JP3614299B2 - Anti-sink structure of synthetic resin products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-sink structure for a synthetic resin product.
[0002]
[Prior art]
As shown in FIG. 2, in the case where at least two parts of the front side part A and the back side part B intersect, the conventional synthetic resin product is molded with the same thickness on the front side part A and the back side part B. Since the wall thickness is increased at the intersection, a difference occurs in the cooling time from the surface to the center of the surface side portion, and sink marks C are generated on the surface of the surface side portion A at the intersection, making it unsightly. In order to prevent this, the thickness T of the front surface side portion A is formed larger than the thickness t of the back surface side portion to prevent the occurrence of sink marks as much as possible.
The larger the difference between the thickness T of the front surface side portion A and the thickness t of the back surface side portion B, the greater the distance L from the surface of the intersection of the back surface portion B and the front surface portion A to the center of the intersection. Since the distance l from the surface of the surface side portion A to the center of the plate thickness was approached, the difference in cooling time was reduced and the occurrence of sink marks was reduced.
[0003]
However, the back surface portion B needs to have sufficient strength and durability, such as being connected to other members, or contacting the cabinet body, such as a drawer front plate, to stop the closing operation of the drawer. For this reason, when the thickness of the back surface side portion B is increased, the thickness of the front surface side portion A inevitably increases, leading to an increase in material costs and processing time, resulting in high costs. It was.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide an anti-sink structure for a synthetic resin product that has a simple structure, a low material cost, a short processing time, and can be manufactured at low cost.
[0005]
[Means for solving the problems]
Therefore, in order to solve the above-mentioned problems, the present invention is configured as a first means. In a synthetic resin product having two parts intersecting at substantially the same thickness, a reinforcing rib is provided between the front side part and the back side part. In addition to the formation, a groove where the thickness of the back surface portion is reduced is formed on the opposite side of the reinforcing rib at the intersection of the front surface portion and the back surface portion.
[0006]
Further, the second means of the present invention is a synthetic resin drawer front plate comprising a front plate and a peripheral frame integrally formed with a rear opening at the back surface peripheral portion of the front plate. The plate and the surrounding frame have almost the same thickness, a reinforcing rib is formed between the lower tongue piece and the front plate of the surrounding frame, and the groove where the thickness of the lower tongue piece becomes thinner is reinforced at the intersection of the front plate and the lower tongue piece. It is formed on the opposite side of the rib.
[0007]
【Example】
Hereinafter, the present invention will be described in detail based on examples.
FIG. 1 is a partially enlarged view of a synthetic resin product according to a first embodiment of the present invention. The surface side portion D and the back surface side portion E are formed to have the same thickness and intersect with each other. A triangular reinforcing rib F having a thickness about half that of the portion D is provided, and the thickness of the back surface side portion E is provided on the back surface portion E opposite to the reinforcing rib F at the intersection of the front surface portion D and the back surface portion E. A groove G having a thickness of 60% is formed.
[0008]
That is, since the dimension J from the surface of the intersection of the back surface portion E and the front surface portion D to the center H of the intersection approaches the dimension j from the surface of the surface portion D to the thickness center H, the cooling time Since the difference between the gaps is reduced and the occurrence of sink marks can be prevented, the reinforcing rib F is formed on the opposite side of the groove G between the front surface side portion D and the back surface side portion E. Can be prevented.
[0009]
3 to 5 show a second embodiment in which the present invention is implemented with a drawer front plate made of synthetic resin.
Reference numeral 1 denotes a synthetic resin front plate that is detachably attached to a back plate 3 provided at the front end of the drawer main body 2, which is arranged to be movable back and forth with respect to a main body such as a cabinet.
[0010]
The front plate 1 has an inclined guide portion 11 that deepens upward in the center of the front surface, and a handle lead-out hole 12 formed at the upper end of the inclined guide portion 11, and the front plate 13 that is curved in an arc shape in the left-right direction. And a peripheral frame 5 that is formed to protrude rearward on the left, right, upper, lower, and rear surfaces of the front plate 13 and has an opening at the rear.
[0011]
The peripheral frame 5 has left and right tongue pieces 51 and 51 formed at the left and right end portions of the front plate 13 and a locking protrusion 521 at the rear end formed at the upper end portion of the front plate 13. The upper tongue piece 52 is formed at the lower end portion of the front plate 13 and slightly above the front plate 13, and the lower tongue piece 53 has the connecting hole 531 of the back plate 3 at a predetermined position at the rear end portion.
[0012]
Reference numerals 14 and 14 denote rotating shaft center support protrusions which rotatably hold the rotating shaft 20 of the latch device together with the back plate 3, and reference numerals 15 and 15 rotatably hold the left and right ends of the rotating shaft 20. Rotating shaft left and right support projecting pieces are shown. Reference numeral 16... Denotes a reinforcing rib formed at a predetermined position of the lower tongue piece 53 and the lower end of the front plate 13. Reference numerals 17 and 17 denote the lower tongue piece 53 and the front. A support protrusion of the latch spring 200 formed at a central portion of the lower end of the plate 13 with a predetermined interval on the left and right is shown.
[0013]
And the groove | channel 4 by which the thickness of the lower tongue piece 53 becomes thin is provided in the lower surface of the front end part of the lower tongue piece 53 (intersection part of the front plate 13 and the lower tongue piece 53), and the occurrence of sink marks on the front plate is prevented. ing.
That is, by making the dimension from the surface of the intersection of the lower tongue piece 53 and the front plate 13 to the center of the intersection close to the dimension from the surface of the front plate 13 and the center of the plate thickness, and reducing the difference in cooling time, Sinks occurring on the surface of the front plate 13 are prevented as much as possible.
[0014]
【The invention's effect】
According to the first aspect of the present invention, in the synthetic resin product having two portions intersecting at substantially the same thickness, a groove in which the thickness of the back surface portion is reduced is formed at the intersecting portion of the front surface portion and the back surface portion. As a result, the dimension from the surface of the intersection of the back side portion and the surface side portion to the center of the intersection is close to the surface of the surface side portion and the center of the plate thickness, so the difference in cooling time is reduced. Sinking can be prevented, and at the same time, a reinforcing rib is formed on the opposite side of the groove between the front side portion and the back side portion, so that the strength reduction of the back side portion due to the formation of the groove can be prevented. Can be made the same thickness as the back side portion, and material costs and processing time can be reduced, and synthetic resin products can be manufactured at low cost.
[0015]
Furthermore, according to the invention described in claim 2, in the front plate made of a synthetic resin comprising a front plate and a peripheral frame integrally formed with a rear opening at the back surface peripheral portion of the front plate, the front plate and the periphery The frame has almost the same thickness, and the groove where the thickness of the lower tongue piece becomes thinner is formed at the intersection of the front plate and the lower tongue piece. From the surface of the intersection of the lower tongue piece and the front plate to the center of the intersection The size of the plate approaches the size from the front plate surface to the center of the plate thickness, the difference in cooling time is eliminated, and the occurrence of sink marks on the front plate surface can be prevented. Since the reinforcing rib is formed on the opposite side of the groove, it is possible to prevent the strength of the lower tongue piece from decreasing, the thickness of the front plate can be made the same as the thickness of the surrounding frame, and the material cost can be reduced. The processing time can be shortened and it can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a partially enlarged view of a synthetic resin product according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a conventional example. FIG. 3 is a sectional view of a second embodiment. Part enlarged view [FIG. 5] MM line reduced view of FIG.
D Front side portion E Back side portion F Reinforcement rib G Groove H Intersection 1 Front plate 13 Front plate 16 Reinforcement rib 2 Drawer body 3 Back plate 4 Groove 5 Surrounding frame 53 Lower tongue piece

Claims (2)

In a synthetic resin product having two parts intersecting at substantially the same thickness, a reinforcing rib is formed between the front side part and the back side part, and the thickness of the back side part is at the intersection of the front side part and the back side part. An anti-sink structure for synthetic resin products, characterized in that a groove of 60% is formed on the opposite side of the reinforcing rib. In the synthetic resin drawer front plate consisting of a front plate and a peripheral frame that is integrally formed with a rear opening on the back surface of the front plate, the front plate and the peripheral frame have substantially the same thickness, and are below the peripheral frame. Reinforcement ribs are formed between the tongue and front plate, and a groove where the thickness of the lower tongue is 60% is formed on the opposite side of the reinforcement rib at the intersection of the front plate and lower tongue. Anti-sink structure for resin products.

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