Variable-area nozzle

• US 3,143,293 A
• Filed: 04/13/1961
• Issued: 08/04/1964
• Est. Priority Date: 04/13/1961
• Status: Expired due to Term

• Current Assignee: Frank V. Purse
• Original Assignee: Frank V. Purse
• Inventors: Purse, Frank V.
• Application Number:
  US04/102,677
• Time in Patent Office: 1,209 Days
• US Class Current: 239/397.5
• CPC Class Codes: F01N 2470/30 Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
• CPC Class Codes: F01N 3/22 Control of additional air supply only, e.g. using by-passes or variable air pump drives
• CPC Class Codes: F01N 3/34 using air conduits or jet air pumps, e.g. near the engine exhaust port
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Claims

1. A NOZZLE COMPRISING A HOLLOW FRUSTO-CONICAL MEMBER TERMINATING IN AN OPENING OF REDUCED CROSS-SECTION, THE INTERIOR SURFACE OF SAID FRUSTO-CONICAL MEMBER WHICH IS ADJACENT TO SAID OPENING BEING FORMED INTO A REGULAR PYRAMIDAL FRUSTUM OF N FLAT SURFACES WHERE N IS AN INTEGER GREATER THAN 2, A HOLLOW OPEN-ENDED REGULAR PYRAMIDAL FRUSTUM INSERT MEMBER OF N SIDES DEFINED BY RELATIVELY THIN FLAT LATERAL WALLS WHOSE LONGITUDINAL EDGES LIE IN ABUTTING CONTACT AND HAVING A TAPER ANGLE SUBSTANTIALLY EQUAL TO THAT OF SAID FIRST-MENTIONED FRUSTUM, THE OPEN MAJOR BASE OF SAID INSERT MEMBER HAVING A GREATER PERIMETER THAN SAID OPENING AND THE OPEN MINOR BASE OF SAID INSERT MEMBER HAVING A SMALLER PERIMETER THAN SAID OPENING AND AT LEAST TWO ADJACENT LONGITUDINAL EDGES OF SAID INSERT MEMBER BEING CONTINUOUSLY SLIT OVER AT LEAST A PORTION OF THEIR LENGTH INCLUDING THE MINOR BASE PORTION OF THE LATERAL WALL DEFINED BY SAID EDGES, SAID INSERT MEMBER BEING FITTED WITHIN SAID FRUST-CONICAL MEMBER AND PROTRUDING THROUGH THE OPENING THEREOF SO THAT THE MAJOR BASE PORTION OF EACH LATERAL WALL OF THE INSERT MEMBER IS IN UNIFORM AND CO-EXTENSIVE CONTACT WITH A CORRESPONDING FLAT SURFACE OF THE FRUSTO-CONICAL MEMBER, THE LATERAL WALL OF SAID INSERT MEMBER WHICH IS DEFINED BY SAID SLIT EDGES FORMING A RESILIENT CANTILIVER DEFLECTION MEMBER FREE TO DEFLECT OUTWARDLY FROM THE LONGITUDINAL AXIS OF SAID INSERT MEMBER AND INDEPENDENTLY OF THE OTHER LATERAL WALLS.