Imperforate bowl: centrifugal separators – Rotatable bowl – Including driven material-moving means therein
Reexamination Certificate
1999-03-16
2001-03-27
Reifsnyder, David A. (Department: 1723)
Imperforate bowl: centrifugal separators
Rotatable bowl
Including driven material-moving means therein
C494S081000, C210S374000, C428S049000, C416S224000
Reexamination Certificate
active
06206818
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a tile, particularly a wear and/or abrasive resistant tile, to a tile carrier and to a tile and carrier combination.
DESCRIPTION OF PRIOR ART
It is known to employ ceramic, metallic, metallic alloys or the like tiles as at least part of a wear and/or abrasive resistant surface.
Thus, for example, it is known to mount such tile by means of a suitable bonding material on a carrier or the like which constitutes part of the blade or the like of apparatus intended to handle abrasive materials, such as, for example, classifiers; centrifuges etc. It is also known to employ a plurality of such tiles of wedge-like configuration in side-by-side abutting relationship to define the curved blade of such an apparatus.
The aforesaid carriers are usually of a suitable metal, and they are usually secured to the main body of the apparatus through welding or the like, the welding being carried out after the tiles have been bonded to the carriers by means of a suitable epoxy type adhesive, or the like.
The thermal shock involved in such welding operations can have a deleterious effect on the aforesaid bonding material which can result in the tiles becoming detached from their carriers during use.
OBJECT OF THE INVENTION
It is accordingly an object of this invention to provide an improved tile, tile carrier, and tile and carrier combination with which the aforesaid problems may be overcome or at least minimised.
SUMMARY OF THE VARIOUS ASPECTS OF THE INVENTION
According to a first aspect of the present invention, there is provided a tile, particularly a wear and/or abrasive resistant tile, having a front, working face, and a rear mounting face, a pair of spaced-apart, parallel slide surfaces associated with the rear mounting face, at least one of which slide surfaces is a lip formation, to provide, in use, for sliding, lateral insertion of the tile into a complementary receiving slot of a tile carrier, with the or each lip formation providing mechanical resistance to inadvertent detachment of the tile from its carrier, in a direction towards the front face.
The tile may be of alumina.
In a tile with one lip formation, the latter may be downwardly projecting, or upwardly projecting, and could be constituted by a web or flange. In a tile with two, opposed lip formations, one may be half dovetail.
At least one groove, typically of concave profile, may be provided in the rear face of the tile.
The tile may be of substantially wedge-like configuration having a pair of mutually inclined, radially extending end faces, a tangential innermost face, and an outermost face having a shallow, arcuate profile.
According to a second aspect of the present invention, of independent significance, there is provided a tile carrier to receive a tile, comprising a body memory having a laterally open slot defined at least in part by a pair of mutually facing, parallel mounting faces, between which faces spaced-apart, slide surfaces of a tile may be slid laterally, with a lip formation associated with at least one mounting face to provide mechanical resistance to inadvertent removal of a laterally inserted tile in a non-lateral, forward direction, and with an aperture communicating between a base of the slot and a rear opening of the tile, whereby an adhesive may be injected from outside the carrier through the aperture to enter the slot and make contact with a rear face of a laterally inserted tile.
Preferably, the carrier is of steel.
Preferably, the carrier is provided with two, mutually opposed lip formations, with at least one of the formations comprising a groove or half dovetail.
Bonding of a tile to its carrier may, for example, be effected through the employment of a suitable adhesive such as, for example, a suitable epoxy or the like.
Above the slot, the carrier may be provided with a transverse, planar support surface for a portion of the rear face of an inserted tile. To ensure contact of adhesive with such portion, the planar surface may be provided with a transverse groove, which stops short of the terminal ends of the support surface, the transverse groove being in communication with the slot, for fluid flow of adhesive, by means of an inter-connecting groove.
Preferably, the carrier is of such construction that, within limits, it may carry a range of tile sizes.
According to a third aspect of the present invention, of independent significance, there is provided a tile and carrier combination, with the carrier in accordance with the second aspect and with an adhesive accommodating space defined by a rear of a laterally inserted tile and the base of the slot, whereby injected adhesive fills this space to make contact with both the rear face or a substantial portion of the rear face, of a tile, and with the base of the slot, for bonded retention of the tile in the carrier, in addition to mechanical retention provided by the inter-engagement of the tile lip formations with the carrier slot.
It will be appreciated that with such an arrangement, the tile may be mounted on the carrier simply by bringing the said slide surfaces of the tile in the required inner-relationship with the slot of the carrier and then sliding the tile in a direction at right angles to the direction of the force that will be imposed on the tile in service; until the tile and carrier are in the required interlocking relationship. This third aspect thus provides both mechanical interlock, and chemical bond, between the tile and carrier.
Preferably, at what, in use, will be a radially outer end of the combination, the tile carrier protrudes beyond an outer edge of the tile so as to protect this edge during installation of the combined tile and carrier on a scroll etc.
According to a fourth aspect of the invention of independent significance, there is provided a scroll or other rotary member of apparatus such as a classifier or centrifuge provided with an array of tile and carrier combinations in accordance with the third aspect, such that the combinations describe a circle, with adjacent lateral edges of adjacent combinations in closely spaced, abutting relationship, whereby lateral displacement of a tile from its slot is precluded.
According to a fifth aspect of the insertion, there is provided a method of manufacturing a tile and carrier combination in accordance with the third aspect, comprising:
(i) inserting a tile laterally into a receiving groove of the carrier by inter-engagement of complementary slide surfaces;
(ii) welding the carrier to a scroll or similar component of a machine such as a classifier; and
(iii) injecting an adhesive through the aperture of the carrier into the slot to make contact between a rear face of a laterally inserted tile, whereby the latter is secured not only mechanically but also by chemically bonding.
REFERENCES:
patent: 4328925 (1982-05-01), Shapiro
patent: 5429581 (1995-07-01), Michaud et al.
patent: 1 592 810 (1981-07-01), None
patent: 7-171439 (1985-07-01), None
patent: 81/02853 (1981-10-01), None
Reifsnyder David A.
Tiletech Limited
Trexler Bushnell Giangiorgi & Blackstone Ltd.
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