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Патент USA US3096978

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July 9, 1963
J. L. KEMPTHORNE
~
3,096,968
PROCESS FOR MAKING CONCRETE FOR APPLICATION BY SPRAY GUN
' Filed Sept. 14, 1960
‘
2 Sheets-Sheet 1
28
Eye .4?
49.
‘,INVENTOR,
July 9, 1963
»
J. |_. KEMPTHORNE
3,096,968
PROCESS FOR MAKING CONCRETE FOR APPLICATION BY SPRAY GUN
Filed Sept. 14, 1960
2 Sheets-Sheet 2
by, 5
27 A
‘
2e
28 R
32
42
45
52
49
IN VENTOR.
3,096,968
United States Patent 0 "ice
Patented July 9, 1963
1
2
3,096,968
dry concrete mixture through a hopper 26‘ when a valve
27 is opened by means of a hand-operated lever 28. The
lower end of compartment 25 is closed and opened by
movement of a valve 30, which is operated by a hand
PROCESS FOR MAKING CONCRETE FOR
APPLICATION BY SPRAY GUN
James Lewis Kempthorne, Spring?eld, NJ.
(7 Ramsay Road, Montclair, NJ.)
Filed Sept. 14, 1960, Ser. No. 55,911
1 Claim. (Cl. 259-147)
operated lever 32, the valve 30* being opened when the
dry concrete mixture is to fall from the upper compart
ment 25 to compartment 3-3 below. A hollow base 35 is
fastened to the bottom of compartment 33‘ and contains
a rotating cone 37. The cone is mounted on, and for ro
This invention relates to a method of making concrete
which is applied through a tube and a spray gun at the 10 tation with, a vertical shaft 38 which may be driven in any
suitable manner. Projecting radially from the lower cir
end of the tube.
cumference of the cone, as shown in FIGURE 2, are
The present method comprises mixing cement with the
spaced teeth 39 between which the concrete mixture falls
usual aggregate of sand and graded sizes of stone, blow
when it leaves lower compartment 33. As the cone turns,
ing the mixture through a tube by means of compressed
air, blowing dry steam into the stream of the compressed 15 the material between the teeth is brought under a blow-out
tube 40. The blow-out tube 40 projects into the men
air and mentioned mixture, and injecting water into said
tioned base 35, above the teeth of the cone, and is closed
stream adjacent the delivery end of said tube. It is neces
at its inner end, which terminates adjacent the cone, and
sary to use dry steam, as opposed to the usual or ordinary
is open at its bottom, from which bottom a mixture of
steam, which is wet steam, as the latter clogs the spray
gun head, as found in practice and acknowledge in the 20 compressed air and dry steam issues and forces the mate
published trade literature. The generation and use of dry
steam has long been known for certain uses, as for the
rial from between the teeth, the dry steam, as aforesaid,
su?iciently wetting the cement to prevent dust when
sprayed. Said mixture of compressed air and dry steam
enters tube 40 from a pipe 42, into which the dry steam
operation of steam locomotives, wherein the water is re
moved before the steam is injected into the cylinders but
such steam has not heretofore been used in the making of 25 enters from tube 44 and into which compressed air enters
from pipe 45. As the concrete mixture leaves the teeth
concrete. A simple practical test, for determining whether
under the blow-out tube 40, it slides down an incline 47
the steam is dry enough for the present purpose, is to hold
and into a tube 49 which is secured into the base 35, and
the hand about 15-18 inches from the spray gun head as
the mixture is blown through tube 49' and the spray head
the steam issues therefrom. If the hand remains practi
cally dry, the steam is dry for the purpose. This steam, 30 50' at the end thereof. A water pipe 51, having a control
valve 51 therein, supplies water to the spray head. A con
while substantially dry, and within the meaning of the
trol valve 52 is placed in the compressed air line.
term “dry steam,” has a very small amount of water in it,
which amount is su?icient to wet the cement enough to
prevent it from escaping as dust clouds as it emerges from
What I claim is:
The method of making concrete, comprising mixing
the gun head, which dust has been responsible for ordi 35 cement with the usual aggregate of sand and graded sizes
of stone, blowing the mixing through a tube by means of
nances in some cities prohibiting the use of the spray gun
compressed air, blowing dry steam into the stream of the
method for spraying concrete. Additionally, much con
compressed air and mentioned mixture, and injecting water
crete was lost by this method.
into said stream adjacent the delivery end of said tube.
The accompanying drawings show the essential compo
nents of previously known apparatus which may be used 40
References Cited in the ?le of this patent
for carrying out the process.
UNITED STATES PATENTS
In the drawings:
1FIGURE 1 is a perspective view of the front of the
1,161,789
Orth ________________ __ Nov. 23, 1915
apparatus;
FIGURE 2 is a perspective view of part of the appara 45
tus of FIGURE 1, and
FIGURE 3 is mostly a vertical section of the apparatus
of FIGURE 1.
Referring to the drawings for a detailed description
thereof, and more especially to FIGURE 3, the appara 50
tus comprises an upper compartment 25 which received a
1,437,331
1,556,252
1,731,953
2,340,832
3,012,732
Alexander __________ __ Nov. 28,
Shepherd _____________ __ Oct. 6,
Thomson _____________ __ Oct. 15,
Darnm et a1. __________ __ Feb. 1,
Kempthorne __________ __ Dec. 12,
1922
1925
1929
1944
1961
1,001,707
France ______________ __ June 21, 1916
FOREIGN PATENTS
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