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).
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Publication number: 20020108205Abstract: 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: ApplicationFiled: February 13, 2001Publication date: August 15, 2002Inventors: Robert C. Berfield, Ronald Griffin, Craig Seasholtz
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Patent number: 6385853Abstract: A rotary device useful for trimming vegetation which automatically feeds two flail lines to establish and maintain two rotary flails.Type: GrantFiled: June 26, 2000Date of Patent: May 14, 2002Inventor: Robert C. Berfield
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Patent number: 6381803Abstract: 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: GrantFiled: April 5, 2000Date of Patent: May 7, 2002Assignee: Shop Vac CorporationInventors: Robert C. Berfield, Ronald Griffin, Mark E. Baer
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Patent number: 6378164Abstract: 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: GrantFiled: July 18, 2000Date of Patent: April 30, 2002Assignee: Shop Vac CorporationInventor: Robert C. Berfield
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Patent number: 6367118Abstract: 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: GrantFiled: December 8, 2000Date of Patent: April 9, 2002Assignee: Shop Vac CorporationInventor: Robert C. Berfield
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Patent number: 6358005Abstract: 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: GrantFiled: September 7, 2000Date of Patent: March 19, 2002Assignee: Shop Vac CorporationInventor: Robert C. Berfield
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Patent number: 6347430Abstract: 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: GrantFiled: February 25, 2000Date of Patent: February 19, 2002Assignee: Shop Vac CorporationInventors: Randy L. Buss, Robert C. Berfield
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Publication number: 20010041135Abstract: 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: ApplicationFiled: July 24, 2001Publication date: November 15, 2001Applicant: Shop-Vac CorporationInventor: Robert C. Berfield
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Patent number: 6309469Abstract: 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: GrantFiled: March 15, 1999Date of Patent: October 30, 2001Assignee: Shop Vac CorporationInventors: Charles M. Storrs, Robert C. Berfield
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Publication number: 20010009051Abstract: 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: ApplicationFiled: February 20, 2001Publication date: July 26, 2001Applicant: Shop Vac CorporationInventor: Robert C. Berfield
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Patent number: 6264427Abstract: 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: GrantFiled: February 10, 1999Date of Patent: July 24, 2001Assignee: Shop-Vac CorporationInventor: Robert C. Berfield
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Publication number: 20010005983Abstract: 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: ApplicationFiled: December 19, 2000Publication date: July 5, 2001Inventors: Robert C. Berfield, Robert Lent Crevling
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Patent number: 6249933Abstract: 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: GrantFiled: August 26, 1999Date of Patent: June 26, 2001Assignee: Shop Vac CorporationInventor: Robert C. Berfield
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Publication number: 20010001337Abstract: 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: ApplicationFiled: March 15, 1999Publication date: May 24, 2001Applicant: Charles M. Storrs Et AlInventors: CHARLES M. STORRS, ROBERT C. BERFIELD
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Patent number: 6226831Abstract: 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: GrantFiled: June 7, 2000Date of Patent: May 8, 2001Assignee: Shop Vac CorporationInventor: Robert C. Berfield
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Patent number: 6151749Abstract: 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: GrantFiled: October 22, 1999Date of Patent: November 28, 2000Assignee: Shop Vac CorporationInventor: Robert C. Berfield
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Patent number: 6119304Abstract: 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: GrantFiled: March 30, 1999Date of Patent: September 19, 2000Assignee: Shop Vac CorporationInventors: Robert C. Berfield, Randy L. Buss, Marcus Rhone
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Patent number: 6112366Abstract: 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: GrantFiled: January 20, 1999Date of Patent: September 5, 2000Assignee: Shop Vac CorporationInventor: Robert C. Berfield
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Patent number: 6107583Abstract: 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: GrantFiled: August 6, 1999Date of Patent: August 22, 2000Assignee: Shop Vac CorporationInventor: Robert C. Berfield
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Patent number: 6079076Abstract: 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: GrantFiled: July 31, 1997Date of Patent: June 27, 2000Assignee: Shop-Vac CorporationInventor: Robert C. Berfield