JP5343244B2 - Assembly structure of resin parts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembly structure of resin members which simply installs the resin members by engaging an engaging pin and an engaging hole, does not demand excessive pulling force in canceling an engagement state of the engaging pin and the engaging hole, prevents the engaging pin from being broken unexpectedly, and excellently cancels engagement between the engaging pin and the engaging hole when the assembly state of the resin members are canceled. <P>SOLUTION: In the assembly structure, an engaging nail forming area 95A provided with an engaging nail 952 and an engaging nail non-forming area 95B without the engaging nail 952 are provided around an axis by being divided into two at an end part of an engaging pin 95 high in rigidity integrally provided with a seat rear cover 9. A part of the seat rear cover 9 provided with the end part of the engaging pin 95 is inclined in the state the engaging pin 95 is inserted in an engaging hole 311, so that an engagement state of the engaging pin 95 and the engaging hole 311 is canceled by using a tilting means for allowing the engaging nail non-forming area 95B to tilt the engaging pin 95 itself to angle at which a periphery 311a of the engaging hole 311 is pressured. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an assembling structure of resin members configured such that an engagement pin and an engagement hole are engaged so that the resin members can be assembled together.

  Conventionally, as a structure for assembling resin members, one resin member is provided with an elastically deformable engagement pin having an engagement claw at the tip, and this engagement pin is provided on the other resin member. A mode in which the resin members are assembled to each other by using the elastic deformation of the engaging pin itself to the engaging hole is mentioned.

As a specific embodiment, in the case where two shell structures, for example, a back shell and a back cover of a chair are assembled to each other, a cylindrical body is provided around the axis by a slit at an appropriate position of the back cover. A plurality of engagement pins that are divided into three and have engagement claws integrally at the tip are provided, and these engagement pins are respectively provided in cylindrical engagement holes provided on the back shell that are not elastically deformable or difficult to elastically deform. It was inserted by pressing, and in the process, the engagement pin temporarily retracted in the direction of decreasing the shaft diameter, and it was provided when it passed through the opening edge on the opposite side of the engagement hole or in the engagement hole When the engagement pin is elastically restored after passing through the engagement protrusion, the engagement claw is engaged with the opening edge of the engagement hole on the opposite side or the engagement protrusion, and the back cover and the back shell are engaged. They are assembled integrally (see, for example, Patent Document 1).
Japanese Patent No. 3874375 (see FIG. 4 etc.)

  By the way, in the conventional case, after assembling the resin members once, when the assembled state has to be released such as parts replacement or maintenance, the force to separate the resin members from each other, In this case, the engaging claw of each engaging pin is forcibly elastically deformed by a pulling force exceeding the engaging force between the engaging claw and the engaging hole, and the engaging pin is extracted from the engaging hole.

  However, since the engaging claw of each engaging pin is forcibly elastically deformed, excessive pulling force is required at the time of the separation work, and in addition to the problem that the separation work cannot be performed smoothly, If it cannot be elastically deformed smoothly, or if a sudden pulling force is applied to the engaging claw, the engaging claw and thus the engaging pin itself may be damaged. It is necessary to replace the resin member integrally provided with the engaging claws, which is inferior in terms of cost and work efficiency.

  The present invention has been made paying attention to such a problem. The main object of the present invention is to easily assemble resin members by engaging engagement pins and engagement holes with each other. When releasing the assembled state of the resin members, excessive pulling force is not required to release the engagement state between the engagement pin and the engagement hole, and the engagement pin is prevented from being unexpectedly damaged. Then, it is providing the assembly | attachment structure of the resin members which can perform engagement cancellation | release with an engagement pin and an engagement hole smoothly.

That is, assembly structure of the resin members to each other of the present invention, the engagement pin provided integrally with the outer edge or the outer edge vicinity portion of the outer shell, the first resin member, the second resin member The resin member is configured to be assembled with an engagement hole provided in a certain inner shell by utilizing the elasticity of the peripheral edge of the engagement hole. The main part is a columnar or cylindrical shaft part, and the front end part of the shaft part is formed around the axis, and the engagement claw forming area provided with the engagement claw and the engagement claw non-engagement not provided with the engagement claw It is divided into a formation region and is less elastically deformed than the peripheral edge of the engagement hole, and the engagement hole has a circular shape for externally fitting the engagement pin, and the peripheral edge Is provided with an elastic deformation inducing portion consisting of a slit or a notch. In a state in which engagement is inserted into the engagement hole, the engagement claw unformed the engagement pin itself by applying an operating force to deflect the outer edge of the outer shell in a direction away from the inner shell Using the tilting means capable of inclining to an angle at which the portion of the region or shaft portion closer to the base end side than the engagement claw non-formation region hits the peripheral edge of the engagement hole and can press the peripheral edge, It is configured to release the engagement state between the pin and the engagement hole.

If it is such, even if it is a case where the force which pulls an engagement pin to an anti-insertion direction acts in the state where the engagement pin was inserted in the engagement hole and engaged, the shaft part of the engagement pin The engagement claw forming region is engaged with the engagement hole, and the engagement pin can be prevented from coming off from the engagement hole, and the distal end portion of the shaft portion of the engagement pin is connected to the engagement claw formation region and the engagement claw. Since it is divided into two parts around the axis into the non-formation area, the engagement pin and the engagement hole are engaged with each other, and the highly rigid engagement pin is tilted to engage the periphery of the engagement hole The engagement hole is elastically deformed in the direction of expanding the opening dimension by the action of the elastic deformation inducing portion when the portion closer to the base end side than the engagement claw non-formation region of the claw non-formation region or the shaft portion is pressed, The engagement claw non-formation area can be removed from the engagement hole, and the engagement pin can be tilted or counter-inserted When pulling the force acts, the engaging claw forming region subsequent to the engagement claws formed area also deviate exit the engaging hole can be removed disconnect the entire engaging pin from the engaging hole.
Further, the engagement pin is integrally provided at the outer edge portion of the outer shell or a portion near the outer edge portion, and the outer edge portion of the outer shell or the portion near the outer edge portion is gripped in a state where the engagement pin is engaged with the engagement hole. Since the engagement pin is reliably tilted by being bent and deformed in the direction of pulling away from the inner shell, the engagement state between the engagement pin and the engagement hole is released. The disassembly work can be performed smoothly and easily.

  Therefore, according to the present invention, after the resin members are once assembled together, the engagement force between the engagement claw and the engagement hole can be reduced when the assembled state has to be released such as parts replacement or maintenance. Excessive pulling force and pulling force exceeding are not required, and the disassembly work of the resin members can be performed smoothly. In addition, it is possible to avoid a sudden pulling force from acting on the engaging pin, and to prevent the engaging claw and thus the engaging pin itself from being damaged.

