JP5117736B2 - Rotating table for chair with position return function - Google Patents

Description

  The present invention relates to a rotary table that can be attached to a chair or the like, and more particularly to an easy-to-use rotary table that automatically returns to its original position even when the table is rotated.

  As a rotary table and a folding table that can be attached to a chair or the like, for example, there are those described in the following patent documents.

JP-A-9-248227 JP-A-9-117350 JP 2002-209670 A No. 8-10293

  A table that can be attached to a chair or the like does not get in the way when sitting or leaving, and must be easy to use when used. In the former, the table is preferably outside the chair, and in the latter, the table is preferably on the chair (in front of the occupant's chest). For this reason, many of these types of tables are movable, and many are designed to fold when not in use.

  However, even if the table is movable, it has been troublesome for the person to pull out and store the table. Even if it is necessary to move the table when sitting or leaving, it is very convenient if it automatically returns to use. However, there is no table having such a function.

  This invention is made | formed in view of the said subject, and it aims at providing the rotary table for chairs with a position return function which returns to a use state automatically.

A rotary table for a chair with a position return function according to the present invention is:
With the top plate,
A column that supports the top plate at a position away from the center of the top plate and is held rotatably.
A first guide member provided at an end of the support column and having a bearing portion therein;
A second guide member including a shaft that fits into the bearing portion of the first guide member,
A spiral sliding surface is provided around the shaft of the second guide member,
A convex portion that slides on the spiral sliding surface of the second guide member is provided on at least a part of the periphery of the bearing portion of the first guide member.
The functions of the bearing portion and the shaft can be realized by a pipe or the like that holds the support column and the second guide member. A mechanism / mechanism for guiding the spiral sliding surface of the second guide member so that the convex portion of the first guide member slides corresponds to the bearing portion and the shaft. For example, the fact that the first guide member and the second guide member are disposed in the same pipe corresponds to the bearing portion and the shaft.

A rotary table for a chair with a position return function according to the present invention is:
With the top plate,
A column that supports the top plate at a position away from the center of the top plate and is held rotatably.
A second guide member provided at an end of the support column and including a shaft at the center;
A first guide member provided with a bearing portion that receives the shaft of the second guide member,
A spiral sliding surface is provided around the shaft of the second guide member,
A convex portion that slides on the spiral sliding surface of the second guide member is provided on at least a part of the periphery of the bearing portion of the first guide member.
In addition, the function of the bearing portion and the shaft can be realized by a pipe or the like that holds the support column and the first guide member. A mechanism / mechanism for guiding the spiral sliding surface of the second guide member so that the convex portion of the first guide member slides corresponds to the bearing portion and the shaft. For example, the fact that the first guide member and the second guide member are disposed in the same pipe corresponds to the bearing portion and the shaft.

  A plurality of the spiral sliding surfaces of the second guide member may be provided symmetrically.

A plurality of spiral sliding surfaces are provided symmetrically around the bearing portion of the first guide member, and a protrusion is provided at an intersection of the plurality of spiral sliding surfaces,
A recess that fits with the protrusion may be provided at an intersection of the plurality of spiral sliding surfaces of the second guide member.

  A bush may be provided between the top plate and the end of the support, and the support may be rotatably held therein, and a tapered portion may be provided at the end of the bush.

  Hereinafter, embodiments of the invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a rotary table with a position return function according to an embodiment of the invention. The rotary table is attached to an armrest or the like of a chair, but the display thereof is omitted in FIG.

The top plate 1 functions as a table and has a disk shape.
A column 2 is attached to a top plate (disk) 1. Since the mounting position is a position considerably away from the center of the top plate (disk) 1, the top plate 1 moves eccentrically as the support column 2 rotates. That is, the position of the top plate 1 changes according to the rotation position of the support 2. For example, assuming that the support column 1 is provided on an armrest portion of a chair (not shown), the support plate 2 rotates, so that the top plate 1 projects on the chair or is positioned outside the armrest. be able to.

  The column 2 is a columnar or cylindrical member that supports the top plate 1. The support | pillar 2 is rotatably hold | maintained by making the center into a rotating shaft.

  The bush 3 is a bush (cylindrical component that fits in the inner surface of the hole) that holds the column 2 in a rotatable manner. The bush 3 is attached to a cylinder (such as a pipe) (not shown) provided in the armrest portion of the chair or a columnar opening formed in the armrest portion of the chair. The bush 3 is fixed to the armrest of the chair, but since the column 2 is rotatably held therein, the column 3 rotates and the position of the top plate 1 with respect to the armrest of the chair changes. . By fixing the bush 3 to the mouth of a pipe, which is a structural material to be fixed, it is possible to suppress left and right deflection of the top plate 1 (the top plate 1 can only rotate around the support column 2).

  FIG. 2 shows a perspective view of the bush 3. The figure shows a state in which the bush 3 is removed and its top and bottom are reversed. The bush 3 is a resin part, for example. A donut-shaped ridge 31 is provided at one end of the bush 3. The hook 31 is positioned at the mouth of a pipe or the like. A claw 32 is provided at the opposite end. The nail | claw 32 is a processus | protrusion, and is provided in two places symmetrically (FIG. 2 shows one of them). The bush 3 is fixed to the pipe or the like by fitting the claw 32 into an opening (not shown) provided in the pipe or the like that is a structural material to be fixed. Further, four notch portions 33 are provided. The notch 33 has a slit shape, and the thickness of that portion becomes thinner toward the end. If the vicinity of the notch 33 of the bush 3 is cut by a plane parallel to the axis, the cross section has a taper shape that becomes thinner toward the end. In FIG. 2, this portion is shown as a tapered portion 34.

  Returning to FIG. The guide A (4) is a columnar member made of resin that is attached to the column 2 (bolted at one end thereof). The guide A (4) is fixed to the support column 2 and rotates together therewith.

  The guide B (5) is a resin-made columnar member that is attached to a cylinder (not shown) provided in the armrest portion of the chair or a columnar opening formed in the armrest portion of the chair, like the bush 3. The guide B (5) is in contact with the guide A (4) at one end thereof.

  The end surfaces of the guide A (4) and the guide B (5) each have a predetermined spiral shape, and when the guide A (4) and the guide B (5) are in a predetermined positional relationship (rotational position), The end faces touch each other closely and are stable. When leaving the predetermined positional relationship (rotation position), for example, when the column 2 is rotated by a person turning the top plate 1 or the like, the guide A (4) is rotated accordingly, and the spiral surface is the guide B. Go up the same side of (5). When the hand is released from the top plate 1, the spiral surface of the guide A (4) slides down on the same surface of the guide B (5) by its own weight and stops at the predetermined positional relationship (rotational position). As a result, the rotary table of FIG. 1 can be rotated to an arbitrary position by turning it by hand, and has an automatic return function of automatically returning to the original position after releasing the hand. It is.

  FIG. 3 is a perspective view of the guide A (4). The figure shows a state in which the guide A (4) is removed and its top and bottom are placed upside down. Spiral surfaces 41a and 41b are provided at one end of the guide A (4). A spiral is a spiral or spiral, but the spiral surface shown in FIGS. 3 and 4 is a part of the spiral cut out (corresponding to the center angle of the spiral of 180 degrees) and is completely It is not a spiral. The spiral surfaces 41a and 41b are provided symmetrically with respect to a plane passing through the central axis of the guide A (4). These are so-called slopes along the circumference constituting the cylinder of the guide A (4), one being high and the other being low. A protrusion 42 is provided at the higher vertex. At the center of the guide A (4), a bearing portion (cylindrical hole) 43 for receiving a central axis of a guide B (5) described later is provided. The bearing portion 43 does not penetrate. A concave column holding hole 44 for holding the column 2 is provided at the other end of the guide A (4). A bolt hole 45 for fixing the guide A (4) to the column 2 is formed between the column holding hole 44 and the shaft hole 43. Moreover, the other end (rear part 46) of the guide A (4) is narrowed, and its diameter is slightly reduced. When the top plate 1 is pulled up, the rear portion 46 is fitted into the tapered portion 34 of the bush 3, so that the claw 32 is spread and the bush 3 is prevented from being removed from the pipe or the like (described later).

  FIG. 4 shows a perspective view of the guide B (4). The figure shows a state where the guide B (5) is removed. Unlike FIG.2 and FIG.3, the top and bottom is the same as an attachment state. Spiral surfaces 51a and 51b are provided along the circumference of the guide B (5). The spiral surfaces 51a and 51b are so-called slopes provided symmetrically, and correspond to the spiral surfaces 41a and 41b of the guide A (3) (with respect to the examples of FIGS. 3 and 4). In a predetermined positional relationship (rotational position), the spiral surfaces 41a and 51a are in close contact (the same applies to 41b and 51b). A recess 52 is provided at the lowest point where the spiral surfaces 51a and 51b intersect. In the predetermined positional relationship (rotational position), the protrusion 42 of the guide A (4) is fitted into the recess 52. 53 is a central axis of the guide B (4). Spiral surfaces 51 a and 51 b are provided so as to surround the central axis 53. A plurality of slits (elongated shallow grooves) 54 are provided at the tip of the central shaft 53 along the axial direction. This is for holding grease for lubrication. On the lower circumference of the guide A (4), a plurality of convex portions (elongated projections) 55 are provided along the axial direction thereof. This is to prevent the guide A (4) from rotating when attached to a pipe or the like. Moreover, the attachment hole 56 which penetrates the diameter of guide A (4) is provided. By passing a bolt through this hole, the guide A (4) can be attached to a pipe or the like and its rotation can be stopped.

  FIG. 5 is a cross-sectional view of the support 2, the bush 3, the guide A (4), and the guide B (5) cut along a plane passing through the central axis of the support 2. A top plate 1 is provided on the left side of the figure. In the figure, 6 is a bolt for fixing the guide A (4) to the column 2, and P is a pipe. The figure shows a state in which the top plate 1 is rotated by 180 degrees from a predetermined position, and the protrusion 42 of the guide A (2) is positioned on the top of the spiral surfaces 51a and 51b of the guide B (5). . In this state, a gap that does not reach the central shaft 53 is generated in the shaft hole 43.

  With reference to FIG. 6, the operation of the mechanism according to the embodiment of the invention will be described. 6A shows a state in which the top board 1 has been rotated by 180 degrees from a predetermined position (corresponding to FIG. 5), FIG. 6B shows a state in which it has returned halfway (on the way), and FIG. It returns to the position and shows a stable state.

  As shown in FIG. 6 (a), the top plate 1 is rotated by 180 degrees from a predetermined position by a human hand, and the protrusion 42 of the guide A (4) becomes the spiral surfaces 51a and 51b of the guide B (5). Suppose it is located on the top of Since the spiral surfaces 51a and 51b are symmetrically provided, the state shown in FIG. 6A is obtained even if the top plate 1 is rotated 180 degrees in either direction. At this time, since the protrusion 42 goes up the spiral surfaces 51a and 51b, the position of the top plate 1 is slightly increased.

  When the hand is released from the top plate 1 in this state, the protrusion 42 slides down the spiral surfaces 51a and 51b by its own weight. FIG. 6B shows a state in the middle of sliding down. Along with this, the guide A (4) and the column 2 rotate. The arrow in FIG. 6 shows this.

  Eventually, as shown in FIG. 6 (c), when the projection 42 reaches the recess 52, it fits into the recess 52, and the movement and rotation of the column 2 stop, and the spiral surfaces 41 and 51 come into close contact with each other. The strut 2 is stable. In this state, the position of the top plate 1 is the lowest.

  As described above, according to the mechanism according to the embodiment of the present invention, the spiral surface 41 is provided on the tip (guide A (4)) of the rotary column 2 of the top plate (rotary table) 1, and the surface is provided on the surface. By receiving the guide A (4) with the guide B (5) having the spiral surface 51 that fits, the top plate 1 is rotated by its own weight regardless of the position at which the top plate 1 is rotated and the top plate 1 is fixed. Return to position. The projection 42 of the guide A (4) is fitted into the concave portion (groove) 52 of the guide B (5) in the state where it is returned to the fixed position, and both are stably locked to some extent.

The guide B (5) is provided with a central shaft 53, which is fitted into the shaft hole 43 of the guide A (4) and rotates around this, so that it is stable without being affected by burrs and beads on the inner wall of the pipe P. The top plate 1 and the support column 2 can be rotated.
Note that the pipe P performs its function even if there is no central shaft and shaft hole, so if there is a spiral slope, the automatic position return function can be achieved.

  A bush 3 is provided to suppress the swing of the support 2. The bush 3 is fixed to the mouth of the pipe P which is a structural material to be fixed.

  A tapered portion 34 that fits with the rear portion 46 of the guide A (4) is provided around the bottom of the bush 3 so that the top plate 1 and the support column 2 are not pulled out carelessly. When the top plate 1 and the support column 2 are pulled up, as shown in FIG. 7, the rear portion 46 of the guide A (4) fits inside the taper portion 34 of the bush 3 and pushes it outward. Then, the claw 32 spreads outward and fits firmly in the hole provided in the pipe P, so that the bush 3 does not come off from the pipe P, and the top plate 1 and the support column 2 are not pulled out from the pipe P. .

  FIG. 8 shows an example of attachment of the rotary table with position return function according to the embodiment of the invention. A column 2 is attached to a hole provided in an armrest of the chair C (although not shown, a bush 3, a guide A (4), and a guide B (5) are also attached). In a normal state (a state where no external force is applied), the top plate 1 is in a position indicated by a solid line. In this state, the top board 1 protrudes from the right half of the chair C, and it is convenient for a person sitting on the chair to place documents or drinks on the top board 1, but when trying to sit on the chair, Get in the way. Therefore, when the top board 1 is turned around the support 2, the top board 1 moves greatly and comes off the chair C (because the support 3 is supported at a position away from the center of the top 1), so that the chair can be easily I can sit down. Then, when the hand is released, the support column 3 is automatically rotated by the action as described above, and the top plate 1 returns to the normal position. Thus, according to the rotary table with a position return function according to the embodiment of the present invention, it is possible to satisfy both convenience during use and ease of use during seating and leaving.

1. Modification of the embodiment of the invention
The guide A (4) in FIG. 3 is provided with the protrusion 42, but it may not have this as shown in FIG. 9, for example. The convex portion generated at the intersection of the spiral surfaces 41 a and 41 b functions in the same manner as the projection 42. Note that the concave portion 52 of the guide B (5) may be eliminated corresponding to FIG.

Modification Example 2 of the Invention
The guide A (4) in FIG. 3 is provided with spiral surfaces 41a and 41b. For example, the guide A (4) may not have the surfaces as shown in FIG. If there is a projection 42 provided on at least a part of the circumference of the guide A (4) in parallel to the central axis, the above-described combination with the guide B (5) of FIG. Can serve the same function. In this case, the spiral surfaces 41a and 41b are unnecessary.

Modification Example 3 of the Invention
The guide B (5) in FIG. 4 is provided with two spiral surfaces 51a and 51b symmetrically. However, for example, the spiral surface 51 may be one as shown in FIG. The spiral angle in FIG. 11 is about 360 degrees. The combination of the guide B (5) in FIG. 11 and the guide A (4) in FIG. 10, for example, can achieve the same function as described above. However, in the structure of FIG. 11, the rotation direction of the column 2 is limited to one side (in the structure of FIG. 4, it can be rotated to the left or right). Further, it is preferable to provide a stopper mechanism that prevents the support column 2 from rotating 360 degrees or more, for example, so that the protrusion 42 of the guide A (4) does not come off from the spiral surface 51.

  In the above description, the guide A (4) is fixed to the column and the guide B (5) is fixed inside the pipe. Conversely, the guide B (5) is fixed to the column and the guide A ( 4) may be fixed inside the pipe, and the same effect is produced.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

It is a perspective view of a rotary table with a position return function according to an embodiment of the invention. It is a perspective view of a bush concerning an embodiment of the invention. It is a perspective view of guide A concerning an embodiment of the invention. It is a perspective view of guide B concerning an embodiment of the invention. It is sectional drawing of the mechanism which concerns on embodiment of invention. It is explanatory drawing of the effect | action of the mechanism which concerns on embodiment of invention (perspective view). It is sectional drawing of the mechanism which concerns on embodiment of invention (description figure of retaining). It is explanatory drawing of the use condition of the rotary table with a position return function which concerns on embodiment of invention. It is a perspective view of the guide A which concerns on the modification 1 of embodiment of invention. It is a perspective view of the guide A which concerns on the modification 2 of embodiment of invention. It is a perspective view of the guide B which concerns on the modification 3 of embodiment of invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top plate 2 Support | pillar 3 Bush 31 鍔 32 Claw 33 Notch part 34 Tapered part 4 Guide A (1st guide member)
41a, 41b Spiral surface 42 Projection (convex part)
43 Bearing (shaft hole)
5 Guide B (second guide member)
51a, 51b Spiral surface 52 Concave portion 53 Central axis 54 Slit 55 Convex portion 56 Mounting hole C Chair P Pipe

Claims (5)

With the top plate,
A column that supports the top plate at a position away from the center of the top plate and is held rotatably.
A first guide member provided at an end of the support column and having a bearing portion therein;
A second guide member including a shaft that fits into the bearing portion of the first guide member,
A plurality of spiral sliding surfaces are provided symmetrically around at least the shaft of the second guide member,
A position return function characterized in that a convex portion that slides on the spiral sliding surface of the second guide member is provided on at least a part of the periphery of the bearing portion of the first guide member. Rotating table for chair. With the top plate,
A column that supports the top plate at a position away from the center of the top plate and is held rotatably.
A second guide member provided at an end of the support column and including a shaft at the center;
A first guide member provided with a bearing portion that receives the shaft of the second guide member,
A plurality of spiral sliding surfaces are provided symmetrically around at least the shaft of the second guide member,
A position return function characterized in that a convex portion that slides on the spiral sliding surface of the second guide member is provided on at least a part of the periphery of the bearing portion of the first guide member. Rotating table for chair. A plurality of spiral sliding surfaces are provided symmetrically around the bearing portion of the first guide member, and a protrusion is provided at an intersection of the plurality of spiral sliding surfaces,
3. The position return according to claim 1 , wherein a recess that fits with the protrusion is provided at an intersection of the plurality of spiral sliding surfaces of the second guide member. A rotating table for chairs with functions. A bush provided between the top plate and the first guide member and rotatably supporting the column within the top plate; and a bush provided with a tapered portion at an end on the first guide member side ;
The bush is provided in a cylindrical or columnar opening,
When the top plate is pulled up, the end of the first guide member fits into the tapered portion and spreads to the inner surface of the cylindrical or columnar opening, and the bush extends from the cylindrical or columnar opening. 2. The rotary table for a chair with a position return function according to claim 1, wherein the rotary table is configured not to come off . A bush provided between the top plate and the second guide member and rotatably holding the support column therein; and a bush provided with a tapered portion at an end on the second guide member side;
  The bush is provided in a cylindrical or columnar opening,
  When the top plate is pulled up, the end of the second guide member fits into the tapered portion and spreads to the inner surface of the cylindrical or columnar opening, and the bush extends from the cylindrical or columnar opening. The rotary table for a chair with a position return function according to claim 2, wherein the rotary table is configured so as not to come off.

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