JP2983524B1 - Molded products with casters - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To make a plastic caster a structure that is easy to recycle, and to make it possible to recycle molded articles with casters. A caster body (7) and a caster body (7)
And the wheel 8 coupled to the axle 10 formed in the above-mentioned manner, respectively, is molded with the same or similar synthetic resin material as the molding material of the molded product 1 to which the plastic caster A is assembled.
Hollow shaft-shaped connecting shaft 1 formed integrally with caster body 7
The caster body 7 and the molded product 1 are connected with the molded product 1 fitted in the bearing hole 3 of the molded product 1 to prevent the product from being removed. To

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a chair, a wagon,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article with a caster in which a plastic caster is attached to a molded article constituting a part of office furniture such as a document holder and a cart, and particularly to a molded article with a caster having a structure that is easy to recycle.

[0002]

2. Description of the Related Art When a plastic caster having a caster body and wheels made of a synthetic resin is assembled to a molded product such as a leg of an office chair, conventionally, for example, a screw of a metal caster pin connected to the caster body is used. The part is screwed into a nut inserted at the time of molding into the inside of the molded article to which the caster body is assembled, so that the caster body and the molded article are joined. As a conventional technique, there is, for example, Utility Model Registration Publication No. 252604.

[0003]

When a used plastic caster having a caster body and wheels made of synthetic resin is crushed for recycling, a metal caster pin or axle is connected to the caster body. In addition, the trouble of removing the caster pins and axles from the caster body becomes complicated, and metal parts such as nuts are inserted inside molded articles of synthetic resin such as legs of office chairs to which plastic casters are attached. If the caster-equipped molding is cast, it is not possible to crush the caster-equipped molded product while the caster is still attached. Need to be separated. An object of the present invention is to make a plastic caster a structure that is easy to recycle, and to enable a recycling process in which a molded article with casters is crushed and reused as it is.

[0004]

According to a first aspect of the present invention, there is provided a molded article with casters, wherein a caster body of a plastic caster is integrally formed with an axle having wheels rotatably connected thereto, and A wheel and a molded product to which a plastic caster is attached are molded with the same or similar synthetic resin material, and a connecting shaft integrally formed on the caster body is fitted into a bearing hole recessed in the molded product. The caster body is rotatably connected to the molded product in a state where the caster body is prevented from falling off.

According to the first aspect of the present invention, the caster main body of the plastic caster, the wheel connected to the axle of the caster main body, and the molded product to which the plastic caster is assembled are all formed of the same or similar synthetic resin material. Along with the connecting shaft formed integrally with the caster body and fitted into the bearing hole of the molded product,
The caster body and the molded product are connected without using metal parts, and it is possible to recycle the molded product with the caster to which the plastic caster is connected while crushing the caster with the caster connected. At this time, only the same kind of synthetic resin crushed waste is crushed and collected without mixing of different kinds of synthetic resin crushed waste.

Further, said connection shaft and running through the vent hole to form the connecting shaft to the hollow shaft shape, the outer peripheral surface of the connecting shaft, the inner crowded fitting the coupling shaft into the bearing hole When pushed into the part, the ridge formed on the peripheral surface of the bearing hole engages and engages the connecting shaft in the circumferential direction along the engaging groove for allowing the connecting shaft to rotate and prevent the connecting shaft from coming off. Forming
At the outer end of the hole, when the connecting shaft is fitted into the bearing hole and pushed into the inner part thereof, the connecting shaft comes into contact with a receiving surface of a convex portion formed at the top of the bearing hole, so that the receiving shaft comes into contact with the receiving shaft. It has a configuration in which a contact edge received by the surface is formed.

[0007] Thus, by forming the connecting shaft into a hollow shaft through the through hole in the connecting shaft connecting the caster body and the molded product, the connecting shaft can be bent without increasing the cross-sectional area of the connecting shaft. The rigidity can be increased, and the strength characteristics of the connecting shaft required for connecting the caster body and the molded product are secured. Further, when the connecting shaft of the caster body is fitted into the bearing hole of the molded product and pushed inward, the engaging groove formed on the outer peripheral surface of the connecting shaft and the convex ridge formed on the peripheral surface of the bearing hole are engaged. At the same time, the contact edge formed at the outer end of the hole of the connecting shaft abuts against the receiving surface of the convex portion formed at the top of the bearing hole, and the tip of the connecting shaft is received by the receiving surface,
The connection shaft fitted in the bearing hole is free of looseness and poor fitting, and the connection shaft is properly connected to the molded product.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. A plastic caster A entirely made of a synthetic resin material so as to be easily recycled is attached to a molded article 1 formed of a synthetic resin material. In this embodiment, the plastic caster A is
A plurality of arms 2 are formed of a synthetic resin material into a radially-arranged shape, and assembled to the tip of each arm 2 of a molded article (leg) 1 constituting the lower part of the office chair. I have.

The molded article 1 is produced by molding a synthetic resin material such as a polyamide resin, a polyolefin resin, a polyacetal resin, and a polyester resin.

For example, when molding the molded article 1 using a polyamide resin as a molding material, a polyamide resin such as a nylon 6 resin, a nylon 66 resin, a mixed resin of a mixture of nylon 6 and nylon 66, or the like; Reinforced polyamide resin in which glass fiber or inorganic filler is kneaded into polyamide resin, or polyamide-based synthetic resin material such as polyamide-based polymer malloy in which polyamide resin is mixed with polyolefin resin or ABS resin during polymerization. Polyamide-based synthetic resin materials which can be regenerated as products without any use are used alone or in appropriate combination.

When molding the molded article 1 with a polyolefin resin, a polyacetal resin, a polyester resin, or the like, the same synthetic resin material is used alone or in an appropriate combination as in the case of the polyamide resin.

At the end of each arm portion 2 of the molded product 1, a bearing hole 3 which is formed in a downwardly open manner and is provided for mounting a plastic caster A is formed.

On the top surface 3a of each bearing hole 3, a frusto-conical convex portion 4 having a conical receiving surface 5 whose outer diameter gradually decreases from above to below is formed on the outer peripheral surface thereof. On the peripheral surface 3b of each bearing hole 3, a ridge 6 is formed to protrude annularly along the circumferential direction.

The plastic caster A is provided with a caster body 7 and a pair of wheels 8, 8 each formed of the same or similar synthetic resin material as the molding material of the molded article 1, for example, the above-mentioned polyamide synthetic resin material. I have.

At the center in the width direction of the caster body 7, an upright wall portion 9 is formed with its outer edge curved in an arc shape.
In the center of the lower end of the wall 9, there are 1
A pair of axles 10 are integrally connected, and wheels 8 are rotatably connected to the two axles 10, respectively.

The outer peripheral surfaces of the two axles 10 are each provided with a groove 1.
An inner peripheral surface of a pair of cylindrical bearing portions 8a formed at the center of both wheels 8 and fitted with an axle 10 is provided with a projection engaging with a groove 11 of the wheel 10. The parts 12 are each protruded annularly.

In the wheel 8, the convex portion 12 has a groove 11 of the wheel 10.
Axle 1 in a state where the bearing portion 8a is locked
0 so that it can be rolled on the ground.

An outer edge of the wall 9 is connected to a fender 13 having a shape curved in an arc along the outer edge and installed so as to cover both wheels 8.

The caster body 7 has a fender 13 as a whole.
Projecting upward, the shaft center is connected to the vicinity of one end of the fender 13 in a state of being orthogonal to the shaft center of the axle 10, and is fitted into the bearing hole 3 of the molded product 1 to connect the caster body 7 to the molded product 1. A connection shaft 14 having a hollow shaft shape is integrally formed.

At the center of the connecting shaft 14, the connecting shaft 14
Are formed to form a hollow shaft through which the hole extends.

On the outer peripheral surface of the connecting shaft 14, the connecting shaft 14
Is inserted into the bearing hole 3 of the molded product 1 and the bearing hole 3
An engagement groove 16 is formed in an annular shape to prevent the connection shaft 14 from slipping off when the protrusion 6 of the bearing hole 3 is engaged to allow the rotation of the connection shaft 14 when the connection shaft 14 is pushed into the inner part of the shaft.

At the end of the connecting shaft 14, at the outer edge of the hole 15, the connecting shaft 14 is fitted into the bearing hole 3, and when the connecting shaft 14 is pushed inward, the inside of the outer end of the hole 15 Abutment edge 17 is formed which abuts against and is received by receiving surface 5 of convex portion 4 which has protruded into bearing hole 5 and defines a fitting end of connecting shaft 14 in bearing hole 3.

When the connecting shaft 14 is fitted into the bearing hole 3 of the molded product 1 and pushed into the inner part thereof, the engaging groove 1 of the connecting shaft 14 is
6 engages with the ridge 6 of the bearing hole 3 to prevent the connecting shaft 14 from coming off in the bearing hole 3, and at the same time, the vicinity of the tip of the convex portion 4 of the bearing hole 3 When the caster body 5 protrudes into the outer end, the contact edge 17 of the connecting shaft 14 abuts against the receiving surface 5 of the projection 4 and the tip of the connecting shaft 14 is received by the receiving surface 5, the caster main body 5 Is mounted so as to be rotatable about the axis of the connecting shaft 14 via the connecting shaft 14.

According to the above-described embodiment, the plastic caster A having the caster body 7 and the wheels 8 formed of the same kind of synthetic resin material as the molding material of the molded article 1 to which the plastic caster A is to be assembled is used. Since the metal connecting part can be removed from the caster body 7 and the molded article 1 by being connected to the molded article 1 by the connecting shaft 14 formed integrally with the caster 7, the caster main body 7 and the molded article 1 can be made of metal at the time of recycling. It is not necessary to remove the connecting parts and to separate the caster main body 7 from the molded product 1, and to recycle the molded product with the caster on which the plastic caster A is assembled by crushing and reusing it as it is. Processing can be performed, and the recycling process of used plastic casters A and molded products 1 can be simplified. It is possible to fine-efficiency.

