JP7324636B2 - Strut connection structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a post connection structure used for a single-post type table and the like, and more particularly to a post connection structure for fixing members such as a base of a table and a top board support to a post with bolts.

The leg structure of a single-post type table is such that the base of the table and the top plate (top plate support) of the table are connected via a single pipe-shaped post. Prior art related to the structure of the connection is shown below.

Japanese Utility Model Laid-Open No. 54-156059 A connector that can easily and firmly fix a pipe material to another member without welding. 4) consists of a tightening bolt (6) which is screwed together. The diameter of the fixture (3) is molded somewhat larger than the inner diameter of the pipe. With the tightening bolt (6) screwed into the screw hole (4), the fixture (3) is press-fitted into the pipe (2) and fixed. This is a wedge device for joining a plate material to the end of a pipe material in a T-shape, and includes two plate-like legs inserted into the hollow interior of the pipe material, and a wedge in the hollow interior of the pipe material. It has a strut member that presses both legs against the inner wall surface of the pipe material. Japanese Utility Model Publication No. 56-032103 A boss member forming a threaded hole fitted in the center of the leg, and a threaded portion on the upper and lower long and short portions that stand vertically by screwing the lower end into the threaded hole. a cylindrical post that has a table receiver at its upper end and that fits the entire outer peripheral side of the mandrel; . At the time of assembly, the mandrel is screwed into the center of the leg and set up, the cylindrical support is fitted on the outer circumference of the mandrel, the upper end of the mandrel is fixed with a nut to prevent the support from coming off from the mandrel, and then the table is assembled. fixed. Japanese Utility Model Publication No. 57-059698 Positioning projections 11 and 12 are provided at positions where the leg members 2 are attached to the support member 3 . The positioning projections 11 and 12 are positioned by fitting the inner surface of the lower end opening 3a of the support member 3. As shown in FIG. By inserting the fixed body 20 into the inside of the pipe 1 and pressing it in the longitudinal direction of the pipe 1 with the press machine 5, the outer edge of the flange portion 23 bites into the end surface 1a of the pipe 1, thereby A portion of the inner edge of the end face 1a of the is plastically deformed along the inclined surface 23b toward the neck portion 22, and the portion 2 plastically deformed toward the neck portion 22 is moved along the lower surface 23b of the flange 23 to the neck portion 22. reaches a position where it almost touches the thinnest upper end 22a. Due to the strong friction between the outer periphery 23c of the flange portion 23 and the biting portion of the end face 1a of the pipe 1 in contact therewith, and the friction between the lower surface 23b of the flange portion 23 and the plastically deformed portion 2, the rotation of the fixed body 20 with respect to the pipe 1 is sufficiently strong. regulated by

From an economical point of view, the leg structure of the table should preferably be easy to manufacture, and its manufacturing quality should be high.

The connection structure described in Patent Literature 1 is excellent in that it can be easily assembled, but the fixture (3) is only stopped by friction within the pipe (2). Fixation is uncertain and may not be able to withstand large loads, for example, when screws are tightened strongly. In addition, it is impossible to prevent deviation in the rotational direction.

In the connection structure described in Patent Document 2, the legs are pressed against the inner wall surface of the pipe by pushing the legs in the hollow inside of the pipe, and are stopped only by friction. Fixation is uncertain and may not be able to withstand large loads, for example, when screws are tightened strongly. In addition, it is impossible to prevent deviation in the rotational direction.

In the connection structure described in Patent Document 3, although the connection is reliable because the core rod is screwed, there is no mechanism to stop the rotation around the core rod, and the table surface plate rotates with respect to the legs. There is a risk of If the table top plate is circular as in Patent Document 3, there is no problem even if it rotates, but it cannot be applied to a leg structure that uses a square or rectangular table top plate.

In the connection structure described in Patent Document 4, the positioning projection is positioned by fitting the inner surface of the lower end opening of the support member. It can be applied if the cross section of the strut member is square or rectangular, but it cannot be applied to a pipe with a circular cross section.

