Rotary engines

Abstract

This impeller-free vacuum cleaner is based on a rotary piston. Vacuum suction of 300 inches of water or better can be delivered. Quietness of below 70 db can be delivered. Tongued rotary piston assemblies may be strategically placed, such as stacked, to eliminate vacuum suction dead zones. Sealing problems that otherwise were encountered with previous reciprocating and rotary piston structures for vacuum cleaners are solved by using a tongued rotary piston with a double-notched rotary valve operating by a Geneva mechanism, and a novel pancake-shaped cylindrical structure to house the rotary piston. An inventive rotary combustion engine also is disclosed.

1 - 28 . (canceled)  
   
   
       29 . A rotary combustion engine, without any troichoidal chamber.  
   
   
       30 . A rotary piston engine including at least one piston, wherein the piston (i) always follows a purely circular path and/or (ii) does not reciprocate and/or (iii) need not speed up or slow down to operate properly.