KR950010289B1 - Pallet made of synthetic resin - Google Patents

Abstract

No content.

Description

Integral molding method of synthetic resin pellets

1 is a plan view of a pallet showing an embodiment of the present invention.

2 is a front view of the copper pallet.

3 is a cross-sectional view along the line I-I of FIG.

4 is a cross-sectional view taken along the line II-II of FIG.

5 is a plan view of a cylindrical frame for attaching a resilient material.

6 is a cross-sectional view taken along line III-III of FIG.

7 is an explanatory diagram showing a relationship between a long slide die and a short slide die.

8 to 10 are explanatory diagrams showing the relationship and operation of the long slide die and the slide core.

* Explanation of symbols for main parts of the drawings

1: surface deck 2: bottom deck

3: edge cylindrical girder 3: middle cylindrical girder

6, 7: fork insertion hole 8: vertical rib

9: horizontal rib 10: flame retardant

11: groove 20: cylindrical frame

21: protruding rib 30: upper mold

40: lower die 50: long slide mold

60: short slide mold 70a: upper slide core

70b: Haslide Core

The present invention has a four-way inserting fork inlet which can be transported and unloaded by a forklift as a unitary molded pellet made of synthetic resin, and at the same time, it can slide on a fork or a load while working on a pallet that can be used on both sides. The present invention relates to a method for integrally molding a pellet having a structure in which a repellent material is provided so as not to occur.

In the related art, a synthetic resin pad is easily slid with respect to a metal fork and has been studied in various ways. For example, as known from Japanese Patent Application Laid-Open No. 63-44625, a type in which hard rubber with a large coefficient of friction is forcibly poured into a hole is known. The rods can be molded separately into the upper half and the lower half, which can be applied to the integrated pads by means such as heat welding or bolting after molding.

This known anti-friction material attaching structure was not applied to a pad of a form in which the whole is integrally formed, a four-sided insert, and a double-sided usable form. That is, it is necessary to configure the frame forming the deck on the upper deck and the lower deck at the intersection of the fork insertion opening in the two-sided use and the four-sided insert pad, so that the upper and lower positions overlap each other. Forming a structure for locking and fixing the repellent material on the edge will not be constructed unless special research is done.

The present invention is to provide a method for integral molding of plastic inserts of four-sided and double-sided synthetic resin formed on the inner surface of the cylindrical frame protruding ribs for stopping the retaining material.

The paddle of the present invention for the above purpose is the surface deck and the bottom deck is connected by the middle cylindrical girder and the central cylindrical girder installed in the middle of the corner cylindrical girder and the corner cylindrical girder, between the cylindrical girder In the synthetic resin paddle which is integrally molded to allow fork insertion, the frame of the surface deck and the frame of the lower deck do not overlap between the middle cylindrical girder and the central cylindrical girder and within each cylindrical girder. At the same time, the surface deck and the lower deck are formed by a grid-like frame and a cylindrical frame between the vertical rib and the horizontal rib between the corner cylindrical girder and the intermediate cylindrical girder and at the intersection of the fork insertion hole. The protruding rib for locking the anti-friction material is provided on the inner surface of the cylindrical frame.

In addition, the method of molding the pallet includes an upper mold 30 and a lower surface deck forming a portion corresponding to the surface deck 1 so that the surface deck 1 portion and the lower surface deck 2 portion are integrally formed. Aligning the lower die 40 forming a portion corresponding to 2); Inserting four long slide molds 50 between the upper mold 30 and the lower mold 40 to form two pairs of fork insertion holes parallel to each other; The four short slide molds 60 are contacted perpendicularly to the sides of the long slide molds 50 so as to form two pairs of fork insertion holes 6 orthogonal to the two pairs of fork insertion holes 7. Inserting; Each of the long slide molds includes slide pins 51 having upper and lower slide cores 70a and 70b that are movable up and down near the distal end portion to form the protruding ribs 21 for stopping the retaining member. Longitudinally disposing inside 59; Injecting molten resin into the molds to form a four-sided synthetic resin pellet having the protruding ribs 21 for stopping the resilient material; Moving the respective slide pins 51 to the outside to separate the upper and lower ride cores 70a and 70b from the protruding ribs 21 for stopping the activator; The mold members 30, 40, 50 and 60 are separated from the molding.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The paddle shown in FIGS. 1 to 6 has a surface deck (1) formed by a plurality of frames having different directions or different cross-sectional shapes, and a lower deck (2) having almost the same shape as the surface deck (1). Four cylindrical cylindrical girders (3) connecting the surface deck (1) and the lower surface deck (2), and four intermediate cylindrical girders (3) installed in the middle of the cylindrical cylindrical girders (3) 4) and one central cylindrical girder 5 provided in the center portion of the pared outline.

Fork insertion holes 6 and 7 are formed in a # shape between the cylindrical girder 3, 4 and 5, the surface deck 1 and the lower deck 2. Then, the surface deck (hereinafter referred to as the surface deck of the intersection) 1 'and the bottom deck (hereinafter referred to as the bottom deck of the intersection) 2' of the portion where the fork insertion holes 6 and 7 intersect, have vertical ribs ( 8) and a horizontal frame 9 orthogonal to each other, a grid-like frame is formed and at the center of the surface deck 1 'of the intersection and the lower surface deck 2' of the intersection, the longitudinal ribs 8 and the horizontal ribs 9 are formed. Cylindrical frame 20 is connected to be installed.

