Year: 1887

page_text: Date of Application, 6th June, 1887.
Specification Accepted, 13th Sept., 1887.
[Communicated from abroad by WILLIAM TUNSTILL, of the City of Brooklyn, in the
County of Kings and State of New York, United States of America.]
I, ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E. 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 relates to Ice-Cream Freezers, and consists in novel devices for
holding and revolving the freezing cylinder within the ice-box, in such a manner that
access is given for easily opening or closing the removable-head, so that the said
cylinder can remain within the said ice-box, in order that no time be lost in filling
the freezer or in discharging the frozen cream.
This invention is an improvement upon that for which U.S. Letters Patent were
granted to my correspondent Oct. 21, 1884, No. 307,075. In that patent the holder
for the cream occupies an horizontal position and the stirrers or beaters rotated in one
direction and the cylinder in the opposite direction, by bevel gearing, but as the
gearing is in front of the removable head, difficulty has been experienced in emptying
the cream from the freezer without the same becoming soiled or injured by particles
of oil or dirt in the gearing.
The object of this invention is to facilitate the introduction and removal of the
cream from the horizontal cylinder, by placing the driving gearing at the back end of
the cylinder, so that access is given for easily opening or closing the removable head,
and the cylinder itself can remain within the ice-box so that no time is lost in filling
the freezer or in discharging the frozen cream.
In the drawing Fig. 1 is a vertical section of the freezer complete, the beaters or
stirrers being in elevation. Fig. 2 is a plan with part of the cylinder broken open.
Fig. 3 is an elevation of the end of the cylinder and the head, and Fig. 4 is a section
through the stirrer and an elevation of the end of the driving shaft.
The ice-box A is of any desired size and it has a stationary head B at one end, and
a head L at the other end in which is a somicircular opening that receives the ring K

page_text: upon the cylinder H of the freezer, and there is a movable gate L' with a semicircular
opening in the under part so that the two parts will close around the ring K of the
cylinder, to retain the ice within the box A and around the cylinder H. These parts
are similar to those shown in the aforesaid patent, except that the head B is perforated
for the passage of the tubular shaft 2 at the back end of the cylinder H, and this
tubular shaft 2 rests in a bearing 3, that is fastened to the back head B of the ice-box,
and it is preferable to make this back head in two parts, the upper part being
movable so that it can be slipped down into place, after the cylinder H and its shaft 2
have been placed in the ice-box.
The cylinder H may be tapering as in the aforesaid patent, but I have shown it in
Figs. 1 & 2 of the same diameter throughout. The ring K is soldered fast to the
cylinder H, and the movable head N is circular and provided with a washer at 5 and
the cross-bar P is entered at its ends beneath the loops 6 upon said ring K, after the
head has been put in place and then the clamp-screw 7 is turned to fasten the head
tightly to the end of the cylinder, the washer 5 rendering the parts water-tight, and
when the cylinder is to be opened, the screw 7 is loosened, the cross bar P slipped
out from the loop 6 and then the head can be taken off for removing the contents of
the cylinder.
One peculiarity of the present invention relates to the screw-plug 9 that is inserted
into a hole in the head N, so that by removing this screw-plug and turning the
cylinder, so that the opening for such screw-plug, is in the upper part of the head,
the milk, cream, or other materials to be beaten or frozen can be poured into the
cylinder H while such cylinder remains in a horizontal position, there being a funnel
with a bent or horizontal delivery tube shown by dotted lines in Fig. 1, applied at
the opening so that such materials run freely into the cylinder while the head remains
firmly clamped to close the end of such cylinder and after such materials have been
introduced and the funnel removed, the screw-plug is inserted to close the hole in
the head.
Upon this tubular axis 2 of the cylinder H is a gear-wheel 10, and through the
tubular axis is the shaft 11 upon which is the bevel gear wheel 12, and the
intermediate bevel gear-wheel 13 is upon a shaft 14 that is supported by a bracket 15
screwed upon the head B of the ice-box, and a crank 16 is applied either to the end
of the shaft 14 or to the end of the shaft 11 so that by turning this crank the shaft 11
will be rotated in one direction and the tubular shaft 2 and cylinder H will be
rotated in the other direction through the intervention of the bevel or mitre
gearing.
The beaters or stirrers within the freezer are to be of any desired character but it
is preferable to make use of the compound beater reprosented in which the shaft 18 is
provided with a square 19 at one end that enters a polygonal recess in the center of
the head N and the other end 20 of said shaft 18 is reduced in size and enters a
socket, in the end of the shaft 11, and there are rows of fingers 22 and 23 projecting
laterally at opposite sides of the shaft 18 and these fingers are preferably in the form
of narrow plates or blades, placed diagonally as seen in Fig. 2. It will now be
apparent that the shaft 18 revolves with the cylinder H in consequence of the
square 19 entering a corresponding recess in the head N said head being clamped to
and revolving with the cylinder, but the shaft 11 with the socket that receives the
end 20 of the shaft 18 is revolving in the opposite direction, and this shaft 11 is made
use of to give motion to the frame of scrapers or beaters composed of the bearings 25,
26, 27, and the longitudinal bars 28 and 29, the bearings 25, 26 and 27 being
supported by but revolving around the shaft 18 in the opposite direction and to
connect the shaft 11 with this frame, at the end of said shaft 11 is provided a disc 30
with lugs 31 projecting from its face as seen in Fig. 4, which lugs come in contact
with the bearings 25 and thereby revolve the same and the other parts 29, 26, 28
and 27 that are connected with the said bearing 25 and from the bars 28 and 29
there are inwardly projecting fingers or stirrers 35 that pass between the fingers 22
& 23 respectively as the parts are revolved in the opposite directions as aforesaid,
thus thoroughly mixing up or stirring the contents of the cylinder H, and in order

page_text: to scrape the frozen cream from the interior of the cylinder H the slats 36 and 37
are applied upon the bars 28 and 29 respectively, there being screws at 40 passing
through slots and holding the slats in place upon the bars and springs 41 to press the
slats outwardly and cause their edges to scrape the interior surface of the cylinder H.
Yielding slats have been used upon ice-cream freezers and these scrapers may be
of any desired character.
It will now be apparent that the cracked ice and salt that are packed into the
box A and around the cylinder H do not interfere with the revolution of the said
cylinder, and all the driving mechanism is at the back end of the cylinder and does
not interfere with the opening or closing of the cylinder head and there is nothing
to soil the cream and the beaters or stirrers and the shaft IS can be easily taken
out for removing the cream from the surface of the same or replaced and connected
to the head by the square as before mentioned.
The rim of the ring K projects sufficiently beyond the end of the ice-box for
the cream to be drawn out into a holder or suitable vessel placed beneath such rim,
but as an additional precaution and to aid in rapidly discharging the cream in the
rim of the ring K are formed the deep segmental grooves 45 and introduce into
the segmental groove which is at the bottom when the cylinder head is opened, a
segmental strip of metal 46 forming a discharge lip and projects any desired distance
and down which the frozen cream or other material flows or is drawn by a spoon as
it is delivered from the cylinder H.
It is preferable to connect upon this lip-piece 46 hooks 47 to hook over the
studs 48 upon the outer edges of the ring K so as to hold such delivery lip in
place and in large freezers it is preferable to hinge upon the delivery-lip 46, a
swinging spout 50 that may be inclined more or less and placed with its lower end
into the vessel that receives the frozen cream or other material.
I have shown in the drawing a machine that is adapted to be driven by hand
power, but with large machines that are driven by steam power it is preferable to
employ an iron frame with legs for supporting the ice-box, and with a shaft and
driving pulley for a belt to give the necessary power for rotating the gearing and the
respective shafts.
Having now particularly described and ascertained the nature of the said Invention,
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :-
1. The combination in an ice-cream freezer, of a box to hold the ice, a hollow
cylinder having one open end which projects through one end of the ice-box and is
provided with a removable head and a clamping device to secure said head, with
à tubular shaft connected to the other end of the cylinder, and projecting through the
back end of the ice-box, and another shaft within the tubular shaft extending into the
said hollow cylinder, a stirrer within the hollow cylinder, connected with the said
inner shaft, and means substantially as specified for rotating the respective parts
substantially as and for the purpose set forth.
2. The combination in an ice-cream freezer of a cylinder having one end open, and
the other end closed, the open end of such cylinder being provided with a removable
head, cross-bar and clamping-screw, and an ice-box through the end of which the
open end of such cylinder projects, with a shaft rigidly attached to the closed
end of such cylinder, and a bearing through which such shaft projects, to
receive the power for revolving such cylinder, substantially as and for the purpose
set forth.
3. In an ice-cream freezer, the combination with an horizontal revolving hollow
cylinder, having a removable head, with an orifice therein, through which material
to be cooled or frozen may be introduced into said cylinder, while said removable
head is on said cylinder and said cylinder is in an horizontal position, of a plug
by which the said prifice may be closed to prevent the escape of the contained
material, while said cylinder is in revolution, substantially as and for the purpose
set forth.
.

page_text: 4. In an ice-cream freezer, the combination of the cylinder H, and its contained
mechanism namely, shaft 18, beaters or stirrers 22, 23, bars 26, 28, 29, screws 40,
and springs 41, with the movable head N, bar P, loops 6, screw 7, screw plug 9, an
orifice for the reception of said plug, disc 30, shaft 2, the bearings 3, shaft 11,
wheels 10, 12, 13, an ice-box surrounding said cylinder, ring K, and washer 5, and
means substantially as specified for rotating said cylinder, and actuating its
accompanying mechanism substantially as and for the purpose set forth.
Datad this béh day of Luna 1987