Patent US3799064A successfully refreshed from Google Patents.
US3799064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retractable buffer stop
Assignee: Japan National Railways
•
Filing: 1973-01-24
•
Granted: 1974-03-26
•
Expires: 1993-01-24
Abstract
Abstract A retractable buffer stop of the type to be installed in a pit between the rails is disclosed. The buffer stop generally comprises an actuating arm, a pair of supporting arms and a hydraulic power cylinder which serves to raise or lower the actuating arm. They are so interconnected as to form a straightline mechanism in order to permit an impact head pivoted to the upper end of the actuating arm to make a straight linear motion in the horizontal direction when the car strikes against the buffer stop. The impact head is also coupled through a parallel linkage to the pivot pin at the lower end of the actuating arm so that the impact receiving surface of the impact head may be always maintained vertically. A hydraulic shock absorber is also provided to absorb the impact from the car. Since the impact head may make a straight linear motion in the horizontal direction and its impact receiving surface may be always maintained vertically the impact forces from the car may be uniformly distributed over the retractable buffer stop.
Inventors
- 👤 H Kobayashi
- 👤 T Kamei
- 👤 T Kikuchi
- 👤 T Motoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:18
CPC Classifications
B; B61; B61K; B61K7/00; B61K7/16; B61K7/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
A retractable buffer stop comprising a. an actuating arm (with the upper end of which strikes a coupling or the like of a car), b. a pair of supporting arms pivoted to a point between the upper and lower ends of said actuating arm for permitting the angular movement thereof, c. a connecting member pivoted to the lower end of said actuating arm so that said actuating member may swing relative to a stationary member, d. a hydraulic shock absorber interposed between said point of said actuating arm and a stationary member for providing the retarding or braking force when the car strikes the retractable buffer stop, and e. said actuating arm, said pair of supporting arms and said connecting member being so interconnected with each other as to form a straight-line mechanism so that the upper end of said actuating arm may make a straight linear motion in the horizontal direction when the car strikes against said upper end of said actuating arm.
Claim 2
Dependent Claim
164 words
A retractable buffer stop comprising a. an actuating arm (with the upper end of which strikes a coupling or the like of a car), b. a pair of supporting arms pivoted to a point between the upper and lower ends of said actuating arm for permitting the angular movement thereof, c. a connecting member pivoted to the lower end of said actuating arm so that said actuating member may swing relative to a stationary member, d. a hydraulic shock absorber interposed between said point of said actuating arm and a stationary member for providing the retarding or braking force when the car strikes the retractable buffer stop, and e. said actuating arm, said pair of supporting arms and said connecting member being so interconnected with each other as to form a straight-line mechanism so that the upper end of said actuating arm may make a straight linear motion in the horizontal direction when the car strikes against said upper end of said actuating arm.
Claim 3
Dependent Claim
44 words
A retractable buffer stop as defined in claim 1 wherein said connecting member comprises a hydraulic cylinder so that said actuating arm may be selectively held in raised operative position or in the lowered, retracted inoperative position by the actuating of said hydraulic cylinder.
Claim 4
Dependent Claim
63 words
A retractable buffer stop as defined in claim 2 wherein said hydraulic shock absorber has its base securely fixed to said stationary member and has a connecting rod pivotably fixed to the free end of the piston of said hydraulic shock absorber so that said hydraulic shock absorber may be operatively coupled to said point of said actuating arm through said connecting rod.
Claim 5
Dependent Claim
99 words
A retractable buffer stop as defined in claim 3 wherein said actuating arm has an impact head pivotably fixed to the upper end thereof, and the pivot pin with which said impact head is pivotably fixed to said upper end of said actuating arm is coupled through a parallel linkage to the pivot pin at the lower end of said actuating arm with which the latter is pivotably fixed to the piston rod of said hydraulic cylinder whereby the impact receiving surface of said impact head may be always maintained vertically regardless of the movement of said actuating arm.
Claim 6
Dependent Claim
80 words
A retractable buffer stop as defined in claim 4 wherein said parallel linkage comprises a crank rod having one end thereof fixed to said pivot pin of said impact head, a crank rod having one end thereof fixed to said pivot pin at the lower end of said actuating arm, a connecting rod pivoted to the other ends of said two crank rods, said connecting rod having a telescopic tube portion disposed at a suitable point between the ends thereof.
Claim 7
Dependent Claim
51 words
A retractable buffer stop as defined in claim 5 wherein said impact head comprises a box-shaped member pivotably fixed to said upper end of said actuating arm, a head member slidably fitted into said box-shaped member, and an initial load absorbing means interposed between said head member and said box-shaped member.
References Cited (Backward Citations)
GB699937A
Cited
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 |