JP2012090754A - Resin molded article for chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded article for chair which prevents the generation of sink marks on the surface, even when a recess portion provided for inserting a mounting screw is not allowed to be fully separated from a side.SOLUTION: The resin molded article 1 mounted to a leg 2 of a chair using the mounting screw 3, includes a surface side 4, sidewalls 5 extending from the peripheral edge of the surface side 4, and a screw fastening portion 6 having a bottom surface making contact with the leg 2 and having a hole 6a penetrated by the mounting screw 3 in a height direction of the sidewall 5. The surface side 4, sidewalls 5, and screw fastening portion 6 are integrally formed. The screw fastening portion 6 is formed in the bottom of the recess portion 7 provided in the surface side 4, formed to be separated from the sidewalls 5, and connected to the sidewalls 5 by ribs 8, 9, and 10. The recess portion 7 has a contour shape the same as that of the surface side 4.

Description

  The present invention relates to a resin molded product for a chair. More specifically, the present invention relates to a resin molded product attached to a structural member such as a leg of a chair using a mounting screw.

  As a resin molded product used for a chair, for example, there is a leg cap attached to a pipe frame by screws (Patent Document 1). 5 and 6 show the leg cap. The leg cap 101 has a substantially rectangular parallelepiped shape. The leg cap 101 is provided with a hole 103 through which the attachment screw 102 passes. The attachment screw 102 is inserted and screwed in a state where the hole 103 is aligned with the screw hole 105 of the leg (pipe frame) 104. The hole 103 is provided at the bottom of the recess 106 provided on the front side surface of the leg cap 101. The contour shape of the recess 106 is circular in accordance with the head shape of the mounting screw 102. The leg cap 101 is a solid product provided with a recess 106, a hole 103, and a fitting portion 107 at predetermined positions, and is integrally formed of resin.

JP 2010-5285 A

  However, the leg cap 101 has a large variation in the thickness of the meat portion, and sink marks occur on the surface during resin molding. The variation in the thickness of the leg cap 101 is due to the narrow width of the leg cap 101 and the circular shape of the recess 106 reaching near the side surface of the leg cap 101. Here, by increasing the width of the cap 101, the recess 106 can be separated from the side surface, and the occurrence of sink marks can be prevented. However, the leg cap 101 is attached to the pipe frame 104, and it is difficult to increase the width in the width direction due to its nature. The leg cap 101 is a component that appears in the appearance of the chair, and is a component of the chair design. Therefore, if sink marks occur on the surface of the leg cap 101, the appearance of the chair is deteriorated.

  The present invention provides a chair capable of preventing the occurrence of sink marks appearing on the surface even when the recess cannot be sufficiently separated from the side when the recess for inserting the mounting screw is provided. The purpose is to provide a resin molded product.

  In order to achieve such an object, the invention according to claim 1 is a resin molded product attached to a constituent member of a chair using a mounting screw, and includes a front side surface, a side wall extending from a peripheral edge of the front side surface, and a constituent member. A screw tightening part that is in contact with the bottom surface and has a hole through which the mounting screw penetrates in the height direction of the side wall. The front side surface, the side wall, and the screw tightening part are formed integrally, and the screw tightening part is provided on the front side surface. The concave portion is formed at the bottom of the concave portion and is formed away from the side wall and connected to the side wall by a rib. The contour shape of the concave portion is the same type as the contour shape of the front side surface.

  Therefore, not only when the resin molded product is large enough to separate the screw tightening portion from the side wall, but also when the screw tightening portion must be close to the side wall (small size). Even if it exists, a screw fastening part and a side wall will not be formed directly continuously. For this reason, the thickness of the side wall can be made equal to that of other portions in the vicinity of the screw tightening portion that tends to be partially thick.

  Here, as in the resin molded product for a chair according to claim 2, the contour shape of the front side surface and the contour shape of the recess may be a quadrangle, and a part of the side wall may constitute the wall of the recess.

