Rotary vacuum electric switch

A vacuum valve device, comprising

• a housing having a wall with a substantially flat valve surface thereon inside said housing,
• a plate-like valve carriage having a cavity therein facing said valve surface,
• said wall having a plurality of vacuum distribution ports formed therein and communicating with said valve surface,
• a soft resilient rubber-like plate-like valve member snugly received in said cavity and having vacuum distribution passage means thereon and being slidable along said valve surface for selectively interconnecting said ports,
• guiding means in said housing for guiding said valve carriage for movement of said valve carriage and said valve member along said valve surface,
• and control means for causing said movement of said valve carriage,
• said valve carriage having a plurality of tractor elements thereon projecting into said cavity,
• said valve member having a plurality of blind openings therein for receiving said tractor elements to transmit driving forces between said valve carriage and said valve member and to retain said valve member in said cavity,
• and pressure preventing means disposed within each of said blind openings to prevent buildup of air pressure therein for maintaining said valve member in said cavity.