Abstract: This invention provides an improvement in a control stick (e.g., joystick, side-stick, etc.) (20) adapted to control the movement of an object (e.g., an airfoil surface). The improvement includes: a support (21); an intermediately-pivoted upper member (23) mounted on the support, the upper member having an upper portion (24), and lower portion (25); an intermediate member (26) having an upper portion pivotally connected to the upper member lower portion, and having a lower portion; and a lower member (29) having a lower portion pivotally mounted on the support, and having an upper portion; and wherein the intermediate member lower portion is movably mounted on the lower member upper portion such that pivotal movement of the upper member upper portion relative to the support will produce pivotal movement of the intermediate and lower members relative to the support; and a resilient member (31) arranged to bias the direction of relative movement between the intermediate and lower members.

Abstract: This invention provides an improvement in a control stick (e.g., joystick, side-stick, etc.) (20) adapted to control the movement of an object (e.g., an airfoil surface). The improvement includes: a support (21); an intermediately-pivoted upper member (23) mounted on the support, the upper member having an upper portion (24), and lower portion (25); an intermediate member (26) having an upper portion pivotally connected to the upper member lower portion, and having a lower portion; and a lower member (29) having a lower portion pivotally mounted on the support, and having an upper portion; and wherein the intermediate member lower portion is movably mounted on the lower member such that pivotal movement of the upper member upper portion relative to the support will produce pivotal movement of the intermediate and lower members relative to the support; and a resilient member (31) arranged to bias the direction of relative movement between the intermediate and lower members.

Abstract: This invention provides an improvement in a control stick (e.g., joystick, side-stick, etc.) (20) adapted to control the movement of an object (e.g., an airfoil surface). The improvement includes: a support (21); an intermediately-pivoted upper member (23) mounted on the support, the upper member having an upper portion (24), and lower portion (25); an intermediate member (26) having an upper portion pivotally connected to the upper member lower portion, and having a lower portion; and a lower member (29) having a lower portion pivotally mounted on the support, and having an upper portion; and wherein the intermediate member lower portion is movably mounted on the lower member such that pivotal movement of the upper member upper portion relative to the support will produce pivotal movement of the intermediate and lower members relative to the support; and a resilient member (31) arranged to bias the direction of relative movement between the intermediate and lower members.

Abstract: This invention provides an improvement in a control stick (e.g., joystick, side-stick, etc.) (20) adapted to control the movement of an object (e.g., an airfoil surface). The improvement includes: a support (21); an intermediately-pivoted upper member (23) mounted on the support, the upper member having an upper portion (24), and lower portion (25); an intermediate member (26) having an upper portion pivotally connected to the upper member lower portion, and having a lower portion; and a lower member (29) having a lower portion pivotally mounted on the support, and having an upper portion; and wherein the intermediate member lower portion is movably mounted on the lower member upper portion such that pivotal movement of the upper member upper portion relative to the support will produce pivotal movement of the intermediate and lower members relative to the support; and a resilient member (31) arranged to bias the direction of relative movement between the intermediate and lower members.

Abstract: This invention provides an improvement in a control stick (e.g., joystick, side-stick, etc.) (20) adapted to control the movement of an object (e.g., an airfoil surface). The improvement includes: a support (21); an intermediately-pivoted upper member (23) mounted on the support, the upper member having an upper portion (24), and lower portion (25); an intermediate member (26) having an upper portion pivotally connected to the upper member lower portion, and having a lower portion; and a lower member (29) having a lower portion pivotally mounted on the support, and having an upper portion; and wherein the intermediate member lower portion is movably mounted on the lower member upper portion such that pivotal movement of the upper member upper portion relative to the support will produce pivotal movement of the intermediate and lower members relative to the support; and a resilient member (31) arranged to bias the direction of relative movement between the intermediate and lower members.

Abstract: This invention provides an improvement in a control stick (e.g., joystick, side-stick, etc.) (20) adapted to control the movement of an object (e.g., an airfoil surface). The improvement includes: a support (21); an intermediately-pivoted upper member (23) mounted on the support, the upper member having an upper portion (24), and lower portion (25); an intermediate member (26) having an upper portion pivotally connected to the upper member lower portion, and having a lower portion; and a lower member (29) having a lower portion pivotally mounted on the support, and having an upper portion; and wherein the intermediate member lower portion is movably mounted on the lower member upper portion such that pivotal movement of the upper member upper portion relative to the support will produce pivotal movement of the intermediate and lower members relative to the support; and a resilient member (31) arranged to bias the direction of relative movement between the intermediate and lower members.

Abstract: This invention provides an improvement in a control stick (e.g., joystick, side-stick, etc.) (20) adapted to control the movement of an object (e.g., an airfoil surface). The improvement includes: a support (21); an intermediately-pivoted upper member (23) mounted on the support, the upper member having an upper portion (24), and lower portion (25); an intermediate member (26) having an upper portion pivotally connected to the upper member lower portion, and having a lower portion; and a lower member (29) having a lower portion pivotally mounted on the support, and having an upper portion; and wherein the intermediate member lower portion is movably mounted on the lower member upper portion such that pivotal movement of the upper member upper portion relative to the support will produce pivotal movement of the intermediate and lower members relative to the support; and a resilient member (31) arranged to bias the direction of relative movement between the intermediate and lower members.

Abstract: This invention provides an improvement in a control stick (e.g., joystick, side-stick, etc.) (20) adapted to control the movement of an object (e.g., an airfoil surface). The improvement includes: a support (21); an intermediately-pivoted upper member (23) mounted on the support, the upper member having an upper portion (24), and lower portion (25); an intermediate member (26) having an upper portion pivotally connected to the upper member lower portion, and having a lower portion; and a lower member (29) having a lower portion pivotally mounted on the support, and having an upper portion; and wherein the intermediate member lower portion is movably mounted on the lower member upper portion such that pivotal movement of the upper member upper portion relative to the support will produce pivotal movement of the intermediate and lower members relative to the support; and a resilient member (31) arranged to bias the direction of relative movement between the intermediate and lower members.

Abstract: A tandem electrohydrostatic actuator (70) broadly includes a first piston (22) operatively arranged in a first cylinder (23), and a second piston (24) operatively arranged in a second cylinder (25). The pistons are coupled to move together. The first piston has a small extend area (35) and a large retract area (36). The second piston has a large extend area (38) and a small retract area (39). The large areas (36, 38) of the pistons are equal to one another and the small areas (35, 39) of the pistons are equal to one another. A reversible fixed-displacement first pump (45) has equal inlet and outlet flows supplied to the small areas of the first and second pistons, respectively. A reversible fixed-displacement second pump (40) has equal inlet and outlet flows supplied to the large areas of the first and second pistons, respectively. The total volume of the fluid in the actuator remains constant at all positions of the pistons.

Abstract: A tandem electrohydrostatic actuator (70) broadly includes a first piston (22) operatively arranged in a first cylinder (23), and a second piston (24) operatively arranged in a second cylinder (25). The pistons are coupled to move together. The first piston has a small extend area (35) and a large retract area (36). The second piston has a large extend area (38) and a small retract area (39). The large areas (36, 38) of the pistons are equal to one another and the small areas (35, 39) of the pistons are equal to one another. A reversible fixed-displacement first pump (45) has equal inlet and outlet flows supplied to the small areas of the first and second pistons, respectively. A reversible fixed-displacement second pump (40) has equal inlet and outlet flows supplied to the large areas of the first and second pistons, respectively. The total volume of the fluid in the actuator remains constant at all positions of the pistons.