US4763882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated coil spring
Assignee: NHK Spring Co Ltd
•
Filing: 1986-11-20
•
Granted: 1988-08-16
•
Expires: 2006-11-20
Abstract
Abstract A coated coil spring wrapped in a coating member prepared from a soft synthetic resin foam, wherein the coating members of the respective coil spring turns constituting at least the effective region of the coil spring are provided with a helical clearance; and the width of said clearance accounts for 0.15 to 0.50 times the width of the adjacent coil spring turns.
Inventors
- 👤 Masakazu Nishiyama
- 👤 Chiharu Umetsu
- 👤 Akira Kebukawa
- 👤 Mituru Andoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:02
CPC Classifications
B; B60; B60G; B60G15/00; B60G15/02; B60G15/06; B60G15/067; B60G15/068; F; F16; F16F; F16F3/00; F16F3/08; F16F3/10; F16F3/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
A coated coil spring for use in a vehicle suspension, comprising a coil spring wrapped in a coating member of soft synthetic resin foam to form a plurality of coated coil spring turns of which the foam is effective to absorb energy applied to the spring by an exciting force and to suppress surging thereof, wherein a helical clearance is formed between adjacent turns of said coated coil spring turns located at least in an effective coil spring region, the width of said helical clearance is, when the coated coil spring is in an unloaded condition, defined as 0.15 to 0.50 times the distance between the respective coil spring turns, and adjacent turns of said coated coil spring being in contact with each other when the coated coil spring is operatively installed in said vehicle and is affected by the vehicle weight under a steady state condition; whereby energy absorption by said foam due to spring compression occurs immediately upon a departure from said steady state condition.
Claim 2
Dependent Claim
167 words
A coated coil spring for use in a vehicle suspension, comprising a coil spring wrapped in a coating member of soft synthetic resin foam to form a plurality of coated coil spring turns of which the foam is effective to absorb energy applied to the spring by an exciting force and to suppress surging thereof, wherein a helical clearance is formed between adjacent turns of said coated coil spring turns located at least in an effective coil spring region, the width of said helical clearance is, when the coated coil spring is in an unloaded condition, defined as 0.15 to 0.50 times the distance between the respective coil spring turns, and adjacent turns of said coated coil spring being in contact with each other when the coated coil spring is operatively installed in said vehicle and is affected by the vehicle weight under a steady state condition; whereby energy absorption by said foam due to spring compression occurs immediately upon a departure from said steady state condition.
Claim 3
Dependent Claim
30 words
The coated coil spring according to claim 1, wherein a thin film is provided in the interior of said coated coil spring to connect the adjacent coated coil spring turns.
Claim 4
Dependent Claim
22 words
The coated coil spring according to claim 2, wherein said thin film is curved toward the interior of the coated coil spring.
Claim 5
Dependent Claim
37 words
The coated coil spring according to claim 1, wherein an air duct is provided to establish communication between the inside and outside of the coating member of at least one of the respective coated coil spring turns.
Claim 6
Dependent Claim
17 words
The coated coil spring according to claim 1, wherein said coating material is prepared from polyurethane foam.
Claim 7
Dependent Claim
100 words
The coated coil spring of claim 1, wherein said soft synthetic resin foam comprises: (a) 50-65% polyol of polyester series by weight; (b) 0-15% polyol of polyether series by weight; (c) 3-10% petroleum base resin by weight, which serves as a filler; (d) 1.7-2.2% water by weight; and (e) isocyanate, the % by weight of which is determined by: multiplying the % by weight of (a), (b) and (d) by the corresponding equivalents, obtaining the total of the products, multiplying the total by the equivalent of the isocyanate, and dividing this product by a value ranging between 1.0 and 1.05.
References Cited (Backward Citations)
US2103946A
Cited
US2230069A
Cited
GB690340A
Cited
US3096084A
Cited
DE1660341A1
Cited
US3606295A
Cited
DE7807245U1
Cited
US4264743A
Cited
JPS5712074A
Cited
US4477061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |