DE20017014U1 - Milling ring and grinding segment for such a ring - Google Patents

Description

Patent attorneys:. ·..· .:.

Dipl.-Ing. A. Wasmeier

Dipl.-lng. H. Graf

Authorized before the European Patent Office + Trade Mark Office · Professional Representatives before the European Patent Office + Trade Mark Office

Patent Attorneys PO Box 10 08 26 93008 Regensburg

German Patent and Trademark Office Zweibrückenstr.

80297 Munich

D-93008 REGENSBURG P.O. BOX 10 08 26

D-93055 REGENSBURG GREFLINGERSTRASSE 7

phone (0941)79 20 85 September 2000 (0941)79 20 86 fax (0941)79 51 06 E-mail: wasmeier-graf@t-online.de Our sign Date Our Ref. Date M/g 19.824 . 28.

Your Ref.

Your Message Your Letter

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Applicant:

Manfred Mrosinsky
Gambachstrasse 20
93173 Wenzenbach

Title:

Milling ring and grinding segment for such a ring

Accounts: HypoVereinsbank (bank code 750 200 73) 5 839 300 Place of jurisdiction Regensburg

Munich Post Office (BLZ 700 100 80) 893 69-801 ai9824.doc

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Milling ring and grinding segment for such a ring

The innovation relates to a milling ring or grinding ring according to the generic term of claim 1 and to a grinding segment according to the generic term of claim 10.

Milling rings for grinding devices or grinding machines, especially for processing or strengthening concrete and natural stone, are known in a wide variety of designs. A milling ring (EP 0 614 726) is also known in which, in order to simplify the replacement of worn or defective grinding bodies, these are attached to the heads of screws that are screwed into axial holes in the milling ring.

One of the disadvantages of this known milling ring is that, in order to avoid undesired loosening of the screws supporting the grinding bodies, the threads must be designed in relation to the direction of rotation of the milling ring in the respective machine in such a way that the screws are subjected to a torque in the sense of additional tightening due to the different frictional forces on the axially inner and outer areas of each grinding body. This can lead to difficulties in loosening a segment or a screw, at least if grinding segments need to be replaced.

The aim of the innovation is to demonstrate an improved milling or grinding ring. To solve this problem, a milling ring is designed in accordance with claim 1 and a grinding segment is designed in accordance with claim 10.

The new milling or grinding ring is characterized by a particularly simple design with regard to the fastening and anchoring of the grinding segments. Only simple holes are required for the tenon sections of the support pieces, which can be produced very easily, especially without threads.

The innovative design also offers the advantage that the respective grinding segment or its grinding body can be adjusted or set around the axis of the pin section, which (axis) is preferably parallel to the axis of the grinding or milling ring, and can be secured or fixed in any position or setting by a locking element.

Further developments of the invention are the subject of the subclaims. The innovation is explained in more detail below using the figures of an embodiment. They show:

Fig. 1 shows a simplified section through the milling ring with a

this ring replaceably attached grinding segment; Fig. 2 and 3 the grinding segment of Figure 1 in individual representation and in side view

and in plan view;
Fig. 4 shows a plan view of another possible embodiment of the grinding segment.

The milling ring, generally designated 1 in the figures, which is fastened in a known manner to a motor flange of a grinding device (not shown), for example for strengthening or grinding concrete and natural stone, is provided on its outer circumference with a plurality of grinding segments 2, which are provided there at a uniform distance from one another and also at the same radial distance from the central axis of the milling ring 1. In the grinding device, the milling ring 1 is mounted, for example, in such a way that its axis is coaxial with a vertical axis and the grinding segments then protrude over the underside of the grinding ring 1 mounted in this way.

The grinding segments 2 each consist of a grinding body 3 and a support segment or support piece 4, to which the respective grinding body 3 is fastened and which in turn is replaceably anchored to the milling ring in the manner described in more detail below.

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As the figures show, each support piece 4 is essentially designed like a bolt or pin, with a pin section 5 having a circular cylindrical peripheral surface, which is tapered at one end and is made in one piece at the other end with a plate-shaped section 6 which has a circular cylindrical peripheral surface, but an enlarged diameter. The plate section 6 is provided on its end face facing away from the pin section 5, which lies perpendicular to the plane of the longitudinal extension of the pin section 5, with a recess 7 with a closed ring that is open towards this end face. In the embodiment shown, the recess 7 has a circular cylindrical cross-section with a flat bottom that is coaxial with the longitudinal axis of the pin section 5. The circular cylindrical grinding body 3 is anchored in the recess 7 at one end in a suitable manner, for example by gluing. Between its two ends, the pin section 5 is provided with a groove 8 which is open towards the circumference and encloses the longitudinal axis of the pin section.

For fastening the grinding segments 2 or their support pieces 4, the milling or grinding ring 1 is provided on its underside with a plurality of holes 9, into each of which a pin section 5 of a grinding segment 3 can be inserted. The groove 8, with its edge 8' remote from the plate section 6, forms a conical surface whose axis is coaxial with the longitudinal axis L and is designed such that the width of the groove 8 increases with increasing distance from the longitudinal axis L. The angle that this conical surface 8' encloses with an imaginary plane running perpendicular to the longitudinal axis L is, for example, 2°.

To fix the support pieces 4 of the respective bore 9, threaded holes 10 are provided on the outer circumference of the milling or grinding ring 1, which are oriented with their axis radially to the axis of the milling or grinding ring 1 and each of which opens into a bore 9. In each threaded hole 10, a screw 11 is provided, which is inserted into the groove 8 of the

support piece engages and presses the respective support piece with the surface of the plate section 6 facing in the tenon section 5 firmly against the underside of the milling ring 1 via the partial or truncated cone surface 8'.

Figure 4 shows a further possible embodiment of a support piece 4a, which differs from the support piece 4 only in that on the side of the plate section 6 facing away from the pin section 5, a groove-shaped recess 7a is provided instead of the circular recess 7, which then serves not for fastening the grinding body 3 designed as a round segment, but rather a grinding body designed as a block segment.

The described design has a number of advantages, including the advantage that the grinding segments 2 or their support pieces 4 and 4a can be manufactured particularly simply and efficiently, that the grinding or milling ring 1 can also be manufactured particularly simply and efficiently in the same way, in particular the receptacles for the grinding segments there can be designed as simple holes 9. Another significant advantage is that the grinding segments 2 can be replaced without dismantling the grinding or milling ring 1 from the machine, since the screws 11 used to fix the grinding segments 2, which can be operated with a conventional tool, namely with a simple wrench, are accessible on the circumference of the grinding or milling ring.

Furthermore, the design according to the invention also allows an adjustment of the orientation of grinding bodies which are densely designed as round segments by means of the pin sections.

The innovation has been described above using an exemplary embodiment. It is understood that numerous changes and modifications are possible without thereby departing from the inventive concept underlying the innovation.

Claims (18)

1. Milling or grinding ring for a grinding device, in particular for grinding and/or strengthening concrete and natural stone, with a plurality of grinding segments ( 2) provided on a milling ring (1 ) , each of which is received by a support piece or support pieces ( 4 ) in a receptacle ( 9 ) which is open on at least one side of the milling ring ( 1 ) and is secured there by at least one securing element ( 11 ), characterized in that the support pieces ( 4 ) are each provided with a pin section ( 5 ) for receiving and anchoring in a receptacle designed as a bore ( 9 ). 2. Milling ring according to claim 1, characterized in that the pin portion ( 5 ) is circular-cylindrical on its outer circumference. 3. Milling ring according to claim 1 or 2, characterized in that the pin portion ( 5 ) has on its circumference at least one recess ( 8 ) for a bolt- or screw-shaped securing element ( 11 ). 4. Milling ring according to claim 3, characterized in that the recess is formed by a circumferential groove ( 8 ). 5. Milling ring according to claim 3 or 4, characterized in that the support piece ( 4 ) forms at least one contact surface for axial support against a counter surface of the milling ring ( 1 ) and that a partial surface ( 8 ') is formed in the recess ( 8 ) and/or on the securing element ( 11 ), which presses the contact surface of the support piece ( 4 ) against the counter surface on the milling ring ( 1 ) when securing the support piece ( 4 ) or the pin section ( 5 ) in the receptacle ( 9 ). 6. Milling ring according to one of the preceding claims, characterized in that the respective support piece ( 4 ) has a plate section ( 6 ) which projects beyond the circumference of the pin section ( 5 ) and to which at least one grinding body ( 3 ) is fastened. 7. Milling ring according to one of the preceding claims, characterized in that the grinding body ( 3 , 3a ) is designed symmetrically to a central axis, and that the central axis is arranged coaxially with the longitudinal axis (L) of the pin section ( 5 ). 8. Milling ring according to one of the preceding claims, characterized in that the grinding body ( 3 ) is circular-cylindrical in shape. 9. Milling ring according to one of the preceding claims, characterized in that the grinding body ( 3 a) is cuboid- or block-shaped. 10. Grinding segment for a milling or grinding ring of a grinding device, in particular for grinding and/or strengthening concrete and natural stone, with a support piece ( 4 ) for fastening in a receptacle ( 9 ) of the milling or grinding ring and with a grinding body provided on the support piece, characterized in that the support piece ( 4 ) is provided with a pin section ( 5 ) for receiving and anchoring in a receptacle designed as a bore ( 9 ). 11. Grinding segment according to claim 10, characterized in that the pin portion ( 5 ) is circular-cylindrical on its outer circumference. 12. Grinding segment according to claim 10 or 11, characterized in that the pin portion ( 5 ) has at least one recess ( 8 ) for a bolt- or screw-shaped securing element ( 11 ) on its circumference. 13. Grinding segment according to claim 12, characterized in that the recess is formed by a circumferential groove ( 8 ). 14. Grinding segment according to claim 12 or 13, characterized in that the support piece ( 4 ) forms at least one contact surface for axial support against a counter surface of the milling ring ( 1 ) and that a partial surface ( 8 ') is formed in the recess ( 8 ) and/or on the securing element ( 11 ), which presses the contact surface of the support piece ( 4 ) against the counter surface on the milling ring ( 1 ) when securing the support piece ( 4 ) or the pin section ( 5 ) in the receptacle ( 9 ). 15. Grinding segment according to one of the preceding claims, characterized in that the respective support piece ( 4 ) has a plate section ( 6 ) which projects beyond the circumference of the pin section ( 5 ) and to which at least one grinding body ( 3 ) is fastened. 16. Grinding segment according to one of the preceding claims, characterized in that the grinding body ( 3 , 3a ) is designed symmetrically to a central axis, and that the central axis is arranged coaxially with the longitudinal axis (L) of the pin section ( 5 ). 17. Grinding segment according to one of the preceding claims, characterized in that the grinding body ( 3 ) is circular-cylindrical in shape. 18. Grinding segment according to one of the preceding claims, characterized in that the grinding body ( 3 a) is cuboid- or block-shaped.