Further, since the connecting shaft 14 is formed in a hollow shaft shape by forming a hole 15 in the connecting shaft 14,
By setting the outer diameter and the cross-sectional shape of 4 in accordance with the required characteristics of the connecting shaft 14, the connecting shaft 14 can be provided with the strength characteristics necessary for connecting the caster body 7 and the molded product 1.

Further, with the contact edge 17 of the connecting shaft 14 abutting against the receiving surface 5 of the molded article 1, the engaging groove 1 of the connecting shaft 14
6 and the ridge 6 of the molded product 1 are engaged, so that the bearing hole 3
The connection state between the caster main body 7 and the molded article 1 by the connection shaft 14 can be strengthened and stabilized by eliminating the looseness, poor fitting and poor retaining of the connection shaft 14 fitted therein.

Also, a used plastic caster A
And when crushing molded products with casters, it is possible to collect only the same type of synthetic resin crushed debris without mixing different types of synthetic resin crushed debris, and to effectively reuse all collected crushed debris Becomes possible.

[0028]

According to the first aspect of the present invention, a plastic caster having a caster main body and wheels formed of the same or similar synthetic resin material as the molding material of the molded product to which the plastic caster is assembled is attached to the caster main body. Since the metal connecting part can be removed from the caster body and the molded article by connecting to the molded article by the integrally formed connecting shaft, the work of removing the metal connecting part from the caster body and the molded article at the time of recycling, Also, there is no need to separate the caster body from the molded product, and the molded product with the caster to which the plastic caster is assembled can be crushed and reused as it is, and the recycled plastic caster and molded product can be reused. It is possible to simplify and improve the efficiency of the molded product recycling process

Further, when used plastic casters and molded articles with casters are crushed, only the same type of synthetic resin crushed debris can be collected without mixing of different types of synthetic resin crushed debris. Crushed waste can be effectively reused.

Further , since the connection shaft is formed in a hollow shaft shape by forming a hole in the connection shaft, the outer diameter and the cross-sectional shape of the connection shaft are set according to the required characteristics for the connection shaft, and the caster body is formed. The connection shaft can be provided with strength characteristics necessary for connecting the molded product and the molded product.

Further, since the engaging groove of the connecting shaft and the ridge of the formed product are engaged with the contact edge of the connecting shaft abutting against the receiving surface of the formed product, the connection fitted into the bearing hole. It is possible to enhance and stabilize the connection state between the caster main body and the molded product by the connection shaft by eliminating rattling, fitting failure and retaining failure of the shaft.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molded product with casters, showing one embodiment of the present invention.

FIG. 2 is a partially cutaway side view of a main part.

FIG. 3 is a side sectional view near a bearing hole.

FIG. 4 is a longitudinal sectional view of a plastic caster.

FIG. 5 is a side view of the caster main body.

FIG. 6 is a plan view of a caster main body.

FIG. 7 is a sectional view taken along line X1-X1 of FIG. 5;

8 is a sectional view taken along line X2-X2 in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded product 3 Bearing hole 5 Bearing surface 6 Convex ridge 7 Caster body 8 Wheel 10 Axle 14 Connection shaft 15 Drilling hole 16 Engagement groove 17 Contact edge A Plastic caster

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-257104 (JP, A) JP-A-9-220906 (JP, A) JP-A-10-181303 (JP, A) 63365 (JP, U) Fully open 1979-63366 (JP, U) Fully open 55-68602 (JP, U) Fully open 7-30102 (JP, U) Fully open, 4-131501 (JP, U) Japanese Utility Model Showa 48-20220 (JP, Y2) Japanese Utility Model Showa 33-18137 (JP, Y1) Japanese Utility Model Showa 31-16237 (JP, Y1) Japanese Utility Model Showa 25-7974 (JP, Y1) (58) (Int.Cl. ⁶ , DB name) B60B 33/00-33/08

Claims (1)

(57) [Claims] An axle having wheels integrally rotatably connected to a caster body of a plastic caster, wherein the caster body, the wheels, and a molded product to which a plastic caster is mounted are identical or similar. The caster main body is pivoted to the molded product in a state where the connection shaft formed integrally with the caster main body and formed integrally with the caster main body is fitted into a bearing hole recessed in the molded product and is prevented from coming off. Operatively connected to the connecting shaft
The connection shaft is formed into a hollow shaft shape through the hole
The connecting shaft is inserted into the bearing hole on the outer peripheral surface of the connecting shaft.
When it is fitted and pushed into its back, the bearing hole
The ridge formed on the peripheral surface engages to connect the connecting shaft to the connecting shaft.
Engagement grooves that allow the shaft to rotate and prevent
The connection shaft is formed at the outer end of the hole.
Is inserted into the bearing hole and pushed into the back.
The bearing surface of the projection formed at the top of the bearing hole
Abuts the contact edge received by this receiving surface
Molded product with casters.