JP2987629B1 - Leg end structure of desk, chair, etc. and method of replacing leg end cap - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To improve a cap for protecting a pipe leg end of a desk, a chair, or the like, to easily attach the cap, and to easily replace the cap by using the wear of the cap itself when replacing the cap. Provide a structure such as a cap. SOLUTION: An outer diameter s of an inner cap 2 is formed to have a size to be fitted to a pipe leg 1, and a lower end portion thereof is wearable and has a lower end protruding portion having a larger height than the outer diameter s and a predetermined height h. 3 was formed. The hollow interior of the outer cap 4 is formed in an insertion hole 5 having an inner diameter m into which the pipe leg 1 can be inserted, and a portion immediately below the inner portion is formed as a step-shaped insertion portion 6 having an inner diameter smaller by the thickness p of the pipe leg 1. A lower end portion of the outer cap 4 is formed in a lower end fitting portion 7 which is wearable and bulges downward by the same height h as the lower end protruding portion 3 of the inner cap 2, and the hollow inside thereof is at least a step-shaped fitting portion. The inner diameter k was larger than that of the portion 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of caps and the like used to protect the ends of pipe legs constituting frames of desks, chairs, shelves, cabinets, etc.
In particular, the present invention relates to a technique for rationally and easily replacing the cap worn by aging.

[0002]

2. Description of the Related Art Conventionally, a protective cap used for a leg end of a frame pipe such as a desk or a chair has to be attached so that the floor cap may not be detached from the pipe leg during use and the floor may be damaged or injured. In general, it is fixed by press fitting into a pipe leg or by fastening with a screw or a rivet.

When it becomes necessary to remove the cap firmly fixed to the pipe leg as described above, the only option is to cut it off with a cutter or pliers and pull it out.

[0004]

The protective cap used at the end of a pipe leg such as a desk or a chair does not hinder the use for a while if it is firmly attached to the pipe leg as described above.

However, if the cap repeatedly wears with the ground floor due to long-term use, and the cap gradually wears down from below and the lower end of the pipe leg almost hits the floor, the cap is quickly replaced. Otherwise, the desks and chairs become virtually unusable.

In the conventional method, since the cap is firmly fixed to the end of the pipe leg, removing and replacing the cap requires a great deal of labor and time using a cutter, pliers, or the like. However, this point is a problem to be solved.

Accordingly, an object of the present invention is to improve a cap used for protecting the end of a pipe leg of a desk or a chair so that the cap can be easily attached, and when the cap is replaced, wear of the cap itself is reduced. An object of the present invention is to provide a structure such as a cap which can be easily replaced by using the same and a rational replacement method thereof.

[0008]

According to another aspect of the present invention, there is provided a desk, chair or other leg end structure according to the first aspect of the present invention. An outer cap is attached, and the inner cap is fitted inside the outer cap and the pipe leg. The outer diameter of the inner cap is formed to a size that fits the pipe leg. The lower end of the outer cap is formed as a lower end protruding portion having a predetermined height and being larger than the outer diameter, and the hollow inside of the outer cap has a pipe leg having an inner diameter into which a pipe leg can be inserted from above. It is formed in an insertion hole, a portion directly below the pipe leg insertion hole 5 is formed as a step-shaped insertion portion having an inner diameter smaller by the thickness of the pipe leg, and a lower end portion of the outer cap is wearable. Lower end of the inner cap The lower end fitting portion bulged downward by the same height as the protruding portion is formed, and the hollow interior of the lower end fitting portion is formed with an inner diameter larger than at least the step-like fitting inserting portion. I do.

According to a second aspect of the present invention, there is provided a leg end structure for a desk, a chair or the like according to the first aspect of the present invention, wherein the inner cap fitted to the lower end inner peripheral surface of the pipe leg falls off. It is characterized in that the preventing projection is provided inward.

[0010] A leg end structure for a desk, a chair or the like according to the third aspect of the invention is characterized in that, in the first aspect of the invention, the outer cap and the inner cap are formed of synthetic resin or rubber. And

According to a fourth aspect of the present invention, there is provided a leg end structure for a desk, a chair or the like according to the first or third aspect of the present invention, wherein a cap or the like is formed on the outer peripheral upper end edge of the lower end fitting portion of the outer cap by a groove or the like. It is characterized in that an exchange instruction portion serving as a mark of exchange is formed.

According to a fifth aspect of the present invention, there is provided a method for replacing a leg end cap of a desk, a chair, or the like, comprising a hollow outer cap made of synthetic resin or rubber attached to an end of a pipe leg of a desk, a chair, or the like. A reasonable replacement of the outer cap and the inner cap of synthetic resin or rubber fitted into the end of the pipe leg, comprising: a) fitting on the inner peripheral surface at the lower end of said pipe leg; A protrusion for preventing the inner cap from falling off is provided inward.

B) The outer diameter of the inner cap is formed to be large enough to fit into the pipe leg, and the lower end thereof is formed as a lower end protruding portion which is frictional and is larger than the outer diameter and has a predetermined height. .

C) The hollow inside of the outer cap is formed in a pipe leg insertion hole having an inside diameter into which a pipe leg can be inserted from above,
The portion directly below the pipe leg insertion hole is formed as a step-shaped insertion portion having an inner diameter smaller by the thickness of the pipe leg, and is positioned below the lower end of the outer cap by the same height as the lower end protrusion of the inner cap. The lower end fitting portion is formed to protrude from the lower portion, the hollow inside thereof is formed to have an inner diameter larger than at least the step-like fitting inserting portion, and a replacement instruction portion is formed at the outer peripheral upper end edge of the lower fitting portion.

D) With the lower end of the pipe leg inserted into the pipe leg insertion hole of the outer cap, and with the pipe leg abutting the stepped insertion portion, the inner cap is inserted into the lower end insertion portion of the outer cap. And fit it to the projection inside the pipe leg.

E) performing a new replacement of the inner cap and the outer cap by using the state in which the inner cap and the outer cap have worn down near the replacement instruction portion of the outer cap due to long-term use as a guide for replacing the cap; Are characterized.

According to a sixth aspect of the present invention, there is provided a method for replacing a leg end cap of a desk, a chair or the like according to the fifth aspect of the present invention, wherein the outer end cap is worn down to the vicinity of the outer cap replacement instruction portion by use. After removing the worn outer cap, inserting a new outer cap into the end of the pipe leg, and leaving the inner cap, which has become only the main body portion, in the pipe leg, a new inner cap is formed. Is pressed into the end of the pipe leg to replace the inner cap.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The leg end structure according to the first aspect of the present invention is a pipe leg 1 constituting a frame such as a desk, a chair or a shelf.
In order to protect the lower end portion from being rubbed and scratched between the ground floor surface 9 and the inner cap 2, a hollow outer cap 4 is preferably used in the following embodiment (see FIG. 1). .
The outer cap 4 (particularly, a lower end fitting portion 7 described later) and the inner cap 2 (particularly, a lower end protruding portion 3 described later) are preferably formed of a synthetic resin or rubber so as to be wearable. (Claim 3).

As shown in FIG. 4C, the inner cap 2 has an outer diameter s which is sized to fit into the pipe leg 1 of FIG. 4A. The lower end is formed in a lower end protruding portion 3 having a predetermined height h larger than the outer diameter s and allowing abrasion.

As shown in FIG. 4B, the outer cap 4 has a pipe leg insertion hole 5 having an inner diameter m slightly larger than the outer diameter g of the pipe leg 1 so that the pipe leg 1 can be inserted from above. (Therefore, there is a slight gap between the insertion hole 5 and the pipe leg 1). A portion immediately below the step-shaped fitting portion 6 having an inner diameter smaller by the thickness p of the pipe leg 1 is formed. Is formed. The lower end of the outer cap 4 is made of the above-mentioned synthetic resin or rubber, so that it can be worn and has the same height h as the lower end protrusion 3 of the inner cap 2.
The lower end fitting portion 7 bulges downward by a distance.
The hollow interior of the lower end fitting portion 7 is formed to have an inner diameter k which is at least larger than the step fitting portion 6 and slightly larger than the inner diameter t of the lower end protruding portion 3 of the inner cap 2.

The lower end fitting portion 7 of the outer cap 4
If an exchange instructing portion 8 that can be visually judged by a groove or a convex portion in the illustrated example is formed at the upper end edge of the outer periphery of FIG.
The replacement instructing section 8 serves as a guide for replacing the cap, and there is no fear that the pipe leg 1 may inadvertently damage the floor surface 9 in a timely manner when replacing the cap (claim 4).

As described in the second aspect of the present invention, a projection 1a is provided inwardly on the inner peripheral surface of the lower end of the pipe leg 1 to prevent the inner cap 2 to be fitted from falling off as described later. This is desirable (FIG. 4A).

Accordingly, in order to attach the inner and outer caps 2 and 4 to the lower end of the pipe leg 1, first, the lower end of the pipe leg 1 is inserted into the pipe leg insertion hole 5 of the outer cap 4 from above. Since the lower end of the pipe leg 1 comes into contact with the upper edge of the step-shaped insertion portion 6 of the outer cap 4 by insertion, the inner cap 2 is fitted into the lower end insertion portion 7 of the outer cap 4 in the contact state. If you insert it, the inner cap 2
Is fitted into the projection 1a in the pipe leg 1, and the inner cap 2 is securely fitted without falling off (see FIG. 1).

The cap 2,
When the cap 4 is worn out and the cap is replaced, the cap can be easily replaced in the following manner.

As shown in FIG. 2, the outer cap 4
The lower end fitting portion 7 and the lower end protruding portion 3 of the inner cap 2 are worn to the vicinity of the replacement instructing portion 8, but the lower end of the pipe leg 1 is located above the replacement instructing portion 8 in the outer cap 4. Since it is locked to the upper end edge of the step-shaped insertion portion 6, it does not fall down to the floor surface 9 and damage the floor surface 9.

On the other hand, since the outer cap 4 has the above-mentioned gap (clearance) between the outer cap 4 and the pipe leg 1, the outer cap 4 can be dropped down. Therefore, when replacing the cap, the outer cap 4 can be easily removed simply by lifting the pipe leg 1 upward (see FIG. 2).

The main body 2a of the inner cap 2
After attaching a new outer cap 4 in a state of being left inside the pipe leg 1 as shown in FIG. 3, the new inner cap 2 is pushed into the inside of the pipe leg 1. Then, the main body portion 2a of the inner cap 2 left inside the pipe leg 1 is replaced with a new inner cap 2 (main body portion 2a).
As a result, the inner cap 2 can be easily attached (replaced).

The inner cap 2 worn as described above is used.
It is of course possible to remove the main body portion 2a of the pipe leg 1 without leaving it inside the pipe leg 1 and replace the cap in the above-described manner.

[0029]

According to the leg end structure of a desk, a chair or the like and the method of exchanging the leg end cap according to the first and fifth aspects of the present invention, an outer cap is attached to a pipe leg end of a desk or a chair. The inner cap is easily attached. At this time, if the projection is provided on the inner peripheral surface of the lower end of the pipe leg so as to face inward, the inner cap (and the outer cap) can be prevented from being accidentally dropped off, and the safety can be secured. Contributes to improved use.

When replacing the cap, the wear of the outer cap (lower end insertion portion) and the inner cap (lower end protrusion) made of synthetic resin or rubber can be used as a rational measure. The replacement work can be performed easily and easily. In particular, the cap replacement is completed only by pushing in a new inner cap while leaving the main body portion of the inner cap, whose lower end protruding portion has been worn away and lost in the pipe leg, as in the invention of claim 6. Very convenient.

Further, if the replacement instructing portion is formed on the outer peripheral upper end edge of the lower end fitting portion of the outer cap as in the invention according to the fourth aspect, the time for replacing the cap due to wear can be determined at a glance. It is possible to prevent floor scratches and unexpected accidents caused by pipe legs that may be overlooked.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an outer cap and an inner cap attached to a pipe leg end.

FIG. 2 is a sectional view showing a worn state of a cap in FIG. 1;

FIG. 3 is a partially cutaway sectional view showing a procedure for replacing an inner cap.

4A is a front view showing an end structure of a pipe leg, FIG. 4B is a front view of an outer cap, and FIG. 4C is a front view of an inner cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe leg 1a Projection part 2 Inner cap 2a Main body part 3 Lower end protruding part 4 Outer cap 5 Pipe leg insertion hole 6 Step-shaped insertion part 7 Lower end insertion part 8 Exchange instruction part

Claims (6)

(57) [Claims] 1. A leg end structure in which a hollow outer cap is attached to an end of a pipe leg such as a desk or a chair, and an inner cap is fitted inside the outer cap and the inside of the pipe leg. The outer diameter of the inner cap is formed to have a size that fits into the pipe leg, and the lower end thereof is formed as a wearable lower end protruding portion having a predetermined height larger than the outer diameter. The hollow interior of the cap is formed in a pipe leg insertion hole having an inner diameter into which a pipe leg can be inserted from above, and a portion immediately below the pipe leg insertion hole is formed in a step-shaped insertion portion having an inner diameter smaller by the thickness of the pipe leg. The lower end of the outer cap is wearable, and is formed in a lower end fitting portion bulging downward by the same height as the lower end protruding portion of the inner cap. Is at least the step shape A leg end structure for a desk, chair, or the like, which is formed to have an inner diameter larger than the fitting portion. 2. The desk, chair or the like according to claim 1, wherein a projection for preventing the fitted inner cap from falling off is provided on an inner peripheral surface of a lower end of the pipe leg. Leg end structure. 3. An outer cap and an inner cap are made of synthetic resin or rubber.
Leg end structure of desks, chairs, etc. described in. 4. The desk according to claim 1, wherein a replacement instruction portion serving as a mark for replacing the cap is formed on an outer peripheral upper end edge of the lower end fitting portion of the outer cap.
Leg end structure such as chair. 5. A hollow outer cap made of synthetic resin or rubber attached to an end of a pipe leg of a desk or chair, and a synthetic resin or rubber fitted into the outer cap and the end of the pipe leg. A) a protrusion for preventing the fitted inner cap from falling off is provided inward on an inner peripheral surface of a lower end of the pipe leg; b) an outer diameter of the inner cap Is formed in a size that can be fitted to the pipe leg, and a lower end portion thereof is formed as a lower end protruding portion that is frictionable and that is larger than the outer diameter and has a predetermined height. C) The hollow inside of the outer cap Is formed in a pipe leg insertion hole having an inside diameter into which a pipe leg can be inserted from above, and a portion immediately below the pipe leg insertion hole is formed in a step-shaped insertion portion having an inside diameter smaller by the thickness of the pipe leg, and At the bottom of the cap A lower end fitting portion bulging downward by the same height as the lower end projecting portion of the inner cap is formed, and the hollow interior is formed to have an inner diameter larger than at least the step-like fitting inserting portion, and the lower end fitting portion is formed. A replacement instruction portion is formed at the upper edge of the outer periphery of the outer cap; d) A state in which the lower end portion of the pipe leg is inserted into the pipe leg insertion hole of the outer cap, and the pipe leg is brought into contact with the step-shaped insertion portion. Then, the inner cap is inserted into the lower end fitting portion of the outer cap and fitted to the projection inside the pipe leg. E) The inner cap and the outer cap are worn down to near the replacement instruction portion of the outer cap by use. A method of replacing a leg end cap of a desk, a chair, or the like, characterized in that replacement of a new inner cap and an outer cap is performed as a guide for cap replacement. 6. When the outer cap is worn down to the vicinity of the replacement instruction portion of the outer cap by use, the worn outer cap is detached, a new outer cap is inserted into the end of the pipe leg, and only the main body portion is formed. The replacement of the inner cap by pushing a new inner cap into the end of the pipe leg with the inner cap left in the pipe leg, and replacing the inner cap with the desk, chair or the like according to claim 5, wherein How to replace the leg end cap.