The mechanism includes a primary load path element having at least one slot. A pin-key within the primary load path element slot allows freedom of movement in a rotational direction orthogonal to a positioning direction. A secondary load path element includes at least one secondary load path element
The mechanism includes a primary load path element having at least one slot. A pin-key within the primary load path element slot allows freedom of movement in a rotational direction orthogonal to a positioning direction. A secondary load path element includes at least one secondary load path element slot. A key is positioned between the load path elements. A compression cam is positioned within an opening in the secondary load path element that defines a grooved cam seat. A tension cam is positioned within the opening in the secondary load path element. The tension cam has a defined pivot and stop. A cam follower rests on lobe surfaces of the cams. The cam follower applies a preload force to both cams opposing the cam's rotation. A push rod is seated in a hole in the cam follower and extends through a respective hole in the secondary load path element.
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1. A centering, release and reset mechanism, comprising: a) a primary load path element operatively connected to a positioning structure, said primary load path element having at least one primary load path element slot;b) a pin-key positioned within said primary load path element slot arranged and
1. A centering, release and reset mechanism, comprising: a) a primary load path element operatively connected to a positioning structure, said primary load path element having at least one primary load path element slot;b) a pin-key positioned within said primary load path element slot arranged and constructed to allow freedom of movement in a rotational direction orthogonal to a positioning direction;c) a secondary load path element including at least one secondary load path element slot, a key or spline being positioned between said secondary load path element and said primary load path element;d) a compression cam positioned within an opening in said secondary load path element, said opening defining a grooved cam seat for permitting said compression cam to have a defined pivot and stop;e) a tension cam positioned within said opening in said secondary load path element, rotation of said tension cam being permitted in the same rotary direction as said compression cam, said tension cam having a defined pivot and stop;f) a cam follower resting on respective lobe surfaces of said compression cam and said tension cam, said cam follower having a preload force against rotation against either cam;g) a push rod seated in a hole in said cam follower and extending through a respective hole in said secondary load path element;h) a leaf spring assembly, comprising: i) a spring carrier piloted on an end of said secondary load path element; and,ii) a plurality of leaf springs carried by said spring carrier and fastened to said secondary load path element, said leaf springs providing said preload force; wherein: in a desired, loaded, centered position a preload force from said cam follower is received by said stops on said compression cam and said tension cam, said pin-key being thereby captured and centered in said secondary load path element relative to said primary load path element's slot;a failure in a primary load path causes a load to be impressed between said pin-key and one of said cams and if said load is sufficiently high enough to overcome said preload force of said cam follower, then said cam will rotate allowing said pin-key to move in either the tension or compression direction;when said primary load path element and said secondary load path element are repositioned back to said centered position, then said cam follower rotates said cam back to its centered reset positions; and,said release and reset actions do not require the use of a shear pin. 2. The centering, release and reset mechanism of claim 1, wherein said primary load path element comprises a primary ball nut operatively connected to a primary gimbal positioning a horizontal stabilizer wing or other control structure of an aircraft. 3. The centering, release and reset mechanism of claim 1 wherein said secondary load path element comprises a secondary nut housing of an aircraft control element, said secondary nut housing being positioned such that inverted threads of a secondary inverted nut contained therein are positioned within a space of a ball screw thread of a ball screw, without touching flanks of said ball screw thread, under normal loading conditions while a primary load path of an actuator operatively connected to said ball screw is intact (not failed); and, wherein upon the release of said mechanism, due to any tension or compression loading that overcomes said preload force, the release and resulting axial movement initiating loading of said secondary inverted nut causes actuator lockup and primary load path failure detection by the aircraft's electronics. 4. The centering, release and reset mechanism of claim 1, wherein said freedom of movement of said pin-key in said rotational direction allows for a backlash of a rotational key or spline located between said primary load path element and said secondary load path element. 5. The centering, release and reset mechanism of claim 1, wherein said pin-key, said compression cam, said tension cam, said cam follower, said push rod; and, said leaf spring assembly comprise a first set of functional elements, wherein said centering, release and reset mechanism further includes a second set of said functional elements positioned 180 degrees apart from said first set, around the axis of said positioning structure. 6. The centering, release and reset mechanism of claim 1, wherein said tension cam and said compression cam are balanced with the same preload force by providing the same distance from each said lobe surface to the cam's center of rotation for both tension and compression cams. 7. A centering, release and reset mechanism for utilization with a horizontal stabilizer wing of an aircraft, comprising: a) a primary load path element comprising a primary ball nut operatively connected to a primary gimbal positioning a horizontal stabilizer wing operatively connected to a positioning structure, said primary load path element having at least one primary load path element slot;b) a pin-key positioned within said primary load path element slot arranged and constructed to allow freedom of movement in a rotational direction orthogonal to a positioning direction;c) a secondary load path element comprising a secondary nut housing, including at least one secondary load path element slot, a key or spline being positioned between said secondary load path element and said primary load path element;d) a compression cam positioned within an opening in said secondary load path element, said opening defining a grooved cam seat for permitting said compression cam to have a defined pivot and stop;e) a tension cam positioned within said opening in said secondary load path element, rotation of said tension cam being permitted in the same rotary direction of said compression cam, said tension cam having a defined pivot and stop;f) a cam follower resting on respective lobe surfaces of said compression cam and said tension cam, said cam follower having a preload force against rotation against either cam;g) a push rod seated in a hole in said cam follower and extending through a respective hole in said secondary load path element; and,h) a leaf spring assembly, comprising: i) a spring carrier piloted on an end of said secondary load path element; and,ii) a plurality of leaf springs carried by said spring carrier and fastened to said secondary load path element, said leaf springs providing said preload force; wherein: in a desired, loaded, centered position a preload force from said cam follower is received by said stops on said compression cam and said tension cam, said pin-key being thereby captured and centered in said secondary load path element relative to said primary load path element's slot;a failure in a primary load path causes a load to be impressed between said pin-key and one of said cams and if said load is sufficiently high enough to overcome said preload force of said cam follower, then said cam will rotate allowing said pin-key to move in either the tension or compression direction;when said primary load path element and said secondary load path element are repositioned back to said centered position, then said cam follower rotates said cam back to its centered reset positions; and,said release and reset actions do not require the use of a shear pin, and wherein a. said secondary nut housing is positioned such that inverted threads of a secondary inverted nut contained therein are positioned within a space of a ball screw thread of a ball screw, without touching flanks of said ball screw thread, under normal loading conditions while a primary load path of an actuator operatively connected to said ball screw is intact (not failed); and,b. wherein upon the release of said mechanism, due to any tension or compression loading that overcomes said preload force, the release and resulting axial movement initiating loading of said secondary inverted nut causes actuator lockup and primary load path failure detection by the aircraft's electronics. 8. The centering, release and reset mechanism of claim 7, wherein said freedom of movement of said pin-key in said rotational direction allows for a backlash of a rotational key or spline located between said primary load path element and said secondary load path element. 9. The centering, release and reset mechanism of claim 7, wherein said pin-key, said compression cam, said tension cam, said cam follower, said push rod, and, said leaf spring assembly comprise a first set of functional elements, wherein said centering, release and reset mechanism further includes a second set of said functional elements positioned 180 degrees apart from said first set, around the axis of said positioning structure. 10. The centering, release and reset mechanism of claim 7, wherein said tension cam and said compression cam are balanced with the same preload force by providing the same distance from each said lobe surface to the cam's center of rotation for both tension and compression cams. 11. A centering, release and reset mechanism, comprising: a) a primary load path element operatively connected to a positioning structure, said primary load path element having at least one primary load path element slot;b) a pin-key positioned within said primary load path element slot arranged and constructed to allow freedom of movement in a rotational direction orthogonal to a positioning direction;c) a secondary load path element including at least one secondary load path element slot;d) a compression cam positioned within an opening in said secondary load path element, said opening defining a grooved cam seat for permitting said compression cam to have a defined pivot and stop;e) a tension cam positioned within said opening in said secondary load path element, rotation of said tension cam being permitted in the same rotary direction as said compression cam, said tension cam having a defined pivot and stop;f) a cam follower resting on respective lobe surfaces of said compression cam and said tension cam, said cam follower having a preload force against rotation against either cam;g) a spring assembly piloted on an end of said secondary load path element providing said preload force; wherein: in a desired, loaded, centered position a preload force from said cam follower is received by said stops on said compression cam and said tension cam, said pin-key being thereby captured and centered in said secondary load path element relative to said primary load path element's slot;a failure in a primary load path causes a load to be impressed between said pin-key and one of said cams and if said load is sufficiently high enough to overcome said preload force of said cam follower, then said cam will rotate allowing said pin-key to move in either the tension or compression direction;when said primary load path element and said secondary load path element are repositioned back to said centered position, then said cam follower rotates said cam back to its centered reset positions; and,said release and reset actions do not require the use of a shear pin. 12. The centering, release and reset mechanism of claim 11, wherein said primary load path element comprises a primary ball nut operatively connected to a primary gimbal positioning a horizontal stabilizer wing or other control structure of an aircraft. 13. The centering, release and reset mechanism of claim 11 wherein said secondary load path element comprises a secondary nut housing of an aircraft control element, said secondary nut housing being positioned such that inverted threads of a secondary inverted nut contained therein are positioned within a space of a ball screw thread of a ball screw, without touching flanks of said ball screw thread, under normal loading conditions while a primary load path of an actuator operatively connected to said ball screw is intact (not failed); and, wherein upon the release of said mechanism, due to any tension or compression loading that overcomes said preload force, the release and resulting axial movement initiating loading of said secondary inverted nut causes actuator lockup and primary load path failure detection by the aircraft's electronics. 14. The centering, release and reset mechanism of claim 11, wherein said freedom of movement of said pin-key in said rotational direction allows for a backlash of a rotational key or spline located between said primary load path element and said secondary load path element. 15. The centering, release and reset mechanism of claim 11, wherein said tension cam and said compression cam are balanced with the same preload force by providing the same distance from each said lobe surface to the cam's center of rotation for both tension and compression cams.
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이 특허에 인용된 특허 (14)
Shaheen, Milad A.; Dreher, Robert V., Actuator for aircraft stabilizers with a failure responsive lock control mechanism.
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Kister Horst (Wehrheim DEX) Schwab Jean-Francois (Schmitten DEX) Quenzer Michael (Frankfurt am Main DEX) Schult Klaus (Frankfurt am Main DEX) Patzig Hans-Norbert (Bad Homburg DEX), Holding device for mounting an electric transducer.
Nelson Harold K. (Seattle WA) Kleingartner Charles A. (Bothell WA) Vetsch LeRoy E. (Bothell WA), Strain/deflection sensitive variable reluctance transducer assembly.
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