Joints and connections – Interfitted members – Longitudinally splined or fluted rod
Reexamination Certificate
2001-05-07
2003-06-17
Sandy, Robert J. (Department: 3677)
Joints and connections
Interfitted members
Longitudinally splined or fluted rod
C403S274000
Reexamination Certificate
active
06579031
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to a servo-arm for transferring control motion from a servo-motor to control members.
2. Description of Related Art
A servo-motor generally has a servo-motor spline protruding from the servo. When the motor is activated, the servo-motor spline can turn in either a clockwise or a counterclockwise direction. A servo-motor requires a servo arm or wheel to transfer control motion from the servo-motor to control members. In the past, servo-arms were formed of plastic materials. These arms were coupled to either cables or metal control rods and also to servo-output shafts.
The arm is subjected to high stress in reversed directions. This wears on the arm leading to ever-increased likelihood of failure. The wear also increases the lateral play in the arm-servomotor connection. A small amount of lateral play allows the arm to move loosely, which creates leads to more lateral play.
One attempt to overcome the limitations of the plastic servo-wheel was to provide a wheel in the form of a rigid metal disc. The traditional configuration was to have a hub at the center of the disc having a through bore broached for keyed connection to the servo-motor spline. Further improvements of the traditional design included more efficient methods to manufacture the servo-wheel. One such improvement in manufacture is shown in Siner 5,762,439.
Unfortunately, the traditional design does not ameliorate problems with lateral play. The foregoing illustrates limitations of the known prior art.
SUMMARY OF THE INVENTION
A servo-member comprises a rigid body having first and second opposed planar surfaces; a moderate protruding member formed on the first surface; a first bore through the moderate protruding member, said first bore having a first diameter including a splined portion terminating adjacent an annular seat; a hub in the second surface, said hub forming a second bore, the second bore separated from the first bore by said annular seat, said annular seat having an opening formed to connect the first bore with said second bore.
REFERENCES:
patent: 1990990 (1935-02-01), Hathorn
patent: 2948558 (1960-08-01), Schultz
patent: 4220054 (1980-09-01), Kuhlman
patent: 4226454 (1980-10-01), Tranberg et al.
patent: 5492024 (1996-02-01), Siner
patent: 5671904 (1997-09-01), Minutillo
patent: 5762439 (1998-06-01), Siner
patent: 6161982 (2000-12-01), Cole
Sandy Robert J.
Wu Charles C. H.
Wu & Cheung, LLP
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