US3920202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension system for rotocraft rotors
Assignee: Airbus Group SAS
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Filing: 1974-04-25
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Granted: 1975-11-18
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Expires: 1994-04-25
Abstract
Abstract The vibration created by torque of a rotor of a helicopter and the like is dampened by fastening a baseplate having a pair of diametrically opposed shoulders to the housing of the transmission box whereto the rotor mast is mounted. Relatively to the fuselage of the helicopter, projections are fixed which are independent of the baseplate and extend in opposition to the shoulders to cooperate therewith for limiting the rotary movement of the baseplate. Between the shoulders and the projections, resilient members are interposed to absorb the compressive force of the rotary movement.
Inventors
- 👤 Rene Louis Mouille
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:17
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/001; B64C2027/002; B64C2027/005; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A system for suspending on the fUselage of a rotorcraft the transmission housing of the rotor, said transmission housing being subject to movement about a central axis and in directions radial to the central axis, comprising a baseplate fastened to the bottom of the transmission housing to move conjointly therewith, said baseplate having a pair of diametrically opposed radially extending shoulders, means independent of said baseplate fixed relatively to the fuselage having radial projections extending in opposition to said shoulders to form an abutment therefor to limit the movement of said baseplate, and resilient means interposed between each of said shoulders and said projections to absorb the force of said movement.
Claim 2
Independent Claim
111 words
A system for suspending on the fUselage of a rotorcraft the transmission housing of the rotor, said transmission housing being subject to movement about a central axis and in directions radial to the central axis, comprising a baseplate fastened to the bottom of the transmission housing to move conjointly therewith, said baseplate having a pair of diametrically opposed radially extending shoulders, means independent of said baseplate fixed relatively to the fuselage having radial projections extending in opposition to said shoulders to form an abutment therefor to limit the movement of said baseplate, and resilient means interposed between each of said shoulders and said projections to absorb the force of said movement.
Claim 3
Dependent Claim
18 words
The system according to claim 1, wherein said baseplate comprises a ring formed of a light metal alloy.
Claim 4
Dependent Claim
21 words
The system according to claim 1, wherein said resilient means is secured to one of each of said shoulders and projections.
Claim 5
Dependent Claim
32 words
The system according to claim 1, wherein said resilient means comprise an assembly of alternating metal plates and elastic sheets arranged so as to be relatively shiftable with respect to each other.
Claim 6
Dependent Claim
105 words
The system according to claim 1, including a rigid ring surrounding said baseplate and being coplanar therewith, said rigid ring having a first pair of diametrically opposed extensions and a second pair of diametrically opposed extensions offset by 90* from said first pair of extensions, each of the first pair of extensions being opposed to one of the shoulders of said baseplate to coact therewith, and each of said second pair of extensions being opposed to one of said projections fixed relatively to said fuselage to coact therewith, and including resilient means interposed respectively between each of said extensions and the associated shoulders and projections.
Claim 7
Dependent Claim
46 words
The system according to claim 5, in which said rigid ring comprises two parallel substantially planar and identical annular members having said baseplate positioned therebetween, said extensions being raised between and affixed to said parallel annular members to form therebetween spacers maintaining same in parallel relationship.
Claim 8
Dependent Claim
13 words
The suspension system according to claim 1 wherein the rotorcraft is a helicopter.
Claim 9
Dependent Claim
13 words
The suspension system according to claim 2 wherein the rotorcraft is a helicopter.
Claim 10
Dependent Claim
13 words
The suspension system according to claim 3 wherein the rotorcraft is a helicopter.
References Cited (Backward Citations)
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |