IMPROVEMENTS IN MACHINERY FOR MIXING CONCRETE
Year: 1878

page_text: LETTERS PATENT to Joseph Day, of Green Bank, Hampstead, in the County
of Middlesex, and John Withey Lampard, of 17, Sydenham Terrace, Bath, in
the County of Somerset, for the Invention of "IMPROVEMENTS IN MACHINERY
FOR MIXING CONCRETE."
-
Sealed the 30th July 1878, and dated the 2nd February 1878.
PROVISIONAL SPECIFICATION left by the said Joseph Day and John
*Withey Lampard at the Office of the Commissioners of Patents on the 2nd
February 1878.
"
JOSEPH DAY, of Green Bank, Hampstead, in the County of Middlesex, and JOHN
WITHEY LAMPARD, of 17, Sydenham Terrace, Bath, in the County of Somerset.
IMPROVEMENTS IN MACHINERY FOR MIXING CONCRETE."
This Invention has for its object improvements in machinery for mixing
concrete.
The mixing takes place in a box made in four pieces exactly similar, which when
bolted together form a box like a cross; this box is entirely open at one end, and
is contracted to a round hole at the other. The open end has a circular cover, which
is capable of sliding on the shaft carrying the box.
-
The framing of the machine consists of two wood frames of a rectangular form;
the outside frame carries the whole machine either on wheels or otherwise. The
inner frame is made to oscillate for the purpose of emptying the box on trunnions,
whose bearings are on the outer frame.
The mixer or box is supported at one end by a shaft attached to a framework at
its open end, and working in a bearing on the inner frame. The other end works
on a series of rollers carried by the inner frame, and taking 2/,rds or more of the
circumference of the mixer, therefore giving it an easy, smooth action.
One of the trunnions carrying the inner frame is at one end driven in any suitable
manner, and at the other end has a bevil pinion, which gives motion to a bevil

page_text: wheel on the mixer, thus causing the mixer to rotate. The other trunnion is fixed
at one end to the inner frame, and at the other end is connected to a winch
handle, so that by turning the winch handle the mixer is inclined to any desired
extent.
A water tank is supported on the inner framing, and has a perforated iron pipe
passing from the tank through about 2/3rds of the length of the box, and there is a
valve in the tank for the purpose of admitting water at any desired rate to the
.box.
A hopper is also carried on the inner frame, and is of such a shape as to allow
the mixer to be fed with the material to be mixed, either direct or from a hopper
suspended from a small davit crane, which crane is fixed to the outside or stationary
frame, and so arranged as to swing round in a complete circle and plumb over the
hopper.
When working the machine the material is placed on a stage or platform, measured
or weighed in the proper proportions, and if the machine be used without the top
or swinging hopper the material is shovelled direct into the under hopper whilst
the machine revolves.
The water is admitted at pleasure, and the machine is allowed to revolve suffi-
ciently long to mix the concrete according to quality desired. When mixed the
sliding door is opened and the winch handle turned until the mixer is inclined
sufficiently to discharge the contents of the box, then the door is closed, the mixer
is placed level and re-charged.
The whole operation is performed whilst the mixer is in motion, therefore saving
at least one-half of the time taken. by most other mixers in stopping to fill and
empty.
The concrete is turned completely over four times in one revolution of the mixer,
and by the oscillating motion it is agitated still more in the opposite direction.

page_text: "
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Day and John Withey Lampard in the Great Seal Patent Office
on the 2nd August 1878.
JOSEPH DAY, of Green Bank, Hampstead, in the County of Middlesex, and JOHN
WITHEY LAMPARD, of 17, Sydenham Terrace, Bath, in the County of Somerset.
IMPROVEMENTS IN MACHINERY FOR MIXING CONCRETE."
This Invention has for its object improvements in machinery for mixing
concrete.
The mixing takes place in a box made in four pieces exactly similar, which when
bolted together form a box like a cross; this box is entirely open at one end, and is
contracted to a round hole at the other. The open end has a circular cover, which
is capable of sliding on the shaft carrying the box.
"
The framing of the machine consists of two wood frames of a rectangular form;
the outside frame carries the whole machine either on wheels or otherwise. The
inner frame is made to oscillate for the purpose of emptying the box on trunnions
whose bearings are on the outer frame.
The mixer or box is supported at one end by a shaft attached to a framework at
its open end, and working in a bearing on the inner frame. The other end works
on a series of rollers carried by the inner frame, and taking 2/rds or more of the
circumference of the mixer, therefore giving it an easy, smooth action.
:
One of the trunnions carrying the inner frame is at one end driven in any suitable
manner, and at the other end has a bevil pinion, which gives motion to a bevil
wheel on the mixer, thus causing the mixer to rotate. The other trunnion is fixed
at one end to the inner frame, and at the other end is connected to a winch
handle, so that by turning the winch handle the mixer is inclined to any desired
extent. .
A water tank is supported on the inner framing, and has a perforated iron pipe
passing from the tank through about 2/rds of the length of the box, and there is a
valve in the tank for the purpose of admitting water at any desired rate to the box.
A hopper is also carried on the inner frame, and is of such a shape as to allow the
mixer to be fed with the material to be mixed either direct or from a hopper
suspended from a small davit crane, which crane is fixed to the outside or stationary
frame, and so arranged as to swing round in a complete circle and plumb over the
hopper.
When working the machine the material is placed on a stage or platform,
measured or weighed in the proper proportions, and if the machine be used without
the top or swinging hopper the material is shovelled direct into the under hopper
whilst the machine revolves.
The water is admitted at pleasure, and the machine is allowed to revolve
sufficiently long to mix the concrete according to the quality desired. The mixing
box as the mixing progresses may also be rocked or oscillated on the trunnions to
ensure the perfect mixing of the materials. When mixed the sliding door is opened
and the winch handle turned until the mixer is inclined sufficiently to discharge
the contents of the box; then the door is closed, the mixer is placed level and re-
charged.
The whole operation is performed whilst the mixer is in motion, therefore saving
at least one-half of the time taken by most other mixers in stopping to fill and
empty.
The concrete is turned completely over four times in one revolution of the
mixer, and by the oscillating motion it is agitated still more in the opposite
direction.
In order that our Invention may be fully understood and readily carried into
effect, we have shewn in the Drawings hereunto annexed a concrete mixing machine
constructed according to our Invention..

page_text: Figure 1 is a side elevation, partly in section; of the machine; Figure 2 is an end
view partly in section; and Figure 3 a plan view of the same.
Detail views of some of the parts are shewn at Figures 4 and 5.
A is the mixer or box; the form of the cross section of this box is seen by the
dotted lines in Figure 2. In place of the box being composed of four equal parts,
as shewn, it might be, say, of three or five equal parts. B is a disc secured to one
end of the box, and resting on rollers C; D is the moveable door, capable of being
moved to and fro along the shaft E, which is secured to the box by cross pieces F,
as shewn at Figure 2; G is the inner frame, which carries the bearings of this shaft,
and also a curved frame H; upon which are mounted the friction rollers C; I, I, are
the trunnions, upon which the frame G can swing, and which are supported by the
outer frame K. One of the trunnions is made fast to the inner frame, and has upon
it a toothed wheel L, into which gears a pinion M, which can be turned by a crank
handle. On the axis of the pinion is also a ratchet wheel, which can be locked by
a pawl, as shewn at Figure 4, and by this means the inner frame can be locked at
any angle. N is a bevil wheel around the exterior of the box, and gearing with a
pinion O on a spindle P, which passes through the other trunnion, and carries belt
wheels Q for a driving strap to work over, as shewn at Figure 5. The box or
mixer can thus be revolved continuously without interfering with its being tilted
to, any desired angle to discharge its contents, or with its being rocked continuously
on its trunnions whilst the mixing is taking place. R is a lever handle for shifting
the end door D to and fro along the shaft E; S is a hopper, and T a water tank;
these are both carried by the inner frame G.
The hopper S delivers all materials thrown into it into the box or mixer through
the circular opening at the centre of the end disc B. T' is a moveable swinging
hopper, and T2 a crane post and arm, by which it may be carried; these parts are
indicated by dotted lines in Figure 1. The moveable hopper can thus be swung
out of the way of the fixed hopper whenever desired in the direction shewn by the
dotted line V, Figure 3. W is a pipe leading from the tank to the interior of the
mixer; X is a valve and lever for raising the same to control the admission of water
from the tank to the mixer; Y, Y, are wheels, upon which the outer frame K may
be mounted.
The action of the apparatus is clearly stated above, so that it is unnecessary to
give any further description of it.
In place of the box or mixer being mounted concentrically around the axial line
upon which it revolves, it may if desired be hung diagonally, so that at the same
time that it is revolved it necessarily receives a rocking motion also.
Having thus described the nature of our Invention, and the manner of performing
the same, we would have it understood that we claim,-
First. The combined arrangement of machinery for mixing concrete, substantially
as herein-before described.
Second. The combined arrangement, substantially as herein-before described and
illustrated in the Drawing annexed, whereby the mixing box can be revolved and
at the same time tilted to and fro to any desired angle.
Third. The construction of the mixing box, substantially as herein-before
described.
In witness whereof, we, the said Joseph Day and John Withey Lampard, have.
hereunto set our hands and seals, this Thirtieth day of July, in the year
of our Lord One thousand eight hundred and seventy-eight.