Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Reexamination Certificate
1997-08-12
2001-08-14
Graham, Matthew C. (Department: 3613)
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
C188S266500, C188S322150
Reexamination Certificate
active
06273224
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to shock absorbers for use in automotive vehicles and more particularly to vibration dampers of the type which are mounted upon the shock absorber and are electromagnetically actuated to damp vibrations.
Such shock absorbers are traditionally constructed by having a damping piston which is fastened to a piston rod which divides the work cylinder into two chamber halves filled with a hydraulic damping fluid. The piston typically incorporates valves for restricting the flow of fluid therethrough as the piston moves along the cylinder. The valves are designed to provide a greater resistance in one direction of the piston movement than the other. These valves are usually preset during manufacture and the setting of these valves is not suitable for all vehicle load conditions generated by surfaces over which the vehicle may be driven and/or the speeds at which the vehicle may be driven.
To accommodate varying loads, road surfaces, driving conditions and the like, shock absorbers have been produced with adjustable piston valves and/or with additional controlled valves as a part thereof. These valves for the most part have been adjustable externally of the shock absorber either manually or electromechanically. In some instances, electromagnetically operated damping valves have been included to accommodate this additional adjustable feature. Typical of such, prior art adjustable hydraulic vibration dampers included within shock absorbers are the devices disclosed in U.S. Pat. Nos. 4,638,896; 5,559,700; 5,409,089; 4,723,640; 4,785,920; 4,854,429.
SUMMARY OF THE INVENTION
A shock absorber mounted electromagnetically operated damper valve for regulating the flow of fluid through the shock absorber to accommodate varying road conditions which damper valve includes a housing defining a plurality of openings. A spool means is reciprocally mounted within a hollow interior of the housing and is moveable between first and second positions responsive to electromagnetic energization thereof A retainer means is provided within the hollow interior of the housing and includes a hollow tube which is spaced from the surface of the housing to define a space within which a skirt of the spool means is seated.
Other objects and advantages of the present invention will become more apparent to those persons having ordinary skill in the art to which the present invention pertains from the foregoing summary taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 2548239 (1951-04-01), Ray
patent: 3523677 (1970-08-01), North
patent: 4463969 (1984-08-01), Harrison
patent: 4638896 (1987-01-01), Poyser
patent: 4723640 (1988-02-01), Beck
patent: 4785920 (1988-11-01), Knecht et al.
patent: 4854429 (1989-08-01), Casey
patent: 4858956 (1989-08-01), Taxon
patent: 5018797 (1991-05-01), Takata
patent: 5096025 (1992-03-01), Herberg
patent: 5168965 (1992-12-01), Huang
patent: 5207300 (1993-05-01), Engel et al.
patent: 5409088 (1995-04-01), Sonsterod
patent: 5409089 (1995-04-01), Rapp et al.
patent: 5476245 (1995-12-01), Augustin
patent: 5522484 (1996-06-01), Sawai
patent: 5559700 (1996-09-01), Majeed
patent: 5690195 (1997-11-01), Kruckemeyer et al.
patent: 5810127 (1998-09-01), Schmidt
patent: 3402 117 A1 (1985-07-01), None
patent: 721370 (1955-01-01), None
Fulbright & Jaworski L.L.P.
Graham Matthew C.
HR Textron Inc.
LandOfFree
Shock absorber mounted electromagnetically operated damper... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Shock absorber mounted electromagnetically operated damper..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shock absorber mounted electromagnetically operated damper... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2531823