# US 10,246,851 B2 · Hydrovac > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,246,851 B2 - Document ID: US10246851B2 - Status: Granted - Kind: B2 - Application number: 15/615,347 - Filed: 2017-06-06 - Published: 2018-03-29 - Granted: 2019-04-02 - Earliest claimed: 2016-06-06 - Applicants: Robert Carl Rajewski - Inventors: Robert Carl Rajewski - Web page: https://patentgrep.com/patent/US10246851B2 ## CPC - E02F 3/90: Component parts {, e.g. arrangement or adaptation of pumps} - B60P 1/04: with a tipping movement of load-transporting element (dredgers or soil-shifting machines E02F3/00) - B60P 3/243: {divided by rigid walls} - E02F 3/8816: {Mobile land installations} - E02F 9/08: Superstructures; Supports for superstructures {(arrangements for travelling gear, e.g. undercarriages for wheels, crawlers, caterpillars E02F9/02; for motor vehicles B62D25/00, B62D33/00)} - E02F 9/20: Drives; Control devices (gearings in general F16H; controlling in general G05; electric multi-motor drives H02K, H02P) - F16H 7/08: Means for varying tension of belts, ropes or chains (pulleys of adjustable construction F16H55/52) - F16H 2007/0812: {Fluid pressure} - E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00) - B60P: VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS (vehicles with special provisions for transporting patients or disabled persons, or their personal conveyances A61G3/00) - F16H: GEARING ## Abstract A hydrovac having a chassis, a mud tank and water tank assembly mounted on the chassis, a hydraulic lift assembly capable of raising the mud tank and water tank assembly through a dump angle, the mud tank having a floor, and the floor of the mud tank deepens forwardly. A belt drive is provided for a blower of the hydrovac, along with belt tensioning system. ## Claims ### Claim 1 A hydrovac having a chassis, a mud tank and water tank forming a mud tank and water tank assembly mounted on the chassis, a hydraulic lift assembly capable of raising the mud tank and water tank assembly through a dump angle, the mud tank having a floor and a rear, the floor of the mud tank deepening forwardly, the water tank being located under the mud tank, and a hatch for the mud tank being located at the rear of the mud tank. ### Claim 2 (depends on 1) The hydrovac of claim 1 in which the floor of the mud tank slopes at an angle throughout less than the dump angle. ### Claim 3 (depends on 1) The hydrovac of claim 1 in which the dump angle is greater than the slope of the floor of the mud tank by at least 30 degrees. ### Claim 4 (depends on 1) The hydrovac of claim 1 in which the floor of the mud tank is flat. ### Claim 5 A hydrovac having a chassis, a mud tank and water tank forming a mud tank and water tank assembly mounted on the chassis, a hydraulic lift assembly capable of raising the mud tank and water tank assembly through a dump angle, the mud tank having a floor and a rear, the floor of the mud tank sloping forwardly and downwardly at an angle less than the dump angle, the water tank being located under the mud tank, and a hatch for the mud tank being located at the rear of the mud tank. ### Claim 6 (depends on 5) The hydrovac of claim 5 in which the floor of the mud tank is flat. ### Claim 7 A hydrovac having a chassis, a mud tank and water tank forming a mud tank and water tank assembly mounted on the chassis, a hydraulic lift assembly capable of raising the mud tank and water tank assembly through a dump angle, the mud tank having a floor and a rear, the floor of the mud tank sloping forwardly and downwardly at an angle less than the dump angle, the water tank being located under the mud tank, and a hatch for the mud tank being located at the rear of the mud tank. ### Claim 8 (depends on 7) The hydrovac of claim 7 in which the floor of the mud tank is flat. ### Claim 9 (depends on 1) The hydrovac of claim 1, further comprising: a blower for the mud tank; a split shaft drive system mounted on the chassis; a split shaft box on the split shaft drive system; and a belt drive for the blower powered by the split shaft box. ### Claim 10 (depends on 9) The hydrovac of claim 9 in which the belt drive comprises a drive pulley on the split shaft box, a blower pulley on the blower and a belt connecting the drive pulley and the blower pulley. ### Claim 11 (depends on 10) The hydrovac of claim 10 in which the belt drive comprises a tensioning system for the belt. ### Claim 12 (depends on 11) The hydrovac of claim 11 in which the tensioning system is pneumatically driven. ### Claim 13 (depends on 12) The hydrovac of claim 12 in which the tensioning system comprises an upper air bag and a lower air bag, the upper air bag being arranged to tighten the belt, and the lower air bag being arranged to loosen the belt. ### Claim 14 (depends on 9) The hydrovac of claim 9 in which the mud tank is articulated to the hydrovac vehicle. ### Claim 15 (depends on 1) The hydrovac of claim 1 in which the mud tank is articulated to the chassis. ### Claim 16 (depends on 15) The hydrovac of claim 15 further comprising a drive shaft on the chassis, a blower mounted on the chassis and a belt drive connected between the drive shaft and blower to drive the blower. ### Claim 17 (depends on 16) The hydrovac of claim 16 in which the belt drive has a pneumatically operated tensioning system.