Percussion electrical hand-held tool

• US 6,799,643 B2
• Filed: 12/12/2002
• Issued: 10/05/2004
• Est. Priority Date: 12/12/2001
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Voulkidis, Orestis, Boni, Hans
• Primary Examiner(s): Sipos, John
• Assistant Examiner(s): TRAN, LOUIS B
• Application Number:
  US10/318,934
• Publication Number:
  US 20030116333A1
• Time in Patent Office: 663 Days
• Field of Search: 173/2, 173/4, 173/11, 173/201, 173/170, 173/162.2
• US Class Current: 173/170
• CPC Class Codes: B25D 11/00 Portable percussive tools with electromotor or other motor drive
• CPC Class Codes: B25D 17/043 Handles resiliently mounted relative to the hammer housing B25D17/046 takes precedence
• CPC Class Codes: B25D 2211/003 Crossed drill and motor spindles
• CPC Class Codes: B25D 2211/068 Crank-actuated impulse-driving mechanisms
• CPC Class Codes: B25D 2250/221 Sensors

Abstract

The present invention relates to a percussion electrical hand-held tool having an electronic control unit (5) for controlling at least one power parameter of the electrical tool, and a substantially flat force sensor for controlling operation of the electronic control unit (5) and arranged sliding displacement-free for sensing a press-on force (F, F¹) applied by a user in an operational direction of the electric tool, without being displaced, between at least two, associated with each other, press-surfaces (7a, 7b) extending at least partially transverse to a percussion axis (A) of the electrical tool.

Claims

1. A percussion electrical hand-held tool, comprising a percussion mechanism (2);

a handle (4);

electronic control means (5) for controlling at least one power parameter of the electrical tool; and

a force sensor (6, 6′

, 6″

) for controlling operation of the electronic control means (5) and which is formed as a hollow pneumatic force transmission member arranged, for sensing a press-on force (F, F¹) applied by a user in an operational direction of the electrical tool, free of sliding displacement, between at least two, associated with each other, press-surfaces (7a, 7b) extended at least partially transverse to a percussion axis (A) of the tool and arranged, with respect to a force flux, between the percussion mechanism (2) and a gripping surface (8) of the handle (4).

2. An electrical hand-held tool according to claim 1, wherein the force transmission member (17) is filled with one of an easily deformable pressure transmitting medium and a fluid pressure transmitting medium.

3. An electrical hand-held tool according to claim 1, further comprising an additional side handle (13) including a a further force sensor (6′

″

) formed as a hollow pneumatic force transmission number.

4. An electrical hand-held tool according to claim 1, wherein the force transmission member (17) is formed as one of a cushion and a hose.

5. An electrical hand-held tool according to claim 1, wherein the force sensor (6″

) is located in a front section of the tool behind an axial position of an electrical tool chuck (20).

6. An electrical hand-held tool according to claim 1, wherein the force transmission member has a length substantially corresponding to a length of the handle (4).

7. An electrical hand-held tool according to claim 1, wherein the press-surfaces (7a, 7b) are arranged in a region of a working tool-side axial position of the percussion mechanism (2) relative to a tool outer casing (9) of which the handle (4) forms a part.

8. An electrical hand-held tool according to claim 1, wherein the press-surfaces (7a, 7b) are arranged in a region of a modular pesitlefi-ef between a drive module (10) and a handle module (11) of which the handle (4) forms a part.

9. An electrical hand-held tool according to claim 1, wherein the press-surfaces (7a, 7b) are arranged between the handle (4) and a vibration-proof gripping casing (12).

10. An electrical hand-held tool according to claim 1, wherein the force sensor (6) is connected with a force sensing element (16).

11. An electrical hand-held tool according to claim 10, further comprising a low-pass filter (19) having a cut-off frequency of less than 30 Hz for connecting the force sensing element (16) with the electronic control means.

12. An electrical hand-held tool according to claim 1, wherein the force sensor (6) is provided in the handle (4), and wherein the tool further comprises a side handle (13), a further force sensor (6′

″

) formed as a hollow pneumatic force transmission member, and a connection hose (14) pneumatically connecting the further force sensor (6′

″

) with the force sensor (6) provided in the handle (4).

13. An electrical hand-held tool according to claim 1, wherein a dimension of the force sensor in a direction parallel to a plane of a press-surface (7a, 7b) is substantially greater than a dimension of the force sensor in a direction perpendicular to the plane of the force sensor (7a, 7b).