The connection structure described in Patent Document 5 requires press work, which complicates the process. In addition, the fixed body must be machined with high precision while maintaining the strength to withstand the press, which poses a problem in terms of cost. be.

A table is manufactured by attaching a base to one end of a pipe-shaped support and attaching a top plate (top plate holder) of the table to the other end. When installing, the members are bolted together, but for that purpose it is necessary to provide an internal thread in the column. Traditionally, this was attached by welding. Therefore, there is a problem that the manufacturing man-hours increase.

In the case of square or rectangular tops, if the positional relationship between the support and the top is out of alignment (the top is rotated with respect to the support), there will be gaps when the tables are placed side by side, or they will interfere with each other. may occur. In order to avoid this, it is necessary to minimize the angular deviation that occurs between the base and the top plate after the struts are attached to the base and the top plate is attached.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is a table leg that can simplify the assembling method, reduce the number of assembling man-hours, and improve the quality of assembly by minimizing angular misalignment. An object is to provide a structure and a manufacturing method thereof.

The present invention is a post connection structure for fixing a member such as a table base 1 or a top plate support 3 to a post with bolts,
Plate-like member fixing bodies 6a and 6b having bolt screw holes 61 for fixing the members such as the base of the table and the top plate receiver;
a bar-shaped or pipe-shaped first strut member 21 formed by bending a plate-shaped member having the member fixing body attached near the end thereof;
A pipe-shaped second strut member 22 in which the first strut member is inserted,
The first strut member and the second strut member constitute the strut and have substantially the same length,
Openings 21q and 21r having a shape corresponding to the cross section of the member fixing body are provided in the vicinity of the ends of the first support member. The member is inserted into the member, and the bolt screwing hole of the member fixing body appears on the end surface of the second strut member,
A front end A and a rear end B of the member fixing body in the fitting direction are processed to be in contact with the inner surface of the second strut member in a state in which the first strut member is inserted into the second strut member. It is characterized by

Positioning protrusions 21a and 21b may be provided at the ends of the first support members.

ADVANTAGE OF THE INVENTION According to this invention, the hole for bolt screwing for assembling a member can be provided without welding, and a manufacturing man-hour can be reduced.
In addition, since the protrusions can be used for accurate positioning, errors in the orientation of the top plate can be suppressed, and assembly accuracy is improved.

1 is an overall perspective view of a table to which a support column connection structure according to an embodiment of the invention is applied (only top plate receivers are shown; the top plate is omitted; the same applies hereinafter); FIG. 1 is an exploded perspective view of a table to which a pillar connection structure according to an embodiment of the invention is applied; FIG. FIG. 3 is an exploded perspective view showing a state in which the inner support pipe is pulled upward to the extent that the thick sheet metal attached to the end portion thereof is exposed in FIG. 2 ; 4 is an upper enlarged view of the inner support pipe in FIG. 3 (showing a state in which the thick sheet metal is pulled out from the opening of the inner support pipe); FIG. FIG. 2 is an enlarged view of a top plate receiving portion of FIG. 1; FIG. 6(a) is a diagram of FIG. 5 with the top plate support removed. FIG.6(b) is a top view of the support|pillar connection structure which concerns on embodiment of invention (bolt is excluded). FIG. 10 is an explanatory diagram (enlarged portion) of the connection between the cross base of the table to which the column connection structure according to the embodiment of the invention is applied and the lower portion of the column; FIG. 8(a) is an overall perspective view of the outer strut pipe. FIG. 8(b) is an overall perspective view of the inner support pipe. FIG. 8(c) is an enlarged front view of the upper portion of the inner support pipe. FIG. 8(d) is an enlarged upper rear view of the inner support pipe.

Embodiments of the invention will be described with reference to the drawings.

FIG. 1 is an overall perspective view of a table to which a support column connection structure according to an embodiment of the invention is applied (only the top plate holder is shown; the top plate is omitted; the same applies hereinafter). FIG. 5 is an enlarged view of the top plate receiving portion of FIG. FIG. 6(a) is a diagram of FIG. 5 with the top plate support removed. FIG.6(b) is a top view of the support|pillar connection structure which concerns on embodiment of invention (bolt is excluded).

FIG. 2 is an exploded perspective view of a table to which the column connection structure according to the embodiment of the invention is applied. FIG. 3 is an exploded perspective view showing a state in which the inner support pipe 21 in FIG. 2 is pulled upward to the extent that the thick sheet metal attached to the end thereof is exposed.

The present table comprises a cross base 1 consisting of four radially arranged legs, a support 2 vertically attached to the center of the base 1, and a top board receiver 3 attached to the upper end of the support 2. - 特許庁As shown in the figure, the top plate receiver 3 is attached to the column 2 from above with bolts 41 and spring washers 42 . Although not shown, a top plate having a predetermined shape (square, rectangle, circle, etc.) is attached to the top plate receiver 3 . The strut 2 includes a rod-shaped or pipe-shaped inner strut pipe (first strut member) 21 formed by bending a sheet metal (plate-shaped member), and a pipe-shaped outer strut pipe (second strut member) into which the inner strut pipe 21 is inserted. member) 22. The inner strut pipe 21 is approximately the same length as the outer strut pipe 22 . A bolt hole 3a is provided in the center of the top plate support 3, and two holes 3b for receiving the positioning/rotation stopping protrusions 21a are provided symmetrically around this. The distance between the holes 3b, 3b corresponds to the width of the inner support pipe 21. As shown in FIG. The holes provided at the four corners of the top plate receiver 3 are screw holes for mounting the top plate. The cross base 1 is attached to the column 2 from below with bolts 51 and spring washers 52 .

FIG. 4 is an enlarged top view of the inner support pipe 21 in FIG. 4 shows a state in which the thick sheet metal 6a is pulled out from the slot holes (openings) 21q, 21r of the inner support pipe 21. FIG. Although not shown, the lower part of the column also has the same structure as in FIG.

A screw hole 61 for a bolt is provided substantially in the center of the thick sheet metal 6a. The slot holes 21q and 21r are openings having a shape (rectangular) corresponding to the cross section of the thick sheet metal 6a. The thick sheet metal 6a is inserted in the direction of the arrow in FIG. The rear end of the thick sheet metal 6a in the insertion direction is wider than the slot holes 21q and 21r, and this portion (locking portion 62) abuts the surface of the inner support pipe 21 to hold the thick sheet metal 6a at a predetermined insertion position. Stopping.

When the inner strut pipe 21 is inserted into the outer strut pipe 22 in this state, the screw holes 61 of the thick sheet metal 6a appear on the end face of the outer strut pipe 22 as shown in FIG. It can be fixed to the inner strut pipe 21 . Since the inner support pipe 21 and the outer support pipe 22 are not welded, the top plate receiver 3 is not directly fixed to the outer support pipe 22, but the outer support pipe 22 is attached to the top plate support 3 and the weight of the top plate (not shown). It is also possible to receive all or part of the stiffness (vertical force) (eg, make the outer strut pipe 22 the same length or slightly longer than the inner strut pipe 21). Alternatively, the inner strut pipe 21 may take all the weight. As shown in FIG. 6(b), the front end A and the rear end B of the thick sheet metal 6a in the inserting direction are in contact with the inner surface of the outer strut pipe 22. As shown in FIG. In the example shown in the figure, the front end A and the rear end B are arc-shaped corresponding to the shape of the inner surface of the outer strut pipe 22 . Since the shape of the thick sheet metal 6a is processed in such a way, the thick sheet metal 6a does not rattle in the outer support pipe 22, and the screw holes 61 are kept in place (at the center of the outer support pipe 22). be done.

