Brakes – Internal-resistance motion retarder – Using magnetic flux
Reexamination Certificate
1999-10-20
2001-06-05
Oberleitner, Robert J. (Department: 3613)
Brakes
Internal-resistance motion retarder
Using magnetic flux
C267S182000, C267S136000, C188S378000, C248S638000
Reexamination Certificate
active
06241059
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vibration isolator for use in, for example, an ambulance for carrying sick or wounded people to make them more comfortable.
2. Description of the Related Art
Hydraulic or air suspensions are employed in most of the vibration isolators, and various measures have been taken up to this time to improve the riding comfort. Vibration isolators that perform an active control to improve the riding comfort have been proposed.
The running of ambulances includes ordinary running, in which they run with the stream of cars, and special running when they are called in an emergency. The riding comfort differs between the ordinary running and the special running.
In order to confirm the effects of the vibration isolators on the riding comfort, actual running tests were carried out using a typical domestic car and a typical imported car. During the tests, longitudinal (back and forth), widthwise (right and left) and vertical accelerations of a floor of an ambulance and those of the waist of a subject lying on a stretcher were measured and analyzed. The tests revealed that the conventional vibration isolators could achieve effective isolation in a high-frequency region (10-20 Hz), but could not satisfactorily restrain low-frequency vibrations (0.1-10 Hz), particularly the longitudinal and vertical low-frequency vibrations. For this reason, there arose the problems that the condition of a sick or wounded person may become worse due to resonance of his or her internal organs in particular, a fluctuation in blood pressure (a sense in which blood concentrates on the head) may be caused by a nose dive, or he or she may get carsick. Such problems were, however, sometimes caused by an improper adjustment of a suspension system of the vibration isolator to the vehicle body.
SUMMARY OF THE INVENTION
The present invention has been developed to overcome the above-described disadvantages.
It is accordingly an objective of the present invention to provide a vibration isolator for use in an ambulance that can restrain unpleasant feeling of a sick or wounded person, which has been hitherto caused by a sudden stop or rapid speed reduction, by making use of magnetic springs and magnetic dampers in a suspension mechanism of the vibration isolator.
In accomplishing the above and other objectives, the vibration isolator according to the present invention includes a lower frame movably mounted on a floor, an upper frame vertically movably mounted on the lower frame, a link mechanism coupled to the upper and lower frames, operable to move the upper frame relative to the lower frame, and a plurality of magnetic springs interposed between the upper and lower frames and each having a plurality of permanent magnets with like magnetic poles opposed to each other. In this vibration isolator, a vertical vibration of the upper frame relative to the lower frame is restrained by the plurality of magnetic springs, and the front side of the vibration isolator is lifted upon receipt of a forward acceleration.
Furthermore, an acceleration inputted in a direction longitudinally of the vibration isolator is restrained by virtue of a single-sided pendulum motion about an instantaneous center of rotation of the lower frame.
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patent: 4596373 (1986-06-01), Omi et al.
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Patent Abstracts of Japan, vol. 1996, No. 10, Oct. 31, 1996 & JP 08140780A (Delta Kogya Co Ltd), Jun. 4, 1996.
Chizuka Kazuyoshi
Fujita Etsunori
Sakamoto Yutaka
Delta Tooling Co., Ltd.
Kramer Devon
Oberleitner Robert J.
Wenderoth , Lind & Ponack, L.L.P.
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