Improved Stops or Cushioning Devices Specially Suitable for Use in connection with Railway Waggon Doors.
Year: 1896

page_text: Date of Application, 12th Feb., 1896-Accepted, 14th Mar., 1896
COMPLETE SPECIFICATION.
Improved Stops or Cushioning Devices Specially Suitable for Use
in connection with Railway Waggon Doors.
1, ALEXANDER SPENCER, of 77 Cannon Street, in the City of London,
Engineer, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement :-
This invention has for object to produce stops or cushioning devices (hereinafter
called stops) that shall be simple, cheap, strong, and efficient in construction and
such as can be advantageously used in connection with railway waggon doors
turning on horizontal or vertical hinges for the purpose of obviating the shock to
which they and the part against which they abut when quickly opened, are usually
subjected.
For this purpose my improved stops are constructed as I shall now proceed to
explain by the aid of the accompanying drawings wherein
Fig. 1 is a central section and Fig. 2 a face view showing one construction.
It comprises a case 1 made of stamped, pressed or cast metal, for example steel,
with an inwardly extending flange 1 at one end and two perforated lugs or
projections 1' at the other end whereby it can be fixed in place by the aid of screws
or bolts; a movable head 2 of stamped, pressed or cast metal having an outwardly
extending flange 2" that normally bears against the inner side of the flange 1ª which
thus limits the extent of its outward movement; and a loose block 3 of india-
rubber that is held in place when the stop is in use, between the head 2 and the
waggon door, frame or other part 4 (indicated by dotted lines in Fig. 1) to which
the case 1 is fixed. The block 3 has a central hole 3ª to receive a central
projection 2 on the inner side of the head 2 for the purpose of holding the block
centrally within the case 1.
For this
Fig. 3 is a central section showing a modified construction in which the block 3
of india rubber is permanently attached to the movable head 2.
purpose the latter which is of plate metal and of dished shape, is formed with
holes two of which are shewn at 1 through which is moulded the india rubber
which also extends over the outer side of the head, the india rubber being in
fact so moulded as to form two connected spring bodies, viz. a main spring bod
which provides for the greater amount of elasticity necessary, and a supplementary
spring body 3b that is united with the other by any suitable number of connecting
pieces 3 of india rubber and serves to receive the direct impact of the door or
other part and so prevent metallic contact between the same and the metal portion
of the head. The length of the spring body 3 may advantageously be made as
shown, slightly greater than the combined depth, (in the axial direction) of the
interior of the case and head, so that when the case is fixed in place upon any
object, the spring body will have an initial compression imparted to it.
Fig. 4 is a central section showing another modified construction of stop. In
this arrangement the case 1 and head 2 are similar to those shown in Fig. 3, but
the head is not perforated and the spring body of india rubber has moulded in it,
near its inner end, a perforated plate 5 so as to form connected main and
supplementary spring bodies 3, 36 respectively, whereof the latter provides a
reserve of elasticity for use when the stop is subjected to excessive blows. The
plate 5 in addition to in a manner separating the two spring bodies serves as a
guide plate to maintain them practically central within the case and head. The

page_text: axial length of the combined india rubber parts 3, 3c 3b is made slightly greater
than the axial depth interually of the case and head, for the purpose hereinbefore
mentioned.
As will be seen, the construction in each case is very simple, and such as will
be able to successfully withstand rough usage for a long time.
Although I have shown the case 1, head 2 and spring body 3 or bodies 3, 3b
and also the guide plate 5, as of circular shape in end view, they may obviously be
of other shapes. Furthermore it will be evident that a back plate may be applied
to the cases 1.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
-claim is :-
Stops or cushioning devices constructed substantially as hereinbefore described
with reference respectively to and shown in the several examples illustrated in the
drawings annexed.
W. Lloyd Wise,
ALEX. SPENCER.
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.