JP3159270U - Folding chair seat automatic folding device - Google Patents

Abstract

An automatic seat folding device for a folding chair that can be automatically folded by a gentle operation is provided. An automatic folding device for a folding chair includes an automatic folding device in which a pivotal portion between a seat of the folding chair and a front foot frame is fitted to a rotation pivot, and the automatic folding device is fixed to a spiral spring. Including a rod, the fixed rod is vertically mounted on the forefoot frame, the first end of the spiral spring is fitted and connected to the pivot axis, and the second end of the spiral spring surrounds the periphery of the fixed rod. When the user sits on the folding chair, the rotation pivot rotates in a certain direction, and the second end of the spiral spring presses against the fixed rod, the spiral spring creates tension, and the user holds the chair When the pressure on the sheet is released away, the vortex spring releases the tension and drives the rotating pivot to rotate in another direction, automatically rotating the sheet to the folded state. [Selection] Figure 1

Description

  The present invention relates to a design area of a kind of folding chair, and more particularly to a folding chair in which a kind of seat is automatically folded.

  The seat of the folding chair is usually pivoted inside the forefoot frame using two sets of pivotal structures, so that the seat can be folded. The seat folding method of a traditional folding chair is manual folding, in which the unfolded seat is turned into a vertically folded state. Due to its inconvenience, a seat folding structure has already been developed, in which a tension spring is connected to the bottom of the chair frame on one side, the other end of the tension spring is connected to the forefoot frame, and the chair is deployed. Sometimes, the tension spring is stretched and tension is applied, and when the pressure on the chair is released, the tension spring recovers to its original state, and the seat is rotated to a vertically folded state.

  However, the use of the tension spring in the conventional automatic folding apparatus for folding chairs has the following drawbacks. First, the recovery speed of the tension spring is too fast, and when the seat is automatically folded, it quickly collides with a stopper installed on the chair frame and generates noise. Next, the entire sheet folding structure is exposed below the sheet, and it is easy for the user to be injured. Thirdly, when actually used, the tension spring is very easily elastically fatigued, and if it is elastically fatigued, the sheet folding operation becomes uncertain. For this reason, there has been a need to improve the conventional automatic folding device for folding chairs.

  Disadvantages that the folding speed of the well-known folding chair automatic seat folding device is too fast, is easy to generate noise, the folding structure is exposed to the bottom of the seat and easily injures the user, and the tension spring tends to cause elastic fatigue Therefore, the present invention aims to provide a kind of automatic folding device for a folding chair, which can perform a seat folding operation gently and automatically folds into a predetermined position without generating noise, and The automatic folding device has a protective cover that shields the structure, does not hurt the user, the automatic folding device adopts a vortex spring, the spring has a relatively high steel property and does not easily cause elastic fatigue, The shortcomings of the technology shall be solved.

  In order to achieve the above-mentioned object, the seat automatic folding device of the folding chair provided by the present invention includes an automatic folding device in which a pivotal portion between the seat of the folding chair and the forefoot frame is fitted to a rotating pivot, The automatic folding device includes a vortex spring and a fixing rod, the fixing rod is vertically installed on the forefoot frame, and a first end of the vortex spring is fitted and connected to the rotating pivot, and the vortex spring The second end of which surrounds the periphery of the fixed rod. When the user sits on this folding chair, the rotating pivot rotates in a predetermined direction, and the second end of the spiral spring presses against the fixed rod, the spiral spring creates tension, and the user holds the chair When the pressure on the sheet is released away, the spiral spring releases the tension and drives the rotating pivot to rotate in another direction, automatically rotating the sheet to the folded state.

  The present invention employs a vortex spring instead of the conventional tension spring to relieve the rotational force of the sheet and the service life of the vortex spring is higher than that of the tension spring. Can be secured.

  Since the second end of the above-described spiral spring surrounds the fixed rod, the sheet is restricted from rotating further when the sheet rotates and the second end of the spiral spring contacts the second point of the fixed rod. Thus, collision with the stopper due to excessive rotation of the sheet is prevented from generating noise.

  In addition, the automatic folding device is further provided with a cover, which is connected to the end surface of the fixed rod by the connecting device, and the cover covers the entire automatic folding device, thereby preventing injury to the user.

  As can be seen from the above, the automatic folding device for a folding chair provided by the present invention has a reduced folding operation, no noise, is safe and has a long service life compared to the conventional automatic folding device.

1 is an exploded view of a preferred embodiment of a seat automatic folding device for a folding chair according to the present invention. It is another three-dimensional exploded view of a preferred embodiment of the automatic folding device of the folding chair of the present invention. It is the combination figure of the preferred Example of the sheet | seat automatic folding apparatus of the folding chair of this invention. It is a front view after the folding of the folding chair which used this invention. It is an operation | movement figure of the preferable Example of the sheet | seat automatic folding apparatus of the folding chair of this invention. It is an operation | movement figure of the preferable Example of the sheet | seat automatic folding apparatus of the folding chair of this invention.

  1, FIG. 1A and FIG. 2 are respectively a three-dimensional exploded view and a combination view of a preferred embodiment of the automatic folding apparatus for folding chairs of the present invention. Between the seat frame 11 and the forefoot frame 2 of the folding chair, there is a pivot 3, which includes a connecting plate 32 connected to the seat frame 11 and a rotary pivot 31. The rotating pivot 31 has two opposite ends, the first end is designed to be semicircular, and the second end is designed to be cylindrical. The connecting plate 32 has a semicircular fixing hole 321 corresponding to the first end of the rotary pivot 31. The first end of the rotary pivot 31 penetrates the forefoot frame 2 laterally and penetrates the fixing hole 321 of the connecting plate 32, and the second end is exposed on the surface of the forefoot frame 2. It rotates with the rotation pivot 31 to prevent idling of the rotation pivot 31 in the fixed hole 321, thereby driving and rotating the seat 1. The automatic folding device 4 is installed on the surface of the forefoot frame 2 by the rotary pivot 31. When the human body is separated from the seat 1, the automatic folding device 4 automatically rotates the seat 1 upward to be in a folded state.

  Specifically, the automatic folding device 4 is installed on the reinforcing block 46. The width and thickness of the reinforcing block 46 match the width and depth of the forefoot frame groove 21, whereby the reinforcing block 46 is welded to the forefoot frame groove 21, thereby increasing the strength of the automatic folding device 4. The automatic folding device 4 includes a fixed rod 42, the rotary pivot 31 described above, and a spiral spring 41. The fixed rod 42 is vertically installed on the reinforcing block 46 by a welding method. A first end of the rotary pivot 31 penetrates a part of the forefoot frame 2 provided with the reinforcing block 46 laterally, and is coupled to the connecting plate 32, and a second end of the rotary pivot 31 is exposed outside the reinforcing block 46, In addition, a split groove 311 extending to a part of the circumferential surface is provided on the end face. The spiral spring 41 generates an elastic recovery force that is relaxed compared to a tension spring and has a relatively long service life. The spiral spring 41 has both ends, of which the first end 411 is fitted into the rotary pivot 31 and is fitted into the split groove 311, the second end 412 is bent into a substantially annular shape, and the fixed rod 42, the body of the spiral spring 41 contacts the surface of the reinforcing block 46, and the spiral spring 41 is indirectly installed on the forefoot frame 2. In order to prevent the structure of the automatic folding device 4 from being exposed to the outside of the forefoot frame 2 and causing injury to the user, a cover 43 is further designed, and the shape of the cover 43 is not limited. The rotating pivot 31 and the vortex spring 41 may be covered. For connecting the cover 43, a first connecting device 44 is adopted, which includes a bolt 441 and a nut 442, the bolt 441 passes through the cover 43 from the outside, and the nut 442 is screwed into a penetrating end of the bolt 441, Further, the bolts 441 are prevented from escaping from the cover 43 by tightening from the inner surface of the cover 43, and the bolts 441 are further screwed into the screw holes 421 previously formed in the end face of the fixed rod 42, thereby The cover 43 is fixed to the fixed rod 42. The first connecting device is not limited to a combination of a bolt and a nut, but may be a removable or non-removable component such as a rivet or a pin. In order to prevent the lower step portion of the cover 43 from wobbling, the second connecting device 45 may be installed by opening a blind hole 312 in the second end surface of the rotary pivot 31. The second connecting device 45 includes a bolt 451 and a nut 452, the bolt 451 passes through the cover 43 from the outside, the nut 452 is screwed into the penetrating end of the bolt 451, and the end of the bolt 451 is the blind hole. 312 is entered and the lower half of the cover is thus positioned. However, the inner diameter of the bolt 451 is slightly smaller than the inner diameter of the blind hole 312 and does not contact the inner wall of the blind hole 312, thereby not affecting the rotational operation of the rotary pivot 31. The second connecting device is not limited to a combination of a bolt and a nut, and is a removable or non-removable part such as a rivet or a pin. FIG. 3 is a front view after folding of the folding chair using the present invention. The entire automatic folding device 4 is installed on the outer side surface of the forefoot frame 2, so that the folding operation of the rear foot frame 5 to the inner position of the front foot frame 2 is not affected during folding, and the seat 1 rotates. Does not affect.

  4 and 5 are operation diagrams of a preferred embodiment of a seat automatic folding apparatus for a folding chair according to the present invention, in which the cover is omitted. When the user sits on the seat 1, the disassembly operation of the automatic folding device is as follows. When the seat 1 receives downward pressure, the connecting plate 32 drives the rotary pivot 31 to rotate in a predetermined direction, and the first end 411 of the spiral spring 41 rotates thereby to generate a tension action. When the second end 412 of 41 first presses against the point A of the fixed rod 42 and the sheet is subsequently pushed down, the first end 411 of the spiral spring 41 is elastically contracted in the radial direction as the rotary pivot 31 rotates. When the deformation is started and the seat 1 is completely unfolded and flattened on both end faces of the rear foot frame 5, the elastic deformation operation is stopped. When the user leaves the seat 1, the pressure on the seat 1 is released, and the rotational pivot 31 is driven in the opposite direction by the elastic recovery force of the spiral spring 41 to rotate, so that the connecting plate 32 and the rotational pivot 31 rotate simultaneously. Thus, when the sheet 1 automatically rotates upward, the second end of the spiral spring 41 leaves the point A of the fixed rod 42 and contacts the point B of the fixed rod 42, the spiral spring 41 recovers. Completed and the seat 1 does not continue to rotate backward because it receives no further force. There is a relative relationship between the opening position of the split groove 311 and the torque of the spiral spring 41. From an empirical rule, the spiral spring 41 is positioned at the position of the split groove 311 as shown in this embodiment diagram. 1 is driven to rotate upward about 70 degrees. This not only achieves the transfer function, but also prevents excessive rotation of the seat 1, and the rotation speed is too high, colliding with the seat stopper installed on the folding chair, damaging the folding chair and generating noise. Is prevented.

  The foregoing description is of the preferred embodiment of the present invention and is not intended to impose a formal limitation on the present invention. Therefore, any modifications or changes that may be made to the present invention under the same creative spirit , All belong to the scope of the claims claiming protection of the present invention.

DESCRIPTION OF SYMBOLS 1 Seat 11 Frame 2 Forefoot frame 21 Groove 3 Pivoting part 31 Rotating pivot 311 Split groove 312 Blind hole 32 Connecting plate 321 Fixing hole 4 Automatic folding device 41 Vortex spring 411 First end 412 Second end 42 Fixing rod 421 Screw hole 43 Cover 44 First connecting device 441 Bolt 442 Nut 45 Second connecting device 451 Bolt 452 Nut 46 Reinforcement block 5 Rear foot frame

Claims (3)

  An automatic folding device provided between a seat frame and a forefoot frame of a folding chair, the automatic folding device including a rotary pivot, a fixed rod, and a spiral spring, the rotary pivot having two opposite ends, The first end penetrates the forefoot frame laterally and can be interlocked with a connecting plate connected to the seat frame, and the second end is a cylindrical end exposed on the surface of the forefoot frame, A fixed rod is vertically installed on the surface of the forefoot frame adjacent to the second end of the pivot, and the first end of the spiral spring is fitted to the second end of the pivot, the spiral spring The second end of the spiral rod surrounds the periphery of the fixed rod, and when the user sits on the seat, the rotation pivot is driven to rotate in a predetermined direction, and the second end of the spiral spring is the fixed rod. Which causes the spiral spring to contract When tension is created and the user leaves the seat, the spiral spring releases the tension and drives the pivot to rotate in a different direction, automatically rotating the seat into a folded state An automatic folding device for a folding chair.   2. The automatic folding device for a folding chair according to claim 1, wherein the automatic folding device further includes a cover that covers the entire automatic folding device, and a first connecting device that fixes the cover to the fixing rod. An automatic folding device for folding chair seats.   The automatic folding device for a folding chair according to claim 1 or 2, further comprising a reinforcement block, wherein the reinforcement block is installed in the groove of the forefoot frame, and the fixing rod is installed perpendicular to the reinforcement block, The automatic folding device for a seat of a folding chair, wherein the first end of the rotary pivot penetrates the reinforcing block laterally.

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