JP2011214591A - Fastening structure of stack member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform removing work of a fastening member with less labor efficiently and easily at releasing the fastening of surface side member and back surface side member using the separating operation of both the members.SOLUTION: On the back surface side member 5, locked parts 10, with which claw parts 9a of the fastening member 9 whose diameter is enlarged when the fastening member 9 is inserted into the locking holes 7, 8 of both members 5, 6 are locked and engaged; and a locking-release means B, which reduce the diameter of each locking claw 9A of the fastening member 9 being in a locked state at a predetermined fastening position into a locking release state, are provided. To structure the locking-release means B, the locked parts 10 are structured with a plurality of locked surfaces 10a formed intermittently at arrangement corresponding to the claw parts 9a of each locking claw 9A of the fastening member 9. On the back surface side member 5, a plurality of locking-release guide surfaces 17 are formed that reduce the diameter of each locking claw 9A into a locking-release state with the removal movement of the fastening member 9 accompanying the relative separating operation of both members 5, 6 using the position where each claw part 9a rotates between adjacent ones of the locked surfaces 10a as a locking-release starting point.

Description

  The present invention is, for example, a fastening structure used when fastening a cover cover and a cover cover constituting a decorative cover of a two-part structure that protects pipes and cables such as a drain hose and a refrigerant pipe. The present invention relates to a fastening structure for a superposed member that detachably engages and fixes both overlapping members such as connecting flanges provided in a face-to-face manner at a plurality of locations on the joining edge of the attachment cover and lid cover.

  As a fastening structure for the overlapping members, conventionally, the first engaging hole of the front surface side member and the second engaging hole of the back surface side member that are overlapped are stretched outward from the minimum inner diameter of the both engaging holes. A fastening member having a plurality of locking claws that can be elastically deformed from a locked state to be inserted into both locked holes to be inserted into both locked holes is configured to be insertable and attachable to the back surface side member. When the fastening member is inserted at a predetermined fastening position from the surface side with respect to both the locking holes, the claw portions of the respective locking claws that expand in the locked state are engaged and fastened from the radially inner side. A locked portion that prevents the member from moving out to the surface side, and an unlocking means for reducing the diameter of each locking pawl of the fastening member that is locked at the predetermined fastening position to the unlocked state are provided. (See Patent Document 1).

  The locked portion is configured with a rear surface side opening peripheral edge portion of a second locking hole of the back surface side member, and a claw portion of each locking claw of the fastening member passes through the second locking hole of the back surface side member. At that time, the diameter is expanded by an elastic restoring force, and the second engaging hole is configured to engage with the peripheral edge of the opening on the back side.

  In addition, to constitute the locking release means, the front end of each locking claw of the fastening member locked on the back surface side opening peripheral edge portion of the second locking hole on the back surface of the back surface side member at a predetermined fastening position With the position where the outer surface can be contacted as a starting point for unlocking, the claw portion of each locking claw is reduced to the unlocked state having the same diameter as the inner diameter of the second locking hole as the fastening member is turned. A guide portion provided with a lock release guide surface that is deformed in diameter is provided.

Utility Model Registration No. 2509888

  In the conventional fastening structure of superposed members, both the members can be locked and fixed simply by pressing and inserting the fastening members from the surface side into the overlapping locking holes of both the members. The work efficiency can be improved as compared with the case where the fastening is fixed by using the locking release means, and the locking claw of the fastening member locked at the predetermined fastening position is contracted to the locking released state by the locking release means. Since the diameter can be released by fastening, both the members can be freely separated at any time.

  However, at the time of releasing the fastening of both the members, when the fastening member locked to the peripheral edge of the back side opening of the second locking hole is extracted at a predetermined fastening position, conventionally, the claw portion of each locking claw is The fastening member is rotated in a state in which it is in contact with the back surface of the side member and the front outer surface of each locking claw of the fastening member is in contact with the locking release guide surface of the guide portion. It is necessary to reduce the diameter of the claw portion to an unlocked state having the same diameter as the inner diameter of the second locking hole against the elastic restoring force.

  At this time, since the operation resistance due to the claw portion of each locking claw being in sliding contact with the back surface of the back side member and the operation resistance for reducing the diameter of the claw portion of each locking claw are applied simultaneously, the fastening member A large amount of labor was required for the rotation operation.

  The present invention has been made in view of the above-described actual situation, and the main problem is that the fastening member is extracted when the fastening of both the members is released using the separation operation of the front side member and the back side member. It is in providing a fastening structure for a superposed member that can be easily and efficiently performed with less labor.

The first characteristic configuration according to the present invention is such that the first locking hole of the front surface side member and the second locking hole of the back surface side member to be superimposed are radially outward from the minimum inner diameter of both locking holes. A fastening member having a plurality of locking claws that can be elastically deformed from a locked state that protrudes into a locked state into a locked state that can be inserted into both locking holes is configured to be insertable, and the back side member When the fastening members are inserted into the predetermined fastening positions from the surface side with respect to both the locking holes, the claw portions of the respective locking claws that expand to the locked state are engaged from the radially inner side. A locked portion that prevents the fastening member from moving out to the surface side, and an unlocking means that reduces the diameter of each locking pawl of the fastening member that is locked at the predetermined fastening position to the unlocked state. Is a fastening structure of a polymerization member provided with,
To constitute the locking release means, the locked portion is composed of a plurality of locked surfaces intermittently formed in the circumferential direction in an arrangement corresponding to the claw portion of each locking claw of the fastening member. In addition, the back side member has the position where the claw portion of each locking claw engaged with the locked surface is rotated between adjacent locked surfaces as a locking release starting point. A plurality of locking release guide surfaces for reducing the diameter of each locking claw from the locked state to the locked released state in accordance with the pulling movement of the fastening member accompanying the relative separation operation between the front surface side member and the back surface side member. It is in a formed point.

  According to the above configuration, when the fastening member locked to the locked surface of the locked portion provided on the back surface side member is extracted at a predetermined fastening position in order to release the fastening of the two overlapped members. First, the fastening member is rotated until the claw portions of the respective locking claws locked on the locked surface are positioned at the locking release starting position between the adjacent surfaces of the locked surface. At this time, the operation resistance due to the claw portion of each locking claw being in sliding contact with the locked surface is added to the rotation operation, but the operation resistance for reducing the diameter of the claw portion of each locking claw is not added. .

  When the front side member and the back side member are separated from each other with the claw portions of the respective locking claws being rotated to the unlocking starting position, the fastening member is pulled out by the separation operation. Accordingly, the claw portion of each locking claw is slidably moved along the locking release guide surface and is reduced in diameter to the locked release state against the elastic restoring force, and is held by the surface side member. Is extracted as it is from the second locking hole of the back side member.

  Therefore, the operation timing of the rotation operation of the fastening member and the diameter reduction operation of each locking claw are different, and the diameter reduction operation of the fastening member can be performed using the relative separation operation of both members. The operation of extracting the fastening member when releasing the fastening of both members can be easily and efficiently performed with little effort.

  According to a second characteristic configuration of the present invention, the locked surface and the locking release guide surface are formed on an inner peripheral surface of the second locking hole of the back surface side member, and each engagement of the fastening member. When the pawl is inserted at a predetermined fastening position from the front surface side with respect to both the locking holes, the end of each locking pawl is configured to have a length that does not protrude from the back surface of the back surface side member. .

  According to the above configuration, in the fastening state where each locking claw of the fastening member is locked to the locked surface of the locked portion provided on the back side member at the predetermined fastening position, Since the tip does not protrude outside from the back surface of the back surface side member, deformation and damage of the fastening member due to collision with other objects can be avoided, and the back surface side member abuts against a mounting surface such as a wall surface. Since it can also be fixed in advance, the applicable range of the fastening structure of the present invention can be expanded.

