Reusable rotorcraft bumper, and a rotorcraft having such a bumper
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B64C-007/00
출원번호
US-0859330
(2010-08-19)
등록번호
US-8434718
(2013-05-07)
우선권정보
FR-09 04148 (2009-09-02)
발명자
/ 주소
Mairou, Joseph
Prud'Homme-Lacroix, Pierre
출원인 / 주소
Eurocopter
대리인 / 주소
Brooks Kushman P.C.
인용정보
피인용 횟수 :
0인용 특허 :
12
초록▼
A reusable bumper (10) for a rotorcraft (1) suitable for protecting a rear end (3) of said rotorcraft (1). The bumper (10) comprises a resilient outer shell (20) forming a first chamber (11) having a resilient inner shell (30) placed therein and forming a second chamber (12), said outer shell (20) h
A reusable bumper (10) for a rotorcraft (1) suitable for protecting a rear end (3) of said rotorcraft (1). The bumper (10) comprises a resilient outer shell (20) forming a first chamber (11) having a resilient inner shell (30) placed therein and forming a second chamber (12), said outer shell (20) having at least one main orifice (21), said inner shell (30) being provided with management means (50) for managing the pressure that exists inside said second chamber (12) and suitable for enabling said pressure to increase up to a predetermined threshold in order to inform the pilot that the bumper (10) has made contact with the ground (S), and then to enable said pressure to drop in order to absorb energy resulting from said contact.
대표청구항▼
1. A reusable bumper for a rotorcraft suitable for protecting a rear end of the rotorcraft, wherein the bumper comprises a resilient outer shell having a contact wall forming a first chamber having a resilient inner shell placed therein above the contact wall and forming a second chamber, the outer
1. A reusable bumper for a rotorcraft suitable for protecting a rear end of the rotorcraft, wherein the bumper comprises a resilient outer shell having a contact wall forming a first chamber having a resilient inner shell placed therein above the contact wall and forming a second chamber, the outer shell having at least one main orifice, the inner shell being provided with management means for managing the pressure that exists inside the second chamber and suitable for enabling the pressure to increase up to a predetermined threshold in order to inform the pilot that the bumper has made contact with the ground, and then to enable the pressure to drop in order to absorb energy resulting from the contact. 2. A bumper according to claim 1, wherein the outer shell is made of an elastomer material suitable for conserving its shape under the effect of air pressure in flight and for returning to its shape after making contact with the ground. 3. A bumper according to claim 1, wherein the inner shell is made of an elastomer material suitable for conserving its shape under the effect of air pressure in flight and for returning to its shape after making contact with the ground. 4. A bumper according to claim 1, wherein the management means comprise at least one secondary orifice connecting the second chamber to the outside of the bumper. 5. A bumper according to claim 1, wherein the management means comprise a pressure-relief valve. 6. A bumper according to claim 5, including a rigid outer plate to which an outer periphery of the outer shell is bonded, a top wall of the inner shell being bonded to an inner plate to which the pressure-relief valve is secured in order to close at least one slot in the inner plate, the inner plate being fastened to the outer plate so that the inner shell is arranged inside the outer shell, the pressure-relief valve passing through a main opening of the outer plate to open out to the outside of the bumper. 7. A bumper according to claim 5, wherein the valve cooperates with slots in fluid communication with the second chamber to keep the slots closed when the pressure within the second chamber is below a predetermined threshold and to open the slots when the pressure within the second chamber exceeds the predetermined threshold. 8. A bumper according to claim 1, wherein the contact wall of the outer shell is suitable for facing the ground when the bumper is fastened to the rear end, and a bottom wall of the inner shell is in contact with the contact wall. 9. A bumper according to claim 8, wherein the bottom wall of the inner shell is secured to the contact wall. 10. A bumper according to claim 1, wherein the inner shell comprises a bottom wall and a top wall connected together by a side wall, and the bumper is provided with a spring surrounding the side wall of the inner shell. 11. A bumper according to claim 10, wherein the side wall is in the form of a bellows and the bottom wall, the top wall and the bellows cooperate to form the second chamber. 12. A rotorcraft provided with a rotary lift wing located between a nose and a rear end of said rotorcraft, wherein a bottom face of said rear end facing the ground when the rotorcraft is standing on the ground is provided with a bumper comprising a resilient outer shell having a contract wall forming a first chamber having a resilient inner shell placed therein above the contact wall and forming a second chamber, said outer shell having at least one main orifice, said inner shell being provided with management means for managing the pressure that exists inside said second chamber and suitable for enabling said pressure to increase up to a predetermined threshold in order to inform the pilot that the bumper has made contact with the ground, and then to enable said pressure to drop in order to absorb energy resulting from said contact. 13. The rotorcraft of claim 12, wherein the management means comprises a pressure-release valve. 14. The rotorcraft of claim 13, wherein the valve cooperates with slots in fluid communication with the second chamber to keep the slots closed when the pressure within the second chamber is below a predetermined threshold and to open the slots when the pressure within the second chamber exceeds the predetermined threshold. 15. A reusable bumper disposed on the underside of the rear end of a rotorcraft fuselage for protecting the rear end of the rotorcraft, the bumper comprising: a resilient outer shell secured to the rear end of the fuselage and the outer shell having a contact wall cooperating with the fuselage to form a first chamber, the outer shell having at least one main orifice in fluid communication with the environment;a resilient inner shell disposed within the first chamber above the contact wall and forming a second chamber; anda management means located on the inner shell for managing the pressure that exists inside the second chamber and for enabling the pressure to increase in the second chamber up to a predetermined threshold to thereby inform the pilot that the bumper has made contact with the ground, and then to enable said pressure to drop in order to absorb energy resulting from said contact. 16. The bumper of claim 15, wherein the management means comprises a pressure-release valve. 17. The bumper of claim 16, wherein the valve cooperates with slots in fluid communication with the second chamber to keep the slots closed when the pressure within the second chamber is below a predetermined threshold and to open the slots when the pressure within the second chamber exceeds the predetermined threshold.
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