JPH0411083B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention [Field of Industrial Application] The present invention relates to an inner mold for manufacturing molded products from cement, synthetic resin, clay, etc. This invention relates to an expandable and retractable inner mold that is easy to take out.

[Conventional technology]

BACKGROUND ART Conventionally, an inner mold used for manufacturing a molded product is known to be composed of a plurality of members bolted together so that they can be disassembled and reassembled in order to facilitate removal of the molded product. However, when disassembling and assembling such conventional inner molds, workers must release and fasten bolts inside the inner molds, and the inner molds must be disassembled into smaller pieces in several parts. There was a problem in that it had to be extracted, and the workability was extremely poor.

Therefore, for example, as described in Japanese Patent Publication No. 58-20764, there are two types of wedge-shaped formwork members whose width is reduced from top to bottom (hereinafter referred to as reduced width formwork) and wedge-shaped formwork members whose width is expanded from top to bottom (hereinafter referred to as reduced width formwork). An expandable and retractable inner mold is known in which a sliding surface connects a widening formwork to a widening formwork.

[Problem to be solved by the invention]

However, in the above-mentioned expandable inner mold, when taking out the molded product after producing the molded product, the inner mold and the molded product are brought into close contact by removing the outer mold and lifting the widening formwork with a crane. The molded product was moved together with the inner mold to another location, and then the reduced-width formwork was lifted up by a crane, the inner mold was reduced in width, and then removed. The inner mold extracted in this way is moved to a predetermined position in order to manufacture a molded product again, and after the widening formwork is grounded on the bottom mold, the narrowing formwork is allowed to fall under its own weight, and finally the reduced width formwork is dropped under its own weight. It was installed on the bottom mold by tightening the through bolts provided on the width formwork.

Therefore, there was a problem in that a large working space was required when extracting the inner mold, and a crane had to be provided to cover the working space, which required large-scale equipment. In addition, since the molded product and the inner mold are lifted at the same time, the load on the crane becomes large, resulting in a problem that a crane with greater lifting capacity is required compared to lifting only the molded product.

Furthermore, when the molded product is brought into close contact with the inner mold and lifted, it is pressed from the inside.
There was a fear that damage such as cracks would occur in the molded product, and in some cases, the molded product would burst. In particular, when a molded article is manufactured using a brittle molding material such as clay, there is a problem in that productivity is reduced due to damage to the molded article.

Further, when reinstalling the inner mold after taking out the molded product, skill is required for crane operation and positioning work, and the through bolts must be finally tightened, which poses a problem in improving productivity. In other words, if you just set the reduced width formwork in a predetermined position,
Because it lacked stability simply because it was standing under its own weight, it had to be fixed with through-bolts. This is an unavoidable problem because the inner mold is formed by the narrowed formwork and the widened formwork. In addition, although this inner mold can be used for manufacturing cylindrical molded products, there is a problem in that it cannot be used for manufacturing box-shaped molded products.

Structure of the Invention The present invention has been made after intensive efforts to solve these problems, and employs the following structure.

[Means to solve the problem]

That is, the gist of the present invention is as follows: A first wedge-shaped formwork member installed on a bottom mold and whose width is reduced from top to bottom, and a second wedge-shaped formwork member whose width is widened from top to bottom. The first wedge-shaped formwork member and the second wedge-shaped formwork member are connected to each other via a slidable sliding surface, and the vertical relative positional relationship of both wedge-shaped formwork members is changed. By doing so, the expandable and contractible inner mold is connected to the first wedge-shaped form member on a vertical line passing through the center of gravity of the first wedge-shaped form member, and the first wedge-shaped form member is connected to the bottom of the wedge-shaped form member. The inner mold is characterized in that an actuator that can push up or pull up the mold in the vertical direction and lower or push it down in the vertical direction is attached to the center of the bottom mold either directly or through an intervening member.

[Effect]

According to the inner mold of the present invention, when the inner mold is installed on the bottom mold, the actuator moves the first wedge-shaped mold member downward, so that the first wedge-shaped mold member and the second wedge-shaped mold member are connected to each other. The wedge-shaped form member can be moved in the width-widening direction, and the inner mold can be brought into a state in which molded products can be manufactured. At this time, the second wedge-shaped formwork member is grounded on the bottom mold from the beginning, and even during width reduction, which will be described later, it will slide horizontally within a predetermined range with respect to the bottom mold. , positioning on the bottom mold is not required.

Next, when the molded product is manufactured, the actuator moves the first wedge-shaped mold member upward, thereby reducing the width of the inner mold. As a result, a gap is created between the molded product and the inner mold, and the molded product can be easily taken out. At this time, the second wedge-shaped formwork member is moved in the inner mold width reduction direction while being grounded on the bottom mold, and after taking out the molded product, the first wedge-shaped formwork member is moved by the actuator as described above. When the inner mold is moved downward, the width of the inner mold is widened again and the molded product can be manufactured. Here, when the inner mold is brought into a state in which it is possible to produce a molded product again, the second wedge-shaped formwork member remains in the state of being grounded on the bottom mold as described above, so the bottom mold can be manufactured without any positioning. It reliably moves on the mold to the widening position again.

Here, the actuator is configured to actively push up and pull down (or pull up and push down) the first wedge-shaped formwork member, and the actuator is configured to actively push up and pull down (or pull up and push down) the first wedge-shaped formwork member at the center of the bottom mold. Since the configuration is such that vertical pushing-up force and pulling-down force (or pulling-up force and pushing-down force) are applied directly to the center of gravity, there is no risk of the type of sway occurring as in the case of wire hanging.

Therefore, according to the inner mold of the present invention, vertical movement can be performed stably.

In addition, in the present invention, by being able to actively pull down (or press down), the first wedge-shaped formwork member can be firmly attracted (or pressed) to the bottom mold, and the inner mold can be automatically positioned. Can be combined and fixed. Therefore, the inner mold can be stably set at an appropriate position relative to the bottom mold without adopting a structure such as fixing with a through bolt.

Note that when the inner mold of the present invention is used to manufacture a box-shaped molded product, the box-shaped molded product is pushed up from above the bottom mold by the amount of rise of the first wedge-shaped frame member,
When taking out the molded product, there is no need to separate the bottom mold from the molded product, and the molded product can be taken out very easily.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings.

Figures 1 and 2 show the entire formwork in which the inner mold of the present invention is housed, Figures 3 A to C show the bottom mold, and Figure 4 shows the bottom mold.
Figures A and B show the inner mold in the expanded width state, Figures 5 A and B show the inner mold in the reduced width state, Figure 6 A to C show the movable side plate, and Figure 7 A and B show the mold. A space adjustment member for adjusting the space between the upper parts of the frame is shown in FIG. 8, and a fixing mechanism for the lower part of the movable side plate is shown in FIG.

In this embodiment, the inner mold of the present invention is applied to a molding frame for a cement molded product for a box culvert waterway, and the molding frame 1 includes a bottom mold 10 and an inner mold 30 installed on the bottom mold 10. , an outer mold 50 disposed on all sides of the bottom mold 10 so as to surround the inner mold 30, and an actuator 70 disposed on the bottom mold 10 for expanding and contracting the inner mold 30.

The bottom mold 10 has rail members 11 arranged in parallel.
a, 11b, girder members 13a to 13c arranged in an H-shape at the center of the rail members 11a and 11b, and a bottom having a cross-sectional shape as shown in FIG. It consists of a formwork 14. The bottom formwork 14 consists of a bottom plate 15 having an octagonal opening in plan as shown in FIG.
7a and 17b, and a top plate 19 that is bent to form a fitting step at the lower end of the molded product 100. In addition, the inner plate 17
A groove 21a for fitting a packing material is provided on the entire upper circumference of the outer plate 17b, and a similar groove 21b is provided on the upper part of the side perpendicular to the rail members 11a and 11b of the outer plate 17b. Further, the top plate 19 is connected to the lower ends of side plates 51a, 51b forming the outer mold 50 at sides parallel to the rail members 11a, 11b.

The inner mold 30 includes a pair of first wedge-shaped form members 31a, 3 which are arranged opposite to each other and whose width is reduced from top to bottom.
1b, and first wedge-shaped formwork members 31a, 31b.
and a pair of second wedge-shaped form members 33a, 33b which are disposed next to each other and widen from top to bottom, and a sliding surface is formed between each wedge-shaped form member. That is, the first wedge-shaped formwork member 31
Sliding plates 35a to 35d are provided on both side edges of a and 31b.
are vertically protruding from the peripheral surfaces 36a, 36b toward the inside of the inner mold 30, and similarly, sliding plates 37a to 37d are provided to the second wedge-shaped form members 33a, 33b.
are provided, and each sliding plate 35a-35d, 37a-
A sliding surface is formed by 37d.

Here, each of the sliding plates 37a to 37d is provided with four elongated slide holes 39 on the center line, and a slide that passes through the sliding plates 8a to 35c and the sliding plates 37a to 37c and slides inside the slide holes 39. Piece 4
1 are fixed to predetermined positions of each of the sliding plates 35a to 35c by four bolts. Slide piece 41
A sliding roller 43 is provided at the penetrating end of each of the rollers 43 and is slidable on the sliding plates 37a to 37c.

Further, the actuator 70 is bolted onto the girder member 13c, as shown in FIG.
is located at the center of The actuator 70 is a hydraulic cylinder, and the upper end of the rod 71 is connected to the link 45 between the first wedge-shaped formwork members 31a and 31b.
The arm member 47 is pivotally connected to the lower surface of the center of the arm member 47 via a pin. Although not shown, hydraulic pressure is supplied to the actuator 70 from a hydraulic power source via a hydraulic pipe led to the outside of the forming frame 1 through an opening provided in the beam member 13a or 13b.

Next, the outer mold 50 will be explained. The outer mold 50 is
The side plate 51 has its lower end connected to the bottom mold 10 as described above.
a, 51b, and movable side plates 51c, 51d movable along the rail members 11a, 11b.

The movable side plates 51c and 51d are made of plate material 52,
Lower frames 55 each having two wheels 53 are provided on the left and right in the lower part, and struts 57 are erected at the ends of the lower frames 55, respectively. The upper part of the support column 57 is provided with a swing shaft 59 disposed so as to span between the support supports, and a swing lever 6 is provided at the end of the swing shaft 59.
1 is provided. As shown in FIG. 6B, the swing shaft 59 is cut at the center of the support column 57, and the cut portion is connected to the swing shaft 59 by an eccentric shaft 63 eccentric to the swing shaft 59. .

One end of a link 65 is pivotally supported on the eccentric shaft 63, and the other end of the link 65 is pivotally supported at a predetermined position on the plate member 52. Further, although the plate material 52 is suitably reinforced with a reinforcing material, it is provided with a non-reinforced portion 67 at the bottom as shown in the figure. As will be described later, the non-reinforced portion 67 acts as a hinge portion when the swing lever 61 is operated.

Note that the side plates 51a and 51b also have the same configuration as the movable side plates 51c and 51d, except for the configuration of the wheels 53. Furthermore, an upper die 80 is provided at the top of each of the side plates 51a to 51d to form a fitting stepped portion at the upper end of the molded product 100 so that the molded products fit together when forming a waterway with the molded product 100. It is being

A spacing adjustment member 90 is disposed at the upper end of the inner mold 30. The spacing adjustment member 90 includes a rod 91 whose one end is swingably supported at the upper end of the inner mold 30;
It consists of a presser arm 93 screwed onto the free end of the rod 91 with a nut, and a tightening arm 95 pivotably supported on the free end of the presser arm 93.
As shown in the figure, the presser arm 93 is provided eccentrically upward relative to the axis of the rod 91, and has a bent shape with its free end below the axis. A support shaft 97 is supported on the bent tip so that the center of the support shaft 97 is below the axis of the rod member 91. Further, the free end of the tightening arm 95 is provided with a notch 101 for hooking a hooking rod 99 provided at the upper end of the outer mold 50 as shown in the figure, and a swinging lever 103 is provided at the end on the side of the support shaft 97. It is provided.

As shown in FIG. 7A, the notch 101
9 is hooked, by swinging the tightening arm 95 in the interval adjustment direction (counterclockwise in the figure), the holding arm 93 and the tightening arm 95 clamp the hooking rod 99 on the axis of the rod 91. possible.

Next, the effects achieved by each configuration will be described in accordance with the procedure for manufacturing the molded product 100 using the molding frame 1 and taking it out.

First, the assembly of the molding frame 1 will be explained. As mentioned above, the bottom mold 10 has a roughly opening-shaped recessed part in the center, and the inner mold 30 is accommodated in the recessed part. 30 outer wall surface and inner plate 17a of bottom formwork 14
The inner mold 30 is brought into a state in which the molded product 100 can be produced by being brought into close contact with the inner mold 30 through the packing material. At this time, the actuator 70 acts to move the first wedge-shaped formwork members 31a, 31b downward, and as the actuator 70 moves downward, Second
The wedge-shaped formwork members 33a and 33b are moved in the width-widening direction. At this time, the second wedge-shaped formwork member 3
3a and 33b are in a state of being grounded on the girder members 13a to 13c in advance, and since the actuator 70 is installed at the center of the bottom mold 10, it comes into close contact with the bottom mold 14 without any alignment. moved to position. Here, by configuring the part corresponding to the bottom of the bottom mold 10 with the girder members 13a to 13c, the ground contact area of the second wedge-shaped frame members 33a and 33b is small, so that the ground contact part during expansion/contraction movement is Frictional force is small, and the above-mentioned operations are performed smoothly.

Next, the outer mold 50 is assembled. Moving side plate 5
1c and 51d are moved to predetermined positions, and the adjacent side plates are tightened with the clamps 109. At this time, the side plates 51a to 51d are tightened and assembled in a state perpendicular to the bottom mold 10, as shown by solid lines in FIG. 6A. still,
At this time, the swing lever 61 is moved in the direction of the arrow in FIG.
By swinging the movable side plate 51d to a position adjacent to the side plates 51a and 51b with the movable side plate 51d tilted as shown by the two-dot chain line in the figure, and then swinging the swing lever 61 in the direction opposite to the arrow shown in the figure. , side plate 51
The upper die 80 can be press-fitted between a and 51b for alignment. As shown in FIG. 2, the upper mold 80 has both side ends tapered at the upper part of each side plate 51a to 51d, and the side plate 51a is formed in the above procedure.
51d are assembled, positioning can be easily performed by the action of adjacent upper molds 80.

Further, the lower portions of the movable side plates 51c and 51d are connected to the eighth
As shown in the figure, it is provided with a tightening member 110 similar to the interval adjusting member 90, and for the similar configuration, the rod 91 is replaced by a rod 111, which is numbered by adding 20 to the member numbers shown in FIGS. 7A and 7B. , and detailed explanation will be omitted. Note that, unlike the interval adjustment member 90, the right end of the rod 111 in the figure is slidable via a pin 127 on a slide member 125 provided on the lower frame 55, and the tightening arm 115 has a notch. First, direct hook bar 119
It is pivoted on. When tightening, the swing lever 113 swings in the direction of the arrow in the figure, so that the pin 127 slides on the slide member 125 and is guided to the hook 129 provided at the bottom of the bottom form frame 14. It is configured to tighten between the hook 129 and the hook bar 119.

As described above, the bottom mold 10, the inner mold 30, and the outer mold 50
is assembled in the predetermined position, the spacing adjustment member 90
Thus, the distance between the inner mold 30 and the outer mold 50 is maintained at a predetermined value. Incidentally, although not shown in the drawings, in this embodiment, the interval adjusting member is attached to each of the wedge-shaped frame members 31a, 31.
A total of eight pieces are provided, two on each corner of the inner mold 30, and two on each corner of the side plates 51a to 51d.

Next, the production and removal of the molded product 100 will be explained based on FIGS. 4A and 4B.

First, the molding frame 1 assembled as described above
A molding material such as cement is injected into the molding space. Thereafter, the molding material is solidified after a predetermined period of time has elapsed, and a molded product 100 is manufactured as shown in FIG. 4B.

Next, the interval adjusting member 90, the clamp 109, and the tightening member 110 are all released, and the movable side plates 51c and 51d are moved to a position where the molded product 100 can be taken out. At this time, the upper mold 80 and the molded product 10
The top surface of the plate member 52 and the side surfaces of the molded product 100 are in close contact with each other. Therefore, in order to facilitate the above-mentioned movement, the movable side plate 52 is tilted in advance by operating the swing lever 61 to tilt the plate 52 around the non-reinforced portion 67 to eliminate the above-mentioned close contact state.
c and 51d to a position where the molded product 100 can be taken out. In addition, other side plates 51a, 51
By tilting b in the same way, the molded product 10
0 and the outer mold 50 are released.

Next, by driving the actuator 70 and pushing up the arm 47, the link 4
At 5, the first wedge-shaped frame members 31a and 31b connected to the arm 47 are pushed upward.
Along with this, the slide piece 43 is inserted into the slide hole 39.
, and the second wedge-shaped form members 33a, 33b are moved toward the center of the inner mold 30 by an amount corresponding to the slope of the sliding surface. At the same time, the first wedge-shaped form members 31a and 31b also move toward each other due to the action of the link 45, and the inner mold 30
As a whole, the width is reduced around the actuator 70. As a result, a gap is formed between the molded product 100 and the inner mold 30, and the molded product 100 can be easily taken out by a crane or the like.

After that, when manufacturing a molded product again, follow the above-described assembly procedure of the molding frame 1 to assemble the actuator 70, movable side plates 51c, 51d, and swing lever 6.
1 is operated, the interval adjustment member 90 and the clamp 10
9. Each mold can be easily and reliably assembled in a predetermined positional relationship by the tightening member 110.

Here, the effects of the interval adjusting member 90 adopted in this embodiment will be explained in FIGS. 9A to 10C.
This will be explained in more detail based on the figures.

Since the spacing adjustment member 90 is configured as described above, when adjusting the spacing between the formworks, first hook the hooking rod 99 at the notch 101 as shown in FIG. Swing lever 10
Operate 3. Then, the outer mold 50 is moved in a direction approaching the inner mold 30. As shown in Figure 9B,
The support shaft of the rod 91 and the support shaft 97 of the tightening arm 95
The distance between the inner mold 30 and the outer mold 50 becomes the smallest when the swing lever 103 is swung to the position where the hook bar 99 is in a straight line. Thereafter, the swinging lever 103 is further operated, and the hooking bar is positioned above the line D-D in the diagram and is held between the presser arm 93 and the tightening arm 95, as shown in FIG. 9C. . Here, by operating the swing lever 103 from the state shown in FIG. 9A to the state shown in FIG. When it is tightened, it will be pushed back by Δd as shown in the figure.

Further, the clamp 109 is oscillated to press the adjacent side plates 51a to 51d from the outside to the inside so that their vertical sides are brought into strong contact with each other.

As a result, due to the action of the interval adjustment member 90, the upper parts of the side plates 51a to 51d cannot enter inward from that position, and due to the action of the clamp 109, the upper parts of the side plates 51a to 51d cannot be moved inwardly.
The central portions a to 51d do not expand outward beyond that position.

The force relationship acting on the outer mold 50 when cement or the like is injected between the outer mold 50 and the inner mold 30 is shown in FIG. 10.

That is, the outer mold 50 is subjected to a force that tries to spread outward due to the pressure p of the cement, but in the center part the clamp 109 prevents the spread and an inward reaction force F2 is generated, while in the upper part the space adjustment member 90 acts as a tension rod and the outward reaction force F1
, and an outward reaction force F3 also acts on the lower end. Since these elements maintain a balanced relationship, the balanced relationship of the outer mold 50 during the production of a molded product is considered to be like that of an inwardly convex beam as shown in the figure.
As a result, the center portion of the outer mold 50 does not swell.

Further, since the tightening arm 95 is set beyond a so-called dead point, the length of the interval adjusting member 90 does not change in response to a horizontal load.

In addition, even if a horizontal load is applied to the clamp 109, it will not be swung either.
Therefore, an excessive load is not applied to the tightening member 110, and the outer mold does not bulge outward, and especially when molding a long object, the inner and outer molds 3 are prevented from being applied as shown in this embodiment.
0.50 can be tightened using the interval adjustment member 90, and there is no need to fix a bulge-preventing band or the like to the outer periphery of the outer mold 50, making it possible to manufacture molded products with high precision in an extremely simple manner. .

As explained above, according to the molding form 1 of this embodiment, by arranging the actuator 70 at the center of the bottom mold 10, each wedge-shaped form member 31
a, 31b, 33a, and 33b are moved to predetermined positions without eccentricity during both width expansion and width reduction, allowing smooth work. In addition, if a slight hydraulic pressure is applied so that the actuator 70 acts in the direction of expanding the width of the inner mold during the production of the molded product, the wedge-shaped formwork members 31a, 3
1b, 33a, 33b are the inner plates 17 of the bottom formwork 14
a, and can reliably prevent the molding material from entering the inner mold 30. Therefore, the above-mentioned contact portion does not need to be processed with high precision, and the manufacturing of the inner mold is simplified. Furthermore, a second wedge-shaped formwork member 33a,
33b is always grounded on the bottom mold 10, so there is no fear that the sliding surface will wobble or shift during expansion/contraction operations, and the sliding surface does not have recesses and protrusions as in the past. There is no need for fitting, which simplifies the manufacture of the inner mold. As a result, the inner mold 30 can be easily and reliably installed at the molded product production position, and the molded product can be easily taken out, without requiring a large-capacity crane or a large work space. Further, since movement is restricted by the bottom mold 14, the inner mold 30 will not be erroneously widened when taking out the molded product, and damage such as cracks will not occur to the molded product. As a result, both workability and productivity can be improved.

In addition, the outer mold 50 is composed of a plurality of side plates 51a to 51d including movable side plates 51c and 51d, and each side plate 51a to 51d is configured to be able to take a tilted position and an upright position by a swing lever 61.
The detachment operation of the outer mold 50 becomes extremely easy, and
When assembling the outer mold 50, the existence of the tapered portion of the upper mold 80 allows easy and accurate positioning.

Furthermore, the interval adjustment member 90 can prevent the outer mold 50 from bulging or shifting, allowing the molded product to be manufactured with high precision.

Although one embodiment of the present invention has been described above, the present invention is not limited to this in any way, and various embodiments can be adopted without departing from the gist thereof.

For example, the actuator 70 is not limited to a hydraulic cylinder, but may be an electric cylinder. Further, the actuator 70 does not have to be arranged at the center of the bottom mold 10,
For example, it may be disposed on the arm 47 side, or when disposed on the bottom mold 10, it may straddle the arm 47.
For example, a gate-shaped structure may be provided, and the arm 47 may be disposed so as to be pulled up from the bottom of the gate-shaped structure and pushed down. Furthermore, a top plate, a sheet member, etc. may be placed on the top surface of the inner mold and used to manufacture a box-shaped molded product. It can also be released from the mold, making it easy to take out. Moreover, the first wedge-shaped formwork member and the second wedge-shaped formwork member are each one,
In other words, the inner mold is not limited to being divided into four parts, but may be divided into two parts, three parts, etc. In such a case, it would be unbalanced and dangerous to hang it with a crane as in the past, but according to the present invention, there is no danger at all. Furthermore, it goes without saying that it can be divided into many parts.

Effects of the Invention As explained above, according to the inner mold of the present invention, it is easy to take out the molded product, and the installation of the inner mold can be carried out extremely easily and accurately during the production of the molded product and when it is to be remanufactured after being taken out. Further, the crane for taking out molded products does not require excessive capacity, and the work space can be small. Furthermore, even if cracks occur in the molded product or a brittle molding material is used, the molded product can be removed without bursting. As a result, workability and productivity are greatly improved, and
It does not require excessive incidental equipment and brings extremely beneficial effects.

Further, the actuator is configured to be able to actively push up and down (or pull down and push up) the first wedge-shaped formwork member, and the center of gravity of the first wedge-shaped formwork member is at the center of the bottom mold. Directly in the vertical direction, upward force and downward force (or upward force and downward force)
Because of this structure, the first wedge-shaped form member can be moved up and down stably without the risk of the mold shaking as in the case of wire suspension. Then, firmly pull (or press) the first wedge-shaped formwork member onto the bottom mold.
Automatic alignment and fixation of the inner mold is possible. Therefore, the inner mold can be stably set at an appropriate position relative to the bottom mold without adopting a structure such as fixing with a through bolt.

According to the present invention, it is possible to handle a molded product that is completely different from the inner mold described in Japanese Patent Publication No. 58-20764, and the inner mold shakes in relation to the molded product. There are no problems such as scratches, and when it comes to the relationship with the bottom mold, it eliminates the troublesome work of positioning using crane handling, and the troublesome work of fixing with through bolts afterwards. It has the extremely remarkable effect that it can also be made unnecessary.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of the molding frame of the example.
2 is a partially cutaway plan view, FIG. and (B) are a perspective view and a cross-sectional view illustrating the state of the inner mold during production of a molded product, FIG. A is a front view of the movable side plate, B is an explanatory view of the main part explaining its tilting mechanism, C is a sectional view taken along line B-B, and FIGS. FIG. 8 is a front view showing the tightening member, and FIGS. 9A to 10C are explanatory diagrams illustrating the function of the interval adjusting member. 1... Molding frame, 10... Bottom mold, 30... Inner mold, 31
a, 31b...first wedge-shaped formwork member, 33a,
33b...Second wedge-shaped formwork member, 35a to 35
d, 37a-37d...Sliding plate, 50...Outer mold, 70
...actuator, 80...upper mold, 90...interval adjustment member, 100...molded product, 110...tightening member.

Claims (1)

[Claims] 1. A first part installed on the bottom mold and whose width is reduced from top to bottom.
wedge-shaped formwork member and a second part widening from top to bottom.
a wedge-shaped formwork member, the first wedge-shaped formwork member and the second wedge-shaped formwork member are connected to each other via a slidable sliding surface, and the wedge-shaped formwork members are In an inner mold that can be expanded and contracted by changing the relative positional relationship in the vertical direction, the inner mold is connected to the first wedge-shaped form member on a vertical line passing through the center of gravity of the first wedge-shaped form member; An actuator capable of pushing up or pulling up the wedge-shaped formwork member vertically with respect to the bottom mold and lowering or pushing it down in the vertical direction is attached to the center of the bottom mold either directly or through an intervening object. Internal mold.