JP6576978B2 - Top plate and leg connection structure - Google Patents

Description

  The present invention relates to a structure for connecting a top plate and a leg that can be easily and inexpensively manufactured with a simple configuration and can firmly connect the top plate and a leg.

  Conventionally, in a structure in which a bracket is attached to the lower surface of the table top plate and a leg is detachably connected to the bracket, a tapered engagement hole is provided in the bracket, and the upper end of the leg is engaged with the engagement hole. A connecting portion of the bracket or leg is provided, a screw portion is provided at one connecting portion of the bracket or the leg, and a cylindrical connecting ring is detachably screwed into the screw portion, so that the other connecting portion of the bracket or the leg is connected. There is a structure in which a locking part is provided, and the opening edge of the coupling ring is engaged with the locking part to prevent the leg from being detached, and the leg is attached manually without requiring a tool such as a spanner (for example, Patent Document 1).

  However, the connection structure can maintain the close contact state between the tapered engagement hole and the tapered connection portion by screwing the connection ring into the screw portion of the bracket. There is a limit, and there is a possibility that the adhesive strength is lowered by use over time, and rattling occurs.

  In order to solve the above problem, a pedestal is attached to the corner portion of the top plate via a taper engaging portion, and the pedestal is provided with a pair of arms provided at the upper end portion. -The taper engaging part is arranged on both side edges sandwiching the inner part, and the taper engaging part has a concave tapered surface on either one of both side edges of the top plate or the arm of the pedestal and a convex tapered surface provided on the other side. Slide the pedestal to one end of the top plate, engage the convex taper surface with the concave taper surface, and attach the bolt to the bottom of the concave taper surface. There is one in which the provided nut portion is screwed and tightened (for example, see Patent Document 2).

  However, the connecting mechanism between the top plate and the pedestal is such that a side edge having a concave tapered surface in which a steel plate is formed in a substantially V-shaped cross section is attached to a corner portion of the top plate, and a nut portion is attached to the bottom of the concave tapered surface. In addition, a back plate with a convex taper surface in which the steel plate is formed in a substantially chevron cross section is provided, and this pair of back plates is arranged perpendicular to the upper end of the pedestal, making the manufacture of components complicated and laborious. In addition, since this structure is limited to the connection of a single pedestal that supports the top plate, there is a problem that it is not suitable for mass production and is expensive.

  Therefore, as a solution to these problems, conical fitting holes are provided at the four corners of the top plate, screw parts are provided at the back, and conical joints are attached to the upper end of the legs, There is a leg mounting structure in which a tip end of a bolt is protruded from a part, the joint material is inserted into a fitting hole, and the tip end of the bolt is screwed into a screw part to attach a leg (for example, Patent Document 3). reference).

  However, the mounting structure of the leg is connected by pressing the joint taper surface to the taper surface of the fitting hole by turning when the leg is mounted. There has been a problem that the screwed state of the threaded portion of the bolt and the threaded portion of the fitting hole is lowered, and the mounting of the leg is loose.

Japanese Patent Laid-Open No. 11-225828 Japanese Patent No. 2720719 Japanese Patent No. 2885128

  An object of the present invention is to solve such a problem, and to provide a connection structure between a top plate and a leg that can be easily and inexpensively manufactured with a simple configuration and can firmly connect the top plate and the leg.

  According to the first aspect of the present invention, in the top plate-to-leg connecting structure in which the upper end portion of the leg is disposed on the lower surface of the top plate, a tubular lower frame is attached to the lower surface of the top plate and can be inserted into the end portion of the lower frame. A joint provided with a joint and a plate-like wedge piece is provided, the wedge piece forms a tapered surface on the upper surface, lower surface or upper and lower surfaces thereof, and an engagement hole into which a pair of wedge pieces can be inserted into the upper end portion of the leg And a taper surface that can be engaged with the taper surface of the wedge piece is formed on the upper surface, the lower surface, or the upper and lower surfaces of the engagement hole, and the pair of pairs are formed on the taper surfaces of the engagement hole. The taper surface of the wedge piece is inserted so as to be engageable, and a bolt can be inserted into the joint portion of the pair of wedge pieces, and the screw shaft of the bolt is screwed into a screw hole formed in the inner part of the engagement hole. When a pair of wedge pieces are attached to the engagement hole so as to be press-contactable, and the lower frame and the top plate are connected via the joint, Furthermore, the wedge effect of the pair of wedge pieces is obtained by inserting the tapered surface of the wedge piece into the engagement hole so as to be engageable with the taper surface in the engagement hole, and pressing the pair of wedge pieces into the engagement hole via bolts. By connecting the joint and the overhang joint, the top plate and the leg can be firmly connected.

According to a second aspect of the present invention, a taper surface is formed on one side peripheral surface of the pair of wedge pieces, a taper surface is formed on both left and right side surfaces in the engagement hole, and a taper surface of the side peripheral surface of the wedge piece is formed. Is inserted into the engagement hole so as to be engageable with the taper surfaces on both the left and right side surfaces, and the taper surface formed on one circumferential surface of the wedge piece is engaged with the taper surfaces on the left and right side surfaces formed in the engagement hole. The pair of wedge pieces are pressed into the engagement holes via bolts so that they can be strongly connected by the wedge effect between the pair of wedge pieces and the tapered surface in the engagement hole.
According to a third aspect of the present invention, a taper surface is formed on the upper and lower surfaces and one side peripheral surface of the pair of wedge pieces, and taper surfaces are formed on the upper and lower and left and right side surfaces in the engagement hole. The wedge pieces are inserted into the engagement holes so as to be engageable with each other, and the wedge effect of the two kinds of taper surfaces provided in the wedge pieces and the engagement holes is combined to make the wedge pieces and the engagement holes. It can be firmly connected.
A fourth aspect of the present invention, the joint is provided on one end portion of the joint, the wedge piece is provided on the other end, a joint for connecting the lower frame attached to the lower surface of the top plate, engages a protruding joint provided in the leg The top plate and the leg can be easily connected via a wedge piece to be inserted.

In the invention of claim 5, the end portions of the two lower frames are spaced apart from each other on the lower surface of the top plate, joint joints are inserted into the end portions of the respective lower frames, and the joint portions of the wedge pieces of the respective joints are inserted. The pair of wedge pieces are arranged so that the inner side surfaces of the pair of wedge pieces can be opposed to each other, and the pair of wedge pieces are assembled compactly and orderly.
According to a sixth aspect of the present invention, a concave groove into which a bolt can be inserted is disposed opposite to a joint portion between a pair of wedge pieces, and a bolt insertion hole is formed facing the concave groove.
According to the seventh aspect of the present invention, a notch groove into which a finger can be inserted is formed at one end of a joint portion of a pair of wedge pieces, a pair of wedge pieces are arranged to face each other, a bolt is inserted between them and screwed into a screw hole. At that time, a finger is inserted into the notch groove to enable screwing of the bolt.

According to an eighth aspect of the present invention, a guide groove and a convex guide that are engageable with each other are formed at one end of a joint portion of a pair of wedge pieces so as to be opposed to each other, and the pair of wedge pieces is prevented from being displaced. Can be reliably and safely inserted into the engagement hole.
According to a ninth aspect of the present invention, the taper angles of the upper, lower and side taper surfaces of the wedge pieces are the same or different, and the contact surface pressure or adhesion force of the wedge pieces with respect to the engagement holes can be adjusted. .
In the invention of claim 10, the taper angles of the upper surface, the lower surface, or both the left and right taper surfaces in the engagement hole are the same or different, and the contact surface pressure or adhesion force in the vertical direction or the horizontal direction with respect to the wedge piece is adjusted. Adjustable.
In the invention of claim 11, the taper angles of the upper and lower tapered surfaces in the engagement holes are made larger than the taper angles of the left and right tapered surfaces, and the contact pressure of the left and right wedge pieces is set to the upper and lower surfaces and the engagement holes. The contact pressure between the inner upper and lower surfaces is increased, the holding force for the left and right surfaces is increased, and the adhesion force of the wedge pieces is enhanced.

  According to the first aspect of the present invention, a tubular lower frame is attached to the lower surface of the top plate, and a joint including a joint that can be inserted and a plate-like wedge piece is provided at the end of the lower frame, An overhang joint having a tapered surface formed on the lower surface or its upper and lower surfaces and an engagement hole into which a pair of wedge pieces can be inserted is attached to the upper end of the leg, and the upper surface, lower surface or upper and lower surfaces in the engagement hole. A taper surface engageable with the taper surface of the wedge piece, and the taper surfaces of the pair of wedge pieces are inserted into the taper surfaces of the engagement holes so as to be engageable with each other. Since the bolt is provided so that the bolt can be inserted, and the screw shaft is screwed into the screw hole formed in the inner part of the engagement hole, and the pair of wedge pieces are attached to the engagement hole so as to be press-contactable, Connects the lower frame and the top plate and engages the taper surface of the wedge piece with the taper surface in the engagement hole. The pair of wedge pieces are pressed into the engagement holes via bolts, the joint and the extension joint are connected by the wedge effect of the pair of wedge pieces, and the top plate and the leg are firmly connected. Can do.

According to a second aspect of the present invention, a taper surface is formed on one side peripheral surface of the pair of wedge pieces, a taper surface is formed on both left and right side surfaces in the engagement hole, and a taper surface of the side peripheral surface of the wedge piece is formed. Is inserted to be able to engage with the tapered surfaces on both the left and right side surfaces in the engagement hole, so that the tapered surface formed on one circumferential surface of the wedge piece is engaged with the tapered surfaces on both the left and right side surfaces formed in the engagement hole. Then, the pair of wedge pieces can be pressed into the engagement hole via the bolt, and can be strongly connected by the wedge effect between the pair of wedge pieces and the tapered surface in the engagement hole.
According to a third aspect of the present invention, a taper surface is formed on the upper and lower surfaces and one side peripheral surface of the pair of wedge pieces, and taper surfaces are formed on the upper and lower and left and right side surfaces in the engagement hole. Since each of the tapered surfaces in the engagement hole is inserted to be engageable with each other, the wedge effect of the two types of tapered surfaces provided on the wedge piece and the engagement hole is caused to act in a composite manner. Can be firmly connected.
A fourth aspect of the present invention, the joint is provided on one end portion of the joint, engagement because provided the wedge piece at the other end, a joint for connecting the lower frame attached to the lower surface of the top plate, the protruding joint provided in the leg The top plate and the leg can be easily connected via the wedge piece inserted in such a manner that they can be joined together.

In the invention of claim 5, the end portions of the two lower frames are spaced apart from each other on the lower surface of the top plate, joint joints are inserted into the end portions of the respective lower frames, and the joint portions of the wedge pieces of the respective joints are inserted. Since they are joined and arranged, the inner side surfaces of the pair of wedge pieces can be opposed to each other, and the pair of wedge pieces can be assembled compactly and orderly.
According to the sixth aspect of the present invention, since the concave grooves into which the bolts can be inserted are arranged to face each other at the joint portion of the pair of wedge pieces, the bolt insertion holes can be formed by facing the concave grooves.
In the invention of claim 7, since a notch groove into which a finger can be inserted is formed at one end of the joint portion of the pair of wedge pieces, a bolt is inserted between the pair of wedge pieces after the pair of wedge pieces are arranged to face each other. When screwing, a bolt can be screwed by inserting a finger into the cutout groove.
In the eighth aspect of the present invention, the guide groove and the convex guide that can be engaged with each other are formed at one end of the joint portion of the pair of wedge pieces so as to be opposed to each other. The piece can be reliably and safely inserted into the engagement hole.
According to the ninth aspect of the present invention, since the taper angles of the upper, lower and side taper surfaces of the wedge pieces are the same or different, the contact surface pressure or adhesion force of the wedge pieces with respect to the engagement holes can be adjusted. it can.

