Patent US3659870A successfully refreshed from Google Patents.
US3659870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Levelling valve assembly
Assignee: Aisin Corp
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Filing: 1970-09-25
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Granted: 1972-05-02
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Expires: 1990-09-25
Abstract
Abstract The levelling valve assembly controls the supply and discharge of air to and from a pneumatic spring by providing a valve operating lever supporting shaft separate from the drive shaft for converting the sensed variations of chassis height into a corresponding rotational movement with a damper device resiliently connected therebetween.
Inventors
- 👤 Teiji Okuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:10
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/052; B60G17/0523; B60G17/0525; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87056; Y10T137/87064; Y10T137/87153; Y10T137/87161
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
215 words
A levelling valve assembly comprising: a. a main body positioned between a vehicle chassis and a vehicle axle and connected pneumatically with a high pressure air reservoir, a low pressure reservoir and a pneumatic spring; b. a drive shaft mounted in part of bore means formed in said main body, a chassis height sensing arm being supported on one end of said shaft and adapted for conversion of chassis height variation into a corresponding angular movement; c. a supporting shaft for supporting a valve-operating lever, said shaft being mounted in said housing with one end thereof extending into said bore means; d. a control lever fixedly attached to said supporting shaft; e. control valve means comprising a discharge valve and a supply valve, said valves being adapted for being controlled by said control lever; f. a damping mechanism provided between said drive shaft and said supporting shaft; g. a piston slidably mounted within said damping mechanism; h. a resilient connecting member, one end of the latter being kept in engagement with said drive shaft and the opposite end being kept in engagement with said piston; and i. a connecting lever one end of which is attached to said supporting shaft and the opposite end of which is adapted for cooperation with said resilient connecting member.
Claim 2
Dependent Claim
215 words
A levelling valve assembly comprising: a. a main body positioned between a vehicle chassis and a vehicle axle and connected pneumatically with a high pressure air reservoir, a low pressure reservoir and a pneumatic spring; b. a drive shaft mounted in part of bore means formed in said main body, a chassis height sensing arm being supported on one end of said shaft and adapted for conversion of chassis height variation into a corresponding angular movement; c. a supporting shaft for supporting a valve-operating lever, said shaft being mounted in said housing with one end thereof extending into said bore means; d. a control lever fixedly attached to said supporting shaft; e. control valve means comprising a discharge valve and a supply valve, said valves being adapted for being controlled by said control lever; f. a damping mechanism provided between said drive shaft and said supporting shaft; g. a piston slidably mounted within said damping mechanism; h. a resilient connecting member, one end of the latter being kept in engagement with said drive shaft and the opposite end being kept in engagement with said piston; and i. a connecting lever one end of which is attached to said supporting shaft and the opposite end of which is adapted for cooperation with said resilient connecting member.
Claim 3
Dependent Claim
19 words
Levelling valve assembly as claimed in claim 1, wherein said resiliently connecting member is a closedly wound coil spring.
Claim 4
Dependent Claim
27 words
Levelling valve assembly as claimed in claim 1, wherein said resilient connecting member is positioned normally with a certain predetermined idle gap relative to said connecting lever.
Claim 5
Dependent Claim
25 words
Levelling valve assembly as claimed in claim 1, wherein said supporting shaft for said control lever is exposed at its both ends to open atmosphere.
Claim 6
Dependent Claim
41 words
Levelling valve assembly as claimed in claim 1, wherein an air filter made of a sintered porous metal is inserted between an inlet for introducing the high pressure air and the air introducing valve provided and mounted in said main body.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |