JP2005349053A - Foldable chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foldable chair improving stability and safety in use. <P>SOLUTION: This foldable chair is formed flatly foldable when being unused by pivoting a connecting part 16 of rear leg members 3 in an intermediate part of front leg members 2, forming guide grooves 26 and 26a along the vertical direction in the intermediate part of the rear leg members 3, and slidably fitting engagement rods 25 and 25a provided in a seat member 4 in the guide grooves 26 and 26a. The guide grooves 26 and 26a along the vertical direction of the rear leg members 3, in their upper ends, are provided with engagement grooves 27 inclined in the frontward side of the center of the guide grooves 26 and 26a so that the engagement rods 25 and 25a fitted in the engagement grooves 27, which are provided eccentric to the guide grooves 26 and 26a, are engaged with formed wall surfaces of the engagement grooves by the weight of the person sitting thereon. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a folding chair that can be folded flat when not in use, and more particularly to a folding chair that can be stacked in addition to folding.

Conventionally, a chair that can be folded is provided for the purpose of increasing or decreasing the number of participants in a meeting or for effective use of the venue, and it is folded and accommodated flat when not in use.
As an example of the folding chair, the upper end of the rear leg member is connected to the middle part of the front leg member having the back portion formed on the upper portion thereof via a link so that the upper leg can be rotated and contacted, and the front leg member and the rear leg member are connected. The seat member was pivotally attached to the middle part of.
When not in use, by rotating the front end side of the seat member upward, the front leg member, the rear leg member and the seat member can be joined in parallel and can be folded flatly as a whole. It was.

However, since the seat member is pivotally attached only at the two positions of the front leg member and the rear leg member, the seat member can be easily rotated in the standing direction and is not stable. When a large load is applied to the rear end side, the seat member suddenly turns to the upright state, the front leg member and the rear leg member close and close, and fingers are placed between the front leg member and the rear leg member. There was a risk of pinching.

In addition, as a chair that can be stacked, a chair with a rear leg member disposed inside the front leg member is used in part, but the upper end of the rear leg member is located on the inner side surface side of the middle part of the front leg member. There was a problem with hitting the elbow.
Furthermore, even though there are foldable chairs and stackable chairs alone, there are no chairs that have both functions, and they can be handled freely in terms of accommodation when not in use, preparation for deployment in the venue, etc. I could not do it.

We do not conduct prior art searches at the research and development stage or application stage, and do not know the prior art documents to be described.

The problem to be solved is that the stability and safety at the time of use are not sufficient, and the accommodation and deployment state at the time of non-use and the preparation stage is limited.

In view of the poor stability of the seat member based on the above prior art, the present invention pivots the connecting part of the rear leg member in the middle part of the front leg member, and extends vertically in the middle part of the rear leg member. A folding chair that has a guide groove and is slidably fitted into the guide groove on the seat member so that it can be folded flat when not in use, along the vertical direction of the rear leg member At the top of the guide groove
By providing the engagement groove inclined forward from the center of the guide groove, the engagement rod fitted into the engagement groove biased with respect to the guide groove is formed on the wall surface where the engagement groove tip is formed by the weight of the seated person. The above-described problem is solved by being in an engaged state.

By providing a short coupling groove that is inclined backward from the center of the guide groove between the guide groove and the engagement groove, the engagement groove becomes longer in the horizontal direction and the engagement stability is improved. Check the open / close state with a shock when passing through the connecting groove.

Further, in view of the problem that the elbow hits the upper end of the rear leg member, the rear leg part is arranged on the inner side from the front leg part, and a biased part is provided between the rear leg part and the connecting part so that the connecting part is located outside the rear leg part. And by connecting the connecting part to the back of the curved part between the front leg and the armrest part, the connecting part at the upper end of the rear leg member is arranged on the back of the front leg member, The above problem is solved by eliminating the protruding state of the member.

In short, in the present invention, the connecting portion of the rear leg member is pivotally attached to the middle part of the front leg member, the guide groove is formed in the middle part of the rear leg member along the vertical direction, and the engaging rod provided on the seat member is provided. Since it is slidably inserted into the guide groove and can be folded flat when not in use, the storage space can be reduced.In addition, since it has an armrest in the middle, the front leg can be transported while holding the chair upper part. The rear leg member and the seat member are not in contact with the back side of the member and do not open, and can be transported easily, and at the upper end of the guide groove along the vertical direction of the rear leg member, the front side from the center of the guide groove Since the engaging groove is provided with an inclined inclination, the engaging rod is seated and engaged with the wall surface where the engaging groove tip is formed, and the engaging rod does not move into the guide groove, thereby improving the stability of the seat member. I can do it.

Between the guide groove and the engagement groove, a short and long connecting groove that is inclined backward from the center of the guide groove is provided. It can be improved, and a light impact is generated when the engaging rod passes through the connecting groove, so that the opening and closing state can be ensured by obtaining a feeling during folding and unfolding.
Further, since the plastic groove material is provided in the guide groove, the coupling groove and the engagement groove, the engagement rod of the seat member can slide smoothly.

Since the connecting piece is installed between the pair of front legs, and the hinge is provided on the rear upper end side of the connecting piece and the back surface of the seat member, the rear leg member and the seat member are substantially matched to improve the flat state. In addition, space reduction and ease of transport can be further improved.

Since the rear leg part is arranged on the inner side than the front leg part, it can be stacked, and a biased part is provided between the rear leg part and the connecting part so that the connecting part is formed outside the rear leg part, and the front leg part and the armrest part Since the connecting portion is pivotally attached to the back surface of the curved portion between, the upper end of the rear leg member is located on the back surface of the curved portion, the upper end of the rear leg member is not located on the side of the armrest portion of the front leg member, Its practical effects such as being able to sit comfortably without a sense of incongruity are enormous.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the chair 1 that can be folded and stacked includes a front leg member 2, a rear leg member 3, and a seat member 4.
As shown in FIG. 2, the front leg member 2 is composed of a pair of left and right square members 5, 5 a with a predetermined interval, and the square members 5, 5 a are connected by horizontal connecting pieces 6, 7 at the middle part and the upper end part.
As shown in FIG. 1, the lower part of the front leg member 2 is formed as an inclined front leg part 8, the middle part is formed as a substantially horizontal armrest part 9, and the upper part is formed as an inclined back part 10. In addition, a backrest 11 having a cushioning property is attached between the connecting piece 7 and the pair of square members 5 and 5a in the upper part, and between the inclined front leg portion 8 and the horizontal armrest portion 9 and between the armrest portion 9 and the inclined backrest. The curved portions 12, 12a are interposed between the portions 10, respectively.
As shown in FIGS. 1 and 2, the rear leg member 3 is composed of a pair of left and right square members 13, 13a that are horizontally connected at a predetermined interval.
The lower leg portion 15 is connected to the lower leg portion 15 and the upper portion is formed integrally with the connecting portion 16.
The seat member 4 has a seat 18 having cushioning properties on a horizontal plate member 17.

As shown in FIG. 3, an interval W1 between a pair of square members 5, 5a, 13, 13a of the front leg member 2 and the rear leg member 3,
The relationship between the width W3 of the seat member 4 and the width W3 of the seat member 4 is substantially the same as the outer distance W2O of the rear leg portion 15 of the rear leg member 3 compared to the inner distance W1 of the front leg member 2 except that there is a small gap between them. The inner distance W2I of the rear leg portion 15 of the rear leg member 3 as compared with the inner distance W1 of the front leg member 2 is the width W of the square members 13 and 13a.
4 is reduced and a space having a small gap is formed, and the width W3 of the seat member 4 is substantially equal to the inner space W2I of the rear leg portion 15 of the rear leg member 3 and there is a small gap between the two. ing.
When these relationships are arranged by mathematical formulas, W1> W2O, W2O-W2I = W4, W1> W2
I + W4, W2I> W3.
Also, in the rear leg member 3, the rear leg 15 is bent in the middle of the rear leg 15 and the connecting part 16 so that the inner distance of the rear leg 15 is W2I and the inner distance of the upper connecting part 16 is W1. -Shaped biasing portion 19 (one biasing amount W
5 = W1-W2I, which corresponds to the sum of W4 and a small amount of gap).
As shown in FIGS. 2 and 3, the shape of the biased part 19 provided in the middle part of the rear leg member 3 is formed in the upper part of the rear leg part 15, the first bent part facing the outer horizontal direction and the upper side from the first bent part. The connection part 16 is integrally formed in the upper part of this 2nd bending part.
Further, a small amount of gap is provided for setting the intervals between the front leg member 2, the rear leg member 3 and the seat member 4, but this small amount of gap takes into consideration non-contact and handling properties.

