Level adjusting plate for concrete product

Abstract

[Problem] The thickness of a plate body is conventionally limited by the height of positioning projections. [Solution] Locking projections (2, 2a) are provided so as to protrude from a surface of one lateral portion (1a) of a plate body (1), and locking holes (3, 3a) are formed through the other lateral portion (1b). Pins (4, 4a) having the same height as the locking projections (2, 2a) are provided so as to protrude from a surface of the other lateral portion (1b), and pin holes (5, 5a) are formed through the one lateral portion (1a). The plate body (1) is configured such that, when rotated by 180 degrees about the center thereof, positioning within the regions of the locking holes (3, 3a) and the pin holes (5, 5a) can be achieved. Accordingly, when stacking two plate bodies, if an upper plate body is rotated by 180 degrees in a horizontal direction relative to a lower plate body and the locking projections (2, 2a) and the pins (4, 4a) of the lower plate body are inserted into the locking holes (3, 3a) and the pin holes (5, 5a) of the upper plate body, an upper surface of the lower plate body comes into surface contact with a lower surface of the upper plate body, thereby enabling the plate bodies to be used in a stacked state irrespective of the thickness of the plate body (1).

Description

Level adjustment plate for concrete products

[0001] The present invention relates to a level adjustment plate for concrete products, which is installed on the installation surface of concrete products when laying concrete products on site.

[0002] Conventionally, when laying concrete products such as side ditches and box culverts on site, the concrete products are laid on the installation surface constructed by pouring concrete. However, since the installation surface is uneven, it is necessary to adjust the level of the concrete products. For this reason, the level adjustment was performed by stacking one or more rectangular plates at the bottom of the concrete products to the required thickness.

[0003] As this level adjustment plate, for example, a pair of positioning protrusions are provided on the surface of the plate body, and fitting holes are provided on the back surface of the plate body corresponding to the positioning protrusions. When stacking, the positioning protrusions are fitted into the fitting holes to facilitate the positioning of the upper one. A level adjustment plate for concrete products can be found (see, for example, Patent Document 1).

[0004] Japanese Utility Model Laid-Open No. 7-40912

[0005] However, in the above prior art, since the fitting holes are formed on the back side of the positioning protrusions, there are problems that need to be solved, such as the upper surface of the upper one cannot be made to contact the upper surface of the lower one during use unless the thickness of the plate body is made thicker than the height of the positioning protrusions.

[0006] In view of the problem in the above-mentioned prior art in which the thickness of the plate body is limited by the height of the positioning protrusions, the present invention has a rectangular plate body, at least two latching protrusions projecting from the surface of one lateral portion of the plate body relative to the center line, the same number of latching holes formed through the other lateral portion of the plate body relative to the center line, at least two pins projecting from the surface of the other lateral portion of the plate body, and a pin hole formed through the one lateral portion of the plate body, wherein the latching protrusions have a hook portion at the tip of an elastically deformable rising portion A hooking projection is provided inwardly at the lower part of the hooking hole, which engages with the hook portion. The positions of the hooking projection and the pin are set so that when the plate body is rotated 180 degrees around its center, they can be positioned within the area of ​​the hooking hole and the pin hole. This solves the above problem by allowing the two plates to be stacked and used with the upper surface of the lower plate in contact with the lower surface of the upper plate, regardless of the thickness of the plate body, when stacking them by rotating the upper plate 180 degrees horizontally relative to the lower plate and inserting the hooking projection and pin of the lower plate into the hooking hole and pin hole of the upper plate.

[0007] In short, the present invention comprises a rectangular plate body, at least two latching projections projecting from the surface of one lateral portion of the plate body relative to the center line, the same number of latching holes formed through the other lateral portion of the plate body relative to the center line, at least two pins projecting from the surface of the other lateral portion of the plate body, and pin holes formed through the one lateral portion of the plate body. The latching projections have a hook portion formed at the tip of an elastically deformable rising portion, and a latching projection that engages with the hook portion is projected inward from the lower part of the latching hole, and the positions of the latching projections and pins are set so that they can be positioned within the area of ​​the latching holes and pin holes when the plate body is rotated 180 degrees around its center, so when stacking for level adjustment, the upper plate is rotated 180 degrees horizontally relative to the lower plate. Furthermore, by inserting the lower latching projection and pin into the upper latching hole and pin hole, the upper surface of the lower item comes into contact with the lower surface of the upper item, allowing the upper item to be easily positioned relative to the lower item. The stacked state is always neatly arranged without the upper item shifting relative to the lower item, and the stacked state will not easily collapse due to the concrete product being lowered, making level adjustment work easy. Even if the thickness of the plate body is thinner than the height of the latching projection and pin, and the tips of the latching projection and pin protrude above the upper plate body, they are still lower than the latching projection and pin of the upper item, so they can be used without problems. When stacking for boxing, by bringing the latching projection and pin of the lower item into contact with the lower surface of the upper item, they can be kept parallel to each other, allowing for smooth boxing.

[0008] Relief holes for the latching projections are formed on both sides of the latching projections in the plate body, and relief holes for the pins are formed on both sides of the pins. The distance between the centers of the latching projections and the relief holes for the latching projections, and the distance between the centers of the pins and the relief holes for the pins are the same. Therefore, by repeatedly shifting the upper plate in the width direction relative to the lower plate, and then shifting the upper plate in the opposite direction relative to the lower plate, the plates can be stacked in a zigzag pattern. By repeatedly inserting the lower latching projections into the relief holes for the upper latching projections on the opposite side of the shifting direction, and inserting the lower pins into the relief holes for the upper pins on the opposite side of the shifting direction, the stacked plates are always neatly stacked without the upper plate shifting relative to the lower plate, resulting in a very large practical effect, such as enabling smooth boxing.

[0009] This is a plan view of Embodiment 1 of the concrete product leveling plate according to the present invention. This is a bottom view of the leveling plate in Figure 1. This is a plan view showing two leveling plates of Embodiment 1 stacked together when in use. This is a cross-sectional view taken along line A-A in Figure 1. This is a cross-sectional view taken along line B-B in Figure 3. This is a cross-sectional view showing two leveling plates of Embodiment 1 stacked together when packaged. This is a diagram showing the state of use of the leveling plate of Embodiment 1. This is a plan view of Embodiment 2 of the concrete product leveling plate according to the present invention. This is a bottom view of the leveling plate in Figure 8. This is a plan view showing two leveling plates of Embodiment 2 stacked together when in use. This is a cross-sectional view taken along line C-C in Figure 8. This is a cross-sectional view taken along line D-D in Figure 8. This is a cross-sectional view taken along line E-E in Figure 10. This is a cross-sectional view taken along line F-F in Figure 10. This is a plan view showing an example of three leveling plates of Embodiment 2 stacked together when packaged. This is a cross-sectional view taken along line G-G in Figure 11. This is a cross-sectional view taken along line H-H in Figure 12. This is a diagram showing the state of use of the leveling plate of Embodiment 2.

[0010] The leveling plate according to the present invention is used as a single plate or by stacking multiple plates (preferably two plates). It basically has a rectangular plate body 1, at least two latching protrusions 2, 2a protruding from the surface of one lateral portion 1a of the plate body 1 relative to the center line L1, the same number of latching holes 3, 3a formed through the other lateral portion 1b of the plate body 1 relative to the center line L1, at least two pins 4, 4a protruding from the surface of the other lateral portion 1b of the plate body 1 relative to the center line L1, and pin holes 5, 5a formed through the one lateral portion 1a of the plate body 1 relative to the center line L1. The positions of the latching protrusions 2, 2a and pins 4, 4a are set so that they can be positioned within the area of ​​the latching holes 3, 3a and pin holes 5, 5a when the plate body 1 is rotated 180 degrees around its center.

[0011] The latching projections 2, 2a are arranged symmetrically with respect to a center line L2 that is perpendicular to the center line L1 of the plate body 1, and hook portions 7, 7a are formed at the tips of the elastically deformable rising portions 6, 6a.

[0012] The latching holes 3, 3a are arranged symmetrically with respect to the center line L2, and at the bottom, latching protrusions 8, 8a are provided that protrude inward to engage with the hook portions 7, 7a of the latching projections 2, 2a, and the lower opening is formed so that the latching projections 2, 2a can pass through while being deformed.

[0013] Then, by rotating the plate body 1 180 degrees at its center, the rising parts 6, 6a can be positioned within the area of ​​the lower opening in the locking holes 3, 3a.

[0014] Pins 4 and 4a are the same height as the latching projections 2 and 2a and are arranged symmetrically with respect to the center line L2.

[0015] The pin holes 5 and 5a are arranged symmetrically with respect to the center line L2, allowing the pins 4 and 4a to be inserted from below.

[0016] Figure 1 is a plan view of Embodiment 1 of the concrete product leveling plate according to the present invention, Figure 2 is a bottom view of the leveling plate of Figure 1, Figure 3 is a plan view showing two leveling plates of Embodiment 1 stacked together when in use, Figure 4 is a cross-sectional view taken along line A-A in Figure 1, Figure 5 is a cross-sectional view taken along line B-B in Figure 3, and Figure 6 is a plan view showing two leveling plates of Embodiment 1 stacked together when packaged.

[0017] The plate body 1 has numerous holes 10, 10a, etc. formed at appropriate locations throughout, and finger grips 11, 11a are recessed on the long side. In the drawing, these finger grips 11, 11a are formed so that they do not extend from the top surface to the bottom surface in the thickness direction, but they may be formed to extend to the bottom surface, although this is not shown in the drawing.

[0018] The latching projections 2 and 2a are arranged in sets of four, with arc-shaped wall-shaped upright portions 6 and 6a positioned on the same circumference, and hook portions 7 and 7a are formed on the outer surfaces of the tips of the upright portions 6 and 6a.

[0019] The locking holes 3, 3a are circular holes into which all four locking projections 2 and 2a can be inserted, and the lower part is surrounded by locking protrusions 8, 8a that protrude inward.

[0020] Pins 4 and 4a have spherical rounded ends, while pin holes 5 and 5a are circular holes slightly larger in diameter than those of pins 4 and 4a.

[0021] When stacking multiple plates during use, as shown in Figures 3 and 5, the upper plate is rotated 180 degrees horizontally relative to the lower plate, the lower latching projections 2 and 2a are inserted into the upper latching holes 3 and 3a, and the lower pins 4 and 4a are inserted into the upper pin holes 5 and 5a, the hooks 7 and 7a of the latching projections 2 and 2a are engaged with the latching protrusions 8 and 8a of the latching holes 3 and 3a, the lower surface of the upper plate body 1 is brought into contact with the upper surface of the lower plate body 1, and then, as shown in Figure 7, the concrete product W is installed by placing it on the installation surface GL.

[0022] Figure 8 is a plan view of Embodiment 2 of the concrete product leveling plate according to the present invention, Figure 9 is a bottom view of the leveling plate in Figure 8, Figure 10 is a plan view showing two leveling plates of Embodiment 2 stacked together when in use, Figure 11 is a cross-sectional view from D-D in Figure 8, Figure 12 is a cross-sectional view from E-E in Figure 8, Figure 13 is a cross-sectional view from F-F in Figure 10, Figure 14 is a cross-sectional view from G-G in Figure 10, Figure 15 is a plan view showing an example of three leveling plates of Embodiment 2 stacked together when packaged, Figure 16 is a cross-sectional view from G-G in Figure 15, and Figure 17 is a cross-sectional view from H-H in Figure 15.

[0023] The plate body 1 has holes 10, 10a ... and finger rests 11, 11a, similar to the first embodiment described above.

[0024] The latching projections 2 and 2a each consist of one pair, with hook portions 7 and 7a formed on the inner surface of the tips of the longitudinally elongated rising portions 6 and 6a of the plate body 1.

[0025] The latching holes 3, 3a are rectangular in shape, elongated in the longitudinal direction of the plate body 1, and latching protrusions 8, 8a are provided projecting inward from the lower part of the outer wall surface.

[0026] Pins 4, 4a and pin holes 5, 5a are formed in the same manner as in the first embodiment described above.

[0027] Relief holes 12 and 13 for the latching projection are formed on both sides of the latching projection 2 in the plate body 1, and relief holes 12a and 13a for the latching projection are formed on both sides of the latching projection 2a. Relief holes 14 and 15 for the pin are formed on both sides of the pin 4 in the plate body 1, and relief holes 14a and 15a for the pin are formed on both sides of the pin 4a. As shown in Figures 11 and 12, the distance between the centers of the latching projection 2 and the relief holes 12 and 13, the distance between the centers of the latching projection 2a and the relief holes 12a and 13a, the distance between the centers of the pin 4 and the relief holes 14 and 15, and the distance between the centers of the pin 4a and the relief holes 14a and 15a are all the same dimension H.

[0028] When stacking multiple plates during use, as shown in Figures 10, 13, and 14, the upper plate is rotated 180 degrees horizontally relative to the lower plate, the lower latching projections 2, 2a are inserted into the upper latching holes 3, 3a, and the lower pins 4, 4a are inserted into the upper pin holes 5, 5a, the hooks 7, 7a of the latching projections 2, 2a and the latching protrusions 8, 8a of the latching holes 3, 3a are engaged, the lower surface of the upper plate body 1 is brought into contact with the upper surface of the lower plate body 1, and then, as shown in Figure 18, the concrete product W is installed by placing it on the installation surface GL.

[0029] When stacking during boxing, as shown in Figures 15-17, the upper item should be oriented in the same direction as the lower item and offset in the width direction, and then the upper item should be shifted to the opposite side relative to the lower item, and this process is repeated to stack them in a zigzag pattern. At that time, insert the lower locking projection 2 into the upper locking projection relief holes 12 and 13 on the opposite side of the shifting direction (in the drawing, the inner locking projection relief hole 12 of the second stage and the outer locking projection relief hole 13 of the third stage), and insert the other locking projection 2a into the upper locking projection relief holes 12a and 13a on the opposite side of the shifting direction (in the drawing, the outer locking projection relief hole 13a of the second stage and the inner locking projection relief hole 12a of the third stage), insert one of the lower pins 4 into the upper pin relief holes 14 and 15 on the opposite side of the shifting direction (in the drawing, the inner pin relief hole 14 of the second stage and the outer pin relief hole 15 of the third stage), and insert the other lower pin 4a into the upper pin relief holes 14a and 15a Insert the pieces into the opposite side of the offset direction (the outer pin relief hole 15a of the second row and the inner pin relief hole 14a of the third row in the diagram) and stack the predetermined number of pieces.

[0030] Furthermore, the shapes of the holes 10, 10a, etc. in the plate body 1 of the above embodiments 1 and 2 are not limited to those shown in the figures, and may be omitted.

[0031] Furthermore, it is preferable that the leveling plates according to the present invention include multiple plates with different thicknesses, and that when in use, an appropriate number of plates (preferably two) can be stacked to achieve the desired thickness.

[0032] 1. Plate body 2. 2a. Hooking projection 1a. One side portion 1b. Other side portion 3. Hooking hole 4. 4a. Pin 5. 5a. Pin hole 6. 6a. Rising portion 7. 7a. Hook portion 8. 8a. Hooking projection 12. 13. Relief hole for hooking projection 14. 15. Relief hole for pin L1. Center line

Claims

1. A concrete leveling plate comprising a rectangular plate body, at least two latching projections projecting from the surface of one lateral portion of the plate body relative to the center line, the same number of latching holes formed through the other lateral portion of the plate body relative to the center line, at least two pins projecting from the surface of the other lateral portion of the plate body, and pin holes formed through the one lateral portion of the plate body, wherein the latching projections have a hook portion formed at the tip of an elastically deformable rising portion, and a latching projection that engages with the hook portion is projected inward from the lower part of the latching hole, the height of the latching projections and pins is lower than the thickness of the plate body, and the height of the latching projections is set so that a gap is formed between them and the latching projection when inserted from the upper opening of the latching hole, and the positions of the latching projections and pins are set so that they can be positioned within the area of ​​the latching hole and pin hole when rotated 180 degrees around the center of the plate body.

2. The concrete product leveling plate according to claim 1, characterized in that relief holes for the latching projections are formed on both sides of the latching projections in the plate body, and relief holes for the pins are formed on both sides of the pins, and the distance between the centers of the latching projections and the relief holes for the latching projections, and the distance between the centers of the pins and the relief holes for the pins are the same.

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