JPH10192076A - Protective cap for leg - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make detachment from a leg difficult after being fitted by turning the inclination angle of an inclined wall to the axis of a fitting cylinder part to be tightly fitted to the end part outer peripheral surface of the leg to a specified range. SOLUTION: An inclined cylinder part 3 in a truncated cone shape is constituted of a cylindrical fitting cylinder part 2 tightly fittable to the lower end part outer peripheral surface of the leg 1 composed of a cylindrical pipe and the inclined wall 30 whose diameter is widened from one end. The inclination angle θ2 of the inclined wall 30 to the axis of the fitting cylinder part 2 is turned to be more than about 20 degrees and less than about 35 degrees. By elastically tightly fitting the fitting cylinder part 2 to the end part outer periphery of the leg 1, the end part outer peripheral surface and end edge of the leg 1 are covered with this entire protective cap. Even in the case that force in the direction of being detached from the leg 1 acts on the protective cap fitted to the end part of the leg 1, the inclined wall 30 of the inclined cylinder part 3 is hardly displaced to the direction of turning to the same direction as the axis L of the fitting cylinder part 2 to the fitting cylinder part 2 and a seat part 4. Thus, the phenomenon of pulling a boundary part 2a with the inclined cylinder part 3 in the fitting cylinder part 2 in the direction of separating from the outer peripheral surface of the leg 1 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap mainly fitted to an end of a leg of a chair or table to cover the end of the leg.

[0002]

2. Description of the Related Art Generally, as shown in FIGS. 4 and 5, a protective cap of this type includes a fitting tube portion A closely fitted to an outer peripheral surface of an end portion of a leg P, and one end of the fitting tube portion A. An inclined tubular portion B having an inclined wall B1 that expands in a divergent shape, and a leg G extending from a large-diameter side opening edge of the inclined tubular portion B and having a predetermined gap with respect to the outer peripheral surface of the end of the leg. It comprises a large-diameter cylindrical portion C covering the outer periphery of the end portion, and a seat D closing one end opening of the large-diameter cylindrical portion C, and the entire cap is formed of a soft synthetic rubber material.

In the above protective cap, as shown in FIG. 4, one end of a leg P is inserted into a large-diameter cylindrical portion C from a fitting cylindrical portion A via an inclined cylindrical portion B, and the fitting cylindrical portion is inserted. The inner peripheral surface of A is pressed into contact with the outer peripheral surface of one end of the leg P, so that it is fitted to the leg P.

[0004]

The above-mentioned protective cap is made of a soft rubber material, is easily elastically deformed, and has an axis L extending from the fitting cylindrical portion A to the large-diameter cylindrical portion C.
Is approximately 40 degrees or more, and the inclined wall B1 is largely bent with respect to the fitting cylindrical portion A and the large-diameter cylindrical portion C.

[0005] Therefore, when a force is applied to the protective cap in the detaching direction by, for example, pulling the seat portion D or the large-diameter cylindrical portion C in the direction of arrow X in FIG. 4, the inclined cylindrical portion B also moves in the direction of arrow X. After being pulled, as shown in FIG. 5, the inclined wall B1 of the inclined cylindrical portion B is aligned with the axis L of the fitting cylindrical portion A and the large-diameter cylindrical portion C.
When the inclined wall B1 is displaced as described above, particularly the boundary portion T of the fitting cylindrical portion A with the inclined cylindrical portion B is expanded by the inclined cylindrical portion B,
In other words, there is a problem that the fitting tube portion A is strongly pulled in a direction away from the outer peripheral surface of the leg P, the pressing force of the fitting cylindrical portion A against the leg P is weakened, and the cap itself is easily detached from the leg P.

The present invention has been developed in view of the above circumstances, and it is an object of the present invention to provide a cap which can be easily fitted to a leg such as a table, and which is hard to be detached from the leg after being fitted. To provide.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, an elastically deformable protective cap for covering an end of a leg 1 is provided on an outer peripheral surface of the end of the leg 1. An inclined tube portion 3 having a fitting tube portion 2 that is closely fitted, and an inclined wall 30 that expands in diameter from one end of the fitting tube portion 2.
And a bottomed cylindrical seat (4) for closing the large-diameter side opening of the inclined cylinder (3). The inclination angle of the inclined wall 30 with respect to the axis of the fitting cylinder 2 is approximately 20. That is, it was set to be not less than 35 degrees and not more than 35 degrees.

According to a second aspect of the present invention, in the first aspect of the present invention, the axial dimension of the inclined cylindrical portion (3) is changed to the axial dimension of the fitting cylindrical portion (2) and the seat portion (4). The same or longer. According to the third aspect of the present invention, a non-slip portion (5) is provided on the lower surface of the seat (4).

[0009]

According to the first aspect of the present invention, the outer peripheral surface and the edge of the end of the leg are entirely covered with the protective cap by elastically closely fitting the fitting cylindrical portion 2 to the outer periphery of the end of the leg 1. Even if a force is applied to the protective cap fitted to the end of the leg 1 as described above in a direction in which the protective cap is removed from the leg 1,
It is difficult for the inclined wall 30 of the inclined cylindrical portion 3 to be displaced with respect to the fitting cylindrical portion 2 and the seat portion 4 in the same direction as the axis L of the fitting cylindrical portion 2. Boundary part 2a with 3
Is prevented from being pulled away from the outer peripheral surface of the leg 1.

According to the second aspect of the present invention, the axial dimension of the inclined tubular section 3 is the same as or longer than the axial dimension of the fitting tubular section 2 and the seat section 4. Of the cap can be sufficiently suppressed, and the total length of the cap does not become unnecessarily long. Claim 3
According to the invention described above, since the anti-slip portion 5 is provided on the lower surface of the seat portion 4, it is possible to reliably prevent the leg on which the protective cap is fitted from slipping on the floor surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The protective cap shown in FIGS. 1 to 3 is made of a soft synthetic rubber material and is used by being fitted to the lower end of a leg 1 of a table. It is composed of a cylindrical fitting tube portion 2 that can be closely fitted to the outer peripheral surface of the lower end portion of the leg 1 made of a cylindrical pipe, and an inclined wall 30 that expands in diameter from one end of the fitting tube portion 2. It comprises a truncated cone-shaped inclined cylinder 3 and a bottomed cylindrical seat 4 for closing the large-diameter opening of the inclined cylinder 3, wherein the seat 4 is a large-diameter opening of the inclined cylinder 3. Continuously to the edge, the outer periphery of the lower end of the leg 1 is predetermined (5 mm to 7.5 mm in the embodiment).
And a cylindrical wall 4a that covers and covers the gap S.
a having the same outer diameter as that of the bottom wall 4b.

A circular through hole 41 is formed at the center of the bottom wall 4b of the seat portion 5, and a non-slip portion 5 made of a grid-like ridge is projected from the lower surface of the bottom wall 4b. I have. The thickness of the wall of the seat 4 is greater than the thickness of the walls of the fitting cylinder 2 and the inclined cylinder 3, and the thickness of the wall of the inclination cylinder 3 is on the side of the fitting cylinder 2. From the seat part 4 side.

The inclination angle θ2 of the inclined wall 30 with respect to the axis of the fitting cylinder 2 is set to about 3 at about 20 degrees or more.
The angle is set to 5 degrees or less, and is set to 23 degrees in the embodiment shown in the figure. That is, according to the result of the experiment by the inventor of the present application, when the force in the pull-out direction acts on the cap, the inclined wall 3
It has been found that the smaller the inclination angle of 0 is, the more difficult it is for the cap to come off from the leg 1. However, as the inclination angle of the inclined wall 30 becomes smaller, the fitting cylindrical portion 2 and the large-diameter cylindrical portion 4 Is inevitably increased in the axial direction of the inclined tubular portion 3 connecting the two, and the overall length of the cap becomes longer than necessary.
As a result of the inventor's intensive research, it was found that the cap leg 1
When the length is almost the same as the entire length of the conventional cap while sufficiently preventing the disengagement from coming off, the inclination angle θ
2 has been found to be optimal from 23 degrees to 27 degrees, and it is 35 degrees when the inclination angle is 20 degrees or more.
It has also been found that if the temperature is lower than the predetermined value, the following predetermined effects can be sufficiently obtained.

In the embodiment shown in the drawings, the dimension H1 in the axial direction of the inclined cylinder 3 is the same as the dimension H2 in the axial direction of the fitting cylinder 2 and the dimension H3 in the axial direction of the seat 4, so that the entire cap is formed. I have a balance. Thus, in the above protective cap, even if it is formed of a soft rubber material and is elastically deformed, the axial dimension H1 of the inclined cylinder 3 is the same as the axial dimension H2 of the fitting cylinder 2 and the seat. The inclined wall 30 with respect to the axis L of the fitting cylinder A,
Is formed at 23 degrees, which is considerably smaller than a conventional cap of this type, so that, for example, the seat 4 is pulled in the direction of arrow X in FIG. Even when it acts on the cap, the inclined wall 30 of the inclined cylindrical portion 3 is unlikely to be displaced relative to the fitting cylindrical portion 2 and the seat portion 4 in the direction facing the same direction as the axis L of the fitting cylindrical portion 2.

Therefore, the phenomenon that the boundary portion 2a of the fitting cylinder portion 2 with the inclined cylinder portion 3 is pulled in a direction away from the outer peripheral surface of the leg 1 is more reliably suppressed than the conventional one shown in FIG. Then, the state in which the press-contact force of the fitting cylinder portion 2 to the leg 1 is sufficiently ensured is maintained, so that the cap does not easily come off from the leg. In the above embodiment, the protective cap is formed from a synthetic rubber material. However, the present invention is not limited to this. For example, the protective cap may be formed from a soft synthetic resin material.

In the above embodiment, the leg 1 of the table is used.
It was used by fitting to the end of the, but is not limited to this, for example, a chair, a sideboard, a bed,
The present invention may be applied to a protective cap which is used by being fitted to an end of a leg of a cabinet or the like. In the above embodiment, the axial dimension H1 of the inclined tubular section 3 is set to the axial dimension H of the fitting tubular section 2.
2 and the axial dimension H3 of the seat 4, but the axial dimension H1 of the inclined tubular section 3 is changed to the axial dimension H2 of the fitting tubular section 2.
And the axial dimension H3 of the seat 4 may be longer.

In the above embodiment, the protective cap is formed in a substantially cylindrical shape. However, the present invention is not limited to this. For example, as shown in FIG. You may.

[0018]

As described above, according to the first aspect of the present invention, the fitting tubular portion 2 closely fitted to the outer peripheral surface of the end of the leg 1, and the fitting tubular portion 2 is expanded from one end to the end. Increasing inclined wall 30
And a bottomed tubular seat portion 4 for closing the large-diameter side opening of the inclined cylinder portion 3.
The inclination angle of the inclined wall 30 with respect to the axis of
The angle is not less than 35 degrees and not more than 35 degrees, so that the inclined wall 30 of the inclined cylinder portion 3 can be fitted to the protective cap fitted to the end of the leg 1 even when a force in the direction of coming off from the leg 1 acts on the protective cap. It is difficult to displace in the direction facing the same direction as the axis L of the fitting cylinder 2 with respect to the part 2 and the seat 4, and the boundary 2 a between the fitting cylinder 2 and the inclined cylinder 3 is located on the outer periphery of the leg 1. Since the phenomenon of being pulled away from the surface is reliably suppressed, it is possible to reliably prevent the cap from accidentally coming off the leg.

According to the second aspect of the present invention, the axial dimension of the inclined tubular section 3 is made equal to or longer than the axial dimension of the fitting tubular section 2 and the seat section 4 so that the cap can be closed. Without making the overall length unnecessarily long, in other words,
While the balance of the entire cap is adjusted, the cap can be sufficiently prevented from coming off from the leg 1. According to the third aspect of the present invention, since the anti-slip portion 5 is provided on the lower surface of the seat portion 4, in addition to the effect of the first or second aspect of the present invention, the leg on which the protective cap is fitted is a floor surface. Can be reliably suppressed from slipping.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a protective cap of the present invention is attached to a leg.

FIG. 2 is a plan view of a protective cap according to the present invention.

FIG. 3 is a bottom view of the protective cap according to the present invention.

FIG. 4 is a plan view showing another embodiment of the protective cap according to the present invention.

FIG. 5 is a longitudinal sectional view of a conventional protective cap.

FIG. 6 is a longitudinal sectional view schematically showing a state in which a force in a detaching direction acts on a conventional protective cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leg 2 Fitting cylinder part 3 Inclined cylinder part 30 Inclined wall 4 Seat part 5 Non-slip part

Claims (3)

[Claims] An elastically deformable protective cap which is attached to an end of a leg (1) and covers the end of the leg (1),
An inclined cylindrical portion provided with a fitting cylindrical portion (2) closely fitted to the outer peripheral surface of the end of the leg (1), and an inclined wall (30) diverging from one end of the fitting cylindrical portion (2). (3) and a bottomed cylindrical seat (4) for closing the large-diameter side opening of the inclined cylinder (3), and the inclined wall (30) with respect to the axis of the fitting cylinder (2). A protection cap for a leg, wherein an inclination angle is set to be approximately 20 degrees or more and approximately 35 degrees or less. 2. An axial dimension of the inclined tubular section (3) is equal to or longer than an axial dimension of the fitting tubular section (2) and the bottom wall section (4). Leg protection cap. 3. The leg protection cap according to claim 1, wherein a non-slip portion is provided on a lower surface of the seat portion.