US2229618A - Centrifugal casting machine - Google Patents

Description

Jan. 21, 1941. ABELES ETAL 2,229,618

CENTRIFUGAL CASTING MACHINE Filed April 15, 1937 3 Sheets-Sheet 1 Jan. 21, 1941. P, ABELES ETAL CENTRIFEJGAL CASTING MACHINE 5, 1957 3 Sheets-Sheet 2 I Jan. 21, 1941. ABELES ETAL 2 2,229,618

CENTRIFUGAL CASTING MACHINE Filed April 15, 1937 3 Sheets-Sheet 3 Patented Jan. 21, 1941 v UNITED STATES CENTBIFUGAL CASTING MACHINE Paul Abeles, Vienna, and Albert Grimm, Kirchdorf, near Linz, Austria Application April 15, 1937, Serial No. 137,120 In Austria April 17, 1936 1 Claim.

This invention relates to a machine for the manufacturing of beams, pipes, poles, and other hollow bodies from concrete, mortar, and other plastic and hardening masses, by the centrifugal casting method, and has for its main object to enable the known type of friction drive to be employed even in manufacturing tubular elements of considerable length and small diameter, such as poles, beams, and the like, without the occurrence of jolts and irregularities in the work.

A further object of the invention is to provide a machine of the type indicated, which is readily transportable.

A further object of the invention is to facilitate the work of tending the machine.

Still further objects and advantages of the invention will become apparent in the course of the ensuing description.

Forms of construction embodying the invention are shown, by way of example, in the accompanying drawings which form a part of this specification, and in which:

Figs. 1 and 2 show a machine according to the invention, in side elevation and in plan view, respectively.

Fig. 3 is a side elevation of a modified form of construction.

Figs. 4 and 5 show the running ring, in plan view and (on an enlarged scale) in partial side elevation, respectively.

Fig. 6 shows diagrammatically a supporting roller assembly.

Figs. 7, 8, and 9 show modified types of machine according to the invention, in side elevation.

Figs. 10 and 11 show a machine in accordance with the invention, in side elevation and front elevation, respectively.

Referring to Figs. 1 and 2, the octagonal mold I, which consists of two parts, is supported with the running rings 2, the butt joints 3 of which are of special design, upon supporting rollers 4 one of which at the same time serves as a driving roller. The supporting rollers 4 are secured to continuous shafts the bearings of which rest upon girders 6 which are in their turn interconnected by means of longitudinal girders 1. To these latter there are attached uprights 9 upon which there rest supporting beams I Ii for pivoted arms I! which carry pressure rollers 8. Each arm II is pivoted about a spindle I2 secured in the supporting beam III. When the machine is at a standstill, the pivoted arm II with the pressure roller 8 rests upon the supporting beam [0, as shown in chain-dotted lines in Fig.

2. As soon as the mold I rests with its running rings on the supporting and driving rollers I the pivoted arm I I with the pressure roller 8 is swung over into engagement with the spindle l3 secured 5 to the opposite supporting beam. At both supporting points the pivoted arm rests upon powerful compressed springs I 4 which allow of the resilient pressing of the pressure roller 8 upon the running rings 2 pertaining to the mold I. Such springs II are only required, strictly speaking, above the arm II, but it is advisable also to provide similar springs beneath the arm, so as to compensate for any slight variations there may be in the diameter of the running rings. The 15 entire machine is countersunk in the floor of the workshop, in the first place in order not to endanger those at work in the vicinity of the machine, and in. the second place in order to enable the top pressing down rollers 8, which rest upon the running rings 2 pertaining to the mold I, to be placed in position, and removed again, before and after the centrifugal casting operation, and the adjustments necessary for exerting the proper pressure upon the mold to be carried out, conveniently, and on a level with the ground or below the same.

The construction of the machine according to the invention ensures, on the one hand, that sufficient force is applied at the point of contact between the supporting or driving rollers and the running rings on the mold to obtain the degree of friction required for the drive, even when the weight of the charged mold is but relatively r slight, and on the other hand that the molds shall not jump or become lifted from the supporting rollers at high speeds of rotation, and when they are of smaller diameter, with steady and smooth rotation at all times. An advantage of this new arrangement resides further in the fact that, owing to the supporting 0f the mold at three or more points it also becomes possible to employ molds with divided supporting or running rings which do not close quite tightly, withily transportable, and may be erected and set to work with a minimum of trouble wherever it is required, or wherever is most convenient, in the vicinity of where the finished concrete or the like bodies are to be used in building work.

It is also possible to dispense with the uprights 9, and to bolt the girders or beams l down on to the foundation, as shown in Fig. 3 of the drawin s.

ahe arrangement may also be such that the pressure roller 8 with the carriers II in the form of apivoted arm is so mounted as to be not pivotally movable about the spindle l2 but laterally displaceable.

Figs. 4 and 5 show the design of the abutting joint 3 in the divided running ring 2. The overlapping parts of the running ring are slightly champfered off as shown at 2', and this feature has the effect of ensuring a very considerably smoother and more vibrationless running than is attainable with the hitherto known types of abutting Joints in which such champfering or sloping is not provided.

The supporting rollers 4 shown in Fig. 6 are connected with toothed wheels l5 which mesh with a communal intermediate wheel I6, and which serve to improve the drive by providing friction drive at both sides owing to the coupling together of the two supporting rollers 4.

A further modified form of the machine according to the invention is shown in Fig. 7. In,

this machine there are provided only on one side of the machine uprights 9' supporting pivoted and removable arms H which are loaded by means of weights l8 or springs l8, and on which there are mounted the pressure rollers 8. In this manner one side of the machine is rendered completely accessible. The upright 9' is telescopically adjustable in a pedestal 9", so that the machine is adapted to take molds of different diameters. This telescopic adjustability may also be providedin connection with the uprights 9 in the form of construction shown in Fig. 1.

Fig. 8 shows a further possible manner of pressing the roller 8 against the running rings 2 on the mold I. In this case the pressure roller 8 is mounted, on an arm I! which is pivoted either about the longitudinal shaft 5 for the. supporting rollers or upon a separate bearing bracket. The loading or stressing of the pressure roller 8 is effected by means of the weight I8, the connecting cord I9, which is secured to an extension on the arm I1, being arranged to run over the adjustable cord pulley 20 which is mounted on the shorter arm of a bell-crank lever 2|.

' When the machine is to be brought into the inrylng a. roller 21 loaded by a Weight 28.

aaaaore operative condition the lever 2| is tilted in the position 2| so that the weight i8 rests on the foundation. Now the cord 19 is detached from the arm H, which will be swung over in the position indicated in broken lines in Fig. 8. After placing a centrifugal mold I in position on the driving and supporting rollers, the pressure roller 8 is swung over from the position of rest to the operative position, and the cord I9 is made fast to the arm H. The cord pulley carrier 2|, is then tilted outwards, and there arrested at 22 by means of a locking device, so that it can not fall back.

This tilting of the cord pulley carrier has the effect of lifting the weight i8, and this latter then presses the roller 8 against the. outside of the mold or the running ring thereon.

In the modified form of construction shown in Fig. 9 of the drawings there areprovided two pressure rollers 3 attached to arms 23 which are slidable in guide-ways 24, and which take the form of toothed racks. These arms are opera ated by means of toothed wheels 25, whereby they are pressed against the running rings 2 on the mold. To increase the efficiency, it is also possible to arrange for the racks 23 to be not horizontal but downwardly inclined towards the running rings 2 on the mold I, in which case the vertical component of the pressure is increased.

In the form shown in Figs. and 11 the pressure members consist of endless belts, cords, or the like 26 inserted in the mold I and each car- All the iz'gllers 21 may be mounted on a communal shaft We claim:

A machine for the manufacturing of hollow beams, pipes, poles, and other hollow bodies from concrete, mortar, and other plastic and hardening masses, by the centrifugal casting method, comprising a. set of supporting rollers of which at least one is a driving roller, a centrifugal mold bearing upon the same rollers, means for rotating the said driving roller, and means for pressing the mold against the rollers comprising arms pivoted for movement in vertical planes, pressure rollers mounted on the said arms, intermediate the ends thereof, and adapted to bear upon the said mold, flexible traction elements detachably secured to the outer ends of the said arms, and

means for exerting pull on the said traction elements to press the said rollers against the said mold.

PAUL ABELES. ALBERT GRIMM.

Images