US 3459222 A
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Aug. 5, 1969 P. w. M ELROY CONCRETE CONVEYING APPARATUS Filed Sept. 16. 1966 INVENTOR- PHILIP W MCELROY 1 A l Fdhhl \l w hllull TIM/w Iownsend Ioumsend United States Patent 3,459,222 CONCRETE CONVEYING APPARATUS Philip W. McElroy, 648 Page St., Berkeley, Calif. 94710 Filed Sept. 16, 1966, Ser. No. 580,046 Int. Cl. B65g 53/32; F17d 1/00; F161 27/00 U.S. Cl. 137-615 Claims ABSTRACT OF THE DISCLOSURE Concrete conveying apparatus including a generally flat base, three elongated boom sections mounted in an end to end pivotal relationship upon the base and having a flexible hose extending from the base through the pivotal mountings of the intermediate boom sections to the outer end of the third boom section and being arranged concentrically with the pivotal axes between th boom sections.
This invention relates to apparatus for conveying concrete and particularly to such apparatus capable of conveying concrete to an elevated site with great facility and precision.
Pouring concrete into elevated forms is an essential step in many types of building construction. For example, vertical building walls are frequently formed by a plurality of precast concrete slabs which slabs are joined together after their erection by a concrete column poured between confronting vertical edges of such slabs. In practicing this form of construction the slabs are typically erected and plumbed, after which a suitable concrete impervious form is constructed at the joint between the two slabs. The joint is completed by filling the form with fluid concrete from an opening in the top of the form. Such vertical column is of relatively small volume, as a consequence of which the actual filling of the form with concrete is a relatively short task. However, because the opening of the form is elevated above the ground at a height of 20 feet or more, complicated scaffolds or like expedients have in the past been necessary to ready the job for the pour. Typically, more time is spent raising the concrete to a level above the top of the form than is actually spent in discharging the concrete into the form.
It is therefore an object of the present invention to provide a concrete conveying apparatus that is capable of rapid positioning for discharging concrete at elevated positions. This object is achieved by providing a boom having three sections that are pivotally joined to one another, and by Supporting in the boom a conduit for con crete such as a flexible hose. Each beam is pivotally movable relative to the others so that the discharge end of the hose located at the outer end of the boom can be accurately positioned with rapidity and versatility.
Another object is to provide mechanisms for pivotally driving the individual boom sections relative to one another in an accurate and stable manner. Achievement of this object is made possibl by provision of an endless drive cable in which is interposed a double-acting hydraulic cylinder. The sole connection between the drive system and the boom that it drives is through a sheave mounted coaxially with the axis of pivotal movement between the booms. Accordingly, the drive system is extremely simple, and is capable of moving each boom through an arc of about 270 or more with respect to the remainin booms.
Still another object is to provide a pivotal joint which combines mechanical strength with unimpeded concrete flow therethrough. Such object is accomplished in the present invention by providing a hollow axle or shaft for 3,459,222 Patented Aug. 5, 1969 ice pivotally joining a pair of booms to one another and by conveying the fluid concrete through such hollow shaft. Thus flow through the conduit is unimpeded for any relative position of the two boom sections.
A further object is to provide a concrete conveying boom which is so arranged as to be foldable for ready transport. Thus the apparatus of the present invention can be conveniently mounted on a truck and can be moved around a job site to expedite placement of concrete in plural locations. Moreover, the apparatus can be rapidly transported from job to job.
These and other objects will be more apparent after referring to the following specification and accompanying drawing in which:
FIG. 1 is a plan view of the apparatus of the present invention shown in an extended position and taken generally along line 1-1 of FIG. 2;
FIG. '2 is a side elevational view of the apparatus of this invention, portions being shown in broken lines to indicate the folded position of the apparatus;
FIG. 3 is a fragmentary end view of the apparatus taken along line 3-3 of FIG. 1;
FIG. 4 is a cross-sectional view taken along line 44 of FIG. 3;
FIG. 5 is a partially schematic fragmentary view of the boom adjusting mechanism of the present invention;
FIG. 6 is a cross-sectional view at enlarged scale taken along line 66 of FIG. 2; and
FIG. 7 is a side view of the apparatus of FIG. 6 taken generally along line 7-7 of FIG. 6.
Referring more particularly to the drawing, reference numeral 12 indicates a base structure or turntable adapted to be pivotally mounted on a truck bed (not shown) which truck bed also carries a conventional concrete pump (also not shown). Such pump has a discharge end to which is connected a conduit 14, which in one apparatus designed according to the invention is formed in a circular configuration having an inside diameter of four inches. Base 12 includes a pair of upstanding vertical members 16 between the upper portion of which is pivotally secured a first or inner boom section 18. The pivotal connection is indicated at 20. A pair of hydraulic cylinders 21 is provided for positioning beam section 18 relative to base 12. At the end of section 18 remote from axis 20 a second or medial beam section 22 is pivotally secured about an axis 24. A third or outer beam section 26 is mounted to the outer end of second beam 22 by a pivotal connection shown in mor detail in FIG. 6.
Referring to FIG. 6, such pivotal connection is established by a hollow axle or pipe 28 rigidly secured to outer beam section 26 at 30 and journalled for rotation with respect to medial beam section 22 at 32. The pivotal connection between inner beam section 18 and medial beam section 22 indicated at 24 in FIG. 1 is substantially identical to the similar pivotal connection shown in FIG. 6. Hollow shaft 28 defines a bore 34 that has an inside diameter equal to that of conduit 14, as a consequence of which concrete freely flows through the pivotal connection.
In the exemplary embodiment shown in the accompanying drawing, the portion of conduit 14 joined to medial beam section 22 is formed by a rigid steel pipe section 36 joined to hollow axle 28 for relative rotation by a joint 38. The joint is formed by a flange 40 on pipe section 36 and a flange 42 on pipe 28, which flanges have smooth end faces for mating with one another in a slidable relationship. For securing the flanges together, a split ring 44 having a generally U-shaped cross section is placed in circumscribing relation to flanges 40 and 42. As seen most clearly in FIG. 6, the width across the space between the legs of the U shape of ring 44 approximately equals the combined thickness of the flanges, so as to secure together in fluid-tight, relatively movable position flanges 40 and 42. Bolts 46 are provided for securing ring 44 in place.
On the opposite end of hollow axle 28 a second steel pipe section 48 is secured by means of a conventional flange connection 50. Accordingly, outer beam section 26 is freely pivotally movable with respect to medial beam section 22 without in any way inhibiting the flow of concrete therethrough. It should be understood that the joint between inner beam section 18 and medial beam section 22 is substantially identical to the structure shown in FIG. 6 and includes a pivotal joint 38 and a flanged joint 50.
The end of pipe section 48 remote from flanged connection 50 is bent inwardly to the longitudinal center line of outer beam section 28 and terminates in a straight section parallel with the longitudinal axis of the outer beam at a rotatable fluid-tight joint 52 that is substantially similar to the joint 38 described hereinabove. Outwardly of joint 52 is a conduit section 54 which in one apparatus designed according to the present invention was formed of rubber hose of the same diameter as the remainder of conduit 14. Conduit section 54 terminates at a nozzle opening 55 and is supported on a arcuate saddle 56 that is formed in generally quarter circular. Saddle 56 defines a concavity for supporting hose section 54 and is pivotally mounted to outer beam section 26 at 58, the axis of pivotal movement afforded being concentric with the axis of rotation afforded by joint 52. Accordingly, as indicated by arrows 60 in FIG. 3, the discharge end 55 of hose section 54 can be pivoted with respect to outer beam section 26. Beam sections 18, 22 and 26 are pivotally positioned relative one another to align the discharge end of hose section 54 in proper position in respect to a concrete form opening and for this purpose, a mechanism depicted schematically in FIG. is provided.
Such mechanism includes a double-acting, hydraulic cylinder 62 mounted rigidly with respect to medial beam section 22. The cylinder includes a piston 64 having rods 66 and 68 extending from opposite ends thereof. Attached to rods 66 and 68 is a cable or like flexible tension member 70. Adjacent the inner end of beam section 22 a sheave 72 is provided for supporting cable 70. On the opposite end of beam 22 and concentrically rigidly mounted with hollow shaft 28 is a second sheave 74. An idler sheave 76 is carried on beam 22 for guiding cable 70 and for adjusting the amount of slack therein.
It will thus be seen that a hydraulic fluid is supplied to one or the other end of cylinder 62, that piston 64 will be moved within the cylinder and move cable 70 to a corresponding amount. Such action rotates sheave 74, as a consequence of which beam section 26 is pivoted relative beam section 22. With specific reference to FIG. 5, when piston 64 is moved to the rightward extremity of cylinder 62 a theoretical reference point on rod 66 is disposed at a position designated as A. Corresponding with such position outer boom section 26 resides at an angle with respect to boom section 22 identified by reference character A. When the same theoretical point on rod 66 is opposite reference letter B, outer boom section 26 resides at an angle indicated by reference letter B. Reference characters C and D in FIG. 5 show other correlations between the position of rod 66 and the angular position of outer beam section 26.
A similar mechanism is provided for positioning medial boom section 22 with respect to inner boom section 18 and because such mechanism is identical to that described in connection with FIG. 5, it need not be described again in detail. It is sufficient to say that such mechanism includes a hydraulic cylinder 62' which is operative to drive a cable 70' which cable is supported on idler sheaves 72' and 76 to drive a sheave 74 rotatively fixed with respect to medial section 22.
It is to be understood that conventional hydraulic controls (not shown) are provided for actuating cylinders 21,
62 and 62', such controls being mounted on the vehicle that supports base 12. Because such controls are entirely conventional, a detailed description of the same is unnecessary.
The operation of the present invention is as follows: the vehicle carrying the apparatus is positioned adjacent the site at which it is desired to deposit fluid concrete and by actuation of hydraulic cylinders 21, 62 and 62', boom sections 18, 22 and 26 are appropriately positioned so that the nozzle or discharge end 55 or hose section 54 is in alignment over the opening in the form or the like. In so establishing such position, cylinders 21, 62 and 62' can be actuated independently so as to afford great precision of positioning the nozzle. When the nozzle is in position, concrete is applied from a conventional truckmounted pump through conduit 14 and is deposited where desired. When the form or other receptacle into which the concrete is pumped has been filled to the desired level, the pump is de-activated and the apparatus is moved to the next location where concrete is desired. Because of the fact that hollow axles 28 between the respective boom sections are concentric with the axis of movement between the boom sections, the booms can be repositioned without interference, even though conduit 14 is entirely filled with concrete. When the nozzle is located at a new position, re-activation of the pump permits the pouring of the concrete to proceed.
For transporting the apparatus from job to job beams 22 and 26 can be moved into the position shown by broken lines in FIG. 2 so that the apparatus can be transported quickly on public highways without special trailer rigs or the like. The cooperation of hydraulic cylinders 62 and 62' with their associated cables 70 and 70, respectively, permits the beams to be moved to the folded position in a powered fashion and therefore materially shortens setup and cleanup time of the apparatus.
Thus, it will be seen that the present invention provides a boom for the placement of concrete which boom is extremely versatile, is capable of accurate and rapid positioning, and can be quickly and compactly folded for transport.
Although one embodiment of the invention has been shown and described, it will be apparent that other adaptations and modifications can be made without departing from the true spirit and scope of the invention.
What is claimed is:
1. Apparatus adapted to be mounted on a free selfpropelled vehicle for conveying fluidized concrete comprising: a generally flat base, a first elongate boom section mounted at one end to said base for pivotal movement relative to said base, a second elongate boom section pivotally mounted to the free end of said first boom section for pivotal movement about an axis transversely of said first section, a third elongate boom section pivotally mounted to the free end of said second boom section for pivotal movement about an axis transversely of said second section, a segmented flexible hose supported on said boom sections for conveying concrete from said base to the free end of said third boom section, and means for supporting said hose concentrically along the axis of pivotal movement between both said first and second boom sections, and said second and third boom sections, said sections being adapted to be pivotally moved into a folded unit wherein each of said sections is generally parallel to said base.
2. The invention of claim 1 wherein said hose supporting means comprises: a rigid pipe concentric with the axis of pivotal movement between said first and said second boom sections and forming an axle for pivotally joining last said sections, and means joining said hose to said pipe to afford relative rotative movement therebetween, said hose joining means including a flange formed on said hose, a complementary flange formed on said pipe, and a clamping ring of generally U-shaped cross-sectional form circumscribing said flanges to retain their faces in substantial slida-bly contacting position.
3. The invention of claim 1 in combination with a concrete discharge subassembly secured to the free end of said third boom section, said subassembly comprising: a saddle for supporting the hose therein, said saddle being of generally quarter circular form, means for mounting said saddle on the free end of said third boom section for pivotal movement about an axis substantially parallel with the longitudinal axis of said boom section and substantially tangent to the quarter circle of said saddle, whereby a hose supported in said saddle is pivotally movable about an axis parallel with the longitudinal axis of said third boom section.
4. Apparatus for conveying concrete comprising: a base, a first elongate boom section mounted at one end to said base for pivotal movement relative said base, a second elongate boom section pivotally mounted to the free end of said first boom section for pivotal movement about an axis transversely of said sections, a flexible hose supported on said boom sections for conveying concrete from said base to the free end of said second boom section, means for supporting said hose concentrically with the axis of pivotal movement between said first and second boom section, and means for pivotally positioning said second boom section relative said first boom section including a hydraulic cylinder fixed to said first boom section, a piston slidably supported in said cylinder, first and second rods extending from opposite ends of said piston and reciprocally movable in response to reciprocal movement of. said piston, a first sheave mounted adjacent the fixed end of said first boom section, a second sheave mounted concentrically with the pivotal axis between said first and second sections and being rotatively fixed with respect to said second boom section, and a cable circumscribing said sheaves and joined at its opposite ends to respective piston rods, whereby on movement of said piston in said cylinder in response to application of hydraulic fluid thereto said second boom section pivots relative said first boom section.
5. The invention of claim 1 in combination with a third elongate boom section pivotally mounted to said second boom section at the free end thereof, a hose extension joining said hose for conveying concrete to the free end of said third boom section, and means for supporting said hose extension in concentric alignment with the axis of pivotal movement between said second boom section and said third boom section.
References Cited UNITED STATES PATENTS 2,862,731 12/1958 Hedden et a1 285-272 3,096,797 7/1963 Bily 137-615 XR 3,114,392 12/1963 Harper 137-615 3,176,730 4/1965 Knight 137-615 XR 3,217,748 11/1965 Harper 137-615 3,221,772 12/ 1965 Arntzen 137-615 3,236,259 2/1966 Ashton 137-615 JORDAN FRANKLIN, Primary Examiner WERNER H. SCHROEDER, Assistant Examiner US. Cl. X.R.