| 摘要 |
1,009,617. Riveting. A.B. METAL PRODUCTS Ltd. Aug. 21, 1964 [May 21, 1963], No. 20232/63. Heading B3U. In a method of securing a thermoplastic knob to a base member so that the knob is secured against removal but is free to rotate the knob 6, has a cylindrical portion 6a which passes through a hole in the base member 1 and is turned over by engaging a spinning member 7 with the portion 6a to heat it and turn it over on to the base member. The description relates particularly to the assembly of a pre-set carbon track variable resistance. |