The cylindrical frame 20 has a ring-shaped protruding rib 21 which protrudes to the inner lower side of the cylindrical frame 20 as shown in FIGS. 5 and 6. When the protruding ribs 21 are placed with the hard rubber active material 10, they are fitted into the grooves 11 of the anti elastic material 20. In this way, the anti-friction material 10 is reliably hooked and fixed to a pallet.

Since the recesses 11 of the anti-friction material 10 are provided in a circumferential shape, the anti-fire material 10 is fixed to the protruding ribs 21 at any rotational position without requiring alignment.

Next, the molding method of the synthetic resin pellets of the present invention will be described. To mold the synthetic resin pellets, a molding die as shown in FIGS. 7 to 10 is used. This molding die is roughly constituted by an upper die 30, a lower die 40, and a long slide die 50 and a short slide die 60.

When molding the synthetic resin pellet, the upper mold 30 forming the surface deck 1 portion and the lower mold 40 forming the lower deck 2 portion are aligned with the surface deck 1 portion. The deck (2) portion is integrally formed, and the four long slide molds (50) and the upper mold (30) to form two parallel fork inlets (7) of the four fork inlets (6) (7) It is inserted between the lower mold 40. In this long slide mold (50), slide pins (51) having upper and lower slide cores (70a) and (70b) are mounted near the distal end portion to form a protruding rib (21) for non-slid stop. Four short slide molds 60 abut the outer surface of the long slide 50 to form another two fork inserts 6 orthogonal to the two fork inserts 7.

In the mold as described above, the upper mold 30 forms the surface deck portion, the lower mold 40 forms the lower deck portion, and by fitting both molds 340 and 40, the cylindrical cylindrical girder (edge portion) ( 3), the intermediate cylindrical girder 4, the central cylindrical girder 5, and the outer circumferential wall are integrally formed so as to be connected to the surface deck 12 and the lower deck 2. Regarding each fork insertion hole 6 and 7, as shown in FIG. 7, the four long slide molds 50 and the short slide mold 60 and the upper and lower molds 30 abutting as orthogonal to each long slide mold are shown. And 40 are formed by fitting. In addition, although the cylindrical frame 20 formed in the surface deck 1 and the lower deck 2 shown in FIG. 3 is formed by the upper mold | type 30 and the lower mold | type 40, the frame 20 The upper slide core 70a placed near the distal end portion of the slide pin 51 embedded in the long slide mold 50 as shown in Figs. And a lower slide core 70b and upper and lower molds 30 and 40. Further, for the intermediate portion of each fork insertion hole 6, 7 not formed by the long slide mold 50 and the short slide mold 60 shown in FIG. 7, the cavity 1a 'of FIG. As shown in part (2a '), the upper mold 30 and the lower mold 40 are formed to mesh with each other, and in this state, the long slide mold 50 is in contact with the upper mold 30 or the lower mold 40. do.

In the portion between the intermediate cylindrical girder 4 and the central cylindrical girder 5 of the synthetic resin pellets and in the respective cylindrical girder 3, 4 and 5, as shown in Figs. The surface deck 1 and the lower surface deck 2 are formed by the frames 1a and 2a arranged so as not to overlap. These frames 1a and 2a are formed by the cavities 1a 'and 2a' formed by alternately projecting the upper mold 30 and the lower mold 40 as shown in FIG.

As shown in FIG. 1, the portion between the cylindrical cylindrical girder 3 and the intermediate cylindrical girder 4 and the fork insertion openings 6 and 7 of the synthetic resin pellets, as shown in FIG. The surface deck 1 and the lower surface deck 2 are formed by the lattice-shaped frame which the rib 8 and the horizontal rib 9 orthogonally cross.

These parts are molded by the cavity formed by the upper mold 30 and the lower mold 40, and the long slide mold 50 and the short slide mold 60 provided as shown in FIG. These slide molds 50 and 60 are for forming the fork insertion openings 6 and 7. The long slide mold 50 and the short slide mold 60 are each provided four. The short slide mold 60 is provided at a position orthogonal to the long slide mold 50. The tip of the short slide die 60 is in contact with the side surface of the long slide die 50 when the molding die is sealed.

As shown in FIG. 8, the upper slide core 70a and the lower slide core 70b are provided in the vicinity of the front end of the long slide mold 50. As shown in FIG. Then, by stopping the fastening material 10 by the cavity formed by the upper slide core (70a) and the upper die 30 and the cavity formed by the lower slide core (70b) and the lower die (40). Protruding ribs 21 are formed.

In other words, the upper and lower slide cores 70a and 70b cut the inner portion of the anti-logging fastening rib 21 as shown in Fig. 6 (formation of the undercut portion).

The cylindrical frame 20 having the protruding ribs 21 for stopping is formed on both sides of the surface deck 1 and the lower deck 2, respectively, on the deck portion where the fork insertion holes 6 and 7 intersect. It is preferably formed.

Since the anti-friction material 10 is installed in this cylindrical frame 20, a pallet can be used in the upper and lower surfaces.

Next, with reference to FIGS. 8-10, the operation | movement of a molding die is demonstrated.

In order to mold the synthetic resin pad of the present invention, first, the upper mold 30 and the lower mold 40 are sealed and the long slide mold 50 and the short slide mold 60 are advanced to the position shown in FIG. Let's do it. In this state, as shown in FIG. 8, when the slide pin 51 of the long slide die 50 is advanced, the upper slide core 70a and the lower slide core 70b are pushed up and down, and the upper mold 30 and the lower die are lowered. In contact with the mold 40. The hooked upper slide core 70a and the lower slide core 70b are in contact with the tapered upper portion of the slide pin 51 which is tapered in the direction of the distal end portion. That is, the upper and lower slide cores 70a and 70b are engaged with the grooves along the slide pins 51, so that when the slide pins 51 are advanced, the upper and lower slide cores 70a and 70b are vertically upper and lower molds 30, respectively. ) And (40) to stop.

In addition, when the slide pin 51 is retracted, the upper and lower slide cores 70a and 70b are separated from the upper and lower molds 30 and 40 with the movement of the slide pin 51 by a certain groove, respectively. In this state, when resin is injected into the molding die, synthetic resin pellets are molded.

In order to lift the molded synthetic resin pellet out of the molding die, the slide pin 51 of the long slide mold 50 is first retracted as shown in FIG. As a result, the upper slide core 70a and the lower slide core 70b do not enter the same position as the long slide mold 50 or more and do not hit the molding, so that the mold is separated from the molding smoothly. do. Thereafter, as shown in FIG. 10, the long slide die 50 and the short slide die 60 are retracted, and the upper die 30 and the lower die 40 are opened. In this state, the synthetic resin pellet is lifted out of the molding die.

The synthetic resin pad of the present invention is formed by a lattice-shaped frame and a cylindrical frame composed of vertical ribs and horizontal ribs at the intersections of the fork insertion ports of the surface deck and the lower deck, and hangers are placed on the inner surface of the cylindrical frame. Since it is installed with a stopping lap, it is possible to use both sides by inserting four-sided and at the same time, it is a united molding pad, and it is possible to fix the stop by firmly pouring the repellent material after the molding of the paddle.

In the synthetic resin paddle of the present invention, a cylindrical frame having protruding ribs for stopping the stopping material is provided in a portion having a small deformation by load, which is formed by the lattice-shaped frame of the surface deck and the lower deck. Since the fire retardant and the fork or the fire retardant and the load are firmly in contact with each other, sufficient friction is generated. Therefore, the synthetic resin pad of the present invention has a large anti-corrosive effect.

In the molding method of the present invention, the fork insertion hole is formed by the long slide mold and the short slide mold, and at the same time, the upper and lower slide cores are installed on the long slide mold to form the undercut due to the protruding ribs for stopping the resilient material. It is possible to manufacture a synthetic resin pellet which is a double-sided use type, and is a unitary molded pellet, and at the same time, can be fixed by placing a resilient material tightly after the molding of the paddle.

Claims (1)

The surface deck 1 and the lower deck connected by four corner cylindrical girders 3, an intermediate cylindrical girder 4 formed in the middle of the corner cylindrical girder 3, and a central cylindrical girder 5 2), fork insertion holes 6, 7 formed in a shape of a bead between the cylindrical girders 3, 4, 5, the corner cylindrical girders 3 and the intermediate cylindrical girders 4, respectively. G) a frame formed by a longitudinal lead 8 and a horizontal rib 9 between the frame and a cylindrical frame formed at approximately the center of the grid frame, and having a protruding rib 21 for stopping the locking material therein. In the method for forming a double-sided use and a four-way insert plastic pad made of a frame 20, a portion corresponding to the surface deck 1 so that the surface deck 1 portion and the lower surface deck 2 portion are integrally formed. Fitting the upper mold 30 to form a lower mold 40 to form a portion corresponding to the lower deck 2; Inserting four long slide molds 50 between the upper mold 30 and the lower mold 40 to form two pairs of fork insertion holes parallel to each other; The four short slide molds 60 are contacted perpendicularly to the sides of the long slide molds 50 so as to form two pairs of fork insertion holes 6 orthogonal to the two pairs of fork insertion holes 7. Inserting; Each of the long slide molds includes slide pins 51 having upper and lower slide cores 70a and 70b that are movable up and down near the distal end thereof to form the resilient material stopping stone ribs 21. 50) longitudinally placing inside; Injecting molten resin into the molds to form a four-sided synthetic resin pellet having the protruding ribs 21 for stopping the resilient material; Moving the respective slide pins 51 to the outside to deviate the upper and lower slide cores 70a and 70b from the protruding ribs 21 for stopping the activator; The mold member 30, 40, 50, 60, characterized in that the step of separating from the molding fire, characterized in that the four-part insert molding method of synthetic resin pads.

Images