In the invention of claim 10, since the taper angles of the upper surface, the lower surface, or both the left and right taper surfaces in the engagement hole are the same or different, the contact surface pressure or adhesion force in the vertical direction or the horizontal direction with respect to the wedge piece is increased. It can be adjusted.
In the invention of claim 11, since the taper angle of the upper and lower taper surfaces in the engagement hole is made larger than the taper angle of the left and right taper surfaces, the contact pressure of the left and right wedge pieces is engaged with the upper and lower surfaces. The contact pressure between the upper and lower surfaces in the hole can be increased, the holding force for the left and right surfaces can be increased, and the adhesion of the wedge pieces can be enhanced.

It is a perspective view which shows the table for meetings to which this invention is applied. It is a perspective view which expands and shows the principal part of this invention. It is sectional drawing in alignment with the AA of FIG. 2, and has expanded slightly. It is sectional drawing which follows the BB line of FIG. It is a perspective view which shows the halfway situation at the time of the assembly of this invention.

It is a perspective view which shows the halfway situation at the time of the assembly of this invention, and has shown the condition which inserted the joint of each joint into the edge part of two crossing lower frames, and joined a pair of wedge pieces. It is a front view which expands and shows the engagement hole formed in the edge part of the overhang | projection coupling of this invention. It is the fragmentary sectional view which follows the CC line of FIG. 7, and has expanded and shown in figure. It is the fragmentary sectional view which follows the DD line | wire of FIG. It is a perspective view which shows one coupling applied to this invention, and is a perspective view which shows the condition before inserting a joint in a lower frame.

It is sectional drawing which follows the EE line | wire of FIG. It is sectional drawing in alignment with the FF line | wire of FIG. 10, and has expanded slightly. It is a perspective view which shows the condition which inserted the joint of one joint applied to this invention in the lower frame.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a conference table will be described below. In FIGS. 1 to 13, 1 is a conference table, and a rectangular tube is formed on the outer side of the bottom surface of the horizontally long rectangular top plate 2. The lower frames 3 and 4 are attached so as to cross each other, and the upper end portion of the leg 5 is attached to the lower surface of the corner portion of the top plate 2.
The leg 5 is formed of a steel pipe having a rectangular cross section, and a rubber cap 6 is attached to the lower end portion thereof, and a connection joint 7 made of aluminum die casting is attached to the upper end portion thereof.
In the figure, 8 is a fixing plate attached to the inside of the upper end of the leg 5. A bolt 10 is inserted into the through hole 9, and its screw shaft is screwed into a screw hole 11 provided in the lower part of the connection joint 7. It is installed.

A prismatic overhang joint 12 is formed on the connection joint 7 so as to protrude laterally, and a rectangular pyramid-shaped engagement hole 13 is formed therein, and a pair of wedge pieces described later are pressed into the engagement hole 13. Inserted.
The engagement hole 13 is opened in a vertically long rectangle, its upper and lower parts are formed in a gentle mountain shape, its four corners are formed in a small curved surface shape, and a pair of wedge pieces 14 and 15 made of aluminum die casting inside thereof. Is press-fitted.
The inner surface of the engagement hole 13 is formed in a similar taper shape in which the upper and lower surfaces 13a and 13b are inclined toward the back, and the left and right surfaces 13c and 13d are formed in a taper shape that is inclined in the back.

  In the case of the embodiment, the taper angle θa by the upper and lower surfaces 13a and 13b is formed larger than the taper angle θb by the left and right surfaces 13c and 13d (θa> θb), θa is formed at about 18 °, and θb is about 6 °. Is formed. That is, the contact pressure between the left and right surfaces of the wedge pieces 14 and 15 and the left and right surfaces 13c and 13d is about 4 times the contact pressure between the upper and lower surfaces of the wedge pieces 14 and 15 and the upper and lower surfaces 13a and 13b. The strength of the wedge pieces 14 and 15 is enhanced by increasing the holding power to the left and right surfaces.

  In this case, the taper angle θa and the taper angle θb can be formed to be the same, or one of the taper angle θa and the taper angle θb can be set to 0 ° to form a flat surface. It is only necessary to obtain a strong wedge effect and to obtain a strong adhesive force by the upper and lower or left and right tapered surfaces formed in 15. Therefore, if the wedge effect is obtained in combination by the upper and lower and left and right tapered surfaces as in the embodiment, the adhesion force is doubled.

Side surfaces of the wedge pieces 14 and 15 are formed in an isosceles trapezoidal shape as shown in FIGS. 5, 8, and 10, and the upper and lower surfaces thereof can be engaged with the upper and lower surfaces 13 a and 13 b of the engagement holes 13. Formed on the surface.
The cross-sectional shape of the wedge pieces 14 and 15 is formed in a horizontally long trapezoidal shape as shown in FIG. 9, and the left and right side surfaces thereof are tapered surfaces that can be engaged with the left and right surfaces 13 c and 13 d of the engagement hole 13. Forming.

The joint portions 14a and 15a of the wedge pieces 14 and 15 are formed on smooth flat surfaces, and concave grooves 16 and 17 having a semicircular cross section are formed on one side of the joint surfaces 14a and 15a. Bolts 18 are inserted into the circular through holes joined together from the notch groove side described later. In the figure, 18a is a hexagonal hole-shaped engagement hole formed in the head of the bolt 18.
The bolt 18 is screwed into a screw hole 19 formed at the back of the overhanging joint 12 and tightened, and the wedge pieces 14 and 15 are fixed in close contact with the engagement hole 13.
The wedge pieces 14 and 15 are configured to be substantially the same, including a guide groove and a convex guide, which will be described later, so that the molding die can be shared and parts can be manufactured rationally, or maintenance can be rationalized. .

  In the figure, 20 is a spring washer disposed on the seating surface of the head of the bolt 18, and 21 and 22 are convex guides 22 having the same shape as a horizontally-long rectangular guide groove formed in parallel with one end of the joint surface 14 a of the wedge piece 14. Thus, a notch groove to be described later is formed between them. Also, a guide groove 21 and a convex guide 22 similar to those described above are formed at one end of the joint surface 15a of the other wedge piece 15, and another notch groove is formed therebetween.

When the wedge pieces 14 and 15 are joined and inserted into the engagement hole 13, the guide groove 21 and the convex guide 22 are fitted to each other so as to be inserted accurately and reliably.
Large and deep cutout grooves 23 and 24 are formed facing one end of the concave grooves 16 and 17, and fingers 18 can be inserted into the cutout grooves 23 and 24 to insert the bolts 18 into the through holes. After assembly, it is arranged to face the lower surface of the top plate 2.

The odd-shaped joints 25 and 26 are integrally formed at the base end portions of the wedge pieces 14 and 15, and projecting portions 27 and 28 that can be engaged with the end surface of the overhang joint 12 are projected at one end thereof. An engagement margin e is provided to enable engagement by the wedge pieces 14 and 15 and adjustment thereof.
At the front ends of the joints 25 and 26, prismatic joints 29 and 30 that can be inserted into the lower frames 3 and 4 project, and screw holes 31 and 32 are formed on the inner peripheral surfaces thereof. , 32 are screwed into the screws 33 and 34 through the through holes 35 and 36 of the lower frames 3 and 4.
In the figure, 37 and 38 are long holes formed in the length direction of the joints 29 and 30, and connecting bolts 39 and 40 are inserted into the long holes 37 and 38, and nuts 41 and 40 embedded in the top plate 2. 42, the joints 29 and 30 can be connected to the top plate 2.

  The connection structure of the top plate and the leg thus configured is such that the lower frames 3 and 4 attached to the lower surface of the top plate 2 and the joints 29 or 30 project from the lower frames 3 and 4 at one end and taper at the other end. Joints 25 and 26 projecting plate-like wedge pieces 14 or 15 and engagement holes 13 into which the wedge pieces 14 and 15 can be inserted are formed at one end, and can be connected to the upper end of the leg 5 at the other end. And a connection joint 7 provided with a shaft cylinder portion, and these need to be manufactured.

