JP6677529B2 - Collapsible chair coupling device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a folding chair connecting device capable of connecting a plurality of folding chairs in a lateral direction.

  In recent years, a large number of folding chairs collected by leasing or rental are used in various event venues and the like, and in this case, in consideration of easy deployment and easy storage, a plurality of folding chairs such as three legs, four legs, etc. In many cases, a connecting chair is used in which the connecting chairs are connected laterally. As such a connecting device for folding chairs, there is known a connecting device in which one connecting pipe extending in the lateral direction is provided on the back side of a seat plate of the folding chair, and each chair is connected by this connecting pipe ( For example, see Patent Literature 1).

  In the folding chair described in Patent Document 1, a boss is projected downward from the seat frame of the chair, a connecting pipe is passed between the bosses in series, a bolt is inserted from the lower surface of the connecting pipe, and the boss is passed through the boss. The bolts are screwed to the connection pipe with the bolt ends hooked on the seat frame, so the boss is welded to the seat frame, or the bolts are hooked on the inner surface of the seat frame with the bolt tips invisible. The configuration is complicated, and the mounting operation is complicated. In addition, since the entire connecting pipe is exposed on the back of the seat, when the chair is folded, the connecting pipe appears on the outer surface, and when stacking multiple folding chairs, it may scratch or fold other chairs. Laying a chair on the floor may damage the floor. A configuration is also known in which a boss is not protruded from the seat frame, and a substantially Ω-shaped mounting member (saddle band) is screwed to the seat portion at two intervals with screws and a connecting pipe is mounted in series. Since both ends of the member are screwed at two places, the number of screwed places is increased and the mounting operation is troublesome, and the connecting pipe and the mounting bracket are exposed. There is a possibility of giving, it cannot be said that it is satisfactory. In addition, since the cross-sectional shape of the connecting pipe is circular, when the chair is deployed or folded, the mounting member and the connecting pipe relatively rotate, and the adjacent chair may slip or rotate, Workability is not good. When the cross-sectional shape of the connecting pipe is a circular cross-section, the amount of protrusion that protrudes outward from the back surface of the seat increases, so that damage is more likely to occur from this point as well.

  In the folding chair described in Patent Literature 1, the front legs of the adjacent chairs are connected by bolts via collars while being connected by the connection pipe, but in such a configuration, a screw is screwed from the lateral direction of the legs. Installation work is troublesome because it must be stopped. Therefore, there is also known a connecting tool in which a pair of members having semi-cylindrical portions formed in parallel on both sides of the flat portion are provided, and these members are fitted to legs of adjacent chairs and connected by the flat portions. (For example, see Patent Document 2). However, in the connecting device described in Patent Document 2, since the edges of the semi-cylindrical portions are just abutted in a state where the connecting device is attached to the chair, a force such that the chair shakes and twists the connecting device acts. Then, there is a possibility that the edge is easily opened, the fingers or clothes are pinched, or the legs are detached from the semi-cylindrical portion and the chair is separated.

Japanese Utility Model Publication No. 42-19379 (claims for utility models, drawings) Japanese Utility Model Publication No. 56-23532 (Claims for utility models, drawings)

  The problem to be solved by the present invention is to provide a connecting device for a folding chair in which the folding chairs can be easily connected, there is little risk of damaging other parts, and it is hard to break.

According to the present invention, there is provided a box-shaped mounting box having both side plates and an outer surface plate covering between the both side plates, and a pair of connecting tools having leg insertion grooves formed on both sides of the fastening portion, A through-hole for inserting a connecting pipe is formed in both side plates, an engaging piece is formed at an edge of a leg insertion groove of the connecting tool, and the mounting box is folded on a back surface of a seat portion of a chair. mounting, the legs of the chair adjacent together when passing the connecting pipe into the through hole is inserted into the leg insertion groove of the connector folding, characterized in that fastened the fastening portion engaged with the engaging piece A connecting device for a chair is provided to solve the above problem.

  Further, according to the present invention, an insertion piece is formed at one end of the mounting box, and a screw insertion hole is formed at the other end, and the insertion piece is inserted into a slit provided in the seat, and a screw insertion hole is formed. And the through-holes of the connecting pipe and the mounting box are formed to have a substantially elliptical cross section. Further, the engaging piece of the connecting tool protrudes from the step formed at the edge of the leg insertion groove at an insertion interval, and the connecting tool faces the engaging piece in a state where the step contacts. And a connecting device for the folding chair that fits in the insertion gap of the folding chair.

  The present invention provides a box-shaped mounting box having the above-mentioned structure and having a side plate and an outer plate covering between the both plates on the back surface of the seat portion of the folding chair. Since the connecting pipe is inserted so as to penetrate, the mounting mechanism of the connecting pipe is simplified, the connecting pipe is almost hidden by the mounting box, and the portion exposed to the outside can be reduced as compared with the conventional mounting bracket, There is little risk of damaging other chairs or damaging the floor as in the past. Further, a pair of connecting tools having leg insertion grooves formed on both sides of the fastening portion are provided, and an engagement piece is formed at an edge of the leg insertion groove of this connecting tool, so that the legs of the adjacent chair are connected to the connecting tool. By inserting the fitting into the leg insertion groove and fastening the fastening portion in a state where the engaging pieces are engaged with each other, the connecting member can be firmly attached. Therefore, even if an unreasonable force acting to separate the connecting tool acts on the chair, the engaging pieces are engaged with each other, so that the edge does not easily open, and pinching of fingers and separation of the chair are avoided. Can be.

  In addition, when the insertion piece and the screw insertion hole are provided on both ends of the mounting box, and the insertion piece is inserted into the slit provided in the seat and the screw is inserted into the screw insertion hole and attached to the seat, it is difficult to mount the product on the seat. The number of screwing points is reduced, and mounting work is simplified. When the connection pipe and the mounting hole of the mounting box are formed in a substantially elliptical cross section, the connecting pipe and the mounting box can be prevented from relatively rotating in the inserted state, and the folding chair connected in the horizontal direction can be unfolded, The chair does not slip when folded, making it easy to work. In addition, the projecting amount of the connecting pipe projecting from the seat to the back side is smaller than that of a pipe having a circular cross section, and the possibility of damage can be reduced.

  Furthermore, since the engaging piece is provided at the edge of the connecting tool so as to mesh with each other, even if an unreasonable force such as separating the connecting tools acts on the chair, the engaging piece engages the connecting tool, so that the connecting tool is engaged. It can be prevented from being easily separated, a gap is hardly generated between the connecting tools, and fingers, clothes and the like can be prevented from being caught.

BRIEF DESCRIPTION OF THE DRAWINGS The front view of the folding chair which showed one Example of this invention and which connected three legs. FIG. 3 is a front view of a part of the folded state with a part omitted. 4A and 4B show a mounting box, wherein FIG. 4A is a perspective view, FIG. 4B is a plan view, and FIG. FIG. 3 is an exploded perspective view showing a coupling tool. Explanatory drawing of the coupling tool in the separated state.

  The present invention can be applied to various types of folding chairs. In the drawings showing one embodiment, a front leg 1, a rear leg 2 and a seat 3, which are foldably connected to the front leg 1, and a front leg The front leg 1 and the rear leg 2 can be folded by pivoting upward with the back portion 4 provided above and holding the front portion of the seat portion 3 in a known manner. When the is rotated downward, the front leg 1 and the rear leg 2 are opened, and the seat 3 is deployed in a substantially horizontal state, and the user can sit down.

  A substantially box-shaped mounting box 5 is mounted on the back surface of the seat 3 of the folding chair. The mounting box 5 is preferably formed of a plastic material, is formed in a substantially rectangular shape as shown in FIG. 3, and has side plates 6 standing on both sides. The side plate 6 is formed such that an inner side 7 on the back side of the seat portion 3 is formed linearly along the seat portion and a shape in which a central portion is curved outward, and an outer edge 8 on a side away from the seat portion is The center portion is formed in an arc shape bulging away from the back surface of the seat portion so as to form a space between the seat portion and the side plate so that the outer side 8 is located more inward than the inner side 7 on the back surface side. The whole is inclined. The side plate 6 has a long hole formed in the direction along the back surface of the seat portion, and in the embodiment shown in the drawing, a through hole having a substantially long elliptical cross section having a straight portion along the inner side and the outer side. Is formed. Due to the above shape, the mounting box is formed thin as a whole, has strength, and can be hardly broken even when the folded chairs are stacked.

An outer surface plate 10 is formed on the mounting box 5 so as to cover both side plates 6. At both ends of the one end side of the outer surface plate 10 has a rectangular insertion piece 11 is projected, the screw insertion holes 12 are found provided at both ends of the other end. As shown in FIG. 2, two slits 13 into which the insertion pieces 11 are inserted are opened on the back surface of the seat 3 so as to correspond to the insertion pieces 11 and the screw insertion holes 12. An embedding nut 15 for screwing is embedded. Further, in the substantially central portion of the outer surface plate 10 fixing hole 16 that Saramomi opening edge is al provided. The inner surface of the outer panel 10 is provided with a horizontal rib 17 connecting both ends of the through hole 9 and a vertical rib 18 extending between the horizontal rib 17 and an edge of the outer panel. Has a raised portion 19 formed therein.

