JP2592810Y2 - Casters for chairs and chairs with casters - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a caster for a chair or the like which is used for lightly moving a chair or the like when the load is lifted and a load is lifted and the load is removed, and a caster for the chair. In particular, it relates to an attached chair for learning and the like.

[0002]

2. Description of the Related Art In recent years, especially in a learning chair for lower grade children, when seated, the wheel is retracted by the weight of the user to stabilize the chair in a fixed state on the floor, and the body is lifted or separated from the chair. When weight is not applied, attention has been paid to the addition of a castable caster that allows the wheels to advance to support the weight and move lightly on the floor.
Conventionally, as a caster for such an application, a fitting hole is formed by forming a fitting hole in the lower surface of the left and right tangential ties connecting the lower ends of the front and rear support legs of the chair, and fitting the caster housing into this. (For example, Jpn.
And an external type (for example, Japanese Utility Model Application Laid-Open No. 53-164469) in which a casing of a caster is attached to the outer surface of the tangential crossing with screws or the like.

[0003] Both of the above-mentioned casters have a basic structure having a housing made of a synthetic resin and having an open lower surface, in which a wheel is supported so as to be able to move up and down, and a spring is used. It is held elastically at a predetermined lowering position at all times.

[0004]

However, in the fitting type, there is an advantage that the mounted state of the casters is hardly seen and the appearance of the chair is not spoiled.
On the contrary, there is a dilemma that it is hard to appeal to the purchaser that the chair has the excellent functionality with the caster, and that it has an undesirable result in sales. Not only that, such a cast-in type caster has to be mounted with a large-sized fitting hole in the tang-type crossing, so that the mounting operation is somewhat troublesome, and the productivity of the chair is reduced. was there.

In the case of the external type caster, the caster protrudes outward on the side surface of the leg of the chair. There were inherent disadvantages such as being easily damaged by striking the table legs.

Further, in either of the above two types, the size of a wheel which must be lifted and lowered in a housing is limited to a diameter of about 20 to 25 mm at most, due to a limitation of a size to be received in use. It was restricted to relatively small ones. For this reason, there is a problem that the chair cannot be moved lightly when moving the chair, especially on a carpet floor or a tatami floor. Furthermore, in assembling and manufacturing the caster itself, the number of parts is large, and after the wheels are pivotally mounted on a swing arm or a bearing member with an axle in advance, the bearing member can be further swung or lifted and lowered in the housing. Due to the necessity of assembling, there was a regret that the production was troublesome and the cost was high.

In order to solve the above-mentioned problems, the present invention is to provide a flat caster which does not hinder the caster from being disturbed by a simplified structure, larger wheels, or an external mounting on a chair. The purpose of the present invention is to make the operation of raising and lowering the wheels smoother.

[0008]

The caster according to the present invention has a total number of parts consisting of only four points of the mounting plate, the lifting / lowering operating piece, the wheel, and the spring for the above purpose.

The mounting plate is made of a metal plate, and has a central portion in the width direction, an upper portion having an enlarged hole portion, and a lower portion having a relatively narrow guide hole portion. A hole is formed. The elevating operation piece is preferably made of a hard synthetic resin, has a size corresponding to the enlarged hole of the vertical hole, and has one vertical slide groove formed on both side surfaces. The upper hole is fitted into the vertical hole and the slide grooves on both side surfaces are slidably fitted on both side edges of the guide hole portion, whereby the vertical hole is movably combined with the mounting plate.

In these combined states, a compression spring, generally composed of a coil spring, is interposed between the upper end edge of the vertical hole and the upper surface of the lifting / lowering operating piece, and always moves the lifting / lowering operating piece to the lowered position. The elastic member is held elastically, and the operating piece is prevented from coming off from the enlarged hole.

The wheel is preferably made of a synthetic resin molded body having a flat U-shaped cross-section having a bearing cylinder portion integrally projecting from the center of the inner surface, and an axle integrally projecting from the outer surface of the lifting operation piece. By forcibly fitting the bearing cylinder,
It is rotatable and mounted in a pull-out preventing state.

The above-mentioned casters are mainly used for wooden learning chairs. In such a case, the casters are mounted on the inner side surfaces of the left and right floor mats connecting the front and rear chair legs at their lower ends, respectively, one pair at the front and rear.

[0013]

1 to 3 show the structure of a caster according to the present invention. In these figures, (1) is a mounting plate, which is made of a metal plate having a substantially rectangular shape in a horizontal direction. A pair of mounting holes (2) are formed at the left and right ends of the mounting plate (1), and a pair of mounting holes (2) is formed at the center in the width direction. Having. And this bent part (3)
A vertical hole (4) is formed by drilling in the center of the. The vertical hole (4) has an enlarged hole (4a) having a substantially square upper part,
The lower part following this is a relatively narrow guide hole (4b). At the center of the upper edge of the enlarged hole (4a), a small spring receiving piece (5) projecting downward is projected.

(6) is a lifting / lowering operation piece, which is made of a hard synthetic resin molded body such as polyamide resin. The lifting and lowering piece (6) is a rectangular piece sized to fit into the enlarged hole (4a), has vertical slide grooves (7) and (7) on both side surfaces, and has a central upper part of the outer surface. And an axle (8) protruding therefrom, and a spring receiving recess (9) on the upper surface.
Having. The axle (8) has an annular groove (8a) for engagement at an intermediate portion in the longitudinal direction.

The lifting operation piece (6) is fitted into the vertical hole (4) of the mounting plate (1) through the upper enlarged hole (4a), and the slide grooves (7) ( 7) is slidably fitted to both side edges of the guide hole (4b), so that the mounting plate (1) can be vertically moved.

A coil-shaped compression spring (10) is provided between the spring receiving projection (5) at the upper edge of the vertical hole (4) and the spring receiving recess (9) of the lifting / lowering operating piece (6). It is interposed in a slightly compressed state. As a result, the lifting / lowering operation piece (6) is always held at the lowered position in contact with the lower edge of the vertical hole (4), and the subsequent lifting / lowering operation piece (6) is unintentionally removed from the enlarged hole (4a). Is to be prevented.

Reference numeral (11) denotes a hard synthetic resin wheel having a diameter of about 50 to 60 mm, which is formed in a flat U-shape in cross section having an annular floor contact flange (13) on the outer peripheral edge, and has a central inner surface. , A bearing cylinder (12) is integrally provided. The inner surface of the bearing cylinder (12) has an annular ridge (12
a ) is provided.

The wheel (11) has its bearing cylinder (1)
2) is forcibly fitted to the axle (8) of the lifting / lowering operating piece (6), and the above-mentioned annular ridge (12) is fitted into the annular groove (8a) of the lifting / lowering operating piece (6). And it is attached in a pull-out prevention shape. In this mounting state, as shown in FIG. 2, the lower end of the wheel (11) is normally positioned so as to protrude about 10 to 15 mm below the lower end of the mounting plate (1).

FIG. 4 shows a preferred example when the above-mentioned caster (A) is applied to a wooden learning chair (15). In the figure, the casters (A) are attached to the inner side surfaces of the left and right floor mats (18) connecting the lower ends of the front and rear chair supports (16) and (17), respectively. I have. This mounting is performed by fixing the mounting plate (1) to the side surface of the horizontal support (18) with mounting screws (14) as shown in FIGS. 2 and 3, and in this mounted state, the wheels (11) Project from the lower surface of the horizontal member (18) by about 5 to 10 mm.

In the above, when no person is sitting on the chair (15), the wheel (11) comes into contact with the floor surface, and the chair can be moved lightly in the front-rear direction by the rolling.
On the other hand, when a person sits on the chair (15), the weight of the person acts to overcome the resilience of the compression spring (10). As a result, the lifting / lowering operating piece (6) is compressed by the vertical hole (4). ) Rise along. As a result, the floor mat (18) descends in relation to the wheel (11), and its lower surface contacts the floor (G), thereby preventing the chair from moving unnecessarily. Therefore, the chair can be held stably during learning.

The caster according to the present invention (A)
Can be applied not only to chairs as described above but also to other furniture.

[0022]

[Effect of the Invention] This invention has the following effects.

(1) The caster can be easily assembled and manufactured at a low cost.

That is, the number of components is extremely small as four, and all of them are easy to mold, and the assembly can be completed only by the work of fitting the components together. In addition, both assembly costs can be greatly reduced as compared with conventional products.

(2) The entire caster can be made extremely flat and suitable for use in a simple external system such as a chair leg.

That is, since the entire thickness of the caster can be kept within the range of the thickness of the wheel or the thickness of the mounting plate in combination with the width of the wheel, the whole can be made extremely flat. Therefore, even if the chair is externally attached to the chair legs, it does not greatly protrude outward, and the degree of obstruction is small, so that it can be easily attached to a chair or other furniture and used without any trouble.

(3) The wheels can be made large in diameter, and the chairs and the like can be moved more easily.

That is, since the wheels are mounted on one side of the mounting plate, the size of the wheels is not limited by the housing unlike the conventional product. Therefore, a relatively large wheel can be used, and when the chair is equipped, the chair can be moved more easily even on a carpeted floor or the like.

(4) In the chair equipped with the caster according to the present invention, the caster is attached to the inner side surface of the tangential crossing, so that the caster can be hooked on the caster, There is no danger of hitting against a desk leg or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing components of a caster according to the present invention in a separated state.

FIG. 2 is a vertical sectional view of the caster in an assembled state.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a perspective view of the chair with casters according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mounting plate 4 ... Vertical hole 4a ... Enlarged hole part 4b ... Guide hole part 6 ... Elevating operation piece 7 ... Slide groove 8 ... Axle 10 ... Compression spring 11 ... Wheel 12 ... Bearing cylinder part 15 ... Chairs 16, 17 ... Chair Attached legs 18: Abutment bed A: Casters

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60B 33/00-33/06 A47B 91/00

Claims (3)

(57) [Scope of request for utility model registration] A vertical hole having an upper portion as an enlarged hole portion and a lower portion as a relatively narrow guide hole portion is formed in the mounting plate, and the elevating operation piece having a size adapted to the enlarged hole portion is provided. The vertical hole is fitted into the vertical hole through an enlarged hole portion, and is slidably fitted on both side edges of the guide hole portion on both sides of the guide hole portion so as to be vertically movable with the mounting plate. A compression spring is interposed between the upper end edge of the lifting and lowering piece and the lifting and lowering piece, and a wheel is forcibly fitted to an axle integrally projecting from an outer surface of the lifting and lowering piece so that the wheel is rotatably mounted in a pull-out preventing state. A caster for a chair or the like, characterized in that 2. The caster for a chair or the like according to claim 1, wherein the wheel is made of a synthetic resin molded article having a flat U-shaped cross section and a bearing cylinder portion integrally projecting from the center of the inner surface. Wherein inward side of the contact floor horizontal rungs of the right and left were connected by the lower end of the front and rear of the chair support leg, a pair at a time before and after each claim 1 or 2, wherein the casters comprising attached caster chair.