Patents by Inventor Dusan J. Hvolka
Dusan J. Hvolka 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: 20100267508Abstract: A direct drive electric shift two speed planetary gearbox using a linear actuator to engage selectively the ring gear either to the housing or to the carrier by means of a synchronizing clutch to provide a low speed mode, a neutral mode, and a high speed mode of operation resulting in significant fuel efficiencies.Type: ApplicationFiled: April 16, 2009Publication date: October 21, 2010Applicant: DJH Engineering Center, Inc.Inventors: Dusan J. Hvolka, Patriek Hvolka, Viliam Raffaj
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Publication number: 20090247346Abstract: A direct drive electric shift two speed planetary gearbox using a linear actuator to engage selectively planet, sun and ring gears to provide a low speed mode, a neutral mode, and a high speed mode of operation with significant fuel efficiencies.Type: ApplicationFiled: March 25, 2008Publication date: October 1, 2009Inventors: Dusan J. Hvolka, Patrick Hvolka, Viliam Raffaj
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Patent number: 7537536Abstract: A universal two speed gearbox for driving high speed vehicles under high temperature operating conditions, and other devices which require variable operating two speed bearing thrust.Type: GrantFiled: August 26, 2006Date of Patent: May 26, 2009Inventors: Dusan J. Hvolka, Patrick Hvolka
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Publication number: 20070287575Abstract: A universal two speed gearbox for driving high speed vehicles under high temperature operating conditions, and other devices which require variable operating two speed bearing thrust.Type: ApplicationFiled: August 26, 2006Publication date: December 13, 2007Inventors: Dusan J. Hvolka, Patrick Hvolka
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Patent number: 6935986Abstract: A two speed gear box including a casing that is rotatably supported by a central planetary gear carrier. The two speed gear box further includes a central mounted planetary gear assembly with a ring gear controlled by a low speed clutch and a sun gear controlled by a high speed clutch that cooperate to provide three modes of operation for the output shaft with respect to a drive axle. The three modes of operation include a neutral mode, a high speed mode and a low speed mode. Selective engagement and disengagement of the low speed and high speed clutches provide for selection of one of the modes of operation.Type: GrantFiled: August 30, 2002Date of Patent: August 30, 2005Assignee: Darwin Industries, Inc.Inventors: Dusan J. Hvolka, Steve G. Pitts, Cary D. Pitts
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Publication number: 20040266576Abstract: A two speed gear box including a casing that is rotatably supported by a central planetary gear carrier. The two speed gear box further includes a central mounted planetary gear assembly with a ring gear controlled by a low speed clutch and a sun gear controlled by a high speed clutch that cooperate to provide three modes of operation for the output shaft with respect to a drive axle. The three modes of operation include a neutral mode, a high speed mode and a low speed mode. Selective engagement and disengagement of the low speed and high speed clutches provide for selection of one of the modes of operation.Type: ApplicationFiled: August 30, 2002Publication date: December 30, 2004Applicant: Darwin Industries, Inc.Inventors: Dusan J. Hvolka, Steve G. Pitts, Cary D. Pitts
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Patent number: 5356351Abstract: In a shuttlecar wheel end, the wheel unit on which the wheel is mounted is driven by a right angle drive and incorporates first and second planetary gear reduction stages acting sequentially to supply a twice reduced drive to the wheel. Each gear reduction stage has a sun gear meshing with planet gears meshing in turn with a fixed ring gear. The planet gears in each case are carried by a rotatable planet carrier, with the planet carrier of the first reduction stage carrying the sun gear of the second reduction stage. The resulting wheel end is compact in design and does away with the need for an external speed reduction stage.Type: GrantFiled: December 17, 1992Date of Patent: October 18, 1994Assignee: Eimco Mining Machinery (Proprietary) LimitedInventor: Dusan J. Hvolka
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Patent number: 5190123Abstract: A direct drive, self-cooling, fail-safe axle brake system mounted to a drive axle associated with a differential and wheel end of a vehicle. The brake system has two back to back tandem operated combination brake components associated with the wheel end, which is surrounded by a hub cooling and collection reservoir into which fluids from a separate cooling reservoir are circulated over the brake components to dissipate heat generated from braking by dissipating it through the separate cooling reservoir.Type: GrantFiled: July 1, 1991Date of Patent: March 2, 1993Assignee: Cannon Engineering Technologies, Inc.Inventor: Dusan J. Hvolka
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Patent number: 5147011Abstract: A U-shaped multi-purpose uni-body digging service vehicle particularly adapted for transport and hauling comprising: a U-shaped frame having opposing sides and front ends connected by a front piece, and rear ends defining an open interior space in communcation with an open front end; an open top earthmover digging and carrying module structured to fit within and mounted within the interior of the opening of the U-shaped frame to carry loads, wheel mounts capable of pivoting attached to the opposing sides; a plurality of wheels independently suspended and rotatably attached to the wheel mounts; pivot means associated with the wheel mounts to pivot and turn each wheel in a desired direction; independent drive means associated with each wheel to rotate said wheels forward and backward; a power source operably associated with the pivot means and independent drive means; and control means mounted to the frame and associated with the drive means, pivot means, and power source to selectively activate the drive meansType: GrantFiled: July 8, 1991Date of Patent: September 15, 1992Assignee: DJH Engineering Center, Inc.Inventor: Dusan J. Hvolka
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Patent number: 5141384Abstract: An articulated U-shaped multi-purpose vehicle particularly adapted for underground digging and hauling comprising: a digging component having a U-shaped frame having opposing sides and front ends connected by a front piece, and rear ends defining an open interior space in communication with an open front end; wheel mounts capable of pivoting attached to the opposing sides; a plurality of wheels independently suspended and rotatably attached to the wheel mounts; pivots associated with the wheel mounts to pivot and turn each wheel in a desired direction; a digging bucket and drag arm hingedly attached to the front of the frame, and a hingedly attached independent drive component with an engine and wheels to move the wheels forward and backward; and power controls mounted to the frame to selectively activate the digging and drive components to dig and haul rock, ore, and the like.Type: GrantFiled: September 4, 1990Date of Patent: August 25, 1992Inventor: Dusan J. Hvolka
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Patent number: 5120182Abstract: An articulated U-shaped multi-purpose vehicle particularly adapted for underground digging and hauling comprising: a U-shaped frame having opposing sides and front ends connected by a front piece, and rear ends defining an open interior space in communication with an open front end; a bucket load chamber mounted within the U-shaped frame, a liftable bucket loader hingedly attached to the frame to pivotally tilt the bucket loader bottom as it is rearwardly lifted and transported to empty its contents into the bucket load chamber, wheel mounts capable of pivoting attached to the opposing sides; a plurality of wheels independently suspended and rotatably attached to the wheel mounts; pivots associated with the wheel mounts to pivot and turn each wheel in a desired direction; a motor associated with each wheel to rotate the wheels forward and backward; a power source operably associated with the pivots and motors; and controls mounted to the frame and associated with the engine, pivots, and power source is selectType: GrantFiled: September 4, 1990Date of Patent: June 9, 1992Inventor: Dusan J. Hvolka
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Patent number: 5082082Abstract: A U-shaped multi-purpose service vehicle particularly adapted for transport and hauling comprising: A U-shaped frame having opposing sides and front ends connected by a front piece, and rear ends defining an open interior space in communication with an open front end; wheel mounts capable of pivoting attached to the opposing sides; a plurality of wheels independently suspended and rotatably attached to the wheel mounts; pivot means associated with the wheel mounts to pivot and turn each wheel in a desired direction; independent drive means associated with each wheel to rotate said wheels forward and backward; a power source operably associated with the pivot means and independent drive means; and control means mounted to the frame and associated with the drive means, pivot means, and power source to selectively activate the drive means and pivot means to align and drive each wheel at the desired speed and direction.Type: GrantFiled: August 17, 1990Date of Patent: January 21, 1992Assignee: DJH Engineering Center, Inc.Inventor: Dusan J Hvolka
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Patent number: 4856378Abstract: The invention is a variable speed transmission for adjusting the output of a drive shaft. It comprises a journal mounted rotatable casing with an internal cyclical periodic track selectively pushed by a plurality of reciprocating push rods activated by a variably extendable cam mounted to a drive shaft. The torque ratios are directly proportional to the degree the push rods are extended by the extendable cam.Type: GrantFiled: January 21, 1988Date of Patent: August 15, 1989Assignee: DJH Engineering Center, Inc.Inventor: Dusan J. Hvolka