US3563499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanism to transfer engine torque and control motion across helicopter rotor vibration isolator
Assignee: United States Department of the Navy
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Filing: 1969-01-15
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Granted: 1971-02-16
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Expires: 1989-01-15
Abstract
Abstract A helicopter rotor is attached to a structural member which is in turn mounted on an airframe by vibration isolators which enable the rotor and structural member to vibrate in a vertical plane and do not transmit these vibrations to the airframe. A linkage system having one bell crank pivoted on the structural member and another bell crank pivoted on the airframe is used to transfer control motion to the helicopter rotor with a minimum of interference from the vibration of the rotor and structural member. Universal joints are used to transfer engine torque from the engine mounted on the airframe to the vibrating rotor.
Inventors
- 👤 James E Dueweke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:00
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/001; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A system for transmitting motion from a relatively stationary body to a body vibrating primarily in one direction while minimizing the effects of the relative vibration on the motion transmitted, the direction of motion transmitted being in the direction of vibration, said system comprising: a first rod; a first bell crank pivoted to said relatively stationary body, said first rod having one end pivoted to one end of said first bell crank; a second rod having one end pivoted to the other end of said first bell crank; a second bell crank pivoted to said vibrating body, said second rod having its other end pivoted to one end of said second bell crank; and a third rod pivoted to the other end of said second bell crank and extending in a direction generally perpendicular to said second rod, the direction of said third rod extension further being the direction of primary vibratory movement of said vibrating body, whereby longitudinal motion imparted to said first rod is transmitted to said third rod with minimum effect from the vibration of said vibrating body.
Claim 2
Independent Claim
181 words
A system for transmitting motion from a relatively stationary body to a body vibrating primarily in one direction while minimizing the effects of the relative vibration on the motion transmitted, the direction of motion transmitted being in the direction of vibration, said system comprising: a first rod; a first bell crank pivoted to said relatively stationary body, said first rod having one end pivoted to one end of said first bell crank; a second rod having one end pivoted to the other end of said first bell crank; a second bell crank pivoted to said vibrating body, said second rod having its other end pivoted to one end of said second bell crank; and a third rod pivoted to the other end of said second bell crank and extending in a direction generally perpendicular to said second rod, the direction of said third rod extension further being the direction of primary vibratory movement of said vibrating body, whereby longitudinal motion imparted to said first rod is transmitted to said third rod with minimum effect from the vibration of said vibrating body.
Claim 3
Dependent Claim
41 words
The system of claim 1 wherein the other end of said first rod is connected to a helicopter control member and the other end of said third rod is connected to means for varying the pitch of a helicopter rotor blade.
Claim 4
Dependent Claim
144 words
In a helicopter, the combination comprising: a helicopter airframe; a rotor assembly including adjustable pitch rotor blades; vibration isolating means for isolating vibrations Of said rotor assembly so that they are not transmitted to said airframe; a control member for transmitting motions from said airframe to said rotor blades; means responsive to said control member for varying the pitch of said rotor blades; a first rod connected to and moveable lengthwise by said control member; a second rod extending in the direction of primary vibratory rotor motion and connected to said pitch varying means for actuation thereof by lengthwise movement of said second rod; and a third rod perpendicular to said second rod and connected to said first and second rods by first and second bellcranks, respectively, said first bellcrank being pivoted to said body and second bell crank to said isolated rotor assembly.
Claim 5
Dependent Claim
144 words
In a helicopter, the combination comprising: a helicopter airframe; a rotor assembly including adjustable pitch rotor blades; vibration isolating means for isolating vibrations Of said rotor assembly so that they are not transmitted to said airframe; a control member for transmitting motions from said airframe to said rotor blades; means responsive to said control member for varying the pitch of said rotor blades; a first rod connected to and moveable lengthwise by said control member; a second rod extending in the direction of primary vibratory rotor motion and connected to said pitch varying means for actuation thereof by lengthwise movement of said second rod; and a third rod perpendicular to said second rod and connected to said first and second rods by first and second bellcranks, respectively, said first bellcrank being pivoted to said body and second bell crank to said isolated rotor assembly.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |