Patent Number: 
Section: claims

1. A tank excavator device for cleaning contaminated tanks, comprising:a mobile vehicle having a front end and a rear end;a gathering arm assembly having a first end and a second end attached to the front end of mobile vehicle, the first end for breaking up waste from a contaminated waste tank;wherein the mobile vehicle includes:a first pair of wheels with a first track of parallel tank threads on a left side of the mobile vehicle; anda second pair of wheels with a second track of parallel tank threads on a right side of the mobile vehicle;a gathering arm assembly having a first end and a second end attached to the front end of mobile vehicle, the first end for breaking up waste from a contaminated waste tank;a bucket assembly on the front end of the mobile vehicle, having a receptacle for collecting the waste from the first end of the gathering arm assembly; anda pump and tank assembly for collecting waste material in the bottom of the contaminated waste tank with a pump. 2. The tank excavator device of claim 1, wherein the gathering arm assembly includes:a scraper on the first end of the gathering arm assembly; anda plurality of hardened tines attached to the scraper. 3. The scraper assembly of claim 2, wherein the wherein the plurality of hardened tines is reciprocated linearly up and down. 4. The tank excavator device of claim 1, wherein the gathering arm assembly includes:a scraper with squeegee on the first end of the gathering arm assembly. 5. The tank excavator device of claim 1, wherein the gathering arm assembly includes:a scraper with squeegee and grinding drum assembly on the first end of the gathering arm assembly. 6. The tank excavator device of claim 1, wherein the gathering arm assembly includes:a pivotable mast with a lower end pivotally attached to the front end of the mobile vehicle, and an upper end; anda boom having a first end pivotally attached the upper end of the mast, and a second end pivotally attached to a base of a scraper. 7. The tank excavator of claim 6, wherein the gathering arm assembly includes:a mast elevation cylinder having a lower end pivotally attached to the mobile vehicle and an upper end pivotally attached to an upper portion of the pivotable mast for controlling pivoting positions of the pivotable mast relative to the mobile vehicle; anda boom elevation cylinder for having a first end pivotally attached to another upper portion of the pivotal mast and a second end pivotally attached to another portion of the base of the scraper. 8. The tank excavator of claim 1, wherein the bucket assembly includes:pivoting arms for allowing the bucket assembly to pivot up or pivot down relative to the front end of the mobile vehicle. 9. The tank excavator of claim 8, wherein the bucket assembly includes:a ramp having a front end which is lowerable to rest on a surface, and a rear end that rises up to the receptacle. 10. A tank excavator device for cleaning contaminated tanks, comprising:a mobile vehicle having a front end and a rear end;a gathering arm assembly having a first end and a second end attached to the front end of mobile vehicle, the first end for breaking up waste from a contaminated waste tank;a bucket assembly on the front end of the mobile vehicle, having a receptacle for collecting the waste from the first end of the gathering arm assembly;pivoting arms for allowing the bucket assembly to pivot up or pivot down relative to the front end of the mobile vehicle;a pump and tank assembly adjacent a rear end of the mobile vehicle, for collecting waste material from the discharge of an eductor in the bottom of the bucket assembly in order to pump the waste material out of the waste tank;a scraper on the first end of the gathering arm assembly;a pivotable mast with a lower end pivotally attached to the front end of the mobile vehicle, and an upper end; anda boom having a first end pivotally attached the upper end of the mast, and a second end pivotally attached to a base of the scraper. 11. The tank excavator of claim 10, wherein the bucket assembly includes:a trough in the receptacle that gravity feeds a screw which feeds the collected waste material into an educator. 12. The tank excavator of claim 11, wherein the bucket assembly includes:a crusher in the receptacle for further breaking down the collected waste material. 13. The tank excavator of claim 11, wherein the bucket assembly includes:a macerator in the receptacle for further breaking down the collected waste material. 14. The tank excavator of claim 10, wherein the bucket assembly includes:a jet educator for pushing broken down material from the collected waste to the pump and tank assembly. 15. The tank excavator of claim 10, further comprising:electrical and controls assembly that includes explosion proof hydraulic valves located outside the contaminated waste tank. 16. A tank excavator device for cleaning contaminated tanks, comprising:a mobile vehicle having a front end and a rear end;a gathering arm assembly having a first end and a second end attached to the front end of mobile vehicle, the first end for breaking up waste from a contaminated waste tank;a bucket assembly on the front end of the mobile vehicle, having a receptacle for collecting the waste from the first end of the gathering arm assembly;a pump and tank assembly for collecting waste material in the bottom of the contaminated waste tank with a pump;electrical and controls assembly having onboard controls and hydraulic valves housed in explosion proof enclosures, andcommunications for the electrical and controls assembly over fiber optics. 17. The electrical and controls assembly of claim 16, further comprising:electrical power is provided by an on-board fluid powered generator.