US2116708A - Apparatus for compacting concrete and the like - Google Patents

Description

May 10, 1938. R; A. NIEKAMP 2,115,708

APPARATUS FOR COMPACTING CONCRETE ND THE LIKE Filed Jan. 1l, 1936 Patented May I, 1938 lUNITED STATES PATENT OFFICE Richard A. -iekamp, Dayton, Ohio, assignor to The Master Electric Company, Dayton, Ohio, a

corporation of Ohio Application january' 11, 193s, serial No. 58,784

4 claims. (ci. 259-72) This invention relates generally to apparatus for compacting concrete or other plastic material, and more particularly to a vibrator adapted to be submerged in the material and vibrated so as to compact it.

T he invention provides a means for vibrating and compacting concrete so as to produce a dense strong product which is homogeneous in characterfrom a mix in which the proportion of water to concrete is relatively small.

In the accompanying drawing which illustrates two embodiments of my invention,

Figure 1 is a longitudinal vertical section through a vibrator;

Figure 2y is an enlarged vertical section of a portion of the apparatus shown in Figure 1;

and

Figure l3 is a longitudinal vertical section through another embodiment of the invention, partsbeing broken away.A

Referring more particularly to the embodiment illustrated in Figures 1 and 2, the vibrator has a casing indicated generally by the reference nume-ral 2. The casing is formed of an upper section 3, an intermediate section 4, and a lower section 5. 'I'he lower section is connected to the intermediate section by bolts 6 extending through llanges 'I and 8 formed on the sections 5 and 4, respectively. Sealing material 9 is placed between the ilanges to prevent leakage of cement into the hollow'interior of the vibrator.

The lower portion of the upper casing section 3 is formed with an annular groove I0 and an outwardly extending flange II. The upper end of the intermediate section 4 is provided with an outwardly extending ilangel I2. The ilanges II and I2 are spaced apart by an annular washer I3 of rubber or other resilient material. Bolts I4 extend through the flanges II and I2, and a rubber washer I5 is inserted around each of the bolts between the flange' I2 and a metallic washer I6. Surrounding each of the bolts is a non- Q resilient metallic spacing sleeve Il which contacts with the flange II and the washer I6. The openings I8 in the flange I2, through which the bolts and spacing sleeves extend, are somewhat larger eilect, form a single section since they are rigidly bolted together by the bolts 6.

The intermediate and lower casing sections are provided with vanes I9 extending outwardly from the body portions of the sections. In the embodiment shown, the vibrator has four of these vanes, but this number may be varied if desired. The vanes I9 at the portions adjacent the flanges 'I and 8 are of substantially the same width as the flanges. The width of the ilanges, however, decreases in a direction upwardly from the flange 8 so as to provide a reduced or neck .portion 20 of a diameter substantially equal lto the diameter of the body portion of the intermediate section 4. The width of the flanges then increases so that in the region of the flange I2 at the upper end of the intermediate casing section, the vanes I9 are of substantiallyv the same width as the flange I2. The vanes I9 increase the eiliciency of the compacting action on the concrete. The reduced or neck portion 20 provided on the vibrator by narrowing or eliminating the vanes I9 at that portion enables the concrete to close in about the vibrator at the neck portion so that vibration is imparted to the concrete radially in all directions, that is, laterally, downwardly and upwardly, thereby increasing the effectiveness of the vibrating action.

An electric motor indicated generally by the reference numeral 24 is located in the upper casing section 3. The stator 25 of the motor lits tightly Within the casing section 3 and rests on an inwardly extending flange 26. Electric current is supplied to the windings 2`I of the stator by means of a flexible conduit 28 which extends upwardly through a head 29 and through a coupling section 30 to which a flexible hose, not

shown, may be connected. The flexible hose is provided with a handle which may be grasped by the operator, the ilexible hose further decreasing any transmission of vibration to the hands of the operator. The conduit 28 extends through the flexible hose to a source of electric current. Sealing means 3| is provided in the head 29 for preventing inleakage of concrete.

'Ihe drive shaft 32 of the motor armature 33 Ais mounted in ball bearings 34 and 35 supported, respectively, in heads 29 and 35a, the motor, bearings and electrical conductor 28 all being located in the upper casing section 3. The motor or driving shaft 32 is connected to a driven or eccentric shaft 34 by means of a flexible driving connection 38. In the embodiment shown in Figures 1 and 2, this flexible driving connection is made of rubber and is provided with recesses 31 and 38 for receiving the shafts 32 and 34, respectively. Each of the shafts is provided with splines 39 and the shafts are molded into the exible coupling. This provides a flexible resilient dn'ving connection between the drive shaft and the eccentric shaft.

A weight 40 is mounted eccentrically on the shaft 34 so that upon rotation of the shaft the tions 4 and 5 to vibrate in a circle relative to the upper casing section 3, this vibration being l permitted due to the resilient connection between the casing sections 3 and 4. The vibration is transmitted radially in all directions .due to the shape of the vanes I8. Ihe resilient coupling and sealing means between the casing sections 3 and 4 prevents vibration being transmitted to the upper section which contains the motor and motor bearings andlalso prevents vibration from being transmitted to the operator.

'Ihe embodiment illustrated in Figure 3 is, generally speaking, similar to that just described, except that instead of employing a resilient driving connection between the driving shaft and eccentric shaft, an internal gear and pinion is employed. Also, in the embodiment shown in Figure 3, the eccentric or driven shaft is located so as to be oil'set or out of alinement with the driveshaft. Referring vto Figure 3, the casing is formed of an upper sertion 50, an intermediate section 5l and a lower section 52. The sections 50 and 5| are connected together by resilient couplingL and sealing means 53 similar toI that previously described so as to allow relative vibration between the .two sections of the casing.

An internal gear 54a is secured to the lower end of the drive shaft 54. A pinion 55 located inside of the gear 54a and meshing with the teeth 56 of the gear is secured to the upper endV of a driven or eccentric shaft 51. 'I'he eccentric shaft is mounted in roller bearings 53 and 59, and secured te the shaft intermediate these bearings is an eccentric weight 6I. Rotation of the eccentric weight causes vibration of the casing sections 5i and 52 relative to the upper casing section 5l, as in the embodiment previously described. The pinion 55 tits loosely in the internal gear 54a so as' to allow for this relative vibration of the casing sections and still provide a flexible driving connection for the eccentric weight.

'I'he formation of the casing in a plurality of sections provides ready access to the operating mechanism located within the casing. It has been found that'where the casing is made ina plurality ci' sections rigidly connected together by bolts without the use of a resilient connection between the sections, the vibration is transmitted from the lower to the upper section, rapidly wearing out the bolts and 'causing the sections to fall apart or at least' to allow leakagel of cement into the interior. The resilient coupling and sealing means, particularly when employed in connection with the non-resilient spacing sleeves surrounding the bolts, provides an effective arrangement forallowing limited relative vibration between the casing sections and preventing the vibration from'being transmitted from one section tothe other. It has been found to materially increase the life of the vibrating apparatus.

In the embodiment illustrated in Figure 3, I have shown the eccentric shaft 51 in an offset position relative to the drive shaft 54. This arrangement increases the vibration of the lower casing section. The offset arrangement of the eccentric shaft with respect to the drive shaft may be employed not only with the internal gear and pinion driving connection illustrated in Figure 3, but may be employed also in connection withthe resilient driving connection 36 illustrated in Figure l. In-this case the recesses 31 rvand 38 provided in the rubber coupling 38 are offset to receive the drive shaft and driven shaft.

I have illustrated and described two embodiments .of my invention. It is to be understood, however, that the invention may be otherwise embodied within the scope of the following claims.

I claim;

1. Apparatus for compacting concrete and the like, comprising a casing formed of a plurality of sections, resilient coupling means connecting the sections together, a motor having a driveshaft and bearings therefor all located in one section, an eccentric shaft, bearings therefor and an eccentric weight associated with the eccentric shaft all located in another section, and a yielding driving connection between the drive shaft and the eccentric shaft, the drive shaft and eccentric shaft being out of alinement with each other.

2. Apparatus for compacting concrete and the like, comprising a casing formed of a plurality of sections, resilient coupling means connecting the sections together, a motor having a drive shaft and bearings therefor all located in one section, Aan eccentric shaft, bearings therefor and an eccentric weight associated with the eccentric shaft all located in another section, and an interna] gear and pinion driving connection between the drive shaft and eccentric shaft,` the drive shaftv and eccentric shaft being out of alinement with each other.

3. Apparatus for compacting concrete and the like, comprising a casing formed of a plurality of sections having spaced apart flanges on their adjacent ends, resilient sealing means between the flanges, bolts extending through the flanges and sealing means and connecting the sections together in such manner as to allow relative movement between the sections, non-resilient spacing sleeves surrounding the bolts, and means inside the casing for causing vibration of the dinerent sections relative to each other.

4. Apparatus for compacting concrete and the like, comprising aV casing formed of a plurality of sections, said casing adapted to be submerged in the concrete. resilient coupling means connecting the sections together, a motor having a drive shaft and bearings therefor, all located in one section, an eccentric shaft, bearings therefor andan eccentric weight associated with the eccentric shaft, all located in another section, a yielding driving connection between the drive shaft and the eccentric shaft, and ilexible supporting means connected to the casing whereby the section of the casingcontaining the motor may be submerged in the concrete.

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