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Патент USA US3061293

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Oct. 30, 1962
A. MUCKEL ETAL
3,061,283
MIXING APPARATUS FOR CONCRETE OR THE LIKE
File'd Dec. 29, 1958
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United States Patent 0 ice
1
3,061,283
3,061,283
Patented Oct. 30, 1962
2
1
MIXING APPARATUS FOR CONCRETE
OR THE LIKE
Alfred Miickel, Neustadt an der Weinstrasse, and Her
mann Pfaif, Hassloch, Pfalz, Germany, assignors t0
space, with its drive shaft upright, drives the mixing in
struments, which prepare the materials to be mixed in
the cylindrical mixing chamber with the aid of a plate or
cup~shaped intermediate member which covers the center
space and to ‘the periphery of which the mixing instru
Internationale Baumasehinenfabrik Aktiengesellschaft,
ments are secured.
Neustadt an der Weinstrasse, Germany
Filed Dec. 29, 1958, Ser. No. 783,389
In another known embodiment, the inner space is occu
pied merely by a reversing gear having two bevel gears,
which produce a predetermined degree of speed reduction.
However, this is far from suf?cient to reduce the speeds
Claims priority, application Germany Jan. 9, 1958
3 Claims. (Cl. 259—178)
The present invention relates to mixing apparatus for
of the usual drives either of an electric motor or of an
use in the preparation and mixing of concrete or the like.
internal combustion engine to the speeds necessary for
the mixers concerned. Consequently a separate transmis
More in particular, the invention relates to mixing
apparatus in which the mixer components are operated
sion is required outside the confines of the mixer. 1
It is, therefore, an object of the invention to provide
within a vertically disposed cylindrical mixing chamber 15
a mixing device, especially for the preparation of con
and comprise a readily interchangeable driving gear driv
for converting the speed of the prime mover to the re
crete or the like, in which the above desiderata are taken
into account and which in particular offers a compromise
duced speed of the mixing elements and of the charging
of the best possible kind in regard to the individual opera
en from an external prime mover and reduction gear
hoist or discharging means associated with the mixer.
tions involving the con?icting requirements indicated.
Many forms of construction of apparatus for the mix
ing and preparation of, materials of different size of
mixing apparatus having vertically and centrally disposed
It is a particular object of the invention to provide a
driving gear which is readily accessible and interchange
able.
It is a further object of the invention to provide a mix
well known and these in turn are based on many different 25
granule and of different consistency, such as for example
those whichvare used for the preparation of concrete, are
operating principles.
The so-called hopper or barrel
ing apparatus which is compact in arrangement and size,
which can be driven by different prime movers and which
mixers and the so-called forced feed mixers are the most
is economical to construct and to operate.
important types of mixers in common use and, due to the
In accordance with the present invention a mixing de
pressure of the increasing requirements as to economy, the
30 vice constructed in a conventional manner as a forced
latter are coming more and more into prominence.
feed mixer with a vertically disposed cylindrical mixing
‘One embodiment of a forced feed mixer, wherein the
materials to be prepared are placed in an upright cylin
drical mixing chamber and are subjected therein to the
chamber in which the gear mechanism which is driven
by an external prime mover or power source and serves
to reduce the generally identical or approximately iden
operation of suitably constructed mixing devices may be
regarded as particularly advantageous. When, as is fre 35 tical speeds of the driving motors, is arranged to be
easily exchangeable in a central position in the middle
quently the case, such mixing apparatus is used in the
of the dead space of the mixer at a speed necessary for
preparation of concrete on building sites, it is generally
the mixing instruments and the feed hoist.
subjected to extremely severe operating conditions which
Preferably the driving gear comprises a worm gear
may frequently lead to the breakdown of the driving gear.
Stopping of the entire mixing apparatus may result in im 40 arranged on a vertical shaft, driven by the driving motor
by way of a worm, and at its upper part the vertical shaft
possible conditions in the progress ‘of the work of laying
the concrete, particularly on large building sites where it < drives the mixing devices through a planetary gear. At
its lower part the shaft directly drives a cable drum for
is necessary for very large quantities of concrete to be
the charging hoist which drum is provided with conven
prepared continuously and where a rather long break
down in the feeding of fresh concrete can lead to unde 45 tional clutch and braking means.
Further details and objects of the invention will become
sirable imperfections in the condition of the masonry of
the building under construction. ‘Consequently, in order" - apparent from the following speci?cation and by refer
ence to the accompanying drawings ‘which illustrate one
embodiment of the invention by way of example and
cially necessary in such work to select a driving mecha
nism which per se is robust but also, when it breaks down, 50 in which:
‘FIGURE 1 is a vertical section taken through a mixer
can be exchanged in an extremely short time.
_ to keep any breakdowns as short as possible, it is espe
Furthermore, most mixing devices require a charging
showing the drive arranged in accordance with the pres
ent invention,
hoist for the feed of material to the mixer and a building
FIGURE 2 is a horizontal section taken through the
winch or the like for the removal of the prepared con
55 planetary gearing of the drive,
crete mix from the mixer.
FIGURE 3 is a horizontal section taken through the
In constructing the driving gear it is important there
cable drum of the drive.
fore to bear in mind that the driving gear should also be
In the construction illustrated the mixing container of
capable of use in the simplest manner possible for operat
the forced mixer is constructed in conventional manner
ing the charging hoist or the like. Finally it is only nec
60 as an upright outer cylinder 1 and an inner ‘cylinder 1a,
essary to ensure that electric power is available on all
which cylinders are supported on a support plate 1b.
sites for feeding an electric motor which, per se, is the
In an annular cylindrical chamber 2, located between
most suitable driving means. In many cases the drive.
the inner cylinder 1a, which encloses a center space 5,
of the mixer must be obtained from other power sources
such as a diesel engine. In consequence care must be 65 and the wall of the cylinder 1, which is used for the
mixing operation, are located a number of arms 3 with
taken to ensure that the power source can be exchanged
very rapidly without any complications.
rotating, resiliently journalled staggered mixing devices 4.
operation is concerned. The mechanism located in this,
such manner as to be readily removable therefrom and
The arms 3 are secured to radially extending means 3a
In a particular known embodiment of the forced feed
secured to shaft 16 at the upper end thereof. The center
mixer, the entire drive is arranged in a cylindrical center
space 5 de?ned by inner cylinder 1a which in any case
space of the mixing chamber which may otherwise be 70 is useless as part of the mixing chamber is utilized to
regarded as dead and useless space as far as the mixing
accommodate driving gear 6 which is ?tted therein in
3,061,283
3
replaceable. The drive is obtained from any desired
external power source.
I
In the embodiment illustrated said source is constituted
by an electric motor 7 which drives the mechanism by
way of a shaft 8 connected at one end by a ?ange or other
coupling 9 to the electric motor and, at the other end,
by a ?ange or other coupling 1% to the driving gear. Any
gear wheels mounted on stationary shafts on said gear
support plate, means including a toothed crown opera
other desired source of power, such as a diesel engine
for example may, however, be used instead of the elec
tric motor 7.
tively connecting said gear wheels to said drive shaft and
10 a hollow shaft disposed around said drive shaft, said
hollow shaft having secured thereto a driving gear mesh
ing with said gear wheels and having a driven portion
The rotary speed of the shaft 8 is reduced by means of
a worm (not shown) and a worm wheel 11 in engage
ment therewith.
4
plate, radially extending means connected to the upper
end of said driven shaft and rotatable therewith and mix
ing devices operatively connected to said radially extend
ing means and extending downwardly therefrom to said
supporting plate for movement along a circular path,
a reduction gear for driving said driven shaft including
disposed below said gear support plate, and an external
Through the intermediary of a gear
source of power including drive means meshing with said
wheel 12 on a hollow shaft or sleeve 13, and planet
gear wheels i4 rotatably mounted on a stationary gear 15 driven portion, said drive shaft, said driving gear of said
hollow shaft, said gear Wheels and said toothed crown
support plate 14b, the worm wheel 11 drives a toothed
being supported as a driving unit in said center space
crown 15 of the planet gear which in turn is keyed on a
vertical, double take-off, centrally journalled drive shaft
above said support plate.
support plate.
When hollow shaft 13 rotates with gear
ber defined by a supporting plate and inner and outer
wheel 12 the planet gear wheels 14 are forced to rotate
and since they are in ?xed positions the toothed crown
and thereby shaft 16 are caused to be rotated about planet
plate, said inner wall enclosing a center space, a gear
2. A mixer for concrete or the like comprising, in
16. Planet gear wheels 14 are rotatably mounted on
shafts 14a. which are secured in ?xed position on the 20 combination, a vertically disposed annular mixing cham
generally cylindrical walls mounted on said supporting
support plate or the like mounted proximate the lower
wheels 14. The double take-off drive shaft 16, in addi 25 end of said inner wall, a double take-off drive shaft hav
ing an upper portion disposed in said center space cen
tion to driving the mixing tools, drives a cable drum 17
trally of said inner wall and a lower portion extending
which is mounted on the lower end of the shaft with
below said gear support plate, radially extending means
the interposition of suitable clutch and braking members
connected to the upper end of said driven shaft and ro
and is adapted to drive the charging hoist of the mixing
device or any other conveying apparatus, such as for the 30 tatable therewith and mixing devices operatively con
nected ‘to said radially extending means and extending
removal of the mixed concrete from the chamber. The
downwardly therefrom to said supporting plate for move
clutch and brake devices are operated by way of a man
ment along a circular path, a reduction gear for driving
ually displaceable lever 18.
said driven shaft including gear wheels mounted on sta
At its upper end the shaft 16 is connected to structure
tionary shafts on said gear support plate, means includ
including the arms 15 supporting the mixing devices 4,
ing a toothed crown operatively connecting said gear
and consequently the toothed crown 15 which is driven
wheels to said drive shaft and a hollow shaft disposed
by the speed reducing planet gear wheels 14, drives the
around said drive shaft, said hollow shaft having secured
shaft 16 and with it the arms 3 and mixing devices 4 atv
thereto a driving gear meshing with said gear wheels
reduced speed. It will be apparent that the speed at
and having a driven portion disposed below said gear
which the mixing devices 4 are driven is considerably
support plate, and an external source of power including
reduced with respect to the speed of drive shaft 8 because
drive means meshing with said driven portion, said drive
the speed is not only reduced by way of the worm wheel
shaft, said driving gear of said hollow shaft, said gear
11 but also by the planetary gear drive 12, 14, 15.
wheels and said toothed crown being supported as a
As may be seen, the entire driving unit may be dis
driving unit in said center space above said support plate
mantled in a very short time and replaced by an alter
native driving unit, so that if the driving gear breaks 45 and means connected to said lower portion of said drive
shaft for driving a hoist or the like at the reduced speed
down, which may happen very frequently when working
of said drive shaft, said toothed crown being in meshing
on sites under the aforementioned difficult conditions, the
engagement with the teeth of said gear wheels and keyed
time lost by breakdowns involving repairs and exchanges
may be reduced to a minimum.
to said drive shaft.
in addition the driving
gear mechanism of the present invention is suitable, with
50
,
3. A mixer for concrete or the like comprising, in
out the inter-position of any other means involving an
combination, a vertically disposed annular mixing cham
increase in the cost of the plant, for driving the charging
hoist of the mixing apparatus. Finally, in the entire
ber de?ned by a supporting plate and inner and outer
generally cylindrical walls mounted on said supporting
plate, said inner wall enclosing a center space, a gear
arrangement, care is taken to ensure that any desired
source of power may be used to drive the mixing appa 55 support plate or the like mounted proximate the lower
ratus. ‘In conclusion the driving gear mechanism also
simultaneously constitutes the support for the revolving
mixing devices, a feature which represents a further
simpli?cation and reduction in cost of the entire con
struction of the mixing apparatus.
Having now described our invention with reference to
the embodiment shown, we do not wish to be limited
thereto, but what we desire to protect by Letters Patent
of the United States of America is set forth in the
end of said inner wall, a double take-off drive shaft hav
ing an upper portion disposed in said center space cen
trally of said inner wall and a lower portion extending
below said gear support plate, radially extending means
60 connected to the upper end of said driven shaft and ro
tatable therewith and mixing devices operatively con
nected to said radially extending means and extending
downwardly therefrom to said supporting plate for move
ment along a circular path, a reduction gear for driving
65 said driven shaft including gear wheels mounted on sta
tionary shafts on said gear support plate, means includ
We claim:
ing a toothed crown operatively connecting said gear
1. A mixer for concrete or the like comprising, in com
wheels to said drive shaft and a hollow shaft disposed
bination, a vertically disposed annular mixing chamber
around said drive shaft, said hollow shaft having secured
de?ned by a supporting plate and inner and outer gen
erally cylindrical walls mounted on said supporting plate, 70 thereto a driving gear meshing with said gear wheels
and having a driven portion disposed below said gear
said inner wall enclosing a center space, a gear support
support plate, and an external source of power including
plate or the like mounted proximate the lower end of
drive means meshing with said driven portion, said drive
said inner wall, a drive shaft having an upper portion
appended claims.
shaft, said driving gear of said hollow shaft, said gear
disposed in said center space centrally of said inner wall
and a lower portion extending below said gear support 75 Wheels and said toothed crown being supported as a
3,061,283
driving unit in said center space above said support plate
and means connected to said lower portion of said drive
shaft for driving a ‘hoist or the like at the reduced speed
of said drive shaft, said ‘toothed crown being in meshing
engagement with the teeth of said gear wheels and keyed
to said drive shaft, said driven portion of said hollow
shaft being a worm wheel and said source of power
being disposed radially outwardly of said gear support
1,546,967
1,853,942
2,246,991
2,284,765
2,377,307
2,717,147
2,863,335
plate and having a worm gear meshing with said worm
wheel.
10
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,363,560
Browne ______________ __ Dec. 28, 1920
Buehler _____________ __ July 21, 1925
Sturtevant ___________ __ Apr. 12, 1932
Beardsley et al _________ __ June 24, 1941
Pierce ________________ __ June 2, 1942
Brown _______________ __ June 5, 1945
Fejmert ______________ __ Sept. 6, 1955
Miller _______________ __ Dec. 9, 1958
FOREIGN PATENTS
403,214
France ______________ __ May 21, 1909
1,014,75 6
France ______________ __ Mar. 17, 1950
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