Device with ultrasound adapter

• US 6,731,047 B2
• Filed: 05/17/2001
• Issued: 05/04/2004
• Est. Priority Date: 05/23/2000
• Status: Active Grant

• Current Assignee: Sauer GmbH (Dmg Mori Co., Ltd.)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Tichy, Stefan, Wallaschek, Jörg, Littmann, Walter, Kauf, Adrian
• Primary Examiner(s): Dougherty, Thomas M.
• Application Number:
  US09/859,872
• Publication Number:
  US 20030001456A1
• Time in Patent Office: 1,083 Days
• Field of Search: 310/317, 310/323.17, 310/323.18
• US Class Current: 310/317
• CPC Class Codes: B06B 3/00 Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
• CPC Class Codes: B28D 1/041 with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
• CPC Class Codes: G10K 11/02 Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators

Abstract

A device for operating a tool has an ultrasound adapter with an capacitive electro-acoustic transducer (4) connected to an electrical ultrasonic frequency generator (8) for producing ultrasonic wave for a tool (2) driven by the device, wherein the capacitive electro-acoustic transducer (4) is connected with a secondary winding (5) and the ultrasonic frequency generator (8) is connected with a primary winding (7) of a transformer (6).

Claims

1. A device for driving a tool (2) comprising an ultrasonic adapter (1) including a capacitive electro-acoustic transducer (4), an electrical ultrasonic frequency generator (8) connected via a transformer (6) to said transducer (4) for producing an ultrasonic wave for said tool (2), said transducer (4) is connected to a secondary windup (5) of said transformer (6) and said ultrasonic frequency generator (8) is connected to a primary windup of said transformer (6), whereby said secondary windup (5) is nonrotationally connected with the tool (2) and rotatable with said transformer (6).

2. A device, as set forth in claim 1, wherein said capacitive electro-acoustic transducer (4) has resonant frequencies, said tool (2) has a secondary oscillating circuit and an amplitude of longitudinal oscillations, and the resonant frequencies of said transducer (4) and at least one of the secondary oscillating circuit and the amplitude of the longitudinal oscillations of the tool (2) are dimensioned tuned to one another with the frequency of the ultrasonic frequency generator (8).

3. A device, as set forth in claim 1, wherein at least one of the ultrasound adapters (1) and the tool (2) in dimensioned for a resonance frequency in the range front 20 to 35 KHz.

4. A device, as set forth in claim 1, having a part (3) for driving said tool (2), said part (3) and said tool having an axis (A), and said capacitive electro-acoustic transducer (4) in the direction of the axis (A) is disposed axially adjacent to said secondary winding (5).

5. A device, as set forth in claim 4, wherein relative to said axis (A) and radially outwardly therefrom said transformer (6) comprises an inner transformer core (11), the secondary winding (5), an annular air gap 12 said primary windings (7) and an outer transformer core (13).

6. A device, as set forth in claim 5, wherein said transformer (6) comprises two coils each within a pot core one forming said inner transformer core (11) and the other forming said outer transformer core (13), said pot cores each having an opening facing one another, each said pot core having a coil therein arranged non-rotational thereto, said primary winding (7) forming a stator of said transformer (6) and arranged non-rotational relation to said part (3), and said secondary windings (5) arranged as a rotor of said transformed (6) and being non-notational relative to said tool (2).

7. A device, as set forth in claim 4, wherein said transformer (6) comprises two pot cores each forming a separate transformer core nested one within the other and encircling said axis (A), one of said transformer cores arranged non-rotational relative to said part (3) and forming said primary coil (7) comprising a stator of said transformer (6) and the other one of transformer cores arranged non-rotational relative to said tool (2) and forming said secondary coil (5) comprising a rotor of said transformer (6).

8. A device, as set forth in claim 1, wherein said tool is arranged interchangeably with said integration capacitive electro-acoustic transducer (4) and said secondary winding (5) of said transformer (6).

9. A device, as set forth in claim 1, wherein said transformer (6) is arranged so that it can at least one of rotate and sway partially about said tool axis (A).

10. A device, as set forth in claim 9, wherein said transformer has an inner transformer core (11) and an outer transformer core (13), and the mass of the inner transformer can be used for balancing a swinging mechanical system of said device.

11. A device, as set forth in claim 5, wherein said inner transformer core (11) is formed of stratified lamellas electrically insulated from one another.

12. A device, as set forth in claim 2, wherein said capacitive electro-acoustic transducer (4) is disposed at a vibration node with respect to the amplitude of longitudinal oscillation of said tool (2).

13. A device, as set forth in claim 4, wherein at least one of said tool (2), said transformer (6) and said capacitive electro-acoustic transducer (4) is arranged as a hollow member encircling said axis (A).