JPH0114408Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a fastening device for formwork for forming concrete blocks.

Concrete block formwork is a generally box-shaped formwork in which concrete milk is poured into a cavity through an opening on the top of the formwork and solidified to form a concrete block having a shape corresponding to the shape of the cavity. When demolding a concrete block that has hardened within the formwork, the side plates, end plates, edge plates of the formwork,
It is necessary to open a frame plate such as a partition plate, and various fastening devices are used to attach the frame plate so that it can be opened and closed.

2. Description of the Related Art Conventionally, a frame plate fastening device that has been widely used uses a rotary toggle mechanism as shown in FIG. That is, the rotary piece 51 is rotatably mounted on the frame plate to be opened and closed using the fulcrum pin 52, and the connecting member 54 is connected to the fastening rod 53 whose base end is locked to the frame plate or inner frame facing the frame plate. It is pivotally connected to the rotary piece 51 with a pin 55 through the frame plate, and the frame plate is opened, closed, and fastened by rotating the rotary piece 51 using a suitable operating rod. When the frame plate is closed, the rotation of the rotating piece 51 is stopped at a position where the pin 55 slightly exceeds the bottom dead center of the movement trajectory centered on the fulcrum pin 52 (in the illustrated example, the connecting member 54 is (It is stopped when it comes into contact with the fulcrum pin 52.) The frame plate is firmly fastened using the boosting effect of the toggle mechanism.

Problems that the invention aims to solve A fastening device using such a rotating toggle mechanism has good operability when the formwork is opened and closed manually, and the frame plate can be opened and fastened with a single touch. Although it has its advantages, a problem arises when trying to automatically open and close the formwork in an automated line. In other words, in normal formwork, the fastening device is installed at the center or upper part of the frame plate, so when formwork of different heights coexist and flow on the same line, the height of the fastening device also varies depending on the type of formwork. Therefore, it is necessary to move the operating device for rotating the rotary piece 51 up and down for each formwork for positioning, and the position detection mechanism or device for detecting the position of the fastening device and moving the operating device is required. This complexity has become an obstacle to automating block molding operations.

In view of the above-mentioned problems, this invention was made with the aim of obtaining a fastening device that is particularly suitable for automating the opening and closing of frame plates, and aims to provide a fastening device that uses a direct-acting toggle mechanism. That is.

Structure of the Invention To explain using the reference numerals of the illustrated embodiments, the concrete formwork fastening device of the present invention has proximal ends facing each other in the horizontal direction across a fastening rod 6 that protrudes through a frame plate 5. The tip and base ends of the link 12, which is pivotally connected to the connecting body 15 at the tip of the rod, are connected to the bracket 1 of the frame plate.
A pair of link mechanisms 9, 9 are provided in which the tips of links 11 pivotally connected to each other are pivotally connected to each other,
A receiving portion 20 for pushing the opposing link mechanisms in a direction away from each other is connected to the link 11 or 1.
2 or the connecting portion thereof.

Embodiment FIGS. 1 to 3 are views showing an embodiment of the fastening device according to the present invention, and FIGS. 1 and 2 are plan views showing details of the fastening device during mold closing and mold opening. 3 is a sectional view of a mold for forming a U-shaped groove block provided with the fastening device of the present invention.

In Fig. 3, 1 is the base of the formwork, 2 is the inner frame, 3 is the side plate, 4 and 5 are end plates whose lower sides are pivotally connected to the base 1 and can be opened and closed, 6 is the fastening rod, and 7 is a fastening device. The proximal end of the fastening rod 6 is locked to one end plate 4 via a fitting 8, and the tip protrudes through the other end plate 5, and the fastening device 7 is attached to this projecting portion.

As shown in FIGS. 1 and 2, the fastening device 7 has two link mechanisms 9, 9 arranged horizontally opposite to each other across the protrusion 6a of the fastening rod. 9 is 2 which is pivotally connected by a pin 10.
It has two links 11 and 12. Link 11
The base end of the link 12 is pivotally connected to a bracket 13 fixed to the end plate 5 by a pin 14, and the base end of the link 12 is pivotally connected to a connecting body 15 screwed to the tip of the fastening rod 6 by a pin 16. The link 11 has a projection 17 on the outside of its tip.
18 are provided, and these projecting pieces form recessed receiving portions 19 and 20. 21 is a lock nut screwed onto the fastening rod 6, 22 is a through hole provided in the end plate 5 for passing the fastening rod 6, and 23, 23 shown in phantom lines are operating rods of the automatic opening/closing device. , the operating rod 23 is operated in the vertical direction (the first,
It extends in the direction perpendicular to the paper in Figure 2).

In the mold clamping state shown in FIG.
0 and the operating rods 23, 23 are operated in the direction of separating them from each other, the links 11, 12 open outward, resulting in the mold opening state shown in FIG. 2. In addition, when the operating rod 23 is brought into contact with the receiving portion 19 in the mold opening state shown in FIG. 2 and the operating rods 23, 23 are operated in a direction toward each other, the links 11, 12 are extended and the image shown in FIG. The mold will be in the clamped state as shown. At this time, pin 1
0 moves slightly toward the fastening rod from the line connecting the pins 14 and 16, the tip of the link 11 comes into contact with the fastening rod 6, and the rotation of the links 11 and 12 is stopped, and the links 11 and 12 are toggled. Due to this action, the end plates 4 and 5 are firmly fastened to the inner frame 2 and the side plates 3.

However, when the fastening device of the present invention is used, the fastening device 7 can be pivoted in a fixed position with respect to the formworks 24a and 24b having different heights and therefore different positions as shown in FIGS. The formwork 24a, 2 is operated by the two operating rods 23, 23 that are swung in the direction of the arrow in the figure.
The opening/closing operation of the end plate can be performed for any of 4b. Therefore, such operating levers 23, 23
If an automatic mold opening/closing device with a The end plate can be opened and closed with a single motion, and the structure and control of the automatic opening/closing device can be simplified.

In addition, in an automatic molding line for concrete blocks, the automatic opening device and the automatic closing device for frame plates are installed at different positions, and the fastening device of the present invention requires that the opposing link mechanisms 9, 9 be pinched from both sides during mold clamping. Therefore, a clamping body having an appropriate contact surface is provided in place of the operating rod 23 on the automatic closing device side, and one of the receiving portions 19 formed on the link 11 is not provided. You can also do that. In addition, in the automatic molding line, the formworks 24a, 24
Since b is placed on a conveyor and moved, the insertion of the operating rod 23 into the receiving part 20 in the illustrated embodiment is as follows:
Formwork 24a, 24 toward the operating rod set in a fixed position
This can be done automatically by moving b. Further, the receiving parts 19 and 20 are connected to the link 1
Since it is sufficient to provide the connecting portions 1 and 12 so that they can be pushed, they may be provided on the link 12 on the side of the connecting body 15, and both links 11 and 1
It can also be provided on the pin 10 that connects the two.

Effects of the invention As described above, in the fastening device of the present invention, the frame plate is opened and closed by operating the two link mechanisms installed horizontally across the fastening rod in the direction of approaching and separating each other. By using long operating rods, the frame plate can be opened and closed in the same motion even if the height of the formwork is different. It can be simplified and has the effect of easily enabling automatic molding of concrete blocks.

[Brief explanation of drawings]

Figures 1 to 5 are views showing one embodiment of the present invention, Figures 1 and 2 are plan views showing details of the fastening device at the time of mold clamping and mold opening, and Figure 3 is a diagram showing an embodiment of the present invention. 4 and 5 are cross-sectional views of U-shaped groove block molding forms equipped with fastening devices, and schematically show the relationship between the positions of the fastening devices of formworks of different heights and the operating rods of the automatic mold opening/closing device. FIG. FIG. 6 is a partial sectional view showing a conventional fastening device. In the figure, 4 and 5 are end plates (frame plates), 6 is a fastening rod, and 7
9 is a fastening device, 9 is a link mechanism, 11 and 12 are links, 13 is a bracket, 15 is a connecting body, 20 is a receiving portion, and 23 is an operating rod of an automatic opening/closing device.

Claims (1)

[Scope of utility model registration request] A link which faces horizontally across a fastening rod that protrudes through a frame plate, and whose base end is pivotally connected to a connecting body at the tip of the fastening rod, and whose base end is pivotally connected to a bracket of the frame plate. A pair of link mechanisms are provided in which the tips of the link mechanisms are pivotally connected to each other, and a receiving part for pushing the opposing link mechanisms in a direction away from each other is provided in the link or a connecting part between the links. A fastening device for formwork for forming concrete blocks.