Patents by Inventor Robert C. Berfield

Robert C. Berfield has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20020108205
    Abstract: A vacuum cleaner includes a housing having a housing passage with a passage inlet, air entering through the passage inlet flowing in a first direction and the housing passage directing air flowing therethrough in a second direction which is more than 90 degrees different from the first direction. The vacuum cleaner also includes a blower adapted to be used separately from the vacuum cleaner, the blower having a blower housing with a blower inlet, a blower outlet, and defining a blower passage between the blower inlet and the blower outlet, an impeller disposed in the blower passage to move air between the blower inlet and the blower outlet and a motor mounted to the blower housing and coupled to the impeller to move the impeller. The blower is detachably secured to the housing with the blower outlet disposed in communication with the passage inlet.
    Type: Application
    Filed: February 13, 2001
    Publication date: August 15, 2002
    Inventors: Robert C. Berfield, Ronald Griffin, Craig Seasholtz
  • Patent number: 6385853
    Abstract: A rotary device useful for trimming vegetation which automatically feeds two flail lines to establish and maintain two rotary flails.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: May 14, 2002
    Inventor: Robert C. Berfield
  • Patent number: 6381803
    Abstract: A vacuum cleaner capable of drawing different current levels in vacuum and blower modes is disclosed. The vacuum cleaner comprises at least one electric motor and an impeller disposed in an impeller housing, the impeller driven by the at least one electric motor. A receptacle has an inlet and an orifice in fluid communication with the impeller housing, wherein the impeller creates a low pressure area in the receptacle thereby drawing air into the inlet. An outlet is in air flow communication with the impeller housing, wherein air from the impeller is expelled through the outlet. A switch is associated with the outlet, wherein the switch has a first position in which a first current may be drawn by the at least one motor and a second position in which a second current, less than the first current, may be drawn by the at least one motor. A device is removably attached to the outlet for directing air.
    Type: Grant
    Filed: April 5, 2000
    Date of Patent: May 7, 2002
    Assignee: Shop Vac Corporation
    Inventors: Robert C. Berfield, Ronald Griffin, Mark E. Baer
  • Patent number: 6378164
    Abstract: A pump inlet fitting for a wet/dry vacuum cleaner is disclosed. The pump inlet fitting frictionally attaches a pump inlet assembly to an inner surface of an intake tube of a wet/dry vacuum cleaner. The pump inlet fitting includes a plurality of radially extending barbs which frictionally engage the inner surface of the intake tube to a degree sufficient to secure the pump inlet assembly to the intake tube without the need for costly and time consuming external clamping mechanisms.
    Type: Grant
    Filed: July 18, 2000
    Date of Patent: April 30, 2002
    Assignee: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6367118
    Abstract: A vacuum cleaner hose clip is disclosed. The vacuum cleaner hose clip includes a first curvilinear arm adapted to wrap partially around a portion of a vacuum cleaner hose, and a second curvilinear arm adapted to wrap completely around a second portion of a vacuum cleaner hose to hold the vacuum cleaner hose portions together. The clip further includes a locking mechanism to secure the second curvilinear arm in position around the vacuum hose.
    Type: Grant
    Filed: December 8, 2000
    Date of Patent: April 9, 2002
    Assignee: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6358005
    Abstract: A vacuum cleaner includes a driven impeller that moves working air for the vacuum cleaner. A first housing includes a first wall and a second housing includes a second wall opposite the first wall, and an outlet for the working air. The impeller rotates and draws the working air through an opening and directs the working air radially outwardly toward the first wall and then through an annular passage formed between the first wall and the second wall. The annular passage restricts the flow of working are to provide back pressure on the impeller.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: March 19, 2002
    Assignee: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6347430
    Abstract: A vacuum cleaner has an electric motor driving an air impeller for creating suction and a pump impeller which is located in the tank and draws liquid material from the bottom of the tank and expels it from the tank. The vacuum cleaner may have an electrical or mechanical shut-off apparatus which turns off the electric motor if the water level in the tank is too high. The shut-off switch may be bypassed by a user to allow the motor to continue driving the pump impeller to remove liquid from the tank.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: February 19, 2002
    Assignee: Shop Vac Corporation
    Inventors: Randy L. Buss, Robert C. Berfield
  • Publication number: 20010041135
    Abstract: A vacuum cleaner includes a driven impeller that moves working air for the vacuum cleaner. A first housing includes a first wall and a second housing includes a second wall opposite the first wall, and an outlet for the working air. The impeller rotates and draws the working air through an opening and directs the working air radially outwardly toward the first wall and then through an annular passage formed between the first wall and the second wall. The annular passage restricts the flow of working are to provide back pressure on the impeller.
    Type: Application
    Filed: July 24, 2001
    Publication date: November 15, 2001
    Applicant: Shop-Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6309469
    Abstract: A vacuum cleaner includes a receptacle, a motor assembly in air flow communication with the receptacle, and a lid on the receptacle. The vacuum cleaner also includes a hose inlet on the receptacle, a debris opening, and a door opening and closing the debris opening. The debris opening may be on the receptacle or in the lid of the vacuum cleaner. Alternatively, the vacuum cleaner may include an adaptor that is attached to the hose at one end and removably connected to the hose inlet at the other end, where the debris opening is on the adaptor. The vacuum cleaner may have an adaptor that is removably connected to the hose at one end and removably connected to the hose at the other end, where the debris opening is on the adaptor.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: October 30, 2001
    Assignee: Shop Vac Corporation
    Inventors: Charles M. Storrs, Robert C. Berfield
  • Publication number: 20010009051
    Abstract: A pump has a housing defining a pump chamber and having a shaft opening. An impeller shaft extends through the shaft opening and is sized to define a gap between the impeller shaft and the shaft opening. An impeller is attached to the shaft inside the pump chamber. The impeller includes a first set of impeller blades for transporting fluid through the pump chamber and a second set of impeller blades for creating a pressure force which pushes fluid away from the shaft opening. The pump with sealless shaft prevents fluid from leaking through the gap, and therefore is particularly suited for use in a tank-type vacuum cleaner capable of collecting both dry material and fluid. The gap is used in such an application to prime the pump, thereby discharging fluid collected in the tank.
    Type: Application
    Filed: February 20, 2001
    Publication date: July 26, 2001
    Applicant: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6264427
    Abstract: A vacuum cleaner includes a driven impeller that moves working air for the vacuum cleaner. A first housing includes a first wall and a second housing includes a second wall opposite the first wall, and an outlet for the working air. The impeller rotates and draws the working air through an opening and directs the working air radially outwardly toward the first wall and then through an annular passage formed between the first wall and the second wall. The annular passage restricts the flow of working are to provide back pressure on the impeller.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: July 24, 2001
    Assignee: Shop-Vac Corporation
    Inventor: Robert C. Berfield
  • Publication number: 20010005983
    Abstract: A fitting for a vacuum cleaner is disclosed. The fitting includes a retainer having first and second grooves within which a fitting is adapted to slide. The fitting includes a plate from which a cylinder extends and terminates in a radially inwardly directed deflector. Depending upon the orientation of the fitting within the retainer, the incoming fluid stream is directed in an upward or downward direction to thereby facilitate usage of the fitting with or without a vacuum bag, while at the same time minimizing the potential for splashing and expulsion of liquid drawn into the vacuum cleaner.
    Type: Application
    Filed: December 19, 2000
    Publication date: July 5, 2001
    Inventors: Robert C. Berfield, Robert Lent Crevling
  • Patent number: 6249933
    Abstract: A pump has a housing defining a pump chamber and having a shaft opening. An impeller shaft extends through the shaft opening and is sized to define a gap between the impeller shaft and the shaft opening. An impeller is attached to the shaft inside the pump chamber. The impeller includes a first set of impeller blades for transporting fluid through the pump chamber and a second set of impeller blades for creating a pressure force which pushes fluid away from the shaft opening. The pump with sealless shaft prevents fluid from leaking through the gap, and therefore is particularly suited for use in a tank-type vacuum cleaner capable of collecting both dry material and fluid. The gap is used in such an application to prime the pump, thereby discharging fluid collected in the tank.
    Type: Grant
    Filed: August 26, 1999
    Date of Patent: June 26, 2001
    Assignee: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Publication number: 20010001337
    Abstract: A vacuum cleaner includes a receptacle, a motor assembly in air flow communication with the receptacle, and a lid on the receptacle. The vacuum cleaner also includes a hose inlet on the receptacle, a debris opening, and a door opening and closing the debris opening. The debris opening may be on the receptacle or in the lid of the vacuum cleaner. Alternatively, the vacuum cleaner may include an adaptor that is attached to the hose at one end and removably connected to the hose inlet at the other end, where the debris opening is on the adaptor. The vacuum cleaner may have an adaptor that is removably connected to the hose at one end and removably connected to the hose at the other end, where the debris opening is on the adaptor.
