Author: claimsbot

1. An electronic device comprising:
a display;
a communication component;
a memory storing data in a first sandbox and data in a second sandbox, the first sandbox being a secure sandbox and having a shadow data component, the shadow data component storing a subset of the data stored in the first sandbox; and
a processor coupled to the display, the communication component, and the memory, the processor being configured to:
in response to a request:
provide the data stored in the first sandbox when the first sandbox is in an unlocked mode; and
provide the data stored in the shadow data component when the first sandbox is in a locked mode.
2. The electronic device according to claim 1, wherein the processor is further configured to:
receive from a server via the communication component information for updating the data stored in the first sandbox;
update the data stored in the first sandbox when the first sandbox is in the unlocked mode; and
update the data stored in the shadow component.
3. The electronic device according to claim 1, wherein the first sandbox further has an associated queue and the processor is further configured to:
receive from a server via the communication component information for updating the data stored in the first sandbox;
store the information for updating the data stored in the first sandbox in the queue when the first sandbox is in the locked mode; and
update the data stored in the shadow data component.
4. The electronic device according to claim 3, wherein the processor is further configured to:
update the data stored in the first sandbox based on the information for updating the data stored in the first sandbox stored in the queue when the first sandbox enters the unlocked mode.
5. The electronic device according to claim 1, wherein both the first sandbox and the second sandbox are controlled exclusively by a single operating system, the data stored in the first sandbox is encrypted, and the data stored in the shadow data component is a redundant subset of the data stored in the first sandbox.
6. The electronic device according to claim 1, wherein the electronic device displays an update on the display using the data stored in the shadow data component when the first sandbox is in the locked mode.
7. The electronic device according to claim 6, wherein the update is selected from the group consisting of a calendar reminder, an email notification, and a contact list entry.
8. The electronic device according to claim 3, wherein an element of data that is stored in both the first sandbox and the shadow data component is associated by a first identifier and an element of data that is stored in both the queue and the shadow data component is associated by a second identifier.
9. The electronic device according to claim 1, wherein when the first sandbox is in the locked mode, all data stored in the first sandbox is inaccessible except for data stored in a start-up area of the first sandbox until access to the first sandbox is authenticated and wherein the shadow data component is stored in the start-up area.
10. A method for use on an electronic device having a display, a communication component, a memory storing data in a first sandbox and data in a second sandbox, the first sandbox being a secure sandbox and having a shadow data component, the shadow data component storing a subset of the data stored in the first sandbox, and a processor coupled to the display, the communication component, and the memory, the method comprising:
in response to a request:
providing the data stored in the first sandbox when the first sandbox is in an unlocked mode; and
providing the data stored in the shadow data component when the first sandbox is in a locked mode.
11. The method according to claim 10, further comprising:
receiving from a server via the communication component information for updating the data stored in the first sandbox;
updating the data stored in the first sandbox when the first sandbox is in the unlocked mode; and
updating the data stored in the shadow component.
12. The method according to claim 10, wherein the first sandbox further has an associated queue, the method further comprising:
receiving from a server via the communication component information for updating the data stored in the first sandbox;
storing the information for updating the data stored in the first sandbox in the queue when the first sandbox is in the locked mode; and
updating the data stored in the shadow data component.
13. The method according to claim 12, further comprising:
updating the data stored in the first sandbox based on the information for updating the data stored in the first sandbox stored in the queue when the first sandbox enters the unlocked mode.
14. The method according to claim 10, wherein both the first sandbox and the second sandbox are controlled exclusively by a single operating system, the data stored in the first sandbox is encrypted, and the data stored in the shadow data component is a redundant subset of the data stored in the first sandbox.
15. The method according to claim 10, further comprising displaying an update on the display using the data stored in the shadow data component when the first sandbox is in the locked mode.
16. The method according to claim 15, wherein the update is selected from the group consisting of a calendar reminder, an email notification, and a contact list entry.