In particular, the tilting means tilts the outer shell itself, so that the engagement pin itself is positioned at a position proximal to the engagement claw non-formation region of the engagement claw non-formation region or the shaft portion. As long as it hits the periphery of the engagement hole and presses the periphery and tilts to an angle at which the non-engagement claw forming region is removed from the engagement hole, there is no need to provide a dedicated tilt mechanism on the outer shell , and the structure is simplified. Can be achieved.

  Even when a force pulling the engagement pin in the anti-insertion direction is applied in a state where the engagement pin and the engagement hole are engaged with each other, the engagement pin is unexpectedly moved from the elastic deformation inducing means of the engagement hole. In order to prevent disengagement, in the state where the engagement pin is engaged with the engagement hole, the end of the engagement claw, in other words, the engagement claw formation region and the engagement claw non-formation What is necessary is just to set so that the step part in the boundary part with an area | region and the said elastic deformation induction part of the said engagement hole may not line up on the same straight line.

In this case, in order to be able to perform the operation of warping the seat back cover required when tilting the portion of the outer shell where the base end portion of the engagement pin is tilted, a corner of the outer shell is used. The engagement pin may be integrally provided at a portion near the corner or the corner.

Further, in order to meet the requirements of the mold design to be used in the case of integrally molding a plurality of engaging pins to the outer shell, the outer shell of each of the engagement pins in each corner portion or each corner near the site It is preferable that the engagement pins that are provided integrally and face in the left-right width direction are provided so that the engagement claw forming regions face each other inward. Such a structure will be engaging claw formed area of each engaging pin is provided on the outer edge of the outer shell, when applying the operating force divert the direction of separating the outer shell from the inner shell, relatively The effect of being able to efficiently perform an operation of pressing a portion of the engagement claw non-formation region or shaft portion located on the outer edge side with a portion closer to the base end side than the engagement claw non-formation region against the periphery of the engagement hole. Can also be obtained.

If the outer shell is provided with a plurality of the engagement pins, and the inner shell is provided with the same number of the engagement holes as the engagement pins, a plurality of engagements are provided between the outer shell and the inner shell. A joint point can be secured and a stable assembly state of the outer shell and the inner shell can be maintained.

  As described above, according to the present invention, resin members can be easily assembled together by inserting a highly rigid engaging pin into an elastically deformable engagement hole, and once assembled. When disassembling the resin members, an excessive pulling force is not required to release the engagement state between the engagement pin and the engagement hole, and the engagement pin is prevented from being unexpectedly damaged. It is possible to provide an assembly structure of resin members capable of suitably releasing the engagement with the engagement hole.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, the assembly structure of the resin members according to the present invention has a seat back cover 9 (corresponding to the “first resin member” of the present invention) and the seat shell 31 ( This is applied to the assembly structure corresponding to the “second resin member” of the present invention. In addition, when the seat back cover 9 and the seat shell 31 are regarded as a shell structure that can be assembled to each other, the seat back cover 9 serves as an outer shell, and the seat shell 31 serves as an inner shell.

  As shown in FIGS. 1 and 2 (FIG. 2 is a diagram in which the central cross section of the chair 1 shown in FIG. 1 is partially omitted), the chair 1 has a leg 2, a seat 3, A support base 4 disposed below the seat 3, a back support rod 5 having a lower end pivoted on the rear side of the support base 4, and a backrest 6 attached to the back support rod 5 are provided. The chair 1 of the present embodiment has a back tilt function in which the backrest 6 tilts backward in accordance with the backward tilting motion of the back support rod 5, while the synchro tilt function in which the seat 3 interlocks with the backward tilting motion of the backrest 6. Is not something.

  The leg body 2 includes a plurality of leg blades 21 having casters and a single leg strut 22, and a gas cylinder (illustrated) as a seat lifting mechanism for lifting the seat 3 inside the cylindrical leg strut 22. (Omitted). That is, the leg support 22 functions as a gas cylinder cover member that covers the gas cylinder.

  As shown in FIG. 3 which is an enlarged view of a main part of FIGS. 2 and 2, the leg column 22 includes an upper cylindrical body 221 and a lower cylindrical body 222 that form a telescope shape, and an upper cylindrical body 221. And a cap member 223 that can be fitted to the upper end portion. Here, a fitting structure between the upper cylindrical body 221 and the cap member 223 will be described.

  The upper cylindrical body 221 is configured such that the diameter is gradually increased from the lower side to the upper side and the entire outer peripheral surface is set in a tapered shape, and a step portion 221a thinner than other regions is formed at the upper end portion. ing.

  On the other hand, the cap member 223 has a substantially disc shape, has a holding hole 223a that allows the upper end of the gas cylinder to be inserted and can hold the inserted gas cylinder at the center, and The outer edge portion has a fitting portion 223b that can be fitted to the stepped portion 221a. The fitting portion 223b has a concave groove shape that has an inner facing wall 223ba and an outer facing wall 223bb that are opposed to each other in the radial direction, and a connection portion 223bc that connects the upper ends of these facing walls 223ba and 222bb, and opens only downward. Is. The inner dimensions of the inner facing wall 223ba and the outer facing wall 223bb are set to be substantially the same as or slightly larger than the thickness dimension of the step portion 221a.

  Such attachment of the upper cylindrical body 221 and the cap member 223 is performed by fitting the fitting portion 223b of the cap member 223 to the step portion 221a of the upper cylindrical body 221 as shown in FIG. Do. In the fitted state (see FIG. 3B), the stepped portion 221a is sandwiched between the inner side and the outer side by the inner facing wall 223ba and the outer facing wall 223bb of the fitting portion 223b. Furthermore, in this embodiment, the diameter of the fitting portion 223b, specifically, the inner diameter of the outer facing wall 223bb is set slightly smaller than the outer diameter of the step portion 221a. By pressing the joint portion 223b into the tapered step portion 221a, the step portion 221a is sandwiched while being pressed between the inner facing wall 223ba and the outer facing wall 223bb of the fitting portion 223b. The stepped portion 221a and the fitting portion 223b are configured to be able to maintain a stronger fitting state over a long period of time. In addition, the convex part which protrudes outward or inward continuously is provided in at least one of the outward surface or the inward surface of the step portion 221a in the circumferential direction, and the inward surface of the outer facing wall 223bb or the outward direction of the inner facing wall 223ba. A concave portion that can be engaged with the convex portion is continuously provided in at least one of the surfaces in the circumferential direction, and the convex portion and the concave portion that face each other are engaged when the fitting portion 223b is fitted to the step portion 221a. You may comprise. Of course, a mode in which the relationship between the convex portion and the concave portion is reversed, that is, a mode in which the concave portion is provided in the stepped portion 221a and the convex portion is provided in the fitting portion 223b may be employed.

  Since the gas cylinder is a well-known one, a detailed description is omitted. The gas cylinder is arranged inside the leg column 22 and the vicinity of the upper end thereof is inserted into the holding hole 223a of the cap member 223 and is held by being pressed by the base end portion of the operation lever 7 described later. A simple head is positioned above the cap member 223.

  As shown in FIGS. 1 and 2, the seat 3 includes a seat shell 31 that is a shell structure, a seat cushion material 32 disposed above the seat shell 31, and a seat surface cover that can cover the seat cushion material 32. 33. Details of the seat shell 31 will be described later.

  The support base 4 is a seat shell as shown in FIGS. 2, 4 and 5 (FIG. 5 is a rear view of the support base 4 with the back support rod 5 and the operating lever 7 pivoted). 31, a support base body 41 positioned in the center region in the left-right width direction, an elbow support portion 42 attached to both left and right sides of the support base body 41, and a leg attached to the lower surface of the support base body 41. A support post 43 is provided.

  The support base body 41 includes a base portion 411 that gradually tilts upward at a gentle angle toward the front and a base portion 411 toward the rear, with a position closer to the rear side than the middle portion in the front-rear direction (longitudinal direction). It is a steel integrated product integrally provided with a reaction force receiving portion 412 that gradually inclines upward at a steeper angle and receives a reaction force associated with the backward inclination of the back support rod 5 (see FIG. 2). Note that the reaction force mechanism X that generates a tilting force (reaction force) that tilts the back support rod 5 to a standing posture with the back tilt of the back support rod 5 uses a spring spring (not shown), and the seat 3 The degree of tilting power (reaction force) that causes the back support bar 5 to tilt to the upright position as the back support bar 5 is tilted backward by operating the operation knob X1 (see FIG. 1) disposed below the rear side. The well-known thing which can adjust can be applied, and detailed explanation is omitted. The support base body 41 includes ribs 41 a extending along the front-rear direction in the left and right side edges or in the vicinity of the left and right side edges. In the present embodiment, ribs 41a that are substantially mountain-folded when viewed from the front are applied. The support base body 41 has high rigidity due to the ribs 41 a provided continuously from the base portion 411 to the reaction force receiving portion 412. The base portion 411 has a seat shell mounting portion 411a in which a seat shell mounting hole used for mounting to the seat shell 31 is formed outside the rib 41a, and an elbow support is provided on a part of the seat shell mounting portion 411a. An elbow support mounting portion 411b for mounting the portion 42 is formed (see FIG. 4). The seat shell mounting portion 411a is inclined upward and gradually forward at the same angle as the base portion 411, while the elbow support mounting portion 411b extends horizontally in the front-rear direction. In this way, by setting the elbow support mounting portion 411b to be horizontal, the same elbow support portion 42 can be attached to either the left or right elbow support mounting portion 411b. With such a configuration, if the elbow support attaching part 411b is inclined to the front and gradually upward at the same angle as the base part 411, that is, it is necessary to correspond to the inclination angle of the elbow support attaching part 411b. This eliminates the problem that the left and right elbow support mounting portions 411b cannot be shared.

  The elbow support part 42 is made of steel that is fixed to the lower surface of the elbow support attachment part 411b and the side surface of the leg support part 43 by welding, for example. The elbow support 42 is held in a posture that gradually rises outward.

  The leg strut receiving portion 43 has a generally upward U-shape that opens in the front-rear direction and upward, and is made of steel that is fixed to a region extending from the rear side of the base portion 411 and the front side of the reaction force receiving portion 412 by, for example, welding. (See FIGS. 2 and 5). A cylindrical portion 431 through which the upper end portion of the gas cylinder and the head that can project and retract can be inserted in a portion of the leg strut receiving portion 43 that is positioned on the rear side of the base portion 411. The cylindrical portion 431 penetrates the base portion 411 and is positioned at a position where the head of the gas cylinder faces the opening of the cylindrical portion 431. The base end portion of the operation lever 78 for operating the gas cylinder is also positioned at a position facing the opening of the tubular portion 431 so that the operation lever 7 can press the head of the gas cylinder.

  The operation lever 7 includes a lever main body 71 pivotally supported by the support base 4 in the vicinity of the base end portion so as to be rotatable around a horizontal axis in the front-rear direction, and a handle 72 made of a synthetic resin attached to the distal end portion of the lever main body 71. It is equipped with. Note that “rotation about the horizontal axis in the front-rear direction” used in the description of the operation of the operation lever 7 means “rotation in the height direction about the horizontal axis extending in the front-rear direction”.

  The lever main body 71 is a metal rod-shaped member, and a first linear portion 711 disposed below the support base 4 and a first cylinder portion 711 disposed above the support base 4 and capable of pressing the head of the gas cylinder from above. Lever insertion hole provided between the two linear portions 712, the first linear portion 711, and the second linear portion 712 and formed in the support base 4 (specifically, the inner side of the elbow receiving portion 42) The first lever insertion hole 42a formed at the end and the bent portion 713 passed through the second lever insertion hole 41aa formed in one rib 41a of the support base body 41 are continuously provided.

  The handle 72 is made of a synthetic resin having a flat tip portion, and is attached to the tip portion of the lever main body 71 with a screw or the like. By the operation of moving the handle 72 in the vertical direction, the operation lever 7 has a pressing position where the base end portion of the lever body 71 (the base end portion of the second linear portion 712) presses the head of the gas cylinder, and the gas It rotates around the horizontal axis in the front-rear direction between the non-pressing position where the head of the cylinder is not pressed.

  As shown in FIGS. 2, 4, and 5, the back support rod 5 is provided between a pair of left and right backrest frame bodies 51 and the backrest frame bodies 51 and receives a spring spring of the reaction force mechanism X. The spring receiving portion 52 is integrally provided.

  The pair of left and right backrest frame bodies 51 are arranged so that the front portions thereof are located below the base portion 411, are curved upward and rearward from the rear end portion of the seat 3, and are extended to the portions extending upward. A backrest attaching portion 53 for attaching the turn 6 is integrally provided. The backrest 6 can be attached to the back shell, the back cushion material (not shown) arranged in front of the back shell, the backrest surface cover 61 that can cover the back cushion material, and the back of the back shell. The back cover 62 is provided (see FIG. 1).

  A lower end portion (base end portion) of each backrest frame body 51 is arranged at a position sandwiching a portion of the leg strut receiving portion 43 that is positioned on the front side of the reaction force receiving portion 412 from both sides, in the lateral width direction. It is pivotally supported on the support base 4 by a back support rod rotating shaft 5x which is a horizontal axis (see FIGS. 2 and 5). The back support shaft rotating shaft 5x may be a single shaft that communicates with the pair of left and right backrest frame bodies 51. However, in the present embodiment, as an aspect provided individually for each backrest frame body 51, Yes. Of course, the pair of shafts are positioned on the same straight line in the lateral width direction of the seat. Further, in each backrest frame body 51 pivotally supported by the support base 4, the lower end side region disposed below the support base main body 41 is provided on the left and right sides provided in the support base main body 41 as shown in FIG. 15. It is positioned directly below or approximately directly below the pair of ribs 41a.

  As shown in FIGS. 2 and 6 (FIG. 6 is an enlarged view of the main part of FIG. 2 and a part of the back support bar 5 is shown in a partially omitted state), as shown in FIGS. Of the drooping frame body 51, the steel plate is disposed at a position behind the pivot point (back support shaft rotating shaft 5x) and ahead of the bent portion, and the substantially flat steel material faces substantially downward. It is bent into a U shape. At the front end portion of the spring receiving portion 52, the support base portion 4 (specifically, when the back support rod 5 is tilted rearward with respect to the support base portion 4, located slightly below the downward surface of the backrest frame body 51. Is provided with a contact portion 521 that can come into contact with the rear end portion of the leg strut receiving portion 43. The contact portion 521 has a tongue-like shape extending forward from the lower end of the forward facing surface 522 of the spring receiving portion 52, and is provided with an upward convex portion 521a protruding upward (see FIG. 6, FIG. 6). A pattern is given to a part of the upward convex portion 521a). In the present embodiment, the pair of upward convex portions 521a are provided so as to be separated from each other on the left and right.

  Of the portion near the lower end of the back support rod 5, the portion exposed to the outside is covered with a back support rod cover 8.

  As shown in FIGS. 2 and 4 to 7, the back support rod cover 8 includes a substantially cylindrical cover main body 81 having a back support rod insertion hole 81 a for inserting the back support rod 5, and a back support rod. 5 and a buffer cover 82 that contacts the support base 4 in preference to the contact portion 521 when the back support 5 is tilted backward. The back support rod cover 8 is an integrally molded product made of, for example, a synthetic resin material. 4 shows a state in which the back support rod 5 from which the back support rod cover 8 to be originally attached is removed is pivotally supported by the support base 4, and the back support rod cover itself is shown as a single perspective view. It shows.

  The back support rod insertion hole 81a of the cover body 81 has a substantially rectangular shape that is wide in the left-right width direction, and is an opening that can accommodate the pair of backrest frame bodies 51 of the back support rod 5 with some play. Set to dimensions. On the bottom surface of the cover main body 81, a cylindrical collar portion 81 b that communicates with the spring receiving portion 52 of the back support rod 5 while being attached to the back support rod 5 is provided.

  The buffer cover 82 is continuous with the front end portion of the upper surface of the cover body 81, and is disengaged from the back support rod insertion hole 81a when viewed from the opening direction of the back support rod insertion hole 81a. The non-mounting position (82A) (see FIG. 7 (c)), which is an open position, and the back support rod insertion hole 81a as viewed from the opening direction of the back support rod insertion hole 81a, can be attached to the contact portion 521. It can be rotated between the appropriate mounting position (82B) (see FIG. 7B). In the present embodiment, the connecting portion between the cover main body 81 and the buffer cover 82 is made thin or partially cut away so as to function as a hinge portion. The left and right width dimensions of the buffer cover 82 are set smaller than the inner method between the backrest frame bodies 51 (see FIG. 5).

  In order to attach the back support rod cover 8 to the back support rod 5, first, the back support rod 5 is inserted into the back support rod insertion hole 81a in a state where the buffer cover 82 is positioned at the non-mounting position (82A). The buffer cover 82 inserted in the vicinity of the lower end portion of the back and rotated from the non-mounting position (82A) to the mounting position (82B) hits the abutting portion 521 or the front surface 522 of the spring receiving portion 52 of the back support rod 5. The buffer cover 82 is moved until the tip end portion of the buffer cover 82 is pressed against the contact portion 521 from the front side. The front end portion of the buffer cover 82 has a shape that sandwiches the contact portion 521 from above and below, and can be fitted to the upward convex portion 521a provided in the contact portion 521 at the front end portion of the buffer cover 82. A fitting hole 82a is provided (see FIGS. 4 and 7). The fitting hole 82a can be press-fitted with an upward convex portion 521a having a substantially hemispherical shape. Then, by attaching the tip of the buffer cover 82 to the contact portion 521, the relative mounting position of the back support rod 5 and the back support rod cover 8 is positioned, and the back support rod 5 is positioned within the back support rod cover 8. By preventing the wobbling and press-fitting the upward convex portion 521a into the fitting hole 82a, the fitting state of the buffer cover 82 with respect to the contact portion 521 becomes better. In the present embodiment, the buffer cover 82 is positioned by its own weight at the mounting position (82B) or between the mounting position (82B) and the non-mounting position (82A). In a state where the back support rod cover 8 is attached to the back support rod 5, the back support rod cover 8 is positioned behind the pivot point 5 </ b> X of the back support rod 5 with respect to the support base 4.

  The back support rod 5 with the back support rod cover 8 attached in the vicinity of the lower end portion is pivotally attached to the support base portion 4, and the support base portion 4 is fixed to the back side of the seat shell 31 using a fixing means such as a screw. . In the present embodiment, the seat back cover 9 is attached from the lower surface side of the seat shell 31 with the operation lever 7 pivotally supported by the support base 4.

  2, 8 and 9 (FIG. 8 (a) is a bottom view of the seat shell 31, FIG. 8 (b) is an enlarged view of the P region of FIG. 9 (a), and FIG. 8 (a) is a cross-sectional view taken along line aa), and is made of a synthetic resin having a substantially thin plate shape, and has a three-dimensional shape in which a central region is recessed from an outer edge portion. The seat shell 31 of the present embodiment is an integrally molded product. The seat cushion material 32 is configured to be mountable on the upper surface of the seat shell 31, and the support base 4 is configured to be attachable to the lower surface. In addition, from the viewpoint of reducing the weight and rigidity of the seat shell 31, one or a plurality of through holes penetrating in the thickness direction are provided at appropriate places (in the central portion region in the illustrated example), and the front and rear direction and the left and right widths are provided on the lower surface portion. A plurality of ribs extending in the direction are provided. Further, a substantially cylindrical engagement hole 311 opened downward is provided in the vicinity of each corner of the seat shell 31. Each engagement hole 311 penetrates in the thickness direction of the seat shell 31, in other words, in the height direction of the seat 3, and the slit 311 b which is an elastic deformation inducing portion of the present invention extending along the height direction to the peripheral edge 311 a. (See FIG. 8B). In the present embodiment, a pair of slits 311b are formed so as to face a portion that bisects a cylindrical peripheral edge 311a. In particular, the engagement hole 311 of the present embodiment forms a slit 311b at a portion of the peripheral edge 311a that faces the seat 3 in the left-right width direction. The engagement hole 311 having such a slit 311b is elastically deformed through the normal opening state (see FIG. 9A) that is not elastically deformed and the opening operation of the slit 311b, and the opening size is an opening in the normal opening state. It is elastically deformed between the expanded state (see FIG. 9B) that is larger than the dimension. In addition, each engagement hole 311 is provided with a tapered engagement protrusion 311c along the circumferential direction that gradually decreases the inner method from the opening side (downward) to the back (upward) at the opening edge of the peripheral edge 311a. ing. The seat shell 31 is formed with an operation lever interference avoidance hole 312 for avoiding interference with the base end portion of the operation lever 7.

  The seat back cover 9 is shown in FIGS. 2, 10, and 11 (FIG. 10 (a) is a plan view of the seat back cover 9, and FIG. 10 (b) is an enlarged view of the Q region in FIG. 10 (a)). Thus, it is a thing made from the synthetic resin which makes a substantially thin plate shape, and can coat | cover the lower end part side area | region of the seat shell 31, the support base 4, and the back support rod 5 from the downward direction. The seat back cover 9 of the present embodiment is an integrally molded product. An opening 91 through which the upper end of the leg support 22 of the leg 2 can be inserted is provided at the center of the seat back cover 9. The opening 91 includes a gas cylinder hole 911 for attaching a gas cylinder disposed in the leg 2, and an operation lever hole for continuing to the gas cylinder hole 911 and avoiding interference with the operation lever 7. 912. The gas cylinder hole 911 has a substantially circular shape, and the operation lever hole 912 is a long hole extending in the left-right width direction from one side of the gas cylinder hole 911. The support base accommodating portion that can mainly accommodate the leg strut receiving portion 43 of the support base 4 attached to the seat shell 31 by recessing the region where the opening 91 is provided and the peripheral region below the other region. It is set to function as 92. A cutout portion 93 for avoiding interference with the back support rod cover 8 is provided in a central region in the left-right width direction on the rear end side of the seat back cover 9 and continuing to the support base housing portion 92. Further, in the vicinity of both side edges of the seat back cover 9, an elbow support in which a screw insertion hole is formed which is in contact with or close to the bottom surface of the elbow receiving portion 42 of the support base 4 and through which a screw for attaching the elbow H can be inserted. A part backing part 94 is provided. And the engagement pin 95 is integrally provided in each corner part vicinity site | part of this seat back cover 9, respectively.

  As shown in FIG. 10B, each engagement pin 95 is mainly composed of a cylindrical shaft portion 951, and an engagement claw 952 that protrudes laterally from the tip portion of the shaft portion 951 is provided. The engaging claw forming region 95A and the engaging claw non-forming region 95B not provided with the engaging claw 952 are divided into two around the axis. The engaging claw 952 has a tapered shape with a gradually decreasing diameter toward the tip. The outer diameter dimension of the shaft portion 951 is set slightly smaller than the inner diameter method of the opening edge of the engaging hole 311 in the normal opening state, and the maximum outer diameter dimension in the engaging claw forming region 95A is set to the normal opening. It is set to be substantially the same as the in-opening method in the region above the engagement protrusion 311c in the peripheral edge 311a of the engagement hole 311 in the state. In the present embodiment, the tip end portion of the shaft portion 951 is substantially equally divided into an engaging claw forming region 95A and an engaging claw non-forming region 95B, and the engaging claw forming region 95A and the engaging claw non-forming region 95B are divided. 95C, in other words, both end portions of the engaging claw 952 are positioned on substantially the same straight line in plan view. In particular, in the present embodiment, the step portion 95C, which is a boundary portion between the engaging claw forming region 95A and the engaging claw non-forming region 95B, is set at a location facing the seat 3 in the front-rear direction. More specifically, each engagement pin 95 provided in the vicinity of the four corners of the seat back cover 9 has an engagement claw forming region 95A facing inward in relation to the engagement pin 95 facing in the left-right width direction. They are set to face each other. That is, each engagement pin 95 sets an inward half-circumferential region near the center in the left-right width direction of the seat back cover 9 in the front end portion of the shaft portion 951 as the engagement claw forming region 95A, and the outward side A half-circumferential region (outer edge side of the seat back cover 9) is set as an engagement claw non-formation region 95B. The base end portion of each engagement pin 95 is provided continuously with a highly rigid mounting base portion 96 that protrudes upward from the upward surface of the seat back cover 9. The mounting base 96 includes a hollow box portion 961 and one or a plurality of ribs 962 provided inside the box portion 961, and the upper surfaces of the mounting base portions 96 are all parallel and smooth surfaces. The protruding directions of the mating pins 95 are parallel to each other, and the base end positions of the engaging pins 95 are the same. When the seat back cover 9 is bent and deformed so that the vicinity of the portion where the mounting base 96 is provided is curved, the mounting base 96 is tilted according to the bending state of the seat back cover 9, and the engagement pin 95 is accordingly moved. It is inclined at the same angle as the inclination of the mounting base 96.

  Next, the procedure and operation for assembling the seat shell 31 and the seat back cover 9 together will be described.

  Before assembling the seat shell 31 and the seat back cover 9, the lower end portion of the back support rod 5 to which the back support rod cover 8 is attached in advance is pivotally supported in the vicinity of the rear end portion of the support base portion 4. The base end portion of the operation lever 7 is pivotally supported, and such a support base portion 4 is fixed to the lower surface of the seat shell 31.

  Then, as shown in FIGS. 12 and 13, with the lower surface of the seat shell 31 facing upward (inverted state), the seat back cover 9 is passed through the opening 91 and the operation lever 7 to the lower surface side of the seat shell 31. The engagement pins 95 are pressed into the respective engagement holes 311 of the seat shell 31 and inserted. When the operation lever 7 is passed through the opening 91 of the seat back cover 9, if the operation lever 7 is rotated in a direction in which the distal end portion (the handle 72) is separated from the seat shell 31, the distal end portion of the operation lever 7. The distance between the side region, the seat shell 31 and the support base 4 can be greatly increased, and the operation of passing the operation lever 7 through the opening 91 can be performed more easily. The operating lever 7 shown in FIG. 12 is not in a state where the tip end (the handle 72) is rotated in a direction away from the seat shell 31, but is in the same posture as that shown in FIG.

  As the engaging pin 95 is inserted into the engaging hole 311, the engaging claw forming region 95 </ b> A presses the inwardly tapered engaging protrusion 311 c provided at the opening end of the peripheral edge 311 a, and this pressing force As a result, the slit 311b is pushed and expanded so that the engagement hole 311 is elastically deformed in the direction of expanding the opening dimension, and the engagement claw forming region 95A is inserted into the engagement hole 311 by inserting the engagement pin 95. At this point, the engagement hole 311 is elastically restored to the normal open state, and as shown in FIGS. 14, 15 and 16A, the engagement claw of the engagement pin 95 is formed. The region 95A engages with the engagement protrusion 311c of the engagement hole 311. 14 shows a state in which the seat back cover 9 is assembled to the seat shell 31 in a cross section corresponding to the cross section taken along the line bb of FIG. 10, and FIG. 15 shows the seat back cover 9 on the seat shell 31. The assembled state is shown by a cross section corresponding to the cross section taken along the line cc of FIG. 10, and FIG. 16 (a) is a partially enlarged view of FIG. In the present embodiment, the direction in which the pair of slits 311b provided in each engagement hole 311 faces is set substantially parallel to the lateral width direction of the seat 3, whereas the end of the engagement claw 952, that is, the engagement. Since the direction in which the pair of stepped portions 95C, which are the boundary portion between the engaging claw forming region 95A and the engaging claw non-forming region 95B, faces is set substantially parallel to the front-rear direction of the seat 3, the engaging pin 95 is engaged. In the engaged state engaged with the joint hole 311, the step portion 95 </ b> C of the engagement claw 952 and the slit 311 b of the engagement hole 311 are not aligned on the same straight line but are substantially orthogonal to each other. As a result, even when a force that pulls the engagement pin 95 straight in the anti-insertion direction is applied in the engaged state, the engagement claw forming region 95A is caught by the engagement protrusion 311c of the engagement hole 311 and the engagement pin 95 is prevented from coming off from the engagement hole 311.

  Thus, the engagement pin 95 and the engagement hole 311 function as the engagement mechanism K used when the seat back cover 9 and the seat shell 31 are attached to each other. It can be attached to the seat shell 31. That is, the seat back cover 9 and the seat shell 31 can be assembled to each other when the engagement mechanism K is in an engaged state in which the engagement pin 95 and the engagement hole 311 are engaged with each other.

  In the state where the seat back cover 9 and the seat shell 31 are assembled to each other by the engagement mechanism K, the gas cylinder hole 911 in the opening 91 of the seat back cover 9 and the leg strut receiving portion 43 of the support base 4 When the leg column 22 that communicates with the cylindrical portion 431 in the height direction and the gas cylinder is disposed therein is inserted into and attached to the gas cylinder hole 911 and the cylindrical portion 431, the head of the gas cylinder is attached. The support base 4 is positioned at a position facing the cylindrical portion 431. In addition, a region near the base end of the operation lever 7 (specifically, a bent portion 713 of the lever main body 71) is positioned in the operation lever hole 912 in the opening 91 of the seat back cover 9, and the inside of the operation lever hole 912. The lever main body 71 is allowed to rotate between the pressing position and the non-pressing position.

  On the other hand, the mounting structure of the resin members of this embodiment in which the engagement pin 95 is engaged with the engagement hole 311 and the seat back cover 9 is attached to the seat shell 31 is the engagement pin 95 of the seat back cover 9. By tilting the portion where the base end portion of the engaging pin 95 is tilted, the engaging pin 95 itself can be tilted to an angle at which the engaging claw non-forming region 95B can hit the peripheral edge 311a of the engaging hole 311 and press the peripheral edge 311a. The engagement state between the engagement pin 95 and the engagement hole 311 is released using the means.

  By tilting and deforming the seat back cover 9 itself, the tilting means causes the highly rigid engaging pin 95 itself to contact the engaging claw non-forming region 95B against the peripheral edge 311a of the engaging hole 311 so that the engaging hole 311 is formed by the slit 311b. It is expanded using elastic deformation and tilted to an angle at which the engagement claw non-formation region 95 </ b> B comes out of the engagement hole 311. In the present embodiment, by applying a force to warp the portion of the seat back cover 9 in which the base end portion of the engagement pin 95 is provided in the direction away from the seat shell 31, the mounting base 96 is warped (the seat back). The engagement pin 95 is inclined in the engagement hole 311 in synchronization with the inclination of the attachment base 96. Specifically, as shown in FIG. 16 (b), the engagement pin 95 itself has a highly rigid structure that cannot be elastically deformed or suppressed, and such an engagement pin 95 can be flexibly deformed. By providing the seat back cover 9 integrally, a portion of the seat back cover 9 where the base end portion of the engagement pin 95 is provided, that is, a portion where the mounting base portion 96 is provided is separated from the seat shell 31. By applying the operation force to warp, the engaging pin 95 is tilted in the engaging hole 311 according to the tilting of the mounting base 96, and the engaging claw non-formation region 95 </ b> B of the engaging pin 95 causes the peripheral edge 311 a of the engaging hole 311 to move. The engaging hole 311 receives the pressing force and is elastically deformed in the direction of expanding the opening size by the action of the slit 311b to be in the expanded state. In this embodiment, the engagement claw non-formation region 95 </ b> B of the engagement pin 95 presses the peripheral edge 311 a of the engagement hole 311, and the engagement claw formation of the shaft portion 951 of the engagement pin 95 is performed. A region closer to the base end than the region 95A and the engagement claw non-formation region 95B presses the engagement protrusion 311c of the peripheral edge 311a. Thereby, the engagement hole 311 can be more smoothly shifted from the normal opening state to the expanded state. Further, in the present embodiment, the engagement pin 95 divides the tip end portion of the shaft portion 951 into the engagement claw formation region 95A and the engagement claw non-formation region 95B around the axis. In a state in which the engagement pin 3 is engaged, a space allowing the tilt of the engagement pin 95 is provided between the engagement claw non-formation region 95B of the engagement pin 95 and the peripheral edge 311a of the engagement hole 311. It is formed (see FIG. 16A). In the present embodiment, the engagement claw forming area 95A and the engagement claw non-formation area 95B are within the engagement hole 311 when the engagement pin 95 is engaged with the engagement hole 311. If the claw formation region 95A and the engagement claw non-formation region 95B do not fit in the engagement hole 311 and protrude upward from the upper surface of the seat shell 31, that is, the problem that occurs, that is, the engagement claw formation region 95A and the engagement claw For example, it is possible to avoid the problem that the non-claw forming area 95B is buried in the seat cushion material 32, for example, and the engagement pin 95 itself cannot be tilted or the engagement pin 95 cannot be tilted smoothly.

