Loading and Unloading Mechanism for Mixing-Drums or Other Receptacles Page: 8 of 10
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1;063459
gear 55 at its end. A short shaft 53 (Fig.
4) at right angles to shaft 8 is provided
with a pair of bevel gears 54 normally
loose on their shaft and always in contact
5 with said bevel gear wheel 55 on opposite
sides thereof. Each of these bevel gears 54
is provided with a clutch face 56 adapted to
be engaged by a similar opposing face 57
on the end of a sleeve 58 splined on the cen-
10 ter part of said shaft 53, said sleeve being
operated normally by a shifting lever 54a
(Fig. 7), the operation of which causes
said sleeve to slide on said shaft and engage
one or the other of the faces 56 as above
15 stated, thus reversing the rotary motion of
shafts 53 and 40 for the purpose stated..
The bearings" of shaft 53 are supported
on a curved bracket arm 59, which is bolted
at the other end to a fixed part 60 of the
20 machine frame, which also supports the
bifurcated bearing 61 of the proximate end
of the shaft 8.
The upper sprocket. wheel is not in one
piece, but consists of three-disks: The mid-
25 dle one 62 is provided with the sprocket cogs
and its.peripheral part overlaps at the sides
the smooth peripheral faces of the other
disks 63 and 64, covering also intervening
frictional washers. of leather or equivalent
30 material 65. Disk 63 is fixed on the shaft
40, but disk 64 is splined on the end of said
shaft and pressed against said middle disk
62 by a spring 66, the resilient action of
which .is regulated by a nut 67 on screw-
35 threads on the end of said shaft. The mid-
die disk 62 of this sprocket wheel is free
on the shaft 40, except as it is held by the
friction of the said disks .63 and '64 and the
intervening washers, the amount of friction
40 being governed as above stated. Conse-
quently the sprocket and chain connection
between shafts 8 and 40 will yield under a
predetermined strain, which is set just suffi-
cient to draw the discharge spout 38 out of
45 the drum P to allow a. batch of material to
be mixed and then to throw it into the
drum when the batch is ready to be dis-
charged, which operation is effected by the
shifting of the lever 54a as above stated. A
50 stop 45a on-casting 45 prevents the discharge.
spout from turning downward too far on
its pivots as it withdraws from the drum P
and holds it in proper position to renter
the same when the door is opened. A han-
55 dle 45b also on the side of said casting is
used in aiding this movement of said. spout
to insure .perfect accuracy of entrance and
withdrawal by tilting said spout on its pivot.
Two brackets 70 of cast iron riveted to the
60 machine frame as shown provide bearings
for the rock-shaft 40 and also sustain the
weight of the discharge spout 38, as the arms
39 are fastened to the rock-shaft 40, as above
stated.a
A pipe 69 (Fig. 2) of proper refractory 65
material conveys the gaseous products of
combustion from the furnace C to the mix-
ing drum P, said pipe being lined with as-
bestos cement 69a or some other noncom-
bustible material. Said gases are forced 70
through pipe 69 by a fan pipe 15a connected
to the draft fan 15 and connected at the
other end to the bottom of furnace C, said
fan being driven by the belt 14 running over
the fly wheel 13 as hereinbefore stated. The 75
furnace C is needed whenever it is necessary
to subject the bituminous mixture to intense
heat for thoroughly combining the ingredi-
ents. But this is not necessary in producing
concrete and some other paving mixtures. 80
If desired the furnace C may then be ad-
vantageously removed or left on the main
frame as desired. To permit this it is
mounted on a frame or platform of its. own
and detachable at 71 from the main frame. 85
The operation of the machine is as fol-
lows: The engine being started, the mixing
drum is driven, through the connections
stated, in regular rotation, and the sand or
rock or sand 'and rock or the natural rock 90
asphalt is automatically dumped into the
mixing drum by the charging bucket, while
the liquid asphalt or any substitute is al-
lowed to flow down in hand regulated pro-
portions and total quantity through the 95
pipes hereinbefore mentioned, and the heat-
ed gases are forced into the drum -by the
fan and act on these ingredients, if such
heating be needed. The mixing buckets, by
their action while rotating, convert said in- 100
gredients into a plastic mass; when the mix-
ture is ready to be discharged, the lever 54a
is shifted and the shaft 40 is then acted on
by means of the endless chain 51, which ac-
tion causes the discharge spout to be inserted 105
into the drum. The same action raises the
door 47 and allows the contents of the drum
to run out into any receptacle or onto the
ground, through the discharge spout. When
enough of the ingredients have run out, or 110
it is necessary to reheat it, or there is occa-
sion to recharge the drum, the lever 54a is
again shifted and the discharge spout is
withdrawn from the drum and the door
drops down and closes the axial opening' of 115
the drum, holding the heat when heating
asphalt and preventing -the concrete from
slopping out when mixing the same. The
charging bucket will be automatically oper-
ated at regular intervals if the winding drum 120
cr pulley 33 be alternately engaged and dis-
engaged by its shifting lever and clutch
aforesaid so as to alternately tilt the said
charging bucket for emptying, and return
it to its normal position. - 125
As I do not -in the present application
claim any specific features of the boiler, en-
gine or furnace, it is unnecessary to minutely
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Hahn, William Berton. Loading and Unloading Mechanism for Mixing-Drums or Other Receptacles, patent, May 27, 1913; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth853806/m1/8/?rotate=90: accessed April 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.