17. The method according to claim 12, wherein an element of data that is stored in both the first sandbox and the shadow data component is associated by a first identifier and an element of data that is stored in both the queue and the shadow data component is associated by a second identifier.
18. The method according to claim 10, wherein when the first sandbox is in the locked mode, all data stored in the first sandbox is inaccessible except for data stored in a start-up area of the first sandbox until access to the first sandbox is authenticated and wherein the shadow data component is stored in the start-up area.
19. A computer program product comprising a computer readable medium having stored thereon computer executable instructions that when executed by a computer perform a method for use on the computer having a display, a communication component, a memory storing data in a first sandbox and data in a second sandbox, the first sandbox being a secure sandbox and having a shadow data component, the shadow data component storing a subset of the data stored in the first sandbox, and a processor coupled to the display, the communication component, and the memory, the method comprising:
in response to a request:
providing the data stored in the first sandbox when the first sandbox is in an unlocked mode; and
providing the data stored in the shadow data component when the first sandbox is in a locked mode.

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 to form vehicle engine air intake device, said method comprising:
providing a conductive loaded, resin-based material comprising conductive materials in a resin-based host; and
molding said conductive loaded, resin-based material into a vehicle engine air intake device comprising a hollow air transporting structure.
2. The method according to claim 1 wherein the percent by weight of said conductive materials is between about 20% and about 50% of the total weight of said conductive loaded resin-based material.
3. The method according to claim 1 wherein said conductive materials comprise micron conductive fiber.
4. The method according to claim 2 wherein said conductive materials further comprise conductive powder.
5. The method according to claim 1 wherein said conductive materials are metal.
6. The method according to claim 1 wherein said conductive materials are non-conductive materials with metal plating.
7. The method according to claim 1 wherein said step of molding comprises:
injecting said conductive loaded, resin-based material into a mold;
curing said conductive loaded, resin-based material; and
removing said vehicle fuel delivery device from said mold.
8. The method according to claim 1 wherein said step of molding comprises:
loading said conductive loaded, resin-based material into a chamber;
extruding said conductive loaded, resin-based material out of said chamber through a shaping outlet; and
curing said conductive loaded, resin-based material to form said vehicle fuel delivery device.
9. A method to form a vehicle engine air intake device, said method comprising:
providing a conductive loaded, resin-based material comprising conductive materials in a resin-based host wherein the percent by weight of said conductive materials is between 20% and 40% of the total weight of said conductive loaded resin-based material; and
molding said conductive loaded, resin-based material into a vehicle engine air intake device comprising a hollow air transporting structure.
10. The method according to claim 9 wherein said conductive materials are nickel plated carbon micron fiber, stainless steel micron fiber, copper micron fiber, silver micron fiber or combinations thereof.
11. The method according to claim 9 wherein said conductive materials comprise micron conductive fiber and conductive powder.
12. The method according to claim 11 wherein said conductive powder is nickel, copper, or silver.
13. The method according to claim 11 wherein said conductive powder is a non-metallic material with a metal plating.
14. The method according to claim 9 wherein said hollow structure is a pipe or hose.
15. The method according to claim 9 wherein said hollow structure is a manifold.
16. The method according to claim 9 wherein said hollow structure is the housing of a turbo charger.
17. The method according to claim 9 wherein said hollow structure is the housing of a throttle valve.
18. The method according to claim 9 wherein said conductive loaded resin-based material further comprises a ferromagnetic material.
19. A method to form a vehicle engine air intake device, said method comprising:
providing a conductive loaded, resin-based material comprising micron conductive fiber in a resin-based host wherein the percent by weight of said micron conductive fiber is between 20% and 50% of the total weight of said conductive loaded resin-based material; and
molding said conductive loaded, resin-based material into a vehicle engine air intake device comprising a hollow air transporting structure.
