Helicopter collective stick of the displacement type occupying a minimum space envelope yet whose grip generates an arc of large radius
First Claim
1. A helicopter collective pitch control stick of the displacement type which occupies a minimum space envelope and whose pilot grip motion generates a large radius arc comprising:
- a. a pilot grip member;
b. a linkage assembly connected to and operable by the pilot grip member and comprising;
1) a first link having first and second ends, and with its first end pivotally connected to a fixed station;
2) a second link having first and second ends, and with its second end integrally connected to the pilot grip member;
3) a third link having first and second ends, and having its first end pivotally connected to the first end of the second link and its second end pivotally connected to the first link at a selected station between the first link'"'"'s first and second ends; and
4) a fourth link extending substantially parallel to the third link and having first and second ends and having its first end pivotally connected to the second link at a selected station between the first and second ends of the second link, and having its second end pivotally connected to the second end of the first link;
said links being of selected length and the pivot connections between said links being selectively positioned so that the pilot grip member and the link assembly occupy a small space envelope and so that the motion of the pilot grip member generates an arc of large radius;
c. a positioning means connected to said linkage assembly and operable to cause motion of the linkage assembly to selectively position the pilot grip member.
1 Assignment
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Accused Products
Abstract
A helicopter collective control stick having a pilot grip positioned by a linkage assembly whose kinematics permits the control stick to occupy a small envelope and to have the pilot grip motion to be about a large radius. Our collective stick includes a biasing member to balance the control stick and linkage in the mid collective position and which provides a force gradient when the control stick is moved from the mid collective or trimmed position. Further, our collective stick is operable in concert with the full authority side arm controller to operate in either a tracking or a command mode.
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Citations
18 Claims
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1. A helicopter collective pitch control stick of the displacement type which occupies a minimum space envelope and whose pilot grip motion generates a large radius arc comprising:
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a. a pilot grip member; b. a linkage assembly connected to and operable by the pilot grip member and comprising; 1) a first link having first and second ends, and with its first end pivotally connected to a fixed station; 2) a second link having first and second ends, and with its second end integrally connected to the pilot grip member; 3) a third link having first and second ends, and having its first end pivotally connected to the first end of the second link and its second end pivotally connected to the first link at a selected station between the first link'"'"'s first and second ends; and 4) a fourth link extending substantially parallel to the third link and having first and second ends and having its first end pivotally connected to the second link at a selected station between the first and second ends of the second link, and having its second end pivotally connected to the second end of the first link; said links being of selected length and the pivot connections between said links being selectively positioned so that the pilot grip member and the link assembly occupy a small space envelope and so that the motion of the pilot grip member generates an arc of large radius; c. a positioning means connected to said linkage assembly and operable to cause motion of the linkage assembly to selectively position the pilot grip member. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11, 12)
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5. A helicopter control stick according to claim wherein the positioning means is an input crank, and including mechanical means for positioning said input crank to control said collective pitch control stick position, or to provide a signal of collective pitch control stick position.
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13. An operator control stick of the displacement type which occupies a minimum space envelope and whose grip motion generates a large radius arc comprising:
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a. an operator grip member; and b. a linkage assembly connected to and operable by the grip member and comprising; 1) a first link having first and second ends, and with its first end pivotally connected to a fixed station; 2) a second link having first and second ends, and with its second end integrally connected to the grip member; 3) a third link having first and second ends, and having its first end pivotally connected to the first end of the second link and its second end pivotally connected to the first link at a selected station between the first link'"'"'s first and second ends; and 4) a fourth link extending substantially parallel to the third link and having first and second ends and having its first end pivotally connected to the second link at a selected station between the first and second ends of the second link, and having its second end pivotally connected to the second end of the first link; said links being of selected length and the pivot connections between said links being selectively positioned so that the grip member and the link assembly occupy a small space envelope and so that the motion of the grip member generates an arc of large radius. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification