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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0803978 (1991-12-09) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 35 인용 특허 : 0 |
A door closing piston-cylinder assembly which is designed to permit the door initially to move to closed position relatively rapidly but with controlled restraint until it approaches the fully closed position whereupon the door continues to move but considerably more slowly so that it will close smo
A door closing piston-cylinder assembly comprising an elongated air cylinder having first and second ends, said cylinder having a first bore adjacent said first end of said cylinder, said cylinder having a second bore of smaller diameter than said first bore adjacent said second end of said cylinder
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