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Tractive device comprising a belt driven soft roller

  • US 3,311,424 A
  • Filed: 06/03/1965
  • Issued: 03/28/1967
  • Est. Priority Date: 06/03/1965
  • Status: Expired due to Term
First Claim
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12. A TRACTIVE DEVICE FOR VEHICLES OF THE TYPE TO BE MOVED OVER SOFT OR IRREGULAR GROUND, COMPRISING A DRIVING PULLEY HAVING A FIRST PERIPHERY, A RESILIENT SOFT DRIVEN ROLLER MOUNTED FOR ROTATION ABOUT AN AXIS AND HAVING A SECOND PERIPHERY DEFINING A HIGHLY FLEXIBLE RUNNING SURFACE YIELDABLE AND DEFORMABLE TO SURFACE OBSTRUCTIONS, SAID DRIVEN ROLLER BEING SPACED FROM SAID DRIVING PULLEY, AN ENDLESS BELT CONTACTING A PORTION OF SAID FIRST PERIPHERY AND ENCIRCLING SAID SECOND PERIPHERY AND CONTACTING A PORTION OF SAID SECOND PERIPHERY TO TRANSMIT TORQUE FROM SAID FIRST PERIPHERY TO SAID SECOND PERIPHERY, SAID ENDLESS BELT BEING FLEXIBLE TO CONFORM TO THE FULL SHAPE OF THE PORTION OF SAID SECOND PERIPHERY WHICH IT CONTACTS, ALL OF SAID BELT OTHER THAN THAT PORTION CONTACTING SAID SECOND PERIPHERY BEING SPACED ABOVE THE LOWERMOST SURFACE OF SAID SECOND PERIPHERY SO THAT, WHEN SAID TRACTIVE DEVICE IS ON FLAT GROUND, THE ONLY PORTION OF SAID BELT WHICH ENTERS INTO CONTACT WITH SAID GROUND ALSO CONTACTS SAID SECOND PERIPHERY, THE WIDTH AND LENGTH OF THE PROJECTED FOOTPRINT OF SAID DRIVEN ROLLER BEING AT LEAST AS LONG AS THE LOADED RADIUS OF SAID DRIVEN ROLLER.

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