Abrading – Abrading process – Glass or stone abrading
Reexamination Certificate
2000-06-16
2001-09-11
Banks, Derris H. (Department: 3723)
Abrading
Abrading process
Glass or stone abrading
C451S242000, C451S246000
Reexamination Certificate
active
06287176
ABSTRACT:
The invention relates to a grinding disk with a peripheral groove according to the preamble of Claim
1
.
Grinding disks of this type are known. They are used to grind the edges of glass panes while simultaneously applying a cooling liquid to the point of grinding. The peripheral groove, which has a set contour that is dictated by the manufacturing process, is subject to wear over time. The grinding disk must then be replaced. In order to minimize this wear, a cooling fluid, usually water, is poured onto the point of grinding. The stream of water must be directed as precisely as possible onto a predetermined point while taking into consideration the relevant influence factors.
It is therefore important to pinpoint the exact position between the peripheral groove of the grinding disk, the edge of the glass pane that is to be ground and the point of impact of the stream of cooling liquid upon the area that is to be ground.
Since the stream of cooling liquid is usually stationary with respect to the grinding spindle, i.e. it can only be aligned in conjunction with the grinding spindle, the measurements of the series of grinding disks to be used must agree to the extent that the point of impact of the stream of cooling liquid with regard to the point of grinding is exactly retained.
It is therefore not possible to use just any desired series of grinding disks one after the other.
When such grinding disks are reconditioned, it is moreover necessary to take care that all grinding disks that are part of one series remain together and are not intermingled with grinding disks of a different series.
If we take into account that the peripheral groove of a grinding disk has a finite useful life before it must be reworked, a specific relationship between serviceable life and set-up time results.
The present invention is intended to improve this relationship. It is therefore the object of this invention to improve the grinding disk which is to be used for the specific application of grinding the edges of glass panes in such a way that the serviceable life of the tool is extended, regardless of what the abrasive is composed of.
The invention offers the advantage that the number of positioning procedures needed to align the geometry between the grinding disk, the glass pane and the stream of cooling liquid during each serviceable life cycle is cut in half.
Basically, this invention produces a doubling of the serviceable life of the tool in conjunction with a shorter reset time to allow for turning over the grinding disk when a worn peripheral groove is exchanged for a new peripheral groove.
In this context, it is important for the grinding disk to have one stop surface each on two opposing flat sides. This stop surface serves as a reference surface for determining the distance to one of two peripheral grooves. The other stop surface then forms the reference surface for the other peripheral groove. This makes it possible to use both sides of the grinding disk. Each of the stop surfaces is assigned a single peripheral groove. The geometrical distance between the stop surface and the peripheral groove is the same for both possibilities offered by the grinding disk.
This ensures that the critical distance between the stop surface and the peripheral groove always remains the same, irrespective of the how the grinding disk is mounted onto the grinding spindle.
The invention involves two embodiments.
In the first embodiment, each peripheral groove is assigned to the stop surface of the flat side that is directly adjacent to it. In the other embodiment, each peripheral groove is assigned to a stop surface situated on the opposite flat side.
It is the first embodiment, however, that is the more significant of the two since it is expected to be less prone to vibration.
In the following, the invention will be explained in greater detail based on one of the embodiments.
REFERENCES:
patent: 5658189 (1997-08-01), Kagamida
patent: 5944584 (1999-08-01), Toyama
patent: 890401 (1996-04-01), None
patent: 11320364 (1999-11-01), None
Banks Derris H.
Pandiscio & Pandiscio
Wendt GmbH
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