| 摘要 |
This invention relates to a method of placing an elastomeric annular piston seal beyond an irregularity in the wall of a bore without damaging the seal and also to apparatus having a piston seal so placed. The seal is fitted onto a smaller diameter portion of the piston than that on which the seal operates so that when the piston is inserted into the bore, the seal moves freely past and is placed beyond the irregularity. When the seal is beyond the irregularity it is moved from the smaller diameter portion onto its operable position by relative movement of the piston past an abutment which is encountered by the seal. Such a method of assembly is particularly useful for motor vehicle brake master cylinder failure warning switch assemblies. |
