| 摘要 |
Reciprocal attitude angle self-differentiating device (10) for pivotable wheels (11,12;110) of handtrucks, each of said wheels (11,12;110) being respectively rotatably mounted about a substantially horizontal axis (22,23;220) belonging to a wheel supporting body (21,15;210), said body (21,15;210) being rotatably mounted about a substantially vertical axis (29,30;290), in which at least one pair of wheels belonging to said handtruck being mutually coupled by means of a device (10) comprising: a) first coupling means (14), cooperating with the supporting body (15) of the first (12) of the wheels belonging to said pair; b) second coupling means (13,25;130, 250) freely movable mounted on the supporting body (21;210) of the second wheel (11;110) belonging to said pair of wheels, said second means (13,25;130,250) cooperating with third means (16,24;240) integral and rigidly connected with said supporting body (21;210) of said second wheel (11;110); c) fourth, motion transmitting, means (20), cooperating with said first (14) and said second (13,25;130,250) coupling means; d) fifth means (26,27;34,35,260) being interposed between said second (13,25;130,250) coupling means and said third means (16,24;240) integral and rigidly connected with said supporting body (21;210) of said second wheel (11,110). w |
