Method of making screw pumps

• US 3,247,580 A
• Filed: 05/09/1962
• Issued: 04/26/1966
• Est. Priority Date: 05/09/1962
• Status: Expired due to Term

• Current Assignee: Morgan B. Sennet
• Original Assignee: Morgan B. Sennet
• Inventors: Sennet, Morgan B.
• Application Number:
  US04/193,507
• Time in Patent Office: 1,448 Days
• US Class Current: 29/888.023
• CPC Class Codes: B23F 15/08 Making intermeshing rotors, e.g. of pumps
• CPC Class Codes: F04C 2/165 having more than two rotary pistons with parallel axes
• CPC Class Codes: Y10T 29/49242 Screw or gear type, e.g., Moineau type
• CPC Class Codes: Y10T 407/15 Rotary broach
• CPC Class Codes: Y10T 407/16 Rectilinear broach
• CPC Class Codes: Y10T 409/400175 Process

Claims

1. THE METHOD OF MAKING A HOUSING FOR A SCREW PUMP OR MOTOR OF THE TYPE HAVING INTERMESHING SCREWS COMPRISING A POWER SCREW HAVING CONVEX THREADS AND AT LEAST ONE IDLER SCREW HAVING CONCAVE THREADS AND A HOUSING HAVING INTERSECTING CYLINDRICAL BORES WITHIN WHICH SAID SCREWS ROTATE, THE METHOD COMPRISING FORMING BY EXTRUSION OF METAL THE HOUSING WITH UNDERSIZED INTERSECTING APPROXIMATELY CYLINDRICAL BORES AND THEN SIMULTANEOUSLY BROACHING SAID BORES TO FINISHED DIMENSIONS BY PASSING THERETHROUGH A BROACH HAVING A MULTILOBED FORM CORRESPONDING TO THE MULTILOBED FORM OF THE INTERSECTING BORES.