Patent US3799571A successfully refreshed from Google Patents.
US3799571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overload spring
Assignee: LOADSTAR Corp A CORP OF NV
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Filing: 1972-06-23
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Granted: 1974-03-26
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Expires: 1992-06-23
Abstract
Abstract An overload spring, in the form of a leaf spring is described, which is used in combination with a multi-leaf semi-elliptical spring designed to carry the axle''s load above the spring. The overload spring is also substantially semi-elliptical with a bight formed midway between the ends to allow the elliptical portion to coextend with the main leaf of the multi-leaf spring and to allow the bight to extend over the axle. Means are provided on the axle to prevent the bight from closing as the leaves bend and flex.
Inventors
- 👤 E Sudberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:24
CPC Classifications
B; B60; B60G; B60G11/00; B60G11/02; B60G11/04; B60G11/32; B60G11/34; B60G11/38; B60G11/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
In combination: a road vehicle having an axle, chassis and a multi-leaf semielliptical spring with a main leaf spring secured to said chassis by shackles, and secured to the axle, with the axle disposed betWeen the spring and chassis; an overload spring having an elongated bar shaped with a bight formed at the mid-section, with a pair of portions on opposite sides thereof; said overload spring having the portions on opposite sides of said bight disposed adjacent the main leaf of said multi-leaf spring with the axle disposed within said bight; and means for securing in sliding relationship the ends of said overload spring to said main leaf to cause the overload spring to flex with the main leaf to aid in load carrying capacity thereof.
Claim 2
Dependent Claim
126 words
In combination: a road vehicle having an axle, chassis and a multi-leaf semielliptical spring with a main leaf spring secured to said chassis by shackles, and secured to the axle, with the axle disposed betWeen the spring and chassis; an overload spring having an elongated bar shaped with a bight formed at the mid-section, with a pair of portions on opposite sides thereof; said overload spring having the portions on opposite sides of said bight disposed adjacent the main leaf of said multi-leaf spring with the axle disposed within said bight; and means for securing in sliding relationship the ends of said overload spring to said main leaf to cause the overload spring to flex with the main leaf to aid in load carrying capacity thereof.
Claim 3
Dependent Claim
27 words
The combination of claim 1 wherein the opposite side portions of said bight on said overload springs are urged against said axle under substantially all load conditions.
Claim 4
Dependent Claim
24 words
The combination of claim 1 wherein said pair of portions on the elongated bar are elliptical with the bight disclosed on concave sides thereof.
Claim 5
Dependent Claim
45 words
The combination of claim 3, wherein said bight has two parallel portions connected by a straight portion, and said vehicle has a rubber shock absorber fixed to the underside of the chassis so that the absorber makes contact with said straight portion in overload conditions.
Claim 6
Dependent Claim
28 words
The combination of claim 4, wherein the curvature of said bar is chosen so that the parallel portion make contact with the axle under stubstantially all load conditions.
Claim 7
Dependent Claim
18 words
The combination of claim 5, wherein means are provided around said axle to maintain said straight portions apart.
Claim 8
Dependent Claim
29 words
The combination of claim 6, wherein said means for securing includes a U-shaped strap draped over said overload spring and said main leaf, and a bolt is connected thereacross.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |