JP2014092235A - Chair rivet and chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair rivet and a chair in which a projecting amount of the rivet out of a seat surface of the chair is restricted to eliminate inconvenience such as discomfort or damage against its contacted item during use of the chair and when the rivet is removed from the chair, the rivet can be conveniently decomposed.SOLUTION: A chair rivet 100 comprise a rivet main body 110 and a rivet pin 120. The rivet main body 110 comprises a cylindrical barrel 111 and a cap part 113 projected out of an end part of the barrel 111. The outer periphery of the cap part 113 is formed with a main body tapered surface 114 tapering-off toward the axial outside and barrel part 111, and with a main body guide part 115. The rivet pin 120 comprises a rod part 121 and a head part 122 extending out of the rod part 121. The outer periphery of the head part 122 is formed with a pin tapered surface 123 tapering-off toward the axial outside and the rod part 121, and with a pin guide part 24. The head part 122 is formed to be thinner than the cap part 113.

Description

  The present invention relates to a chair-like rivet for fixing a plate-shaped seat plate and a backrest constituting a chair to a frame, and a chair provided with the chair rivet.

  Conventionally, in childcare facilities and school facilities such as nursery schools, kindergartens, elementary schools, junior high schools, and high schools, chairs having a structure in which a wooden seat plate and a backrest are fixed to a metal frame are widely used. In this case, the chair has a wooden seat plate or backrest and a metal frame fixed to each other by a metal chair rivet. For example, Patent Document 1 below discloses a rivet configured such that a press-fit pin is detachably fitted to a tubular rivet body.

JP 2004-147897 A

  However, in the rivet shown in Patent Document 1, a step for hooking a dedicated tool onto the press-fit pin is located on the rivet body, and the head of the press-fit pin is covered with the rivet body. Therefore, there is a problem that the amount of protrusion of the upper part of the rivet from the surface of the chair is large, and there may be a sense of incongruity when the chair is used, and the contact with the rivet may be damaged when the chair is transported. . In addition, the rivet disclosed in Patent Document 1 has a problem in that since a dedicated tool is required for pulling out the press-fit pin, the disassembling work of the rivet cannot be easily performed and is limited.

  The present invention was made to address the above problems, and its purpose is to reduce the amount of protrusion from the chair surface, thereby eliminating inconveniences such as discomfort during use of the chair and damage to contact objects, from the chair. An object of the present invention is to provide a chair rivet and a chair that can be easily disassembled when removed.

  In order to achieve the above object, the present invention is characterized in that an umbrella portion projecting from the body portion is formed at one end portion of the body portion formed in a cylindrical shape, and at the other end portion of the body portion. A rivet body provided with a notch for elastically deforming and expanding the part outward, and a head protruding from the rod part at one end of the rod part inserted into the body part of the rivet body are formed. In the rivet for a chair provided with a rivet pin, the rivet main body is formed with a taper surface that is tapered toward the outer side in the axial direction on the outer peripheral portion of the umbrella portion and the outer periphery of the head portion of the rivet pin on the end surface of the umbrella portion. A flat mounting surface that exposes the portion is formed, and the rivet pin has a head that is thinner than the thickness of the umbrella and has a smaller outer shape than the mounting surface of the umbrella. In .

  According to the feature of the present invention configured as described above, the chair rivet is formed with the head of the rivet pin being thinner than the thickness of the umbrella and positioned below the head of the rivet pin. By forming the main body taper surface on the outer periphery of the umbrella part of the rivet body, the amount of protrusion from the chair surface can be suppressed, and the unevenness of the part protruding from the chair surface (the part above the umbrella part) is suppressed. Can be smooth. The chair rivet has a flat mounting surface formed at the end of the umbrella portion of the rivet body, and the entire head of the rivet pin having an outer shape smaller than the mounting surface is exposed on the mounting surface. Therefore, a tool for pulling out such as a nipper that can pinch the head is placed around the head of the rivet pin on the mounting surface, and a blade is inserted between the mounting surface and the head. Thus, the rod portion of the rivet pin can be easily held and pulled out. As a result, the rivet for the chair can be easily disassembled when being removed from the chair while eliminating inconveniences such as uncomfortable feeling during use of the chair and damage to the contact object.

  Another feature of the present invention is that, in the chair rivet, the rivet pin is formed with a pin guide portion that narrows toward the rod portion on the outer peripheral portion of the head.

