Patent US1407850A successfully refreshed from Google Patents.
US3841586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor swashplate assembly
Assignee: Boeing Co
•
Filing: 1973-04-26
•
Granted: 1974-10-15
•
Expires: 1993-04-26
Abstract
Abstract A rotor swashplate assembly wherein the inner rotating ring of the swashplate is connected to the rotating rotor shaft by four scissor links arranged in two pairs such that each pair is 90* to the other. Each of the links of one pair of scissor links is connected to the rotating rotor shaft through the use of an elastomeric bearing. The elastomeric bearing permits the scissor links to angularly deflect in the plane of rotation with respect to the rotor shaft thereby permitting the swashplate to tilt. The scissor link connection transmits torque to the rotating ring of the swashplate from the rotor shaft, centers it about the rotor shaft, and allows it to tilt and move vertically as required for control actuation.
Inventors
- 👤 W Broadley
- 👤 K Grina
- 👤 C Schaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:12
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54; B64C27/58; B64C27/59; B64C27/605; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296; Y10T74/18336; Y10T74/20; Y10T74/20207
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
185 words
In a rotorcraft having a rotatable rotor assembly including a rotor connected to a rotorshaft; a control system including a non-rotating portion connected to the aircraft and a rotating portion connected to the rotor assembly; and a swashplate assembly interface between the rotating and non-rotating portions of the control system which conprises: a swashplate including a rotatable ring, a non-rotatable ring and means to permit rotation connected to said rotatable ring and to said non-rotatable ring; a first pair of opposed scissor links, one end of each link being operably connected to said rotating ring, the other end of each link being operably connected to the rotor assembly; a second pair of opposed scissor links, one end of each link being operably connected to said rotating ring so that each link is displaced approximately 90* from each of the links of said first pair of scissor links, the other end of each link of said second pair of scissor links being operably connected to the rotor assembly means permitting said links to angularly deflect with respect to the rotor assembly in the plane of rotation.
Claim 2
Dependent Claim
185 words
In a rotorcraft having a rotatable rotor assembly including a rotor connected to a rotorshaft; a control system including a non-rotating portion connected to the aircraft and a rotating portion connected to the rotor assembly; and a swashplate assembly interface between the rotating and non-rotating portions of the control system which conprises: a swashplate including a rotatable ring, a non-rotatable ring and means to permit rotation connected to said rotatable ring and to said non-rotatable ring; a first pair of opposed scissor links, one end of each link being operably connected to said rotating ring, the other end of each link being operably connected to the rotor assembly; a second pair of opposed scissor links, one end of each link being operably connected to said rotating ring so that each link is displaced approximately 90* from each of the links of said first pair of scissor links, the other end of each link of said second pair of scissor links being operably connected to the rotor assembly means permitting said links to angularly deflect with respect to the rotor assembly in the plane of rotation.
Claim 3
Dependent Claim
40 words
The swashplate assembly of claim 1 wherein each of the links of said second pair of scissor links is operably connected to said rotor assembly by a resilient means, and wherein said resilient means is connected to said rotor assembly.
Claim 4
Dependent Claim
55 words
The swashplate assembly of claim 2 wherein each of the resilient means is an elastomeric bearing having an inner race and an outer race, one end of each link of said second pair of scissor links is operably connected to said outer race and wherein each of said inner races is connected to the rotor.
Claim 5
Dependent Claim
43 words
The swashplate assembly of claim 3 wherein each of the links of said first pair of scissor links is connected to the rotorshaft of the rotor assembly, and wherein each of said inner races is connected to the rotorshaft of the rotor assembly.
Claim 6
Dependent Claim
28 words
The swashplate assembly of claim 4 wherein each link of said first and second pairs of scissor links is connected to said rotating ring by a universal joint.
Claim 7
Dependent Claim
17 words
The swashplate assembly of claim 5 wherein said nonrotating ring is concentrically mounted about said rotating ring.
Claim 8
Dependent Claim
47 words
The swashplate assembly of claim 3 wherein the operable connection of each of said links of said first pair of scissor links to the rotorshaft is a pivotal connection to permit said links to rotate in a plane perpendicular to the plane of rotation of the rotorshaft.
Claim 9
Dependent Claim
88 words
The swashplate assembly of claim 1 having first and second elastomeric bearings each bearing having an inner race and an outer race wherein one end of each link of said second pair of scissor links is operably connected to said outer race of said first eLastomeric bearing and to said outer race of said second elastomeric bearing, and wherein each of said inner races is rigidly connected to the rotorshaft, and wherein each link of said first pair of scissor links is operably connected to an inner race.
Claim 10
Dependent Claim
86 words
The swashplate of claim 8 wherein the operable connection of each link of said first pair of scissor links to said inner face is a pivotal connection to permit said links to rotate in a plane perpendicular to the plane of rotation of the rotorshaft and wherein the operable connection of each link of said second pair of scissor links to said outer race is a pivotal connection to permit said links to rotate in a plane perpendicular to the plane of rotation of the rotorshaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |