Tool holder for clamping an insert holder

• US 8,246,277 B2
• Filed: 11/05/2009
• Issued: 08/21/2012
• Est. Priority Date: 12/03/2008
• Status: Active Grant

• Current Assignee: Iscar Limited (Berkshire Hathaway Incorporated)
• Original Assignee: Iscar Limited (Berkshire Hathaway Incorporated)
• Inventors: Hecht, Gil
• Primary Examiner(s): Fridie, Jr., Will
• Application Number:
  US12/613,226
• Publication Number:
  US 20100135736A1
• Time in Patent Office: 1,020 Days
• Field of Search: 407/47, 407/49, 407/85, 407/86, 407/87, 407/88, 407/91, 407/94, 407/106, 407/107, 407/108
• US Class Current: 407/87
• CPC Class Codes: B23B 27/04 Cutting-off tools B23B27/08 takes precedence ; toolholders for cutting-off inserts B23B29/043
• CPC Class Codes: B23B 27/08 Cutting tools with blade- or disc-like main parts with disc-like main parts B23B27/083
• CPC Class Codes: B23B 29/043 with cutting-off, grooving or profile cutting tools, i.e. blade- or disc-like main cutting parts B23B29/14 takes precedence
• CPC Class Codes: Y10T 407/2238 by adjustable or replaceable stop
• CPC Class Codes: Y10T 407/224 Adjustable
• CPC Class Codes: Y10T 407/2242 Screw
• CPC Class Codes: Y10T 407/227 with separate means to fasten tool seat to holder

Abstract

A tool holder for clamping an insert holder has a main block, two clamping members and a single adjustment member. The main block has a longitudinal side surface with a longitudinal groove with upper and lower walls. The two clamping members include mirror symmetrical left and right clamping members interfacing with two inclined non-parallel planar ramping surfaces of the lower wall of the longitudinal groove. A blade-shaped insert holder is mounted in the longitudinal groove on the two clamping members. The adjustment member interfaces with the two clamping members, and when rotated causes each clamping member to move up its respective non-parallel planar ramping surface, decreasing the distance between the two clamping members and the upper wall of the longitudinal groove until a clamping force is uniformly applied between the insert holder and the upper wall of the longitudinal groove.

Claims

1. A tool holder comprising:

a main block having a longitudinal side surface with a longitudinal groove with opposing first and second walls;

two wedge shaped clamping members, supported by the second wall of the longitudinal groove; and

a single adjustment member operatively connected to each of the two clamping members;

wherein the two clamping members clamp a blade shaped insert holder against the first wall of the longitudinal groove.

2. The tool holder according to claim 1, wherein the main block has mirror symmetry about a central plane perpendicular to the longitudinal side surface.

3. The tool holder according to claim 2, wherein the longitudinal groove has a dovetail shape when viewed in the direction of the central plane.

4. The tool holder according to claim 2, wherein the longitudinal groove has a height dimension which increases towards the central plane.

5. The tool holder according to claim 1, wherein the first wall has a single planar surface and the opposing second wall has two non-parallel planar ramping surfaces.

6. The tool holder according to claim 1, wherein the two clamping members are non-identical.

7. The tool holder according to claim 1, wherein the single adjustment member has a generally cylindrical shape and comprises threads of opposite hand.

8. The tool holder according to claim 1, wherein the single adjustment member has a frustoconical shape and comprises a peripheral contact surface.

9. The tool holder according to claim 1, wherein the two clamping members each have a wedge angle between a support surface and a clamping surface.

10. The tool holder according to claim 9, wherein the support surfaces of the two clamping members interface with the second wall of the longitudinal groove.

11. The tool holder according to claim 9, wherein the clamping surfaces of the two clamping members interface with the insert holder.

12. The tool holder according to claim 9, wherein the single adjustment member has a central axis parallel with the clamping surfaces of the two clamping members.

13. The tool holder according to claim 9, wherein the clamping surfaces of the two clamping members each have a longitudinal edge of length L, parallel to the first wall of the longitudinal groove.

14. The tool holder according to claim 13, wherein the longitudinal edges are co-linear.

15. The tool holder according to claim 13, wherein the longitudinal groove of the main block has a length approximately equal to 2L.

16. The tool holder according to claim 13, wherein the two clamping members each have an adjustment surface adjacent their respective support surfaces and clamping surfaces, and

wherein a distance between the longitudinal edges of the clamping surfaces and the first wall of the longitudinal groove is inversely proportional to a distance between the adjustment surfaces of the two clamping members.

17. The tool holder according to claim 1, wherein the single adjustment member has a central axis, and

wherein a distance between the two clamping members is increased by rotation of the adjustment member in one direction about its central axis and decreased by rotation of the adjustment member in an opposite direction about its central axis.

18. The tool holder according to claim 1, wherein the single adjustment member has a central axis, and

wherein a distance between the two clamping members is increased by rotation of the adjustment member about its central axis.

19. A method of clamping a blade shaped insert holder in a tool holder, the tool holder comprising:

a main block having a longitudinal side surface with a longitudinal groove with opposing first and second walls;

two wedge shaped clamping members, supported by the second wall of the longitudinal groove; and

a single adjustment member interfacing with each of the two clamping members,

the method comprising the steps of;

mounting the insert holder in the longitudinal groove to interface with the two clamping members; and

rotating the adjustment member to cause movement of each clamping member up a respective inclined non-parallel planar ramping surface of the second wall of the longitudinal groove, until a distance between the two clamping members and the first wall of the longitudinal groove is decreased to a point wherein a clamping force is applied between the insert holder and the first wall of the longitudinal groove.

20. A tool holder comprising:

a main block having a first wall spaced apart from a second wall, the first wall facing in a direction of the second wall, the second wall comprising first and second ramping surfaces which extend away from each other and towards the first wall;

left and right clamping members supported by the first and second ramping surfaces, respectively, the left and right clamping members having respective first and second clamping surfaces which face in a direction of the first wall; and

an adjustment member operatively connected to both clamping members;

wherein;

the left and right clamping members are configured to travel along the first and second ramping surfaces and thereby adjust a distance between their clamping surfaces and the first wall, in response to operation of the adjustment member.

21. The tool holder according to claim 20, wherein:

The left and right clamping members each have an adjustment surface, with the adjustment surface of the left clamping member facing the adjustment surface of the right clamping member; and

the adjustment member comprises threads of opposite hand which are operatively connected to the adjustment surfaces of the left and right clamping members.

22. The tool holder according to claim 20, wherein:

the left and right clamping members each have an adjustment surface, with the adjustment surface of the left clamping member facing the adjustment surface of the right clamping member; and

the adjustment member has a frustoconical shape and comprises a peripheral contact surface which is operatively connected to the adjustment surfaces of the left and right clamping members.

23. The tool holder according to claim 20, wherein:

the left and right clamping members each have a support surface which abuts a corresponding ramping surface; and

the left and right clamping members are both wedge shaped, each clamping member having an acute wedge angle between its support surface and its clamping surface.

24. The tool holder according to claim 20, wherein:

each clamping member is provided with a retaining slot; and

a retaining pin or retaining screw removably fixed to the main block interfaces with the retaining slot to help ensure that an associated clamping member remains supported by its corresponding ramping surface.

25. The tool holder according to claim 20, further comprising:

an insert holder clamped between the first wall and the clamping surfaces of the left and right clamping members.