Improvements in Apparatus for Delivering Measured Quantities of Liquid.
Year: 1889

page_text: Date of Application, 21st Aug., 1889
Complete Specification Left, 22nd May, 1890-Accepted, 12th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Delivering Measured Quantities of
Liquid.
I, FRANCIS EDWARD MACMAHON of 24 Great Windmill Street, in the County
of Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
In the Specification of my former patent No. 12644 of the year 1888 I described
an apparatus for delivering measured quantities of liquid in which the liquid was
received into and delivered from a cylinder whose piston was allowed to travel a
certain distance dependent on the quantity of liquid to be delivered.
My invention relates to this class of apparatus.
In my present apparatus the cylinder is kept normally full and the piston is
allowed to descend a greater or less distance according to the amount it is desired to
deliver. The piston has fixed to it two pins which enter stepped slots in two plates
pivotted one on either side of the cylinder. By turning these plates about their pivots
through a greater or less angle different steps are brought beneath the pins on the
piston, so that the distance the piston can descend and the quantity of liquid delivered
is dependent upon the angle through which the slotted plates are turned. The slotted
plates are connected by a cross plate which is inclined to them at an angle different
from a right angle and a spring is provided which causes this inclined plate to bear
against the nose of a slide which is free to travel in a slot in the frame of the instrument.
By moving the slide and with it the inclined plate through a greater or less distance
the slotted plates are turned through a greater or less angle and the piston is allowed
to descend the proper distance to deliver the desired quantity of liquid.
Dated this 20th day of August 1889.
F. E. MACMAHON.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Delivering Measured Quantities of
Liquid.
I, FRANCIS EDWARD MACMAHON of 24 Great Windmill Street, in the County of
Middlesex, 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 :-
In the Specification of my former patent No. 12644 of the year 1888 I described
an apparatus for delivering measured quantities of liquid in which the liquid was
received into and delivered from a cylinder whose piston was allowed to travel a certain
distance dependent on the quantity of liquid to be delivered.
My invention relates to this class of apparatus.
In my present apparatus the cylinder is kept normally full and the piston is allowed
to descend a greater or less distance according to the amount it is desired to deliver.
The piston has fixed to it two pins which enter stepped slots in two plates pivotted
one on either side of the cylinder. By turning these plates about their pivots through
a greater or less angle different steps are brought beneath the pins on the piston, so that
the distance the piston can descend and the quantity of liquid delivered is dependent upon
the angle through which the slotted plates are turned.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation and
Figure 2 is a plan of apparatus in accordance with my invention.
Figures 3 and 4 show like apparatus in another form.
In Figures 1 and 2 a is a cylindrical measuring vessel which (as described in the
Specification of my former patent above mentioned) contains a piston. Pins project
from this piston one on either side through slots in the side of the cylinder; one of
these pins is marked b. cis a rocking frame having in it holes c¹ to receive the pins b.
c² is one of the pivots about which the frame c can turn.
The holes care cut in steps and the position of the frame limits the distance the
piston is able to descend. The cylinder a is fixed by its foot to a pipe d and it is
by this pipe that the liquid is both admitted to the cylinder and drawn off from it.
e is a panel or convenient support to which the pipe d is fixed. f is a three way cock
also fixed to the panel e so that its upper passage may communicate with the pipe d
and its lower passage with another pipe g. The pipe 9 communicates with the cask
from which the liquid is to be drawn. The cask is raised above the apparatus.
In one position of the plug of the cock it allows communication between the pipes d
and g; this position is indicated in Figure 1. The cylinder a now fills with liquid
from the cask the piston rising to the top until it is stopped by the pins 6 or otherwise.
By turning the plug of the cock the pipe g can be placed in communication with the
spout whilst the connection with the cask is closed. The liquid then runs out of
the spout and the piston descends until the pins 6 become supported by the frame c.
The quantity drawn off consequently depends on the position in which the frame c is
placed and this is regulated as follows:-The slotted side plates of the frame are
connected by a cross plate c* which is inclined to them at an angle different from a
right angle and a spring is provided which causes this inclined plate to bear against
the nose of a slide which is free to travel in a guide slot or passage k in the frame
of the instrument. By moving the slide i and with it the inclined plate through a
greater or less distance the slotted plates are turned through a greater or less angle
and the piston is allowed to descend the proper distance to deliver the desired quantity
of liquid.
In Figures 3 and 4 a is the cylinder containing a piston as before; ax is an
adjusting screw for regulating the height to which the piston rises, 6 is the pin on the
piston, one only is shown and it will be found sufficient. c is the rocking frame, the
step pieces upon it are so arranged as to be capable of adjustment. The pipe d passes
from the foot of the cylinder a to a three way cock as shown in Figures 1 and 2 and
another pipe similar to g connects the cock with the cask.
As before the position of the frame c controls the quantity drawn at each operation.
The frame c is actuated as follows:-It has gear teeth upon it engaging with a toothed
arc k on an axis k. is a pointer either on the axis k or on another axis connected
with it by a spigot joint, the latter arrangement is preferable and more convenient
in fitting. The pointer has a handle upon it by which it is moved over a scale on
which the quantities to be drawn are marked.
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. Apparatus for delivering measured quantities of liquid consisting of a measuring
cylinder and a piston and a cock so connected therewith that in one position of the
plug it allows the measuring vessel to fill and the piston to rise; and in another
position allows the measuring vessel to empty by a spout and the piston to fall; there
being also controlling stops regulating the travel of the piston according to the amount
to be delivered.
2. Apparatus substantially as described and illustrated by the annexed drawings.