20. The method according to claim 19 wherein said micron conductive fiber is stainless steel.
21. The method according to claim 19 wherein said micron conductive fiber has a diameter of between about 3 \u03bcm and about 12 \u03bcm and a length of between about 2 mm and about 14 mm.
22. The method according to claim 19 wherein said hollow structure is an exhaust manifold.
23. The method according to claim 19 wherein said hollow structure is a muffler.
24. The method according to claim 19 wherein said conductive loaded resin-based material further comprises a ferromagnetic material.
25. The method according to claim 19 further comprising plating said conductive loaded resin-based material with a metal plating.

What is claimed is:

1. An apparatus for detecting and measuring foam in wastewater, comprising:
a vertically positioned tubular column having an inner wall, said tubular column having first and second openings disposed within an upper portion of said tubular column;
programmable logic control means for generating a plurality of control signals, said programmable logic control means enabling and controlling operation of said apparatus by generating said plurality of control signals;
first valve means having an inlet port for receiving a sample of said wastewater and an outlet port connected to the first opening of said tubular column, said first valve means, responsive to a first of said plurality of said control signals, opening to allow said wastewater to pass through the first opening of said tubular column and flow down the inner wall of said tubular column to a lower portion of said tubular column;
air supply means, responsive to a second of said plurality of control signals, generating compressed air;
second valve means having an inlet port connected to said air supply means to receive said compressed air, a first outlet port connected to the second opening of said tubular column and a second outlet port, said second valve means being activated by a third of said plurality of control signals;
said second valve means diverting said compressed air through the first outlet port thereof and the second opening of said tubular column into said tubular column when said second valve means is deactivated, said valve means directing said compressed air through the second outlet port thereof when said second valve means is activated;
an aeration stone positioned in the lower portion of said tubular column, said aeration stone having an inlet port connected to the second outlet port of said second valve means to receive said compressed air directed through the second outlet port of said second valve means;
said aeration stone upon receiving said compressed air from said second valve means generating air bubbles within said wastewater causing a formation of said foam within said tubular column;
third valve means having an inlet port connected to the lower portion of said tubular column and an outlet port, said third valve means, responsive to a fourth of said plurality of control signals, opening to allow said wastewater and said foam to drain from said tubular column;
a spherical shaped float positioned above the lower portion of said tubular column, said foam raising said spherical shaped float in an upward direction within the upper portion said tubular column;
measuring means positioned at the top of said spherical column, said measuring means generating ultrasonic waves, said measuring means measuring time of travel for said ultrasonic waves between said measuring means and said spherical shaped float, said measuring means providing an analog signal which is a function of foam height within said tubular column;
optical sensing means for measuring a density of said foam within the upper portion of said tubular column, said optical sensing means providing a electrical signal representative of the density of said foam within the upper portion of said tubular column;
said programmable logic control means simultaneously deactivating said second valve means and opening said third valve means diverting said compressed air from said aeration stone to the upper portion of said tubular column forcing said wastewater and said foam out of said tubular column through said third valve means.
2. The apparatus of claim 1 wherein said first valve means comprises a fill valve.
3. The apparatus of claim 1 wherein said second valve means comprises a three way air valve.
4. The apparatus of claim 1 wherein said third valve means comprises a drain valve.
5. The apparatus of claim 1 further comprising:
a flow direction sensing switch having an inlet port for receiving samples of said wastewater and an outlet port;
a backwash strainer having an inlet port connected to the outlet port of flow direction sensing switch and an outlet port, said backwash strainer removing particulate matter from the samples of said wastewater; and
a filter having an inlet port connected to the outlet port of said backwash strainer and an outlet port connected to said first valve means, said filter including an oleophilic element for removing oil from the samples of said wastewater.
6. The apparatus of claim 5 further comprising a shut off valve having an inlet port for receiving the samples of said wastewater and an outlet port connected to the inlet port of said flow direction sensing switch.
7. The apparatus of claim 1 further comprising:
a vertically positioned holding tank having an inlet port connected to the outlet port of said third valve means;
a sump pump having an inlet port connected to the outlet port of said holding tank;
an upper float switch mounted within said holding tank at a top end of said holding tank; and
a lower float switch mounted within said holding tank at a lower end of said holding tank at a bottom end of said tank; and
said upper limit switch and said lower limit switch being connected to programmable logic control means.
8. The apparatus of claim 1 wherein said measuring means comprises an ultrasonic sensor.
9. The apparatus of claim 1 wherein said optical sensing means comprises a pair of photo optical sensors which are in alignment and are positioned on opposite sides of the upper portion of said tubular column, a first of said photo optical sensors operating as a transmitter which projects a beam of light through the upper portion of said tubular column and a second of said photo optical sensors operating as receiver to receive said beam of light.
10. The apparatus of claim 1 wherein said programmable logic control means receives said analog signal from said measuring means and said electrical signal from said optical sensing means, said programmable logic control means processing said analog signal and said electrical signal to generate an alarm signal.
11. The apparatus of claim 10 further comprising a red indicating light connected to said programmable logic control means to receive said alarm signal, said alarm signal illuminating said red indicating light to alert a user of said apparatus that foam concentration within said wastewater is above a predetermined threshold of approximately 15 ppm of aqueous foam forming film.
12. An apparatus for detecting and measuring foam in wastewater, comprising:
a vertically positioned tubular column having an inner wall, said tubular column having first and second openings disposed within an upper portion of said tubular column;
a programmable logic controller for generating a plurality of control signals, said programmable logic controller enabling and controlling operation of said apparatus by generating said plurality of control signals;
a fill valve having an inlet port for receiving a sample of said wastewater and an outlet port connected to the first opening of said tubular column, said fill valve, responsive to a first of said plurality of said control signals, opening to allow said wastewater to pass through the first opening of said tubular column and flow down the inner wall of said tubular column to a lower portion of said tubular column;
an air supply source, responsive to a second of said plurality of control signals, generating compressed air;
an air valve having an inlet port connected to said air supply source to receive said compressed air, a first outlet port connected to the second opening of said tubular column and a second outlet port, said air valve being activated by a third of said plurality of control signals;
said air valve diverting said compressed air through the first outlet port thereof and the second opening of said tubular column into said tubular column when said air valve is deactivated, said air valve directing said compressed air through the second outlet port thereof when said air valve is activated;
an aeration stone positioned in the lower portion of said tubular column, said aeration stone having an inlet port connected to the second outlet port of said air valve to receive said compressed air directed through the second outlet port of said air valve;
said aeration stone upon receiving said compressed air from said air valve generating air bubbles within said wastewater causing a formation of said foam within said tubular column;
a drain valve having an inlet port connected to the lower portion of said tubular column and an outlet port, said drain valve, responsive of to a fourth of said plurality of control signals, opening to allow said wastewater and said foam to drain from said tubular column;
a spherical shaped float positioned above the lower portion of said tubular column, said foam raising said spherical shaped float in an upward direction within the upper portion said tubular column;
an ultrasonic sensor positioned at the top of said spherical column, said ultrasonic sensor generating ultrasonic waves, said ultrasonic sensor measuring time of travel for said ultrasonic waves between said ultrasonic sensor and said spherical shaped float, said ultrasonic sensor providing an analog signal which is a function of foam height within said tubular column;
a pair of photo optical sensor positioned in alignment on opposite sides of the upper portion of said tubular column to measure a density for said foam within the upper portion of said tubular column;
a first of said pair of photo optical sensors directing a beam of light through the upper portion of said tubular column, said beam of light when directed through the upper portion of said tubular column providing an indication of the density of said foam within the upper portion of said tubular column;
a second of said pair of photo optical sensors receiving said beam of light and providing a foam density indicating signal representative of the density of said foam within the upper portion of said tubular column;
said programmable logic controller simultaneously deactivating said air valve and opening said drain valve diverting said compressed air from said aeration stone to the upper portion of said tubular column forcing said wastewater and said foam out of said tubular column through said drain valve.
13. The apparatus of claim 12 further comprising:
a flow direction sensing switch having an inlet port for receiving samples of said wastewater and an outlet port;
a backwash strainer having an inlet port connected to the outlet port of flow direction sensing switch and an outlet port, said backwash strainer removing particulate matter from the samples of said wastewater; and
a filter having an inlet port connected to the outlet port of said backwash strainer and an outlet port connected to said fill valve, said filter including an oleophilic element for removing oil from the samples of said wastewater.
14. The apparatus of claim 13 further comprising a shut off valve having an inlet port for receiving the samples of said wastewater and an outlet port connected to the inlet port of said flow direction sensing switch.
15. The apparatus of claim 12 further comprising:
a vertically positioned holding tank having an inlet port connected to the outlet port of said drain valve;
a sump pump having an inlet port connected to the outlet port of said holding tank;
an upper float switch mounted within said holding tank at a top end of said holding tank; and
a lower float switch mounted within said holding tank at a lower end of said holding tank at a bottom end of said tank; and
said upper limit switch and said lower limit switch being connected to said programmable logic controller.
16. The apparatus of claim 12 wherein said programmable logic controller is connected to said ultrasonic sensor to receive said analog signal, said programmable logic controller being connected to the second of said pair of photo optical sensors to receive said foam density indicating signal, said programmable logic controller processing said analog signal and said foam density indicating signal to generate an alarm signal.
17. The apparatus of claim 16 further comprising a red indicating light connected to said programmable logic controller to receive said alarm signal, said alarm signal illuminating said red indicating light to alert a user of said apparatus that foam concentration within said wastewater is above a predetermined threshold of approximately 15 ppm of aqueous foam forming film.
18. An apparatus for detecting and measuring foam in wastewater, comprising:
a vertically positioned tubular column having an inner wall, said tubular column having first and second openings disposed within an upper portion of said tubular column;
a programmable logic controller for generating a plurality of control signals, said programmable logic controller enabling and controlling operation of said apparatus by generating said plurality of control signals;
a fill valve having an inlet port for receiving a sample of said wastewater and an outlet port connected to the first opening of said tubular column, said fill valve, responsive to a first of said plurality of said control signals, opening to allow said wastewater to pass through the first opening of said tubular column and flow down the inner wall of said tubular column to a lower portion of said tubular column;
an air supply source, responsive to a second of said plurality of control signals, generating compressed air;
an air valve having an inlet port connected to said air supply source to receive said compressed air, a first outlet port connected to the second opening of said tubular column and a second outlet port, said air valve being activated by a third of said plurality of control signals;
said air valve diverting said compressed air through the first outlet port thereof and the second opening of said tubular column into said tubular column when said air valve is deactivated, said air valve directing said compressed air through the second outlet port thereof when said air valve is activated;
an aeration stone positioned in the lower portion of said tubular column, said aeration stone having an inlet port connected to the second outlet port of said air valve to receive said compressed air directed through the second outlet port of said air valve;
said aeration stone upon receiving said compressed air from said air valve generating air bubbles within said wastewater causing a formation of said foam within said tubular column;
a drain valve having an inlet port connected to the lower portion of said tubular column and an outlet port, said drain valve, responsive of to a fourth of said plurality of control signals, opening to allow said wastewater and said foam to drain from said tubular column;
a spherical shaped float positioned above the lower portion of said tubular column, said foam raising said spherical shaped float in an upward direction within the upper portion said tubular column;
an ultrasonic sensor positioned at the top of said spherical column, said ultrasonic sensor generating ultrasonic waves, said ultrasonic sensor measuring time of travel for said ultrasonic waves between said ultrasonic sensor and said spherical shaped float, said ultrasonic sensor providing an analog signal which is a function of foam height within said tubular column;
a pair of photo optical sensor positioned in alignment on opposite sides of the upper portion of said tubular column to measure a density for said foam within the upper portion of said tubular column;
a first of said pair of photo optical sensors directing a beam of light through the upper portion of said tubular column, said beam of light when directed through the upper portion of said tubular column providing an indication of the density of said foam within the upper portion of said tubular column;
a second of said pair of photo optical sensors receiving said beam of light and providing a foam density indicating signal representative of the density of said foam within the upper portion of said tubular column;
said programmable logic controller simultaneously deactivating said air valve and opening said drain valve diverting said compressed air from said aeration stone to the upper portion of said tubular column forcing said wastewater and said foam out of said tubular column through said drain valve;
said programmable logic controller being connected to said ultrasonic sensor to receive said analog signal, said programmable logic controller being connected to the second of said pair of photo optical sensors to receive said foam density indicating signal, said programmable logic controller processing said analog signal and said foam density indicating signal to generate an alarm signal; and
an indicating light connected to said programmable logic controller to receive said alarm signal, said alarm signal illuminating said indicating light to alert a user of said apparatus that foam concentration within said wastewater is above a predetermined threshold of approximately 15 ppm of aqueous foam forming film.
19. The apparatus of claim 18 further comprising:
a shut off valve having an inlet port for receiving samples of said wastewater and an outlet port;
a flow direction sensing switch having an inlet port connected to the outlet port of said shut off valve and an outlet port, said flow direction sensing switch being connected to said programmable logic controller;
a backwash strainer having an inlet port connected to the outlet port of flow direction sensing switch and an outlet port, said backwash strainer removing particulate matter from the samples of said wastewater;
a filter having an inlet port connected to the outlet port of said backwash strainer and an outlet port connected to said fill valve, said filter including an oleophilic element for removing oil from the samples of said wastewater.
20. The apparatus of claim 18 further comprising:
a vertically positioned holding tank having an inlet port connected to the outlet port of said drain valve;
a sump pump having an inlet port connected to the outlet port of said holding tank;
an upper float switch mounted within said holding tank at a top end of said holding tank; and
a lower float switch mounted within said holding tank at a lower end of said holding tank at a bottom end of said tank; and
said upper limit switch and said lower limit switch being connected to said programmable logic controller.

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 chipper comprising:
a feed surface;
a lower feed roller, the lower feed roller being mounted to the chipper such that the axis of rotation of the lower feed roller is below the feed surface;
an upper feed roller, the upper feed roller being mounted to the chipper such that the axis of rotation is movable towards and away from the feed surface;
a hydraulic cylinder for applying a force on the upper feed roller;
a sensor for sensing the position of the upper feed roller; and
a control unit controlling the hydraulic cylinder based on the measured position of the upper feed roller;
wherein the control unit is configured such that the hydraulic cylinder exerts a downward force on the upper feed roller only after the upper feed roller is displaced by a predetermined amount.
2. The chipper of claim 1, wherein the upper and lower feed rollers are generally cylindrical in shape and wherein the axes of rotation of the upper and lower feed rollers are offset in a vertical direction.
3. The chipper of claim 2, wherein the lower feed roller is positioned rearward relative to the upper feed roller.
4. The chipper of claim 2, wherein the upper and lower feed rollers overlap in the vertical direction.
5. The chipper of claim 2, further comprising a mounting arm that is pivotally connected to the chipper frame and connected to an end of the upper feed roller and an end of the hydraulic cylinder.
6. The chipper of claim 1, wherein the control unit is configured to increase the pressure within the hydraulic cylinders when the vertical distance between the feed rollers increases.
7. The chipper of claim 6, wherein the pressure is not increased beyond a predetermined valued once the distance between the feed rollers is greater than a predetermined value.
8. The chipper of claim 1, wherein the control unit is configured to set a constant pressure within the hydraulic cylinders based on the vertical distance between the feed rollers.
