Ejector for a mobile ground preparation machine

• US 9,353,491 B2
• Filed: 06/18/2013
• Issued: 05/31/2016
• Est. Priority Date: 06/19/2012
• Status: Active Grant

• Current Assignee: Bomag GmbH (FAYAT SAS)
• Original Assignee: Bomag GmbH (FAYAT SAS)
• Inventors: Wachsmann, Steffen
• Primary Examiner(s): Singh, Sunil
• Application Number:
  US13/920,399
• Publication Number:
  US 20130334865A1
• Time in Patent Office: 1,078 Days
• Field of Search: 404 90- 94, 299100-113, 299/36.1, 299 391- 398, 241/294, 372/67, 172/701.3, 172702-704
• US Class Current: 1/1
• CPC Class Codes: E01C 23/088 Rotary tools, e.g. milling drums for forming recesses to receive marking materials E01C23/0946

Abstract

Described is an ejector unit for a milling drum of a mobile ground preparation machine comprising a discharge side and a reverse side that is opposite to the discharge side. It comprises a basic unit on the drum and an ejector plate, which is held on the basic unit by means of screw-threaded bolts. There is a positive fit between the basic unit and the ejector plate, which positive fit involves at least one pin, on the one hand, and at least one complementary cylindrical counterbore on the other hand, whereby the at least one pin and the at least one ejector are oriented so as to be coaxial to the longitudinal axis of the screw-threaded bolts. Preferably, a shoulder is also provided along the base of the basic unit on its side facing the ejector plate, and the ejector plate has at least one complementary shoulder, whereby the shoulder on the basic unit and the at least one shoulder on the plate have meshing regions, which in the mounted state prevent transverse displacements in three directions.

Claims

1. An ejector unit for a milling drum of a mobile ground preparation machine, comprising:

a basic unit on the drum side; and

an ejector plate including a discharge side and a reverse side opposite to said discharge side, said ejector plate being removably attached to said basic unit by at least one screw-threaded bolt,

wherein a first positive fit is present between said basic unit and said ejector plate, which first positive fit is formed by at least one pin, on the one hand, and at least one complementary cylindrical counterbore, on the other hand, whereby the at least one complementary cylindrical counterbore is in the form of an enlargement of at least one bolt hole, and whereby said at least one pin and said at least one cylindrical counterbore are oriented so as to be coaxial to a longitudinal axis of said at least one screw-threaded bolt,

and further wherein said at least one pin is in the form of a first hollow cylinder segment on said basic unit, and further wherein a second hollow cylinder segment is present on said ejector plate and is angularly offset from said first hollow cylinder segment with regard to the longitudinal axes of the at least one bolt, such that said hollow cylinder segment on said basic unit and said hollow cylinder segment on said plate are complementary to each other to form a hollow body.

2. The ejector unit according to claim 1,

wherein said at least one pin is in the form of a sector of a hollow pin surrounding said at least one bolt hole.

3. The ejector unit according to claim 1,

wherein said at least one pin is in the form of a hollow cylinder and said at least one cylindrical counterbore is in the form of a hollow cylindrical recess.

4. The ejector unit according to claim 1,

wherein a second positive fit is provided between the basic unit and the reverse side of the ejector plate, the second positive fit comprising complementary parts shaped such that the basic unit and the ejector plate can be joined together only when a matched pair of shaped parts is provided on the basic unit and on the reverse side of the ejector plate in a complementary manner.

5. The ejector unit according to claim 1,

further comprising two spaced bolt holes, a pair of pins and a pair of cylindrical counterbores, said pair of pins and said pair of cylindrical counterbores being rotationally symmetrical with respect to a point of intersection of a longitudinal center axis (LM) and a width center axis (BM).

6. The ejector unit as defined in claim 1,

wherein a shoulder is present along a base of said basic unit on a side thereof that faces the ejector plate, and the ejector plate has at least one complementary shoulder, said shoulder on the basic unit and said at least one shoulder on the ejector plate exhibit meshing regions, which in a fitted state, prevent transverse displacements in three directions.

7. The ejector unit according to claim 6,

wherein said shoulder on said basic unit and said at least one shoulder on said ejector plate are configured complementary to one another such that said basic unit and said ejector plate can only be fitted together when said shoulder on said basic unit and said at least one shoulder on said ejector plate match in a complementary manner.

8. The ejector unit according to claim 6,

wherein said ejector plate comprises two shoulders which are mirror-reversed so as to be rotationally symmetrical with respect to a point of intersection of a longitudinal center axis (LM) and a longitudinal width axis (LB).

9. The ejector unit according to claim 1,

wherein a receded region is provided on the reverse side of the ejector plate facing the basic unit along a width center axis BM so that two lateral contact surfaces are formed which are located at a distance from the width center axis BM.

10. The ejector unit according to claim 1, further comprising:

an attrition indicator which is in the form of a groove provided at a discharge side of the ejector plate and spaced from a working edge of the ejector plate for indicating an attrition limit.

11. The ejector unit according to claim 1, wherein said hollow body comprises a hollow cylinder.

12. A milling drum comprising an ejector unit according to claim 1.