1. An apparatus for providing a substrate to which a magnet can be attached, the apparatus comprising:
(a) a cylindrical rod having an axle about which said rod is rotatably mounted; and
(b) a sheet having a magnetically receptive region, the sheet having a first edge mounted to the cylindrical rod, a central region of the sheet winding circumferentially around the cylindrical rod and terminating in a second edge opposite the first edge, wherein the second edge is displaceable relative to the cylindrical rod’s axle.
2. The apparatus in accordance with claim 1, further comprising means for rotating the cylindrical rod in at least one direction.
3. The apparatus in accordance with claim 1, further comprising a prime mover drivingly linked to the cylindrical rod for rotating the cylindrical rod in at least one direction.
4. The apparatus in accordance with claim 1, further comprising a bias drivingly linked to the cylindrical rod for rotatably biasing the cylindrical rod in one direction.
5. The apparatus in accordance with claim 4, wherein the bias biases the cylindrical rod in a sheet-retracting direction.
6. The apparatus in accordance with claim 5, wherein the magnetically receptive region of the sheet includes substantially the entire sheet.
7. The apparatus in accordance with claim 6, further comprising a ratchet mounted to the cylindrical rod near the axle, wherein the ratchet selectively stops rotation of the cylindrical rod in the retracting direction.
8. The apparatus in accordance with claim 7, wherein the cylindrical rod is a circular cylinder.
9. The apparatus in accordance with claim 7, wherein the cylindrical rod is an octagonal cylinder.
10. An apparatus for providing a substrate to which a magnet can be attached, the apparatus comprising:
(a) a cylindrical rod having an axle about which the rod is rotatably mounted;
(b) a magnetically receptive sheet having a first edge mounted to the cylindrical rod, a central region of the sheet winding circumferentially around the cylindrical rod and terminating in a second edge opposite the first edge, wherein the second edge is displaceable relative to the cylindrical rod’s axle; and
(c) means for rotating the cylindrical rod to retract the sheet from an extended position.
11. An apparatus for providing a substrate to which a magnet can be attached, the apparatus comprising:
(a) a cylindrical rod having an axle about which the rod is rotatably mounted;
(b) a magnetically receptive sheet having a first edge mounted to the cylindrical rod, a central region of the sheet winding circumferentially around the cylindrical rod and terminating in a second edge opposite the first edge, wherein the second edge is displaceable relative to the cylindrical rod’s axle; and
(c) a bias drivingly linked to the cylindrical rod for rotatably biasing the cylindrical rod in a sheet-retracting direction.
12. An apparatus for providing a substrate to which a magnet can be attached, the apparatus comprising:
(a) a cylindrical rod having an axle about which the rod is rotatably mounted;
(b) a magnetically receptive sheet having a first edge mounted to the cylindrical rod, a central region of the sheet winding circumferentially around the cylindrical rod and terminating in a second edge opposite the first edge, wherein the second edge is displaceable relative to the cylindrical rod’s axle;
(c) a bias drivingly linked to the cylindrical rod for rotatably biasing the cylindrical rod in a sheet-retracting direction; and
(d) a ratchet mounted to the cylindrical rod near the axle, wherein the ratchet selectively stops rotation of the cylindrical rod in the sheet-retracting direction.
13. The apparatus in accordance with claim 12, wherein the cylindrical rod is a circular cylinder.
14. An apparatus for providing a substrate to which a magnet can be attached, the apparatus comprising:
(a) a rotatable cylindrical rod having an axis of rotation;
(b) a sheet having a magnetically receptive region, the sheet having a first edge mounted to the cylindrical rod, a central region of the sheet winding circumferentially around the cylindrical rod and terminating in a second edge opposite the first edge, wherein the second edge and the cylindrical rod’s axis of rotation relatively are displaceable.
15. An apparatus for providing a substrate to which a magnet can be attached, the apparatus comprising:
(a) a cylindrical rod having an axle about which the rod is rotatably mounted;
(b) a magnetically receptive sheet having a first edge mounted to the cylindrical rod, a central region of the sheet winding circumferentially around the cylindrical rod and terminating in a second edge opposite the first edge, wherein the second edge is displaceable relative to the cylindrical rod’s axle;
(c) a bias drivingly linked to the cylindrical rod for rotatably biasing the cylindrical rod in a sheet-retracting direction; and
(d) a magnet removably mounted to a major surface of the sheet.
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 agent for mixing in with a service fluid for a technical layout, containing:
at least one ingredient A chosen from the group of the three-layer silicates,
at least one ingredient B chosen from the group consisting of bentonites, pyrogenic silicic acids, and talc, and
graphite.
2. The agent according to claim 1, characterized in that ingredient A is a natural or chemically modified muscovite andor a natural or chemically modified phlogopite.
3. The agent according to claim 2, characterized in that the chemically modified phlogopite is a phlogopite modified with aminosilane.
4. The agent according to claim 1, characterized in that the bentonite is chemically modified.
5. The agent according to claim 1, characterized in that the pyrogenic silicic acid is chemically aftertreated.
6. The agent according to claim 1, characterized by at least one additional ingredient C, chosen from the group consisting of industrial carbon black, organic carbonates, water and dispersant.
7. The agent according to claim 6, characterized in that the organic carbonate is propylene carbonate.
8. The agent according to claim 1, characterized in that ingredients A, B and C have particle sizes less than 25 \u03bcm, preferably less than 8 \u03bcm, especially preferably less than 2 \u03bcm.
9. A concentrate for mixing in with a service fluid for a technical layout, containing a carrier and an agent according to one claim 1.
10. The concentrate according to claim 9, characterized in that the agent is dispersed in the carrier.
11. The concentrate according to claim 9, characterized in that the carrier is an oil.
12. The concentrate according to claim 9, characterized in that the carrier is the service fluid.
13. A service fluid comprising an agent according to claim 1.