JPS6218729Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joining structure used, for example, to join a back plate and a back cushion material in a chair back.

Conventionally, for example, in the backrest of a chair, the backrest and back cushion material were screwed together from the rear of the backboard, so the screw heads were exposed on the surface of the backboard, which was unsightly and During regular use, the screws tended to have play, and the screws often came off. Furthermore, if the back cushion material is glued and joined to the back back plate, it will look beautiful, but it will take a long time to manufacture and it will easily come off.

The present invention has been developed in view of the above-mentioned circumstances, and its purpose is to prevent the screw heads from being exposed as in the past when joining the back cushion material to the back plate of a chair back, for example. It is possible to create a smooth appearance without any problems, and it is extremely easy to join regardless of the shape of the parts to be joined, and it is securely fixed without coming off like conventional screws. The purpose of the present invention is to provide a joint structure for a chair backrest, etc., that can maintain the

Hereinafter, the present invention will be explained by applying it to joining a back plate and a back cushion material in a chair back portion.

First, an embodiment shown in FIGS. 1 to 5 will be explained. In the present invention, one member, the back plate 1, and the other member, the back cushion material 2, are stacked on top of each other. The back plate 1 and the back cushion material 2 are joined to each other at the overlapping surfaces 3 and 4, and engaging protrusions 5 are protruded from the overlapping surface 3 of the back back plate 1 at appropriate locations. , this engagement protrusion 5
A tapered surface 12a that gradually narrows toward the distal end is formed on the outer surface of the distal end side of the shaft portion 11, and is perpendicular to the axial direction of the shaft portion 11 from the top of the tapered surface 12a to the shaft portion 11. An engaging surface 12b extending in the direction of the shaft portion 1 is formed.
1 is formed with a split groove 15 extending in the axial direction that narrows and makes it elastically deformable, and this engagement protrusion 5
An engagement hole 6 is provided in the overlapping surface 4 of the back cushion material 2 corresponding to the back back plate 1 and the back cushion material 2.
By overlapping the engaging protrusions 5 of the back plate 1
The shaft portion 11 is inserted into the engagement hole 6 of the back cushion material 2 using the groove 15, and the engagement surface 12b of the engagement protrusion 5 is inserted into the peripheral edge of the engagement hole 6 of the back cushion material 2. It is made by engaging with.

To explain this in detail, what is shown in FIGS. 1 to 5 is an example in which the back plate 1 constituting the chair back part is covered with a decorative cover 7, and the overlapping surface of the back plate 1 is covered with a decorative cover 7. 3 has an engaging protrusion 5 protrudingly provided thereon. That is, the back plate 1 has through holes 8 located at appropriate positions, for example, at the four corners, and having a predetermined opening diameter.
are drilled into each of these through holes 8, and an engaging protrusion forming member 9 shown in FIGS. 3 and 4 is inserted from the back side and its tip side is overlapped and protrudes toward the back cushion material 2 side. , to form the engaging protrusion 5. Each engagement protrusion forming member 9 is made of, for example, an integrally molded product made of nylon resin, has a dish-shaped head 10 having a larger diameter than the through hole 8, and is inserted into the through hole 8. Shaft part 11
The tip side of this shaft portion 11 projects from the overlapping of the back and back plates 1 toward the back cushion material 2 side, and the projecting tip side has a tapered surface 12a whose diameter gradually becomes smaller toward the tip side. A serrated engagement groove 13 is provided, in which engagement surfaces 12b extending in a direction perpendicular to the axial direction of the shaft 11 are formed alternately from the top of the surface 12a to the shaft 11, and the engagement groove 13 is A tapered guide surface 14 is formed at the tip, and a split groove 15 is cut into the shaft portion 11 from the tip toward the dish-shaped head 10, leaving a part of the shaft center portion. . Each engaging protrusion forming member 9 has a through hole 8 in the back plate 1 from its tip side.
from the back side so that the dish-shaped head 10 is locked to the back side of the back plate 1, and in this state, the engagement groove 13 and the guide surface 14 at the tip align the back plate 1 overlappingly. An engaging protrusion 5 is formed so as to protrude from the back cushion material 2 side. A decorative cover 7 is stretched over the entire back surface of the back plate 1 so as to cover the dish-shaped head 10 of the engagement protrusion forming member 9, and the peripheral edge 7a of the decorative cover 7 is formed on the overlapping surface 3. It has 16 locks. In addition, engagement holes 6 are provided at four locations in the overlapping surface 4 of the back cushion material 2, which is the other member, corresponding to the engaging protrusions 5 protruding from the overlapping surface 3 of the back plate 1. It will be done. That is, the substrate 19 of the back cushion material 2 is provided with through holes 17 located at the four corners corresponding to the engaging protrusions 5 and having a predetermined opening diameter.
7 shows the boss portion 2 of the engagement hole forming member 18 shown in FIG.
2 is fitted, and the flange portion 21 of this engagement hole forming member 18 is fixed to the overlapping surface 4 with a tack 20, thereby fixing the engagement hole forming member 18 to the back cushion material 2. The engagement hole 6 is formed passing through the boss portion 22, and the inner surface of the engagement hole 6 has a tapered guide having a large diameter on the overlapping surface 4 side and gradually becoming smaller on the opposite side. A receiving surface 23 is formed. Note that this engaging protrusion forming member 9 is an integrally molded product made of nylon resin. The back cushion material 2 also has a substrate 19 forming the overlapping surface 4.
A cushion 24, such as a sponge, is placed on the back of the
The surface of the cushion 24 is covered with a decorative cover 7' which is tacked 25. Furthermore, the inner diameter of the engagement hole 6 is the maximum outer diameter of the tapered surface 12a of the engagement protrusion 5 and the engagement surface 12b.
The engagement protrusion 5 can be press-fitted into the engagement hole 6, but as shown in FIG. The structure is such that once it is engaged with the minimum diameter portion 23a of the surface 23, it will not come out of the engagement hole 6.

