relative to a rotational axis (p) of the control sleeve (5) and including at least two probing sections (8a, 8b) cooperating with respective cam sections (6a, 6b) for presetting the torque of the driving shaft.

2. A hand-held power tool according to claim 1, wherein the cam sections (6a, 6b) extend, respectively, about the rotational axis (D) of the control sleeve (5) over an angle of 360°

.

3. A hand-held power tool according to claim 1, wherein the cam sections (6a, 6b) are formed as annular sections coaxial with each other and are arranged about the rotational axis (D).

4. A hand-held power tool according to claim 1, wherein cam sections (6a, 6b) act parallel to a longitudinal direction (L) of the shaft (3).

5. A hand-held power tool according to claim 1, wherein the probing sections (8a, 8b) of the control element (6) are located opposite each other and contact the respective cam sections (6a, 6b) of the control cam (6).

6. A hand-held power tool according to claim 5, wherein the control element (7) has a connection portion (9) supported about the rotational axis (D) for supporting the probing sections (8a, 8b).

7. A torque cut-off device (2) for presetting a torque of a driving shaft (3) of a hand-held power tool, comprising a control device (4) having a rotatable control sleeve (5) with a control cam (6) having at least two cam sections (6a, 6b), and a control element (7) secured in a housing (1) of the hand-held tool without a possibility of rotation but with a possibility of an axial displacement relative to a rotational axis (D) of the control sleeve (5) and including at least two probing sections (8a, 8b) cooperating with respective cam sections (6a, 6b) for presetting the torque.