Sealing lip on tool fitting

Patent metadata

Field	Value
Publication number	US-12454015-B2
Application number	US-202017619775-A
Country	US
Kind code	B2
Filing date	Jun 30, 2020
Priority date	Jul 11, 2019
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

Tool fitting device for a power tool, in particular a chipping hammer, including—a holding device for receiving and holding a tool shank, a retention element extending at least around a section or sections of the holding device, and a dust protection device for preventing the penetration of dust into the tool fitting device. The dust protection device includes at least one first dust stripping element, at least one fixing bead, and at least one sealing lip element, wherein the sealing lip element is positioned in front of the retention element in the axial direction. Dust protection device for use in a tool fitting device.

First claim

What is claimed is:

1. A tool fitting device for a power tool, the tool fitting device comprising:
a holder for receiving and holding a tool shank;
a retainer extending at least around a section or sections of the holder; and
a dust protector for preventing the penetration of dust into the tool fitting device, the dust protector including at least one first dust stripper, at least one fixing bead having a radial length configured to extend radially into the holder, and at least one sealing lip, the sealing lip being positioned in front of the retainer in the axial direction, the sealing lip bearing against a surface of the holder, wherein the sealing lip is configured with respect to the fixing bead so as to define a free space between the fixing bead and the sealing lip along the outer surface of the holder, the holder not extending into the free space.

2. The tool fitting device as recited in claim 1 further comprising a second dust stripper, the first and the second dust strippers being arranged at a distance from one another along an axial longitudinal axis.

3. The tool fitting device as recited in claim 1 wherein the dust protector and the holder are arranged relative to one another in such a way that a distance along an axial longitudinal axis is provided between one end of the at least one dust stripper and one end of the holder.

4. The tool fitting device as recited in claim 1 wherein the sealing lip includes a cross-sectional area tapering in the radial direction.

5. The tool fitting device as recited in claim 1 wherein the sealing lip includes a concave side face directed toward the retainer.

6. The tool fitting device as recited in claim 1 wherein the fixing bead has a trapezoidal cross-sectional area.

7. A method for a tool fitting device as recited in claim 1 comprising fitting the dust protector onto the holder.

8. A chipping hammer comprising the tool fitting device as recited in claim 1 .

9. The tool fitting device as recited in claim 1 wherein a subregion of the sealing lip pressed onto the surface of the holder is between 1/10 and 5/10 of a total length of the sealing lip in the axial direction.

10. The tool fitting device as recited in claim 9 wherein the total length of the sealing lip in the axial direction is 10 mm.

11. The tool fitting device as recited in claim 1 wherein a subregion of the sealing lip pressed onto the surface of the holder is 3/10 of a total length of the sealing lip in the axial direction.

12. The tool fitting device as recited in claim 11 wherein the total length of the sealing lip in the axial direction is 10 mm.

13. The tool fitting device as recited in claim 1 wherein the retainer is a snap ring.

14. The tool fitting device as recited in claim 13 wherein the snap ring rests in a groove on the holder.

15. The tool fitting device as recited in claim 1 wherein the fixing bead has a free end inserted in an annular groove of the holder.

16. The tool fitting device as recited in claim 15 wherein the fixing bead has a trapezoidal cross section with an obliquely rising end face facing toward the sealing lip.

Assignees

• Hilti Ag

Inventors

• Hauptmann Udo
• Mandel Ulrich

Classifications

• B23B2231/28

  Dust covers · CPC title

• Y10T279/3493

  Protection means; e.g., cover, seal, overstress prevention, air blast · CPC title

• Y10T279/17076

  Spreading elements · CPC title

• B25D2250/365

  Use of seals · CPC title

• B25D2217/0069

  Protecting chucks against entering of chip dust · CPC title