  Subsequently, as shown in FIG. 16C, an operation force that further warps the seat back cover 9, or a direction opposite to the insertion direction when the engagement pin 95 is engaged with the engagement hole 311 (anti-insertion direction). When the pulling operation force is applied, at least a part of the engagement claw formation region 95A of the engagement pin 95 is removed from the engagement hole 311 in the expanded state following the engagement claw non-formation region 95B of the engagement pin 95. The remaining engagement claw forming region 95A that is still engaged with the engagement hole 311 triggered by the part that has been partially removed is gradually or at a stroke by continuing to apply the same operating force. The engagement state between the engagement pin 95 and the engagement hole 311 is released. In the present embodiment, since the engagement pins 95 provided in the vicinity of the corner portions of the seat back cover 9 are engaged with the engagement holes 311 of the seat shell 31, The seat back cover 9 can be separated from the seat shell 31 by sequentially disengaging the engagement mechanisms K including the engagement pins 95 and the engagement holes 311 by the above-described operation.

  In particular, in the present embodiment, since the engagement pin 95 is integrally provided in the vicinity of each corner portion of the seat back cover 9, the engagement pin 95 is a portion corresponding to the side portion of the seat back cover 9 or the center portion. Compared with the case where it is provided in the vicinity, the operation of warping the seat back cover 9 required when the part of the seat back cover 9 provided with the base end portion of the engagement pin 95 is tilted can be performed with a relatively light force. it can.

  As described above, the engagement mechanism K including the engagement pin 95 and the engagement hole 311 allows the operator to place the seat back cover 9 in a state where the engagement pin 95 and the engagement hole 311 are engaged with each other. The engagement portion 95 is tilted in the engagement hole 311 by causing the vicinity of the corner of the corner portion to warp away from the seat shell 31, and the engagement claw non-forming region 95 </ b> B is pulled out of the engagement hole 311. In this initial state of disengagement, the entire engagement pin 95 is removed from the engagement hole 311 by further warping or pulling the seat shell 31 in the direction of separating the engagement pin 95 from the engagement hole 311. The engagement is released.

  Thus, the mounting structure of the resin members according to the present embodiment has a force that pulls the engagement pin 95 in the anti-insertion direction in a state where the engagement pin 95 is inserted into the engagement hole 311 and engaged. Even if it acts, the engagement claw forming region 95A of the shaft portion 951 of the engagement pin 95 is caught by the engagement protrusion 311c of the engagement hole 311 and the engagement pin 95 is detached from the engagement hole 311. In addition to being able to prevent, the tip of the shaft portion 951 of the engagement pin 95 is divided into the engagement claw formation region 95A and the engagement claw non-formation region 95B around the shaft, so that the engagement pin 95 and the engagement hole In a state where the 311 is engaged with each other, a space allowing the tilting of the engaging pin 95 is formed between the engaging claw non-forming region 95 </ b> B of the engaging pin 95 and the peripheral edge 311 a of the engaging hole 311. The engagement pin 95 is engaged with the engagement hole by using the tilting means. 11, the engaging pin 95 having high rigidity is tilted to press the peripheral edge 311 a of the engaging hole 311, and the engaging hole 311 is elastic in the direction of expanding the opening dimension by the action of the slit 311 b. When the engaging claw non-formation region 95B is detached from the engagement hole 311 and a force for tilting the engagement pin 95 or pulling in the anti-insertion direction is applied, the engagement claw non-formation region 95B continues. The engaging claw forming region 95 </ b> A is also removed from the engaging hole 311, and the entire engaging pin 95 can be removed from the engaging hole 311.

  Therefore, after the seat back cover 9 and the seat shell 31 that are resin members are once assembled, the engagement claws 952 and the engagement holes 311 are required when the assembled state must be released for parts replacement or maintenance. Excessive pulling force and pulling force exceeding the engagement force with the seat shell 31 are not required, and the work of removing the seat back cover 9 from the seat shell 31 can be performed smoothly. In addition, it is possible to avoid a sudden pulling force from acting on the engagement pin 95, and to prevent the engagement claw 952 and thus the engagement pin 95 itself from being damaged.

  Particularly, when the tilting means tilts the seat back cover 9 itself, the engagement pin 95 itself is brought into contact with the periphery 311a of the engagement hole 311 by the engagement claw non-formation region 95B and presses the periphery 311a. Since it is tilted to an angle that allows it to come off, it is not necessary to provide a separate dedicated tilting mechanism for tilting the engagement pin 95 in the seat back cover 9, and the structure can be simplified.

  Further, in a state where the engagement pin 95 is engaged with the engagement hole 311, an end portion of the engagement claw 952, that is, a step portion at a boundary portion between the engagement claw formation region 95 </ b> A and the engagement claw non-formation region 95 </ b> B. 95C and the slit 311b of the engagement hole 311 are not aligned on the same straight line, so that even when a force pulling the engagement pin 95 in the anti-insertion direction is applied in the engaged state, the engagement is performed. The pin 95 can be prevented from unexpectedly coming off from the slit 311b of the engagement hole 311 and a good engagement state can be realized.

  Further, since the engagement pin 95 is integrally provided at the corner portion of the seat back cover 9 or a portion near the corner portion, it is necessary to tilt the portion of the seat back cover 9 where the base end portion of the engagement pin 95 is provided. The operation of warping the seat back cover 9 can be performed with a relatively light force, and the operation of removing the seat back cover 9 from the seat shell 31 can be performed smoothly and reliably.

  In addition, since the engagement pins 95 facing the lateral width direction of the seat 3 are provided so that the engagement claw forming regions 95A face each other inwardly, the plurality of engagement pins 95 are attached to the seat back cover 9. It is possible to make the seat back cover 9 having a plurality of engagement pins 95 as an integrally molded product that satisfies the design requirements when considering the pulling direction when making the mold used for integral molding. In addition, when the engagement claw non-formation region 95B of each engagement pin 95 is provided on the outer edge side of the seat back cover 9, an operation force that warps the seat back cover 9 away from the seat shell 31 is given. In addition, it is possible to efficiently perform an operation in which the engagement claw non-formation region 95 </ b> B positioned relatively on the outer edge side is pressed against the peripheral edge 311 a of the engagement hole 311.

  Furthermore, since a plurality of engagement pins 95 are integrally provided in the seat back cover 9, and the same number of engagement holes 311 as the engagement pins 95 are integrally provided in the seat shell 31, a plurality of engagement portions are secured. The stable attachment state of the seat back cover 9 and the seat shell 31 can be maintained.

  The present invention is not limited to the embodiment described in detail above.

  For example, the shaft portion of the engagement pin may be a solid cylindrical shape. Further, the engaging pin may be formed by dividing the tip end portion of the shaft portion into the engagement claw forming region and the engagement claw non-forming region around the axis, and the engagement pin occupies the engagement claw formation region occupied around the axis. It may be an aspect in which the ratio with the non-claw forming area is not uniform. For example, when the engagement claw formation region is set larger than the engagement claw non-formation region, a better engagement state can be secured, and conversely, that is, the engagement claw non-formation region is set to the engagement claw. When it is set to be larger than the formation region, the operation of removing the engagement pin from the engagement hole can be performed more smoothly.

  Moreover, although the seat back cover was applied as the first resin member and the seat shell was applied as the second resin member in the above embodiment, the first resin member and the second resin are exemplified. The manufactured member may be a thin plate-like shell structure (inner shell and outer shell) that can be assembled to each other, and the back shell is applied as the second resin member, and the back shell is used as the first resin member. You may apply the back cover which can be assembled | attached to a back side. For seat shells and back shells that do not have a cushion material on the top or front, an engagement pin is provided integrally with these seat shells and back shell, and an engagement hole is provided integrally with the seat back cover and back cover. Also good. That is, an aspect in which an engagement pin is provided in the inner shell and an engagement hole is provided in the outer shell may be employed.

  Further, the engagement pin may be provided integrally with the first resin member without using the attachment base.

  Of course, the number of engagement pins and engagement holes may be appropriately increased or decreased.

  Moreover, the aspect which provided integrally the engagement pin and the engagement hole in the site | part corresponded to a side part among the outer edge parts of each resin member may be sufficient.

  Further, a cutout may be applied instead of the slit as the elastic triggering portion of the engagement hole.

  The engagement hole may be a simple cylindrical member provided with an elastic inducing portion on the periphery, that is, the engagement protrusion of the above embodiment may not be provided. In this case, the engagement pin and the engagement hole are engaged with each other by the engagement claw of the engagement pin inserted into the engagement hole being caught by the opening edge on the opposite side of the engagement hole. Furthermore, the engagement hole is not a cylindrical one, and may be a simple through hole that penetrates in the thickness direction of the second resin member. In this case, a slit or notch is provided at the periphery of the through hole, and an engagement pin integrally provided in the first resin member is inserted into the through hole to engage the engagement claw, and the first resin member By tilting the portion where the base end portion of the engagement pin is tilted, the portion of the shaft portion closer to the base end side than the region where the engagement claw is not formed hits the periphery of the through hole and presses the periphery. In addition, the engagement state between the engagement pin and the engagement hole may be released using a tilting means that can be tilted to an angle at which the engagement claw non-formation region is removed from the engagement hole. .

  If the shaft portion of the engaging pin has a bottomed cylindrical shape or a cylindrical shape having an internal space accessible at least from the base end side, the tilting means moves from the base end side of the engaging pin to the internal space. For example, by inserting a tool such as a driver and tilting the first resin member itself, the shaft portion of the engagement pin is tilted, and the engagement pin itself is engaged with the engagement claw non-formation region or the shaft portion. A portion closer to the base end than the joint claw non-forming region may hit the peripheral edge of the engagement hole to press the peripheral edge, and may be inclined to an angle at which the engagement claw non-formation region comes out of the engagement hole.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 is an overall schematic view of a chair to which an assembly structure of resin members according to an embodiment of the present invention is applied. The figure which abbreviate | omits and shows some cross sections of the center part of the left-right width direction of the chair in the embodiment. The assembly explanatory drawing of the leg support in the embodiment. The perspective view of the state which pivotally supported the back support rod which is not equipped with the back support cover in the embodiment on the support base. The bottom view of the support base which made the back support rod equipped with the back support rod cover and the operation lever pivot in each embodiment. The figure which shows the state which the back support rod inclined backward in the same embodiment corresponding to a part of FIG. The figure which shows the back support rod cover in the same embodiment. The bottom view of the seat shell in the embodiment. The figure which shows the engagement hole in the same embodiment. The top view of the seat back cover in the embodiment. The whole figure of the seat back cover in the embodiment. The figure which shows one process of attaching a seat back cover to a seat shell in the embodiment. The bottom view of the state which attached the seat back cover to the seat shell in the embodiment. The figure which shows the state which assembled | attached the seat back cover to the seat shell in the embodiment in the cross section equivalent to the bb line cross section of FIG. The figure which shows the state which assembled | attached the seat back cover to the seat shell in the same embodiment by the cross section equivalent to the cc line cross section of FIG. Action explanatory drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Chair 31 ... 2nd resin member (seat shell)
311 ... engaging hole 311a ... peripheral edge 311b ... elastic deformation inducing part (slit)
9: First resin member (back cover)
95 ... engagement pin 951 ... shaft portion 952 ... engagement claw 95A ... engagement claw formation region 95B ... engagement claw non-formation region 95C ... engagement claw end (engagement claw formation region and engagement claw non-formation region) Step at the boundary with

Claims (6)

An engagement pin integrally provided on the outer edge or the outer edge vicinity portion of the outer shell, the first resin member, the engagement hole provided in the inner shell, the second resin member, the engagement hole It is an assembly structure of resin members configured to be able to assemble the resin members by engaging them using the elasticity of the periphery of the
The engaging pin is mainly composed of a columnar or cylindrical shaft part, and the engaging claw forming region provided with the engaging claw and the engaging claw are provided around the axis of the tip part of the shaft part. It is divided into a non-engagement claw non-formation region and is less elastically deformed compared to the periphery of the engagement hole ,
The engagement hole has a circular shape for externally fitting the engagement pin, and an elastic deformation inducing portion including a slit or a notch is provided on the periphery.
With the engaging pin inserted into the engaging hole and engaged, an operating force that warps the outer edge portion of the outer shell in a direction away from the inner shell is applied to the engaging pin itself. Utilizing tilting means capable of tilting the joint claw non-formation region or the shaft portion to the angle at which the base end side of the engagement claw non-formation region hits the peripheral edge of the engagement hole and can press the peripheral edge. An assembly structure of resin members, wherein the engagement state between the engagement pin and the engagement hole is released. When the tilting means tilts the outer shell itself, the engagement pin itself is placed on the engagement claw non-formation region or the portion of the shaft portion closer to the proximal end than the engagement claw non-formation region. 2. The assembly structure of resin members according to claim 1, which hits the peripheral edge of the joint hole and presses the peripheral edge and inclines to an angle at which the engagement claw non-formation region is detached from the engagement hole. An end portion of the engagement claw and the elastic deformation inducing portion of the engagement hole are not aligned on the same straight line in a state where the engagement pin is engaged with the engagement hole. Item 3. A mounting structure between resin members according to item 1 or 2. The mounting structure for resin members according to claim 1, 2, or 3 , wherein the engaging pins are integrally provided at a corner portion of the outer shell or a portion in the vicinity of the corner portion . The outer shell is provided integrally with each engaging pin at each corner portion or in the vicinity of each corner portion,
Influences the width engaging pin opposite the direction, the engaging pawl forming region mounting structure of the resin members to each other of which claims 1, 2, 3 or 4, wherein provided to face each other inwardly. 6. The resin according to claim 1, wherein the outer shell includes a plurality of the engagement pins, and the inner shell includes the same number of the engagement holes as the engagement pins. Mounting structure between manufactured members.

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