JP2010220726A - Seat for swing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat for a swing, enough absorbing shock and having high durability. <P>SOLUTION: This seat 1 for a swing includes: a plate-like base 20; a cushion body 30 covering the outer periphery of the base 20; and metal fittings 40. The cushion body 30 is provided with a corner part 31 and a recessed part 32 as shown in (a). The back of the cushion body 30 is provided with a plurality of buffer holes 38 disposed in a line as shown in (d). The buffer holes 38 have various forms of an elongated hole 38a, a circular hole 38b, a triangular hole 38c and a flat hole 38d according to the shape of the cushion body 30. A circular hole 38b is provided in the vicinity of the recessed part 32 to prevent deterioration due to load applied to the recessed part 32. The triangular hole 38c and the elongated hole 38a at the corner part 31 have soft surface, so that a buffer effect in a collision is high. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seat for a swing installed in a park or the like.

  About the swing which is a playground equipment installed in a park etc., various devices are made | formed conventionally in order to reduce the impact at the time of a collision. For example, Patent Document 1 below is a swing stool having a plate-like hard member that supports the weight of a rider and a cushion member that covers the periphery of the hard member, and the cushion member is a periphery of the hard member. And a skirt that hangs down from the edge, and when the skirt collides with a person or the like, it is bent in a hinge shape and moves to the lower side of the hard member to absorb the impact at the time of the collision. It is disclosed.

  Patent Document 2 below discloses a swing stool having the basic structure of the swing stool described in Patent Document 1. This swing stool has a flat core member that supports the weight of the rider and a cushion member that has a predetermined thickness and surrounds the core member, and the cushion member is disposed around the core member. A solid cushion portion and buffer holes arranged in two rows outside the cushion portion.

  The buffer hole is a hole made of a cylindrical recess whose upper surface which is a seat surface is closed and whose lower side is opened, and a boundary portion between adjacent holes is a pillar. Further, the holes in the inner row and the holes in the outer row are alternately provided, and the center of the column between the holes in the inner row is positioned on the extension line of the center of the hole in the outer row along the direction of the swing. Are arranged to be. Further, the cushion member is formed with an outer row column and an inner row column by the outer row hole and the inner row hole, but by reducing the diameter of the inner row hole, The pillar is formed to be thick.

  In the swing stool disclosed in Patent Document 2, when the stool portion collides with a person or the like, the outer skin of the cushion portion is first deformed, and accordingly, the outer column is bent and the inner column is bent. After that, the solid cushion part is deformed so that the impact at the time of collision is gradually reduced.

Japanese Patent No. 3539956 Japanese Patent Publication No.56-32953

  By the way, when swinging the swing, the seated user moves the center of gravity back and forth, so that the position at which the weight is applied to the stool changes at positions below the user's buttocks and legs each time the center of gravity is moved. In particular, a state where weight is added and a state where weight is not added are repeated on the front edge and the rear edge of the upper surface of the stool (the surface in contact with the user's buttocks and feet). That is, repeated loads frequently occur at the front and rear end edges of the stool.

  The swing stool disclosed in Patent Document 1 has a structure in which the skirt bends in a hinge shape to absorb impact when it collides with a person or the like. Frequently occurs, a load is repeatedly applied to the hinge-curved portion, and stress concentration repeatedly occurs in the portion. For this reason, the swing stool disclosed in Patent Document 1 has a problem with the durability of the hinge part.

  Further, in the swing stool disclosed in Patent Document 1, when it collides with a person or the like at the lower end of the skirt, it bends as described above, but when it collides with a person or the like above the skirt, the hinge There is a disadvantage that the cushioning action by the skirt cannot be expected.

  Further, the swing stool disclosed in Patent Documents 1 and 2 is provided with holes arranged in two rows in the width direction in the vicinity of the front and rear end edges where a repeated load is generated. When a load is repeatedly applied to the two rows of holes, the stress concentrates on the connecting portion between the outer column and the inner column. For this reason, in the stool described in Patent Documents 1 and 2, there is a problem in the durability of the column portion between the two rows of holes.

  An object of the present invention is to improve a swing sheet, and more particularly to provide a swing sheet that can sufficiently absorb an impact and has high durability in order to eliminate the inconvenience.

  To achieve the above object, the swing seat of the present invention is a swing seat comprising a plate-like base that supports the weight of a user, and a cushion that covers at least the upper and side surfaces of the base. When the swinging direction of the swing is the front-rear direction and the direction that is orthogonal to the swinging direction is the left-right direction, the cushion body includes at least a solid part provided at the front and rear of the base, and the solid part A buffer hole provided at an outer position in the front-rear direction, and the base body is provided with a restraining portion for preventing bending of the solid part at the front and rear end edges, and the buffer hole is closed at the top. The lower part is opened, the corners are formed in a circular shape when viewed from the bottom, and are arranged in one row.

  According to the swing seat of the present invention, since the buffer holes are provided in a line along the solid portion of the cushion body, even when a load is applied to the front end portion or the rear end portion of the cushion body. The load is applied to the wall portion (column) between the buffer holes and the solid portion. Further, bending of the back surface of the solid portion is suppressed by the restraining portion of the base body. Thus, the seat for a swing of the present invention does not have a hinge structure like the stool described in Patent Document 1, and the connecting portion between the columns as in the stool disclosed in the known documents 1 and 2. Since stress does not concentrate, durability can be improved as compared with the conventional one.

  Further, in the seat for a swing of the present invention, the cushion body has a recessed portion with a small amount of protrusion in the front-rear direction from the restraining portion at a position where the load of the user at the front-rear edge is applied, and the solid body It is preferable that the portion is formed with a constant width in the front-rear direction, and the buffer hole is formed shorter in the front-rear direction in the recessed portion than in other portions.

  According to this configuration, since the load applied by the user is received by the recessed portion of the cushion body, the bending moment with respect to the cushion body generated by the load applied to the tip edge of the recessed portion is compared with other portions. Become smaller. Therefore, this configuration can improve durability compared to a conventional stool that is rectangular in plan view. In addition, by providing the recessed portion, the other part of the cushion body becomes a protruding portion that protrudes more than the recessed portion, and in the protruding portion, the length of the buffer hole in the front-rear direction is longer than the recessed portion. Since it is formed longer and the buffering action becomes larger (softer) than the recessed portion, no disadvantage is caused by forming the recessed portion.

  In the swing seat of the present invention, it is preferable that the buffer hole is formed in a fan shape that spreads outward in a bottom view in the four corners of the cushion body. According to this configuration, the interval between the pair of pillars forming the fan-shaped buffer holes is wider at the position closer to the surface of the cushion body than the position near the solid body. The buffering action of the part increases. Therefore, even when a person or the like collides with the corner of the cushion body, the impact can be greatly reduced.

  In the swing seat of the present invention, it is preferable that the buffer hole is formed so as to gradually increase in diameter from the upper side to the lower side. The cushion body is usually formed in a shape close to a rectangular parallelepiped, but the cushioning action of the lower end portion of the cushion body is compared with the upper position by forming the buffer hole so as to increase in diameter from above to below. Can be enlarged. Therefore, even when a person or the like collides with the lower end portion of the cushion body, the impact can be greatly reduced.

(A)-(d) is explanatory drawing which shows the sheet | seat for swings which is an example of embodiment of this invention. II-II sectional view taken on the line of FIG. FIG. 2 is a partially enlarged view of the back surface of the swing sheet of FIG.

  Next, an example of the embodiment of the seat for a swing according to the present invention will be described with reference to FIGS. In the present application, the vertical direction in FIG. 1A will be described as the front-back direction of the swing, the left-right direction in FIG. 1A will be described as the left-right direction of the swing, and the vertical direction in FIG.

  As shown in FIGS. 1A to 1D and FIG. 2, the swing sheet 1 of the present embodiment includes a plate-like base body 20 as a whole and a cushion body 30 provided so as to surround the periphery of the base body 20. And a mounting bracket 40 extending in an inverted V shape upward from the left and right positions of the cushion body 30.

  The base body 20 is formed by extrusion molding of an aluminum alloy. As shown in FIG. 2, the base body 20 includes a restraining portion 21 extending downward from the front and rear end edges and two ribs 22 provided in parallel in the front and rear direction central portion. I have. Moreover, as shown in FIG.1 (d), the attachment hole 23 by which the attachment bracket 40 is penetrated in the left-right direction edge part vicinity is provided in four places.

  As shown in FIG. 2, the restraining portion 21 is formed in a square C shape in a sectional view, the front and rear surfaces are formed flat, and a projecting portion 24 that projects inward is provided at the lower end portion. . Further, the rib 22 is chamfered in a circular arc shape at the lower end edge exposed on the surface.

  As shown in FIG. 1 (a), the cushion body 30 has four corners 31 formed in an arcuate shape, and the front and rear edges are also curved in a large arcuate shape. A recessed recess 32 is formed. As shown in FIGS. 1A and 2, the cushion body 30 has a non-slip block 33 projecting in a hexagonal shape on the surface, and a non-slip projection 34 formed long in the left-right direction near the front and rear edges. And are provided. As shown in FIG. 1B, the periphery of the mounting bracket 40 is a guard portion 35 that is raised upward, and has a through hole 36 into which the mounting bracket 40 is inserted.

  In this embodiment, the cushion body 30 is formed by integrally molding with the base body 20 using EPT (ethylene / propylene rubber) as a material. As a result, the cushion body 30 is fixed to the surface of the base body 20, and the restraining portion 21 of the base body 20 enters the inside thereof. Since the suppressing part 21 is provided with the protruding part 24, the cushion body 30 and the base body 20 are firmly fixed to each other by the configuration. In this embodiment, an EPT having a rubber hardness (JIS K 6253) of 40 is used as the material EPT.

  Further, as shown in FIGS. 1D and 2, the cushion body 30 is provided with a solid portion (solid portion) 37 provided outside the restraining portion 21 of the base body 20 and an outside of the solid portion 37. The buffer hole 38 is formed. The solid portion 37 is formed such that the width between the outer side of the suppressing portion 21 and the buffer hole 38, that is, the width in the front-rear direction is constant. The buffer holes 38 have various forms as will be described later, but all corners are formed in an arc shape so that stress concentration does not occur.

  As shown in FIG. 3, the buffer hole 38 is provided in the vertically long slot 38 a provided in the vicinity of the central portion of the cushion body 30 in the left-right direction, the circular hole 38 b provided in the recessed portion 32, and the corner portion 31. The fan-shaped triangular hole 38c and the flat hole 38d long in the front-rear direction provided in the vicinity of the left and right edges of the cushion body 30 are provided. Further, as shown in FIG. 2, each of the buffer holes 38 is formed to have a trapezoidal shape in a cross-sectional view in which the upper portion is narrow and gradually widens as it goes downward. A wall 39 a is formed between the buffer holes 38, and an outer skin 39 b is formed between the buffer holes and the surface of the cushion body 30.

  The mounting bracket 40 is inserted into a through hole 36 provided in the guard portion 35 of the cushion body 30, and a screw portion 41 at the tip passes through the mounting hole 23 of the base body 20 and is exposed to the outside. It is attached. In the present embodiment, the mounting bracket 40 is formed using stainless steel. A chain, a rope, or the like is connected to the mounting bracket 40 and is attached to a swing frame provided in a park or the like.

  Since the seat 1 for a swing according to the present embodiment has the above-described configuration, when the user sits on the surface of the cushion body 30 and shakes, the weight of the user is applied near the front and rear edges of the cushion body 30. . At this time, referring to FIG. 2, for example, when a load is applied from above the front (right side in FIG. 2) anti-slip projection 34, a downward bending moment is applied to the cushion body 30 around the upper end of the right edge of the base body 20. Will occur. However, since the restraining portion 21 extending downward is formed at the front and rear end edges of the base body 20, the load applied from the anti-slip protrusion 34 is supported by the restraining portion 21 via the wall portion 39 a and the solid portion 37.

  The restraining portion 21 is formed slightly shorter than the thickness of the cushion body 30 and has a length substantially the same as the thickness of the cushion body 30. For this reason, since the cushion body 30 of this embodiment does not deform | transform like a hinge like the skirt disclosed by the said patent document 1, the problem that only a specific part fatigues does not arise. Further, since the buffer holes 38 are arranged in one row around the cushion body 30, the durability is higher than those disclosed in Patent Documents 1 and 2 that are arranged in two or more rows.

  Further, the cushion body 30 is provided with a recessed portion 32, and the recessed portion 32 is recessed inward from the central portion of the front and rear end edges of the cushion body 30. For this reason, even when the weight of the user is added, the bending moment generated in the recessed portion 32 is smaller than the bending moment generated in other places, and thus the influence on the cushion body 30 is reduced. Further, the portion where the recessed portion 32 is provided is often located under the foot (thigh) when the user is seated, and is located under the foot even when the user is standing. There are many cases to do. Therefore, deterioration of the cushion body 30 can be suppressed by providing the recessed portion 32. Furthermore, by providing the recessed portion 32, it is possible to provide a sheet having a higher design than that of a conventional simple rectangular sheet.

  Further, in the present embodiment, guard portions 35 are provided on the left and right outer sides of the recessed portion 32, and the guard portions 35 spread in a mountain shape to the vicinity of the front and rear end edges of the cushion body 30 as shown in FIG. Is formed. For this reason, this guard part 35 is effective as the rib of the front-back direction of the cushion body 30, receives a part of load added to the recessed part 32, and has contributed to the durability improvement of the cushion body 30 whole.

  Further, since the anti-slip block 33 and the anti-slip protrusion 34 are provided on the surface of the cushion body 30, it is difficult for the user to slip on the seat. Further, since the anti-slip block 33 is formed in a hexagonal shape in plan view, it has higher durability and higher design than a simple thin line or a small hemispherical protrusion. Further, since the anti-slip protrusion 22 has a relatively wide width, it has a highly durable shape. Further, the anti-slip block 33 is provided with a space between each other, and the left and right ends of the anti-slip projection 22 are separated from the guard part 35 of the cushion body 30, so that the rainwater is separated even when it rains. It does not flow downward between the blocks or ribs and accumulate on the surface of the cushion body 30.

  Next, the operation of each part when a certain object collides while swinging the swing sheet 1 of the present embodiment will be described. When any object collides during use of the swing seat 1, first, the outer peripheral surface of the cushion body 30 and the object come into contact with each other. Since the cushion body 30 is formed of EPT, the material itself has cushioning properties. Further, a buffer hole 38 is provided around the inner surface of the cushion body 30. For this reason, a buffering action is generated by the deformation of the outer skin portion 39b between the outer peripheral surface of the cushion body 30 and the buffer hole 38. Further, a wall 39a is formed between the buffer holes 38, and the buffering action is also generated by bending the wall 39a.

  Further, a solid portion 37 is formed in the inner peripheral portion of the buffer hole 38, and the solid portion 37 is also made of EPT, and therefore has cushioning properties. In addition, since the solid portion 37 receives the object as a surface, even if the impact due to the collision is large, the impact is reliably mitigated between the suppression portion 21 of the base body 20 and the object.

  In particular, in the present embodiment, the buffer holes 38 are elongated holes 38a in the vicinity of the central portion in the left-right direction protruding outward from the recessed portion 32, and the buffer holes 38 are triangular holes 38c at the corners 31 at the four corners. It has become. In the portion where the long hole 38a is provided, the length of the wall 39a between the holes is long, and the thickness of the wall 39a is the same, so the circular hole 38b of the recessed portion 32 is provided. Hardness when pressed from the surface is softer than the part that is. The same applies to the triangular hole 38c, and the outer portion of the triangular hole 38c is wide between the wall portion 39a and the wall portion 39a, and the thickness of the outer skin portion 39b is the same as the other portions. The hardness when pressed from the surface is softer than other parts.

  When the swing sheet 1 of the present embodiment collides with any object, there is a high possibility that these projecting portions will collide first, but these projecting portions collide because they are configured to receive impact softly. The impact on the object can be reduced.

  Further, depending on the use state of the swing, an object may collide with the lower end of the swing sheet 1. In the present embodiment, the buffer hole 38 is formed in a substantially trapezoidal shape in a side sectional view, and the outer skin portion 39b of the lower end portion of the cushion body 30 is thinner than the upper position. For this reason, the impact applied to the object which collided with the lower end part of the swing sheet 1 can be softly absorbed and alleviated.

  In addition, when an object collides in the left-right direction of the swing, since the swing is usually less swayed in the left-right direction, the expected impact is small. Therefore, in the present embodiment, the buffer holes 38 provided on the left and right sides of the cushion body 30 are flat holes 38d formed flat.

  The swing seat 1 of the present embodiment having the above-described configuration was evaluated by simulation analysis to determine whether it conforms to “Japan Playground Equipment Safety Standards JPFA-S: 2008”. The standards are based on the “Guidelines for ensuring safety of playground equipment in city parks (revised version)”, which is a guideline by the Ministry of Land, Infrastructure, Transport and Tourism, and the “Standard for Impact Mitigation of Surface Materials Used in the Use Area of Playground Equipment” Is compliant. As for the value of this criterion, the maximum acceleration (impact) g-max value generated by impact is less than 200, and the head injury criterion HIC (Head Injury Criterion) value is 1000 or less.

  In the simulation analysis, a three-dimensional model for calculation was created based on CAD data, and g-max value and HIC value when a spherical aluminum alloy was collided with the model were obtained. Specifically, assuming a general use of the swing, a method was adopted in which the swing was swung in a state where a weight of 60 kg was applied to the seat, and the swing was made to collide with an aluminum alloy sphere that was regarded as a child's head. The swing sheet 1 of this embodiment had a g-max value of 92 and an HIC value of 256. As a result of the above, it was found that the swing seat 1 of the present embodiment is far below the value of JPFA-S: 2008, which is a standard for playground equipment.

  In the above embodiment, the base 20 is made of an aluminum alloy, and the cushion 30 is made of EPT. However, these are examples, and other known materials can be used. Further, although the rubber hardness of EPT is 40, the rubber hardness may be changed as appropriate within a range that conforms to the above criteria (JPFA-S: 2008). Further, in the present embodiment, the anti-slip block 33 and the anti-slip protrusion 34 are provided on the surface of the cushion body 30, but the shape and position are not limited to the above embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Sheet | seat for swings, 20 ... Base | substrate, 21 ... Inhibition part, 30 ... Cushion body, 37 ... Solid part (solid part), 38 ... Buffer hole.

Claims (4)

A swing seat comprising a plate-like base body that supports the weight of a user and a cushion body that covers at least the upper and side surfaces of the base body, wherein the swinging direction of the swing is the front-rear direction, and is horizontal to the swinging direction. When the orthogonal direction is the left-right direction,
The cushion body includes at least a solid portion provided before and after the base body, and a buffer hole provided at an outer position in the front-rear direction of the solid portion,
The base body is provided with a restraining portion for preventing bending of the solid portion at front and rear end edges,
The seat for a swing, wherein the buffer holes are closed at the top and open at the bottom, are formed in a circular shape when viewed from the bottom, and are provided in one row. The cushion body has a recessed portion with a small protrusion amount in the front-rear direction from the restraining portion at a position where the load of the user at the front-rear edge is applied,
The solid part is formed with a constant width in the front-rear direction,
The seat for a swing according to claim 1, wherein the buffer hole is formed shorter in the front-rear direction in the recessed portion than in other portions.   The swing seat according to claim 1 or 2, wherein the buffer hole is formed in a fan shape that spreads outward in a bottom view at four corners of the cushion body.   4. The swing seat according to claim 1, wherein the buffer hole is formed so as to gradually increase in diameter from the upper side to the lower side. 5.

Images