Improvements in Apparatus for Giving a Step by Step Motion to Indicators and other Mechanism.
Year: 1891

page_text: Date of Application, 5th Sept., 1891
Complete Specification Left, 4th June, 1892-Accepted, 23rd July, 1892
Improvements in Apparatus for Giving a Step by Step Motion to
Indicators and other Mechanism.
I, ERNEST CLUSE HAINES, of Hygeia House, Staines, in the County of
Middlesex, Merchant, do hereby declare the nature of this invention to be as
follows:-
The apparatus is provided with a right and a left hand ratchet fixed side by
side on a common axis and there are two pawls working one into the teeth of
one ratchet and the other into the teeth of the other ratchet only one pawl being
in action at the same time. These pawls are pivotted to two flaps hinged to a
common axis. Beneath each flap is an air bag. The axes of the pawls are
provided with springs which when the flaps are raised press the pawls into the
teeth of the ratchets. The flaps have fixed to them other pawls which take into
the teeth of the other ratchet to that with which the pawl hinged to the flap
engages.
By alternately forcing air into and withdrawing it from one of the air bags a
step by step motion is given in one direction to the ratchet axis whilst the motion
is reversed if air be similarly forced into and allowed to escape from the other bag.
One or both pawls may be made to reverse the movement by acting on one
end of a rocking lever whose other end engages with the ratchet.
Air 'may be forced into and withdrawn from the bags in the ordinary manner
by elastic balls connected to one end of a tube whose other end is connected to
the ball. In some cases however it is desirable to work the apparatus from an
air pipe in which the air is at a considerable pressure and in order to prevent
damage to the apparatus I adopt the following arrangement :-In place of con-
necting the air pipe directly to the bag I connect it to a vessel having its other
end closed by an elastic ball so that when air is admitted to the vessel it merely
compresses the ball and forces the air in the ball through a pipe into the bag
but the direct pressure from the air main does not enter the bag.
In some cases when used to actuate station indicators on a railway train I cause
the air bag or bags to be compressed at the proper moment by a flap having
an arm fixed to it which comes into contact with an incline or projection on the
railway.
Dated this 6th day of Sentember 1891.
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Giving a Step by Step Motion to
Indicators and other Mechanism.
I, ERNEST CLUSE HAINES, of Hygeia House, Staines, in the County of
Middlesex, Merchant, 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 :—
The apparatus is provided with a right and a left hand ratchet fixed side by side
on a common axis and there are two pawls working one into the teeth of one
ratchet and the other into the teeth of the other ratchet only one pawl being in
action at the same time. These pawls are pivotted to two flaps hinged to a
common axis. Beneath each flap is an air bag. The axes of the pawls are pro-
vided with springs which when the flaps are raised press the pawls into the teeth of

page_text: apparatus. O are branches from the main air pipes leading into vessels PP
having fixed in them the elastic balls Q each of which communicate by the pipes R
with one of the air bags K which therefore are not worked by the direct pressure
of the main air pipe but indirectly by the compression of the ball Q.
Figures 6 to 9 show a modification.
Figure 6 is a front elevation partly in section.
Figure 7 a side elevation and Figures 8 and 9 show a detail.
In this case the double ratchet wheel G is replaced by a pin wheel also marked G
and the two pawle H H are both pivotted at H to a single rocking piece or flap H"
pivotted at J and shown in plan at Figure 8 and in front elevation at Figure 9.
The springs for keeping the pawls in gear are replaced by weighted tail pieces h
and h. The rocking piece H" is actuated by a connecting rod S pivotted to it
at S¹ whose other end is pivotted at S to a piston rod fixed to a flexible diaphragm
within the spherical case P. In this case only a single air pipe O is required as
the motion is reversed by turning one or other of the pawls H back out of gear
with the pins. The rocking piece H" bears against a head T carrying & pin T¹
upon which is a spring U having at its ends collars V V working between two
abutments W W fixed to the frame of the apparatus. Any motion therefore of
the rocking piece H" compresses the spring U which tends to keep the piece H
in its ansition
ERNEST CLUSE HAINES.