JP2982684B2 - leg - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg for supporting a top plate, and more particularly to a leg which has sufficient rigidity by simplification.

[0002]

2. Description of the Related Art Some legs constituting a desk or the like have a support rod called a stay or the like integrally provided above a leg element for supporting a top plate. In this method, the rear part of the upper support rod is fitted between the side walls of the hollow leg element, and the rear side wall of the upper support rod and the corresponding side wall of the leg element are rigidly connected by spot welding, The front portion of the support rod extends forward from the upper end of the front wall of the leg element, and the load on the top plate applied to the upper support rod is supported by the leg element.

[0003]

However, in the case of the leg having such a structure, two openings are provided on the upper wall of the upper support rod for spot welding, and a welding gun for spot welding is provided from the opening window. Must be inserted into the upper support rod, and welding is performed in a state where the side wall of the upper support rod and the side wall of the leg element are sandwiched by the electrodes. Therefore, when a large load is applied to the top plate and the load acts as a bending force on the entire upper support rod with the upper end of the front wall of the leg element as a fulcrum, the upper support rod is particularly plastically deformed around the fragile opening window. May bend.

In order to solve such a problem, it is conceivable to provide the opening window at a position as far as possible from the supporting portion at the upper end of the front wall, but this is insufficient as a means for compensating for insufficient strength. .

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been made to avoid forming an opening window for welding on the upper wall of the upper support rod, to secure a uniform thickness, In order to connect the support rod and the leg element, a kind of welded joint that does not require holding between members is adopted. Therefore, it is possible to effectively increase the rigidity of the upper support rod itself against bending stress while ensuring an appropriate mounting state of the upper support rod.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A leg according to the present invention is such that a rear portion of an upper supporting rod is fitted to a side wall of a hollow leg element, and the upper supporting rod and the leg element are connected to each other so that a ceiling hanging on the upper supporting rod is provided. In a structure in which a plate load is supported by a leg element, a projection is formed on an inner surface of the leg element, and an upper support rod has an upper wall having no opening window for welding, and a left and right side continuous with the upper wall. and the side wall of, and made by and a rear wall, the projection is fitted to the rear of the both side walls so as to be pressed against the outer surface of the side walls of the upper support扞between the side walls of the corresponding leg elements With
At the position where the rear wall is in contact with the rear wall of the leg element, a projection joint is formed through this projection to form a weld joint, and the upper support rod and the side wall of the leg element are joined to each other.

[0007] With this configuration, a substantially uniform thickness can be ensured at least in a portion of the upper wall of the upper support rod near the upper end of the front wall of the leg element. Thus, a locally fragile structure can be effectively avoided. In addition, even if the upper support rod has such a structure, the upper support rod and the leg element are joined via a welded joint that does not require pinching between members. Not forming an opening window for welding on the upper wall does not cause any trouble in performing welding.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a single-sleeve type desk B to which the present invention is applied.
The top plate D of this desk has one side edge supported by the leg A according to the present invention, and the other side edge supported by the sleeve C.

The leg A has a support 1, an upper stay 2 and a lower stay 3, and the load applied to the upper stay 2 is supported by the lower stay 3 via the support 1. The strut 1 plays a role as a leg element of the present invention, and as shown in FIGS.
, A front wall 13 and a rear wall 14. One side wall 11 is, as shown in FIGS. 3 and 6,
The front part 11a and the rear part 11b are separated, and the front side wall 11a, the front wall 13, the side wall 12, the rear wall 14, and the rear side wall 1 are provided.
1b is integrally formed by bending a single sheet metal material to form the support 1. In addition, both ends of the sheet metal matching on the side walls 11a and 11b at the time of the bending forming are further bent inward from the corresponding portions, and
Partition walls 15, 16 as shown in FIG. 2 and FIG. The tip of at least one of the partitions 15, 16 is disposed at a position in contact with or close to the inner surface of the side wall 12 located at the facing position to prevent sticking of the column 1, Upper ends 15a and 16a of the partition walls that support the lower surface of the rear portion of the upper stay 2 to be described later are formed at a position lower than the upper end of the partition 12. In addition, these partition walls 15 and 16 may be fixed to each other at appropriate positions. On the upper end side of the front wall where the side walls 11 and 12 and the front wall 13 are gathered, the upper stay 2 is attached to the support 1.
A notch 10 is formed for insertion in a positioning state. The notch 10 is formed with a bent piece 13a bent rearward and upward from the front wall 13, and the upper surface thereof is formed at the same height position as the partition upper ends 15a and 16a. It has an abutment surface to support. The ends of the sheet metal matching between the side walls 11a and 11b are provided with CO ₂ at three places as shown in FIG.
A weld joint 4 is provided by welding.

The upper stay 2 serves as an upper support rod of the present invention. As shown in FIGS. 2 and 8 to 11, a pair of side walls 21, an upper wall 22, and a bottom wall 23 are provided. ,
It has a substantially rectangular pipe shape with a rear wall 27 and is integrally formed by bending a single sheet metal material. The outer dimension between the side walls 21 and 21 of the upper stay 2 is set slightly smaller than the inner dimension between the side walls 11 and 12 of the column 1, and the vertical dimension of the side wall 21 is folded from the upper end of the column 1. The dimension substantially corresponds to the dimension up to the upper surface of the bent piece 13a and the dimension from the upper end to the partition upper ends 15a and 16a.
Then, the rear part of the upper stay 2 is attached to the support side wall 1.
1 and 12 are fitted closely, and the bottom wall 23 is
a and the upper ends 15a and 16a of the partition walls. In the center of the bottom wall 23 of the upper stay 2,
An opening 24 is formed along the longitudinal direction.
An inner wall 23a that rises from the bottom wall 23 is integrally provided so as to sandwich the base 4 therebetween. The opening 24 is necessary when a bolt fastening operation is performed on the top plate D mounted on the upper stay 2 or the like. In this embodiment, even if such an opening 24 is provided, the opening 24 is provided on both sides thereof. By making the inner wall 23a provided upright function as a rib, the strength of the entire stay is maintained. Conventionally, at the upper wall 22 of the upper stay 2 near the upper part of the front wall of the column 1, there are provided two large-diameter windows through which a spot welding gun can be inserted and withdrawn. Although the welding is performed by the welding gun through the opening window, in the present embodiment, such an opening window is not provided on the upper wall 22, and a substantially uniform thickness is secured over the entirety. Things. In the drawing, reference numeral 22a denotes a hole used for transportation in the manufacturing process of the upper stay 2, which is much smaller than the conventional welding hole in the vicinity of the longitudinal end, and is bent. It does not affect the strength against stress. Similarly, the front end of the upper wall 22 of the upper stay 2 has a top plate mounting hole 22b that does not affect the strength against bending stress.

When the support 1 and the upper stay 2 are connected to each other, as shown in FIGS.
And the side wall 21b of the upper stay 2 is inserted between the corresponding side walls 11, 12 of the column 1. At the same time, the rear wall 27 of the upper stay 2 is positioned in contact with the inner surface of the rear wall 14 of the column 2 as shown in FIGS. 2 to 5, and the lower end of the bottom wall 23 is bent at the notch 10. The upper surface of the piece 13a and the upper ends 15a and 16a of the partition walls are in contact with each other. Then, the side walls 11 and 12 of the column 1 corresponding to the rear side wall 21 of the upper stay 2.
2 and 7 are rigidly connected via a welding joint 5 by projection welding which does not require holding between members. In order to perform such welding, projections 11a and 12a are formed on the inner surface near the upper ends of the left and right side walls 11 and 12 of the support column 1 by previously raising a part of the member. In the fitted state, pressure is applied between the side plates 11 and 13 so that these protrusions 11a and 12a are pressed against the outer surfaces of the corresponding side walls 21 of the upper stay 2, and in this state, the space between the column 1 and the upper stay 2 is formed. The protrusions 11a and 12a are melted by applying a current from an appropriate position to the side walls 21 of the upper stay 2 and the side walls 11 and 12 of the column 1 are welded. In addition, in this embodiment, the lower surface of the middle portion of the bottom wall 23 of the upper stay 2 and the front wall 13 of
3 and 4 is rigidly connected via a welding joint 6 formed by arc welding as shown in FIGS. As a result, the rear portion of the upper stay 2 is firmly connected to the side walls 11, 12 and the front wall 13 of the column 1 in a positioned state.

A pin 25 protrudes from the rear end of the upper wall 22 of the upper stay 2. When the top plate D is mounted on the upper stay 2, a pin (not shown) provided on the lower surface of the top plate is provided. the holes in the large-diameter hole and fitted into the pin 25 and bears against the top plate lower surface in the upper wall 22 of the upper stay 2, the small pin 25 potbelly hole by directly sliding the top plate 2 to the rear < br /> in the transition position to the holes of the diameter, it is fastened to the lower or we insert the bolt into the hole 22b which is provided on the top wall 22 of the upper stay 2 to the top plate lower surface. At this time, the resin cap 26 (see FIG. 2) for covering the front end opening of the upper stay 2 is also attached.

With the above structure, the upper stay 2
A uniform thickness is secured in at least a portion of the upper wall 22 where a large bending stress is applied by the top plate load, that is, the upper wall 22 near the bent piece 13a which is a point of direct application of the bending stress. be able to. For this reason, compared with the conventional case where an opening window for spot welding is provided, there is no portion that is locally vulnerable to bending stress, and the entire upper stay 2 has high strength by utilizing the rigidity of the member itself. Can be secured. Moreover, even when the upper stay 2 has such a structure, the upper stay 2 and the column 1 are connected by the above-described prosection welding joint 5, and this welding directly clamps the electrode by directly applying an electrode between the members. Since there is no need for this, it is not inconvenienced in the manufacture of the legs that the opening window for welding is not formed in the upper wall 22 of the upper stay 2.

In addition to the above, the upper stay 2 of the present embodiment
Just bends the sheet metal into a roughly square pipe shape,
Since the strength in the longitudinal direction is given by providing the inner wall 23a functioning as a rib, the upper stay 2
The number of parts can be reduced in the configuration, and welding and the like of the parts themselves are not required, so that the number of steps can be reduced. further,
In the present embodiment, the structure of the column 1 itself is also completed by forming the column 1 by simply pressing or rolling a single sheet metal material, so that the effect of reducing the number of parts and man-hours is further enhanced. Is possible.

The specific configuration of each unit is not limited to the above embodiment. For example, it is of course effective to apply the same configuration as the above embodiment between the lower stay 3 and the support. The lower stay 3 shown in FIG. 3 has an opening facing upward, opposite to the upper stay 2, and a portion extending forward from the support 1 is concealed by a cover 3a. When the projection welding 50 is applied between the side wall 31 of the lower stay 3 and the side plates 11 and 12 of the column 1 at the fitting portion of the lower stay 3, it is necessary to provide a hole for welding particularly in the bottom wall 33 of the lower stay 3. Can be eliminated. In the above embodiment, a bent piece bent inward may be provided at the upper ends of the side walls 11 and 12 of the column 1, and the upper stay 2 may be inserted through the lower surface of the bent piece. By doing so, the upper stay 2 is supported by the support 1
As a result, the load on the welded joint can be reduced, and the connection strength can be more effectively increased.

Other configurations can be variously modified without departing from the spirit of the present invention.

[0017]

The present invention is embodied in the form described above and has the following effects. That is, the leg of the present invention secures a uniform thickness by stopping forming an opening window for welding on the upper wall of the upper supporting rod , forms a projection on the inner surface of the leg element, and the projection is formed by the upper supporting rod. The rear portions of the side walls are fitted between the side walls of the corresponding leg elements so as to be pressed against the outer surfaces of the both side walls of the upper support rod, and the rear wall of the upper support rod is mounted on the leg.
Projection welding, which does not require pinching between members, is used to connect the upper support rod to the leg element by abutting against the rear wall of the element, resulting in an increase in the number of parts and the number of manufacturing steps. Therefore, an extremely useful effect that an appropriate mounting state of the upper support rod and high rigidity against bending stress can be ensured can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a desk to which an embodiment of the present invention is applied.

FIG. 2 is an exploded perspective view showing the legs of the embodiment.

FIG. 3 is a side view of the same.

FIG. 4 is a plan view of the same.

FIG. 5 is a front view of the same.

FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 3;

FIG. 7 is an enlarged sectional view taken along line VII-VII in FIG. 3;

FIG. 8 is an exploded sectional view corresponding to FIG. 7;

FIG. 9 is a plan view showing the upper stay of the embodiment.

FIG. 10 is a side view of the same.

FIG. 11 is a bottom view of the same.

[Explanation of symbols]

 A: Leg 1 ... Leg element (post) 2 ... Upper support rod (upper stay) 5 ... Weld joint (projection weld joint) 11, 12 ... Side wall 21 ... Side wall 22 ... Upper wall

Claims (1)

(57) [Claims] 1. A rear portion of an upper support rod is fitted to a side wall of a hollow leg element, and the upper support rod and the leg element are connected to each other so that a top plate load applied to the upper support rod is supported by the leg element. In such a configuration, a projection is formed on the inner surface of the leg element, and the upper support rod includes an upper wall having no opening window for welding, left and right side walls connected to the upper wall, and a rear wall . shall become and includes, to fit the rear part of the both side walls said projections so as to be pressed against the outer surface of the side walls of the upper support扞between the side walls of the corresponding leg elements
At the position where the rear wall is in contact with the rear wall of the leg element, projection welding is performed through this projection to form a weld joint, and the upper support rod and the side wall of the leg element are joined together. Legs characterized by becoming.