US1651819A - Method of and apparatus for making concrete posts - Google Patents

Description

Eco $7 1270 I E939 B. HANNA METHOD OF AND APPARATUS FOR MAKING CONCRETE POSTS Filed Jan.,26. 1926 2 smmsm 1 Dec. 6, N2 7.

' mama D. a. HANNA METHOD OF AND APPARATUS FOR MAKING CONCRETE POSTS Filed Jan.26. 1925 Patented Dec. 6, 1927.

UNITED .sT-Ars oF IcE.

DAVID B. HANNA, OF CHICAGO, ILLINOIS.

METHOD OF AND APPARATUS FOR MAKING CONCRETE POSTS.

Application filed January 26, 1926. Serial No. 83,785.

to combine rammingor jolting with rotation and before entering into a detailed description I wish to point out,v as is well known in the art, that ramming or jolting concrete after it has been poured greatly increases the compactness or density of prod ucts. In posts used for lighting purposes it is, of course, often necessary to provide a raceway for the electric wires which, in an ordinary molding operation, necessitates the use of a core.

, With the foregoing in mind it is an object of my invention to ram or jolt a mold having a core and subsequently to rotate it in order to force the concrete centrifugally away from the core and thereby release the core so that it can be easily withdrawn. Ramming or jolting would, of course, tend to pack the concrete so tightly around the core that it could not be easily removed if at all. lVith my process and apparatus 1 rotate the mold immediately after the ramming or jolting operation which will still further increase the density of the concrete and at the same time free the core.

More specific objects of the invention reside in the provision of an apparatus for jolting the mold in a substantially vertical position and then subsequently rotating it without changing its position andthe pr0- vision of a supporting table in an apparatus for carrying this out which can be jolted at will or rotated at will.

The foregoing together with such other objects as may appear hereinafter or are incident to my invention I attain by means of a construction which is illustrated in pre fer-red form in the accompanying drawings, wherein Fig. 1 is a side. elevation of my improved apparatus;

' Fig. 2 is an enlarged section on the line 2-2 of Fig. 1;

Fig. 3 is an enlarged elevationpartly in section similar to the showing of Fig. 1 but illustrating only the lower end of my apparatus, namely the table; and: I FFig. 4 is a section on the line 44 of Referring to the drawings it will be seen that the mold 5 is provided with a core6 and that it stands upon the table indicated as a whole by the reference character A. The mold can be secured in any desirable way to the supporting shelf or ledge 7 of the table by means of the bolts 8.

The upper end of the post mold is positioned and guided by the surrounding track 9 adapted to fit in the grooves of the rollers or wheels 9*. Two of these rollers are stationary or fixed to the vertically moving guide carriage 10 (see Fig. 2) while the third j roller is mounted near the outer end of the curved retaining arm 11 which is adapted to be coupled to the curved retaining arm 12 by means of the pin 13. When it is desired to insert or release a mold the pin 13 is uncoupled and the arms .11 and 12 thrown back out of the way.

The'guide carriage 10 is mounted for up and down movement on the I-beams 14 and is connected over the pulley wheel 15 to the counterweight 16 by means of the cable 17. It will therefore be seen that my apparatus can readily take care of different heights of posts. The guide carriage 10 can be clamped at any desired position by means of the bolts 18 and hand operated nuts19 as will be clearly seen upon inspection of Fig. 2.

The table comprises the framework 20 with shaft 21 for the jolting operation and shaft 22 for the rotating operation, said shafts being substantially vertically disposed and parallel to each other. Transversely of the first two shafts in the bottom of the framework I provide the operating shaft" 23 driven in any suitable manner as by a belt upon the pulley 24. The shaft 23 car ries a cam 25 between the collars 26 and as this cam rotates it operates to lift the shaft 21 and the table top 7 through the medium of apparatus now to be described. The cam works upon a roller 27 the axis 28 of which extends outwardly on each side through the bifurcated'bearing plate 29 and the lifting arms 30. The plate rests upon the arms and the arms are pivoted to the frame at 3 1. The outer or free ends of the arms 30 are seated on the vertically movable spring supported sleeves 32 which are adapted to slide up and down on the stem or rod 33. The spring 34 below the sleeve 32 rests upon another sleeve 35 which has threaded engagement with the rod 33, as shown, so that upon rotation of the rod by means of the hand Wheel 36 it is possible to raise and lower the outer ends'of the arms 30, the same being at all times cushioned by the springs 34:. In this way thedistance that the cam lifts the table top 7 can be adjusted and the force of the impact on the downward stroke regulated. v

The thrust bearing 37 rests upon the plate 29, above which is the double cup shaped member 38 carrying on its upper face the lower end of the jolting shaft 21, the latter taking the shape of a hollow tube as indicated in Fig. 4. The parts 29, 37, 38, 21, and

'7 are held together in a vertical longitudinal nular ball bearings 47.

The hub 43 carries the gear 48 which is adaptedto mesh with the gear 49 at the top of the rotating shaft 22. .Rotating motion is imparted through the same shaft 23 which raises and lowers the table top 7 by means of the gear 50 at the lower end of the shaft 22, gear 51 onthe shaft 23, sleeve 52 to which the latter is secured and clutch mechanism 53. operated by the hand lever 54.;'

A summary of the operation is as follows:

A mold 5 with its core is secured 'to the table top 7 and guided at the top by the clear the path of the cam 25. may then be thrown in and the table top 7 by centrifugal action.

rollers 94. The shaft 23is rotated-and the table top 7 raised by the cam 25 after which i it drops backtothe pad 44 and thereby jolts the mold. When the-jolting is completed the arms 30 may be sufliciently raised by means of the hand wheel 36 as described to The clutch 53 with the mold which it carriesrotateduntil the centrifugal force compacts the concrete outwardly sutliciently'to free the core 6."

My improved method gives a product of unusual density and strength and'one which although it has had the advantage of a'jolting operation still has-within it a suitable raceway for wiring or piping necessary for lights.

I claim 1. The herein described method of making concrete posts which comprises compacting the concrete in a mold and around a core and then rotating the mold at a speed suflicient to free the core from the concrete 2. The herein descrlbed method of malting concrete posts which comprises moldirg around a core, vertically jolting the mold to. pack the concrete, and rotating the mold at a speed suflicient to free the core from the concrete by centrifugal action.

3. The herein described method of making concrete posts which comprises molding around asubstantially vertical core, jolting in upright position, and rotating at a speed sufficient to free thecorc from the concrete by centrifugal action. 1 1

4. An apparatus for making concrete posts comprising in combination, a mold having a core, means for jolting the-mold to pack the concrete received therein, and means for rotating the mold at a speed suflicient to effect separation of the packed concrete from the core due to the action of centrifugal force.

An apparatus for making concrete posts comprising in combination, a mold having a core, means for supporting and jolting the mold in a substantially vertical position whereby to firmly pack the concrete therein. and separate means for rotating the mold whereby to set up a centrifugal action suflicient'to free the core from the packed concrete. p

6. In concrete post making apparatus the combination of a mold, a table for supporting the mold, means for joltingthe table, and means operable subsequently to the operation of said jolting means for rotating the table. a

7. An apparatus for jolting and rotating a concrete post making mold comprising in combination, a table, acamfor jolting it, means for rotating the cam, a gear drive for rotating the table, and a clutch for connecting said gear drive to the means for rotating the cam.

8.- An apparatus for jolting and rotating a'concrete post making mold comprising in combination, a table, a shaft for jolting it, ashaft for rotating it. a common shaft for actuating both of said first two shafts, means for establishing and disabling the jolting connection. and means for establishing and disabling the rotating connection.

9. Apparatus for'making concrete posts comprising in combination, a mold, a table for supporting the mold in a. substantially vertical position, means for jolting the table, means for rotating it, and means guiding the upper end of the mold without interfering with the jolting and rotating operations.

10. An apparatus for making concrete posts comprising, in combination, a mold,

means for jolting said mold in a substantially vertical direction, an annular member freely surrounding the upper end of said mold and rotatabletherewlth, and a plurality of rollers ,operatively associated with said member for preventing its vertical displacement without interfering with its rotative movement.

1 1. An apparatus for making I concrete posts comprising, in combination, a mold,

means for jolting said mold in a substantimovement, said member and rollers lying ally vertical direction, an annular member in substantially the same horzontal plane, freely surrounding the upper end of said and means for varying the elevation of said mold and rotatable therewith, a plurality of plane. Y

rollers operatively associated with said In testimony whereof, I have hereunto member for preventing its vertical displace signed my name. ment Without interfering with its rotative DAVID B. HANNA.

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