A Pulsating Apparatus for use in connection with the Teats of Milking Machines.
Year: 1891

page_text: Date of Application, 17th June, 1891
Complete Specification Left, 17th Mar., 1892-Accepted, 23rd Apr., 1892
PROVISIONAL SPECIFICATION.
A Pulsating Apparatus for use in connection with the Teats of
Milking Machines.
We, ALEXANDER SHIELS, of 190 Bath Street, Glasgow, M.B., C.M., B.Sc.,
and WILLIAM ELLIOT, of Markgreen, Lanark, Cattle Salesman, do hereby
declare the nature of this invention to be as follows:-
This invention has for its object to produce pulsations in, or an alternate pressure
and relaxation of, the teats of milking machines, so that their action will be similar
to hand milking.
The teats preferably used are the "Shiels and Elliot" rubber teats.
To effect the above purpose, there is, under one arrangement, fitted to or in
connection with the suction tube of the apparatus or a branch tube, a tee piece
having a long bore or channel in it. In this bore or channel works a plunger or
piston reciprocated by means of a crank and connecting rod or any similar or
equivalent means. When the piston is forced in, it nearly closes (or closes) the
suction pipe and thereby reduces the suction and allows the rubber teat to expand.
When the piston is drawn out the suction pipe is clear and the full suction is
maintained on the teat and draws it in tightly around and against the cow's teat.
The
Under a modified arrangement the suction pipe communicates with a closed box
or vessel, which, in its turn, by another pipe, communicates with the teats.
end of the suction pipe projects into the box or vessel and has fitted telescopically
around it a cap or tube with the lower part cut away at a taper. The cap is
revolved by any suitable means and so that the tapered part comes at times, as it
revolves, over a hole cut in the inwardly projecting part of the suction pipe and
closes or partly closes up said pipe so reducing the suction, whilst, as it turns
round again, the cut out part frees the hole and allows the full force of suction to
act on the teats.
Instead of tapering the cap it may be made with a hole or opening in it.
The pulsator may be varied in its construction without departing from the
principle of the invention.
Dated this 16th dox of Luns 1801
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.
COMPLETE SPECIFICATION.
A Pulsating Apparatus for use in connection with the Teats of
Milking Machines.
We, ALEXANDER SHIELS, of 190 Bath Street, Glasgow, M.B., C.M., B.Sc.,
and WILLIAM ELLIOT, of Mark Green, Lanark, Cattle Salesman, 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 :-
This invention has for its object to produce pulsations in, or an alternate pressure
and relaxation of, the teats of milking machines, so that their action will be similar
to hand milking.
The teats, preferably, used are the "Shiels and Elliot" rubber teats, which are
capable of being expanded and contracted.

page_text: And in order that our said invention may be properly understood, we have here-
unto appended two explanatory sheets of drawings, whereon:-
Fig. 1 is a side elevation, and Fig. 2 a front elevation, partly in section, of one...
form of the apparatus.
Fig. 3 is a vertical section of a slightly different form of the apparatus.
Referring to the drawings, whereon the same reference letters, wherever repeated,
indicate similar or like parts.
The apparatus, Figs. 1 and 2, consists of a vertical standard K, carrying in
bearings, at its upper end, a short horizontal shaft M, which is revolved, by means
of a differential speed rope-pulley J, or by a wheel and handle, or by any other
well-known and suitable motor mechanism. Keyed to the front end of the shaft M,
is a fly wheel I. The fly wheel, which may be a disc, as shown, has, preferably,
a slot L' in it. The connecting rod H, H', is secured to the disc wheel I, by means
of a pin L, which passes through the head of the connecting rod, and the slot L¹,
being secured at the back of the wheel I, by a screw nut Q. L2 is a collar on the
pin L. The connecting rod is, preferably, made in two parts H, H', as shown, the
parts being screwed at their ends, and connected together by a screw coupling G.
By screwing or unscrewing the coupling and by adjusting the pin L, of the
part H', in the slot L, the connecting rod can be lengthened or shortened and a
longer or shorter stroke can be given to the piston rod D and plunger B so as to
close or only partially close up the suction pipe A, at each downward stroke of the
plunger B. The connecting rod H, H¹, is pinned to the piston rod D, by the
pin N. The plunger B is of cylindrical shape, and may be formed of a central
spindle C, which is a continuation of the piston rod, with two collars R, S, on it.
The lower collar S may be screwed in place. Leather or other suitable packing
material is wound around the central spindle C, so as to form the body of the
plunger. The plunger and piston rod D, work in the brass or other metal tube E.
The tube E has, at its upper end, a screw cap F, and, at its lower end, it is fitted
into a casting, somewhat of the shape of a cross-piece O, or it may be a tee piece.
The cross-piece O and tube E form a sort of cylinder or casing for the plunger B
to work in. The suction tube A of the apparatus, is fitted into the side branches
of the cross-piece, O. The plunger may be lubricated by pouring a quantity of
vaseline into the tube E.
At the
When the shaft M, and wheel I, are revolved, the piston rod D and plunger B,
are reciprocated up and down in the tube E. At the downward stroke, the plunger B
is in the position shown at Fig. 2. In this position, the pipe A is completely closed,
so that the sucking action, from the vacuum machine, does not affect the teats or
teat-cups of the milking machine, so that they are free to expand.
upstroke, the plunger B is raised above the tube A, so that there is a free passage
throughout the length of the tube, and the vacuum, as a consequence, exerts its
full force on the teats or teat-cups of the milking machine, so that they are collapsed
At the next downstroke of the
or contracted and compress the cow's teat.
plunger B, the suction or vacuum is cut off, and the rubber teats, or teat-cups,
expand again, ready for another compression at the upstroke, and so on during the
operation of the apparatus. If the connecting rod G is shortened sufficiently, the
plunger B can be operated so as to only partially close the tube A, and, conse-
quently, only partially cut off the vacuum at each downstroke.
In this
Fig. 3 shows a simpler form of apparatus than that at Figs. 1 and 2.
case the piston or plunger B is operated by a wheel R and handle S. The shaft M
is in this case cranked at M¹ and has the connecting rod H, which may be made in
one piece, secured to it. The plunger works within the cylinder or casing T
which may be formed of a hollow tee shape, as shown, and which is bored out fo
its reception. T₁, T2 are branches to which the parts of the suction pipe A ar
connected. The operation of the device is the same as that at Figs. 1 and 2.
The apparatus may manifestly be altered in its details of construction withou
departing from the principle of the invention.

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. The use, in connection with milking machines, of a device for alternately
opening and cutting off the vacuum in order to produce an alternate pressure
and relaxation of the teats or teat-cups of the machine so that their action will
be similar to hand milking, substantially as hereinbefore set forth.
2. The combination with the vacuum or suction pipe (A) of a casing or
cylinder to which the pipe is connected and a plunger or piston working in said
casing or cylinder for the purpose of opening or cutting off the vacuum, sub-
stantially as hereinbefore described and shown on the drawings annexed.
3. The general arrangement and combination of parts of the pulsating
apparatuses, substantially as herein before described and shown at Figs. 1. 2 and 3
of the drawings annexed.
A vel 1 Couch 1000
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.