Patent US3726419A successfully refreshed from Google Patents.
US3726419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway car hydraulic cushioning unit with spray type discharge ports
Assignee: Pullman Standard Inc
•
Filing: 1971-02-17
•
Granted: 1973-04-10
•
Expires: 1991-02-17
Abstract
Abstract A railway car cushioning unit comprises a cylinder and piston and piston rod assembly reciprocally positioned therein. The cushioning unit is provided with a high pressure chamber and a draft chamber both of which are in communication with a flexible boot type reservoir. The piston rod moves through a bore provided in the cylinder head and the boot type reservoir also provides a dynamic seal for the chambers. A piston is provided with an elongated passage which communicates with the high pressure chamber through a metering orifice. Ports are provided for communicating the passageway with the flexible boot for the passage of fluid therebetween. The ports are of a configuration which provides a dispersed spray during the movement of the fluid between the passageway and chambers to the reservoir.
Inventors
- 👤 S Anderson
- 👤 J Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:36
CPC Classifications
B; B61; B61G; B61G9/00; B61G9/04; B61G9/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
In a hydraulic cushioning device for railway cars including: a hydraulic cylinder including a first cylinder head adjacent one end thereof, a second cylinder head disposed within said cylinder between an opposite open end of said cylinder and said first cylinder head, said second cylinder head having a longitudinal opening thereThrough, a piston slidingly positioned between said cylinder heads and providing on one side of said piston a high pressure chamber, a piston rod connected to said piston and positioned for sliding movement through said longitudinal opening, said rod having a passageway, metering means between said piston and said high pressure chamber providing for the metered flow of fluid from said chamber through said passageway during a buff impact, a flexible tubular reservoir having an open end portion, means sealingly connecting the other end of said tubular reservoir to said piston rod, second means connecting the open end portion of said reservoir to said second cylinder head, to provide for communication between said reservoir through said longitudinal opening with a draft chamber disposed on an opposite side of said piston, the improvement comprising: diffusing means including first and second bores intersecting within said piston rod and communicating with said passageway and said reservoir to convey fluid from said draft chamber and to disperse the same to said reservoir in a spray configuration.
Claim 2
Dependent Claim
222 words
In a hydraulic cushioning device for railway cars including: a hydraulic cylinder including a first cylinder head adjacent one end thereof, a second cylinder head disposed within said cylinder between an opposite open end of said cylinder and said first cylinder head, said second cylinder head having a longitudinal opening thereThrough, a piston slidingly positioned between said cylinder heads and providing on one side of said piston a high pressure chamber, a piston rod connected to said piston and positioned for sliding movement through said longitudinal opening, said rod having a passageway, metering means between said piston and said high pressure chamber providing for the metered flow of fluid from said chamber through said passageway during a buff impact, a flexible tubular reservoir having an open end portion, means sealingly connecting the other end of said tubular reservoir to said piston rod, second means connecting the open end portion of said reservoir to said second cylinder head, to provide for communication between said reservoir through said longitudinal opening with a draft chamber disposed on an opposite side of said piston, the improvement comprising: diffusing means including first and second bores intersecting within said piston rod and communicating with said passageway and said reservoir to convey fluid from said draft chamber and to disperse the same to said reservoir in a spray configuration.
Claim 3
Dependent Claim
34 words
The invention in accordance with claim 1, said bores having openings laterally spaced at their point of communication with said passageway and at their point of communication with said reservoir providing a single opening.
Claim 4
Dependent Claim
51 words
The invention in accordance with claim 1, with said bores at their point of communication with said passageway being laterally spaced and providing a pair of openings, and said bores converging and intersecting each other in said piston rod at a point providing a single opening communicating directly with said reservoir.
Claim 5
Dependent Claim
15 words
The invention in accordance with claim 1, said bores being disposed in relative converging relation.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |