US 3042386 A
Description (OCR text may contain errors)
July 3, 1962 A. wYzr-:NBEEK 3,042,386
CONCRETE VIBRATOR TOOL Filed sept. 2e. 1960 Z; Z4 Z 52 505] ZJ ZQ Zz d m f L..
3,042,386 CONCRETE VIBRATGR TUOL Andrew Wyzenheek, 850 Lake Shore Drive, Chicago, ill. Filed Sept. 26, 1960, Ser. No. 58,352 4 Claims. (Cl. 259-1) This invention relates to a concrete vibrator tool, and, more particularly, to the vibrator head housing portion of the tool which is the element thereof physically in contact with the cementitious material to be compacted.
The usual vibrator head includes an elongated tubular housing in which an eccentric rotor is mounted. The rotor may be powered from one end through a flexible cable coupled to a motor which conventionally is `carried by the masonry worker. Alternatively, the motor may be incorporated in the head itself and, in certain instances, provide a vibratory action itself. ln use, the vibrator head is thrust into the fluid mix, the mix being supported within temporary forms. The function of the vibrator is to insure uniform dispersion of the mix within the form.
In the past, there has been a limited effectiveness of vibrators in achieving the principal purposes of uniformizing the cementitious mix within the forms. lt has been especially diicult to drive the concrete into the corners of the form to develop the desirable monolithic faces on concrete columns, beams, etc. Also it has been diflicult to substantially remove air from the mix, the presence of which is evidenced by a non-level top surface. In the past, the achievement of a substantial uniformity has not only required prolonged times of treatment, but also required artistry on the part of the masonry Worker. Thus, the art has been handicapped in large installations where vibrators are particularly effective-the time consumed is disadvantageous and the human element varies so that often the desirable sharp corners are lacking, resulting in an indiiferent form and one that may require special plastering after the concrete has set.
Itis an object of this invention to provide a novel type of vibrator tool characterized by an efficiency which is `materially greater than that present in contemporary vibrators. Another object is to provide a novel vibrator tool, particularly the tubular housing portion thereof, which is characterized by a departure from the usually provided smooth, Cylindrically surfaced housing and instead uses a housing having an external surface contoured to develop a unique pushing action in compacting concrete. Still another object is to provide a tubular housing for a vibrator tool in which the external surfaces approximates that of a prism, i.e., the transverse section is essentially polygonal. Yet another object is to provide a novel type vibrator wherein both the housing and tip are uniquely contoured so as to provide a superior compacting of concrete and like mixes.
Other objects and advantages of this invention may be seen in the details of Construction and operation as set down in this specication.
The invention will be explained in conjunction with an illustrative embodiment in the accompanying drawing, in which- FIG. l is a perspective view of a vibrator being used in compacting concrete;`
FIG. 2 is an exploded elevational sectional view of the vibrator head with one end of the housing portion in partial section;
FIG. 3 is a longitudinal sectional View of the vibrator head seen in FIG. 2;
FIG. 4 is a transverse sectional View through the housing portion of the vibrator head seen in FIGS. 2 and 3; and
FIG. 5 is a View similar to FIG. 4 but showing a housing of a different cross-sectional configuration, i.e., quadrilateral, as contrasted to hexagonal.
In the illustration given, and with particular reference to FIG. l, the numeral 10 designates a concrete form in which concrete 11 has been poured. A masonry worker 12 is seen holding the vibrator tool 13, which includes a motor 14 and exible shaft 15. The Vibrator head generally designated 16 is inserted into the concrete 11 and thus, in FIG. l, is shown in dotted outline. The forward portion of the vibrator head can be seen in greater detail in FIG. 3.
In FIG. 3, it is seen that the head 16 includes an outer housing of a generally tubular shape and which is designated 17. The end of the head 16 remote from the flexible cable or other power source is equipped with a tip 18 which may partake of the character seen in my Patent No. 2,705,618, issued April 5, 1955. However, excellent results are obtained with a type of the character shown, wherein the tip 18 is welded to the housing 17 as at 18a. The end of the head 16 adjacent the ilexible cable or shaft 15 is equipped with removable cap 19. The cap 19 may beconveniently mounted on the housing 17 by means of threaded portions 20 and 19a, thus the exterior of the head 16 includes the surfaces provided by the elements 17-19. The cap 19 is interiorly equipped with an oil seal 21. The cap 19 is also equipped with a hexagon drive sleeve 22 which is adapted to be coupled to the exible shaft 15. More specifically, the hexagon drive sleeve is threadedly connected to the eccentric rotor 23 as on the threaded end 24. The rotor 23 is equipped with a shoulder portion 2S which is journaled in a bearing 26.
The tip end of the eccentric rotor 23 is equipped with a similar shoulder portion 27 which is journaled in a bearing 2S (see FIG. 3) and the tip end of the rotor 23 is equipped with a threaded portion 29 which carries a lock nut 30. A washer 31 is interposed between the nut 30 and the bearing 27. A washer 32 is interposed between the oil seal 21 and the bearin g 26.
In accordance with conventional practice, the operation of the tool is achieved through coupling the hexagon drive sleeve to a rotating iiexible shaft 15. The drive sleeve 22 being directly coupled to the rotor 24, rotor 23 induces rotation of the rotor 23 within the bearings 26 and 28. The entire internal assembly, shown in exploded form in FIG. 2, can be removed from the head 16 by rst detaching the cap 19 from the housing 17. The tip end bearing 28 is effectively secured to the rotor 23 by means of the lock nut 30 so the tip end bearing can be readily removed for replacement, repair, or the like. As seen in FIG. 3, the bearing 28 is supported against a projection 18h of the tip 18.
Reference to FIG. 4 shows that the housing 17 is hexagonal in transverse section. Alternatively, the cross-sectional shape seen in FIG. 5 (square or quadrilateral) and designated by the numeral 117 may be usefully employed. Desirably, the interior contour is similar, and Where the driving motor is installed in the casing, this provides circumferentially disposed passages for air cooling of the cylindrically-shaped motor.
Comparison of the operation of a tool equipped with the prism-shaped housing as contrasted to a tool equipped with a cylindrical1y-shaped housing of about the same external surface area, revealed that under identical conditions of operation, almost complete compacting (i.e., elimination of air pockets and directing the mix thoroughly into all corners) was achieved in fteen seconds with the inventive tool, while a very imperfect compaction was achieved through the conventional tool, and this even when operated for twenty-six seconds. In both instances,
being inserted into the center of the test block under identical conditions in each case.
Additional advantageous operation can be achieved when the tip 18 is at-surfaced, as seen in FIGS. 2 and 3, the surfacing of the tip corresponding to the surfacing of the housing 17. It will be appreciated that other crosssectional contours may suggest themselves to those skilled in the art, depending upon the intended use of lthe tool.
Although the mechanism of the invention is not readily visible from the operation of the novel head, it is believed that the gyratory-type motion induced in the head 16 results in developing a unique multi-directional thrust on the concrete-the number of thrusts per revolution being one more than the number of faces on the housing 17. Thus, a five-sided thrust pattern is produced using a square-shaped tip. This induces rapid and thorough compacting, eliminating the need for the masonry work to make successive probes at different spots and thereafter patch up the resultant form.
While, in the foregoing specification, I have set forth a detailed description of an embodiment of the invention for the purpose of illustration thereof, many variations in the details herein given may be made by those skilled in the art Without departing from the spirit and scope of the invention.
1. In a vibrator for compacting concrete, and the like, an elongated hollow housing, a bearing adjacent each end of said housing, an eccentric rotor rotatably mounted in said bearings, said housing having a shape in transverse section intermediate the ends of said housing of a regular polygon of not more than six sides.
2. The structure of claim l in which said regular polygon has four sides.
3. A vibrator housing, comprising an elongated tube, said tube being hollow and having means for mounting bearings adjacent each end thereof and adapted to receive means for vibrating Said housing, one end of said tube being equipped with means for coupling to power means, a transverse section through said tube intermediate the ends thereof forming a regular polygon of not more than six sides.
4. The structure of claim 3 in which said regular polygon has four sides.
References Cited in the le of this patent UNITED STATES PATENTS 1,947,941 Jackson Feb. 20, 1934 2,705,618 Wyzenbeck Apr. 5, 1955 2,808,238 Spitler Oct. 1, 1957 2,825,230 Walker Mar. 4, 1958 2,924,730 Spitler Feb. 9, 1960 FOREIGN PATENTS 393,668 Germany Apr. 5, 1924 777,120 France Nov. 17, 1934