Improvements in Presses for Moulding Cement and similar Materials into Balls.
Year: 1890

page_text: Date of Application, 21st Mar., 1890-Accepted, 30th Aug., 1890
COMPLETE SPECIFICATION.
Improvements in Presses for Moulding Cement and similar Materials
into Balls.
I, ALBERT BAUERMEISTER, Manufacturer, of Aarau, Switzerland, do hereby declare
the nature of my invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:
The improvements hereinafter described are illustrated by the annexed drawings,
of which Fig. 1 is an end view, Fig. 2 a longitudinal section and parts of a front view,
Fig. 3 another longitudinal section and Fig. 4 a plan of a machine embodying my
invention.
The said ball-press comprises in its construction a pair of pulleys A which through
the pinion B set in motion the spur-wheel C; a pair of eccentrics or cams fixed
upon the axle c of the wheel C; stamps or pistons S and rotary moulds R. These
stamps S are raised and lowered by means of arms carrying friction rollers which,
sliding upon the periphery of the eccentrics f, are moved up and down by the latter.
A wheel Y mounted on the axle c has on one quarter of its circumference at r conical
teeth which periodically gear into and set in motion the conical pinion t which has a
square nave n. By this periodical motion, the conical pinion M, fixed upon the
saine shaft, turns the rotary mould R one division each time. The other three-quarters
of the circumference of the wheel Y are provided with a flat-ring K which during the
stand-still of the pinion slides on one of the faces of its square nave n, so as to hold it
fast and prevent the rotary mould R from moving. During this period of rest the
stamps S operated by the eccentrics f descend and compress the dry cement material
contained in the moulds of the wheels R which is placed below it, after which the
stamps move upwards and the wheels R are turned one division, that is the distance
between two moulds.
In moving downwards, the small piston y contained in the cavity of the pressing-
stamp S, is held back by the cross-lever a, until the complete hemisphere has been
formed at a.
If the pressure beneath the stamp continues to increase, the small stamp y
will be lifted and compress the spiral spring contained in the stamp S. When the
stamp S rises, the small stamp y remains at rest and expels the pressed body out of
the top mould. It therefore partly acts as a presser regulator and partly as an ejector
or expeller. The lever .c, when in its highest position, comes in contact with a catch a¹
and is thereby put down."
The moulds s are provided with movable expellers m, the guiding part of which has
an incision into which enters a flanged disc placed excentrically to the axis of the
mould-wheels R, and which serves to expel the ball from the mould, when the latter is in
its lowest position.
In order to fill the moulds s regularly with the same quantity of dry cement-powder
and at the same pressure, the feed screw L is employel, which at the top-end of its
spindle carries a cross-head G. The pins of this cross-head move up and down in
the slots of the socket-piece Z during its rotation. The purpose of this apparatus is
therefore, to effect a preparatory compression of the raw material and a regular filling
of the moulds.
To prevent the cement material from sticking to the sides of the moulds and of the
feed box, the walls of the latter, as well as those of the moulds, are heated by steami
or otherwise.
The low-pressure steam used for this purpose enters through the pipe 1, Fig. 2,
and is partly conducted through the horizontal branch pipe into the steam jackets
or chambers T, which are formed in the machine frame, and surround both the feed-
box containing the screw L, and the cylinder or sleeve which guides the stamp S,
Figs. 2 and 3. The water of condensation formed in the steam jacket is drawn off at

page_text: a suitable place by means of a cock. Another branch from the main tube f¹
conducts steam into an axial opening of the shaft carrying the mould wheel R, and
from the aperture the steam passes through a radial bore v into the hollow interior V
of the moulding discs R. After the steam has thus beated the walls of the moulds
it is conducted through an outlet (analogous to the inlet v) and discharged from the
mould-wheel shaft at . w is a stuffing box for making a steam-tight connection
between the branch pipe and the interior of the mould-wheel shaft.
89
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 :-
―
In a ball-press for preparing dry. raw material for cement and for analogous
purposes:
1. A wheel Y having a flat ring K and provided on a part of its circumference with
conical teeth, in combination with a conical pinion t having a square or polygonal
boss n.
2. The combination of a hollow main stamp S, with an auxiliary piston y, held back
by a. cross-lever x and influenced by a spring o, the said piston y being adapted to act
as a pressure-regulator and expeller.
3: The filling or feed-apparatus, comprising in its construction a feed-screw L,
provided at the upper end of its spindle with a cross-head G, the pins of which are
turned by a socket-piece.Z and adapted to move up, and down in the slots of the same.
Dated this 21st day of March 1890.
ALBERT BAUERMEISTER.
By Fairfax & Wetter,
433, Strand, London, Agents.