1. A magnetic actuator unit for a circuit breaker, comprising:
a core;
a coil;
an actuating shaft;
a first movable plate;
a second movable plate;
two permanent magnets; and
a non-magnetic flat insert arranged between the core and the second movable plate,
wherein the first movable plate is configured to be attracted by the core to a first position at a first side of the core when a magnetic field is generated by the coil, and to switch the circuit breaker to an ON position when being attracted by the core,
wherein the first movable plate and the second movable plate are spaced apart from one another in a fixed position at a distance, such that when the first movable plate lifts off from the core with a stroke of the magnetic actuator unit to an OFF position, the second movable plate is configured to bear against the non-magnetic flat insert at a second position at a second side of the core opposite of the first position to generate a holding force of the magnetic actuator unit at the OFF position, and
wherein the non-magnetic flat insert and the second movable plate are configured to adjust a holding force of the magnetic actuator unit provided by the second movable plate and sufficient for holding the second movable plate at the OFF position against forces that are acting from outside the magnetic actuator unit to the magnetic actuator unit,
wherein the magnetic actuator unit comprises a fixing device configured to fix the non-magnetic flat insert to the core, and
wherein the non-magnetic flat insert is bended at opposite ends and fixed to the core by at least one screw comprised in the fixing device.
2. The magnetic actuator unit according to claim 1, wherein the non-magnetic flat insert comprises stainless steel.
3. The magnetic actuator unit according to claim 1,
wherein the second movable plate is configured to adjust a holding force of the magnetic actuator unit provided by the second movable plate at the OFF position based on a thickness of the second movable plate.
4. A circuit breaker in combination with a magnetic actuator unit according to claim 1, wherein the magnetic actuator unit is configured to switch the circuit breaker.
5. The magnetic actuator unit according to claim 1,
wherein the non-magnetic flat insert is configured to adjust a holding force of the magnetic actuator unit provided by the second movable plate at the OFF position based on a thickness of the non-magnetic flat insert.
6. A circuit breaker in combination with a magnetic actuator unit according to claim 5, wherein the magnetic actuator unit is configured to switch the circuit breaker.
7. The magnetic actuator unit according to claim 1, wherein the core comprises:
a core element;
at least two flanks surrounding the core element; and
at least two permanent magnets arranged between the core element and the flanks;
wherein the second movable plate is configured to adjust a holding force of the magnetic actuator unit provided by the second movable plate at the OFF position based on a relation of a width of the second movable plate to a distance between outer ends of the permanent magnets.
8. The magnetic actuator unit according to claim 7,
wherein the second movable plate is of a round shape and is configured to adjust a holding force of the magnetic actuator unit provided by the second movable plate at the OFF position based on a variation of a diameter of the second movable plate.
9. The magnetic actuator unit according to claim 8,
wherein the second movable plate is configured to adjust a holding force of the magnetic actuator unit provided by the second movable plate at the OFF position based on a thickness of the second movable plate.
10. A circuit breaker in combination with a magnetic actuator unit according to claim 9, wherein the magnetic actuator unit is configured to switch the circuit breaker.
11. A method of assembling a magnetic actuator unit for a circuit breaker, the method comprising:
arranging a coil at a core of the magnetic actuator unit such that the coil is configured to generate a magnetic flux in the core;
movably arranging a first movable plate such that the first movable plate is movable on an actuating shaft between an ON position and an OFF position;
arranging a non-magnetic flat insert at another side of the core, opposite to the first moving plate; and
arranging a second movable plate below the non-magnetic flat insert and on the same actuating shaft where the first movable plate is arranged so that the non-magnetic flat insert lies between the core and the second movable plate,
wherein the non-magnetic flat insert and the second movable plate are configured to adjust a holding force of the magnetic actuator unit provided by the second movable plate and sufficient for holding the second movable plate at the OFF position against outer forces that are acting on the magnetic actuator unit,
wherein the magnetic actuator unit comprises a fixing device configured to fix the non-magnetic flat insert to the core, and
wherein the non-magnetic flat insert is bended at opposite ends and fixed to the core by at least one screw comprised in the fixing device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A method of caching web resources, comprising the steps of:
accessing a first web resource; and
caching the first web resource, if no other web resource is accessed after a pre-determined period of time.
