1. A screen basket for screening suspensions, containing wearing particles, comprising a circumferential wall of a base material provided with screen passages, and a wear resistant outer layer of a material which is harder than the base material and covers the circumferential wall, characterized in that at least one wear-indicating layer is applied on the circumferential wall between the latter and the outer layer and adapted to indicate when at least a portion of the outer layer has been worn down to the wear-indicating layer.
2. A screen basket according to claim 1, wherein the wear-indicating layer is adapted to optically indicate where at least a portion of the outer layer has been worn down to the wear-indicating layer.
3. A screen basket according to claim 2, wherein the wear-indicating layer has a colour that is different than that of the outer layer.
4. A screen basket according to claim 3, wherein the wear-indicating layer and the outer layer consist of chromium, wherein the wear-indicating layer is thinner than the outer layer.
5. A screen basket according to claim 4, wherein the wear-indicating chromium layer is at most 50 m in thickness, whereas the outer chromium layer is at least 100 m in thickness.
6. A screen basket according to any one of claims 3-5, wherein the wear-indicating layer is black whereas the outer layer is bright, or vice versa.
7. A screen basket according to claim 1, wherein the wear-indicating layer is adapted to secrete a signal substance where at least a portion of the outer layer has been worn down to the wear-indicating layer.
8. A screen basket according to claim 7, wherein the signal substance is chemical or radioactive.
9. A screen basket according to claim 7 or 8, wherein the wear-indicating layer comprises a relatively thin chromium layer, wherein a signal substance is supplied on the thin chromium layer between the latter and the outer layer, which preferably comprises a relatively thick chromium layer.
10. A screen basket according to claim 9, wherein the wear-indicating chromium layer is at most 50 m in thickness whereas the outer chromium layer is at least 100 m in thickness.
11. A screen basket according to any of one of claims 7-10, characterized by a sensor for sensing the signal substance when the latter follows the accept flow from the screen basket.
12. A screen basket according to claim 1, wherein the wear-indicating layer comprises a material with an electric resistance differing from the electric resistance of the outer layer.
13. A screen basket according to claim 12, wherein the wear-indicating layer comprises a material with an electric resistance, which is lower than the resistance of the outer layer.
14. A screen basket according to claim 13, wherein the wear-indicating layer comprises a copper or silver material.
15. A screen basket according to any of claims 12-14, characterized by relatively thin chromium layer which is supplied on the circumferential wall between the latter and the wear-indicating layer.
16. A screen basket according to any of claims 12-15, wherein the outer layer comprises a relatively thick chromium layer.
17. A screen basket according to claim 15 and 16, wherein the wear-indicating chromium layer is at most 50 m in thickness whereas the outer chromium layer is at least 100 m in thickness.
18. A screen basket according to any of claims 12-17, characterized by a resistance meter adapted to measure the electric resistance between the ends of the screen basket.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An apparatus for use in supporting a substrate carrier comprising:
an overhead transfer flange adapted to couple to a substrate carrier body and an overhead carrier support of an overhead transfer conveyor, the overhead transfer flange having:
a flange plate adapted to couple to the substrate carrier;
a first side;
a second side opposite the first side that is wider than the first side;
a third side extending from the first side to the second side and including a blade adapted to engage supporting features of the overhead carrier support; and
a fourth side opposite the third side extending from the first side to the second side and including a blade adapted to engage supporting features of the overhead carrier support;
wherein the blades of the third side and the fourth side of the overhead transfer flange extend from the first side to the second side along non-parallel paths and wherein a medial surface of each blade forms an oblique angle with a plane defined by the first, second, third and fourth sides of the transfer flange and wherein the blades of the third side and the fourth side extend down from lower surfaces of the flange plate located adjacent to, and between the blades, and the blades include a blade edge terminating below the lower surfaces.
2. The apparatus of claim 1 wherein the third side and the fourth side are separated by an angle of about 60 degrees.
3. The apparatus of claim 1 wherein each blade has a blunted blade edge.
4. The apparatus of claim 3 wherein each blade has a radiused blade edge.
5. The apparatus of claim 1 wherein:
the blade of the third side of the overhead transfer flange has a surface that is angled so as to mate with an angled surface of a first supporting feature of the overhead carrier support; and
the blade of the fourth side of the overhead transfer flange has a surface that is angled so as to mate with an angled surface of a second supporting feature of the overhead carrier support.
6. The apparatus of claim 1 wherein surfaces forming each respective blade are non-parallel to each other.