Improvements in Machines for Pressing Bricks and Tiles and the like.
Year: 1894

page_text: Date of Application, 21st Aug., 1894
Complete Specification Left, 21st May, 1895-Accepted, 22nd June, 1895
PROVISIONAL SPECIFICATION.
Improvements in Machines for Pressing Bricks and Tiles and
the like.
We, JOHN CRAVEN and BENJAMIN CRAVEN both of Westgate Common
Foundry Wakefield, in the County of York Engineers do hereby declare the
nature of our invention to be as follows:-
Our invention has for its object to provide machines for pressing bricks and tiles
and the like with means for automatically stopping the machine after each pressing
action and to start the machine again after the pressed brick tile or the like has
been removed from the mould and a fresh brick, tile or the like has been placed in
position in the mould to be pressed.
According to our invention we provide on the second motion shaft which operates
the plunger for pressing the bricks or tiles a cam or inclined surface which may be
mounted on the said second motion shaft direct, or it may be fixed on the toothed
wheel which is fast on the said shaft and gears with a pinion on the first motion
shaft. This cam or iuclined surface is situated so as to act on one end of a bar fitted
to slide in suitable guides which bar operates the strap fork for shifting the driving
strap from the fast to the loose pulley and vice versa. The said cam or inclined
surface may be adjustable in position circumferentially with reference to the device
which operates the plunger as the said inclined surface or cam should act on the
sliding bar to shift the driving strap from the fast pulley onto the loose pulley
about the time that the plunger after pressing a brick or tile has been raised clear
above the mould the said driving strap being then (by a parallel portion of the cam
surface) retained on the loose pulley during the time that the pressed brick tile or
the like is being expelled from the mould and another brick tile or the like is being
placed therein after which the cam surface leaves the sliding bar which then under
the action of a spring or weight is caused to slide and shift the driving strap onto
the fast pulley and so start the machine. To prevent the momentum of the wheel,
which carries the cam surface or the cam surface itself from acting so as to cause a
descent of the plunger after the driving strap has been shifted onto the loose pulley
a counter weight (preferably adjustable) is provided which will overcome this
momentum and cause the plunger to be retained in its highest position.
The machine may be arranged to act so that it does not start automatically but is
started by hand. This can be done by removing the weight from the lever or by
providing a catch which retains the lever in position when the machine has been
stopped the machine not starting again until the lever is released or operated by
hand.
Dated the 21st day of August 1694.
094.
JOHNSONS & WILLCOX.
47 Linccln's Inn Fields, W.C., Agents.

page_text: Improvements in Machines for Pressing Bricks and Tiles and
the like.
We JOHN CRAVEN and BENJAMIN CRAVEN both of Westgate Common
Foundry Wakefield in the County of York Engineers 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 :-
Our invention has for its object to provide machines for pressing bricks and tiles
and the like with means for automatically stopping the machine after each pressing
action and to start the machine again after the pressed brick tile or the like has
been removed from the mould and a fresh brick, tile, or the like has been placed in
position in the mould to be pressed.
According to our invention we provide on the second motion shaft which operates
the plunger for pressing the bricks or tiles a cam or inclined surface which may be
mounted on the said second motion shaft direct, or. it may be fixed on the toothed
wheel which is fast on the said shaft and gears with a pinion on the first motion
shaft. This cam or inclined surface is situated so as to act on one end of a bar
fitted to slide in suitable guides which bar operates the strap fork for shifting the
driving strap from the fast to the loose pulley and vice versa. The said cam or
inclined surface may be adjustable in position circumferentially with reference to
the device which operates the plunger as the said incliued surface or cam should
act on the sliding bar to shift the driving strap from the fast pulley onto the loose
pulley about the time that the plunger after pressing a brick or tile has been raised
clear above the mould the said driving strap being then (by a parallel portion of
the cam surface) retained on the loose pulley during the time that the pressed brick
tile or the like is being expelled from the mould and another brick tile or the like
is being placed therein after which the cam surface leaves the sliding bar which
then under the action of a spring or weight is caused to slide and shift the driving
strap onto the fast pulley and so start the machine. To prevent the momentum of
the wheel, which carries the cam surface or the cam surface itself from acting so as
to cause a descent of the plunger after the driving strap has been shifted onto the
loose pulley a counter weight (preferably adjustable) is provided which will
overcome this momentum and cause the plunger to be retained in its highest
position.
The machine may be arranged to act so that it does not start automatically but
is started by hand. This can be done by removing the weight from the lever or
by providing a catch which retains the lever in position when the machine has been
stopped the machine not starting again until the lever is released or operated by
hand.
We will further describe our invention with reference to the accompanying
drawing Figures 1 and 2 of which represent views at right angles to each other, a
machine constructed according to our invention for pressing bricks tiles or the like.
A are standards having fixed thereto a mould B in which the bricks tiles or the
like are pressed by a plunger or piston C carried on a crosshead C2 fitted to
slide up and down in guides D the up and down motions being given to the
said crosshead by an eccentric E on the shaft F and a rod F⁹. The
shaft F receives rotation from the driving shaft G by means of an internal toothed
wheel H thereon gearing with a pinion I fast on the said shaft G. The shaft G
carries a fast pulley K and a loose pulley L and is driven by a strap M from any
suitable motive power engine. N is a strap fork carried on a bar N' fitted to
slide horizontally in bearings on the standards A and operated in the manner
hereinafter described to shift the strap M onto either pulley K or L as required.

page_text: On the internal toothed wheel H is fitted a cam or inclined projection P which at
each revolution of the wheel H is brought into position to act on the bar N2 of the
strap fork so that if the driving strap be on the fast pulley K the bar N2 will be
moved longitudinally by the said cam surface so as to shift the strap from the said
pulley onto the loose pulley L and thus stop the machine. The cam or inclined.
projection P instead of being carried on the wheel H may be carried by an arm or
disc secured to the shaft F independently of the said wheel H and may be adjustable
circumferentially with reference to the eccentric E so as to cause it to act on the
bar N to stop the machine when the plunger is in the required position clear above
the mould B. When by the inclined portion P of the cam surface the bar N has
been moved so as to shift the driving strap on to the loose pulley the end of the
bar N rests on the parallel portion P2 of the cam the said parallel portion being
sufficiently long to retain the strap on the loose pulley during the time a pressed
brick tile or the like is being expelled from the mould and another brick tile
or the like is being placed in the mould to be pressed, after which the parallel
portion of the cam leaves the bar N' which may then be moved longitudinally
by means of a cranked lever R centred at r to one of the standards A,
the arm R of the said cranked lever being connected by a pin and slot connection r²
to the bar N2 so that by depressing the arm R of the lever the driving strap may
be shifted on to the fast pulley to start the machine. Or the strap shifter may be
automatically operated to start the machine when the parallel portion of the cam
surface leaves the bar N2 by a spring acting on the bar N2 by providing on the
arm R of the lever a weight S as shewn the said weight being sufficiently heavy
to give to the bar N³ the necessary motion to shift the strap. To prevent the
momentum of the wheel carrying the cam surface or the cam itself when mounted
separately on the shaft F from actuating the plunger or piston C as to cause it to
descend after the driving strap has been shifted on to the loose pulley, a counter-
weight T is provided on the wheel H or on the shaft F or otherwise arranged so
as to retain the plunger in its highest position until the driving strap is shifted
onto the fast pulley.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In a machine for pressing bricks, tiles and the like the combination with a
mould to contain the articles to be pressed and a piston or plunger for pressing the
articles in the mould means for automatically arresting the motion of the piston
or plunger after pressing an article in the mould and when the said piston or
plunger is clear of the mould substantially as herein before described.
2. In a machine for pressing bricks tiles and the like the combination with a
mould to contain an article to be pressed a piston or plunger by which the article
in the mould is pressed operated by means of a crank or eccentric driven from a shaft
carrying fast and loose pulleys round which passes a driving strap: and a strap fork
by means of which the driving strap may be shifted from one pulley on to the other
pulley of a cam or cam surface arranged to operate automatically on the strap
fork to shift the driving strap from the fast pulley onto the loose pulley at about
the time when the piston or plunger after pressing a brick, tile or the like in the
mould has been raised clear above the mould substantially as hereinbefore
described.
3. In a machine for pressing bricks tiles and the like the combination with a
mould in which the article to be pressed is placed, a piston or plunger by which the
article in the mould is pressed, operated by a crank ur eccentric driven from a
shaft carrying fast and loose pulleys round which passes a driving strap, a strap
fork for shifting the driving strap from one pulley on to the other pulley, a cam or
cum surface arranged to operate automatically on the strap shifter to shift the
driving strap from the fast pulley on to the loose pulley at about the time when
the piston or plunger has been raised clear above the mould and a counter-weight

page_text: to prevent the momentum of the cam or of the wheel which carries the cam from
acting so as to cause a descent of the piston or plunger after the driving strap
has been shifted on to the loose pulley, substantially as hereinbefore described.
4. In a machine for pressing bricks tiles and the like the combination with a
mould in which articles to be pressed are placed, a piston or plunger, by which
the articles are pressed in the mould, operated by means of an eccentric or its
equivalent from a shaft carrying fast and loose pulleya round which passes a
driving strap, and a strap shifter for shifting the driving strap from the loose
pulley on to the fast pulley and vice versa, of a rotating cam or cam surface
arranged to act on the strap shifter to automatically shift the driving strap on to
the loose pulley at about the time when the piston or plunger has been raised
clear above the mould and to retain the driving strap on the loose pulley during
the time that the pressed brick, tile or the like is being expelled from the mould
and another brick tile or the like to be pressed is being placed in the mould, and
a weighted lever or its equivalent acting on the strap shifter so as to automatically
shift the driving strap from the loose pulley on to the fast pulley after the cam
ceases to act on the strap shifter substantially as hereinbefore described.
5. The combination and arrangement of parts constituting the machine for
pressing bricks tiles and the like substantially as hereinbefore described and
illustrated by the accompanying drawings.
Dated this 21st day of May 1895.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.