Safety module for a multifunctional handheld tool

• US 6,843,140 B2
• Filed: 08/18/2003
• Issued: 01/18/2005
• Est. Priority Date: 08/19/2002
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Hellmann, Peter, Osselmann, Claus, Groer, Stefan
• Primary Examiner(s): NOORI, MAX H
• Application Number:
  US10/643,231
• Publication Number:
  US 20040104034A1
• Time in Patent Office: 519 Days
• Field of Search: 738/620.8, 244/17.19
• US Class Current: 73/862.08
• CPC Class Codes: B25D 16/00 Portable percussive machines with superimposed rotation , the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit combined percussion and rotary drilling adapted for earth drilling E21B6/00
• CPC Class Codes: B25F 5/00 Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Abstract

A multifunction handheld tool machine having an at least partially axially percussive tool receptacle (7), a safety coupling (8) disposed in the power line between the tool receptacle and an electrical motor (6), a hand-guided housing and an ATC safety module (1) with a rotational sensor (3) sensitive to an angular displacement. The ATC safety module (1) is connected to an axial displacement sensor (4) and, in the event of exceeding an axial limit value (13b), the binary control signal (5) is suppressed by the axial displacement.

Claims

1. A multifunction handheld tool machine having an at least partially axially percussive tool receptacle (7), a safety coupling (8) disposed in a power line between the tool receptacle (7) and an electrical motor (6), a hand-guided housing and an ATC safety module (1) with a rotational sensor (3) sensitive to an angular displacement, wherein the ATC safety module (1) is connected to an axial displacement sensor (4).

2. A control process for an ATC safety module (1) of a multifunction handheld tool machine having an at least partially axially percussive tool receptacle (7), a safety coupling (8) disposed in a power line between the tool receptacle (7) and an electrical motor (6), a hand-guided housing, wherein the ATC safety module (1) has a rotational sensor (3) sensitive to an angular displacement and the ATC safety module (1) is connected to an axial displacement sensor (4), comprising, in a first step, a rotary displacement of the housing is detected, and in a second step, a binary control signal (5) is generated that upon exceeding a rotary limit value (12a) by virtue of the rotary displacement reliably interrupts the power flow between the electrical motor (6) and the tool receptacle (7), wherein in the first step, the axial displacement of the housing is detected and, in the second step, the binary control signal (5) upon exceeding an axial limit value (13b) is suppressed by the axial displacement.

3. The control process of claim 2, wherein in the second step, a binary rotational control signal (14a) and a binary axial control signal (14b) are generated that generate the binary control signal (5) over a logical AND connection.

4. The control process of claim 3, wherein the axial displacement detected in the first step is integrated twofold in time.