By inserting the bolt 41 into the bolt hole (through hole) 3a of the top plate receiver 3 and screwing it into the screw hole 61 of the thick sheet metal 6a, the top plate receiver 3 is fixed to the column. Two protrusions 21a provided at the upper end of the inner support pipe 21 are fitted into the two holes 3b of the top plate receiver 3. As shown in FIG. As a result, the top plate receiver 3 is firmly fixed to the inner support pipe 21 and does not rotate. Note that the hole 3b is not required to be a through hole as long as the protrusion 21a is fitted therein. It may be a concave portion. A projection 21a of the inner support pipe 21 protrudes from its end. The cross section of the inner support pipe 21 is substantially square-shaped, and projections 21a are provided on two opposite sides thereof.

Details of the connection between the cross base 1 and the strut 2 will be explained with reference to FIG. FIG. 7 is an explanatory view (enlarged portion) of the connection between the cross base 1 and the lower part of the support 2 of the table to which the support connection structure according to the embodiment of the invention is applied.

The strut mounting portion 11 has a shape such that a short cylinder protrudes from a flat surface. The cylindrical portion fits inside the outer strut pipe 22 . A threaded hole (through hole) 11a for a bolt 51 is provided in the center of the column attachment portion 11, and two protrusions 21b provided at the lower end of the inner column pipe 21 are fitted into two opposite locations on the circumference. A notch (recess) 11b is provided. A plurality of (for example, 12) small projections 11c are provided on the outer periphery of the cylindrical portion of the post attachment portion 11 . The small protrusion 11c contacts the inner surface of the outer strut pipe 22 and functions to hold it. The inner support pipe 21 is slightly shorter than the outer support pipe 22 corresponding to the height of the projecting portion (cylinder) of the support mounting portion 11 (the projection 21b is slightly recessed at the lower end of the support 2). Two protrusions 21b provided at the lower end of the inner support pipe 21 are fitted into the two notches 11b. As a result, the inner support pipe 21 is positioned and does not rotate.

The structure of the lower end of the column 2 is the same as that of the upper end, and a thick sheet metal 6b is attached near the lower end of the inner column pipe 21 . The protrusion 21b at the lower end is similar to the protrusion 21a at the upper end. As shown in FIG. 7, the screw holes 61 in the thick metal plate 6b appear at the end faces of the outer support pipes 22, so that the cross base 1 can be fixed to the inner support pipes 21 with bolts 51 (the outer support pipes 22 are positioned vertically). (similar to the case of the upper end of the strut 2). The point that the front end and the rear end of the thick plate metal 6b in the insertion direction are in contact with the inner surface of the outer support pipe 22 is also the same. Since the shape of the thick sheet metal 6b is so machined, the thick sheet metal 6b does not rattle within the outer strut pipe 22 and the screw holes 61 are kept in place.

FIG. 8(a) is an overall perspective view of the outer strut pipe. FIG. 8(b) is an overall perspective view of the inner support pipe. FIG. 8(c) is an enlarged front view of the upper portion of the inner support pipe. FIG. 8(d) is an enlarged upper rear view of the inner support pipe.

As can be seen from FIGS. 8(a) and 8(b), the lengths of the inner support pipe 21 and the outer support pipe 22 are substantially the same. Thick sheet metals 6a and 6b are attached near the ends of the inner support pipe 21, respectively. The mounting distance of the thick sheet metals 6a and 6b from the ends is determined according to the length of the bolts 41 and 51. As shown in FIG. The outer strut pipes 22 are, for example, steel pipes and can withstand vertical compressive forces.

As can be seen from FIGS. 8(c) and (d), slot holes 21q and 21r are provided at the same position (height) of the inner support pipe 21. As shown in FIG. Its size is almost the same as the cross section of the thick metal plates 6a and 6b, so that the thick metal plates 6a and 6b can be inserted without backlash.

Although the leg structure of the table in FIG. 1 used a cross base as the base, it is also possible to use a square base instead. When using the square base, its connection structure is the same as that of the upper top plate support 3 . A bolt hole (screw hole) is provided approximately in the center of the square base, and two holes are provided symmetrically around this. Two protrusions 21b provided at the lower end of the inner support pipe 21 are fitted into the two holes. As a result, the square base 5 is firmly fixed to the inner support pipe 21 and does not rotate.

