1. A shredder comprising:
a housing;
a shredder mechanism received in the housing and including an electrically powered motor and cutter elements, the shredder mechanism enabling articles to be shredded to be fed into the cutter elements and the motor being operable to drive the cutter elements so that the cutter elements shred the articles fed therein;
the housing having a movable part providing at least part of an opening enabling articles to be fed therethrough into the cutter elements of the shredder mechanism for shredding, the movable part being movable from a first position to a second position and being biased to the first position;
a detector configured to detect movement of the movable part to the second position;
the movable part being constructed to move from the first position to the second position upon a user attempting to force an article having a thickness greater than a predetermined thickness through the opening; and
a controller operable to perform a predetermined operation responsive to the detector detecting that the movable part has moved to the second position.
2. A shredder according to claim 1, wherein the detector comprises a switch that is actuated in response to the movable part moving to the second position.
3. A shredder according to claim 1, wherein the predetermined operation is illuminating an indicator.
4. A shredder according to claim 1, wherein the predetermined operation is sounding an alarm indicator.
5. A shredder according to claim 1, wherein the predetermined operation is stopping the cutter elements.
6. A shredder according to claim 1, wherein the controller comprises a microcontroller.
7. A shredder according to claim 1, wherein at least a portion of a wall of the opening is moveable in response to pressure of an inserted article having a thickness greater than the predetermined thickness, thereby triggering the detector.
8. A shredder according to claim 7, wherein the portion moves outwardly in response to the pressure.
9. A shredder according to claim 7, wherein the portion moves downwardly in response to the pressure.
10. A shredder according to claim 7, wherein the portion is spring biased towards an upward position and in response to the insertion of the article having a thickness greater than the predetermined thickness, the portion is pushed downward to actuate the switch.
11. A shredder according to claim 10, wherein the portion includes a plunger.
12. A shredder according to claim 10, wherein the shredder comprises a switch that is actuated by the plunger as the movable part moves to the second position.
13. A shredder according to claim 2, wherein the switch is a foil switch.
14. A shredder according to claim 2, wherein the switch is a lever switch.
15. A shredder according to claim 1, wherein the detector comprises a mechanical switch.
16. A shredder according to claim 1, wherein the detector comprises an optical detector.
17. A shredder according to claim 1, wherein the detector comprises a strain gauge configured and arranged to measure a movement of the movable part.
18. A shredder comprising:
a housing;
a shredder mechanism received in the housing and including an electrically powered motor and cutter elements, the shredder mechanism enabling articles to be shredded to be fed into the cutter elements and the motor being operable to drive the cutter elements so that the cutter elements shred the articles fed therein;
the housing having an opening enabling articles to be fed therethrough into the cutter elements of the shredder mechanism for shredding;
a resistive switch, at least in part located adjacent the opening and configured to indicate the presence of a person or animal in contact with the switch; and
a controller operable to perform a predetermined operation responsive to the indicated presence of the person or animal.
19. A shredder according to claim 18, wherein the predetermined operation is illuminating an indicator.
20. A shredder according to claim 18, wherein the predetermined operation is sounding an alarm indicator.
21. A shredder according to claim 18, wherein the predetermined operation is stopping the cutter elements.
22. A shredder according to claim 18, wherein the resistive switch further comprises a pair of electrically isolated conductive elements that, when simultaneously contacted by a part of the person or animal, are in electrical communication.
23. A shredder according to claim 18, wherein the controller is configured to monitor changes in signal strength from the switch over time, and to adjust a threshold value for performing the predetermined operation.
24. A shredder according to claim 18, wherein the controller is configured to perform the predetermined operation based at least in part on a rate of change of a monitored resistance of the resistive switch.
25. A shredder according to claim 18, wherein the controller is configured to perform the predetermined operation based at least in part on a monitored resistance of the resistive switch.
26. A device for use with a shredder, the shredder including a housing having an opening enabling articles to be fed therethrough into cutter elements of a shredder mechanism for shredding, the device comprising:
a switch, affixable to a portion of a shredder proximate the opening and configured to indicate the presence of a person or animal in contact with the switch;
a controller, in electrical communication with the switch, the controller having a connector constructed and arranged to engage a power supply and a receptacle constructed and arranged to accept a power cord of the shredder, the controller further being configured to provide power from the power supply to the shredder and to stop providing power to the shredder responsive to the indicated presence of the person or animal.
27. A device as in claim 26, wherein the switch is removably affixable to the shredder.
28. A device as in claim 26, wherein the switch is a capacitive switch.
29. A device as in claim 26, wherein the switch is a resistive switch.
30. A device as in claim 26, wherein the switch is a mechanical switch.
31. A device as in claim 30, wherein the mechanical switch is a pressure switch.
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. A method for controlling roaming restrictions for dispatch calling of a mobile station in a network, comprising the acts of:
receiving at a home location register of the mobile station a dispatch processor identifier identifying a dispatch application processor that supports a plurality of mobile stations for dispatch calling, and a mobile station identifier that identifies the mobile station;
determining at the home location register a domain of the dispatch application processor based upon the dispatch processor identifier by accessing data stored in the home location register which is sent to the home location register during an enhanced global title translation table tool (EGT4) distribution process;
determining at the home location register whether the mobile station is authorized to operate in the domain, based upon the mobile station identifier;
sending from the home location register to the dispatch application processor subscriber data including calling features of the mobile station which are restricted in the domain;
preventing at the dispatch application processor the mobile station from operating in the domain, if the mobile station is not authorized to operate in the domain; and
restricting at the dispatch application processor calling features available to the mobile station based on the subscriber data and the mobile station identifier, if the mobile station is authorized to operate in the domain.
2. The method of claim 1, wherein the calling features comprise at least one of encrypted private calling, private call service, cross fleet service, call alert service, group call service, emergency service, packet data service, and individual dispatch long distance calling.
3. The method of claim 1, wherein the domain comprises one of a foreign network as a whole, a specific geographical area of the foreign network, and a specific geographical area of a home network.
4. The method of claim 3, wherein the foreign network comprises a wireless network disposed in a country other than a home country of the mobile station.
5. The method of claim 3, wherein the home network comprises a wireless network in a home country of the mobile station.
6. The method of claim 1, wherein the home location register is disposed in a foreign network.
7. The method of claim 6, wherein the foreign network comprises a wireless network disposed in a country other than a home country of the mobile station.
8. The method of claim 1, wherein the dispatch processor identifier is an ISDN address.
9. The method of claim 8, wherein the mobile station identifier is an international mobile subscriber identifier address.
10. A method for controlling roaming restrictions for dispatch calling of a mobile station in a network, comprising the acts of:
receiving at a home location register of the mobile station a dispatch processor identifier identifying a dispatch application processor that supports a plurality of mobile stations for dispatch calling, and a mobile station identifier that identifies the mobile station;
determining at the home location register a domain of the dispatch application processor based upon the dispatch application processor identifier;
determining at the home location register whether the mobile station is authorized to operate in the domain, based upon the mobile station identifier by accessing data stored in the home location register which is sent to the home location register during an enhanced global title translation table tool (EGT4) distribution process; and
restricting at the dispatch application processor calling features available to the mobile station, based upon the mobile station identifier, if the mobile station is authorized to operate in the domain.
11. The method of claim 10, wherein the calling features comprise at least one of encrypted private calling, private call service, cross fleet service, call alert service, group call service, emergency service, packet data service, and individual dispatch long distance calling.
12. The method of claim 10, wherein the domain comprises one of a foreign network as a whole, a specific geographical area of the foreign network, and a specific geographical area of a home network.
13. The method of claim 12, wherein the foreign network comprises a wireless network disposed in a country other than a home country of the mobile station.
14. The method of claim 12, wherein the home network comprises a wireless network in a home country of the mobile station.
15. The method of claim 10, wherein the home location register is disposed in a foreign network.
16. The method of claim 15, wherein the foreign network comprises a wireless network disposed in a country other than a home country of the mobile station.
17. The method of claim 15, wherein the foreign network comprises a wireless network disposed in a geographic area other than a home area of the mobile station.
18. The method of claim 10, wherein the dispatch processor identifier is an ISDN address.
19. The method of claim 18, wherein the mobile station identifier is an international mobile subscriber identifier address.
20. A non-transitory computer-readable medium encoded with a computer program for controlling roaming restrictions for dispatch calling of a mobile station in a network, the computer program comprising instructions for:
receiving at a home location register of the mobile station a dispatch processor identifier identifying a dispatch application processor that supports a plurality of mobile stations for dispatch calling, and a mobile station identifier that identifies the mobile station;
determining at the home location register a domain of the dispatch application processor based upon the dispatch processor identifier by accessing data stored in the home location register which is sent to the home location register during an enhanced global title translation table tool (EGT4) distribution process;
determining at the home location register whether the mobile station is authorized to operate in the domain, based upon the mobile station identifier;
sending from the home location register to the dispatch application processor subscriber data including calling features of the mobile station which are restricted in the domain;
preventing at the dispatch application processor the mobile station from operating in the domain, if the mobile station is not authorized to operate in the domain; and
restricting at the dispatch application processor calling features available to the mobile station based on the subscriber data and the mobile station identifier, if the mobile station is authorized to operate in the domain.
21. The computer-readable medium of claim 20, wherein the dispatch processor identifier is an ISDN address.
22. The computer-readable medium of claim 21, wherein the mobile station identifier is an international mobile subscriber identifier address.