  Among these, the lower frames 3 and 4 are manufactured by cutting a steel pipe into a predetermined length and forming through holes 35 and 36 and long holes 37 and 38 on the peripheral surfaces of the ends. 30 and the wedge piece 14 or 15 are integrally formed by aluminum die casting, and the connecting joint 7 is formed by integrally molding the overhanging joint 12 having an engagement hole 13 at one end and the shaft cylinder portion at the other end by aluminum die casting. To make.

The opening of the engagement hole 13 is formed in a vertically long rectangle, its upper and lower parts are formed in a gentle mountain shape, its four corners are formed in a small curved surface, and a pair of wedge pieces 14 and 15 are in close contact with each other. To be able to accommodate.
The inner surface of the engagement hole 13 is formed into a similar taper shape in which the upper and lower surfaces 13a and 13b are inclined toward the back side, and the right and left surfaces 13c and 13d are formed into a similar taper shape that is inclined toward the back side.
In the case of the embodiment, the taper angle θa by the upper and lower surfaces 13a and 13b is formed larger than the taper angle θb by the left and right surfaces 13c and 13d (θa> θb), θa is formed at about 18 °, and θb is about 6 °. To form.

  Then, the contact pressure between the left and right surfaces of the wedge pieces 14 and 15 and the left and right surfaces 13c and 13d is approximately smaller than the contact pressure between the upper and lower surfaces of the wedge pieces 14 and 15 and the upper and lower surfaces 13a and 13b. It is increased by a factor of 4 to increase the holding force on the left and right sides, and the adhesion of the wedge pieces 14 and 15 is enhanced.

The wedge piece 14 or 15 is formed into a similar isosceles trapezoidal cross-sectional shape, and the structure is formed in the same manner except for the guide groove 21 and the convex guide 22 except for the guide groove 21 and the convex guide 22. Is formed into a similar tapered surface that can be engaged with the upper and lower surfaces 13a, 13b of the engagement hole 13.
Further, the outer left and right surfaces are formed into the same tapered surface that can be engaged with the left and right surfaces 13c and 13d of the engagement hole 13.
The joint portions 14a and 15a of the wedge pieces 14 and 15 are formed into a smooth flat surface, and concave grooves 16 and 17 having a semicircular cross section are formed on one side of the joint surface, and circular through holes are formed at the time of joining. The bolt 18 can be inserted into the through hole from the side of the notch grooves 23 and 24.

  As described above, the lower frames 3 and 4 may be simply processed by cutting the steel pipe into a predetermined length and forming the through holes 35 and 36 and the long holes 37 and 38 at the ends thereof, and the joints 25 and 26 are wedge pieces. 14 and 15 are formed by die-casting, and the connection joint 7 only needs to die-cast the engagement hole 13 and form the screw hole 19 at the back thereof, so that these can be manufactured easily and uniformly.

  Next, when the legs 5 are connected to the top plate 2 using the above-described constituent members, for example, a pair of lower frames 3 and 4 and joints 25 and 26 are prepared, and openings at the ends of the lower frames 3 and 4 are prepared. The joints 29 and 30 of the joints 25 and 26 are inserted into the lower frames 3 and 4, and screws 33 and 34 are screwed into the screw holes 31 and 32 of the joints 29 and 30 from the inner peripheral surfaces of the lower frames 3 and 4. , 30 are connected.

  Thereafter, a pair of lower frames 3 and 4 are arranged in parallel with each other on the lower surface of the top plate 2, and connecting bolts 39 and 40 are inserted into the long holes 37 and 38 opened at the lower surfaces of both ends of the lower frames 3 and 4. These are screwed into nuts 41 and 42 embedded in the top plate 2 and tightened to connect the joints 29 and 30 to the top plate 2. This situation is as shown in FIG.

On the other hand, before and after this, the shaft tube portion of the connection joint 7 is inserted into the upper end portion of the leg 5, the bolt 10 is inserted from the lower end portion of the leg 5, and the screw shaft is inserted into the through hole 9 of the fixing plate 8. This is screwed into the screw hole 11 of the connection joint 7 and tightened, and the upper end of the leg 5 is coupled to the connection joint 7.
At that time, a long nut wrench (not shown) is inserted from the lower end of the leg 5, engages with the head of the bolt 10, rotates, and the bolt 10 is inserted into the hole 9 and tightened. . Thereafter, the cap 6 is attached to the lower end of the leg 5. This situation is as shown in FIG.

In this way, the leg 5 with the cap 6 attached is moved to the side of the wedge pieces 14 and 15 integrated with the joints 25 and 26 attached to the lower surface of the top plate 2, and the wedge pieces 14 and 15 are inserted into the engagement holes 13 of the overhang joint 12. Insert. This situation is as shown in FIG.
At this time, the wedge pieces 14 and 15 are joined with the joint portions 14a and 15a being in close contact with each other, and the concave grooves 16 and 17 are arranged opposite to each other at the center of the joint portions 14a and 15a. A hole is formed, and each pair of convex guides 2 is engaged with the guide groove 21 to be integrally joined. This situation is as shown in FIGS.

Under such circumstances, when the wedge pieces 14 and 15 are inserted into the engagement hole 13 from the pointed end side and pushed into the inner part thereof, the upper and lower taper portions of the wedge pieces 14 and 15 become the upper and lower surfaces of the engagement hole 13. The left and right tapered portions of the wedge pieces 14 and 15 are engaged with the left and right surfaces 13 c and 13 d of the engagement hole 13.
Thereafter, fingers are inserted into the notched grooves 23 and 24 opened upward, the retained bolts 18 are inserted into the bolt insertion holes where the concave grooves 16 and 17 are joined, and the screw shafts at the tips thereof are inserted into the engagement holes 13. Screw into the screw hole 19 at the back and tighten.

For this reason, the tapered surfaces of the wedge pieces 14 and 15 engage with the upper and lower surfaces 13a and 13b and the left and right surfaces 13c and 13d of the engagement hole 13, and the contact pressure between them is pressed by the wedge effect. Adhere firmly.
In the embodiment, the contact pressure between the left and right surfaces of the wedge pieces 14 and 15 and the left and right surfaces 13c and 13d is approximately equal to the contact pressure between the upper and lower surfaces of the wedge pieces 14 and 15 and the upper and lower surfaces 13a and 13b. The contact force of the wedge pieces 14 and 15 is enhanced by increasing the holding force to the left and right surfaces by a factor of four.

  In this way, the top plate 2 is connected via the joints 25 and 26 and the joints 29 and 30 integral therewith, and the overhang joints are connected via the wedge pieces 14 and 15 integral with the joints 25 and 26. 12 to the legs 5 are connected.

  The conference table 1 assembled in this way is as shown in FIG. 1, with the legs 5 vertically attached immediately below the four corners of the top plate 2, and the connection joints 7 appearing at the upper ends of the legs 5. A part of the fitting 12 and the lower frames 3 and 4 are exposed directly below the top plate 2, and other connecting members are shielded from the top plate 2. Therefore, the assembled conference table 1 has a simple appearance.

In the conference table 1, the lower frames 3, 4 and the top plate 2 are connected via joints 29, 30 integral with the joints 25, 26, and the wedge pieces 14, 15 integral with the joints 25, 26 are connected. The overhang joint 12 or the leg 5 are connected to each other, the top plate 2 is connected through the joints 29 and 30, and the wedge pieces 14 and 15 are firmly connected to the engagement hole 13 of the overhang joint 12. Therefore, the leg 5 and the top plate 2 are firmly connected.
In addition, the wedge pieces 14 and 15 are pressed against the upper and lower surfaces 13a and 13b and the left and right surfaces 13c and 13d of the engagement hole 13 by the wedge effect to prevent the upper end of the leg 5 from shaking and rattling. 5 can be connected stably over a long period of time, and can withstand the use load of the top plate 2.

On the other hand, when shipping the components of the conference table 1 to the customer, the lower frames 3 and 4 are attached to the lower surface of the top plate 2 as shown in FIG. The joints 29 and 30 integrated with the H. 26 are inserted, and the pair of wedge pieces 14 and 15 are bonded to the outside.
The leg 5 is packed with the connecting joint 7 integrated with the overhang joint 12 at the upper end and the cap 6 attached at the lower end, and is packed together with the top plate 2 or separately.
Therefore, the customer can simply assemble by simply inserting the wedge pieces 14 and 15 into the engagement hole 13 and screwing and tightening the bolts 18 between them after opening the package.

  As described above, the connection structure between the top plate and the legs of the present invention can be manufactured easily and inexpensively with a simple configuration, and the top plate and the legs can be firmly connected, so that it is suitable for the use of the conference table.

2 Top plate 3, 4 Lower frame 5 Leg 13 Engagement holes 13a, 13b Tapered surfaces 13c, 13d Tapered surfaces

14, 15 Wedge pieces 14a, 15a Joints 17, 18 Concave groove 18 Bolt 21 Guide rod 22 Convex guides 23, 24 Notch groove

25, 26 Joint 29, 30 Joint

Claims (11)

In a top plate-to-leg connecting structure in which the upper end of the leg is arranged on the lower surface of the top plate, a tubular lower frame is attached to the lower surface of the top plate, and a joint and a plate-like wedge piece that can be inserted into the end of the lower frame And a wedge joint formed with a tapered surface on the upper surface, lower surface or upper and lower surfaces thereof, and an extended joint formed with an engagement hole into which a pair of wedge pieces can be inserted at the upper end of the leg. A tapered surface that can be engaged with the tapered surface of the wedge piece is formed on the upper surface, the lower surface, or the upper and lower surfaces in the engagement hole, and the tapered surfaces of the pair of wedge pieces are engaged with the tapered surface of the engagement hole. The bolt is inserted into the joint between the pair of wedge pieces so that the bolt can be inserted, the screw shaft of the bolt is screwed into a screw hole formed in the back of the engagement hole, and the pair of wedge pieces are engaged with the engagement. top plate and leg communicating fine granulation of which is characterized in that mounted for pressure contact with the Goana.   A taper surface is formed on one side peripheral surface of the pair of wedge pieces, a taper surface is formed on both right and left side surfaces in the engagement hole, and a taper surface of the side peripheral surface of the wedge piece is formed in the engagement hole. The top plate and leg connection structure according to claim 1, wherein the top plate and the leg are inserted so as to be able to engage with tapered surfaces on both the left and right side surfaces.   A taper surface is formed on the upper and lower surfaces and one side peripheral surface of the pair of wedge pieces, and taper surfaces are formed on the upper and lower and left and right side surfaces in the engagement hole, and the pair of wedge pieces are formed in the engagement hole. The top plate and leg connection structure according to claim 1, wherein the top plate and the leg are connected to each tapered surface in an engageable manner. Connection structure of the top plate and the legs of the joint is provided on one end portion of the joint, according to claim 1, wherein the wedge piece is provided on the other end.   Two lower frame ends are spaced apart from each other on the lower surface of the top plate, joint joints are inserted into the end portions of the respective lower frames, and joint portions of wedge pieces of each joint are joined and disposed. Item 1. A top plate and leg connection structure according to Item 1.   The top plate and leg connection structure according to claim 1, wherein a concave groove into which a bolt can be inserted is disposed opposite to a joint portion of the pair of wedge pieces.   The top plate and leg connection structure according to claim 1, wherein a notch groove into which a finger can be inserted is formed at one end of a joint portion of the pair of wedge pieces.   The top plate and leg connection structure according to claim 1, wherein a guide groove and a convex guide that can be engaged with each other are formed at one end of a joint portion of the pair of wedge pieces so as to face each other. The top plate and leg connection structure according to claim 2, wherein the taper angle of the upper, lower or side taper surfaces of the wedge pieces is the same or different. The top plate and leg connection structure according to claim 2 or 3, wherein the upper surface, the lower surface, or both right and left taper surfaces in the engagement hole have the same or different taper angles .   The top plate and leg connection structure according to claim 10, wherein the taper angle of the upper and lower taper surfaces in the engagement hole is larger than the taper angle of the left and right taper surfaces.

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