Expansion chuck

Patent metadata

Field	Value
Publication number	US-9839964-B2
Application number	US-201514739537-A
Country	US
Kind code	B2
Filing date	Jun 15, 2015
Priority date	Jun 17, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

Expansion chuck ( 1 ) with a base body ( 9 ) and an expansion sleeve ( 10 ) which is surrounded by a receptacle ( 6 ) for a tool, wherein the expansion sleeve ( 10 ) inside the base body ( 9 ) and at the front end ( 3 ) of the receptacle ( 6 ) is connected pressure-tight to the base body ( 9 ), thus forming a pressure chamber ( 11 ) between the base body ( 9 ) and the expansion sleeve ( 10 ), characterized in that the expansion sleeve ( 10 ) at the front end ( 3 ) of the base body ( 9 ) extends radially outward to an connecting section ( 34 ), where it is connected to the base body ( 9 ) in a pressure-tight manner.

First claim

The invention claimed is:

1. An expansion chuck comprising a base body; and an expansion sleeve surrounding a receptacle for a tool, wherein the expansion sleeve is inside the base body and is connected pressure-tight at a front end of the receptacle, thus forming a pressure chamber between the base body and the expansion sleeve, wherein the expansion sleeve at a front end of the base body extends radially outward to a connecting section, where it is connected to the base body in a pressure-tight manner; and wherein an annular gap extends beyond the pressure chamber in a direction of the front end of the base body.

2. The expansion chuck as claimed in claim 1 , wherein the expansion sleeve has a cylindrical clamping section and a transition segment extending radially outward starting from the latter, and wherein a wall thickness of the transition segment roughly corresponds to a wall thickness of the clamping section.

3. The expansion chuck as claimed in claim 2 , wherein the transition segment is realized as a bend.

4. The expansion chuck as claimed in claim 3 , wherein a radius of the bend is greater than 1 mm.

5. The expansion chuck as claimed in claim 4 , wherein the radius of the bend is between 1 and 2 mm.

6. The expansion chuck as claimed in claim 2 , wherein the transition segment has a greater wall thickness than the clamping section.

7. The expansion chuck as claimed in claim 1 , wherein the expansion sleeve is formed as one piece with the base body.

8. The expansion chuck as claimed in claim 1 , wherein the expansion sleeve is realized as a separate component that is connected to the base body in a pressure-tight manner.

9. The expansion chuck as claimed in claim 8 , wherein the expansion sleeve is a machined component.

10. The expansion chuck as claimed in claim 8 , wherein the expansion sleeve is a plastically deformed component.

11. The expansion chuck as claimed in claim 8 , wherein an end face of the base body is furnished with a groove or a ledge, so that a soldering ring can be arranged during assembly.

12. The expansion chuck of claim 8 , wherein the expansion sleeve is connected to the base body by soldering.

13. The expansion chuck as claimed in claim 1 , wherein an outer clamping point of the expansion sleeve, at which the latter can engage with a tool, is located within the area of the pressure-tight connection to the base body or even outside of this area.

14. The expansion chuck as claimed in claim 1 , wherein the expansion sleeve extends up to an outer side of the base body.

15. The expansion chuck as claimed in claim 1 , wherein an outer clamping point of the expansion sleeve, at which the latter can engage with a tool, is located inside the expansion chuck and less than 3 mm from the front end of the expansion chuck.

16. The expansion chuck of claim 15 , wherein the outer clamping point is located inside the expansion chuck and is less than 2 mm from the front end of the expansion chuck.

17. The expansion chuck of claim 15 , wherein the outer clamping point is located inside the expansion chuck and is less than 1.5 mm from the front end of the expansion chuck.

Assignees

• Kennametal Inc

Inventors

• Herud Josef K

Classifications

• Y10T279/1283

  Fluid pressure directly moves jaws · CPC title

• Y10T279/1241

  Socket type · CPC title

• Y10T279/1216

  Jaw is expansible chamber; i.e., bladder type · CPC title

• B23B31/305 Primary

  the gripping means is a deformable sleeve · CPC title