2. The method of claim 1 wherein the first web resource is cached in a random access memory.
3. The method of claim 1 wherein the first web resource is cached in a nonvolatile memory.
4. The method of claim 3 wherein the nonvolatile memory is one of a magnetic disk and a flash electrically erasable programmable read only memory (flash EEPROM).
5. The method of claim 1 further comprising the step of:
accessing a web resource other than the first web resource; and
retrieving the cached first web resource in response to a subsequent request to access the first web resource.
6. The method of claim 1 wherein the first web resource is a web page.
7. The method of claim 1 wherein the first web resource is a file for producing at least one of a sound and a movie.
8. A method of caching web resources, comprising the steps of:
accessing a first web resource; and
caching the first web resource, if the first web resource is subsequently accessed more than a pre-determined number of times.
9. The method of claim 8 wherein the first web resource is cached in a random access memory.
10. The method of claim 8 wherein the first web resource is cached in nonvolatile memory.
11. The method of claim 10 wherein the nonvolatile memory is one of a magnetic disk and a flash electrically erasable programmable read only memory (flash EEPROM).
12. The method of claim 8 further comprising the steps of:
accessing a web resource other than the first web resource; and
retrieving the cached first web resource in response to a subsequent request to access the first web resource.
13. The method of claim 8 wherein the first web resource is a web page.
14. The method of claim 8 wherein the first web resource is a file for producing at least one of a sound and a movie.
15. A method of caching web resources, comprising the steps of:
accessing a plurality of web resources; and
caching accessed web resources as cached web resources in accordance with one of a number of times accessed, a frequency of access, or a duration of access.
16. The method of claim 15 wherein web resources are cached in random access memory.
17. The method of claim 15 wherein web resources are cached in nonvolatile memory.
18. The method of claim 15 wherein the nonvolatile memory is at least one of a magnetic disk and a flash electrically erasable programmable read only memory (flash EEPROM).
19. The method of claim 15 further comprising the step of:
retrieving a cached web resource from a cache in response to an access request for a previously accessed web resource, if the cached web resource corresponds to the previously accessed web resource.
20. The method of claim 15 wherein an accessed web resource is selected for caching if the accessed web resource is accessed a pre-determined number of times within a pre-determined time period.
21. The method of claim 15 wherein an accessed web resource is selected for caching if the accessed web resource is accessed a pre-determined number of times.
22. The method of claim 15 wherein an accessed web resource is selected for caching if no other web resource is accessed after a pre-determined period of time.
23. The method of claim 15 wherein the first web resource is a web page.
24. The method of claim 15 wherein the first web resource is a file for producing at least one of a sound, an image, and a movie.
25. An apparatus comprising:
storage media containing caching logic for caching web resources, wherein the caching logic includes instructions to cache selected web resources as cached web resources in accordance with at least one of a number of times accessed, a frequency of access, or a duration of access, wherein the selected web resources correspond to a subset of a plurality of accessed web resources.
26. The apparatus of claim 25 further comprising:
a cache, wherein the caching logic includes instructions to retrieve a cached web resource from the cache in response to an access request for a previously accessed web resource, if the cached web resource corresponds to the previously accessed web resource.
27. The apparatus of claim 25 wherein an accessed web resource is selected for caching if the accessed web resource is accessed a pre-determined number of times within a pre-determined time period.
28. The method of claim 25 wherein an accessed web resource is selected for caching if the accessed web resource is accessed a pre-determined number of times.
29. The method of claim 25 wherein an accessed web resource is selected for caching if no other web resource is accessed after a pre-determined period of time.
30. The apparatus of claim 25 wherein the instructions form a portion of at least one of an operating system and a browser.