As shown in FIG. 4, a connecting portion 16 at the upper end of the rear leg member 3 is pivotally attached to the back surface of the curved portion 12 that connects the front leg portion 8 and the armrest portion 9 in the middle of the front leg member 2. 16 has a curved shape that substantially matches the bottom surface shape of the curved portion 12, and the connecting portion 16 is connected to the pivot plate 21 that projects obliquely downward from the curved portion 12.
A pivoting part 20 is constituted by a pivot 22 that crosses the axis.
The intermediate portion of the plate member 17 in the seat member 4 is freely mountable on the connecting piece 6 of the pair of square members 5 and 5a of the front leg member 2, and the hinge hinge is located on the rear side of the upper end of the connecting piece 6. The engagement rods 25 and 25a protrude from both sides of the rear end of the plate member 17 in the seat member 4.
On the other hand, guide grooves 26 and 26a are recessed and formed on the inner surfaces of the square members 13 and 13a of the rear leg portion 15 of the rear leg member 3,
The engaging rods 25, 25a of the seat member 4 are slidably fitted in the guide grooves 26, 26a.

As shown in FIG. 8, the guide grooves 26 and 26a formed in the inner surfaces of the square members 13 and 13a of the rear leg portion 15 are
The square bars 13 and 13a are recessed along the vertical direction at the center in the width direction before and after the square bars 13 and 13a, and the upper ends of the guide grooves 26 and 26a are inclined forward from the centers of the guide grooves 26 and 26a at the time of deployment. That is, the engaging groove 27 is biased from the center of the guide grooves 26, 26a (the square members 13, 13a of the rear leg portion 15).
With this configuration, since the square bars 13 and 13a in which the guide grooves 26 and 26a are formed along the vertical direction are the inclined rear leg portions 15, the guide grooves 26 and 26a are inclined when deployed (in use). The engaging rods 25 and 25a of the seat member 4 are vertically slidable in the vertical direction.
On the other hand, the engaging groove 27 inclined to the front side with respect to the guide grooves 26, 26a inclined toward the vertical direction is inclined toward the horizontal direction, and the forming wall surface 28 below the tip of the engaging groove 27 is formed. Becomes the contact surface of the engagement rods 25, 25a, and is engaged when seated, and is easily slid when there is no load.

Further, at the joint portion between the guide grooves 26 and 26a and the engagement groove 27, a short and long connecting groove 29 that is inclined rearward from the center of the guide grooves 26 and 26a is interposed. ing.
The base end of the engaging groove 27 (to the guide grooves 26, 26a) is formed by an engaging groove 27 and a connecting groove 29 that are opposite in inclination to the guide grooves 26, 26a provided at the center of the square members 13, 13a. The connecting side) is a square bar 13,
The rear side of the center of 13a (extension line of the guide grooves 26 and 26a) and the front end of the engagement groove 27 (the seating contact side of the engagement rods 25 and 25a) are forward of the center of the square members 13 and 13a. Become.
With this configuration, when the connecting groove 29 is interposed, the engaging groove 27 has an inclination angle closer to the horizontal than when the leading end of the engaging groove 27 and the upper ends of the guide grooves 26 and 26a are directly connected. At the same time, the positions of the base end and the tip of the engagement groove 27 are the front and rear of the center, and the engagement groove 27 becomes longer.
, 26a, etc., the movement trajectories of the engagement rods 25, 25a are temporarily reversed.

Next, the operation of the folding chair according to the present invention will be described.
As shown in FIG. 1, when used (deployed), the rear leg 15 is open with respect to the front leg 8, and the engaging rod of the seat member 4 with respect to the guide grooves 26, 26a of the rear leg 15 is shown. 25 and 25a are located at the upper end.
As shown in FIG. 2, the engaging rods 25 and 25a of the seat member 4 are seated and in contact with the wall surface 28 formed at the tip of the engaging groove 27 inclined in the horizontal direction.
When a part of the weight of the seated person acts on the contact point between the engagement groove 27 and the engagement rods 25, 25a, the engagement groove 27 is further inclined to the inclined guide grooves 26, 26a. The engagement rods 25 and 25a maintain the contact state, that is, the seat member 4 maintains the horizontal state.

At the time of folding, the connecting piece 7 at the top end of the front leg member 2 is slightly lifted, and the rear leg portion of the rear leg member 3
15 is in a state separated from the floor, and the seat member 4 is rotated upward by pulling up the front end portion of the seat member 4.
From the engagement relationship between the engaging rods 25, 25a of the seat member 4 and the guide grooves 26, 26a of the rear leg portion 15 and the like, the connecting portion 16 of the rear leg member 3 and the curved portion 12 in the middle of the front leg member 2 are used as a base point. The rear leg member 3 rotates, the rear leg member 3 gradually approaches the front leg member 2, and the rear leg member 3 is closed in a parallel state on the back side of the front leg member 2 as shown in FIGS. The seat member 4 is joined to the rear leg member 3 in substantially the same state.
At the time of this folding, as shown in FIG. 8, the engaging rods 25, 25a located at the tips of the engaging grooves 27
However, when moving from the engaging groove 27 through the connecting groove 29 to the guide grooves 26, 26a, the connecting groove 29 is inclined in the opposite direction with respect to the engaging grooves 27 and the guide grooves 26, 26a. In addition, a slight shock including sound occurs when passing.