In the embodiment of the invention, screw holes for bolts for attaching the cross base 1 and the top plate receiver 3 are formed by inserting the thick plate metal plates 6a and 6b into the ends of the inner support pipe 21, which are then attached to the outer support pipe 22. It can be provided on the strut 2 by inserting it into. Its size is almost the same as the cross section of , so that the thick sheet metals 6a and 6b can be inserted without backlash. Therefore, it is not necessary to fix the thick sheet metal by welding. Man-hours can be reduced by eliminating the need for welding.

According to the embodiment of the invention, the internal thread for assembling the member can be provided without welding, and the manufacturing man-hour can be reduced.

In addition, since the projections 21a and 21b allow accurate positioning, errors in the orientation of the top plate can be suppressed, and assembly accuracy is improved.

This strut connection structure can be applied to other than the struts of the table. For example, it can be applied to posts and beams of conference desks. The inner support pipe 21 (first support member) is a pipe-shaped member, but the inner support pipe 21 may be a rod-shaped member made by bending a sheet metal. A pipe is a pipe, and when looking at the cross section, it is generally covered with a plate-like member over the entire circumference, but a pipe that is partially open can also be included. can. Although the thick plate metal (member fixing bodies) 6a and 6b has one screw hole, a plurality (for example, three) may be provided. By increasing the number of screw holes, the strength of the connection can be increased and heavier members can be connected and held. As well as increasing the fastening force, it can also be used in structural systems that use large columns. A thick sheet metal (member fixing body) may be provided only at one end of the inner support pipe 21 . However, in this case, in order to fix the outer support pipe 22, it is desirable to fix it to the inner support pipe 21 by welding or the like. The numbers and positions of the protrusions 21a and 21b are examples. For example, the number of protrusions may be one, or four protrusions may be provided on each side of the rectangle in plan view. The position may also be offset from the center of each side, or may be provided at a corner (apex of a rectangle).

The present invention is not limited to the above embodiments, and various modifications are possible within the scope of the invention described in the claims, which are also included in the scope of the present invention. It goes without saying that

1 Cross base (base of leg)
11 Strut holder 11a Bolt through hole (mounting hole)
11b Notch/recess for receiving projection 21b for positioning/rotation prevention 11c Small projection contacting and holding the inner surface of outer support pipe 22 2 Support 21 Inner support pipe (first support member)
21a Positioning/rotation-preventing protrusion 21b for top plate support 3 Positioning/rotation-preventing protrusion 21q for post support 11 Slot holes (openings) for receiving thick metal plates 6a and 6b
21r Slot holes (openings) for receiving the thick sheet metals 6a and 6b
22 Outer strut pipe (second strut member)
3 Top plate receiver 3a Hole for through bolt (through hole)
3b Hole (recess) for receiving projection 21a for positioning/rotation stop
41 bolt 42 spring washer 51 bolt 52 spring washer 6a, 6b thick sheet metal (member fixing body)
61 Screw holes for bolts (holes for screwing bolts)
62 Locking portion A Front end B of thick sheet metal (member fixing body) Rear end of thick sheet metal (member fixing body)

Claims (2)

A post connection structure for fixing a member that is a base of a table or a top plate support to a post with bolts,
a plate-like member fixing body having holes for screwing bolts for fixing the members such as the base of the table and the top plate support;
a rod-shaped or pipe-shaped first strut member configured by bending a plate-shaped member having the member fixing body attached near the end thereof;
A pipe-shaped second strut member into which the first strut member is inserted,
The first strut member and the second strut member constitute the strut and have substantially the same length,
An opening having a shape corresponding to the cross section of the member fixing body is provided in the vicinity of the end of the first support member, and the first support member having the member fixing body fitted in the opening is inserted into the second support member. a bolt screwing hole of the member fixing body appears on the end surface of the second strut member,
A front end and a rear end of the member fixing body in the fitting direction are processed into a shape that contacts the inner surface of the second support member in a state in which the first support member is inserted into the second support member. A strut connection structure. 2. The strut connection structure according to claim 1, wherein a projection for positioning is provided at an end of said first strut member.

Images