JPH037134Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a formwork for forming cylindrical concrete blocks (hereinafter referred to as "round objects") used for sewage tanks, etc.

In formwork for forming concrete blocks, it is common to open and close the form by rotating the side plate around a pivot provided below, but for formwork for forming round objects, the As shown in Fig. 1, it is composed of a cylindrical core 1 and two side plates 3 and a bottom plate 4 having a semi-cylindrical molding surface 2. The side plates 3 and the bottom plate 4 are separable, and the mold clamping Sometimes, the structure is such that the side plates 3, the bottom plate 4, and the side plates 3 are fastened together using clamps. The reason for this structure is that if the side plate 3 having a semi-cylindrical molding surface 2 is rotated to open and close, the bottom corners 5 of the side plate 3 will come into contact with the molded product. This is because the side plate 3 cannot be opened.

However, with such conventionally structured molds, it takes time to open and close them, placing a heavy burden on the workers, and it is also difficult to mold multiple products at the same time using one mold. There was a drawback.

The present invention has been made with the aim of solving the above-mentioned drawbacks.

Figures 2 to 9 show an embodiment of the formwork of the present invention, Figures 2 to 6 show the mounting structure of the side plates, and Figures 7 to 9 show the mounting structure of the core. This shows the structure.

FIG. 2 is a perspective view of the formwork according to the present invention when the mold is opened, and FIGS. 3 to 6 are enlarged views of the structure of the pivoting portion of the side plate 9. The view in the direction of arrow A in FIG. 3 is FIG. 4, and the view in the direction of arrow B in FIG. 4 is FIG. FIG. 6 shows the state in the middle of opening the mold.

In the figure, 7 is a bottom plate, 8 is a support bracket fixed to the side surface of the bottom plate 7, 9 is a side plate, 9a is at both lower corners thereof, 10 is a bracket extending from the lower end of the side plate 9, and 11 is pivoted to the bracket 10. pivot axis,
Reference numeral 12 represents a horizontally elongated hole provided in the support bracket 8, and reference numeral 13 represents an operating shaft pivotally attached to the support bracket 8.

A pivot shaft 11 pivotally attached to the tip of the bracket 10
is loosely fitted into a long hole 12 provided at the base of the support bracket 8, and a through hole 14 for supporting an operating shaft 13 is provided at the tip of the bracket 8. A link 16 having a pin 15 implanted at its tip is pivotally attached to the pivot shaft 11, and this link 16 and a link 17 fixed to the operating shaft 13 are pivotally attached by the pin 15. . The support bracket 8 has a link 1 when the pin 15 is at a position slightly lower than the line connecting the pivot shaft 11 and the operating shaft 13.
A stopper 18 is provided which abuts on the link 1.
A toggle mechanism is formed by the link 17 and the side plate 9 when the mold is clamped.
The structure is such that the base is fastened. Furthermore, an actuating body 20 having a through hole 19 is fixed to the actuating shaft 13 .

When opening the mold, first insert the handle rod 21 into the through hole 19.
(Fig. 5) and rotate it to the right in the figure, the operating shaft 13 also turns to the right, and the link 17 fixed thereto
also rotates to the right. Therefore, link 17 by pin 15
The link 16 pivoted to the pivot shaft 11 rotates to the left.
moves horizontally along the elongated hole 12 to the right in the figure. This separates the molded product 22 from the base of the side plate 9 (FIG. 6). In this way, the side plate 9
By rotating the rear side plate 9, whose base is separated from the molded product 22, around the pivot shaft 11, the molded product 22 and both lower corners 9a of the side plate 9 will not rub against each other, and the mold can be opened smoothly. It can be performed. The opening angle of the side plate 9 is regulated by a stopper (not shown).

Next, the structure of the core of this example will be explained.

FIG. 7 is a perspective view of the core, FIG. 8 is a longitudinal sectional view of a clamp device used for the core, and FIG. 9 is a front view thereof.

The core 23 consists of a wedge-shaped splitter 24 and a main body 25 that fits into the wedge-shaped splitter. A U-shaped bracket 26 is fixed to the inner peripheral surface of the wide end of the splitter 24, and an operating shaft 27 is mounted on the tip of the bracket 26. An actuating body 29 having a through hole 28 for inserting a handle rod is fixed to the center of the actuating shaft 27, and the upper end of the actuating body 29 is pivoted to a pin 31 implanted in a U-shaped member 30. . A screw rod 33 is screwed onto the base end of the U-shaped member 30 and fixed with a rotation stopper nut 32. The screw rod 33 is rotatable and axially attached to a bracket 36 fixed to the center of a bar 35 that is axially supported between two brackets 34 and 34 respectively provided on the lower inner peripheral surface of the main body 25 that sandwich the splitter. It is attached so that it cannot be moved.

Reference numeral 37 denotes a stopper inserted into the brackets 34, 34, and the bar 35 fitted in the U-shaped notch 41 of the bracket 34 is locked by this stopper 37, so that the stopper 37 can be pulled upward. Therefore, the structure is such that the bar 35 can be removed from the bracket 34 and the splitter 24 can be completely pulled out from the main body 25. Two notches 38 are provided in the inner circumferential surface of the main body 25 in the axial direction.
3 is bent and narrowed at this notch 38. Reference numeral 39 denotes a plurality of L-shaped floating members provided at the lower end of the main body 25. By hooking these floating members 39 to the bottom plate 7, it is possible to remove the core at the same time as removing the molded product. This is what I did. Further, a ring 40 horizontally suspended at the center of the core 23 is a ring spring that biases the main body 25 in the drawing direction.

Next, insertion and removal of the splitter 24 into and out of the main body 25 will be described. When removing the splitter 24, the handle rod is first inserted into the through hole 28, and the operating body 29 is rotated to the right in FIG. 8 to move the splitter 24 upward. The splitter 24 has a wedge shape with a wider upper part, so when the splitter 24 is moved upward, the core body 25 is squeezed and its diameter becomes smaller, so there is no space between the core 23 and the molded product. The clearance necessary for deforming is formed. Further, when assembling the core, when the handle rod is inserted into the through hole 28 and the actuating body 29 is rotated in the reverse direction, the splitter 24 resists the biasing force of the ring spring 40 as the actuating body 29 rotates, and the main body 25
It will be inserted into. The rotation of the actuating body 29 is controlled by the pin 3.
1 slightly passes the line connecting the actuating shaft 27 and the bar 35, the actuating shaft 27 and the inner surface of the U-shaped member 30 come into contact and stop, and a toggle mechanism by the actuating body 29 and the U-shaped member 30 causes the actuating shaft 27 to stop. Wariko 24
Clamping is completed. Core 2 with this structure
3 can be squeezed with one touch, so if used in the formwork of the present invention, the formwork for round objects can be opened and closed more easily and quickly.

As described above, the present invention is a concrete block molding form having a structure in which the side plate 9 is opened and closed by rotating around the pivot shaft 11 provided at the bottom thereof, and the pivot shaft 11 is attached to the support bracket 8 in the horizontal direction. An operating shaft 13 that is movably supported and parallel to the pivot shaft 11 is pivoted at a fixed position, and the pivot shaft 11 and the operating shaft 13 have two links 16 and 17 forming a toggle mechanism. When demolding the molded product, the actuating shaft 13 is rotated in a direction in which the two links 16 and 17 are bent in an F-shape, and the base of the side plate 9 is moved outward. The feature is that the mold is opened by rotating the rear side plate 9 around the pivot shaft 11, and since interference between the side plate base and the molded product can be avoided when the mold is opened, it is possible to In the formwork, it is possible to adopt a structure in which the side plates are opened and closed by rotating them around the pivot axis, making it easy to perform multiple pieces, and the horizontal movement of the side plates and the fastening and opening of the side plate bases are easy. Since they are performed simultaneously in one operation, the formwork can be opened and closed with a single touch, which reduces the burden on the operator and improves concrete block forming efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional mold for molding round objects, FIGS. 2 to 6 are views showing an embodiment of the present invention, and FIG. 3
The figure is an enlarged sectional view of the main part showing the mounting structure of the side plate.
The drawings are a view in the direction of arrow A in FIG. 3, FIG. 5 is a view in the direction of arrow B in FIG. 4, and FIG. 6 is a side view of the side plate attachment part in a state in the middle of opening the mold. Figures 7 to 9 are diagrams showing the structure of the core, where Figure 7 is a perspective view of the core, Figure 8 is a longitudinal sectional view showing the structure of the clamp device, and Figure 9 is a perspective view of the core.
The figure is a front view of the same. In the figure, 8 is a support bracket, 9 is a side plate, 9a is a corner thereof, 10 is a bracket, 11 is a pivot shaft, 1
2 is a long hole, 13 is an operating shaft, 14 is a through hole, 15 is a pin, 16 and 17 are links, 18 is a stopper, 19
2 is a through hole, and 20 is an actuating plate.

Claims (1)

[Scope of Claim for Utility Model Registration] In a formwork for forming a concrete block having a structure in which the side plate is opened and closed by rotating around a pivot shaft provided at the bottom thereof, the pivot shaft moves in a horizontal direction perpendicular to the axis of the support bracket. An operating shaft that is freely supported and parallel to this pivot shaft is pivoted in a fixed position, and the pivot shaft and the operating shaft are connected via two links that form a toggle mechanism. At the time of demolding, the two links are rotated in the direction of bending into an F-shape, the base of the side plate is moved outward, and the rear side plate is rotated around the pivot axis to open the mold. A formwork for forming concrete blocks, which is characterized by: