JP4296220B2 - Lecture chair - Google Patents

Description

  The present invention relates to a lecture chair mainly used in a lecture room of a university, and more particularly to a lecture chair that can be placed in a retracted state by tilting its backrest when not in use.

  Many desks and chairs used in classrooms and classrooms such as schools are fixed on the floor and arranged in parallel.

  For this reason, such a chair for lectures has a structure that can be moved forward and stored under the desk when not in use in order to improve usability. And the space for a person to move is provided in the back surface of a chair.

As a conventional lecture chair structure, a pedestal with a seat plate attached to a base fixed to the floor is rotatably attached (Patent Document 1), or fixed to the floor surface. There is a pedestal in which a seat plate is slidably mounted back and forth (Patent Document 2).
JP 2006-122460 A Utility model registration No. 3016453

In the chair of the first type described above, the pedestal pivots around the mounting portion with the base, so that in use, all the weight applied to the chair is applied to this fulcrum. For this reason, there is a problem that the structure of the mounting portion is complicated and the cost tends to be high.

  In addition, since the pedestal is used in a state where it is rotated and tilted to the rear side during use, the rigidity of the chair in use is insufficient compared to an ordinary chair, and there is also a problem that it lacks a sense of stability. there were.

  The second type of chair described above has a problem that it is difficult to secure a sufficient space on the back surface because a sufficient amount of sliding for the seat plate to move back and forth cannot be obtained structurally.

  Therefore, the present invention provides a lecture chair that solves the above-described problems, rotates the chair pillar with a simple structure, has sufficient strength during use, and has high stability. With the goal.

  The lecture chair of the present invention includes a cylindrical pedestal fixed to the floor, a rotating leg rotatably mounted inside the pedestal, and a seat fixed to the upper part of the rotating leg. A backrest coupled to the seat plate, and elastically rotating the rotating leg forward by an urging force within the pedestal and about an axis provided below the pedestal The pivot leg is rotated forward by the biasing force of the elastic means when not in use, and is brought into contact with the front side of the leg pillar. Sometimes, the seat plate is pivoted to the rear side inside the pedestal column against the urging force of the elastic means and is brought into contact with the rear side inside the pedestal column. It moves back and forth while in contact with the upper end of the pedestal.

  And it is preferable that a buffer part is provided on the front side of the rotating leg, and the buffer part comes into contact with the inside of the pedestal column when the rotating leg contacts the front side inside the pedestal column.

  The backrest is preferably substantially vertical when not in use.

The elastic means is preferably a torsion coil spring provided on the shaft.

  Furthermore, it is preferable to provide a compression spring that acts as a buffer when the rotating leg comes into contact with the front side inside the pedestal, at the rear of the lower end of the rotating leg.

  The lecture chair of the present invention includes a cylindrical pedestal fixed to the floor, a rotating leg rotatably mounted inside the pedestal, and a seat fixed to the upper part of the rotating leg. A backrest coupled to the seat plate, and elastically rotating the rotating leg forward by an urging force within the pedestal and about an axis provided below the pedestal The pivot leg is rotated forward by the biasing force of the elastic means when not in use, and is brought into contact with the front side of the leg pillar. Sometimes, the seat plate is pivoted to the rear side inside the pedestal column against the urging force of the elastic means and is brought into contact with the rear side inside the pedestal column. By moving back and forth while in contact with the upper end of the pedestal, it is stronger and simpler than before and has sufficient strength and safety during use. Sex high lecture chair is possible.

  Then, a buffer portion is provided on the front side of the pivot leg, and when the pivot leg comes into contact with the front side inside the pedestal, the cushion portion comes into contact with the inside of the pedestal, thereby ending use of the chair. When it is not in use, it can reduce the impact when the rotating leg comes into contact with the inside of the pedestal, reduce unpleasant collision noise caused by collision, and reduce fatigue of members caused by repeated use It becomes possible.

  Further, since the backrest is substantially vertical when not in use, it is possible to secure a wide space on the back of the chair when the chair is not used, and the passage of people becomes smooth.

And since the said elastic means is the torsion coil spring provided in the said axis | shaft, the said rotation leg can be rotated smoothly.

  Furthermore, when the rotating leg contacts the front side inside the pedestal, a compression spring that acts as a buffer is provided on the rear side of the lower end of the rotating leg, so that the rotating leg is located inside the pedestal. The impact when contacting the front side can be suppressed.

  An embodiment of a lecture chair according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of the lecture chair 1 of the first embodiment, and FIG. 2 is a cross-sectional view.

  A lecture chair 1 according to the first embodiment includes a cylindrical pedestal 2 fixed to a floor surface, a turning leg 3 rotatably attached to the inside of the pedestal 2, and the turning leg. 3 is composed of a seat plate 4 fixed to the upper portion of 3 and a backrest 5 coupled to the seat plate 4.

  The pedestal 2 has a cylindrical shape with a rectangular cross section, and has a shape in which the upper side is widened when viewed from the side, and a collar portion 9 for fixing the pedestal 2 to the floor is provided on the lower side. .

As a method of fixing the lecture chair 1 of the present invention to the floor surface, in this embodiment, the collar portion 9 is fixed to the floor using the anchor 12 (see FIG. 4). At this time, in this embodiment, the anchor 12 is fixed using four places.

  The seat plate 4 is fixed to the upper part of the rotating leg 3 so as to be horizontal when the lecture chair 1 is used. The seat plate 4 and the backrest 5 are fixed at a predetermined angle.

And the elastic means 6 which always rotates the said rotation leg 3 to the front side with the urging | biasing force within the said pedestal 2 is provided, and the said axis | shaft 7 attached to the lower side of the said pedestal 2 in this embodiment. The rotating leg 3 is rotatably mounted, and the rotating leg 3 is constantly rotated forward in the pedestal column by the urging force of the torsion coil spring 8 wound around the shaft 7. is working.

Thus, by the urging force of the elastic means 6, when the lecture chair 1 is not used, the rotating leg 3 is rotated to the front side inside the pedestal 2 and is brought into contact with the front side inside the pedestal 2, In use, a force against the urging force of the elastic means 6 works when a person sits on the seat plate 4, and the rotating leg 3 is rotated rearward inside the pedestal 2, so that The state is brought into contact with the rear side. The rotating leg 3 which is such a movable member is rotated inside the pedestal 2, and unlike the conventional chair, the movable member is configured not to be visible from the outside.

At this time, the inclination angle of the front upper part of the pedestal 2 is the same as the angle when the rotating leg 3 is rotated forward, and the rotating leg 3 is supported on the front of the pedestal 2. . The inclination angle of the upper rear surface of the pedestal 2 is the same as the angle when the rotating leg 3 is rotated rearward, and the rotating leg 3 is supported by the rear surface of the pedestal 2. .

And when the said rotation leg 3 rotates back and forth, the said seat board 4 is comprised so that it may move back and forth in the state which contact | connected the upper end of the said pillar 2. For these reasons, in the state of use of the lecture chair 1 of the present invention, the seat plate 4 is supported by the pedestal 2 and the load applied when a person sits on the seat plate 4 is mainly the pedestal 2. It is the structure supported by. Further, the rotating leg 3 is held in contact with the rear surface of the pedestal 2 during use, and is configured so that most of the load applied to the rotating leg 3 is applied to the pedestal 2.

  As a result, since the load is not applied to the rotating leg 3 which is a movable member, no extra force is applied to the portion where the rotating leg 3 is attached to the pedestal 2, and the rotating member is simpler than before. A structure that does not require much strength is possible.

  Furthermore, since the pedestal 2 fixed to the floor surface can hold most of the load during use, a sufficient sense of stability can be maintained during use.

  In the present embodiment, buffer portions 10 are provided at two locations on the front surface of the rotating leg 3. The buffer 10 is configured to relieve an impact by the buffer 10 coming into contact with the pedestal 2 when the rotary leg 3 is rotated forward and comes into contact with the front surface of the pedestal 2. Yes. For this reason, elastic rubber or resin is used. The number is not particularly limited, and may be other than two.

  In particular, when the lecture chair 1 is used up, the rotating leg 3 is automatically rotated forward by the urging force of the elastic means 6 and collides with the upper front surface of the pedestal 2. Can be relaxed by the buffer 10.

  When the lecture chair 1 of the present invention is used, the pivot leg 3 is pivoted rearward and the seat plate 4 is in a horizontal state, and when not in use, the pivot leg 3 is pivoted forward and the back surface is used. However, it is preferable that the backrest 5 is substantially vertical at this time.

  With the backrest 5 having such a configuration, as shown in FIG. 3, in this embodiment, the backrest 5 is moved to the front of the pedestal 2 when not in use and is forward of the rear surface of the pedestal 2. Therefore, the space behind the pedestal 2 can be used as a passage.

  As a result, the lecture chair 1 according to the present invention can secure a sufficient space when not in use.

  Further, a cover 11 is provided at the base of the lecture chair 1 of the present invention so as to protect the protrusions such as the anchor 12 for fixing. By using the cover in this way, it is possible to ensure the safety of the feet during use.

  Next, a lecture chair 1 ′ according to the second embodiment will be described with reference to the drawings. FIG. 6 is a cross-sectional view of the lecture chair 1 ′ according to the second embodiment.

  The lecture chair 1 ′ according to the second embodiment, like the lecture chair 1 according to the first embodiment, rotates in a cylindrical pedestal 2 fixed to the floor and inside the pedestal 2. The pivot leg 3 is movably attached, the seat plate 4 is fixed to the upper part of the pivot leg 3, and the back 5 is coupled to the seat plate 4. The pivot leg 3 is connected to the leg column. 2 is provided with elastic means 6 that is always rotated forward by an urging force in the interior. The elastic means 6 has a structure using a torsion coil spring 8.

In the present embodiment, a compression spring 13 that functions as a buffer when the rotating leg 3 comes into contact with the front side inside the pedestal 2 is disposed behind the lower end of the rotating leg 3. The compression spring 13 is held by a shaft 14 and acts on the lower end of the rotating leg 3. The shaft 14 is threaded and fixed to the front side of the pedestal 2 using a double nut. By using such a structure, the length of the shaft 14 inside the pedestal 2 can be changed. Thereby, the force which the said compression spring 13 acts on the lower end of the said rotation leg 3 can be adjusted.

A cap 16 and a plate 15 having a curved surface are provided at the tip of the compression spring 13 so that the compression spring 13 can move smoothly when the compression spring 13 comes into contact with the rotating leg 3 to apply a spring force.

The other structures of the lecture chair 1 ′ of the present embodiment, for example, the cover 11 and the like are the same as those of the first embodiment, but are not particularly limited thereto.

How the compression spring 13 acts on the rotating leg 3 will be described in detail. FIG. 7 is an enlarged sectional view of the lower end portion of the lecture chair 1 ′ when not in use, and FIG. 8 is an enlarged sectional view of the lower end portion of the lecture chair 1 ′ when in use.

As shown in FIG. 7, when not in use, the urging force of the torsion coil spring 8 which is the elastic means 6 causes the rotating leg 3 to be rotated forward in the pedestal 2 so that the inside of the pedestal 2 It is in the state contacted to the front side. At this time, the compression spring 13 is in a contracted state and acts on the lower end of the rotating leg 3 to push the lower end of the rotating leg 3 forward, but the torsion coil is driven by the spring force of the compression spring 13. By increasing the spring force of the spring 8, the compression spring 13 prevents the upper end of the rotating leg 3 from rotating backward.

Next, the usage will be described. As shown in FIG. 8, when a person sits on the seat plate 4, the pivot leg 3 is pivoted rearward so that the seat plate 4 becomes horizontal and is in use. At this time, the seat plate 4 moves rearward while in contact with the upper end of the pedestal 2. In use, the seat plate 4 is supported by the pedestal 2, and the load applied when a person sits on the seat plate 4 is mainly held in contact with the rear surface of the pedestal 2.

The state of the compression spring 13 at this time is a state where it does not act on the rotating leg 3. Therefore, in use, the compression spring 13 may not be in contact with the rotating leg 3 in particular.

Next, the case where the state changes from the time of use to the time of non-use will be described. When the load of the person sitting on the seat plate 4 disappears from the state of FIG. 8, the upper end of the rotating leg 3 is rotated forward about the shaft 7 by the spring force of the torsion coil spring 8. However, it tries to come into contact with the front side inside the pedestal 2.

At this time, the compression spring 13 which has not been operated at the time of use is pushed backward by the lower end of the pivot leg 3 pivoting backward, so that the pivot leg 3 rotates. A spring force acts in the opposite direction. Since the spring force of the compression spring 13 is smaller than the spring force of the torsion coil spring 8, the rotating leg 3 is not rotated in the opposite direction, but the rotating speed of the rotating leg 3 is reduced. The rotating leg 3 functions to suppress an impact when it comes into contact with the front side inside the pedestal 2.

Thus, by using the compression spring 13, the impact when the rotating leg 3 comes into contact with the pedestal can be reduced.

  As described above, the lecture chair according to the present invention has a simpler structure than the conventional one, can improve the stability during use, and can sufficiently secure the passage space when not in use. .

A side view of a lecture chair of a 1st embodiment. Sectional drawing of the lecture chair of 1st Embodiment at the time of use. Sectional drawing of the chair for lectures of 1st Embodiment at the time of non-use. AA sectional drawing of FIG. The front view of the chair for lectures of 1st Embodiment. Sectional drawing of the chair for lectures of 2nd Embodiment. The partial expanded sectional view which shows the state at the time of non-use of the lecture chair of 2nd Embodiment. The partial expanded sectional view which shows the state at the time of use of the lecture chair of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1 'Lecture chair 2 Pillar 3 Rotating leg 4 Seat plate 5 Backrest 6 Elastic means 7 Axis 8 Torsion coil spring 9 Brim part 10 Buffer part 11 Cover 12 Anchor 13 Compression spring 14 Axis 15 Plate 16 Cap

Claims (5)

A cylindrical pedestal fixed to the floor surface, a rotating leg mounted rotatably inside the pedestal, a seat plate fixed to the upper part of the rotating leg, and coupled to the seat plate Made of backrest,
Elastic means for rotating the rotating leg around the axis provided on the lower side of the pedestal, always on the front side by an urging force in the pedestal;
When not in use, the pivot leg is pivoted forward about the axis inside the pedestal by the biasing force of the elastic means, and is in contact with the front side inside the pedestal,
In use, the rotating leg is rotated rearward about the axis inside the leg column against the urging force of the elastic means and is brought into contact with the rear side inside the leg column. A special lecture chair.

  2. The shock absorber according to claim 1, wherein a buffer portion is provided on a front side of the rotating leg, and the buffer portion contacts the inside of the pedestal column when the rotating leg contacts a front side inside the pedestal column. Lecture chair.   The lecture chair according to claim 1 or 2, wherein the backrest is substantially vertical when not in use.   The lecture chair according to any one of claims 1 to 3, wherein the elastic means is a torsion coil spring provided on the shaft. 5. The compression spring according to claim 1, further comprising a compression spring that acts as a buffer when the rotating leg comes into contact with the front side of the pedestal. The listed lecture chair.

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