9. The chipper of claim 1, wherein the control unit is configured to turn off and on the pressure within the hydraulic cylinder when the vertical distance between the feed rollers increases.
10. The chipper of claim 1, wherein the pressure within the hydraulic cylinders is primarily driven by a hydraulic motor that is not used to drive the rotation of the upper and lower feed rollers.
11. The chipper of claim 10, wherein the control unit is configured such that the operator can cause hydraulic fluid to flow from hydraulic motors used to drive the rotation of the upper and lower feed rollers to drive the hydraulic cylinders.
12. The chipper of claim 1, wherein the control unit is configured such that the hydraulic cylinders apply a force on the upper feed roller only after the upper feed roller is displaced by the predetermined amount and a predetermined time delay after the upper feed roller makes initial contact with material to be reduced has been exceeded.
13. A chipper comprising:
an infeed roller movably mounted to a chipper frame;
a sensor for sensing the position of the infeed roller;
a hydraulic cylinder for applying a force to the infeed roller in response to the measured position of the infeed roller; and
a control unit configured such that the hydraulic cylinder applies force on the upper feed roller only after the feed roller is displaced by a predetermined amount.
14. The chipper of claim 13, wherein the sensor is a rotary potentiometer.
15. The chipper of claim 13, wherein the sensor is a limit switch.
16. The chipper of claim 13, further comprising a controller that varies the pressure in the hydraulic cylinders as a function of the position of the feed roller.
17. The chipper of claim 13, further comprising a first pump configured to drive the rotation of the infeed roller and configured to drive the hydraulic cylinder to manually raise the infeed roller; a second pump configured to drive the hydraulic cylinder to bias the infeed roller in the downward direction, wherein the fluid pressure generated by the second pump is independent from the fluid pressure generated by the first pump.
18. The chipper of claim 17, wherein the second pump has a displacement of less than 0.1 cubic inches per revolution.
19. The chipper of claim 17, wherein the first pump has a greater displacement than the second pump.
20. The chipper of claim 17, wherein the pumps are arranged and configured so that the pressure in the hydraulic cylinder can be varied while the pressure used to drive the infeed rollers is constant.
21. The chipper of claim 13, wherein the control unit is configured such that the hydraulic cylinder applies force on the upper feed roller only after the upper feed roller is displaced by the predetermined amount and a predetermined time delay after the feed roller makes initial contact with material to be reduced has been exceeded.
22. The chipper of claim 13, wherein the control unit is configured such that the hydraulic cylinder applies continuous and linear force on the feed roller after the feed roller exceeds a predetermined displacement.
23. The chipper of claim 22, wherein the continuous and linear force on the feed roller is a constant force.
24. A chipper comprising:
a feed surface;
a first feed roller;
a second feed roller;
a hydraulic cylinder for directing at least one of the first or second feed rollers toward each other;
a sensor for sensing the gap between the first and second feed rollers; and
a control unit controlling the actuation of the hydraulic cylinder based on the measured gap;
wherein the control unit is configured such that the hydraulic cylinder applies a force biasing the first or second feed rollers toward each other only after the gap exceeds a predetermined amount.
25. The chipper of claim 24, wherein each feed roller is cylindrical in shape and includes a horizontally disposed rotational axis.
26. The chipper of claim 24, further comprising a first pump and a second pump, wherein the first pump is used primarily to drive the infeed rollers and the second pump is used primarily to drive the hydraulic cylinders.
27. The chipper of claim 26, wherein the first and second pumps are not identical and are in fluid communication with each other.
28. The chipper of claim 26, wherein the first pump is configured and arranged such that it can be used to drive the hydraulic cylinders.
29. The chipper of claim 24, wherein the control unit is configured such that the hydraulic cylinder applies a force biasing the first or second feed rollers toward each other only after the upper feed roller is displaced by the predetermined amount and a predetermined time delay based on the position of the material to be reduced has been exceeded.