An Improved Lever Compensator for Working Distant Signals,
Year: 1898

page_text: Date of Application, 7th June, 1898
Complete Specification Left, 7th Mar., 1899-Accepted, 29th Apr., 1899
PROVISIONAL SPECIFICATION.
An Improved Lever Compensator for Working Distant Signals,
I, SAMUEL WALKEY GILLETT, of 17, St Ann's Square, Manchester, in the
County of Lancaster, Registered Patent Agent, do hereby declare the nature of
this invention, which has been communicated to me by Francis Gascoigne
Lynde, of Ahmedabad, India, Civil Engineer, to be as follows.-
This invention relates to an improved lever compensator for working distant
signals
In carrying the invention into effect a pulley grooved for two chains of different
sizes 18 mounted in a ball bearing carried by a casting bolted to the signal post
The pulley is provided with a crank pin and link on one side connected to the
semaphore or signal aim above it and on the other side the pulley has a pin
or projection which comes against a vertical 1b on the casting and so acts as
a stop to limit the rotary movement of the pulley beyond a certain amount
The larg
ger chain which passes over the pulley 18 connected at one end to a
heavy weight and at the other end to the operating wue from the signal lever.
The smaller chain which passes round the pulley in the opposite direction to
the large chain is attached at one end to the pulley and at the other end to the
weight The signal lever has a weighted arm at right angles to it or a weight
connected in any other suitable way to counterbalance the weight suspended
from the pulley chain The movement of the signal lever acting through the
connecting wire causes the partial rotation of the grooved pulley and thereby
raises or lowers the signal arm. In case the lever, wire or any of the gear should fail
and allow the weight to drop the smaller chain would immediately partially rotate
the pulley and put the crank pin to the top of the stroke and the signal arm
would fly to "danger' The pulley is provided with a tooth, or teeth, to engage
with the links of the larger chain as they pass round the pulley during the time
only that the signal armi is being moved, and this tooth is clear of the chain
after that movement is accomplished, so that the tooth (or teeth) prevents the
chain slipping while the work is being done and allows it to slip when the
work is finished. The movement of the weight 18 greater than is really required
for the operation of the signal arm and this idle portion of the stroke adjusta
the apparatus every time it is used As the vertical motion only of the crank
pin affects the signal arın the horizontal movements at the top and bottom of
the stroke allow for any small expansion and contraction but on a cold night
although the contraction of the wire might draw the weight right up to the
pulley the pin bearing against the vertical mb or stop prevents the signal arm
moving and the chain merely slides over the pulley so long as the contraction
of the wire continues
"
حيم
1
1000
H. B BARLOW & GILLETT,
Agents for Applicant.

page_text: An Improved Lever Compensator for Working Distant Signals.
I, SAMUEL WALKEY GILLETT, of 17, St Ann's Square, Manchester, in the
County of Lancaster, Registered Patent Agent, do hereby declare the nature of
this invention, which has been cominunicated to me by Francis Gascoigne
Lynde, of Ahmedabad, India, Civil Engineer, and in what manner the same
is to be performed, to be particularly described in and by the following state-
ment:-
-
This invention relates to an improved lever compensator for working distant
signals.
In the accompanying two sheets of drawings-
Figures 1 and 2 are views of an elbow lever having a weight at the end of
one arm and a signal wire attached to a suitable point in the other aim which
terminates in a handle, the lever being turned through half a circle to actuate
the signal arm.
Figure 3 illustrates an alternative mode of weighting the signal lever
Figure 4 is a view of a signal lever, pulley and band for actuating the alter-
native form of weighted signal lever shown in Fig 3
Figure 5 is a diagram showing the connections from the signal lever to the
semaphore
Figure 6 is a detail view of part of the signal post, chain-pulley and weight
Figure 7 is a sectional detail view of the chain pulley
In these views,-A designates the signal post, B the signal arm, C the signal
wire and large chain, D a weight connected to the end of the large chaan, E a
pulley grooved for two chains of different sizes, F the smaller chain, G a link
connected at one end by a wire to the signal arm B and at the other end to a
crank pin E on the chain pulley, H a casting or bracket bolted to the signal post
and carrying a ball bearing for the chain pulley and I a stop or buffer pin secured
to the said pulley which comes against a vertical 1b on the casting H and so
acts as a stop to limit the rotary movement of the pulley E beyond a certain
amount
Both the chains C and F pass over the pulley E but in opposite directions
the smaller chain F being attached at one end to the pulley and at the other
end to the weight D
The signal lever K has a weighted arm at right angles to it see Fig 1, to
counterbalance the weight D, in which case the lever les horizontally and 18
turned half a circle by a handle L to actuate the signal arm; or alternatively
the signal lever K may be weighted as shown in Fig 3 and be operated as
shown in Fig. 4 by means of a lever M, pulleys N, O, and band P
The movement of the signal lever K acting through the connecting wire and
chain C causes the partial rotation of the grooved pulley E and thereby raise8
or lowers the signal arm B.
In case the lever K line wire C or any of the gear should fail and allow the
weight D to drop the smaller chain F would take the weight and immediately
partially rotate the pulley E and put the crank pin E to the top of the stroke
and the signal arm B would thus fly to "dangar
The pulley E is provided with a tooth or teeth E to engage with the links
of the larger chain C as they pass round the pulley during the time only that
the signal arm B is being moved, and this tooth E is clear of the chain C after
that movement is accomplished, so that the tooth (or teeth) prevents the chain
slipping while the work is being done and allows it to slip when the work is
finished.

page_text: The movement of the weight D is greater than 18 really required for the
operation of the signal arm and this idle portion of the stroke adjusts the apparatus
every time it is used. As the vertical motion only of the crank pin E affects
the signal arm B the horizontal movements at the top and bottom of the stroke
allow for any small expansion and contraction, but on a cold night although
the contraction might draw the weight D right up to the pulley the pin I bear-
ing against the vertical rib or stop on the casting H prevents the signal aim
moving and the chain C merely slides over the pulley E so long as the contrac-
tion of the wire continues
The positions the weight D would occupy in high temperatures are indicated
in full lines and the positions in low temperatures are indicated in dotted lines
in Fig. 6
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed I declare that what
I claim 18:-
1 The combination with the signal lever and the line wire and chain for
actuating the same, of a grooved pulley which in mounted on the signal post
and connected to the signal arm and has only a partial rotation so that any
moderate expansion or contraction of the line wire will not affect the position
of the signal arm substantially as herein set forth.
2 The combination with the line wire and larger chain C, of the grooved
pulley E and its tooth or teeth E so alanged as to engage the links of the
chain C and prevent it slipping while the signal arm is being actuated, but to
be clear of the said chain and allow it to slip after that movement has been
accomplished substantially as herein set forth.
3. The combination with the line wire and chain C, weight D and grooved
pulley E, of the safety chain attached to the pulley and also to the weight
in order to place the signal arm at "danger" in the event of any failure of the
line wire and consequent fall of the weight D substantially as herein set forth
4 The combination with the line wire and chain C, weight D, grooved pulley E
and chain F, of a lever weighted to counterbalance the weight D and otherwise
arranged and operating substantially as described with particular reference to
Figs 1 to 4 of the drawings
5 The general combmation and arrangement of parts constituting the improved
lever and compensator for working distant signals.
Dated thin ath __L 1000
H B. BARLOW & GILLETT,
Agents for Applicant, 17, St Ann's Square, Manchester