An Improved Adjustable Crank specially applicable for Railway Signalling and Point Apparatus.
Year: 1897

page_text: Date of Application, 29th May, 1897
.
Complete Specification Left, 25th Feb., 1898-Accepted, 26th Mar., 1898
An Improved Adjustable Crank specially applicable for Railway
Signalling and Point Apparatus.
I, LEICESTER BRADNEY STEVENS, Engineer, of Darlington Works, Southwark
Bridge Road, in the County of Surrey, do hereby declaro the nature of this in-
vention to be as follows:-
4
This invention has for its object to enable the length of a crank arm to be
readily adjusted at will and securely fixed in any position.
In an adjustable crank constructed according to this invention and specially
applicable for railway point and signal apparatus, the crank consists of two
arms, one forming a part of a connecting cylinder mounted in a bracket by means
of pivot screws or ball bearings while the adjustable arm is screw threaded and
works in a corresponding internally screw threaded boss in the connecting cylinder
so that the effective length of the arm may be readily varied by screwing it more
or less through the said boss.
In order to lock the adjustable arm in any position, a longitudinal groove or
channel, in which a projecting feather in a washer engages, is cut in the sorew
threaded part, while a second projection on the washer engages in a recess in
the end of the connecting cylinder or vice versa. A lock nut then clamps the
washer firmly in position.
1
100
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
An Improved Adjustable Orank specially applicable for Railway
Signalling and Point Apparatus.
I, LEICESTER BRADNEY STEVENS, Engineer, of Darlington Works, Southwark
Bridge Road, in the County of London, do hereby declare the nature of this in-
vention 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 its object to enable the length of a crank to bo
readily adjusted at will and securely fixed in any position.
In the accompanying drawings:-
-
Fig. 1 is a plan of one form of adjustable crank constructed according to this
invention and specially applicable for railway point and signalling apparatus,

page_text: and Fig. 2 is an elevation of the same. Fig. 3 is an elevation of a modification
of the arrangement shown in Figs. 1 and 2.
Referring to Figs. 1 and 2 of the drawings, the crank consists of two arms a b,
one, a, formed integral with a connecting cylinder e mounted in a bracket d and
base by means of pivots or trunnions f, the said bracket and base being secured
together by bolts g as shown. The adjustable arm b is screw threaded and works
in a corresponding internally screw threaded hole in a boss h on the connecting
cylinder so that the effective length of the arm may be readily varied by
screwing it more or less through the said boss. The arm b is secured in any
position by means of a locking nut i.
In the modified arrangement shown in Fig. 3 the bracket is formed integral
with its base e, the cylinder c being mounted on pivot screws I as shown.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
-
1. An adjustable crank comprising two arms one formed integral with a con-
necting cylinder while the other is screw-threaded and works in a corresponding
screwthreaded hole in the said connecting cylinder substantially as described.
2. An adjustable crank specially applicable for railway signalling and point
apparatus arranged and constructed substantially as described with reference
tu Figs. 1 and 2, or to Fig. 3 of the drawings.
- Dated thin 95th Joy of Bahman 1908
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.