JPS5825566B2 - Stair block manufacturing method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for simultaneously manufacturing a plurality of stair blocks.

Stair blocks must have a rough surface, irregularities, or grooves on the top surface to prevent slipping, and the front surface must not be perpendicular to the top surface, but must have a rounded surface, and must meet the requirements of the same school. The front surface should preferably be beautified with patterns, etc., and the connecting part with the lower tier should be recessed.

Such stair blocks have been molded using cast molding or reversal molding machines, but they have the drawback of low efficiency.

The present invention aims to simultaneously manufacture a plurality of stair blocks that meet the above conditions using a manufacturing method and apparatus suitable for undercutting, and can efficiently produce high quality stair blocks.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a plan view of an apparatus suitable for carrying out the invention, and FIG. 2 is a front view thereof.

In the figure, reference numeral 1 denotes a formwork, which is designed to be vibrated by an eccentric rotating shaft 2 or the like.

Reference numeral 3 designates a plurality of protruding rods (five in the figure) which are advanced from the sides of the formwork 1 and inserted into the bottom of the formwork 1.

A notch 4 into which the protruding rod 3 is inserted is provided on the side plate facing the formwork 10.

A press die 6 having a plurality of protrusions 5 for forming grooves on its lower surface is provided above the formwork 1 so as to be movable up and down.

The ones in FIGS. 1 and 2 are embodiments in which two pieces are formed, and in this case, the apex of the central notch 4a and therefore the apex of the central protrusion rod 3, and the central groove forming protrusion 5a. It faces the tip in a vertical plane V.

Unlike the other groove-forming projections 5, the tip of the groove-forming projection 5a may have a somewhat flat surface and a protrusion may be further formed in the center thereof.

7 in FIG. 2 is a receiving plate.

In order to manufacture a stair block using such an apparatus, the receiving plate 7 is placed on the lower surface of the formwork 1, the protruding rods 3 and 3a are inserted and fixed into the lower part of the formwork 1 through the notches 4 and 4a, and then the inside of the formwork 1 is inserted and fixed. Concrete material is put into the mold 6, the mold 6 is lowered, and the concrete material is pressed and molded with the mold 6.

During the above period, the eccentric rotating shaft 2 is rotated to apply vibration to the formwork 1, thereby making the concrete material dense.

After the molding is completed, remove the protruding rods 3, 3a from the bottom of the formwork 1,
The molded product is removed from the mold below the mold 1 while being held between the receiving plate 7 and the mold 6, and is placed on the receiving plate 7 and dried.

(Thus, a forming block as shown in the plan view in FIG. 3 and in the front view in FIG. 4 is obtained.

That is, the forming block has anti-slip grooves 8 and cutting grooves 9 on its upper surface, and a grooved portion 10 on its lower part.

This is cut into two pieces at the cutting groove 9, and each piece is made into a stair block having a shape as shown in FIG.

In FIG. 5, reference numeral 11 indicates the fractured surface, which has an appropriate uneven pattern.

Further, 12 is a cut grooved portion, which is a recess necessary as a lower connection portion.

The stair blocks made in this way are stacked to form stairs as shown in Fig. 6, but each step is safe because anti-slip grooves 8 are formed on each step surface, and the visible front surface has a fractured surface. 11 appears, it becomes a design surface as it is, and furthermore, the recess 12 serves as a relief for toes, etc., making it easier to go up and down the stairs.

As described above, the present invention makes it possible to efficiently manufacture high-quality blocks suitable for stairs, and is extremely useful in practice.

[Brief explanation of drawings]

Fig. 1 is a plan view of the device according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a plan view of the forming block, Fig. 4 is a front view thereof,
FIG. 5 is a front view of the product, and FIG. 6 is an explanatory diagram of the construction mode of the product. 1...Formwork, 2...Eccentric rotating shaft, total
...Protruding rod, 4.4a...Notch, 5,5a
......Protrusion for forming grooves, 6...Press die, 7
・・・・・・Receiving plate, 8・・・Slip prevention groove, 9・・・Cutting groove, 10・・・Grooved part, 1
1...Fracture surface, 12...Dent.

Claims (1)

[Scope of Claims] 1. A plurality of protruding rods for forming grooved portions at the bottom of the block are inserted into the lower part of the formwork, concrete material is poured into the formwork, and groove-forming protrusions are inserted from the upper part of the block. A method for manufacturing a stair block, which comprises: pressing with a pressing die having a mold, demolding after vibration molding, and after drying, breaking and separating the forming block at a position where an upper groove and a lower grooved portion formed in the center of the block face each other. 2. A plurality of protruding rods are provided that advance from the sides of the vibrating formwork and are inserted into the bottom of the formwork, and above the vibrating formwork, a press mold having groove-forming protrusions on the lower surface is arranged to move up and down. An apparatus for manufacturing a stair block, characterized in that the apexes of these protruding rods and at least one pair at the center of the tips of the groove-forming protrusions on the pressing surface face each other in a vertical plane.