Chisel holder for a soil treatment machine

Patent metadata

Field	Value
Publication number	US-9260965-B2
Application number	US-201213822917-A
Country	US
Kind code	B2
Filing date	Jun 28, 2012
Priority date	Jul 4, 2011
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

The invention relates to a bit holder for an earth working machine, in particular a road milling machine, that comprises a bit receptacle in the region of a working side of a support member and that indirectly or directly carries an insertion projection on an insertion projection side of the support member, the support member comprising two stripping surfaces [first or second stripping surfaces] that form a stripping surface pair and are at an angle to one another. In order to achieve a stable and long-lived configuration with such a bit holder, provision is made according to the present invention that the support member comprises at least one further stripping surface that is at an angle to the two stripping surfaces of the stripping surface pair.

First claim

The invention claimed is:

1. A tool apparatus for an earth working machine, comprising:
an insertion projection having a longitudinal projection center axis; and
a support member having an insertion projection side and a working side, the insertion projection extending from the insertion projection side, the support member including:
a pair of rear bearing surfaces at a non-parallel angle to one another, the rear bearing surfaces being at least partially located behind the insertion projection longitudinal center axis with reference to a tool advance direction; and
at least one front bearing surface at a non-parallel angle to each of the rear bearing surfaces, the at least one front bearing surface being at least partially located in front of the insertion projection longitudinal center axis with reference to the tool advance direction.

2. The apparatus of claim 1 , wherein:
the rear bearing surfaces, and the at least one front bearing surface all diverge from one another from the insertion projection side toward the working side.

3. The apparatus of claim 1 , wherein:
the apparatus has a central plane lying between the rear bearing surfaces and containing the longitudinal center projection axis; and
the at least one front bearing surface is symmetrical about the central plane of the apparatus.

4. The apparatus of claim 1 , where:
the support member includes a front-side skirt with a reference to the tool advance direction; and
the at least one front bearing surface at least partially forms an underside of the front-side skirt.

5. The apparatus of claim 1 , wherein:
the rear bearing surfaces and the at least one front bearing surface form a bracing guide having at least three bearing surfaces.

6. The apparatus of claim 1 , wherein:
the rear bearing surfaces enclose an angle in a range of from 100° to 140°.

7. The apparatus of claim 1 , wherein:
the rear bearing surfaces are connected to one another at least partially on the insertion projection side by a transition segment.

8. The apparatus of claim 1 , wherein:
the insertion projection is attached to the insertion projection side at least partly in a region of the rear bearing surfaces.

9. The apparatus of claim 1 , wherein:
planes defined by the rear bearing surfaces intersect at a longitudinal center bearing axis; and
the longitudinal center insertion axis and the longitudinal center bearing axis enclose an angle in a range of from 100° to 130°.

10. The apparatus of claim 1 , wherein:
the working side includes a bit receptacle; and
the bit receptacle defines a longitudinal center receptacle axis extending between the rear bearing surfaces.

11. The apparatus 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 partially in a region between the rear bearing surfaces.

12. The apparatus of claim 1 , wherein:
one of the rear bearing surfaces, and the at least one front bearing surface define planes intersecting at an angle in a range from 120° to 160° and form a supporting region.

13. The apparatus of claim 1 , wherein:
the longitudinal center projection axis is at an angle of from −10° to +10° with respect to an angle bisector plane of the rear bearing surfaces.

14. A tool system for an earth working machine, comprising:
a base part including an insertion receptacle defining an insertion axis, a pair of support surfaces at a non-parallel angle to one another and located at least partially behind the insertion axis with reference to a tool advance direction, and at least one further support surface at a non-parallel angle to each of the pair of support surfaces and located at least partially in front of the insertion axis with reference to the tool advance direction; and
a tool apparatus, including:
an insertion projection received in the insertion receptacle of the base part; and
a support member having an insertion projection side and a working side, the insertion projection extending from the insertion projection side, the support member including:
a pair of bearing surfaces at a non-parallel angle to one another, each of the bearing surfaces engaging a respective one of the pair of support surfaces; and
at least one further bearing surface at a non-parallel angle to each of the bearing surfaces of the pair of bearing surfaces, the at least one further bearing surface engaging the at least one further support surface.

15. A tool system, comprising:
a base part having a concave pyramid shaped support surface system defined thereon including at least three non-parallel support surfaces, the base part including an insertion receptacle; and
a tool apparatus including:
an insertion projection; and
a support member 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 a convex pyramid shaped bearing surface system defined on the insertion projection side, the convex pyramid shaped bearing surface system including at least three non-parallel bearing surfaces, the convex pyramid shaped bearing surface system being complementary to the concave pyramid shaped support surface system so that the convex pyramid shaped bearing surface system can be received in the concave pyramid shaped support surface system with each of the bearing surfaces engaging a respective one of the support surfaces when the insertion projection is received in the insertion receptacle.

16. The system of claim 15 , wherein:
the at least three non-parallel support surfaces comprises four non-parallel support surfaces; and
the at least three non-parallel bearing surfaces comprises four non-parallel bearing surfaces.

17. The system of claim 16 , wherein:
the four non-parallel bearing surfaces include a pair of front bearing surfaces arranged at a non-parallel angle to each other and a pair of rear bearing surfaces arranged at a non-parallel angle to each other.

18. The system of claim 17 , wherein:
the insertion projection has a longitudinal insertion axis;
the working side of the support member includes a bit receptacle having a longitudinal center receptacle axis;
the longitudinal insertion axis and the longitudinal center receptacle axis define a central plane of the tool apparatus;
the pair of front bearing surfaces are symmetric about the central plane; and
the pair of rear bearing surfaces are symmetric about the central plane.

Assignees

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

Inventors

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

Classifications

• E21C35/191

  for fixing holders · CPC title

• E21C35/1933

  the picks having a cylindrical shank · CPC title

• E21C35/19

  Means for fixing picks or holders · CPC title

• B28D1/188

  with exchangeable cutter bits or cutter segments · CPC title

• E21C35/18 Primary

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