Folding auxiliary device of foldable cargo shelf for chair

Abstract

To solve such a problem that, in a conventional technique, a shelf board can be easily lowered during use but it is extremely difficult to fold back the shelf board after use in a foldable cargo shelf attached to a folding chair.SOLUTION: A cargo shelf device according to the present invention includes a base body which is attached to the lower side of a seat part of a folding chair, turns a suspension body into a suspended state by connecting the upper stage of the suspension body that connects the upper stage, middle stage and lower stage of a suspension board arranged in an upper part and a lower part with a hinge to the left and right sides, or the left and right sides and rear side of the base body, and connects the left and right sides, or the left and right sides and rear side of the cargo shelf to the lower stage of the suspension body, or the left and right sides of the shelf board and the lower stage of the suspension body. The cargo shelf device includes means which moves the hinge on the middle stage to an appropriate point on the orbit in the folding direction of the hinge on the middle stage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an auxiliary device for a foldable luggage shelf, which is mainly attached to the underside of a chair seat, for easily and quickly folding the luggage shelf. [Background technology]

[0002] Conventionally, with a foldable luggage rack attached to a folding chair, it is easy to lower the shelf board when using the rack, but it is extremely difficult to fold the shelf board after use. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent application 2020-39373 [Patent Document 2] Patent No. 6794086 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to solve the problems of Patent Documents 1 and 2 mentioned above. The following description is based on confirmation of the use of the prototypes of Patent Documents 1 and 2 when they were actually attached to a folding chair. Patent Document 1 discloses an attachment member located at the top and a hanging body hanging from both ends of the attachment member, which consists of two hanging plates at the top and bottom, and hinges at the top, middle and bottom, with a cargo shelf connected to the lower section of the hanging body.When the entire cargo shelf configuration is viewed from the front, the shape of the attachment member as the top edge, the hanging body as both side edges, and the shelf board as the base is a right-angled quadrilateral, and as the shelf board is suspended directly below the attachment member, the three hinges on each side are arranged in a vertical straight line. When folding down this luggage rack, one hand is placed on the top of the chair and the other is used to pull the shelf straight up; however, because the hinges are arranged in a straight line, the top and bottom hanging panels are pushing against each other, making it impossible to fold up the luggage rack.

[0005] So, in order to avoid this pushing against each other, when the shelf was pulled up while swinging it back and forth, both left and right hanging bodies swung in the same direction, and when the middle hinge of the hanging body that moved outward came into contact with the leg of the folding chair, the shelf became fixed in place, and in the end, not only the shelf but also the folding chair could not be folded up. Furthermore, many chairs have a low rear seat to make them more comfortable to sit on, and if a luggage rack with a rear suspension is attached to such a chair, the rear suspension is already tilted backwards when the chair is placed on the floor, so the luggage rack cannot be folded up even if the shelf is pulled up straight.

[0006] Next, Patent Document 2 was made to solve the problems with Patent Document 1, and this configuration tilts the hanging body by making the width of the upper part narrower than the width of the lower part, and by utilizing the weight of this hanging body, it is possible to fold the luggage shelf by encouraging the initial movement of the middle hinge part in the folding direction. An important thing to note here is that when folding up a luggage rack with this configuration, it can be folded up by pulling up only the shelf board, but if the chair itself is tilted backwards due to haste or careless work, the inclined rear suspension body will tilt beyond the vertical and become inclined in the opposite direction, causing the middle hinge part to sag and making it impossible to fold up the luggage rack. Furthermore, the configuration of Document 2 has a problem in that the upper and lower hanging plates are different sizes, which significantly increases the cost of the molds required during manufacturing. Therefore, the object of the present application is to provide a luggage shelf device that can be folded easily and quickly by always moving the middle hinge portion of each of the hanging hanging bodies mentioned above on a track in the folding direction, thereby eliminating the tension in the hanging bodies themselves. [Means for solving the problem]

[0007] The present invention is a luggage shelf device which comprises a base for attachment to the underside of the seat of a folding chair, and an upper section of a hanging body which connects the upper, middle and lower sections of hanging plates arranged at the top and bottom with hinges to the left and right side edges or the left and right side edges and rear edge of the base so that the hanging body is in a hanging state, and which connects the left and right side pieces of a shelf board to the lower section of the hanging body, and the left and right edges or the left and right side edges and rear edge of a luggage shelf to the lower section of the hanging body, and is provided with means for moving the middle section hinge to an appropriate location on the track in the folding direction.

[0008] Effect of the Invention In the present application, the hinge portions at the middle sections of each hanging suspension body are moved in advance to appropriate positions in the folding direction of the luggage shelf, thereby enabling the luggage shelf to be folded up easily and quickly. [Brief description of the drawings]

[0009] [Figure 1] This is a front view of the first embodiment of the present invention, showing the cross section taken along line bb in FIG. [Diagram 2] FIG. 2 is a cross-sectional view of FIG. [Diagram 3] FIG. 2 is a cross-sectional view of the luggage shelf of the first embodiment. [Figure 4] FIG. 4 is an enlarged view of part A in FIG. [Diagram 5] FIG. 4 is a cross-sectional view of the luggage shelf of FIG. 3 in a folded state. [Figure 6] FIG. 4 is an enlarged view of the second embodiment of the present invention. [Figure 7] FIG. 7 is an enlarged view of the luggage shelf of FIG. 6 in a folded state. [Figure 8] FIG. 11 is an enlarged view of the third embodiment of the present invention. [Figure 9] FIG. 9 is an enlarged view of the luggage shelf of FIG. 8 in a folded state. Modes for carrying out the invention

[0010] The folding assistance device for a folding luggage rack for chairs of the present invention is not limited to the embodiments described below, but can be modified as appropriate within the scope of the technical concept of the present invention, i.e., within the range of shapes and dimensions that can achieve the same functional effects. Example 1

[0011] A first embodiment of the present invention will be described in detail with reference to FIGS. 1, 2, 3, 4 and 5. FIG. Example 1 is a cross-sectional view seen from the front showing the luggage shelf device of the present invention in a state in which it can be used, with hanging bodies 2 / 2 connected in a suspended state to the left and right sides of base body 1 fixed to the underside of seat D by upper hinges 4 / 4, and rear hanging body 3 connected to the centre of the figure by upper hinge 4, and shelf board 9 is further connected to the side hanging bodies 2 / 2 and rear hanging body 3 by lower hinges 6 / 6 / 6. The side hanging bodies 2·2 are bent in the folding direction of the luggage shelf by their respective middle hinges 5·5, and the rear hanging body 3 is also bent in the forward direction as shown (3 in Figure 2) by the middle hinge 5. In order to maintain the bending of the hanging bodies 2·2 in the folding direction, in this embodiment, a resilient body as described below is provided near the upper hinge.

[0012] Next, Figure 2 is a cross-sectional view of the a-a line in Figure 1, and like the side hanging body 2, the rear hanging body 3 also bends in the folding direction at the middle hinge 5.By aligning the shapes of the side hanging bodies 2·2 and the rear hanging body 3 as shown in Figures 1 and 2, the cost of the mold can be reduced.

[0013] Next, Figure 3 is an enlarged view of the cargo shelf, in which the position of the middle hinge 5.5 of the symmetrical hanging bodies 2.2 is located inside the straight line connecting the upper hinge 4 and the lower hinge 6. This position is the stopping point K, which is appropriately set on the track K for the middle hinge 5.5 when folding up the cargo shelf, and since the middle hinge 5.5 has been moved to this stopping point K in advance, the cargo shelf can be folded up easily and quickly. In this embodiment, the spring for moving the middle hinges 5·5 to the stop point K position is a tension coil spring 11 stretched between the base body 1 and the upper hanging plate 7. And because this coil spring is flexible, when a large load is placed on the luggage rack, and the hanging body 2·2 is pushed by the load, the middle hinge 5·5 moves until it comes into contact with the chair legs B·B, widening the inner width of the luggage rack, and when the load is removed, the middle hinge 5·5 returns to its original stopping point K by the action of the coil spring 11, so that the luggage rack can be folded up immediately.