With such a configuration, the engaging protrusion 5
By overlapping the overlapping surface 4 of the back cushion material 2 provided with the engaging hole 6 with the overlapping surface 3 of the back plate 1 provided with the engaging hole 6, the engaging protrusion 5 can be press-fitted into the engaging hole 6. can. At that time, the engaging protrusion 5
The leading end guide surface 14 of the engaging hole forming member 18 is pushed along the tapered guide receiving surface 23 of the engaging hole forming member 18, and the engaging groove portion 13 of the engaging projection 5 is elastically deformed in the diametrical direction to form the engaging hole 6. The engagement surface 12b of the engagement protrusion 5 can be easily press-fitted into the engagement hole 6 as shown in FIG. It will never come out. By fitting and engaging each engaging protrusion 5 into each engaging hole 6 in this manner, the overlapping surface 3 of the back plate 1 and the overlapping surface 4 of the back cushion material 2 can be easily joined. can. Further, the dish-shaped head 10 of the engagement protrusion forming member 9 is covered with the decorative cover 7, so that it is not exposed visually.

Next, another embodiment of the literary device will be explained with reference to FIGS. 6 and 7.

In this embodiment, a back plate 1 constituting a chair back portion is shown.
This is an example in which the overlapping surface 3 of the back plate 1 is not covered with a decorative cover, and fixing grooves 26 extending toward the center as shown in FIG. Each of these fixing grooves 26 has a circular groove 27 on the outside into which the dish-shaped head 10 of the engagement protrusion forming member 9 can be freely inserted and removed, and a portion communicating and extending from the circular groove 27 inward. The plate-shaped head 10 of the engagement protrusion engaging member 9 is movable in the groove direction, and has a rectangular shape with protruding locking edges 30, 30 for locking the plate-shaped head 10 so that it does not come off. It is provided with a groove portion 28. The dish-shaped head 10 of the engagement protrusion forming member 9 is inserted into the circular groove 27 of the fixing groove 26, and then the dish-shaped head 10 is inserted into the circular groove 27 of the fixing groove 26.
is moved from the circular groove part 27 to the terminal end 28a of the square groove part 28, the dish-shaped head 10 is moved to the locking edges 30, 3.
0 and the overlapping surface 3 is locked without coming off.
The engaging protrusion 5 is formed protrudingly on the surface. The overlapping surface 3 of the back plate 1 provided with the engagement protrusion 5 in this way
For example, the back cushion material 2 shown in FIG.
The overlapping surfaces 4 of the two are overlapped as in the above-mentioned embodiment, and the two are joined as shown in FIG.
Therefore, the engaging protrusion forming member 9 is not exposed at all.

