Patent US3019178A successfully refreshed from Google Patents.
US3877288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for checking effectiveness of vibration dampers or shock absorbers on motor vehicles
Assignee: ZF Boge GmbH
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Filing: 1973-03-09
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Granted: 1975-04-15
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Expires: 1993-03-09
Abstract
Abstract A device for checking the effectiveness of vibration dampers or shock absorbers associated with vehicle wheels includes a vertically vibratable platform onto which the vehicle wheel is driven, and a drive device connected through a spring for vertically vibrating this platform and hence vibrating the wheel and its axle. When the drive is terminated the ensuing vibrations are measured by the cooperation between a stylus which moves with the platform and a recording medium fixed to the frame. The vibrating wheel will pass through its complete range of frequencies before coming to a standstill. The amplitude at the point of resonance is related to and indicative of the effectiveness of the damping action. Both the stylus and the recording medium are adjustable on the parts on which they are mounted to vary the starting positions of these elements relative to each other.
Inventors
- 👤 Alfred Schiefen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:44
CPC Classifications
G; G01; G01M; G01M17/00; G01M17/007; G01M17/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
254 words
A device for checking the effectiveness of vibration dampers associated with the wheels of a vehicle while on a vehicle, comprising: fixed frame support means; a wheel platform on which the wheel rests while still on the vehicle; a pair of generally horizontal parallel control levers pivotably connected at one of their ends to the frame means and pivotably connected to the wheel platform to support said platform for vertical oscillation; drive means for vibrating the wheel platform vertically to thus stimulate the mass of the wheel into co-vibration and hence operate the vibration dampers; spring means resiliently interconnecting the drive means and the wheel platform; and a recording means for recording the amplitude of the vibrations of the wheel platform, said recording means including a stylus operatively connected to the upper end of a stylus support member carried by and upstanding from one only of said levers, whereby the stylus moves over an arcuate path having a radius extending from said stylus to the pivotal connection of said one lever to said frame means, a recording medium carried by the frame and positioned to be engaged by the stylus as the latter moves to record the vibrations thereon, said recording medium being mounted for movement in a direction transversely of the path of said stylus, and means for adjustably connecting the lower end of the stylus support member to said one lever and adjustably connecting said recording medium to the frame for varying the starting position of the stylus on the recording medium.
Claim 2
Independent Claim
254 words
A device for checking the effectiveness of vibration dampers associated with the wheels of a vehicle while on a vehicle, comprising: fixed frame support means; a wheel platform on which the wheel rests while still on the vehicle; a pair of generally horizontal parallel control levers pivotably connected at one of their ends to the frame means and pivotably connected to the wheel platform to support said platform for vertical oscillation; drive means for vibrating the wheel platform vertically to thus stimulate the mass of the wheel into co-vibration and hence operate the vibration dampers; spring means resiliently interconnecting the drive means and the wheel platform; and a recording means for recording the amplitude of the vibrations of the wheel platform, said recording means including a stylus operatively connected to the upper end of a stylus support member carried by and upstanding from one only of said levers, whereby the stylus moves over an arcuate path having a radius extending from said stylus to the pivotal connection of said one lever to said frame means, a recording medium carried by the frame and positioned to be engaged by the stylus as the latter moves to record the vibrations thereon, said recording medium being mounted for movement in a direction transversely of the path of said stylus, and means for adjustably connecting the lower end of the stylus support member to said one lever and adjustably connecting said recording medium to the frame for varying the starting position of the stylus on the recording medium.
Claim 3
Dependent Claim
48 words
Apparatus as claimed in claim 1 wherein said recording medium is a flat surface rotatably driven about its center, and said stylus is positioned such that a line passing through said stylus and tangent to its arcuate path passes through said center of rotation of said recording medium.
Claim 4
Dependent Claim
40 words
Apparatus as claimed in claim 1 wherein said recording medium is a cylindrical surface rotatably driven about its longitudinal axis, and said longitudinal axis is oriented parallel to a line passing through said stylus and tangent to its arcuate path.
Claim 5
Dependent Claim
30 words
A device according to claim 1, said recording medium being a flat circular rotating surface, said stylus positioned to move generally radially over said surface as the wheel platform vibrates.
Claim 6
Dependent Claim
24 words
A device according to claim 1, said recording medium being a cylinder, and said stylus positioned to record on the surface of the cylinder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |