Interface between a collet holder and a tool adapter

• US 11,135,657 B2
• Filed: 08/14/2018
• Issued: 10/05/2021
• Est. Priority Date: 08/25/2017
• Status: Active Grant

• Current Assignee: WTO Vermoegensverwaltung GmbH
• Original Assignee: WTO Vermoegensverwaltung GmbH
• Inventors: Fautz, Tobias, Tschiggfrei, Sascha, Jansen, Karlheinz
• Primary Examiner(s): Gates, Eric A.
• Assistant Examiner(s): Su, Chwen-Wei
• Application Number:
  US16/636,450
• Publication Number:
  US 20210178491A1
• Time in Patent Office: 1,148 Days
• CPC Class Codes: B23B 2231/04 Adapters
• CPC Class Codes: B23B 2231/24 Cooling or lubrication means
• CPC Class Codes: B23B 31/006 Conical shanks of tools
• CPC Class Codes: B23B 31/1076 with conical ends
• CPC Class Codes: B23B 31/2012 Threaded cam actuator

Abstract

The invention relates to an interface between a collet holder and a tool adapter, said interface being simple in construction and in which the insertion of a tool adapter is possible in a simple manner even in confined spaces.

Claims

1. Interface between a collet holder (300) and a tool adapter (500-504), the collet holder (300) comprising an inner cone (310), a flat surface (311), and an outer thread (230) for a tensioning nut (401), wherein the tool adapter (500-504) comprises an outer cone (320) which complements the inner cone (310), and the collet holder (300) has securing means, which are independent of the outer thread (230) and the tensioning nut (401), for the tool adapter (500-504), wherein the securing means comprise one or more radially or diagonally arranged inner threads (315) and a tensioning pin (210) in each inner thread (315), and wherein in the tool adapter (500-504) there are one or more recesses (317) which interact with the tensioning pin(s) (210) characterized in that the tool adapter (500-504) has a collar (321), that the tool adapter (500-504) and the collet holder (300) can be connected in a form-locking manner to one another in the area of the flat surface (311) and the collar (321), that the collet holder (300) has one or more grooves (221, 221.1, 221.2) in the area of the flat surface (311), that the tool adapter (500-504) has one or more grooves (223, 223.1, 223.2) in the area of the collar (321), that the interface comprises a driver ring (220), and that the driver ring (220) has at least one form-locking element (222), which is compatible with the grooves (221, 221.1, 221.2, 223, 223.1, 223.2) in the area of the flat surface (311) and in the area of the collar (321).

2. Interface according to claim 1, characterized in that the grooves (221, 221.1, 221.2) in the area of the flat surface (311) and the grooves (223, 223.1, 223.2) in the area of the collar (321) have different dimensions, shapes, and/or positions.

3. Interface according to claim 1, characterized in that the driver ring (220) covers the outer thread (230) of the collet holder (300).

4. Interface according to claim 1, characterized in that the driver ring (220) has at least one radial or inclined through bore (225), and that the at least one through bore (225) is positioned in such a way that it allows access to the tensioning pin(s) (210) with a screwdriver.

5. Interface according to claim 4, characterized in that a minimum diameter (D_min) of the through bore (225) is so large that a screwdriver for tightening and loosening the at least one tensioning pin (210) can be inserted into the through bore (225), and that the minimum diameter (D_min) of the through bore (225) is smaller than a nominal diameter of the at least one tensioning pin (210).

6. Interface according to claim 4, characterized in that the at least one through bore (225) on the inside of the driver ring (220) has a chamfered, rounded, or frustoconical countersink (318).

7. Interface according to claim 1, characterized in that the at least one through bore (225) is designed as a stepped bore, that the stepped bore has a larger diameter on the inside of the driver ring (220) than on the outside of the driver ring (220), and that the diameter on the inside of the driver ring (220) is larger than the nominal diameter of the tensioning pin(s) (210).

8. Interface according to claim 1, characterized in that the collet holder (300) has one or more projections in the area of the flat surface (311) and the tool adapter (500-504) in the area of the collar (321) has one or more recesses that are complementary to the projections.

9. Interface according to claim 8, characterized in that the projections in the area of the flat surface (311) and the recesses in the area of the collar (321) are dimensioned, shaped, and/or positioned differently.

10. Interface according to claim 1, characterized in that the tool adapter (500-504) has one or more projections in the region of the collar (321) and the collet holder (300) in the region of the flat surface (311) has recesses which are complementary to the projections.

11. Interface according to claim 1, characterized in that the tool adapter (500-504) and the collet holder (300) can be connected to one another in a form-locking manner at an end of the inner cone (310) opposite the flat surface.

12. Interface according to claim 11, characterized in that the tool adapter (500-504) and the collet holder (300) can be connected to one another in a form-locking manner by means of a polygon connection.

13. Interface according to claim 11, characterized in that the form-locking connection is designed in the manner of a claw coupling.

14. Interface according to claim 11, characterized in that the form-locking connection in the area of the collet holder (300) and the collar (321) and/or at an end of the inner cone (310) opposite the flat surface (311) predetermines the relative position of the tool adapter (500-504) and tool holder (300) constructively such that the at least one recess (317) and the at least one tensioning pin (210) interact with one another.

15. Interface according to claim 11, characterized in that the form-locking connection in the area of the collet holder (300) and the collar (321) has a larger rotational play than the form-locking connection at the end of the inner cone (310) opposite the plane surface (311).

16. Interface according to claim 11, characterized in that the form-locking connection in the area of the collet holder (300) and the collar (321) has a smaller rotational play than the form-locking connection at the end of the inner cone (310) opposite the plane surface (311).

17. Interface according to claim 1, characterized in that a nominal diameter (D_nominal) of the outer thread (230) is at least 1.4 times greater than the largest diameter (D_max) of the inner cone (310).

18. Interface according to claim 17, wherein the nominal diameter (D_nominal) of the outer thread (230) is 1.5 to 1.8 times greater than the largest diameter (D_max) of the inner cone (310).

19. Interface according to claim 1, characterized in that the collet holder (300) is integrated in a driven tool mount (600) for a Swiss-type automatic lathe, or a fixed tool mount (700).

20. Interface according to claim 1, characterized in that one or more grooves (326) are present on the outer cone (320) of the tool adapter (500-504).

21. Interface according to claim 1, characterized in that the tensioning pin(s) (210) have a frustoconical tip (316).

22. Interface according to claim 1, characterized in that the tensioning pin(s) (210) have a tip which is arranged eccentrically to an outer thread of the tensioning pin (210).