[0014] Next, Figure 4 is an enlarged view of Figure 3, and shows the coil spring 11 suspended between the base body 1 and the upper hanging plate 7. The pulling strength and attachment position of the coil spring in this embodiment are adjusted so that the middle hinges 5·5 can be stopped at the stopping point K. Furthermore, the strength of the coil spring 11 is only enough to pull the hinge 5 to the stop point K, and is not strong enough to keep the shelf 9 completely folded up. To compensate for this, for example, a configuration in which the shelf 9 is pulled in by a magnet is effective.

[0015] Next, FIG. 5 is a cross-sectional view of the luggage shelf of this embodiment in a folded state, in which the symmetrical hanging bodies 2·2 and shelf board 9 are folded up and the coil springs 11·11 are in their most contracted state.

[0016] Next, a second embodiment of the present invention will be described in detail with reference to FIGS. In this embodiment, in order to move the middle hinge to a stopping point on the track, a leaf spring 12 machined into the shape shown in the figure is provided inside the base body 1 to hold down the upper suspension body 7. Furthermore, as shown in FIG. 7, a locking portion 13 is formed at the tip of the leaf spring 12, and this locking portion 13 also functions as a latch lock to maintain the shelf board 9 in the folded up state. Therefore, the leaf spring 12 can eliminate the need for a means for maintaining the shelf in the folded state required in the first embodiment.

[0017] Next, a third embodiment of the present invention will be described in detail with reference to FIGS. In Figure 8, in order to stop the middle hinge 5·5 at the stopping point K on the track, a spring 14 is provided on the middle hinge 5 which is connected to the upper hanging plate 7 and the lower hanging plate 8, and the part of this spring 14 which comes into contact with the lower hanging plate 8 is fixed 15 to the lower hanging plate 8. Even if the hinge 5·5 is pushed by a placed object and moves to the dotted line position, if the placed object is removed, the spring 14 will instantly return it to its original stopping point.

[0018] Next, FIG. 9 shows the luggage rack of this embodiment in a folded-up state. Since the springs 14 are fixed 15 to the lower hanging plate 8, the springs 14 do not interfere with the folding operation of the luggage rack, as shown in the figure. In all the embodiments described above, the luggage rack, which was previously difficult to fold, is provided with a spring, which makes it possible to fold it easily and quickly. Furthermore, this is of great significance in that it makes it possible to commercialize the luggage rack of the present invention. [Explanation of symbols]

[0019] A: Folding chair B: Legs C: Seat frame D: Seat part 1: Base body 2: Side suspension body 3: Rear suspension body 4: Upper hinge 5: Middle hinge 6: Lower hinge 7: Upper hanging board 8: Lower hanging board 9: Shelf board 11: Coil spring 12: Leaf spring 13: Locking part 14: Spring 15: Fixing part KA, KI, KU: Operation direction arrow KE: Stop point

Claims

1. a base for mounting to the underside of a seat of a folding chair; The upper section of a hanging body is connected to the left and right sides or the left and right sides and the rear side of the base body by hinges to connect the upper, middle and lower sections of hanging plates arranged at the top and bottom to the upper and lower sections of the hanging body, so that the hanging body is in a hanging state; A shelf device in which the left and right sides or the left and right sides and the rear side of a shelf board are connected to the lower stage of the hanging body, The folding assist device for a folding luggage rack for chairs is provided with a means for moving the middle hinge to an appropriate position on a track in the folding direction of the middle hinge.

2. 2. A folding assist device for a folding luggage shelf for chairs as described in claim 1, wherein the means for moving the middle hinge is a resilient body provided at one or more locations on the base and the upper hanging plate, or on the upper hanging plate and the lower hanging plate at the hinge portion of the middle stage, or on the lower hanging plate and the shelf at the hinge portion of the lower stage.

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