US3690736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure modulating apparatus
Assignee: Individual
•
Filing: 1970-10-05
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Granted: 1972-09-12
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Expires: 1990-10-05
Abstract
Abstract Fluid pressure regulating apparatus for incorporation in a hydraulic braking system of a vehicle, includes an electrically actuated spring driven reciprocable plunger device providing periodic increase and decrease of the available volume in the system for varying the braking pressure and therefore the braking force exerted by the system. Plunger movement is controlled by the combination of fluid pressure in the system, a spring having a negative deflection rate, and an armature moveable in accordance with a magnetic flux field. The spring and armature cooperate in providing rapid movement of the plunger in a direction to quickly reduce braking pressure for avoiding skidding.
Inventors
- 👤 Richard L Smirl
- 👤 Richard D Kerestury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:32
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4266; B60T8/72; B60T8/74; Y; Y10; Y10S; Y10S188/00; Y10S188/02; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
222 words
Fluid pressure modulating apparatus for connection to a fluid circuit of a fluid pressure actuated braking system, said modulating apparatus including an expansion chamber communicable with said fluid circuit, having a displaceable wall member operatively associated therewith movable for varying the volume of said chamber; including a reciprocable control device having a drive member abuttable with said displaceable wall member for controlling movement thereof toward and from a position defining minimum volume in said chamber, said control device including motor means energizable in response to a preselected braking condition for moving said drive member in a first direction releasing said wall member for movement with respect to said chamber, resilient biasing means connected to said motor means yieldably opposing movement of said drive member in said first direction, said biasing means including a diaphragm spring having a negative deflection rate providing an opposing force of diminishing magnitude in response to movement of said drive member through a portion of its stroke in said first direction, and an energy absorbing device having a positive load-deflection rate arranged and disposed for engagement with said drive member during a terminal portion of drive member movement in said first direction for resiliently absorbing the kinetic energy thereof, said energy absorbing device providing means implementing return movement of said drive member upon deenergization of said motor means.
Claim 2
Dependent Claim
222 words
Fluid pressure modulating apparatus for connection to a fluid circuit of a fluid pressure actuated braking system, said modulating apparatus including an expansion chamber communicable with said fluid circuit, having a displaceable wall member operatively associated therewith movable for varying the volume of said chamber; including a reciprocable control device having a drive member abuttable with said displaceable wall member for controlling movement thereof toward and from a position defining minimum volume in said chamber, said control device including motor means energizable in response to a preselected braking condition for moving said drive member in a first direction releasing said wall member for movement with respect to said chamber, resilient biasing means connected to said motor means yieldably opposing movement of said drive member in said first direction, said biasing means including a diaphragm spring having a negative deflection rate providing an opposing force of diminishing magnitude in response to movement of said drive member through a portion of its stroke in said first direction, and an energy absorbing device having a positive load-deflection rate arranged and disposed for engagement with said drive member during a terminal portion of drive member movement in said first direction for resiliently absorbing the kinetic energy thereof, said energy absorbing device providing means implementing return movement of said drive member upon deenergization of said motor means.
References Cited (Backward Citations)
US3231315A
Cited
US3486800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |