JP5261054B2 - Shelf board holder forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To economically provide a shelf plate holder capable of allowing holding force to act on a shelf plate even if there is a slight thickness error in the shelf plate. <P>SOLUTION: In this shelf plate holder forming method for forming the shelf plate holder G having a holding part 5 capable of holding the edge part of the shelf plate in a thickness direction and a connection part 7 for connecting the mutual base end parts of holding pieces 5A and 5B while forming a recessed part 6 across a pair of the holding pieces 5A and 5B constituting the holding part 5 by a plastic molding method using a mold 11, the mold 11 is constituted so as to be divided into a first mold 11A and a second mold 11B in the depth direction of the recessed part 6 and the temperature of the mold 11 is controlled so that the mold temperature of the first mold 11A positioned on the opening side of the recessed part 6 may become higher than that of the second mold 11B positioned on the bottom side of the recessed part 6 to cast a plastic material in the space between both molds 11 to mold the same. Thereafter, the cast shelf plate holder G is demolded at a naturally shrinkable period. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a technique related to a shelf holder that can be used to attach a shelf to a wall, for example, and more specifically, a sandwiching portion that can sandwich an edge of a shelf in the thickness direction, and sandwiching A shelf board for forming a shelf holder having a connecting portion for connecting the base end portions of the sandwiching piece while forming a recess between a pair of sandwiching pieces constituting the portion by a plastic molding method using a mold about the holder formation how.

Conventionally, as a technique related to this type of shelf holder, as shown in FIG. 7, the separation distance h at which the shelf 2 can be inserted between the pair of sandwiching pieces 5A and 5B constituting the sandwiching portion 5 is increased. And there is a shelf holder 20 that can be attached to the wall 1 with the shelf 2 slightly upward (see, for example, Patent Document 1).
Moreover, the formation method was integrally formed by mold forming (aluminum or the like) (see, for example, Patent Document 1).
However, the thing of the patent document 1 was mentioned as an example made from aluminum, and when a forming material uses the plastic whose intensity | strength is lower than a metal like this case, reinforcement is carried out to the clamping part 5 of FIG. By forming a flange or the like, the strength can be increased without greatly increasing the amount of material used.
By providing flanges, etc., the shape becomes complicated, and in the plastic molding method using a mold, it is possible to use a core or make a three-part mold in consideration of mold removal of the cast product. In this case, however, the cost tends to increase.
Therefore, in order to economically form a shelf holder, it is preferable to use a two-part mold.
In the case of using a two-part mold, a first mold 11A positioned on the opening side of the recess 6 formed between the sandwiching pieces 5A and 5B and a second mold positioned on the bottom side of the recess 6 are used. It is generally implemented using 11B.
In this case, after casting the molten cast material in a state in which both molds 11A and 11B are combined, the cast material is sufficiently cooled while being held between both molds 11A and 11B, thereby removing the mold. Later, deformation due to heat shrinkage is prevented.
At the time of mold removal, both molds 11A and 11B are separated from each other along the depth direction of the recess 6 and removed. Therefore, in order to enable the mold release associated with the demolding, it is essential that the recess 6 is not widened, and the pair of sandwiching pieces 5A, 5B is necessarily parallel or substantially parallel. become.

Japanese Utility Model Publication No. 4-95752 (paragraph number [0008], FIG. 1)

According to the technology related to the conventional shelf holders described above, a two-part mold is used in consideration of economy, but cooling curing is performed while the molten cast material is cast in the mold. Since it is necessary, there is a problem that the restraint time of the mold becomes long and the manufacturing efficiency is low.
In addition, as a product, a pair of clamping pieces are parallel or almost parallel, so that the clamping force can be applied when the thickness dimension of the shelf and the gap dimension of both clamping pieces are the same. However, if it is smaller than the gap dimension of the sandwiching pieces due to an error in the thickness dimension of the shelf board, a gap is formed between the sandwiched portion of the shelf board and the sandwiching piece, and it becomes difficult to exert a sufficient clamping force. There is a problem.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide economically a shelf holder that can exert a clamping force even if there is some thickness error in the shelf. It is in.

  The first feature means of the present invention is that the base portions of the sandwiching pieces are formed while a recess is formed between the sandwiching portion capable of sandwiching the edge of the shelf plate in the thickness direction and the pair of sandwiching pieces constituting the sandwiching portion. In the shelf holder forming method for forming a shelf holder having a connecting portion for connecting the molds by a plastic molding method using a mold, the mold is divided into two in the depth direction of the recess. The temperature control is performed so that the mold temperature of the first mold located on the opening side of the recess is higher than the mold temperature of the second mold located on the bottom side of the recess, After the plastic material is cast in between, the molded shelf holder is removed from the mold when it can be naturally shrunk.

According to the first characterizing means of the present invention, the mold is divided into two in the depth direction of the recess, and the mold temperature of the first mold positioned on the opening side of the recess is the recess. Since the temperature is controlled so as to be higher than the mold temperature of the second mold located on the bottom side, the partial temperature of the product cast between both molds is lower on the opening side of the recess than on the bottom side. It becomes hot and begins to solidify with its temperature gradient.
In addition, since the mold is removed at a time when it can be naturally contracted before sufficient cooling is performed, the product after the mold release undergoes heat shrink deformation due to heat release into the air. At that time, the amount of heat shrinkage tends to be larger at the high temperature side of the product than at the low temperature side.
This phenomenon is also observed within the thickness of the bottom portion of the recess, and as shown in FIG. 5, the shrinkage of the surface on the inner peripheral side of the recess 6 is particularly large at the corner K where the heat capacity is large. Due to the deformation, the pair of sandwiching pieces 5A and 5B is deformed so that the distal end side is closer to the base end side than the base end side, and as a product, the interval between the pair of sandwiching pieces 5A and 5B is constricted. (See FIG. 5B).
As a result, even when the thickness dimension of the shelf board 2 is smaller than a predetermined value, the front ends of the pair of sandwiching pieces 5A and 5B are brought into contact with the front and back surfaces of the shelf board 2 so that sufficient clamping force is applied. Can be made.
And in a manufacturing process, since it removes at an early stage, without implementing curing in a metal mold | die until completion of cooling like the past, it can shorten a manufacturing cycle time.
As a result of the above, it is possible to more economically provide a shelf holder that can exert a clamping force even if there is some thickness error in the shelf.

  The second characteristic means of the present invention resides in that the casting surface portions corresponding to the pair of sandwiching pieces in both the molds are each provided with a drop gradient inclined in the mold release direction.

  According to the second characteristic means of the present invention, in addition to achieving the above-described operation and effect of the first characteristic means of the present invention, the first mold and the second mold are moved in the separation direction. Thus, when the mold is removed, the product is not easily caught, and the mold can be smoothly removed from both cast-in surface portions, and the product can be manufactured more efficiently.

By forming the shelves holder by shelf plate holder forming method according to prior Symbol first or second feature means, distance of each other said pair of holding pieces, the tip than the base end portion side of the clamping pieces It can form what those parts side has become rather small.

According to such a shelf holder, even when the thickness dimension of the shelf is smaller than a predetermined size, the front ends of the pair of sandwiching pieces are in contact with the front and back surfaces of the shelf so that sufficient clamping is achieved. Force can be applied. Of course, even when the thickness dimension of the shelf board is a predetermined value, a more reliable shelf board holding can be achieved by applying a strong clamping force by the pair of clamping pieces to the shelf board.
And since a formation method is the method of the said Claim 1 or 2, manufacturing a shelf holder with the simplest metal mold | die structure, without using a core or using a 3 division | segmentation metal mold | die. The shelf holder can be provided at a low cost.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

  1 to 4 show an embodiment of a shelf holder formed by the shelf holder forming method of the present invention. The shelf holder G is used to attach the shelf 2 to the wall 1. It is configured for use.

The shelf board holder G is formed by a plastic molding method using a metal mold, and the synthetic resin holder body 3 and a synthetic resin cover attached to cover a part of the holder body 3. It comprises a body 4 (see FIGS. 3 and 4).
Any material can be used as long as it can exhibit strength suitable for attaching the shelf 2 to the wall 1, and any type of synthetic resin that meets the requirements can be used.
In this embodiment, as an example, it is made of polycarbonate. It is also possible to increase the strength by mixing reinforcing fibers.

The holder body 3 includes a sandwiching portion 5 capable of sandwiching the edge portion 2a of the shelf plate 2 in the thickness direction and a pair of sandwiching pieces 5A and 5B constituting the sandwiching portion 5 while forming a recess 6 therebetween. It is comprised by integral molding with the connection part 7 which connects 5A, 5B base end parts (refer FIG. 2, FIG. 3).
In addition, a screw insertion hole 8 for attaching the holder body 3 to the wall 1 is provided in each of the connecting portion 7 and the lower holding piece 5B of the pair of holding pieces 5A and 5B ( (See FIGS. 2 and 4).

As shown in FIG. 4, the holding pieces 5A and 5B in the holder main body 3 have a larger protruding amount when attached to the wall 1 in the lower holding piece 5B than in the upper holding piece 5A. It is formed so that
On the other hand, the separation distance h between the pair of sandwiching pieces 5A and 5B is such that the distal end side is smaller than the proximal end side of the sandwiching pieces 5A and 5B, as shown in FIG. It is formed. Specifically, the separation distance h1 on the base end side of both sandwiching pieces 5A and 5B and the separation distance h2 on the distal end side of both sandwiching pieces 5A and 5B are formed so as to satisfy the relationship of h1> h2. ing.
Further, the separation distance h1 on the base end side is set based on the standard thickness dimension of the shelf 2 to be attached. Therefore, when the shelf 2 is received in the recess 6, the tip end sides of both sandwiching pieces 5A and 5B are pushed and expanded by the shelf 2 to be in a substantially parallel state (see FIG. 4). At that time, by the action and reaction, the clamping force by the both clamping pieces 5A and 5B can be applied to the shelf plate 2 and can be held strongly. Even when the shelf 2 is slightly thinner than the standard thickness dimension, the shelf 2 can be held from the front and back by utilizing the elasticity of the sandwiching pieces 5A and 5B.

Further, the pair of sandwiching pieces 5A and 5B show a substantially triangular shape in a side view (see FIGS. 2 and 3), but the inside is formed hollow, and the opening of the hollow portion is formed of a metal mold. It is formed on the opposing surface on the wall side which is the mold drawing direction (see FIG. 4).
A screw insertion hole 9 for fixing the shelf 2 received in the recess 6 is provided in the upper surface portion 5Ba facing the recess 6 in the holding piece 5B on the lower side. Moreover, as shown in FIG. 3, the both-sides edge part of the said upper surface part 5Ba has formed the notch part 10 along the longitudinal direction, respectively. The cover body 4 can be attached to the holder main body 3 by sliding along the notch 10 along the pair of left and right engaging portions 4 a formed on the upper edge portion of the cover body 4.
Note that an engaging portion 5Bb is formed at the lower end portion of the holding piece 5B on the lower side so as to prevent the cover body 4 from coming off when the cover body 4 is attached.

  As described above, the connecting portion 7 has a screw insertion hole 8 for attaching the holder body 3 to the wall 1 (see FIG. 4). Moreover, the groove part 7a is formed in the boundary with the upper clamping piece 5A, and the improvement of the flexibility of the connection part 7 is aimed at. As a result, the flexibility between the sandwiching pieces 5A and 5B is improved, and the shelf board 2 can be held more elastically.

The cover body 4 is formed in a shape that covers the lower holding piece 5B, and, as shown in FIG. 3, the upper edge portion is engaged with the notch 10 of the lower holding piece 5B. The mating engaging portion 4a is formed, and can be attached by engaging the engaging portion 4a with the notch portion 10 while sliding in the direction along the upper surface portion 5Ba.
Further, by engaging the protrusion 4b formed on the lower end portion of the inner peripheral surface of the cover body 4 with the engaging portion 5Bb formed on the lower end portion of the lower holding piece 5B, the cover body 4 is prevented from coming off. It can be attached to the state (see FIG. 4).

Next, a method for forming the shelf holder G will be described. [1-1] A two-part mold 11 is prepared (see FIG. 5).
The mold 11 is divided into two in the depth direction of the recess 6, and the mold temperature of the first mold 11 </ b> A positioned on the opening side of the recess 6 is positioned on the bottom side of the recess 6. The temperature is controlled to be higher than the mold temperature of the mold 11B. Further, the casting surface portions corresponding to the pair of sandwiching pieces 5A and 5B in both molds 11 are each provided with a drop gradient inclined in the mold release direction.
[1-2] From the first mold 11A side, the molten casting material 12 is cast into the casting space between the two molds 11 (see FIG. 5A).
[1-3] In a state where the cast molten casting material 12 is solidified, the molten casting material 12 is demolded before being sufficiently cooled. The removed shelf holder G is naturally cooled without being restricted by the mold, and accordingly, heat deformation is promoted (see FIG. 5B).
The natural cooling after the demolding causes thermal deformation in the direction in which the tip end sides of the pair of sandwiching pieces 5 are close to each other, and settles into a stable shape.

  The shelf holder G can be formed by the above steps.

Further, a shelf mounting procedure using the shelf holder G will be described (see FIG. 1).
[2-1] A plurality of holder main bodies 3 are screwed to the wall 1 at a lateral interval. As shown in FIG. 2, the screws are fixed by inserting screws into the screw insertion holes 8 of the connecting portion 7 and the holding piece 5B on the lower side.
[2-2] The edge 2a of the shelf board 2 is inserted into the recess 6 of each holder body 3, and screws are inserted through the screw insertion holes 9 to fix the shelf board 2 to the holder body 3 (FIG. 3). reference).
[3-3] A cover body 4 is attached to each holder body 3.

According to the technique related to the shelf holder of the present embodiment, the shelf 2 can be easily and quickly attached to the wall 1, and even if there is some thickness error in the shelf 2, A strong holding force by the holding pieces can be applied to the shelf board to achieve more reliable shelf board holding. Furthermore, the screw head can be hidden by attaching the cover body, and the design can be improved.
Moreover, regarding the manufacture of the shelf holder, the shelf holder can be provided more economically because it can be quickly formed with a simple mold configuration.

[Another embodiment]
Other embodiments will be described below.

<1> The shelf holder G is not limited to the one having both the holder main body 3 and the cover body 4 described in the previous embodiment. Also good.
Moreover, although what was used in order to attach the shelf board 2 to the wall 1 was demonstrated, the said shelf board holder G is attached with respect to the shelf board 2, For example, another thing is attached with respect to the shelf board holder G. It is also possible to use it for the purpose of hanging or locking. These are collectively referred to as a shelf holder.
<2> The method for forming the shelf holder is not particularly limited, and may be a plastic molding method using a mold.
Further, the division positions of the first and second molds 11A and 11B may be set to any part as long as they are within the casting space of the product.
<3> The temperature control with the first and second molds 11A and 11B may be performed manually by switching the heater, or of course, automatic control of a computer or the like may be performed.
<4> The mounting posture of the shelf holder on the wall 1 is not limited to the case where the shelf 2 is attached to the center portion of the wall 1 as shown in FIG. There are also cases where it is attached to a corner or a protruding corner. Although not shown in the drawings, the present invention is not limited to attaching a single shelf 2 with a plurality of shelf holders, and can be used to attach a shelf 2 with a shelf holder.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

Partially cutaway perspective view showing the mounting state of the shelf holder The perspective view which shows a holder main body A perspective view showing a shelf holder Side view sectional drawing which shows the attachment state of a shelf holder Side view conceptual cross-sectional view showing the state of casting into and out of mold Top view showing how the shelf board is attached by the shelf holder Side view conceptual diagram showing a conventional shelf holder

Explanation of symbols

2 Shelf 2a Edge 5 Clamping part 5A Clamping piece (upper side)
5B clamping piece (lower side)
6 Concave portion 7 Connecting portion 11 Mold 11A First mold 11B Second mold G Shelf plate holder h Separation distance

Claims (2)

A shelf board having a sandwiching part capable of sandwiching the edge part of the shelf board in the thickness direction, and a connecting part for connecting the base end parts of the sandwiching pieces while forming a recess between a pair of sandwiching pieces constituting the sandwiching part A shelf holder forming method for forming a holder by a plastic molding method using a mold,
The mold is divided into two in the depth direction of the recess,
Temperature control so that the mold temperature of the first mold located on the opening side of the recess is higher than the mold temperature of the second mold located on the bottom side of the recess;
After molding by molding a plastic material between the molds,
A shelf holder forming method in which a cast shelf holder is removed when it can be naturally contracted. 2. The shelf holder forming method according to claim 1, wherein cast-in surface portions corresponding to the pair of sandwiching pieces in the two dies are each provided with a drop gradient inclined in the mold release direction .

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