    Type: Application
    Filed: March 15, 1999
    Publication date: May 24, 2001
    Applicant: Charles M. Storrs Et Al
    Inventors: CHARLES M. STORRS, ROBERT C. BERFIELD
  • Patent number: 6226831
    Abstract: A pump has a housing defining a pump chamber and having a shaft opening. An impeller shaft extends through the shaft opening and is sized to define a gap between the impeller shaft and the shaft opening. An impeller is attached to the shaft inside the pump chamber. The impeller includes a first set of impeller blades for transporting fluid through the pump chamber and a second set of impeller blades for creating a pressure force which pushes fluid away from the shaft opening. The pump with sealless shaft prevents fluid from leaking through the gap, and therefore is particularly suited for use in a tank-type vacuum cleaner capable of collecting both dry material and fluid. The gap is used in such an application to prime the pump, thereby discharging fluid collected in the tank.
    Type: Grant
    Filed: June 7, 2000
    Date of Patent: May 8, 2001
    Assignee: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6151749
    Abstract: A vacuum cleaner includes a backpack enclosure that removably encloses an impeller/motor unit. The backpack enclosure has a substantially block-shaped outer configuration and is made from a pliable cloth material, preferably composed of woven NYLON fibers. Two shoulder straps are attached to the backpack enclosure for carrying the vacuum cleaner. In accordance with an alternative embodiment of the invention, a vacuum cleaner includes a fanny pack enclosure that removably encloses an impeller/motor unit. The fanny pack enclosure is made from a pliable cloth material, preferably composed of woven NYLON fibers. A harness in the form of a waist strap is attached to the fanny pack enclosure for carrying the vacuum cleaner on the waist of a user.
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: November 28, 2000
    Assignee: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6119304
    Abstract: A vacuum cleaner has an electric motor driving an air impeller for creating low pressure and a pump which draws liquid material through an inlet tube from the bottom of a tank and expels it from the tank. A priming apparatus is disposed between the air impeller and the interior of the pump to place the interior of the pump in air flow communication with a low pressure area generated by the air impeller. With the interior of the pump in air flow communication with the low pressure area generated by the air impeller, the pump is able to draw liquid material received by the tank up through the pump inlet to prime the pump.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: September 19, 2000
    Assignee: Shop Vac Corporation
    Inventors: Robert C. Berfield, Randy L. Buss, Marcus Rhone
  • Patent number: 6112366
    Abstract: A vacuum cleaner has an electric motor driving an air impeller for creating suction and a pump which draws liquid material through an inlet tube from the bottom of a tank and expels it from the tank. A priming mechanism is disposed in fluid communication with the outlet portion of the pump. The priming mechanism primes the pump from the outlet side of the pump by collecting liquid received by the tank of the vacuum cleaner in the priming mechanism and establishing a pressure differential across this collected liquid.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: September 5, 2000
    Assignee: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6107583
    Abstract: A switch assembly having an enlarged actuation surface and enhanced tactility is provided. The switch assembly may include a switch having a movable switch mounted within a recess. The actuation surface may be an elongate planar body loosely held within the recess and in engagement with the movable switch. A flexible protective cover may be provided over the recess, switch and actuation surface. The planar body increases the actuation area of the switch assembly without increasing the size, and accompanying cost, of the switch.
    Type: Grant
    Filed: August 6, 1999
    Date of Patent: August 22, 2000
    Assignee: Shop Vac Corporation
    Inventor: Robert C. Berfield
  • Patent number: 6079076
    Abstract: A vacuum cleaner has an electric motor driving an air impeller for creating suction and a pump which draws liquid material through an inlet tube from the bottom of a tank and expels it from the tank. The vacuum cleaner also includes a non-water soluble collection bag that attaches to a tank inlet and is disposed within the tank. The collection bag filters large particulate material out of the material which is vacuumed into the tank.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: June 27, 2000
    Assignee: Shop-Vac Corporation
    Inventor: Robert C. Berfield