  The front legs 1 of the adjacent folding chairs are connected by a pair of connecting tools 20. The connecting member 20 is preferably formed of a plastic material, and has leg insertion grooves 22 formed on both sides of a substantially flat fastening portion 21. A fastening hole 23 is formed at the center of the fastening portion 21, and two bosses 24 and a boss hole 25 that can be fitted to a boss of an opposing connector are protruded at the inner corner, and A rib 26 is provided. The leg insertion groove 22 can be formed in a shape such as a semicircular cross section corresponding to the cross sectional shape of the leg, but in the embodiment shown in the figure, the cross sectional shape of the front leg 1 of the folding chair is a flat and substantially elliptical cross section. Therefore, it is formed in a substantially semi-elliptical cross section corresponding to the shape. At the edge of the wall 27 forming the leg insertion groove 22, a step 28 is formed which extends outward at a thickness of half the thickness of the edge, and engages with the outside of the step 28. A piece 29 protrudes. The engaging piece 29 has an arc-shaped tip end projecting outward from the stepped portion, and is provided with a plurality of insertion gaps 30. The insertion gaps 30 are formed outside the wall portion and have a bottomed arc shape. It is a receiving groove. The tip of the engagement piece 29 is slightly inclined toward the stepped side. When the pair of connecting tools are joined together by this inclination, the engagement piece fits into the insertion gap 30 to form the wall 27. By engaging with the outer surface and fitting the boss 24 into the boss hole 25, the connecting member can be firmly connected. A rib 31 surrounding both sides of the fastening hole 23 is also provided on the outer surface of the connecting tool 20.

  The connecting pipe 32 inserted into the mounting box is formed in a shape corresponding to the cross-sectional shape of the through hole 9 provided in the mounting box. In the embodiment shown in the drawing, a straight portion corresponding to the elongated through hole is formed. Is formed in a substantially elliptical cross section having The through hole 9 and the connecting pipe 32 can be formed in a circular cross section, a rectangular cross section, or any other appropriate shape as desired. As in the embodiment, when the shorter side is made to be the folding direction of the seat portion as the pipe having a substantially elliptical cross section, the thickness of the mounting box 5 can be made thinner than the round pipe. Can be fitted so as not to rotate relative to the folding chair, so that the folding and unfolding operation of the folding chair is stable and operability is increased. The connecting pipe 32 is provided with a screw hole 33 at a position corresponding to the fixing hole 16 provided in the mounting box 5.

  In order to connect the folding chair with the above configuration, the insertion piece 11 of the mounting box 5 is inserted into the slit 13 provided on the back surface of the seat portion 3, and the screw 14 is inserted into the screw insertion hole 12, so that the embedded chair provided on the back of the seat portion is provided. The mounting box 5 is fixed to the seat portion 3 by screwing it to the mounting nut 15. Then, the connection pipe 12 is communicated with the through hole 9 of the mounting box 5 of the adjacent chair, and the fixing hole 16 is screwed through the screw 34. On the other hand, two connecting tools 20 are applied from the front and back of the front leg 1 of the adjacent chair, the leg 1 is fitted into the leg insertion groove 22, and the engaging piece 29 of each connecting tool 20 is engaged with the mating connecting tool. If the fastening portion 21 is screwed with the screw 35 and the nut 36, the folding chair is securely connected in the lateral direction by the connecting pipe 32 and the connecting tool 20.

  Since the present invention is configured as described above, the left and right folding chairs can be securely connected without being shaken, and the unfolding and storing operations are simple. In addition, assembling can be easily performed with a mounting box and a pair of connecting tools, so that the operation is easy and quick, and the number of parts is small, so that it is economical.

REFERENCE SIGNS LIST 1 front leg 2 rear leg 3 seat 5 mounting box 9 through hole 11 insertion piece 12 screw insertion hole 13 slit 15 embedding nut 20 connecting tool 21 fastening part 22 leg insertion groove 24 boss 25 boss hole 29 engagement piece 32 connecting pipe

Claims (6)

A box-shaped mounting box having both side plates and an outer surface plate covering between the both side plates, and a pair of connecting tools having leg insertion grooves formed on both sides of the fastening portion, and a connecting pipe is provided on both side plates of the mounting box. Is formed, an engaging piece is formed at the edge of the leg insertion groove of the connecting tool, a slit and an embedding nut are provided in the seat of the folding chair, and the mounting An insertion piece is formed on one end side of the box, and a screw insertion hole is formed on the other end side. The insertion piece is inserted into the slit provided in the seat, and the screw is inserted into the screw insertion hole and screwed into the seat. have been installed on the rear surface of the seat portion of the folding chair to the mounting box, the legs of the adjacent chair with passing the connecting pipe into the through hole engaged the engagement piece is inserted into the leg insertion groove of the connector fastening It is characterized by tightening the part Coupling device of that folding chair.   The folding chair connecting device according to claim 1, wherein the cross-sectional shape of the connecting pipe and the cross-sectional shape of the through hole of the mounting box are formed to be substantially elliptical in cross section. The connecting device for a folding chair according to claim 2 , wherein the substantially elliptical cross section is formed to be long in a direction along the back surface of the seat portion.   The engaging piece of the connecting tool protrudes from the step formed at the edge of the leg insertion groove at an insertion interval, and the connecting tool is inserted with the engaging piece facing the engaging piece in a state where the step contacts. The connecting device for a folding chair according to claim 1, which fits in the gap. The connecting device for a folding chair according to claim 4 , wherein a tip end of the engagement piece is inclined toward a step portion. The connecting device for a folding chair according to claim 4 or 5 , wherein a boss and a boss hole are formed in a fastening portion of the connecting tool.

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