Spring devices – Vehicle – Elastomeric
Reexamination Certificate
1999-06-24
2001-10-02
Schwartz, Christopher P. (Department: 3613)
Spring devices
Vehicle
Elastomeric
C188S268000
Reexamination Certificate
active
06296238
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a device for the damping of vibrations between objects, especially for preventing the transfer of vibrations from a primary object, subjected to vibrations, to a secondary object which is sensitive to vibrations.
In, for example, playback apparatus for audio and video discs with optical reading of rotating information-carrying discs and also in analogue record players, the functions of the respective optical laser pickup units, stylus pickups, gear drives and turntable details are extremely sensitive to vibrations from the surroundings.
SUMMARY OF THE INVENTION
An object of the invention is to suggest an improved device for preventing undesired vibrations being transferred to vibration-sensitive objects, i.e. to damp away or extinguish such vibrations. According to a first aspect of the invention, this function is solved in a device of the type mentioned in the introduction through the secondary vibration-sensitive object being non-rigidly supported by a damping body itself non-rigidly supported on the primary object, the damping body having the same or essentially the same size mass as the secondary object. It has been shown that placing a non-rigidly supported damping body between on the one side a supported object, which is to be protected from vibrations, and on the other side a vibrating object, wherein the mass of the damping body is the same or essentially the same as the mass of the supported object, provides an effective interruption in the transfer of vibrations to the supported object. Through such adjustment of the mass of the damping body to the mass of the supported object, they will dynamically be in an antiphase relationship to each other in such a way that the vibrations from below are extinguished by the damping body so that the supported object is not influenced by the vibrating body below it.
This principle for damping away vibrations is also applicable in the opposite case, where the supported object is a producer of vibrations, e.g. a compressor, washing-machine of the like and where the underlayer, e.g. a support or floor, is to be protected against vibrations.
REFERENCES:
patent: Re. 24654 (1959-06-01), Sheets
patent: 28619 (1860-06-01), Vose
patent: 4387453 (1983-06-01), Zolt
patent: 4436178 (1984-03-01), Gieger
patent: 5231541 (1993-07-01), Han
patent: 5433422 (1995-07-01), Ross et al.
patent: 5460357 (1995-10-01), Stewart
patent: 39 14 303 (1990-10-01), None
patent: 2 278 974 (1994-12-01), None
patent: 03 283173 (1991-12-01), None
patent: WO 95/28577 (1995-10-01), None
Maurice-A. Julien, Examen Synoptique, Sur Leurs Modèles Communs, Des Problèmes De Suspension ÀDeux Ètages Et D'Amortissement Dynamique Des Vibrations, Journal S.I.A., Oct. 1958, pp. 1-15.
Bartz C. T.
Schwartz Christopher P.
Young & Thompson
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