When carrying the folded chair 1, as shown in FIG. 5, the center of gravity is indicated by a one-dot chain line, and if the upper connecting piece 7 is held, the chair 1 tilts and the rear leg member 3 The parallel state of the seat member 4 is maintained.

When the folded state is used, the lower end of the front leg 8 of the front leg member 2 is grounded to the floor surface,
By rotating the front end of the seat member 4 downward, the engaging rods 25, 25a of the seat member 4 slide upward in the guide grooves 26, 26a of the rear leg portion 15, and the rear leg member 3 rotates backward. Move, front leg member 2
On the other hand, the rear leg member 3 is opened, the seat member 4 is in a horizontal state, and the deployment operation to the use state is completed.
At this time, shock and sound are also generated when the engaging rods 25, 25a pass through the connecting groove 29 in the middle of the movement from the guide grooves 26, 26a to the engaging groove 27.

The folding chair according to the present invention can be stacked, and as shown in FIG.
A spacing member 30, 30a... Having a predetermined height is formed to protrude from the back surface of 5a and the front surfaces of the square members 13, 13a of the rear leg portion 15.
Further, as shown in FIG. 3, the rear leg member 3 is narrowed by a deviation amount W5 corresponding to the width W4 of the square members 13 and 13a with respect to the front leg member 2 so that the unfolded chair 1 is moved up and down. Stack up.
As shown in FIG. 7, when stacked, the upper front leg member 2 is the lower front leg member 2, the upper rear leg member 3 is the lower rear leg member 3, and the upper seat member 4 is the lower seat member 4. The upper and lower front leg members 2 and rear leg members 3 are stacked with spacing members 30, 30a... Interposed therebetween, respectively.

The guide grooves 26, 26a, the engagement grooves 27, and the connection grooves 29 are formed on the surfaces on which a wax material is applied in order to ensure slidability, or as shown in FIG. The groove material 31 may be fitted.

It is a side view of the folding chair which concerns on this invention. It is a front view of FIG. It is a top view of FIG. It is AA sectional drawing of FIG. It is a side view which shows a folded state. It is a center longitudinal cross-sectional view of a folded state. It is a side view which shows a stacked state. It is an enlarged side view which shows a guide groove. It is a fragmentary sectional end view which attached the groove material to the guide groove.

Explanation of symbols

2 Front leg member 3 Rear leg member 4 Seat member 6 Connecting piece 8 Front leg part 9 Armrest part
10 Back
12, 12a Curved part
15 Rear legs
16 Connecting part
19 Deviation
24 Hinge
25, 25a engagement rod
26, 26a Guide groove
27 Engagement groove
28 Forming wall
31 Groove material

Claims (5)

A front leg member in which a dorsal part is formed in the upper part, an armrest part is formed in the middle part, and a front leg part is formed in the lower part; a rear leg member in which a connection part is formed in the upper part and a rear leg part is formed in the lower part; A seat member pivotally attached to the rear part and the rear leg part,
The connecting part of the rear leg member is pivotally attached to the middle part of the front leg member, a guide groove is formed in the middle part of the rear leg member along the vertical direction, and the engagement rod provided on the seat member can be slid into the guide groove. Inserted into
A folding chair that can be folded flat when not in use,
A folding chair characterized in that an engaging groove inclined to the front side from the center of the guide groove is provided at the upper end of the guide groove along the vertical direction of the rear leg member. 2. The folding chair according to claim 1, wherein a short connecting groove that is inclined rearward from the center of the guide groove is provided between the guide groove and the engagement groove. The folding chair according to claim 2, wherein a plastic groove material is fitted into the guide groove, the connecting groove, and the engaging groove. The folding chair according to claim 1, 2, or 3, wherein a connecting piece is constructed between the pair of front legs, and a hinge is provided on the rear side of the connecting piece and the back surface of the seat member. The rear leg part is arranged inside the front leg part, a biasing part is provided between the rear leg part and the connection part, the connection part is formed outside the rear leg part, and the back surface of the curved part between the front leg part and the armrest part 5. The folding chair according to claim 1, wherein the connecting portion is pivotally attached to the folding chair.

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