DE237724C - Forming machine for the production of hollow blocks with only partially continuous channels - Google Patents

Description

IMPERIAL

PATENT OFFICE

The invention relates to a machine for the production of hollow stones with partially continuous channels. The essence of the invention consists in the fact that the gears of the rack and pinion gears intended for the vertical movement of the shaped plate carrying the piercing mandrels are slidably mounted on their W ^T elle and, like the respective racks, are mounted between fork-like sliding guide bridges, whereby the wheels and racks are always kept in engagement will.

In the drawing, for example, the machine is in one embodiment for illustration brought.

FIG. 1 shows a vertical section along the line AB of FIG. 2 together with individual parts in a view;

Fig. 2 leaves the associated plan together with individual parts in section along the line CD of FIG. 1 with the omission of the molding box and pad and

3 shows a section along the line EF of FIG. as well as recognize individual parts in side view.

In the table top α of the machine is a

rectangular opening b is present, which is covered from above by a plate c , but is accessible from below. In this opening can also be a movable in the vertical direction mold plate d with upwardly protruding

"The piercing mandrels e are brought, these protruding through openings in the plate c above the machine table. The hollow form (stamped form) f is placed on the table or plate c , which is partially embedded to limit its position (Fig. 3) .

The movement of the mold plate d in the vertical direction is carried out by a rack and pinion gear. At the end of this plate, downwardly directed toothed racks g attack, the gears h of which are slidably mounted on a shaft which can be rotated by a hand lever k. The gears h are secured against self-rotation on the shaft i by longitudinal keys I. Through guide bridges. m, which overlap both the racks g and the gears h from the sides by means of their legs like a fork, these wheels are secured against axial movement and thus remain in the plane of the racks and in engagement with them. The bridges m are horizontally on rails 0 and can be displaced parallel to themselves and can be fixed on rails 0 in any position. This is not absolutely necessary, however, since the position of the bridges is to a certain extent secured to the extent that they laterally encompass the toothed racks g.

The drive shaft i is mounted between shields p on which the guide rails 0 for the bridges m are also held. The shields p are provided with guide strips q. Between these, on the one hand, the shaped plate d , which is provided with lugs r (FIG. 1) at this point, and, on the other hand, the web rails connecting the toothed racks g at their lower ends. Guide. As a result, a movement of the mold plate d is only possible in a vertical

right direction possible. The drive shaft i is under the action of a control weight t, and the rotational movement of this shaft can be regulated and limited by adjustable stops against which the hand lever k strikes - not indicated in the drawing.

So that the finished hollow stones after removal of the hollow shape (box shape) / free of

ίο can be lifted from the machine table, a base plate u must be placed on plate c before each stone is produced. The piercing mandrels e of the mold plate d are hollow in a known manner and have bores ν at the upper ends through which the air can flow into the channels closed on one side according to the extraction of these cores from the respectively completed stone.

The hollow stones are made in the following way:

When the hand lever k is in the position shown in full lines (FIG. 3), the mold plate d with the piercing pins e assumes the highest position. There are accordingly the piercing mandrels e over the surface of the machine table upwards. The base plate u, which has openings in the area of the piercing mandrels e , is then placed on the plate c and the molding box / is placed on the machine table. As a result, the piercing pins e protrude into the cavity w formed by the molding box /. The artificial stone mass consisting of concrete or the like is then tamped into the molding frame / and evenly painted along the upper molding surface χ. Then the hand lever k is to be moved from the position shown in full lines to the dot-dash position (Fig. 3), the shaft i rotating with the gearwheels h and a downward movement of the toothed racks g with the mold plate d from the one (drawn in solid line) causes in the other (dash-dotted) position. The piercing mandrels e are pulled out of the hollow stone mass downwards, while the air can flow into the channels through the piercing mandrel bores ν in order to maintain the channels formed by means of these piercing mandrels.

Now that the molding box / has been removed, the hollow stone ready for drying can be moved aside by lifting it off with its base plate u by means of hand rails y (FIGS. 1 and 2) carried out through grooves in the plate c under the base plate u.

To make another stone, the hand lever k has to be moved back to bring about the position of the parts drawn in full lines from the dot-dash to the fully extended position (FIG. 3), whereupon the above-described process can be repeated.

If it becomes necessary to replace the mold plate d with plates with different dimensions, in which the distance of the racks g also changes, the latter are set according to the invention after releasing the guide bridges m in the respective required mutual distance. Since the bridges m with their legs η overlap both the toothed racks g and the toothed wheels h like a fork, the latter take part in this movement, so they move on the shaft i and thus remain in the plane of the toothed racks. After the adjustment, the setting bridges m are secured in their positions by screws or the like. Fastening means against intrinsic movement (displacement).

Claims (1)

Patent claim: Molding machine for the production of hollow stones with only partially continuous channels, in which the piercing mandrels are attached to a vertically movable plate, protrude through openings of an interchangeable bottom plate covering them upwards into the molding space and after completion of the hollow stones by means of a hand lever and gearbox downwards are pulled out of the stones again, characterized in that the gears (h) of the rack and pinion gears intended for the vertical movement of the plate carrying the piercing mandrels are slidably mounted on their shaft (i) and with the associated racks (g) by means of fork-like encompassing and displaceable guide bridges (m) kept engaged. For this 1 ^ latt drawings.