JPS5816814Y2 - Fasteners for formwork for forming concrete products - Google Patents

Description

[Detailed description of the invention] This invention relates to a fastener for formwork for forming concrete products.

A formwork for forming concrete products consists of one bottom plate (or inner frame), two side plates, and two end plates, and the products formed within the formwork are made by opening the side plates and end plates. taken out.

In the past, screws were used to assemble the various parts that make up the formwork, but in recent years, crank-type one-touch fasteners have been developed to efficiently assemble and remove the formwork. has come to be used.

Figures 1 and 2 show a formwork using such a one-touch fastener, with end plates 2 and 3 pivotally attached to the bottom plate 1.
A rotating body 4 is pivotally attached to one side 2 of the rotating body 4, and the eccentric point 5 of this rotating body 4 is
and the other end plate 3 are connected by a tension frame 6, and a stopper 7 provided on the rotating body 4 is connected at a position immediately after the eccentric point 5 exceeds the bottom dead center (the dead center of the side to which the end plate 3 is pulled). The end plates 2 and 3 are fastened in this state so that the tension frame 6 comes into contact with the rotor 4 and the rotating body 4 is self-locked.・・・
...10 to be locked and fastened.

Note that 11 is a handle for rotating the rotating body 4, and phantom lines 2 a , 3 a , B a , and ga indicate the states of the end plate and side plate when the formwork is opened.

In such a conventional crank-type fastener 12, if the stroke is to be increased, the diameter of the rotating body 4 must be increased, which not only increases the size of the device but also deteriorates stability in the self-locking state. This problem arises.

The purpose of this invention is to provide a fastening device that can obtain a large tightening stroke without increasing the diameter of the rotary body 4, and the purpose of this invention is to provide a fastening device that can obtain a large tightening stroke without increasing the diameter of the rotating body 4. The fastener connects the eccentric point of the rotating body and the tip of the tension frame with a link that is connected with pins at both ends, and is provided with a stopper that regulates the amount of relative rotation between this link and the rotating body, so as to move the rotating body in the fastening direction. The link is configured so that it is wound around the rotating body when rotated, and
The present invention is characterized in that a stopper is provided for stopping the rotation of the rotating body at a position immediately after the pivot point between the tip of the tension frame and the link adjacent thereto exceeds the bottom dead center.

Hereinafter, a detailed description will be given based on the illustrated embodiment.

3 to 5 show a first embodiment of this invention, in which 13 is a rotating body, 14 is a pin installed at an eccentric position of the rotating body 13, 15 is a link, and 16 is a tension member. Rod, 1
7 is a pin that pivotally connects the link 15 and the tension rod 16; 18 is the shaft of the rotating body 13; and 19, shown in phantom lines, is a bracket that supports the shaft 18; 19 is fixed to one end plate 2, the other end of the tension rod 16 is pivotally connected to the other end plate 3, and the handle 11 is attached to the shaft 18.
is provided.

The rotor 13 is provided with a recess 20 to avoid interference with the tension rod 16, and when the bottom 21 of the recess 20 and the tension rod 16 come into contact, rotation of the rotor 13 is stopped. In addition, the relative rotation amount between the link 15 and the rotating body 13 is regulated by the stopper 22 provided on the rotating body 13 coming into contact with the pin 17. .

The fastener configured as described above can be moved from the extended state shown in FIG. 4 (the state in which the mold is opened) to the state a in FIG. l), c
After passing through the state shown in FIG. 5, the fastened state shown in FIG. 5d is reached.

Fig. 5a shows a state in which the link 15 is being pulled by the rotation of the rotating body 13, b shows a state when the stopper 22 and pin 17 are in contact, and Fig. 5C shows a state in which the tension rod 16 is pulled by the stopper 22. The tension rod 16 is in the state immediately after the pin 17 crosses the bottom dead center of the crank mechanism (the point at which the pin 17 is at the right end in the figure) of the crank mechanism, which apparently consists of the rotating body 13 and the tension rod 16. Bottom 21 of recess 20 provided in rotating body 13
When they come into contact with each other, the rotation of the rotary body 13 is stopped, resulting in the fastened state shown in d.

In this fastened state, the formwork clamping force acting on the tension rod 16 provides a moment that tends to rotate the rotating body 13 clockwise in the figure, so the fastener is self-locked.
The fastened state of the formwork is maintained.

In the first embodiment described above, the link 15 is located outside the rotating body 13 to avoid interference between the rotating body 13 and the link 15, but as shown in the second embodiment of FIG.
Interference between the link 15 and the rotating body 13 can also be avoided by bending the arm of the link 15.

In this case, the outer peripheral surface of the rotating body 13 and the inner circular arc surface of the link 15 come into contact with each other, so that the link 15 and the rotating body 1
The amount of rotation with respect to 3 is regulated.

In this way, the stopper for regulating the amount of relative rotation between the link 15 and the rotating body 13 and the stopper for stopping the rotation of the rotating body 13 are specially formed for that purpose. There is no need for such a stopper, and the rotating body 13 or the tension rod 16 itself can be used as a stopper.

Furthermore, a link 15 connecting the rotating body 13 and the tension rod 16
is not necessarily limited to one.

7 and 8 show two links 15a, 15
b), by rotating the rotating body 13 clockwise in the figure, the extended state shown in FIG. 7 passes through the states a, l), and c in FIG. becomes.

The amount of rotation between the rotating body 13 and the link 15a is
The pin 17a that pivotally connects the link 15b to the rotating body 1
3 (Fig. 8a).
), the amount of rotation between link 15b and rotating body 13 is
5b and the tension rod 16 is the rotating body 13.
It is regulated by being received in a recess 23 provided on the outer peripheral surface of the (FIG. 8C).

As mentioned above, in the fastener of this invention, after the link connecting the rotating body and the tension rod is wound up, the rotating body and the tension rod form a crank mechanism. It is possible to increase the stroke of the tension rod without increasing the diameter of the body, and it is possible to reliably fasten and open a formwork with a large opening/closing stroke in one operation.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an example of a formwork for forming concrete products having a conventional fastener structure, with FIG. 1 being a longitudinal sectional view and FIG. 2 being a plan view. 3 to 8 show embodiments of the fastener according to this invention, in which FIG. 3 is a plan view of the first embodiment, FIG. 4 is a side view of the first embodiment, and FIG. 5 is a side view of the first embodiment. The figures are diagrams showing the operation of the first embodiment, Figure 6 is a side view of the second embodiment, Figure 7 is a vertical sectional view of the third embodiment, and Figure 8 is a diagram showing the operation of the third embodiment. It is. 1... Bottom plate (inner frame), 2.3... End plate, 8, 9... Side plate, 13... Rotating body,
14...Pin, 15...Link, 16
...Tension rod, 17...Pin, 20...
... recess, 21 ... bottom of recess, 22 ...
...Stopper, 23...Recess.

Claims (1)

[Scope of utility model registration request] The tip of a tension frame whose base end is pivotally connected to one end plate is connected to a pin provided at an eccentric position of a rotating body that is pivotally connected to the other end plate, and the rotating body is rotated to rotate the opposite end plates. In the fasteners of formwork for forming concrete products, which open and close the
A pin provided at an eccentric position of the rotating body and the tip of the tension frame are connected via one or more links, and this link, the tip of the tension frame, and the plurality of links are connected to each other by a rotatable pin. The structure is such that the relative rotation amount between the link and the rotating body is regulated and the link is wound around the circumferential surface of the rotating body when the rotating body is rotated in the closing direction. , the rotating body rotates at a position immediately after the pivot point between the tension frame and the adjacent link passes the bottom dead center, which is on the extension of the pivot point at the base end of the tension frame and the pivot point of the rotating body. A fastening tool for formwork for forming concrete products, characterized in that it is provided with a locking member for stopping movement.