United States Patent  [ii] Patent Number: 4,857,881
Hayes'  Date of Patent: Aug. 15, 1989
U.S. Patent Aug. 15,1989 Sheet 1 of 3 4,857,881
 JOYSTICK WITH SPRING DISCONNECT
 Inventor: Charles L. Hayes, Carlsbad, Calif.
 Assignee: Hayes Technology, San Marcos, Calif.
 Appl. No.: 216,830
 Filed: Jul. 8,1988
 Int. a.* H01C 10/16
 U.S. a 338/128; 74/471 XY
 Field of Search 338/128; 74/471 XY
 References Cited
U.S. PATENT DOCUMENTS
4,489,304 12/1984 Hayes 338/128
4,620,176 10/1986 Hayes 338/128
4,763,100 8/1988 Wood 338/128
Primary Examiner—Donald A. Griffin
Attorney, Agent, or Firm—Price, Gess & Ubell
A joystick mechanism having a barrel rotator is capable of multiple axis movement and multiple axis analog signal control. The joystick mechanism can be selectively spring centered on two axes, spring centered on one axis and frictionally positioned on the other, or frictionally positioned on both axes. A pair of switch mechanisms, one for each axis of movement, selectably engage or disengage the respective centering spring mechanism. The analog signal generators are adjustable from the outside to provide biasing as required.
28 Claims, 3 Drawing Sheets