Chisel holder

Patent metadata

Field	Value
Publication number	US-9719348-B2
Application number	US-201514863522-A
Country	US
Kind code	B2
Filing date	Sep 24, 2015
Priority date	Dec 3, 2010
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

The invention relates to a bit holder for an earth working machine, in particular a road milling machine, having a support member onto which an insertion projection is indirectly or directly attached on an insertion projection side, the support member comprising two first and/or two second stripping surfaces that are at an angle to one another, and the support member having a working side that comprises a bit receptacle. In order to achieve a stable and long-lived configuration for such a bit holder, provision is made according to the present invention that the first and/or second stripping surfaces diverge from the insertion projection side toward the working side.

First claim

The invention claimed is:

1. A tool system for an earth working machine, comprising:
a base part including an insertion receptacle, two first support surfaces at a non-parallel angle to one another, and two second support surfaces at a non-parallel angle to one another and to the first support surfaces; and
a tool apparatus including:
an insertion projection received in the insertion receptacle of the base part; and
a support member integrally formed with the insertion projection and having an insertion projection side and a working side, the insertion projection extending from the insertion projection side, the working side facing away from the insertion projection, the support member including:
two first bearing surfaces at a first angle to one another, the two first bearing surfaces diverging from the insertion projection side toward the working side, each of the first bearing surfaces engaging a respective one of the first support surfaces; and
two second bearing surfaces at a second angle to one another, the two second bearing surfaces diverging from the insertion projection side toward the working side, each of the second bearing surfaces engaging a respective one of the second support surfaces.

2. The tool system of claim 1 , wherein:
the insertion receptacle of the base part extends downwardly relative to the support surfaces;
the support surfaces of the base part all face upwardly; and
the bearing surfaces of the tool apparatus all face downwardly.

3. The tool system of claim 1 , wherein:
the working side includes a bit receptacle;
the two first bearing surfaces are generally on a first side of the bit receptacle with reference to a tool advance direction, and the two second bearing surfaces are generally on a second side of the bit receptacle with reference to the tool advance direction; and
lines normal to and projecting outward from the two first bearing surfaces point in the tool advance direction and lines normal to and projecting outward from the two second bearing surfaces point away from the tool advance direction.

4. The tool system of claim 1 , wherein:
the first angle is in a range of from 100° to 120°; and
the second angle is in a range of from 120° to 140°.

5. The tool system of claim 1 , wherein:
the two first bearing surfaces are connected to each other at least partly on the insertion projection side by a first transition segment; and
the two second bearing surfaces are connected to each other at least partly on the insertion projection side by a second transition segment.

6. The tool system of claim 1 , wherein:
the insertion projection is attached to the insertion projection side of the support member at least partially in a region of the two first bearing surfaces and the two second bearing surfaces.

7. The tool system of claim 1 , wherein:
the insertion projection has a longitudinal insertion axis;
planes defined by the two first bearing surfaces intersect at a first longitudinal center bearing axis;
planes defined by the two second bearing surfaces, intersect at a second longitudinal center bearing axis;
the longitudinal insertion axis and the first longitudinal center bearing axis enclose an angle in a range of from 100° to 130°; and
the longitudinal insertion axis and the second longitudinal center bearing axis enclose an angle in a range of from 100° to 130°.

8. The tool system of claim 1 , wherein:
the two first bearing surfaces are arranged at least partly in front of the insertion projection with reference to a tool advance direction; and
the two second bearing surfaces are arranged at least partly behind the insertion projection with reference to the tool advance direction.

9. The tool system of claim 1 , wherein:
the support member includes a front-side skirt with reference to a tool advance direction; and
the two first bearing surfaces at least partly form an underside of the front-side skirt.

10. The tool system of claim 1 , wherein:
the support member includes a rearward support projection with reference to a tool advance direction; and
the two second bearing surfaces at least partly form an underside of the rearward support projection.

11. The tool system of claim 1 , wherein:
the working side includes a bit receptacle; and
the bit receptacle includes a longitudinal center receptacle axis arranged between the two first bearing surfaces and between the two second bearing surfaces.

12. The tool system of claim 1 , wherein:
the working side includes a bit receptacle;
the bit receptacle has a longitudinal center receptacle axis;
planes defined by the two first bearing surfaces intersect at a first longitudinal center bearing axis; and
the longitudinal center receptacle axis and the first longitudinal center bearing axis enclose an enclosed angle in a range of from 40° to 60°.

13. The tool system of claim 12 , wherein:
the enclosed angle is in a range of from 45° to 55°.

14. The tool system of claim 1 , wherein:
the working side includes a bit receptacle;
the bit receptacle has a longitudinal center receptacle axis;
planes defined by the two second bearing surfaces intersect at a second longitudinal center bearing axis; and
the longitudinal center receptacle axis and the second longitudinal center bearing axis enclose an enclosed angle in a range of from 70° to 90°.

15. The tool system of claim 14 , wherein:
the enclosed angle is in a range of from 75° to 85°.

16. The tool system of claim 1 , wherein:
the working side includes a bit receptacle;
the support member further includes a flushing conduit defined therein;
the bit receptacle transitions into the flushing conduit; and
the flushing conduit emerges at least partly in a region between the two second bearing surfaces.

17. The tool system of claim 1 , wherein:
the two first bearing surfaces form a first bearing surface pair, planes of the two first bearing surfaces being incident in a V-shape; and
the two second bearing surfaces form a second bearing surface pair, planes of the two second bearing surfaces being incident in a V-shape.

18. The tool system of claim 17 , wherein:
a plane of one of the first bearing surfaces and a plane of one of the second bearing surfaces intersect to define an angle in a range of from 120° to 160°.

19. The tool system of claim 17 , wherein:
the insertion projection has a longitudinal insertion axis, and the longitudinal insertion axis is at an angle of from −10° to +10° with respect to an angle bisector plane of the two first bearing surfaces.

20. The tool system of claim 1 , wherein:
lines normal to the two first bearing surfaces and the two second bearing surfaces are all inclined relative to a tool advance direction.

21. The tool system of claim 1 , wherein:
an angle bisector plane bisects the first angle and the second angle, and the insertion projection is symmetrical about the angle bisector plane.

22. The tool system of claim 1 , wherein:
at least 80% of a region of attachment of the insertion projection to the support member intersects with the first pair of bearing surfaces.

Assignees

• Wirtgen Gmbh

Inventors

• Lehnert Thomas
• Buhr Karsten
• Barimani Cyrus
• Hähn Günter
• Kammerer Karl
• Roth Markus
• Diessner Bernhard

Classifications

• E21C35/19 Primary

  Means for fixing picks or holders · CPC title

• E21C35/1933

  the picks having a cylindrical shank · CPC title

• E21C35/193

  using bolts as main fixing elements · CPC title

• E21C35/18 Primary

  Mining picks; Holders therefor (planing knives E21C27/44) · CPC title

• E21C2035/191

  Fixed Constructions · mapped topic