Tool holder for connecting a diamond drill to a drill bit

Patent metadata

Field	Value
Publication number	US-10207338-B2
Application number	US-201515328106-A
Country	US
Kind code	B2
Filing date	Jul 22, 2015
Priority date	Jul 22, 2014
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

The output shaft includes a locking ring and the union nut includes a washer disk, as well as an attenuator, the washer disk being positioned between the locking ring and the attenuator.

First claim

What is claimed is:

1. A device for holding and securing a tool, the device comprising:
an output shaft for transmitting a torque generated in a machine tool to the tool; and
a union nut positioned around the output shaft for detachably connecting the output shaft to an attachment end of the tool;
the output shaft including a locking ring and the union nut including a washer disk and an attenuator, the washer disk being positioned between the locking ring and the attenuator.

2. The device as recited in claim 1 , wherein in a connected state of the union nut with the attachment end of the tool, an inner surface of the union nut presses against the attenuator, the washer disk pressing in a force-fitting manner against the locking ring as result.

3. The device as recited in claim 1 , wherein the union nut includes an internal thread and the attachment end of the tool includes an external thread corresponding to the internal thread of the union nut, and wherein the union nut is configured to detachably connect the output shaft to the attachment end of the tool.

4. The device as recited in claim 1 , wherein the union nut is made of plastic.

5. The device as recited in claim 1 , wherein the locking ring and the washer disk are made of metal.

6. The device as recited in claim 1 , wherein the tool is a drill bit.

7. The device as recited in claim 1 , wherein the machine tool is a core drill.

8. The device as recited in claim 7 , wherein the core drill comprises an electric motor configured to generate the torque.

9. The device as recited in claim 2 , wherein in a connected state of the union nut with the attachment end of the tool, external toothing of the output shaft engages with internal toothing of the attachment end of the tool to form a non-rotatable connection.

10. The device as recited in claim 9 , wherein in a connected state of the union nut with the attachment end of the tool, the torque generated in the machine tool is transmitted to the tool via the union nut.

11. The device as recited in claim 1 , wherein the attenuator is an O-ring formed of an elastic material.

12. A method for operating a machine tool, comprising:
positioning a union nut around an output shaft of the machine tool for detachably connecting the output shaft to an attachment end of the tool;
engaging the union nut to the attachment end of the tool until a hard stop is reached between a locking ring of the output shaft and a washer disk of the union nut, wherein the washer disk is positioned between the locking ring and an attenuator of the union nut; and
generating a torque in the machine tool, and transmitting the torque from the output shaft of the machine tool to the tool via the engagement of the union nut to the attachment end of the tool.

13. The method as recited in claim 12 , further comprising engaging an internal thread of the union nut with an external thread of the attachment end of the tool to detachably connect the output shaft to the attachment end of the tool.

14. The method as recited in claim 12 , further comprising engaging external toothing of the output shaft with internal toothing of the attachment end of a tool to form a non-rotatable connection.

Assignees

• Hilti Ag

Inventors

• Reichenberger Thomas
• Ried Xaver

Classifications

• B23B2226/33

  Elastomers, e.g. rubber · CPC title

• B23B2260/106

  Nuts · CPC title

• B23B2226/61

  Plastics not otherwise provided for, e.g. nylon · CPC title

• F16D1/116

  the interengaging parts including a continuous or interrupted circumferential groove in the surface of one of the coupling parts (circlips for retaining hubs on shafts F16B21/18) · CPC title

• F16D2001/102

  the torque is transmitted via polygon shaped connections · CPC title