US3747714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorber pistons
Assignee: CARBON C DE
•
Filing: 1970-10-26
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Granted: 1973-07-24
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Expires: 1990-10-26
Abstract
Abstract In addition to the valve controlled passageways through the shock absorber piston, there are provided a series of permanently open passageways in the form of longitudinal grooves in the periphery of the piston, these grooves having shallow attenuated portions formed either by double bevels in the bottom surfaces thereof or by the intersection of an end surface of a groove with a bevel formed around the periphery of an end surface of the piston. The controlled passageways are governed by an annular disk clack valve floatingly mounted against a circular ridge on one surface of the piston and adapted to flex under the influence of compression and rebound movements of the piston to control flow of damping fluid around both edges of the annular valve disk. The sum of the widths of the peripheral grooves should not exceed about 15 to 20 percent of the circumference of the piston; and the outside diameter D of the clack valve minus the diameter d of the ridge divided by the diameter d should be not less than 15 percent.
Inventors
- 👤 Carbon C De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:57
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/3405; F16F9/348; F16F9/3484; F16F9/3481
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A shock absorber comprising a cylinder containing a supply of oil, a piston rod and piston reciprocatable within the oil in said cylinder, a plurality of permanently open passageways around said piston comprising longitudinal grooves formed in the side wall of said piston, the sum of the widths of said grooves not exceeding 15 to 20 percent of the circumference of said piston, a portion of the length of each of said groove being shallower than the remainder of the groove in order to produce a thinning or lamination of the oil passing through, the length of the thus attenuated portion of the groove being at most equal to 15 percent of the total height of the piston.
Claim 2
Dependent Claim
118 words
A shock absorber comprising a cylinder containing a supply of oil, a piston rod and piston reciprocatable within the oil in said cylinder, a plurality of permanently open passageways around said piston comprising longitudinal grooves formed in the side wall of said piston, the sum of the widths of said grooves not exceeding 15 to 20 percent of the circumference of said piston, a portion of the length of each of said groove being shallower than the remainder of the groove in order to produce a thinning or lamination of the oil passing through, the length of the thus attenuated portion of the groove being at most equal to 15 percent of the total height of the piston.
Claim 3
Dependent Claim
49 words
The shock absorber according to claim 1 in which one end surface of the piston is peripherally beveled and the grooves terminate at points short of said surface, each groove having an end surface intersecting the beveled portion of the piston to provide said attenuated portion at said point.
Claim 4
Dependent Claim
47 words
The shock absorber according to claim 1 in which each groove has a bottom surface having a double bevel forming a summit directed toward the wall of the cylinder, the distance from said summit to the wall of the cylinder defining the width of said attenuated portion.
Claim 5
Dependent Claim
25 words
The shock absorber according to claim 1 in which each of the grooves is wider adjacent at least one end thereof than at intermediate points.
Claim 6
Dependent Claim
94 words
The shock absorber according to claim 1 in which there are provided controlled passageways through the piston, and there is provided an annular supporting ridge on one face of the piston, and an annular disk clack valve adapted to be seated against said supporting ridge and to flex in alternatively opposite directions to meter the flow of oil through the piston around its inward and outward circumferences, the outside diameter Dof the clack valve and the diameter d of the circular ridge being such that D - d/d is not less than 15 percent.
Claim 7
Dependent Claim
92 words
The shock absorber according to claim 5 in which there is provided a washer rigid with the piston and having a diameter slightly greater than the inside diameter of the clack valve, said clack valve having one of its faces adjacent its inner circumference resting upon said washer, the said face of the piston upon either side of said support ridge being relieved, the relief surface of the portion on the inside of said ridge serving as a stop means for limiting the stressing of the valve under pressure in one direction.
Claim 8
Dependent Claim
25 words
The shock absorber according to claim 6 in which the diamter of said inside relief portion is greater than the inside diameter of said valve.
Claim 9
Dependent Claim
55 words
The shock absorber according to claim 6 in which a retaining disk is provided on said piston rod in the direction away from said piston and beyond said washer and said clack valve, the outside edge of said retaining disk positioned to act as a stop means for the clack valve during the compression stroke.
Claim 10
Dependent Claim
52 words
The shock absorber according to claim 8 in which the position of the piston surface relief and the said retaining disk in relation to the clack valve is such that respective valve contact is made when the slope of the angle of deformation of the valve is equal to about 10 pErcent.
References Cited (Backward Citations)
US2748898A
Cited
FR1077650A
Cited
US3003596A
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US3003594A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |