Improvements in Machinery for Pressing Sand Faced Bricks.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Machinery for Pressing Sand Faced Bricks.
I WILLIAM JOHNSON of Castleton Foundry, Armley, Leeds in the County of York
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 :-
My Improvements refer :-
Firstly. To an arrangement of mechanism for avoiding the delay caused at present
by the necessity of having frequently to stop such machines for the purpose of
cleaning the mould from loose sand; and thereby to increase the output from the
machine. For this purpose I provide a series of moulds, arranged on a circular
table having an intermittent revolving motion, so that whilst one mould is under
the plunger of the pressing part of the machine, and the clay or brick is being fed
and the pressed brick is being removed from the adjacent moulds, the other moulds
are clear from the plunger and bricks or clay, and can be cleaned from the loose
sand, without any interruption to the continuous working of the machine.
Secondly. To the means or mechanism for giving an intermittent rotary motion to
the mould table. This I effect by connecting the table to a central vertical shaft,
rotated intermittently through mitre or bevel wheels from a second, shaft, which
second shaft is rotated intermittently from or by means of a pawl arrangement.
Thirdly. To the means or mechanism for opening and closing the moulds at the
proper periods. This effect by means of a circular-race, having a raised portion
over which run wheels or rollers having their axles connected by links to the hinged
sides of the moulds.
Fourthly. To the means or mechanism for locking the table in position during the
pressing operation. This consists in a bolt pressing against a horizontal race or
groove, of varying depth, round the edge of the table, with recesses opposite each
mould into which latter the bolt is shot by a spring, and is withdrawn therefrom,
when requisite, by a cam and lever arrangement.
Fifthly. To an arrangement of intermittent brake, which whilst allowing the table
to be free at starting, afterwards presses against the table in such a manner as to

page_text: j
Fig. 1 is a side elevation parallel to the line A B C in the plan Fig. 2; and
Fig. 3 is a back elevation of a machine for pressing sand face bricks, constructed in
accordance with my improvements.
The moulds a are arranged on a circular table 6, to which, a intermittent rotary
motion is imparted from the driving shaft c, by means of the connecting rod d with
pawl é attached thereto, working in gear with the ratchet wheel on the end of the
liorizontal shaft g, and the bevel wheels ; one of the bevel wheels being keyed on
the end of the shaft g, and the other on the lower end of the vertical axis of the
table b.
The moulds are provided with hinged sides and ends i, connected by side links
to the wheels or rollers k, which run on the fixed circular inclined race beneath
the table. It will be noticed that the highest part of the race is situated imme-
diately below the plunger m, and that the rollers kin ascending the incline of the race
gradually close the hinged sides and ends of the moulds, and in descending the
opposite incline again gradually open the aforesaid sides and ends of the moulds. In
order to hold the sides and ends i of the moulds securely locked during the pressing
operation, rollers are attached the plunger m, which when the plunger is at the
bottom of its stroke press against the upper edges of the sides and ends i of the
moulds, which edges are bevelled or tapered off for the purpose.
The table is securely locked during the pressing operation by means of the spring
.bolt 01 which by means of a spiral spring p is kept pressed against a horizontal race
or groove, (not shewn in the drawings), of varying depth, with recesses opposite each
mould into which recesses the bolt is shot by the springs p. The bolt o is withdrawn
at the proper moment by means of the rocking arm or lever 7, actuated by the face
cam S. To avoid the jerk caused by the sudden stoppage of the table by the spring
bolt 0, the spring 2 or a second spring for the purpose is arranged to press a brake
block, (not shewn in the drawings,) against the edge of the table immediately prior
to and during the time that the spring bolt o is being shot into the before mentioned
recesses in the table. The action of this spring against the brake inay be controlled
by the rocking arm and face cam s, or a separate lever and cam may be arranged
for the purpose.
In
i
The upper end of the connecting rod at ; is made elongated, so that the bush can
slide therein, and a strong spiral spring is inserted beneath the bush, so as to yield in
the event of excessive pressure thereby obviating the liability to breakage, Fig. 4.
By means of the set screw or bolt t, the bush may be lowered in the elongated end of
the connecting rod to adjust the compression of the spring, or packing pieces may be
inserted beneath the crank pin bush.

page_text: The elevation Fig. 1 shews only two of the moulds a. Similarly to avoid con-
plication, two moulds, only, diametrically opposite, are shewn in the back elevation
which presupposes an even, instead of an odd number of moulds as shewn in the plan
Fig. 2.
It will be evident that the arrangement of links j, rollers k, and inclined race l,
may be employed for automatically opening and closing moulds, in which the sides of
the moulds are moveable at right angles to their faces respectively; the vertical
movement of the links j being made to impart an horizontal movement to the sides of
such moulds by means of L levers.
Also the vertical motion of the connecting rod d; by means of an ☐ lever,
arranged to give a horizontal reciprocating motion to a horizontal rod, having a pawl
attached thereto, working into a ratchet disc mounted on the axis of the table; may
be caused to impart the intermittent rotary motion to the table a..
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 machines for pressing sand faced bricks :-
1° The arrangement on a circular table of moulds a, with hinged sides and ends i;
and the mechanism also consisting of links j, rollers k, and inclined race substan-
tially as and for the purposes herein set forth.
2º The mechanism consisting of the connecting rod d, pawl e, ratchet wheel and
bevel gear h, substantially as and for the purpose herein set forth.
3° Mechanism consisting of a connecting rod, Llever, horizontal pawl rod, and a
ratchet disc mounted on the axis of the mould table, substantially as and for the
purpose herein set forth.
The arrangement of spring bolt o, with lever q, and cams for controlling the
same, substantially as and for the purpose, herein set forth.
5° The rollers n attached to the plunger m for pressing against the upper (pre-
ferably bevelled) edges or sides of the hinged sides and ends i, of the moulds a,
substantially as and for the purpose herein set forth.
for obviating the
6° An intermittent spring brake, controlled by lever and cam,
shock caused by the locking of the table, substantially as herein set forth.
7° The employment of a spring at the upper part of the plunger connecting rod,
substantially as and for the purpose herein set forth.
8° The general arrangement and combinations of mechanism referred to in the
foregoing claims, forming my improved machine for pressing sand faced bricks,
substantially as herein set forth and shewn in the accompanying drawings..
Dated the ath de 01 Alarco
Dated the athl
Marco Too
J. CLARK JEFFERSON, Assoc. R.S.M., Wh. Sc.,
2, East Parade, Leeds,
Agent for Applicant.