JPH0422090Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a joining structure used for joining a back back plate and a back cushion material in, for example, a chair back.

(Prior Art) As a joint structure for the backrest of a chair, for example, US Pat. An engaging hole is provided in each overlapping surface of the supporting frame (the other member) corresponding to the supporting frame, and by overlapping the back cushion material on the supporting frame, each of the engaging protrusions is fitted into the engaging hole, A device is disclosed in which each engagement protrusion is engaged and fixed to each engagement hole.

(Problem to be solved by the invention) In such a joining structure, when attaching multiple engagement protrusions to the overlapping surfaces of the back cushion material or when providing multiple engagement holes on the support frame, it is difficult to determine the attachment position. Errors will inevitably occur, and the back cushion material may be slightly deformed (warped, etc.) after each engagement protrusion is attached, so please be sure that each engagement protrusion actually matches each engagement hole accurately. is rare. Therefore, when stacking the back cushion material on the support frame, it is difficult for all of the engagement protrusions to engage with each engagement hole, making the joining process difficult.
Furthermore, even if the respective engaging protrusions were forced to engage with the respective engaging holes, there were problems such as the engaging protrusions becoming bent or broken during use of the chair.

The present invention was developed in view of these circumstances, and even if there is a slight installation error or the member is slightly deformed, each engaging protrusion can be easily engaged with each engaging hole. It is an object of the present invention to provide a joint structure for a chair backrest, etc., which can prevent damage or damage to an engaging protrusion.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a plurality of engagement protrusions protruding from the overlapping surface of one member and each engaging projection provided on the overlapping surface of the other member. In a joint structure such as a chair back part that joins one member and the other member to each other by engaging with a hole, the engaging protrusion includes a shaft portion and an outer surface on the distal end side of the shaft portion extending toward the rear end side. an engagement surface extending in a direction perpendicular to the axial direction of the shaft from the top of the tapered surface to the shaft; and an engagement surface extending outward from the top of the tapered surface toward the rear end of the shaft. A locking head is provided, and the one member is provided with a plurality of holes larger than the shaft and smaller than the locking head, and the shaft of the engagement protrusion is inserted into each hole and engaged. The engaging head of the mating protrusion is brought into contact with the surface opposite to the overlapping surface of one member, and the engaging hole is formed with a sufficient depth on the circumferential surface in the direction in which the engaging protrusion is inserted. The circumferential surface of the engagement hole is formed into a tapered guide receiving surface into which the shaft of the engagement protrusion is guided and inserted, and the tip of the shaft of the engagement protrusion is guided by the tapered guide receiving surface. The engagement surface of the locking protrusion is adapted to engage with the peripheral edge of the engagement hole of the other member.

(Function) According to such a configuration, even if the position of each engaging protrusion provided on the overlapping surface of one member is slightly shifted due to installation error, each engaging projection provided on the overlapping surface of the other member Even if the positions of the mating holes are slightly shifted, and even if the member is slightly deformed, when each engaging protrusion is inserted into each engaging hole, the tip of the shaft of each engaging protrusion will be aligned with each engaging hole. While being guided by the tapered guide receiving surface, the locking head of each engagement protrusion moves following the guide of the shaft part, and each engagement protrusion is accurately oriented to each engagement hole, and each engagement protrusion is The engagement surface of the engagement protrusion can be easily and appropriately engaged with the peripheral edge of each engagement hole.

When the engagement surface of each engagement protrusion is engaged with the peripheral edge of each engagement hole, one member is held between this engagement and the locking head of each engagement protrusion. One member and the other member are joined.

In addition, even if a large external shearing force is applied to the engaging protrusions during use of the chair back, etc., each engaging protrusion is properly engaged with the peripheral edge of each engaging hole, so each engaging protrusion The protrusions rarely bend or break.

(Example) Hereinafter, an example applied to joining a back plate and a back cushion material in a chair back portion will be described.

First, to explain an embodiment shown in FIGS. 1 to 5, one member constituting the chair back, that is, the back plate 1 has a decorative cover 3' on the opposite side of the overlapping surface 3. 7, and an engaging protrusion 5 is provided on the overlapping surface 3 of the back plate 1.

The engagement protrusion 5 is an integrally molded product made of nylon resin, and has a tapered guide surface 14 formed at the tip of the shaft portion 11, and a taper that gradually widens toward the rear end on the outer surface of the tip side of the shaft portion 11. The shaft portion 11 extends from the surface 12a and the top of the tapered surface 12a to the shaft portion 11.
An engagement surface 12b extending in a direction perpendicular to the axial direction of
are alternately formed in a sawtooth shape. A saucer-shaped locking head 10 is formed on the rear end side of the shaft portion 11 and extends outward from the top of the tapered surface 12a.
Further, a split groove 15 is formed from the tip of the shaft portion 11 toward the locking head 10, leaving a portion 9 of the shaft center portion.

Through holes 8 having a diameter larger than the shaft portion 11 of the locking protrusion 5 and smaller in diameter than the locking head 10 are bored in the four corners of the back plate 1. Insert the shaft portion 11 of each engagement protrusion 5 from the surface 3' of the back plate 1, and bring the locking head 10 of the engagement protrusion 5 into contact with the surface 3', so that the tip side of each engagement protrusion 5 By protruding from the overlapping surface 3, each engaging protrusion 5 protrudes toward the other member constituting the chair back, that is, the back cushion material 2 side. The decorative cover 7 covers the surface 3' of the back plate 1 after the engagement protrusion 5 is installed, and the peripheral edge 7a of the decorative cover 7 is tacked 16 to the overlapping surface 3.

The overlapping surface 4 of the back cushion material 2, which is the other member, is provided with engaging holes 6 at four locations corresponding to the engaging protrusions 5 protruding from the overlapping surface 3 of the back plate 1. There is. 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. The boss portion 22 shown in the figure is inserted into this engagement hole forming member 18.
The engagement hole forming member 18 is fixed to the back cushion material 2 by fixing the flange portion 21 of the engagement hole forming member 18 on the overlapping surface 4 with a tack 20. The depth of the engagement hole 6 in the direction in which the engagement protrusion 5 is inserted is ensured to be sufficiently deep by the inner peripheral surface of the boss portion 22, and the circumferential surface of the engagement hole 6 is overlapped. Tapered guide tray 23 that has a large diameter on the mating surface 4 side and gradually becomes smaller on the opposite side.
The tip of the tapered guide receiving surface 23 serves as an engagement peripheral edge, and is adapted to engage with any of the engagement surfaces 12b of the engagement projections 5. In addition, the back cushion material 2 has an overlapping surface 4.
A cushion 24 made of, for example, sponge is glued to the back surface of the substrate 19 forming the substrate 19, and the surface of the cushion 24 is covered with a decorative cover 7' secured with a tacker 25. Further, the minimum inner diameter of the engagement hole 6 is set to an intermediate dimension between the maximum outer diameter of the tapered surface 12a of the engagement projection 5 and the bottom outer diameter of the engagement surface 12b. However, as shown in FIG. 2, once the engagement surface 12b engages with the engagement periphery of the tapered guide receiving surface 23 of the engagement hole 6, it will not come out from the engagement hole 6. It's summery.

In such a configuration, when joining the back plate 1 and the back cushion material 2, each engagement protrusion 5 of the back plate 1 is pressed and fitted toward each engagement hole 6 of the back cushion material 2. One of the engaging surfaces 12b of each engaging protrusion 5 is engaged with the engaging peripheral edge of each engaging hole 6, and the back back plate 1 and the back cushion material are joined. In this case, when the engagement surface 12b of each engagement protrusion 5 is engaged with the engagement peripheral edge of each engagement hole 6, this engagement and the engagement head 10 of each engagement protrusion 5 cause the back plate to 1 is sandwiched between the back plate 1 and the back cushion material 2.
are joined.

Furthermore, even if the positions of the engaging protrusions 5 provided on the overlapping surface 3 of the back cushion material 2 are slightly shifted due to installation errors, the engaging holes 6 provided on the overlapping surface 4 of the back cushion material 2 Even if the position of each engaging protrusion 5 is slightly shifted, and even if the members 2, 5, etc. are slightly deformed, each engaging protrusion 5
When it is press-fitted into each engagement hole 6, the tip of the shaft portion 11 of each engagement projection 5 is guided by the tapered guide receiving surface 23 of each engagement hole 6, and the locking head of each engagement projection 5 is guided. The part 10 moves following the guide of the shaft part 11, and each engagement protrusion 5 is oriented toward each engagement hole 6,
The engagement surface 12b of each engagement protrusion 5 can be easily and appropriately engaged with the engagement peripheral portion of each engagement hole 6.

