Railways – Car stops – Releasable feed
Patent
1984-10-16
1986-02-25
Reese, Randolph A.
Railways
Car stops
Releasable feed
104256, 188 32, B61K 718
Patent
active
045720800
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention relates to movable buffer stop apparatus for railway vehicles on a railway track, such as are used in railway marshalling yards, the apparatus including a stop which is movable between an operational location in which it is located in the path of a buffer of a railway vehicle on the track, and another location in which it leaves that path clear for through passage of a railway vehicle and for track maintenance.
UK-A-2056389 discloses an arrangement of movable buffer stop which comprises an hydraulic buffer which is mounted on massive support structure, the support structure being pivotable by extension or contraction of a telescopic hydraulic cylinder between its position in which the hydraulic buffer is located in tne path of the respective railway vehicle buffer and its stowing location, by pivotal movement of the support structure about a pivot axis which is substantially parallel to an adjacent railway line. Apart from the obvious disadvantages that follow from the necessary massive support structure, there is an additional disadvantage that, in practice, the stop can only be used as one of a pair of such stops, each cooperating with a respective one of a pair of buffers which are mounted adjacent the sides of a railway vehicle, and is not suitable for use to stop the kind of railway vehicle which has a single, centrally-located buffer. Also a considerable space between adjacent tracks has to be provided to allow stowage of the apparatus. Furthermore a powerful hydraulic cylinder has to be employed for moving the apparatus between the operational and stowing locations.
FR-A-2169252 and US-A-3828688 each disclose movable buffer stop apparatus comprising a single stop mounted at one end of an arm positioned between the rails of a railway track and pivotably mounted so as to be movable generally in the direction of the track to move the stop to and from its operational location in which it is positioned in the path of a centrally-located buffer of a railway vehicle moving on the track. The arm of the apparatus disclosed in FR-A-2169252 is fulcrumed on the buffer plunger of an hydraulic energy absorbing buffer and is movable about that fulcrum to and from the position in which it locates the stop in its operational location by an hydraulic cylinder which acts at the other end of the arm remote from the stop. This arrangement has the disadvantage that the hydraulic cylinder is loaded by reaction to an impact load to which the stop is subjected by a moving railway vehicle. That problem is avoided by the arrangement disclosed by US-A-3828688 but at the expense of substantial complexity. Although there are two energy absorbing devices arranged in parallel to share the impact loads, they take those loads in tension which limits the loads that can be taken without the apparatus disintegrating. Hence this apparatus is unsuitable for use to stop large freight wagons of the sizes currently being used.
An object of this invention is to provide movable buffer stop apparatus which can be adapted for use to stop moving railway vehicles which are fitted with buffers either singly at the center or in pairs at the sides of the vehicle and which does not suffer from the disadvantages of the known forms of movable buffer stop apparatus discussed above.
According to one aspect of this invention there is provided movable buffer stop apparatus for a railway vehicle on a railway track, the apparatus comprising an energy absorbing device which is fixed relative to the track when the apparatus is installed for use, a movable stop, a load bearing member and actuating means operable, when the apparatus is installed for use, to move the stop generally in the direction of the track between an operational location in which it is located in the path of a railway vehicle on the track and in which it is associated with the load bearing member such that impact of the stop by a railway vehicle moving on the track is transmitted to the energy absorbing device through the load bearing member and taken by the energ
REFERENCES:
patent: 3799064 (1974-03-01), Kikuchi et al.
patent: 3828688 (1974-08-01), Bradbury
Bushnell John J.
Thurlow John
Williams Derrick G.
Oleo International Holdings Limited
Reese Randolph A.
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