| 摘要 |
PCT No. PCT/US82/00479 Sec. 371 Date Apr. 18, 1983 Sec. 102(e) Date Apr. 18, 1983 PCT Filed Apr. 16, 1982 PCT Pub. No. WO83/03681 PCT Pub. Date Oct. 27, 1983.An improved biased electrode (54) as used in a tire defect tester (12) is the subject of this patent application. The electrode (54) is movable between a first position located within a circle circumscribed by the beads (28) of a tire (26) being tested and a second position received in a cavity between the sidewalls (30) of the tire (26) in engagement with an underside of the tread portion (38) of the tire (26). The electrode (54) includes at least one, and, in a preferred embodiment, two, elongated member (72). The member (72) is pivotally mounted so that, as the electrode (54) is moved from its first to its second position, a first arm portion (80) will engage the underside of the tread portion (38) of the tire (26) and cause the element (72) to pivot so that it is in engagement with the underside of the tread portion (38) substantially along the length of the element (72). During operation, an electric charge is given to the electrode (54), thereby imposing a potential across the electrode (54) and a neutral reference electrode (36) positioned on the other side of the tread portion (38) of the tire (26). If defects exist in the portions of the tire (26) sandwiched between the electrodes (36, 54), an arc will occur thereacross. |