  According to another feature of the present invention configured as described above, the chair rivet is formed with a pin guide portion that narrows toward the rod portion on the outer peripheral portion of the head portion of the rivet pin. It becomes easy to insert the blade of a drawing tool between the mounting surface and the head of the rivet pin. Thereby, the rivet for a chair becomes easier to disassemble the rivet pin and the rivet body.

  Another feature of the present invention is that, in the chair rivet, the rivet pin is formed in a shape such that the head fits inside the extension line of the main body taper surface of the umbrella portion of the rivet main body.

  According to another feature of the present invention configured as described above, the chair rivet is formed in a shape in which the head of the rivet pin fits inside the extension line of the main body taper surface of the umbrella portion of the rivet main body. The amount of protrusion of the chair rivet from the chair surface can be suppressed and the unevenness of the portion protruding from the chair surface can be suppressed and smoothed. Thereby, the rivet for chairs can suppress inconveniences, such as an uncomfortable feeling at the time of use of a chair, and damage of a contact thing more effectively.

  Another feature of the present invention is that, in the chair rivet, the rivet pin is formed with a pin taper surface that narrows outward in the axial direction on the outer peripheral portion of the head.

  According to another feature of the present invention configured as described above, the chair rivet is formed with a pin taper surface that narrows outward in the axial direction on the outer periphery of the head of the rivet pin. The amount of protrusion from the chair surface can be suppressed, and the unevenness of the portion protruding from the chair surface can be suppressed and smoothed. Thereby, the rivet for chairs can suppress inconveniences, such as an uncomfortable feeling at the time of use of a chair, and damage of a contact thing more effectively.

  Another feature of the present invention is that, in the chair rivet, the rivet main body is formed with a main body guide portion that narrows toward the trunk portion on the outer peripheral portion of the umbrella portion.

  According to another feature of the present invention configured as described above, the chair rivet is formed with a main body guide portion that narrows toward the trunk portion on the outer peripheral portion of the umbrella portion of the rivet main body. A tool for pulling out is placed around the umbrella portion of the rivet body on the chair surface and a blade is inserted between the chair surface and the umbrella portion so that the body portion of the rivet body can be easily held and pulled out. it can. Thereby, the rivet for chairs can be easily removed from the chair.

  Further, the present invention can be implemented not only as an invention of a chair rivet but also as an invention of a chair using the chair rivet.

  Specifically, the chair includes a seating surface for a person to sit on and a frame that supports the seating surface, and the seating surface is any one of claims 1 to 5 with respect to the frame. It is good to fix with the rivet for chairs described in one.

  According to this, the chair can expect the same effect as the said rivet for chairs.

It is a partially broken sectional view which shows roughly the external appearance structure and internal structure of the rivet for chairs concerning one Embodiment of this invention, respectively. It is a top view which shows roughly the external appearance structure of the rivet for chairs which concerns on this invention. It is a bottom view which shows roughly the external appearance structure of the rivet for chairs concerning this invention. FIG. 2 is a partially broken cross-sectional view schematically showing an external configuration and an internal configuration in a state where a plate member and a frame are fixed by a chair rivet shown in FIG. 1. It is a disassembled perspective view of the chair comprised using the rivet for chairs shown in FIG.

  Hereinafter, an embodiment of a rivet 100 for a chair according to the present invention will be described with reference to the drawings. FIG. 1 is a partially broken cross-sectional view schematically showing an external configuration and an internal configuration of a chair rivet 100 according to the present invention. FIG. 2 is a plan view schematically showing the external configuration of the chair rivet 100 according to the present invention. FIG. 3 is a bottom view schematically showing an external configuration of the chair rivet 100 according to the present invention. 4 is a partially broken cross-sectional view schematically showing an external configuration and an internal configuration in a state where the plate member 91 and the frame 92 are fixed by the chair rivet 100 shown in FIG. FIG. 5 is an exploded perspective view of a chair configured using the chair rivet 100 shown in FIG. In addition, since each figure referred in this specification may represent typically some components, such as exaggerating in order to make an understanding of this invention easy, the dimension between each component is shown. And ratios may vary.

  The chair rivet 100 includes a frame 92 that constitutes a skeleton made of a metal plate, bar, or pipe with a plate member 91 such as a wooden seat 91a or a backrest 91a in a chair 90 used in a childcare facility or school facility. It is a fastening part for fixing to.

(Composition of rivet for chair)
The chair rivet 100 is mainly composed of a rivet body 110 and a rivet pin 120. The rivet main body 110 is a member that is disposed through the plate member 91 and the frame 92 that are fixed to each other by the chair rivet 100, and is configured by forming a metal material into a cylindrical shape. The rivet main body 110 mainly includes a trunk portion 111 and an umbrella portion 113.

  The body portion 111 is a portion disposed in the plate member 91 and the frame 92 in a state where the rod portion 121 of the rivet pin 120 is inserted, and has a cylindrical shape with a length equal to or greater than the thickness of the plate member 91 and the frame 92. Is formed. The outer peripheral portion of the body portion 111 is formed to have a constant outer diameter that is in sliding contact with a through-hole-shaped pilot hole 93 formed in advance in the plate member 91 and the frame 92, and the outer diameter of the lower end portion in the outer peripheral portion. Is formed so as to be gradually narrowed so that it can be easily inserted into the plate member 91 and the frame 92. On the other hand, the inside of the barrel portion 111 has a straight portion 111a formed with an inner diameter that allows the rod portion 121 to be inserted and removed, and an inner diameter on the lower end side of the barrel portion 111 is gradually reduced to be smaller than the outer diameter of the rod portion 121. It is comprised with the formed small diameter part 111b.

  The notch 112 is a groove for elastically deforming the lower end portion side of the trunk portion 111 outward, and is formed to extend from the illustrated lower end portion of the trunk portion 111 toward the umbrella portion 113 side. In this case, the notch portion 112 is formed in a cross shape that divides the body portion 111 into four equal parts in a bottom view. That is, the notch 112 is a so-called slit.

  The umbrella portion 113 is a portion for hooking the rivet body 110 on the plate member 91 and is formed in a substantially disc ring shape projecting in a flange shape from the upper end portion of the trunk portion 111. In this case, the umbrella 113 is formed to have a minimum thickness and an outer diameter that can withstand the axial force generated when the plate member 91 and the frame 92 are fixed. Specifically, it is preferable that the thickness of the umbrella portion 113 is set to 0.5 mm to 3.0 mm, and the outer diameter is set to 6 mm to 15.0 mm.

  The umbrella portion 113 is formed with a main body taper surface 114 and a main body guide portion 115 on the outer periphery. The main body taper surface 114 is a portion for relaxing the feeling of the umbrella 113 protruding from the plate member 91, and the outer periphery of the umbrella 113 is formed in a curved surface shape that gradually decreases in diameter in the axial direction. Has been. In the present embodiment, the main body tapered surface 114 is formed by a curved surface having a radius of 12.7 mm.

  The main body guide portion 115 is a portion for facilitating insertion of the blade portion E of the extraction tool between the plate member 91 and the umbrella portion 113, and the outer peripheral portion of the umbrella portion 113 faces the trunk portion 111 side. It is formed in a curved surface shape that gradually decreases in diameter. In the present embodiment, the main body guide portion 115 is configured by a curved surface having a radius of 0.2 mm.

  A mounting surface 116 is formed on the upper end surface of the umbrella portion 113 in the figure. The mounting surface 116 is a portion on which the head 122 of the rivet pin 120 is mounted in a state where the entire side surface and upper surface of the head 122 are exposed, and is formed in a planar shape. The placement surface 116 is formed to have a size protruding from the outer peripheral portion of the head 122 of the rivet pin 120. In this case, it is preferable that the mounting surface 116 protrudes from the outer peripheral portion of the head 122 with a size of 0.1 mm or more and 3.0 mm or less.

  The rivet pin 120 is a member inserted into the rivet main body 110, and is configured by forming a metal material into a rod shape. The rivet pin 120 is mainly composed of a rod part 121 and a head part 122. The rod part 121 is a part inserted into the straight part 111 a and the small diameter part 111 b inside the body part 111 in the rivet body 110, and is formed in a round bar shape having a length longer than that of the rivet body 110. The outer peripheral portion of the rod portion 121 is formed to have a constant outer diameter that is in sliding contact with the straight portion 111a of the trunk portion 111, and the outer diameter of the lower end portion of the outer peripheral portion is gradually narrowed to form the straight portion 111a and It is configured to be easily inserted into the small diameter portion 111b.

  The head portion 122 is a portion for hooking the rivet pin 120 onto the umbrella portion 113 in the rivet body 110 and is formed in a substantially disk shape projecting in a flange shape from the upper end portion of the rod portion 121. The head 122 has a protruding amount, that is, a thickness, such as a human body, a chair 90 at the time of nesting or a packaging member of the chair 90, that is, a thickness, a thickness, etc. Specifically, the thickness is smaller than the thickness of the umbrella portion 113. In the present embodiment, the head portion 122 is formed with a thickness of 0.7 mm and a thickness that fits inside the extension line L of the main body tapered surface 114 of the umbrella portion 113. The thickness of the head portion 122 is preferably less than half the thickness of the umbrella portion 113.

  The head 122 has an outer diameter that is smaller than the placement surface 116 of the umbrella 113, and a pin taper surface 123 and a pin guide 124 are formed on the outer periphery. The pin taper surface 123 is a portion for relaxing the protruding feeling of the head portion 122 from above the umbrella portion 113, and the outer peripheral portion of the head portion 122 is formed in a curved surface shape that gradually decreases in diameter toward the outside in the axial direction. ing. In the present embodiment, the pin taper surface 123 is a curved surface having a radius of 12.7 mm. The illustrated upper end surface of the head portion 122 is formed in a flat shape so as to alleviate the feeling of overhanging the head portion 122 from the umbrella portion 113.

  Further, the pin guide portion 124 is a portion for facilitating insertion of the blade portion E of the extraction tool between the placement surface 116 of the umbrella portion 113 and the head portion 122, and the outer peripheral portion of the head portion 122 is a rod. It is formed in a curved surface shape that gradually decreases in diameter toward the portion 121 side. In this embodiment, the pin guide part 124 is comprised by the curved surface whose radius is 0.1 mm.

(Activation of chair rivet 100)
Next, the operation of the chair rivet 100 configured as described above will be described. First, the user prepares the chair rivet 100 together with the plate member 91 and the frame 92 constituting the chair 90. In this case, the chair rivet 100 is prepared in a state where the rivet main body 110 and the rivet pin 120 are temporarily fixed with an adhesive having a weak adhesive strength that does not easily separate. Next, after positioning the plate member 91 at a predetermined position on the frame 92, the user attaches the chair rivet 100 to the plate member 91 and the frame 92 through the prepared pilot holes 93.

  Specifically, the user pushes the rod portion 121 of the rivet pin 120 into the body portion 111 after inserting the rivet main body 110 to which the rivet pin 120 is temporarily fixed into the prepared hole 93. In this case, the user drives the rivet pin 120 into the rivet body 110 to bring the head 122 of the rivet pin 120 into close contact with the umbrella 113 of the rivet body 110, that is, the placement surface 116. Thus, the chair rivet 100 fixes the plate member 91 to the frame 92 by the lower end portion of the trunk portion 111 of the rivet body 110 being pushed by the rod portion 121 of the rivet pin 120 and elastically deforming outward. Can do.

  The user completes the chair 90 by fixing each of the prepared holes 93 in the plate member 91 and the frame 92 to each other using the chair rivet 100. When the chair 90 thus completed is used or transported, the chair rivet 100 is formed such that the head 122 of the rivet pin 120 is thinner than the thickness of the umbrella 113 and the umbrella 113 and The curved main body taper surface 114 and pin taper surface 123 are formed on the outer peripheral surface of the head 122, respectively, so that the protruding amount of the chair rivet 100 from the surface of the chair 90 and the feeling of unevenness can be suppressed.

  Next, when the plate member 91 is separated from the frame 92 during maintenance of the chair 90, the user removes the chair rivet 100 from the plate member 91 and the frame 92. Specifically, after the user prepares a drawing tool made of a general nipper, the user pulls the drawing tool between the umbrella portion 113 of the rivet body 110 and the head portion 122 of the rivet pin 120 on the plate member 91. Insert the blade E. In this case, since the placement surface 116 on which the head 122 of the rivet pin 120 is placed is formed so as to protrude from the outer peripheral portion of the head 122, the user places the blade E of the extraction tool on the placement surface 116. It can be stably placed and positioned on the head 122. Further, since the pin guide portion 124 is formed on the rod portion 121 side of the head portion 122 of the rivet pin 120, the user can easily insert the blade E of the extraction tool between the umbrella portion 113 and the head portion 122. Can be included. Further, since the side surface and the upper surface of the head 122 are exposed on the mounting surface 116, the user can apply the blade E of the extraction tool from any direction around the head 122 and pinch it. Workability is easy.

  Next, the user pulls out the rod portion 121 of the rivet pin 120 from the body portion 111 of the rivet body 110 by operating the pulling tool after holding the rod portion 121 in the rivet pin 120 with the pulling tool. Thereby, the rivet 100 for chairs cancels the elastic deformation to the outer side of the outer peripheral part of the trunk | drum 111 in the rivet main body 110 arrange | positioned in the board member 91 and the flame | frame 92. FIG. Therefore, the user inserts the blade E of the extraction tool between the plate member 91 and the umbrella portion 113 of the rivet main body 110, holds the body 111, and pulls it out from the lower hole 93, thereby removing the rivet main body 110. Can be removed from the plate member 91 and the frame 92. Even in this case, since the main body guide portion 115 is formed on the trunk portion 111 side of the umbrella portion 113 of the rivet main body 110, the user can easily pull the blade E of the extraction tool between the plate member 91 and the umbrella portion 113. Can be inserted in between.

  Then, the user can separate the plate member 91 from the frame 92 by removing the other chair rivet 100 that fixes the plate member 91 and the frame 92 in the same procedure. Thereafter, the user discards the used chair rivet 100 removed from the plate member 91 and the frame 92.

  As can be understood from the above description of operation, according to the above embodiment, the chair rivet 100 is formed such that the head 122 of the rivet pin 120 is thinner than the thickness of the umbrella 113, and the rivet pin The main body taper surface 114 is formed on the outer peripheral portion of the umbrella portion 113 of the rivet main body 110 located below the head portion 122 of the 120, whereby the amount of protrusion from the surface of the chair 90 can be suppressed and the surface of the chair 90 The unevenness of the portion protruding from the surface can be suppressed and smoothed. In addition, the chair rivet 100 has a planar mounting surface 116 formed at the end of the umbrella 113 of the rivet body 110, and a rivet pin having an outer shape smaller than the mounting surface 116 on the mounting surface 116. Since the entire head 120 of the head 120 is exposed, a drawing tool is disposed around the head 122 of the rivet pin 120 on the mounting surface 116 and the blade E is interposed between the mounting surface 116 and the head 122. The rod portion 121 of the rivet pin 120 can be easily sandwiched and pulled out by inserting. As a result, the rivet 100 for a chair can be easily disassembled when being removed from the chair 90 while eliminating inconveniences such as an uncomfortable feeling during use of the chair 90 and damage to contact objects.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

  For example, in the above embodiment, the curved main body taper surface 114 and the pin taper surface 123 are formed on the outer peripheral surfaces of the umbrella portion 113 of the rivet main body 110 and the head portion 122 of the rivet pin 120, respectively. However, the main body taper surface 114 and the pin taper surface 123 are not necessarily limited to the above-described embodiment as long as the main body taper surface 114 and the pin taper surface 123 are formed in a tapered shape that becomes narrower toward the outside in the axial direction of the rivet main body 110 and the rivet pin 120. Therefore, the main body taper surface 114 and the pin taper surface 123 can also be formed in a conical taper shape that narrows linearly toward the outside in the axial direction of the rivet main body 110 and the rivet pin 120.

  Moreover, in the said embodiment, the pin taper surface 123 was formed on the outer peripheral surface of the head 122 in the rivet pin 120. FIG. However, the head 122 of the rivet pin 120 is sufficiently small in size with respect to the umbrella portion 113 in the rivet body 110, and therefore the pin taper surface 123 can be omitted. That is, the head 122 of the rivet pin 120 can be formed in a columnar shape such as a cylinder or a quadrangular column, for example. Further, the upper end surface of the head portion 122 of the rivet pin 120 is not necessarily a flat surface, and may be formed of a curved surface, for example. Further, when the pin taper surface 123 is formed on the head 122 of the rivet pin 120, the pin taper surface 123 can be formed on the same curved surface or conical surface as the main body taper surface 114. In this case, the chair rivet 100 makes the umbrella 113 and the head 122 smoother by matching the mounting surface 116 and the outer diameter of the rivet body 110 with the outer diameter of the head 122 in contact with the mounting surface 116. You can also connect.

  Further, in the above embodiment, the head 122 of the rivet pin 120 is configured to fit inside the extension line L of the main body taper surface 114 of the umbrella portion 113 of the rivet main body 110. Thereby, the unevenness | corrugation feeling of the head 122 which exists on the board member 91 of the chair 90, and the damage to a contact thing can be suppressed. However, since the head 122 of the rivet pin 120 is sufficiently small in size with respect to the umbrella 113 in the rivet body 110, the head 122 has a shape that protrudes outside the extension line L of the body tapered surface 114 of the umbrella 113. Also good. When the main body taper surface 114 is formed into a curved surface, the extension line L of the main body taper surface 114 forms one common curve, in other words, the main body taper surface 114 forms one continuous curved surface including the extended portion. However, it is not always necessary to have one common curve as in the above embodiment (see FIG. 4).

  Further, in the above embodiment, the curved body guide part 115 and the pin guide part 124 are formed on the outer peripheral surfaces of the umbrella part 113 of the rivet body 110 and the head part 122 of the rivet pin 120, respectively. However, the main body guide part 115 and the pin guide part 124 are not necessarily limited to the above-described embodiment as long as the main body guide part 115 and the pin guide part 124 are formed in a tapered shape that becomes narrower toward the body part 111 side and the rod part 121 side in the rivet main body 110 and the rivet pin 120. Is not to be done. Therefore, the main body guide part 115 and the pin guide part 124 can also be formed in a conical taper shape that linearly narrows toward the trunk part 111 side and the rod part 121 side of the rivet main body 110 and the rivet pin 120, respectively. . Further, the umbrella portion 113 of the rivet main body 110 and the head portion 122 of the rivet pin 120 can be configured by omitting the main body guide portion 115 and the pin guide portion 124, that is, by forming these portions at right angles, for example. .

  Moreover, in the said embodiment, the rivet 100 for chairs was comprised with the metal material. However, the chair rivet 100 is not necessarily limited to the above embodiment as long as the plate member 91 and the frame 92 constituting the chair 90 can be fixed to each other. Therefore, the chair rivet 100 can be made of a resin material instead of or in addition to a metal material, for example. In this case, in the chair rivet 100, the rivet body 110 and the rivet pin 120 can be made of different materials. That is, in the rivet 100 for chairs, the rivet body 110 can be made of a metal material or a resin material, and the rivet pin 120 can be made of a resin material or a metal material. Thus, it becomes easy to perform the clamping operation | work with a drawing tool by comprising by a dissimilar material of mutually different intensity | strength.

  Moreover, in the said embodiment, the rivet 100 for chairs was employ | adopted as the chair 90 used in a childcare facility or a school facility. However, as long as the rivet 100 for chairs is used in order to fix the members which comprise a chair, it is natural that it is not limited to the said embodiment. For example, the chair rivet 100 can be used for a wide variety of chairs such as office work chairs, factory work chairs, chairs used in hospitals, and conference chairs. Also, the material of the members constituting the chair 90 is not limited to wood or metal, and other materials such as resin materials can naturally be used.

E: Cutting tool blade, L: Extension line of main body taper surface,
90 ... chair, 91 ... plate member, 91a ... seat surface, 91b ... backrest, 92 ... frame, 93 ... pilot hole,
100 ... Rivets for chairs,
DESCRIPTION OF SYMBOLS 110 ... Rivet main body, 111 ... trunk | drum, 111a ... straight part, 111b ... small diameter part, 112 ... notch part, 113 ... umbrella part, 114 ... main body taper surface, 115 ... main body guide part, 116 ... mounting surface,
120 ... Rivet pin, 121 ... Rod part, 122 ... Head, 123 ... Pin taper surface, 124 ... Pin guide part.

In order to achieve the above object, the present invention is characterized in that an umbrella portion projecting from the body portion is formed at one end portion of the body portion formed in a cylindrical shape, and at the other end portion of the body portion. A rivet body provided with a notch for elastically deforming and expanding the part outward, and a head protruding from the rod part at one end of the rod part inserted into the body part of the rivet body are formed. In the rivet for a chair provided with a rivet pin, the rivet main body is formed with a taper surface that is tapered toward the outer side in the axial direction on the outer peripheral portion of the umbrella portion and the outer periphery of the head portion of the rivet pin on the end surface of the umbrella portion. parts and planar mounting surface to be exposed is formed a rivet pin, with head is formed to a smaller profile than the mounting surface in a thin thickness and the umbrella portion than the thickness of the umbrella portion Head is in that it is formed into a shape to fit inside the extension line of the body tapered surface in the umbrella portion of the rivet body.

According to the feature of the present invention configured as described above, the chair rivet is formed with the head of the rivet pin being thinner than the thickness of the umbrella and positioned below the head of the rivet pin. By forming the main body taper surface on the outer periphery of the umbrella part of the rivet body, the amount of protrusion from the chair surface can be suppressed, and the unevenness of the part protruding from the chair surface (the part above the umbrella part) is suppressed. Can be smooth. The chair rivet has a flat mounting surface formed at the end of the umbrella portion of the rivet body, and the entire head of the rivet pin having an outer shape smaller than the mounting surface is exposed on the mounting surface. Therefore, a tool for pulling out such as a nipper that can pinch the head is placed around the head of the rivet pin on the mounting surface, and the blade is inserted between the mounting surface and the head. Thus, the rod portion of the rivet pin can be easily held and pulled out. As a result, the rivet for the chair can be easily disassembled when being removed from the chair while eliminating inconveniences such as uncomfortable feeling during use of the chair and damage to the contact object.

Another feature of the present invention is that, in the chair rivet, the rivet pin is formed in a shape such that the head fits inside the extension line of the main body taper surface of the umbrella portion of the rivet main body .

According to another feature of the present invention configured as described above, the chair rivet is formed in a shape in which the head of the rivet pin fits inside the extension line of the main body taper surface of the umbrella portion of the rivet main body. The amount of protrusion of the chair rivet from the chair surface can be suppressed and the unevenness of the portion protruding from the chair surface can be suppressed and smoothed. Thereby, the rivet for chairs can suppress inconveniences, such as an uncomfortable feeling at the time of use of a chair, and damage of a contact thing more effectively.

Another feature of the present invention is that, in the chair rivet, the rivet pin is formed with a pin guide portion that narrows toward the rod portion on the outer peripheral portion of the head.

According to another feature of the present invention configured as described above, the chair rivet is formed with a pin guide portion that narrows toward the rod portion on the outer peripheral portion of the head portion of the rivet pin. It becomes easy to insert the blade of a drawing tool between the mounting surface and the head of the rivet pin. Thereby, the rivet for a chair becomes easier to disassemble the rivet pin and the rivet body.

Claims (6)

An umbrella portion is formed at one end portion of the body portion formed in a cylindrical shape so as to project from the body portion, and a cut portion for elastically deforming and expanding the body portion outward at the other end portion of the body portion. A rivet body provided with a notch,
In a rivet for a chair provided with a rivet pin formed with a head protruding from the rod part at one end of a rod part inserted into the trunk part in the rivet body,
The rivet body is
A tapered body surface is formed on the outer peripheral portion of the umbrella portion, and the planar mounting surface is formed on the end surface of the umbrella portion to expose the outer peripheral portion of the head portion. Has been
The rivet pin is
The chair rivet characterized in that the head has a thickness smaller than the thickness of the umbrella and is smaller than the mounting surface of the umbrella. The chair rivet according to claim 1,
The rivet pin is
A rivet for a chair, characterized in that a pin guide portion that is narrowed toward the rod portion side is formed on an outer peripheral portion of the head portion. In the chair rivet according to claim 1 or 2,
The rivet pin is
A rivet for a chair, wherein the head is formed in a shape that fits inside an extension line of the tapered surface of the main body of the umbrella portion of the rivet main body. In the chair rivet according to any one of claims 1 to 3,
The rivet pin is
A rivet for a chair, characterized in that a pin taper surface that narrows outward in the axial direction is formed on the outer periphery of the head. In the chair rivet according to any one of claims 1 to 4,
The rivet body is
A rivet for a chair, characterized in that a main body guide portion that narrows toward the trunk portion side is formed on an outer peripheral portion of the umbrella portion. A seating surface for people to sit on;
A chair comprising a frame for supporting the seating surface,
The chair, wherein the seating surface is fixed to the frame by the chair rivet according to any one of claims 1 to 5.

Images