Chisel holder for a soil treatment machine

Patent metadata

Field	Value
Publication number	US-10208593-B2
Application number	US-201715664137-A
Country	US
Kind code	B2
Filing date	Jul 31, 2017
Priority date	Jul 4, 2011
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

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; 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 planar bearing surfaces, each of the bearing surfaces forming a part of a side of one and the same pyramid shape having at least three sides, each of the bearing surfaces intersecting at least one other of the bearing surfaces.

2. The tool apparatus of claim 1 , wherein:
the insertion projection extends from the insertion projection side in an insertion direction; and
the at least three non-parallel bearing surfaces are configured so as to support the support member against tension loading in the insertion projection parallel to the insertion direction, and to support the support member against forward and rearward forces and side to side forces orthogonal to the insertion direction.

3. The tool apparatus of claim 1 , wherein:
the insertion projection extends from the insertion projection side in an insertion direction; and
the at least three non-parallel bearing surfaces are configured such that a lateral force in any direction perpendicular to the insertion direction will have at least a component of the lateral force supported by at least one of the bearing surfaces.

4. The tool apparatus of claim 1 , wherein:
the at least three non-parallel bearing surfaces comprises four non-parallel bearing surfaces.

5. The tool apparatus of claim 1 , wherein the tool apparatus is a tool holder and the working side includes a bit receptacle.

6. A tool apparatus for an earth working machine, comprising:
an insertion projection having a longitudinal insertion 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 having defined on the insertion projection side a bearing surface system including four non-parallel planar bearing surfaces configured so as to support the support member against tension loading in the insertion projection parallel to the longitudinal insertion axis, and to support the support member against forward and rearward forces and side to side forces orthogonal to the longitudinal insertion axis, the forward and rearward forces being defined with reference to a tool advance direction, each of the four non-parallel planar bearing surfaces forming a part of a side of one and the same pyramid shape having four sides, each of the bearing surfaces intersecting at least one other of the bearing surfaces.

7. The tool apparatus of claim 6 , wherein:
a first pair of the four bearing surfaces are at a first angle to one another, the first pair of bearing surfaces diverging from the insertion projection side toward the working side; and
a second pair of the four bearing surfaces are at a second angle to one another, the second pair of bearing surfaces diverging from the insertion projection side toward the working side.

8. The tool apparatus of claim 6 , wherein:
the insertion projection extends in a first direction; and
the bearing surfaces all face in the first direction.

9. The tool apparatus of claim 6 , wherein the four non-parallel bearing surfaces include:
a left front bearing surface arranged to support the support member against forward forces and forces toward a left side from the longitudinal insertion axis;
a right front bearing surface arranged to support the support member against forward forces and forces toward a right side from the longitudinal insertion axis;
a left rear bearing surface arranged to support the support member against rearward forces and forces toward the left side from the longitudinal insertion axis; and
a right rear bearing surface arranged to support the support member against rearward forces and forces toward the right side from the longitudinal insertion axis.

10. The tool apparatus of claim 9 , wherein:
the front bearing surfaces are at an angle to each other in a range of from 100° to 120°; and
the rear bearing surfaces are at an angle to each other in a range of from 120° to 140°.

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

12. The tool apparatus of claim 9 , wherein:
the working side includes a bit receptacle;
the bit receptacle has a longitudinal center receptacle axis;
planes defined by the two front bearing surfaces intersect at a front longitudinal center bearing axis; and
the longitudinal center receptacle axis and the front longitudinal center bearing axis enclose an enclosed angle in a range of from 40° to 60°.

13. The tool apparatus of claim 9 , wherein:
the working side includes a bit receptacle;
the bit receptacle has a longitudinal center receptacle axis;
planes defined by the two rear bearing surfaces intersect at a rear longitudinal center bearing axis; and
the longitudinal center receptacle axis and the rear longitudinal center bearing axis enclose an enclosed angle in a range of from 70° to 90°.

14. The tool apparatus of claim 6 , wherein:
the insertion projection includes a pressure surface defined on the insertion projection and oriented such that a force normal to the pressure surface places a tension loading on the insertion projection.

15. The tool apparatus of claim 6 , wherein:
the working side includes a bit receptacle.

Assignees

• Wirtgen Gmbh

Inventors

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

Classifications

• E21C35/193 Primary

  using bolts as main fixing elements · CPC title

• E21C35/18

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

• B28D1/188

  with exchangeable cutter bits or cutter segments · CPC title

• E21C35/191

  for fixing holders · CPC title

• E21C35/1933

  the picks having a cylindrical shank · CPC title