[특허]Retrofit hydraulic fluid leak detection system

[미국특허] Retrofit hydraulic fluid leak detection system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G08B-021/00
출원번호	US-0481910 (1995-06-07)
발명자 / 주소	Oliver Joseph J. (Lincoln NE) Young Christopher L. (Fargo ND) Bednar Richard D. (Lake Mills WI)
출원인 / 주소	Ransomes America Corporation (Lincoln NE 02)
인용정보	피인용 횟수 : 12 인용 특허 : 28

초록 ▼

Provided is a self-calibrating system which self-calibrates for operation regardless of the particular reservoir or expansion tank, which further detects when a hydraulic fluid system adapted to a turf care machine has developed a leak and which warns the machine operator of such a leak before an appreciable amount of hydraulic fluid is allowed to leak from the system. The system includes a reservoir for holding a quantity of hydraulic fluid. The reservoir is connected via a connecting tube or hose located at the upper-most portion of the reservoir and connected to an expansion tank mounted substantially adjacent to the reservoir. The expansion tank includes a fitting having an elongated tube extending down into the expansion tank. The end of this tube is maintained substantially below the level of hydraulic fluid in the expansion tank during operation of the turf care machine to which it is attached. As the machine is operated, the hydraulic fluid expands with rising temperatures, and the connecting tube communicates the expanding fluid to the expansion tank. When operation of the machine is discontinued the hydraulic fluid contracts as it cools. As the hydraulic fluid contracts, the hydraulic fluid in the expansion tank is automatically drawn by a siphoning action through the elongated tube within the expansion tank through the connecting tube and back into the reservoir. The self-calibrating leak detection system is adaptable to a variety of self propelled machines having hydraulically actuated devices. In particular, significant savings could be gained by the early detection of hydraulic system leaks on large, earth-moving equipment and the like. Further, the self-calibrating hydraulic fluid leak detection system may be retrofit onto existing hydraulic systems by the addition of an expansion tank to the hydraulic system reservoir.

대표청구항 ▼

A hydraulic fluid leak detection system for a self-propelled vehicle or self-propelled machine including a hydraulic system having a hydraulically actuated device and a reservoir of hydraulic fluid, the leak detection system comprising: an expansion tank in fluid communication with the reservoir; a first sensor disposed within the expansion tank and operable for sensing the hydraulic fluid level in the expansion tank over a range of possible fluid levels in the expansion tank and for producing a first signal varying in accordance with the hydraulic fluid level; a second sensor operable for sensing the temperature level of the hydraulic fluid in the reservoir and for producing a second electronic signal corresponding thereto; electronic processing means for receiving the first and second signals and for determining from the first and second signals if a leak exists in the hydraulic system; and means for indicating to an operator that a leak exists in the hydraulic system.

