CONCRETE PUMP O
From Concretepumping
Patented Sept. 27, 1938 2,131,681
UNITED STATES PATENT OFFICE
2,131,681
CONCRETE PUMP
Charles F. Ball, Milwaukee, Wis., assignor to Chain Belt Company, Milwaukee, Wis., a corporation of Wisconsin Original application August 19, 1931, Serial No. 558,175. Divided and this application June 11, 1934, Serial No. 730,108 Z Claims. (Cl. 83—73)
This invention relates to pumps of the reciprocating piston type and has for one of its objects to provide a pump of this character which will be particularly adapted for the pumping of con- 5 -' crete and other similar plastic mixtures which embody relatively large heavy aggregates. A still further object of the invention is to provide a concrete pump having a receptacle for receiving pre-mixed, or partially mixed concrete, 10-or even unmixed concrete making materials, which receptacle is adapted to mix and to maintain such concrete in completely mixed and un- segregated condition and to feed the same to the pump cylinders. 15 A still further object of the invention is to provide a concrete pump which will be more efficient in action than those which have been heretofore proposed. With the above and other objects in view which 20 will appear as the description proceeds, the invention consists in the novel details of construction and combinations of parts more fully hereinafter set forth and particularly pointed out in the appended claims. 25 Referring to the accompanying drawings forming a part of this specification in which like reference characters designate like parts in all the views:— Figure 1 is a side elevational view, partly broken 30 away, of a concrete pump constructed in accordance with the present invention; Figure 2 is a partial plan view of the parts shown in Figure 1, the concrete receiving and agitating drum, the power plant, and the fluid 35 pressure pump, being omitted and certain of the parts being shown in section; Figure 3 is an end elevational view partly broken away, of the parts shown in Figure 1 as seen from the right of the latter figure; 40 Figure 4 is an end elevational view, partly broken away, of the parts shown in Figure 1 as seen from the left of the said figure, the power plant and certain other parts being omitted for the sake of clearness; 45 Figure 5 is a fragmentary side elevational view of the rear end portion of the apparatus, as seen from the side opposite to that shown in Figure 1, and showing the fluid pressure pump; Figure 6 is a fragmentary vertical sectional 50 -view through the outlet conduit showing a slightly modified form of outlet valve construction; Figure 7 is a diagrammatic view illustrating the fluid circuits between the fluid pressure pump, the control valve and the concrete pump pistons; 55 -and Figure 8 is a fragmentary sectional elevational view, showing the means for automatically shifting the fluid control valve. In the said drawings the numeral !0 indicates a main frame of substantially rectangular con- 6 struction, which may be stationary if desired, but which is here shown as being mounted upon suitable wheels 11, in order that the pump may be portable and moved from place to place as desired. The said frame 10 is here shown as com- 10 prising the longitudinal side channels 12 and 13, and the transverse members 14, 15, 16, 17 and 18, rigidly connected in any suitable manner to the said channels. As best shown in Figures 2, 3 and 4, the transverse member 15 carries a pair of 15'" clamping blocks 20, while the member 17 carries a companion pair of blocks 21, which pairs of blocks receive and hold the longitudinally extending shafts 22,..upon which are rotatably mounted the drum-supporting rollers 23. A con- 20 crete receiving and agitating drum 24 is mounted for rotation in either direction upon the rollers 23, which drum is or may be of substantially the construction commonly employed in rotating- .. drum concrete mixer practice. The said drum is 25 provided with the axial charging and discharging openings 25 and 26, respectively, into the former of which extends a charging hopper 27 carried by suitable upright supports 28. The interior of the drum carries the well known helical 30 ' mixing blades 29, arranged to thoroughly mix the constituents when the drum is rotated in one direction, and which also serve to move the concrete from right to left, as viewed in Figure I, toward the discharge opening 26 when the drum 35 is rotated in the opposite direction; and the discharge end of the drum is preferably provided with the transverse curved pick-up and discharge troughs 30, which through the rotation of the drum in the last mentioned direction, pick-up and 40 positively move the concrete to and through the discharge opening 26, all as is disclosed and claimed in my copending application filed June 24, 1931, Serial No. 546,591, now Patent No. 2,006,728, granted July 2, 1935. 45 The discharge opening 26 of the drum communicates with the horizontal passage 31 of a chest 32, which, as is best shown in Figure 4, is provided with a pair of downwardly extending discharge passages 33, each leading to a valve 50 housing 34. The chest being stationary, whereas the drum is rotatable, a suitable slip joint or running seal 35 is provided between the two, to prevent escape of the concrete. The valve housings 34 are each provided with 65
