IMPROVEMENTS IN STONE-BREAKING MACHINERY
Year: 1878

page_text: LETTERS PATENT to William Lester, of Minera, near Wrexham, in the
County of Denbigh, for the Invention of "IMPROVEMENTS IN STONE-BREAKING
MACHINERY."
Sealed the 29th November 1878, and dated the 4th June 1878.
PROVISIONAL SPECIFICATION left by the said William Lester at the Office
of the Commissioners of Patents on the 4th June 1878.
WILLIAM LESTER, of Minera, near Wrexham, in the County of Denbigh. "Iм-
PROVEMENTS IN STONE-BREAKING MACHINERY."
This Invention relates to improvements in that class of machinery for breaking
stone in which the stone to be broken is fed into or between two jaws or crushing
surfaces placed at an angle to each other, one of such jaws being moved to and fro,
and the other fixed; and one part of my improvements consists in an improved
method of giving motion to the moveable jaw, and also in constructing the fixed
jaw so that it can be reversed end for end and face for face, and its position adjusted
as required.
For this purpose, in carrying out my improvements, I suspend the moveable jaw
upon an axis supported by the side framing of the machine. At the back, near the
lower end of the moveable jaw, an axis is supported, and revolves in suitable
bearings, and on the centre of the axis an eccentric is mounted, which in its revo-
lution acts against the back of the jaw to force it towards the fixed jaw, and thus
crush and break the stone between them in the usual manner.
The moveable jaw is drawn back by a spring or otherwise.
The fixed jaw is so formed in one solid piece that it can be reversed end for end
in order to equalize the wear upon the wearing surface from time to time, as may
be required.
L
S the fivad lave man also be vavarrod

page_text: This method of adjustment enables the otherwise fixed jaw to be removed,
reversed, and changed with the greatest ease; and the jaw is so made as to work
with the one face as a road stone breaker, and with the other as a crushing jaw; it
has also the additional advantage of working with either end, thus giving in one
piece the equivalent of four fixed jaws.
The usual revolving screen is substituted by a simple arrangement in attaching a
moveable screen to the jaw, which gives it a riddling motion, enabling the dust to
be taken out most effectually.
The moveable screen and trough can be used or not as desired.
The position or angle of the fixed jaw in relation to the moveable jaw may be
adjusted as required by means of a bar, which can be slid through openings in the
side frames of the machine, so that the lower end of the jaw rests against the back
of the bar, the width of which can be varied to suit the angle at which the jaw is
to be placed.
The advantages of this improved construction of stone breaker are, cheapness of
production in consequence of the less weight of metal required; extra strength in
the working parts, and the simple and easy method of changing or renewing them;
its compactness and portableness; the extra power gained by the direct action of an
eccentric at the point most required for crushing by the moveable jaw; the sim-
plicity and strength of the regulating or adjusting arrangement by means of a
removeable bar, which opens or closes the otherwise fixed jaw; the complete and
powerful direct eccentric crushing action without any complicated joints, pins,
screws, toggles, or adjusting wedges, the eccentric shaft bearings only requiring hard
metal or brass.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Lester in the Great Seal Patent Office on the 3rd December
1878.
WILLIAM LESTER, of Minera, near Wrexham, in the County of Denbigh. "IM-
PROVEMENTS IN STONE-BREAKING MACHINERY."
This Invention relates to improvements in that class of machinery for breaking
stone in which the stone to be broken is fed into or between two jaws or crushing
surfaces placed at an angle to each other, one of such jaws being moved to and fro,
and the other, fixed; and one part of my improvements consists in an improved
method of giving motion to the movable jaw and to the movable screen attached
thereto, and also in constructing the fixed jaw so that it can be reversed end for end
and face for face, and its position adjusted as required.
And in order that my Invention may be clearly understood and readily carried
into practice, I will proceed to describe the Drawings hereto annexed.
Figure 1 shows a longitudinal section, and Figure 2 a plan of a stone-breaking
machine arranged and constructed in accordance with my improvements.
Figure 3 shows one side of the frame.
Figure 4 is a section, and Figure 5 shows the working face of the movable jaw.
Figure 6 is a section, and Figure 7 a plan of the fixed jaw.
Figure 8 shows the driving axis and eccentric.
And Figures 9 and 10 show separate views of the connecting rod and collars.
In carrying out my improvements I suspend the movable jaw a upon an axis a'
supported by the side framing of the machine. At the back, near the lower end of
the movable jaw a, the axis b is supported and revolves in suitable bearings in the
side frames, and having fly wheels b' and driving pulley be mounted thereon. On
the central part of the axis b an eccentric is mounted or formed, which in its revo-
lution imparts a to-and-fro motion to the movable jaw a either by direct action on
the back of the jaw or by means of the connecting rod c connected to the back of
the jaw a to force it towards the fixed jaw d, and thus crush and break the stone
between them in the usual manner.
The fixed jaw d is formed in one solid piece, with a circular opening at each end,
by one of which it is suspended on the bar d¹, supported in bearings on the side
frames, as shown, so that it can be reversed end for end and face for face in order
to equalize the wear upon the wearing surfaces from time to time, as may be
required.
The working faces of the movable jaw, which may be in two parts, can also be
reversed by being arranged to slide in dovetailed grooves, as shown, or in any other
convenient manner.
This method of adjustment enables the otherwise fixed jaw d to be removed,
reversed, and changed with the greatest ease; and the jaw is so made as to work
with the one face as a road stone breaker, and with the other as a crushing jaw;
it has also the additional advantage of working with either, and thus giving in one
piece the equivalent of four fixed jaws.
The position or angle of the fixed jaw d in relation to the movable jaw a may be
adjusted as required by means of a bar d, which can be slid through openings d³ in
the side frames of the machines, so that the lower end of the jaw rests against the
back of the bar, the width of which can be varied to suit the angle at which the
jaw is to be placed; d is an adjusting screw to set the jaw d at any required
angle; or the position of the jaw d may be adjusted by means of screws in the back
of the frame.
The usual revolving screen is substituted by a simple arrangement in attaching a

page_text: movable screen e to the lower end of the movable jaw a, which gives it a riddling
motion, enabling the dust to be taken out most effectually.
The movable trough and screen can be used or not as desired.
The advantages of this improved construction of stone breaker are, cheapness of
production in consequence of the less weight of metal required; extra strength in
the working parts, and the simple and easy method of changing or renewing them ;
its compactness and portableness; the simplicity and strength of regulating or
adjusting arrangement by means of a removable bar d², which opens or closes the
otherwise fixed jaw d; the complete and powerful direct eccentric crushing action
without any complicated joints, pins, screws, toggles, or adjusting wedges, the
eccentric shaft bearings only requiring hard metal or brass.
Having thus described the nature of my improvements, and the manner of per-
forming or carrying the same into practice, I would remark that I do not limit
myself to the exact mechanical details herein-before described so long as the main
features of my Invention are retained, as, for instance, the reversible fixed jaw d
may be applied to stone-breaking machines of different construction; neither do I
claim any of the parts separately which are well known and in common use; but
what I claim is,―
First. The improved method of arranging, constructing, and giving motion to
the movable jaw a by means of an eccentric forming part of or being mounted upon
the driving axis 6 of a stone-breaking machine, substantially in the manner herein-
before described.
Secondly. I claim the improved method of forming, mounting, and adjusting the
fixed jaw d with reversible wearing surfaces, substantially in the manner herein-
before described, and represented in the Drawings annexed.
Thirdly. I claim the improved arrangement, application, and method of actuating
the screen e by means of the movable jaw a, substantially as herein-before described,
and represented in the Drawings annexed.
Fourthly. I claim the improved general arrangement and combination of
mechanism for breaking stone, constructed and arranged to act substantially in
the manner and for the purpose herein-before described, and represented in the
Drawings annexed.
In witness whereof, I, the said William Lester, have hereunto set my hand
and seal, this Thirtieth day of November, in the year of our Lord Ono
thousand eight hundred and seventy-eight
WILLIAM LESTER. (L.S.)