JPH0450841Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a chair in which the elastic resistance of the backrest plate to tilt backward is automatically adjusted according to the weight of a seated person.

[Conventional technology]

In conventional chairs, the backrest plate is connected to the upper end of the backrest rod, which is pivoted to the underside of the seat, and the backrest plate is always tilted forward in order to support the seated person's backward tilt. is elastically biased by a coil spring, and the strength of the spring is adjusted depending on the seated person. However, if the weight difference between the seated persons is large, the tilting angle of the backrest plate will vary greatly. It was necessary to adjust the strength of the spring each time, which was a problem when used by an unspecified number of people. In addition, chairs that have an elastic body embedded inside the backrest rod or seat that elastically supports the backrest plate are adjusted to standard specifications when shipped from the factory, and it is impossible for the seater to adjust them from the outside. It still had the problems mentioned above. Therefore, the elastic resistance of the backrest plate to the backward tilt changes depending on the weight of the seated person.In other words, the resistance to the back tilt is large for a heavy seated person, and There was a desire for a chair that would be smaller.

[The problem that the idea aims to solve]

In view of the above-mentioned situation, the present invention aims to solve the problem of a chair in which the elastic resistance against the backward tilting of the backrest plate automatically changes according to the weight of the seated person, so that the seated person can be seated in a stable manner at all times. The point is to provide the following.

[Means to solve the problem]

In order to solve the above-mentioned problem, the present invention has been developed to attach a backrest rod to a support plate extending upward at the rear end of both side plates of a frame having an upwardly opening and generally U-shaped cross section that can be attached to a footrest. The frame is further rotatably supported by a fixed support shaft, and the front and rear parts of the frame and the front and rear parts of the seat support positioned on the frame are linked and connected by connecting members inclined rearward, respectively. A guide member having an elongated slide hole in the longitudinal direction is fixed to the center of the frame, and a pin protruding from the movable member is inserted into the elongated slide hole to enable movement in the longitudinal direction. One end of the link member is pivotally supported, the other end is pivotally supported at an appropriate position on the movable member, the base end of a guide rod is pivotally supported on the lower end of the backrest rod, and the tip thereof passes through the movable member in the front-rear direction. A compression coil spring is inserted between the lower end of the backrest rod and the movable member in a compressed state, and the backrest plate is seated on the backrest rod. A seat was attached to the chair.

[Effect]

In the chair of the present invention having the above-mentioned contents, when a seater sits on the seat plate, the seat supports, whose front and rear parts are linked to the front and rear parts of the frame by connecting members tilted rearward, sink backward and downward in a substantially parallel manner. However, at this time, the movable member linked to the front part of the seat plate via the link member moves rearward as the pin slides along the slide elongated hole of the guide member, and thereby the movable member The compression coil spring interposed between the seat and the lower end of the backrest rod is compressed, and the seater comes to rest at a position balanced with the weight of the seated person. When the person leans against the backrest plate in this state, the lower end of the backrest rod rotates forward. The seat moves further to compress the compression coil spring, and comes to rest at a position balanced with the backward tilting force of the seated person. That is,
The elastic resistance of the compression coil spring against the backward tilt of the backrest lever, which is pivotally supported by a fixed support shaft on the support plate at the rear end of the frame, is caused by the movable member that moves rearward according to the weight of the seated person and the lower end of the backrest lever. It is automatically adjusted by changing the distance between the two.

〔Example〕

Next, the present invention will be further explained in detail based on the embodiments shown in the accompanying drawings.

FIG. 1 shows a typical embodiment of the chair of the present invention,
FIG. 2 shows an exploded perspective view of the main parts, and in the figure, 1 is a frame, 2 is a backrest lever, and 3 is a seat support.

The frame 1 consists of an elongated body having a substantially U-shaped cross section and opening upward, and has side plates 4, 4, and is supported at the upper ends of support plates 5, 5 extending upward from the rear ends of the side plates 4, 4. holes 6, 6 are formed, and the both side plates 4,
Support holes 7, 7 are formed in the front part of the support plate 4, and support holes 8, 8 are also formed in the rear part at a position forward of the support plate 5.
Further, the lower surface of the bottom plate 9 or the appropriate positions of the side plates 4, 4 are fixed to the upper end of the leg stand 10.

The backrest rod 2 is made of a long body, and the backrest plate 11 is attached to the upper part by screwing, etc., and penetrates through both sides at a height position with a predetermined length of the lower end 12 remaining from the lower end. Through holes 13, 13 are formed, the lower end portion 12 is positioned between the support plates 5, 5 of the frame 1, and the through hole 13, The lower end portion 12 is rotatably supported through the lower end portion 13 and is formed into a hollow tube.
The front surface is open, and through holes 14, 14 are formed at the lower ends of both side surfaces.

The seat support 3 is an elongated body that is located above the frame 1 or covers the top of the frame 1 and has a substantially U-shaped cross section with a downward opening, and the seat plate 16 is fixed to the top plate 15 with screws. Through holes 18, 18 and through holes 19, 19 are formed in the front and rear parts of both side plates 17, 17, respectively, and a portion of the rear end of the upper plate 15 is cut out so that the upper plate 15 can be mounted equally. An opening 20 is formed into which the support plates 5, 5 of the frame 1 can be inserted loosely and which does not hinder the movement of the backrest rod 2. In this embodiment, the opening 20 is formed at the rear end of the seat support 3 as described above.
It is also possible to have a shape cut at the front edge of 0.

In order to interlock the backrest rod 2 and the seat support 3, first, holes 22, 22 formed at both ends of the connecting member 21 are inserted into the frame 1, respectively.
The fixed support shaft 2 is inserted through and engaged with the support holes 7, 7 in the front part of the
3 and the floating support shaft 24 which is inserted into the through holes 18, 18 in the front part of the seat support 3 and connected thereto, and the holes 26, 26 formed at both ends of the similar connecting member 25 are inserted into the holes 26, 26 formed at both ends of the connecting member 25, respectively. A fixed support shaft 27 inserted through and engaged with the support holes 8 at the rear of the frame 1 and a floating support shaft 28 inserted through and engaged with the through holes 19 at the rear of the seat support 3 are inserted and linked together. Next, elongated sliding holes 31, 31 in the front and rear direction are formed in both side walls 30, 30 standing upwardly of the guide member 29, which has a substantially U-shaped cross section and is fixed to the bottom plate 9 of the frame 1 by screws, welding, etc. A movable member 33 is disposed in the groove 32 open above the guide member 29, and pins 34, 34 protruding from both sides of the movable member 33 are inserted into the slide elongated holes 31, 31. One of the holes 36 formed at both ends of the link member 35 is inserted into the floating support shaft 24 which is inserted into the front part of the seat support 3, and the other is inserted into the movable member 33. It is inserted through the pins 34, 34 of and linked together. Furthermore, the through hole 39 of the connecting tube 38 fixed to the base end of the guide rod 37 with its axis orthogonal is inserted into the floating support shaft 40 which is inserted through and engaged with the through holes 14, 14 at the lower end of the backrest rod 2. and connect the tip with the moving member 3.
A guide hole 41 formed through the center of 3 in the front and back direction.
A compression coil spring 42 is inserted between the connecting pipe 38 and the rear surface of the moving member 33 in a compressed state and wound around the guide rod 37 . Note that the moving member 33
If a concave portion 43 into which the end of the compression coil spring 42 is fitted is formed around the guide hole 41 on the rear surface,
It is more preferable because it can be supported without wobbling. Further, in this embodiment, the guide member 29 is fixed to the frame 1, but it is also possible to directly drill the slide slots 31, 31 in the side plates 4, 4 of the frame 1.

Here, the connecting members 21 and 25 of this embodiment
is made by bending plates of the same shape to face each other in parallel and connecting the upper parts with horizontal pieces.
The present invention is not limited to this, and it is also possible to mold it into a block shape using synthetic resin or the like, in which case the lower central portion of the rear connecting member 25 must be opened in order to allow the compression coil spring 42 to pass through. In addition, pins 34, 34 were provided protruding from both sides of the moving member 33;
It is also possible to allow the support shaft to pass through the support shaft and make both ends protrude. Furthermore, a rear plate 44 is provided between the rear edges of both support plates 5, 5 of the frame 1, so that when the upper part of the backrest rod 2 is tilted most forward, the lower end comes into contact with it and functions as a stopper. ing.

First, in an unloaded state, the lower end of the backrest rod 2 comes into contact with the rear plate 44 of the frame 1 due to the elastic force of the compression coil spring 42, as shown in FIG. The movable member 33 is stopped at that position by the pin 34 coming into contact with the frontmost end of the slide slot 31 of the guide member 29, and the seat support 3 linked to the movable member 33 by the link member 35 is in its highest state. In this state, the floating support shaft 24 is moved backward from the fixed support shaft 23 at the front part, and the floating support shaft 28 is moved from the fixed support shaft 27 at the rear part so that both the connecting members 21 and 25 are tilted rearward. It is positioned at the rear. Next, to explain the operation of each part of the chair of the present invention, when a seated person sits on the seat plate 16, almost the whole weight of the seated person is applied to the seat support 3 via the seat plate 16, and the front and rear parts are moved. The seat support 3, which is linked to the front and rear parts of the frame 1 by connecting members 21 and 25, sinks rearward and downward as the connecting members 21 and 25 rotate rearward, and accordingly, the link member 35
The moving member 33 slides rearward via the
A compression coil spring 42 interposed between the lower end of the backrest rod 2 and the moving member 33 is compressed, and the seat stands still in a state where the weight of the seated person and the elastic repulsive force of the compression coil spring 42 are balanced. In this state, when you lean on the backrest plate 11, the lower end 12 of the backrest rod 2 rotates forward, but the compression coil spring 42 rotates accordingly.
is further compressed, that is, the backrest rod 2 tilts backward against the elastic resistance of the compression coil spring 42.
Therefore, the elastic force of the compression coil spring 42, which provides elastic resistance against the backward tilt of the backrest rod 2, causes the movable member 33 to move rearward due to the weight of the seated person, and as a result, the backrest of the heavy seated person is reduced. The elastic resistance force against the backward tilting of the leaning rod 2 is greater than that of a lighter seated person. Furthermore, when the user leaves the seat, the lower end of the backrest rod 2 is pushed backward by the elastic repulsive force of the compression coil spring 42, and the movable member 33 is pushed back forward, causing the seat support 3 to float forward and upward. Go up and restore to the initial state.

In addition, the mechanism section incorporating the compression coil spring 42 that connects the frame 1, the backrest rod 2, and the seat support 3 of the present invention and elastically biases the upper part of the backrest rod 2 forward is provided in various sizes. If the various mechanical units are manufactured in advance by standard design and shape,
Chairs of various types can be easily realized. That is, as shown in FIG. 3, a rotatable chair can be constructed using the rotatably supported leg pedestal 10 shown as a pedestal, and as shown in FIG. A pipe chair can be constructed by using the pipe chair, which is very convenient for practical use.

[Effect of idea]

According to the chair of the present invention as described above, the backrest rod is pivoted to the support plate extending upwardly at the rear end of the frame with the lower end remaining, and the front and rear of the seat support are attached to the front and rear of the frame. The movable member, which is supported by a guide member fixed to the center of the frame so as to be movable back and forth, and the front part of the seat support are linked by a link member, and the base end is connected to the backrest. Since a compression coil spring is interposed between the lower end of the backrest rod and the moving member in a compressed state, it is wound around a guide rod which is pivotally supported at the lower end of the rod and whose tip is inserted into a guide hole passing through the moving member in the front-rear direction. When a person sits on the seat plate, the connecting member rotates backward, causing the seat plate to sink backward and downward, and the moving member pushed backward through the link member causes the compression coil spring to respond to the weight of the person sitting on the seat. It is possible to change the elastic force of the compression coil spring that can be compressed and thereby provide elastic resistance against backward tilting of the backrest rod, and for a heavy seated person, the elasticity of the compression coil spring can be changed. The elastic resistance against backward tilting can be increased compared to that of a seated person with a light body weight, so even if the weight of the seated person varies greatly, the seated person can always sit stably in a well-balanced state. Unlike when a heavy person is seated on the seat, the backrest plate will not unexpectedly tilt extremely backwards and give the seated person a sense of instability.

In addition, the compression coil spring that provides elastic resistance against backward tilting of the backrest rod has its base end pivoted to the lower end of the backrest rod, and its tip wound around a guide rod that is slidably inserted into the guide hole of the movable member. Since it is interposed between the movable member and the lower end of the backrest rod in the rotated state, there is no risk of it coming off even if the backrest rod is suddenly tilted.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing a typical embodiment of the chair of the present invention, FIG. 2 is an exploded perspective view of the main parts, and FIG. 3 is a perspective view of a rotating chair constructed according to the present invention.
FIG. 4 is a perspective view of the pipe chair as well. 1...Frame, 2...Backrest rod, 3...Seat support, 4...Side plate, 5...Support plate, 6...Support hole,
7...Support hole, 8...Support hole, 9...Bottom plate, 10
... Leg stand, 11 ... Backrest plate, 12 ... Lower end,
13...Through hole, 14...Through hole, 15...Top plate, 1
6...Seat plate, 17...Side plate, 18...Through hole, 19
...Through hole, 20...Opening, 21...Connecting member, 2
2... hole, 23... fixed support shaft, 24... floating support shaft, 25... connection member, 26... hole, 27... fixed support shaft, 28... floating support shaft, 29... guide member,
30...Side wall, 31...Slide slot, 32...
Concave groove, 33... Moving member, 34... Pin, 35...
... Link member, 36 ... Hole, 37 ... Guide rod, 3
8... Connecting pipe, 39... Through hole, 40... Floating support shaft, 41... Guide hole, 42... Compression coil spring,
43... Concave portion, 44... Rear plate.

Claims (1)

[Scope of utility model registration request] The backrest lever is attached to a support plate extending upward at the rear end of both sides of the frame, which has an upwardly opening U-shaped cross section that can be attached to a footrest, and is rotatable on a fixed support shaft with the lower end left open. At the same time, the front and rear of the frame and the front and rear of the seat support positioned on the frame are linked and connected by connecting members tilted rearward, and a long slot for sliding in the front and rear direction is provided in the center of the frame. At the same time, a pin protruding from the movable member is inserted into the slide elongated hole to enable movement in the front and rear direction, and one end of the link member is pivotally supported on the front part of the seat support, and the other end is fixed. The movable member is pivoted at an appropriate position, and the base end of the guide rod is pivoted to the lower end of the backrest rod, and the tip thereof is inserted into a guide hole passing through the movable member in the front-rear direction. A compression coil spring is interposed between the lower end of the backrest rod and the movable member in a rolled and compressed state,
A chair characterized in that a backrest plate is attached to the backrest rod and a seat plate is attached to the seat support.