Improvements in Cranks for Use in Railway Signalling.
Year: 1895

page_text: Date of Application, 14th Oct., 1895
Complete Specification Left, 10th July, 1896-Accepted, 15th Aug., 1896
PROVISIONAL SPECIFICATION..
Improvements in Cranks for Use in Railway Signalling.
1, ARTHUR GEORGE EVANS, of 116 Palace Chambers, Bridge Street,
Westminster, in the County of Middlesex, Civil Engineer, do hereby declare
the nature of this invention to be as follows:-
My invention has reference to improvements in the construction of cranks and
in the methods of adjustment for the same.
The present form of crank has adjustable sliding pieces on the arms, which are
held in position by set screws. It is only usual to provide one slide piece to one
arin of the crank, the other arm not being capable of adjustment unless provided
with another slide piece. There is also no ready adjustment for regulating the
height of one arm above the other. To accomplish this with the present crank,
one arm is bent above the other or a wider boss is provided between the arms;
these differences in height are arranged in the construction of the crank and any
alteration afterwards is difficult and expensive.
With my present invention I arrange a base plate with a curved vertical
retaining arm having an open jaw at the top. A cast iron boss or falcrum piece
is provided with 2, 3, 4 or any number of horizontal slots at right angles to each
other, through which slots straight arms are inserted and held in position by set
screws. The fulcrum piece top and bottom is formed into a pivot or projection;
the lower one is placed in a recess or hole in the base plate and the upper one
placed inside the jaw in the retaining arm, a filling up block is then put next the
upper pivot of the fulcrum piece and a blade put through the jaw, retaining piece
and the block, thus securely keeping the said boss or fulcrum piece in position.
By slackening the set screws the crank arms can be lengthened and shortened
with reference to the fulcrum and the vertical adjustment can be obtained by again
slackening the set screws and placing the arms through any of the slots in the
fulcrum piece that is required to give the necessary adjustment.
Dated this 14th day of October 1895.
JOHN P. O'DONNELL, Fel. Chart. Inst. P.A.,
70 & 71 Palace Chambers, Westminster, S.W.,
Agent for the said Applicant.
I, ARTHUR GEORGE EVANS, of 116 Palace Chambers, Bridge Street,
Westminster, in the County of Middlesex, Civil 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 :-
My invention has reference to improvements in the construction of cranks and
in the methods of adjustment for the same.
The present form of crank has adjustable sliding pieces on the arms, which are
held in position by set screws. It is only usual to provide ono slide piece to one
D1

page_text: arm of the crank, the other arm not being capable of adjustment unless provided
with another slide piece. There is also no ready adjustment for regulating the
height of one arm above the other. To accomplish this with the present crank
one arm is bent above the other or a wider boss is provided between the arms;
these differences in height are arranged in the construction of the crank and any
alteration afterwards is difficult and expensive.
With my present invention I arrange a base plate with a curved vertical
retaining arm having an open jaw at the top. A cast iron boss or fulcrum piece is
provided with 2, 3, 4, or any number of horizontal slots at right angles to each
other, through which slots straight arms are inserted and held in position by set
screws. The fulerum piece top and bottom is formed into a pivot or projection;
the lower one is placed in a recess or hole in the base plate and the upper one
placed inside the jaw in the retaining arm; filling up blocks are then inserted next
the upper and lower pivots of the fulcrum piece and bulls passed through the jaws
and the said blacks, thus securely keeping the said boss or fulcrum piece in position.
In order that my invention may be better understood 1 will describe it with
reference to the accompanying drawing in which :-
Figure 1 is a front elevation of the higher form of crank, provided with vertical
adjustment as well as longitudinal.
Figure 2 is a plan of Figure 1.
Figure 3 illustrates a low form of crank, provided with horizontal adjustment,
but not vertical.
Figure 4 is a side elevation partly in section of Figure 3 showing the connection
of the fulcrum piece or loss with the retaining carriage of the crank.
: —
The enme letters refer to the same parts in the several figures of the drawing:
a is the cast iron boss or fulcrum piece, b, c and d are the slots through the said
fulcrum piece a, is the bottom pivot and the upper pivot of the said boss or
fulcrum piece, g and are the crank arms, is the retaining arm of the crank
carriage, is the upper block and the lower block through which the bolts are
passed for keeping the fulcrum piece or boss a securely in position.
By slackening the set screws in the crank arms can be lengthened and shortened
with reference to the fulcrum, and vertical adjustment can he obtained by again
slackening the set screws and placing the arms through any of the slots in the
fulcium piece that is required to give the necessary adjustment,
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that I
claim is :-
1. In a crank for railway signalling purposes, a boss or fulcrum piece with pivots,
above and below, through which slots are made to receive crank arms, substantially
as and for the purposes herein described.
2. In a crank for railway signalling purposes, obtaining adjustment both vertically
and longitudinally by means of the boss or fulcrum piece with separate crank arms
substantially as herein described and as illustrated on the accompanying drawings.
Hot his Och du f. 1806
JOHN P. O'DONNELL, Fel. Chart. Inst. P.A.,
Palace Chambers, Westminster, S.W.,
Agent for the said Applicant.