  According to the resin molded product for a chair according to claim 1, even when it is difficult to ensure a sufficient size and the screw tightening portion must be brought close to the side wall, the thickness of the side wall is made uniform. Therefore, sink marks can be prevented from occurring during the molding of the resin molded product, and the surface of the resin molded product can be finished cleanly. Since the resin molded product constitutes the appearance of the chair, the appearance of the chair can be prevented from being deteriorated by the resin molded product.

  Here, as in the resin molded product for a chair according to claim 2, the contour shape of the front side surface and the contour shape of the concave portion may be a quadrangle, and a part of the side wall may constitute the wall of the concave portion. It is suitable for manufacturing leg caps to be attached to pipe-shaped frames.

The 1st Embodiment of the resin molded product of this invention is shown, (A) is the top view, (B) is the bottom view, (C) is the cross section which follows the CC line of (A) and (B). FIG. 4D is a cross-sectional view taken along line D-D in FIGS. It is a perspective view which shows the chair using the resin molded product of this invention. The 2nd Embodiment of the resin molded product of this invention is shown, (A) is the top view, (B) is the bottom view, (C) is the cross section which follows the CC line of (A) and (B). FIG. 4D is a cross-sectional view taken along line D-D in FIGS. The 3rd Embodiment of the resin molded product of this invention is shown, (A) is the top view, (B) is the bottom view, (C) is the cross section which follows the CC line of (A) and (B). FIG. 4D is a cross-sectional view taken along line D-D in FIGS. It is a perspective view of the conventional resin molded product. It is a longitudinal cross-sectional view of the resin molded product.

  Hereinafter, the configuration of the present invention will be described in detail based on the form shown in the drawings.

  1 and 2 show a first embodiment of a resin molded product for a chair of the present invention. Here, a stacking chair (pipe chair) that can be stacked up and down is taken as an example of the chair, but the applicable chair is not limited to this.

  A resin molded product for a chair (hereinafter simply referred to as a resin molded product) 1 according to the present embodiment is attached to a component member 2 of a chair using a mounting screw 3, and includes a front side surface 4 and a front side surface 4. A side wall 5 extending from the peripheral edge; and a screw tightening portion 6 having a bottom surface that contacts the component member 2 and having a hole 6a passing through the mounting screw 3 in the height direction of the side wall 5; 6 are integrally formed.

  The constituent member 2 of the chair is, for example, a leg, a frame, a seat plate, a back plate, and the like, and is not particularly limited as long as the resin molded product 1 can be attached using the attachment screw 3. The component member 2 of this embodiment is a leg (hereinafter referred to as the leg 2). The leg 2 is formed by bending a round pipe, and the resin molded product 1 is attached to the bottom side of the horizontal portion 2a facing the floor. The resin molded product 1 is attached to the front and rear of the horizontal portion 2a of the left and right legs 2, respectively, and is in contact with the floor and supports the chair. Moreover, the resin molded product 1 also has a function of ensuring a space between the chairs on the lower side when the chairs are stacked up and down, and prevents interference between the seats of the upper and lower chairs. A screw hole 2b is provided at a position where the resin molded product 1 of the leg 2 is attached, and a female screw is formed in the screw hole 2b.

  For the resin molded product 1, the radial direction of the leg 2 and parallel to the front side surface 4 is the width direction, the axial direction of the leg 2 is the length direction, and the radial direction of the leg 2 is perpendicular to the front side surface 4. Is called the height direction.

  FIG. 2 shows a chair to which the resin molded product 1 of the present invention is applied. In this chair, the left and right legs 2 are integrated to form a leg unit 21, and the front leg 23 side is closer to the seat receiving part 22 than the rear leg 25 of the leg 2 and the grounding part 24 ( In the vicinity of the horizontal portion 2a), it is composed of a leg unit 21, which can be stacked up and down by having an opening with the same interval, a seat plate 26 and a backrest 18.

  Specifically, the leg unit 21 includes a pair of left and right legs 2 and 2 formed by continuously bending a steel or stainless steel pipe, for example, a leg joint member 29 such as a leg joint pipe 29 between a front leg portion 23 and a seat. They are integrated into one leg unit 21 by connecting the receiving parts 22 with front and rear leg joint plates (not shown). Each leg 2 is a back that supports a backrest 18 by bending one pipe continuously and projecting upward from the seat receiving part 22, the front leg part 23, the grounding part 24, the rear leg part 25, and the seat receiving part 22. By forming the support part 27, it is formed in a rectangular ring shape when viewed from the side. And the shape of each leg 2 is hold | maintained at the rectangular ring shape by connecting the seat receiving part 22 and the rear leg part 25 by direct welding.

  The resin molded product 1 of the present embodiment has a rectangular parallelepiped shape, and the contour shape of the front side surface 4 is a quadrangle, more specifically, an elongated rectangle along the leg 2. Further, four side walls 5 are provided from each side (edge) of the front side surface 4, and each side wall 5 forms a quadrangle. Each side wall 5 is inclined so as to spread slightly from the front side surface 4. The width of the resin molded product 1 is slightly wider than the diameter of the legs 2.

  The front side surface 4 is provided with a recess 7. The contour shape of the concave portion 7 (the shape of the contour 7a) is the same type as the contour shape of the front side surface 4 (the shape of the contour 4a). In the present embodiment, the contour shape of the recess 7 is a quadrangle that is the same type as the contour shape of the front side surface 4.

  Here, the same type of shape means that the types of shapes (figures) (circular, triangular, quadrangular, pentagonal, etc.) are the same, such as quadrangular and quadrangular, circular and circular, triangular and triangular, etc. The shape itself is different except when the shape itself is the same (for example, a square and a square of a quadrangle, a rhombus and a rhombus of a quadrangle, a regular triangle and a regular triangle of a triangle, or a circle and a circle). The types are the same (for example, a square and a rectangle in a quadrangle, a circle and an ellipse in a circle, a regular triangle and an isosceles triangle in a triangle, etc.). Note that the shape types do not mean only accurate shapes of circles, triangles, squares, pentagons, etc., but also include shapes close to these, and roughly include these shapes. is there.

  By doing in this way, the change of the space | interval of both the outlines 4a and 7a is suppressed at the position where the outline 4a of the front side surface 4 and the outline 7a of the recessed part 7 approach at least. In other words, the contour 4a of the front side surface 4 and the contour 7a of the recess are shaped such that the change in the distance between the contours 4a and 7a can be suppressed at least at the position where the contours 4a and 7a approach each other.

  The recess 7 is for inserting the head of the mounting screw 3, and the contour 7 a of the recess 7 is larger than the head of the mounting screw 3. The opening and bottom surface of the recess 7 are approximately the same size.

  In the present embodiment, the concave portion 7 is provided at the center in the length direction of the front side surface 4. In the present embodiment, since the width of the resin molded product 1 is slightly wider than the diameter of the head of the mounting screw 3, the concave portion 7 is formed in the vicinity of the left and right side walls (side walls in the width direction). A part of the left and right side walls 5 constitutes a wall 7 b of the recess 7. That is, the left and right side walls 5 are the walls 7 b constituting the recesses 7.

  The screw tightening portion 6 is formed at the bottom of the recess 7. The screw tightening portion 6 has a block shape having a certain thickness, and has rigidity against tightening by the mounting screw 3. The inner diameter of the hole 6a through which the mounting screw 3 passes is thinner than the head of the mounting screw 3 and thicker than the shaft portion.

  The screw tightening portion 6 is formed away from the side wall 5 and is connected to the side wall 5 by a rib. That is, the meat stealing portion 13 is provided between the screw tightening portion 6 and the left and right side walls 5. In this embodiment, the ribs (ribs parallel to the front side surface 4) 8 constituting the bottom of the recess 7 and the ribs (ribs in the width direction) 9 and 9 connecting the left and right side walls 5 are connected to the left and right side walls 5, The ribs 10 and 10 in the length direction are connected to the front and rear side walls (side walls in the length direction) 5.

  The cross-sectional shape of the screw tightening portion 6 is substantially the same shape and the same size as the contour shape of the recess 7, and the front and rear surfaces 6 b of the screw tightening portion 6 directly form the recess 7. It has become.

  The side walls 5 surrounding the front and rear cavities 12 and 12 adjacent to the screw tightening portion 6 are reinforced by the ribs 10 and 10 and the ribs 11 and 11 in the width direction.

  The bottom 1 a of the resin molded product 1 has a shape corresponding to the shape of the mounting surface of the leg 2. In this embodiment, since the leg 2 is a round pipe, the bottom 1a of the resin molded product 1 is notched in a bowl shape, and the entire bottom 1a is in contact with the mounting surface of the leg 2.

  The thickness of each part of the resin molded product 1, that is, the top plate constituting the front side surface 4, the side wall 5, the wall 7b constituting the recess 7, the rib 8 constituting the bottom of the recess 7, the rib connecting the left and right side walls 5 9. The thickness of the rib 10 in the length direction and the thickness of the rib 11 in the width direction are substantially the same.

  When the resin molded product 1 is attached to the leg 2, the bottom 1a of the resin molded product 1 is brought into contact with the mounting position of the leg 2, and the position of the hole 6a is adjusted to the position of the screw hole 2b. In this state, the resin molded product 1 can be fixed to the leg 2 by inserting the mounting screw 3 through the hole 6a at the bottom of the recess 7 and screwing it into the screw hole 2b.

  In the conventional resin molded product, the contour shape of the concave portion 7 is circular according to the head shape of the mounting screw 3, but in the present invention, the contour shape of the concave portion 7 is determined according to the contour shape of the front side surface 4. That is, the contour shape of the front side surface 4 and the contour shape of the recess 7 are made the same type. In this way, the width of the resin molded product 1 can be widened, and the recess 7 can be formed so as to be separated from the left and right side walls 5 as well as the width of the resin molded product 1 as in this embodiment. Even when the concave portion 7 approaches the left and right side walls 5, the portion of the side wall 5 close to the concave portion 7 can be made thin.

  Further, since the meat stealing portion 13 is provided between the screw tightening portion 6 and the left and right side walls 5, and the screw tightening portion 6 is separated from the side wall 5, the width of the resin molded product 1 can be widened, and the screw tightening portion 6 is left and right. Of course, even if the width of the resin molded product 1 is narrow and the screw tightening portion 6 approaches the left and right side walls 5, the side wall 5 can be separated from the side walls 5. The portion close to the screw tightening portion 6 can be made thin.

  On the other hand, the other part of the side wall 5 faces the cavity 12, and this part can be originally thin. Therefore, the entire side wall 5 can be thinned, and even if the width of the resin molded product 1 is narrow and the concave portion 7 and the screw tightening portion 6 approach the left and right side walls 5, Variation in wall thickness can be suppressed. Therefore, sink marks can be prevented from occurring when the resin molded product 1 is molded, and the surface of the resin molded product 1 can be finished cleanly. Since the resin molded product 1 constitutes the appearance of the chair, the resin molded product 1 can prevent the appearance of the chair from being deteriorated.

  Although there is a possibility that sink marks may occur in the screw tightening portion 6, the screw tightening portion 6 cannot be seen from the outside, so even if sink marks occur, the appearance of the chair is not affected.

  Next, a second embodiment of the resin molded product of the present invention will be described. In addition, it demonstrates centering around difference with 1st Embodiment, attaches | subjects the same code | symbol about the member same as the member of 1st Embodiment, and abbreviate | omits detailed description about these (hereinafter, the same) ).

  In FIG. 3, the resin molded product 1 of this embodiment is shown. In the present embodiment, the contour shape of the front side surface 4 is circular, and the contour shape of the recess 7 is also circular according to this. The recess 7 is formed at the center of the front side surface 4. Moreover, in this embodiment, the resin molded product 1 is attached to the plate-shaped component 2, and the bottom 1a of the resin molded product 1 is flat.

  In the present embodiment, the wall 7 b constituting the recess 7 is formed so as to be separated from the side wall 5, and the meat stealing portion 13 between the screw tightening portion 6 and the side wall 5 is the back surface of the top plate constituting the front side surface 4. Is formed. A wall 7 b constituting the screw tightening portion 6 and the recess 7 is connected to the side wall 5 by a rib 14. For example, the ribs 14 are provided radially at equal intervals in the circumferential direction.

  The thickness of each part of the resin molded product 1, that is, the thickness of the top plate constituting the front side surface 4, the side wall 5, the wall 7 b constituting the recess 7, and the radial ribs 14 are substantially the same.

  Similarly to the resin molded product 1 of the first embodiment, the resin molded product 1 of the present embodiment can suppress variations in the thickness of the entire side wall 5, and sink marks occur when the resin molded product 1 is molded. Can be prevented, and the surface can be finished cleanly. Therefore, it is possible to prevent the appearance of the chair from deteriorating.

  Next, a third embodiment of the resin molded product 1 of the present invention will be described. In FIG. 4, the resin molded product 1 of this embodiment is shown. In the present embodiment, the recess 7 is expanded to the vicinity of the side wall 5 as compared with the second embodiment. That is, the side wall 5 is a wall 7 b constituting the recess 7, and the front end surface of the side wall 5 is the front side surface 4. Therefore, in the present embodiment, the meat stealing portion 13 is formed up to the back surface of the rib 8 constituting the bottom of the recess 7.

  The thickness of each part of the resin molded product 1, that is, the thickness of the side wall 5 (wall 7 b constituting the recess 7), the rib 8 constituting the bottom of the recess 7, and the radial rib 14 are substantially the same. .

  Similarly to the resin molded product 1 of the first embodiment, the resin molded product 1 of the present embodiment can suppress variations in the thickness of the entire side wall 5, and sink marks occur when the resin molded product 1 is molded. Can be prevented, and the surface can be finished cleanly. Therefore, it is possible to prevent the appearance of the chair from deteriorating.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention.

  For example, in the above description, the resin molded product 1 for providing a predetermined interval between chairs stacked vertically is taken as an example, but applicable resin molded products are not limited to this. In stacking chairs that stack chairs, resin pipes are used to prevent interference by providing a predetermined space between the front and back chairs, and pipe chairs adjacent to each other are connected when pipe chairs are placed side-by-side or left and right. The present invention may be applied to a resin molded product having a connection hook for performing the above, or may be applied to other resin molded products. In short, it is not particularly limited as long as it is a resin molded product of the type that is attached using the attachment screw 3 and is applicable.

  In the above description, the resin molded product 1 of the type attached to the bottom surface of the horizontal portion 2a of the leg (component member) 2 is taken as an example, but the upper surface of the horizontal component member 2, the side surface of the vertical component member 2, etc. It may be of a type that is attached to. That is, in the above description, the resin molded product 1 is used in a posture in which the bottom 1a is up (upside down posture), but the usage posture of the resin molded product 1 is not limited to this, and the bottom 1a May be used in a posture in which the bottom 1a lies down (stands up) (an upright posture), an oblique posture, or may be used in other postures.

  Further, in the above description, the contour shape of the front side surface 4 and the concave portion 7 is an example of the resin molded product 1 having a square or circular shape, but the contour shape of the front side surface 4 and the concave portion 7 is not limited thereto. , Rhombus, triangle, ellipse, pentagon, etc.

1 resin molded product 2 legs (components)
3 Mounting screw 4 Front side surface 5 Side wall 6 Screw tightening portion 6a Hole through which the mounting screw passes 7 Recessed portion provided on the front side surface 8, 9, 10, 11 Rib

Claims (2)

  In a resin molded product that is attached to a chair component using a mounting screw, the front side surface, a side wall extending from a peripheral edge of the front side surface, the bottom surface contacting the component member, and the mounting screw in the height direction of the side wall A screw tightening portion having a hole through which the front side surface, the side wall, and the screw tightening portion are integrally formed, and the screw tightening portion is formed at the bottom of a recess provided in the front side surface. The chair resin is characterized in that it is formed away from the side wall and connected to the side wall by a rib, and the contour shape of the concave portion is the same type as the contour shape of the front side surface. Molded product.   2. The resin molded product for a chair according to claim 1, wherein a contour shape of the front side surface and a contour shape of the concave portion are quadrangular, and a part of the side wall constitutes a wall of the concave portion.

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