Vacuum cleaners especially quiet vacuum cleaners, pumps, and engines

• US 8,272,854 B2
• Filed: 04/29/2005
• Issued: 09/25/2012
• Est. Priority Date: 05/03/2004
• Status: Active Grant

• Current Assignee: Charles A. Castronovo
• Original Assignee: Charles A. Castronovo
• Inventors: Castronovo, Charles A.
• Primary Examiner(s): Kramer, Devon
• Assistant Examiner(s): KASTURE, DNYANESH G
• Application Number:
  US11/117,631
• Publication Number:
  US 20050241102A1
• Time in Patent Office: 2,706 Days
• Field of Search: 418/195, 417/410.3, 417/423.2
• US Class Current: 417/423.2
• CPC Class Codes: A47L 5/20 with bellows, diaphragms or pistons
• CPC Class Codes: F04B 37/14 to obtain high vacuum
• CPC Class Codes: F04B 45/02 having bellows
• CPC Class Codes: F04B 45/022 with two or more bellows in parallel
• CPC Class Codes: F04C 18/28 of other than internal-axis type
• CPC Class Codes: F04C 18/50 the axes being arranged at an angle of 90 degrees

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.

Claims

1. A vacuum cleaner device, having an exterior size of no bigger than about 6 inches by 6 inches by 6 inches, and wherein:

no centrifugal impeller is included,

quiet vacuuming of 75 db or less is provided,

the vacuum cleaner delivers a vacuum suction of at least about 300 inches of water, and

a positive displacement vacuum system is included.