Dusan Hvolka
Engineers in Salt Lake City, UT

6616567, Sep 9, 2003

Oct 10, 2001

09/974107

Victor R. Strong - Tulsa OK
Dusan Jan Hvolka - Salt Lake City UT

Terex Corporation - Westport CT

F16H 5708

475331, 475322

A two speed gear box includes a wheel hub that is rotatably supported by a spindle. The two speed gear box further includes an inboard planetary gear assembly and an outboard planetary gear assembly that cooperate to provide four modes of operation for the wheel hub with respect to a drive axle. The four modes of operation include a neutral mode, a braking mode, a high speed mode and a low speed mode. Selective engagement and disengagement of a clutch in the inboard planetary gear assembly, and selective engagement and disengagement of a clutch in the outboard planetary gear assembly provide for selection of one of the modes of operation.

2005004, Mar 3, 2005

Aug 26, 2003

10/648107

David O'Brien - Dubuque IA, US
Gregory Werner - Durango IA, US
Michael Worley - Sandy UT, US
George Robertson - Spanish Fork UT, US
Dusan Hvolka - Salt Lake City UT, US

A01B059/04

172810000

A Z-bar loader linkage having a floating bell crank. A boom is pivotally mounted to a loader frame at one end and an attachment at the other end. The bell crank is pivotally mounted on leveling links extending forwardly from the loader frame. The drive end of the bell crank is provided with an attachment link that extends from the bell crank to the attachment for controlling the angular position of the attachment. A guide link extends between the attachment link and the boom.

5147011, Sep 15, 1992

Jul 8, 1991

7/726776

Dusan J. Hvolka - Salt Lake City UT

DJH Engineering Center, Inc. - Salt Lake City UT

B60K 17358

180234

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 means and pivot means to align and drive each wheel at the desired speed and direction.

5120182, Jun 9, 1992

Sep 4, 1990

7/577155

Dusan J. Hvolka - Salt Lake City UT

B60P 104

414487

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 selectively activate the engine and pivots to align and drive each wheel at the desired speed and direction.

2010026, Oct 21, 2010

Apr 16, 2009

12/386310

Dusan J. Hvolka - Salt Lake City UT, US
Patriek Hvolka - Salt Lake City UT, US
Viliam Raffaj - Salt Lake City UT, US

DJH Engineering Center, Inc. - Salt Lake City UT

F16H 3/44

475149

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.

5082082, Jan 21, 1992

Aug 17, 1990

7/568767

Dusan J Hvolka - Salt Lake City UT

DJH Engineering Center, Inc. - Salt Lake City UT

B62D 3300

180234

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.

4856378, Aug 15, 1989

Jan 21, 1988

7/146429

Dusan J. Hvolka - Salt Lake City UT

DJH Engineering Center, Inc. - Salt Lake City UT

F16H 128, F16H 5300

74804

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.

5190123, Mar 2, 1993

Jul 1, 1991

7/724188

Dusan J. Hvolka - Salt Lake City UT

Cannon Engineering Technologies, Inc. - UT

F16D 5502

188 716

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.

2009024, Oct 1, 2009

Mar 25, 2008

12/079107

Dusan J. Hvolka - Salt Lake City UT, US
Patrick Hvolka - Salt Lake City UT, US
Viliam Raffaj - Salt Lake City UT, US

F16H 48/06

475155

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.

6935986, Aug 30, 2005

Aug 30, 2002

10/233137

Dusan J. Hvolka - Salt Lake City UT, US
Steve G. Pitts - Coffeyville KS, US
Cary D. Pitts - Coffeyville KS, US

Darwin Industries, Inc. - Coffeyville KS

F16H003/44

475322

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.