이 특허에 인용된 특허 (28) 인용/피인용 타임라인 분석

Pedersen Carl O. (Burlington IA), Automatic hydraulic shut-off system.
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Lindh K. Gosta (Sollentuna SEX), Device for detecting leakage in hydraulic systems.
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Miller Marshall B. (4634 Northwood Ter. Sarasota FL 33580), Engine oil leak catch pan.
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Nakagawa Tadao (Ueda JA), Fluid level alarm device.
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Nakashima Katsushi (Kariya JA), Fluid level indicator.
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Farmer Edward J. (1611 20th St. Sacramento CA 95814), Fluid vessel leak existence system, method and apparatus.
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Wang Hsien B. (Newport Beach CA), Hydraulic circuit breaker.
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Oliver Joseph J. (Lincoln NE) Young Christopher L. (Fargo ND) Bednar Richard D. (Lake Mills WI), Hydraulic fluid leak detection system and method.
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Martinez Donald G. (P.O. Box 584 Calistoga CA 94515), Hydraulic fluid leak warning apparatus.
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Peacock Clifford T. (8 Cliff Lane Brierley ; Nr. Barnsley S72 9HR GB2), Leak detection of underground or otherwise inaccessible liquid storage tanks.
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Carlin John A. (Denver CO) Mobeck William L. (Denver CO) Boyd Dale H. (Aurora CO), Leak detector.
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Horner John A. (211 E. Grove St. Kawkawlin MI 48631), Leak detector.
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Kunze Hans-Jurgen (Bottrop-Kirchhellen DEX) Francuz Josip (Moers DEX), Leak monitor for hydraulic drive systems.
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Marchi Gary C. (Burlington IA) Logan Richard H. (West Burlington IA), Leak-detecting hydraulic system.
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Hurner Erwin E. (2605 S. Rivershore Moorhead MN 56560), Lubricating oil monitor.
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Hyfantis ; Jr. George J. (346 Fallen Oak Cir. Seymour TN 37865) Ellis Richard A. (1913 Red Fox La. Hixson TN 37343) McCulloch Reg W. (321 W. Heritage Dr. Farragut TN 37922), Method and apparatus for detecting leaks in a liquid-containing tank.
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Tolan Peter J. (30 Greenfield La. Scituate MA 02066), Method and apparatus for measuring the change in volume with change in temperature of liquid in tanks.
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Lagergren Peter J. (Arlington TX) Allen ; Jr. C. Cameron (Richardson TX), Method and apparatus for storage tank leak detection having temperature compensation.
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O'Brien ; John W., Method and device for detecting hydraulic leaks.
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Kurt, Lynn E., Method of checking for hydraulic leakage.
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Kobayashi Satoru (Hitaka JPX), Oil leak detector.
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Moorehead Robert M. (Richardson TX), Oil leakage detection apparatus.
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Hara Sachio (8-2-813 ; Toyooka 1-Chome Iruma-shi ; Saitama JPX), Oil leakage sensor.
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Ames Donald P. (914 Black Twig La. St. Louis MO 63122), Oil level monitor.
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Oliver Joseph J. (Lincoln NE) Young Christopher L. (Fargo ND) Bednar Richard D. (Lake Mills WI), Self-calibrating hydraulic fluid leak detection system.
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Hasselmann Detlev E. M. (519 S. Nardo Ave. Solana Beach CA 92075), System and method for automatically monitoring liquid volume changes in storage tanks.
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Peacock David J. H. (200-204 Bye Pass Road Chillwell ; Nottingham GBX NG9) Dorsett Michael D. (Nottingham GBX), Ultrasonic leak detection.
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Mastandrea John R. (Rancho Palos Verdes CA), Volumetric leak detection system for underground storage tanks and the like.
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이 특허를 인용한 특허 (12) 인용/피인용 타임라인 분석

Canfield, Eric L.; Cheslock, Edward P., Detecting unintended flush toilet water flow.
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Therriault, Ronald, Elevator alert for fluid overflow into elevator pit.
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Chajec, Zdzislaw W.; Nelson, Steven D.; Nelson, Eric A.; O'Brien, Kevin C., Fluid level measuring system for machines.
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Yu Xudong ; Schmidt Gregory A. ; Schultz Michael S., Hydraulic fluid reservoir.
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Vianna, Wlamir Olivares Loesch, Leakage detection and fluid level prognostics for aircraft hydraulic systems.
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Moss, Robert A., Phase separation detector for fuel storage tank.
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Canfield, Eric L.; Cheslock, Edward P., Self-stick resonant enclosure that responds to flush toilet fill valve water inflow vibration.
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Canfield, Eric L.; Cheslock, Edward P., Self-stick resonant enclosure that responds to flush toilet fill valve water inflow vibration.
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Beiderman,Allan R.; Rexing,Patrick J., System and method for detecting a leak in a hydraulic fluid system.
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Fiore,Joseph C., Tank car loading control and monitoring system and method.
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Canfield, Eric L.; Soma, Scott; Canfield, James, Toilet bowl overflow prevention and water conservation system and method.
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Lee,Yong Jae; Lee,Jae hyuk; Cho,In Haeng; Kim,Joung Hun, Water leakage detecting device in dishwasher.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Retrofit hydraulic fluid leak detection system 원문보기