Improvements in Mixing Drums.
Year: 1896

page_text: Date of Application, 23rd Dec., 1896-Accepted, 3rd Apr., 1897
COMPLETE SPECIFICATION.
Improvements in Mixing Drums.
We, ERNST GAUHE, OTTO GAURE and CARL GOCKEL, Proprietors of the
Firm of Maschinenfabrik Rhein und Lahn Gauhe, Gockel & Co., Manufacturers
of Oberlahnstein on the Rhine, in the Empire of Germany do hereby declare the
nature of our invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
The present invention relates to mixing drums for all kinds of material and more
especially to drums for mixing mortar, concrete and the like and the invention
consists of the particular construction of the said drum with regard to the means
for filling and emptying the same, to an automatic device for removing and fastening
the cover and to the particular arrangement of stirrer blades within the drum as
hereinafter more particularly set forth and pointed out in the claims.
And in order to render the present specification more easily intelligible reference
is had to the accompanying drawings in which similar letters of reference denote
similar parts throughout the several views :-
Fig. 1 is a front elevation of the drum,
Fig. 2 a side elevation,
Fig. 3 a front elevation of the drum detached showing the lever device for
fastening and releasing the cover,
Fig. 4 detached side elevation of the drum scen from the right hand side of
Figure 3,
Fig. 5 a similar elevation to Figure 4 showing the cover removed and the
pawl for actuating the cover bow thrown forward into the path of the said
cover bow and about to be disengaged when it is desired to again close the drum.
Fig. 6 is a similar elevation showing the disengaging pawl about to be thrown
back out of the cover securing bow after the cover has been closed, and
Fig. 7 is an elevation on a reduced scale of means for driving the drum.
The drum b is mounted in the frame A at one side on a hollow trunnion supported
in a ring a running on rolls C C, and at the other side in the bearing B on
its trunnion a, which carries a gear D (Fig. 7) engaged by a pinion E driven by a
pulley F in any suitable manner. The mouth G of a feed hopper G extends
through the hollow trunnion of the drum so that material may be fed to the drum
whilst the same is rotating. The drum is further provided with an outlet opening c
covered by means of a spring cover d over which a bow a loosely mounted on the
drum trunnions, grips and retains the cover in position over the outlet owing to the
elasticity of the said cover.
Within the drum are arranged sets of stirrer blades H set at an angle to the
direction of rotation of the drum as may be clearly seen from Figures 3 and 4. In
proximity to the said drum a stationary bar ex is mounted in suitable bearings in
the machine frame, said har being capable of rotation and carrying at about its
centre a tripping pawl e, which when the bar is turned may be thrown into the path
of the lug e on the cover bow a*, so that as the drum continues to rotate the
spring cover with the bow will be pushed of the opening c and the contents of the
drum may be discharged. Mounted fast on a trunnion of the drum and adapted to
rotate with the same is an arm f having a lateral pin f' and a pawl g pivoted at g'
and having upwardly extending arm pivoted to a lever h, is so arranged that when
a pin at the end of a lever i fast on the bar e* is placed in the slot of the

page_text: lever (Fig. 6), the said. pawl shall lie in the path described by the pin of the
arin f, when the drum rotates.. When however the pin of the arm or lever i is
placed in the slot 4 of the lever h (Fig. 4) the pawl'g is withdrawn from the path
of movement of the pin. The operation of the device takes place in the following
manner :-
If it is desired to open the cover e of the drum the tripper e is thrown round
by a hand lever into the path of movement of the lug of the bow. When the
bow comes round the lug strikes against the tripper e and the motion of the bow
and cover will be stopped, so that the drum on rotating passes its outlet opening
from under the cover d and the contents of the drum will be discharged.
In order to close up the outlet hole again it is only necessary to adjust the pin of
the lever i in the slot of the lever à when the arm f with pin fwill strike the
pawl g at the moment when the orifice c is under the cover. This will throw the
pawl e upwards out of the reach of the lug e and the drum will continue to rotate
with the cover and bow in proper position over the outlet orifice.
The hollow trunnion and the feed hopper G may be omitted and the opening e
serve as inlet and outlet opening.
Water or other liquid may be fed to the mixing drum from a reservoir J and
through a feed pipe leading to the mouth of the hopper G. and thence into the
drum.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. A mixing drum and means for rotating the same, an opening in the periphery
of the same, a spring cover to said opening, a bow loosely pivoted to the trunnions
of said drum and adapted to press on the said cover and means for arresting said
bow cover when the drum is rotating and allowing the orifice to slide from
under neath the same in the manner and for the purpose substantially as
described.
2. A mixing drum and means for rotating the same, an orifice in the periphery
of the same and a spring cover to said orifice, a bow having its ends loosely pivoted
on the axle of said drum a bat e pivoted in proximity to said drum, a tripping
pawl e mounted on said bar and a lug on the cover bow, and means for bringing the
tripping pawl e into the path of movement of the lug of the bow in the manner and
for the purpose substantially as described.
3. A mixing drum and means for rotating the same, an orifice to said drum and
a spring cover to said orifice, a bow extending round the periphery of said drum
and having its ends loosely pivoted to the trunnions of said drum, a lug at about
the centre of suid how, a bar e mounted in proximity to said drum and a tripping
pawl e on said bar an arm fast on the drum axis and a pivoted pawl g having
an upwardly or approximately upwardly extending arm a lever to connect said
arm to a lever of the bar ex, and means for projecting the pawl g into the path of
movement of the arm of the drum, said arm being so mounted as to operate the
pawl g when the orifice of the drum is under the cover and to force the tripping
pawl out of the path of movement of the lug of the bow substantially as
described.
4. A mixing drum & having orifice e a bow pivotally connected to said drum axis,
a hollow trunnion to said drum and a hopper having its mouth extending into the
said hollow trunnion, a cover elastically pressed against the drum by means of the
bow aforesaid, a bar mounted in proximity to said drum and having a tripping paw!
as specified, a lug. on said bow adapted to contact with the tripping pawl and
means for adjusting the latter out of the path of movement of the said lug
substantially as described.
5. The combination of a rotary drum having an orifice in its periphery, a
spring cover to said orifice, a bow loosely mounted on the trunnions of said drum
and connected to the said spring cover, a lug to said how, and a tripping pawl

page_text: mounted in proximity to said drum and adapted to contact with said lug, and a set
of stirrer blades within said drum arranged slantingly to the direction of movement
of the drum substantially as described.
Dated this 23rd day of December 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.