Furthermore, even if a large external shearing force is applied to the shaft portion of the engagement protrusion 5 while the chair back is in use, the engagement protrusion 5
Since the engagement protrusion 5 is properly engaged with the engagement peripheral edge of the engagement hole 6, the engagement protrusion 5 is hardly bent or broken.

6 and 7 show other embodiments of the invention.

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 engagement protrusion attachment parts 26 are provided at the four corners, and each of these engagement protrusion attachment parts 26
has a circular hole 27 on the outside into which the locking head 10 of the engagement protrusion 5 is inserted and removed; It consists of a rectangular hole 28 having locking edges 30, 30 for moving the head 10 toward the center of the overlapping surfaces and locking the head 10 so that it does not slip out forward. Therefore, by inserting the locking head 10 of the engaging protrusion 5 into the circular hole 27 and moving the locking head 10 to the terminal end 28a of the hole 28, the locking head 1
0 can be locked by the locking edges 30, 30 and the engaging protrusion 5 can be provided protrudingly on the overlapping surface 3 without coming off. Note that the back plate 1 provided with this engaging protrusion 5
If, for example, the overlapping surface 4 of the back cushion material 2 shown in FIG. .

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

(Effects) As described above, according to the present invention, when each engaging protrusion is inserted into each engaging hole, the tip of the shaft portion of each engaging protrusion is guided by the tapered guide receiving surface of each engaging hole. At the same time, the locking head of each engagement protrusion moves following the guide of the shaft part, and each engagement protrusion is accurately oriented to each engagement hole, so even if one member overlaps due to installation error. Even if the position of each engaging protrusion provided on the mating surface is slightly shifted, or even if the position of each engaging hole provided on the mating surface of the other member is slightly shifted, the member will still be slightly deformed. Even if the engagement surface of each engagement protrusion is engaged with the peripheral edge of each engagement hole easily and appropriately. Therefore, it is very easy to join one member to the other, and even when a large external shearing force is applied to the shaft of the engagement protrusion during use of a chair back, etc., it will not work properly. Because they are engaged, the engagement protrusion is unlikely to bend or break.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention, Figure 1 is a perspective view showing the state before the back cushion material is joined to the back plate, and Figure 2 is an enlarged view of the joined state. A side sectional view, FIG. 3 is a perspective view of the engaging protrusion,
Fig. 4 is a front view seen from the line of Fig. 3, Fig. 5 is a perspective view of the engagement hole, 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 the joined state in an enlarged manner. DESCRIPTION OF SYMBOLS 1... Back back plate (one member), 2... Back cushion material (other member), 3... Overlapping surface of back back plates, 4... Overlapping surface of back cushion members, 5...
...Engagement protrusion, 6...Engagement hole, 8, 28...Hole, 1
0... Locking head of the engagement protrusion, 11... Shaft part of the engagement protrusion, 12a... Tapered surface of the engagement protrusion, 12b...
...the engagement surface of the engagement protrusion, 23...the tapered guide receiving surface of the engagement hole.

Claims (1)

[Scope of utility model registration request] A chair back in which one member and the other member are joined to each other by engaging a plurality of engagement protrusions protruding from the overlapping surface of one member into respective engagement holes provided on the overlapping surface of the other member. In the joint structure of the shaft, the engaging protrusion includes a shaft, a tapered surface that gradually widens toward the rear end on the outer surface of the distal end of the shaft, and an axial direction of the shaft from the top of the tapered surface to the shaft. an engaging surface extending in a direction perpendicular to the shaft, and a locking head extending outward from the top of the tapered surface on the rear end side of the shaft, the one member having a locking head that is larger than the shaft and A plurality of holes smaller than the locking head are provided, and the shaft portion of the engagement protrusion is inserted into each hole, and the locking head of the engagement protrusion is located on a surface opposite to the overlapping surface of one member. The engaging hole has a circumferential surface in a direction in which the engaging protrusion is inserted to a sufficient depth, and the circumferential surface of the engaging hole guides the shaft of the engaging protrusion. It is formed on a tapered guide receiving surface to be inserted, and the tip of the shaft portion of the engagement protrusion is guided by this tapered guide receiving surface so that the engagement surface of the locking protrusion is aligned with the engagement hole of the other member. A joint structure for a chair backrest, etc., characterized by being engaged with a peripheral edge.