In each of the above embodiments, the engagement protrusion 5 is provided protrudingly on the overlapping surface 3 of the back plate 1, and the engagement hole 6 is provided in the back cushion material 2. However, the present invention is not limited to this. The back plate 1 may be provided with an engagement hole 6, and the back cushion material 2 may be provided with an engagement protrusion 5.

Furthermore, in each of the above embodiments, the present invention is applied to a chair backrest, but the present invention is not limited to this, and may also be applied to, for example, joining a front cushion material and a seat back plate member of a chair seating portion. Furthermore, the present invention may be applied to various joining structures in which one member and the other member are joined at their overlapping surfaces.

In FIGS. 6 and 7, parts corresponding to those in FIGS. 1 to 5 are designated by the same reference numerals.

As explained above, the present device is a device for joining two members together at the overlapping surface by overlapping one member with the other member, and an engagement protrusion is provided in an appropriate arrangement on the overlapping surface of one of the members, and a tapered surface that gradually narrows toward the tip is provided on the outer surface of the tip side of the shaft of the engagement protrusion, and an engagement surface is formed that extends in a direction perpendicular to the axial direction of the shaft from the top of the tapered surface to the shaft, and a split groove is formed in the shaft to narrow the shaft and allow it to be elastically deformed, and this engagement By providing an engagement hole on the mating surface of the other member corresponding to the protrusion, and by overlapping the two members, the shaft of the engagement protrusion of one member is fitted into the engagement hole of the other member using the split groove, and the engagement surface of the engagement protrusion is engaged with the peripheral portion of the engagement hole of the other member, so that the two members can be joined by simply pushing the engagement protrusion of one member into the engagement hole of the other member, and since the engagement protrusion or engagement hole is provided on the mating surface of each member, the engagement protrusion does not need to be exposed at all from the outside, and can be made neat. In addition, since the engagement protrusion or engagement hole can be provided at an appropriate position on the mating surface of each member, it is extremely easy to join members of any shape without having to choose the shape of the members to be joined. Furthermore, there is no risk of the screws coming loose and the joint between the members coming apart, as in the case of conventional screw fastening, and a secure fixed state (joined state) can be obtained for a long time.

[Brief explanation of the drawing]

Figures 1 to 5 show one embodiment of the present invention, Figure 1 is a perspective view showing the state before the back cushion material is bonded to the back plate, and Figure 2 is an enlarged view of the bonded state. 3 is a side sectional view, FIG. 3 is a perspective view showing the engaging protrusion forming member used in the present invention, and FIG. 4 is FIG.
5 is a perspective view showing the engagement hole forming member used in the present invention, FIGS. 6 and 7 show other embodiments of the back plate, and FIG. 6 is a perspective view. ,
FIG. 7 is a side sectional view corresponding to FIG. 2, showing an enlarged view of the bonded state. DESCRIPTION OF SYMBOLS 1... Back back board (one member), 2... Back cushion material (other member), 3... Overlap surface of back back board, 4... Overlap surface of back cushion member, 5...
...Engagement protrusion, 6...Engagement hole, 11...Shaft portion, 12
a... Tapered surface, 12b... Engagement surface, 15... Division groove.

Claims (1)

[Scope of utility model registration request] In a joint structure such as a chair back portion in which one member and the other member are overlapped with each other and the two members are joined to each other on the overlapping surface, an engaging protrusion is appropriately provided on the overlapping surface of the one member. The engaging protrusion has a tapered surface that gradually narrows toward the distal end on the outer surface of the distal end of the shaft, and the axis of the shaft extends from the top of the tapered surface to the shaft. An engaging surface extending in a direction perpendicular to the direction is formed, and a split groove extending in the axial direction that narrows the engaging surface and makes it elastically deformable is formed in the shaft portion, and the other member is overlapped corresponding to this engaging protrusion. An engagement hole is provided in the mating surface, and by overlapping one member and the other member, the shaft of the engagement protrusion of one member can be inserted into the engagement hole of the other member using the split groove. A joining structure for a chair back or the like, characterized in that the engaging surface of the engaging protrusion is engaged with the peripheral edge of the engaging hole of the other member.