Year: 1898

page_text: A communication from abroad by SIDNEY PRESCOTT WOOD, of Semaphore Works,
Newport, Melbourne, in the Colony of Victoria, Engineer.
I, WALTER HOLLAND, of Vulcan Works, in the City and County of Worcester,
England Engineer, do hereby declare the nature of this invention to be as
follows:-
-
This invention relates to means for locking the points of outlying sidings of
single-line railways worked on electric or other staff systems. For this purpose
there have hitherto been employed lever-locks having springs and tumblers. Now
these locks have at times given considerable trouble owing to the breaking or
deterioration of the springs resulting from atmospheric influences. This inven-
tion has for object to obviate this inconvenience, and to this end according thereto
there is provided a lock which is destitute of springs and in which the bolt is both
withdrawn and shot by means of a worm rotated by a key of special form attached
to a staff and means are provided to insure that the key cannot be inserted or with-
drawn unless the parts of the lock be in their locking position.
Such a lock may comprise a casing consisting of a main or lower part or casting
and a cover suitably secured together by means of bolts or set-screws and nuts.
The locking bolt may be arranged to slide in the lower part and is engaged by a
worm or cam formed on a cylinder, which is mounted to rotate on a stud secured
to the lower part of the casing and is provided with a boss in which is formed a
notch or key-way. The cylinder may be kept in position on the stud by a head
equal in diameter to the boss and having a key-way or notch similar to that of the
boss, the arrangement being such that in the normal and locking position of the
parts the two key-ways or notches are in line. The key attached to the staff may
be, or terminate in, a hollow cylinder having a short internal projection, or lug;
and the head on the aforesaid stud may be such as to prevent the key from being
engaged with or disengaged from the boss of the cylinder except when the latter
is in its locking-position, the projection or lug of the key passing behind the head
of the stud when the cylinder is turned away from its locking-position. The two
parts of the casing may form a way to guide the key upon the boss of the cylinder,
and the main or lower part is provided with a grooved or recessed part arranged
at right angles to the bolt and in which slides the cross rod that is connected to the
points to be controlled and in one or other of two holes therein the said bolt
normally engages.
It is obvious that a helical groove may, if desired, be employed as a substitute
for the worm hereinbefore mentioned and into which a part of the bolt extends.
L Tanum 1808

page_text: As will be obvious the details of construction may be variously modified. Thus
instead of making the head 6" of the stud 6 of the same diameter as the boss 5" of
the cylinder 5, it may be made larger in diameter than the said boss, as shown in
Fig. 7, so that when the end of the key 7 is engaged with the boss, it will prevent
the key from being disengaged from the boss except when the latter is in its lock-
ing position, the projection or lug 7" passing behind the said head when the
cylinder is turned away from its locking position. Or the stud 6 may be unpro-
vided with a head as shown in Fig. 8, the cylinder and boss being then retained end-
ways thereon by a pin 12. The boss 5" and also the stud head 6, when used,
instead of being made circular and formed with a keyway, may be made of square
or equivalent shape in end view and the end of the key for use therewith be of
corresponding shape. Fig. 8 shows the boss of square shape, and Figs. 9 and 10
in plan and end view respectively, a key suitable for use therewith. It will also
be obvious that the cylinder 5 instead of being provided with a projecting screw
thread or worm 4 as herein before described, may be formed with a helical groove
into which a part of, the bolt 3 extends.
A lock of the kind hereinbefore described can obviously be used for locking
railway signals as well as points.
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 locking device of the kind hereinabove referred to designed for use on rail-
ways, wherein the locking bolt 3 is both withdrawn and shot by means of a worm
or cam formed on or in a rotary part adapted to be operated by a suitable key, sub-
stantially as herein described.
2. In a locking device of the kind herein referred to, the combination with the
sliding locking bolt 3 of a rotary cylinder formed or provided with a worm, cam
or helical groove engaged with the said bolt, and with a boss or part adapted to
be engaged and operated by a correspondingly shaped key, substantially as herein-
before described with reference to the drawings annexed.
3. The improved locking means constructed arranged and operating as herein-
before described with reference to and shown in Figs. 1 to 6 inclusive, or modified
according to Fig. 7, or according to Figs. 8, 9 and 10 of the drawings annexed.
Dated this 4th day of July 1800
Dated this 4th day of Jul
day of July 1808
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.