Improved Door Stops, suitable for Railway Waggons and the like..
Year: 1896

page_text: Date of Application, 30th July, 1896-Accepted, 3rd Oct., 1896
COMPLETE SPECIFICATION.
Improved Door Stops, suitable for Railway Waggons and
the like..
I, 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 reference to an improved door stop suitable for railway.
waggons and the like, the object being to provide a stop of a simple and durable
kind such as will arrest a door opening by gravity without undue shock. For
this purpose my improved stop is in the form of a lever combined with a spring
or buffer, preferably of india rubber, against which the lever is forced when struck
by the falling door. Such a combination may be variously arranged.
Fig. 1 of the accompanying drawings is a side elevation showing part of a
railway waggon fitted with one arrangement of my improved door stop. In this
arrangement 1 is a bracket adapted to be fixed to the outer end of the under-
frame 2 of a waggon and to which is hinged or jointed a lever arm 3 that depends
from a hinge-pin 4 and has an outward curvature at 3* so as to be in the path of a
door 5 turning downward about a horizontal axis 6. Between the bracket and
the depending lever arm is arranged an india rubber spring 7 that serves as a
buffer or cushion for the lever when this is struck by the opening door 5.
Fig. 2 is a similar view to Fig. 1, showing another arrangement in which the
bracket 1 is adapted to be applied to the lower surface of a waggon under frame 2
and has pivoted to it a lever 3, 3ª of the first order whose lower and longer arm 3*
hangs down, and is so curved that the door opening downward will come into contact
with it. Between the upper arm 3 of the lever and the inner surface of the
underframe 2 of the waggon, there is interposed an india rubber spring 7 which
may as shown be let into a recess in the lever arm.
Fig. 3 illustrates another arrangement in which the bracket is of angular shape,
one portion 1" fitting against the outer side, and another 1' against the underside of
the waggon underframe 2, and the shorter arm 3 of the stop lever extending
in an approximately horizontal direction below the under surface of the bracket
between which and the said shorter arm of the lever an india rubber spring 7 is
interposed.
Fig. 4 shows another arrangement wherein the lever is a spring lever formed
with a curved bend 3" and one arm 3* longer than the other 3, the shorter arm being
secured in the case of a waggon to the underframe 2, and an india rubber spring 7
being interposed between the two arms of the lever, and the longer arm 3* being
curved downward as shown so as to lie in the path of the waggon door when the
same, turning on its horizontal hinge, falls.
In each case, that arm of the lever against which the door, when opening will
come in contact, may be provided with a pad of cushioning material such as india
rubber arranged as shown for example at 8 in Fig. 2, to be struck by the opening
door. There may also be provided in connection with the lever 3, 3* in each
arrangement, a fixed bolt 9 and washer 10, as shown in Fig. 2, to prevent or limit
recoil of the lever.
Instead of a single india rubber spring in the form of a block, two or more
separate india rubber springs may be used arranged to bear one on the other or
arranged side by side.

page_text: Although in each arrangement 1 have referred to the use of springs made
of india rubber, because I consider such material well adapted for the purpose in
view, yet I do not limit the invention to the use of such material, as springs of
other material, for instance coiled metal springs, may be used.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. A door stop suitable for a railway waggon and the like, comprising a lever
combined with a spring or springs arranged to serve as a buffer or cushion for the
lever when the same is struck by an opening door and 'so avoid 'undue shock,
substantially as described.
2. My improved door stops constructed arranged and operating substantially as
herein before described with reference respectively to and shown in Fig. 1; in
Fig. 2; in Fig. 3; and in Fig. 4 of the drawings annexed..
DL: 201
PTI 1000
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.