Method and apparatus for attachment of a lead screw to a motor shaft

• US 20110072927A1
• Filed: 09/30/2009
• Published: 03/31/2011
• Est. Priority Date: 09/30/2009
• Status: Abandoned Application

• Current Assignee: Don W. Dienst, Russel A. Gilbas
• Original Assignee: Don W. Dienst, Russel A. Gilbas
• Inventors: Gilbas, Russel A., Dienst, Don W.
• Application Number:
  US12/586,895
• Publication Number:
  US 20110072927A1
• Time in Patent Office: Days
• US Class Current: 74/424.76
• CPC Class Codes: F16D 1/092 the pair of conical mating surfaces being provided on the coupled hub and shaft
• CPC Class Codes: F16H 25/20 Screw mechanisms with automatic reversal F16H25/12
• CPC Class Codes: F16H 57/033 Series gearboxes, e.g. gearboxes based on the same design being available in different sizes or gearboxes using a combination of several standardised units
• CPC Class Codes: Y10T 74/19726 Thread pitch varies over axial length

Abstract

A linear actuator arrangement consists of an extended lead screw terminating at one end via a conical section and a threaded rod. After completion of the motor assembly, the threaded rod at the end of the lead screw is later engaged within the threaded aperture to provide linear actuator function.

Claims

1. A lead screw adapter for an electric motor comprising in combination:

a first threaded rod of a first length and a first diameter;

a second threaded rod at an opposite end of said first rod, said second threaded rod being of a shorter length and smaller diameter than said first threaded rod; and

a third threaded rod of a conical configuration intermediate said first and second threaded rods.

2. The lead screw adapter of claim 1 further including means for receiving said first, second and third threaded rods within an electric motor.

3. The lead screw adapter of claim 2 wherein said means for receiving said first, second and third threaded rods comprises a rotor shaft.

4. The lead screw adapter of claim 3 wherein said rotor shaft defines a shaft extension at one end and a conical aperture at an opposite end thereof.

5. The lead screw adapter of claim 4 wherein said rotor shaft includes a pair of bearing journals formed on an outer surface.

6. The lead screw adapter of claim 4 wherein said rotor shaft includes a threaded aperture formed therein in abutment with one end of said conical aperture for receiving said second threaded rod to thereby attach said first, second and third threaded rods to said rotor shaft.

7. The lead screw adapter of claim 6 wherein said rotor shaft further includes a circular aperture formed therein in abutment with one end of said threaded aperture.

8. A combined lead screw adapter and rotor shaft for an electric motor comprising:

a rotor shaft including a shaft extension at one end and a conical aperture at an opposite end thereof;

said rotor shaft further including a threaded aperture formed therein in abutment with one end of said conical aperture and a circular aperture formed therein in abutment with one end of said threaded aperture;

a first threaded rod of a first length and a first diameter;

a second threaded rod at an opposite end of said first rod, said second threaded rod being of a shorter length and smaller diameter than said first threaded rod; and

a third threaded rod of a conical configuration intermediate said first and second threaded rods, whereby said first, second and third threaded rods are attached to said rotor shaft by engagement of said second threaded rod within said threaded aperture formed within said rotor shaft.