  According to a third characteristic configuration of the present invention, a first recess in which the head of the fastening member can enter the inner peripheral surface of the first locking hole of the surface side member, and the fastening member pushed into the back side. A first reduced-diameter guide surface is formed that, when operated, reduces the diameter of each locking claw to the same diameter as the minimum inner diameter of the first locking hole as the fastening member is pushed in. It is in.

  According to the above configuration, the head of the fastening member in the fastening state where each locking claw of the fastening member is locked to the locked surface of the locked portion provided on the back side member at the predetermined fastening position. The amount of protrusion of the head of the fastening member is reduced by the amount that enters the first recess of the surface side member, and deformation and breakage of the fastening member due to collision with other objects can be avoided.

  Further, when the fastening member is inserted from the front surface side with respect to the first locking hole of the back surface side member, each of the first reduced diameter guide surfaces formed on the inner peripheral surface of the first locking hole of the surface side member The claw portions of the locking claws come into contact with each other, and the claw portions of the respective locking claws are smoothly reduced in diameter to the same diameter as the minimum inner diameter of the first locking hole as the fastening member is pushed in that state. Therefore, the fastening member can be easily inserted and mounted.

  According to a fourth characteristic configuration of the present invention, the claw portion of each locking claw of the fastening member is engaged from the radially inner side with respect to the rear surface side opening peripheral edge portion of the first locking hole of the front surface side member. The fastening member is configured to prevent the movement of the fastening member to the front surface side, and on the front surface side of the inner peripheral surface of the second locking hole of the back surface side member, the back surface of the front surface side member and the back surface side member A second recess is formed in which the claw portion of each locking claw engaged with the peripheral edge of the opening on the back surface side of the first locking hole of the surface side member can enter in the state where the surface of the surface side member is in contact. In the point.

  According to the above configuration, the claw portion of each locking claw of the fastening member expands in diameter immediately after passing through the first locking hole of the front surface side member, and on the back side opening peripheral edge portion of the first locking hole. In the engaged state, the fastening member can be prevented from moving out to the surface side, so that the fastening member can be temporarily held by the surface side member, and loss of the fastening member can be avoided.

  Moreover, when the fastening member is temporarily held on the front side member, the claw portions of the respective locking claws protrude outward from the back side of the front side member, but the back side of the front side member and the front side of the back side member In the state where the two contact holes are in contact, the claw portions of the respective locking claws enter the second concave portion formed on the front surface side of the inner peripheral surface of the second locking hole of the back surface side member. Packing in a combined state can be performed stably and compactly.

  In addition, when the fastening member temporarily held by the front side member is pushed into the back side, the back side of the front side member and the front side of the back side member can be brought into contact with each other, so that the fastening member can be pushed in stably. Can be operated.

  According to a fifth characteristic configuration of the present invention, in the inner peripheral surface of the second locking hole of the back surface side member, the fastening member is on the back surface side in a state where the claw portions of the locking claws enter the second recess. When the push-in operation is performed, a second reduced-diameter guide surface is formed for reducing the diameter of each locking claw to the same diameter as the minimum inner diameter of the second locking hole as the fastening member is pushed in. In the point.

  According to the above configuration, when the fastening member in which the claw portions of the respective locking claws enter the second recesses is pushed into the back surface side, it is formed on the inner peripheral surface of the second locking hole of the back surface side member. The claw portions of the respective locking claws abut on the second reduced diameter guide surface, and the respective locking claws have the same diameter as the minimum inner diameter of the second locking hole as the fastening member is pushed in that state. Thus, the fastening member can be easily inserted and mounted.

  According to a sixth characteristic configuration of the present invention, the claw portion of each locking claw is provided on the inner peripheral surface of the first locking hole of the front surface side member, and the back surface side opening peripheral edge portion of the first locking hole of the surface side member. The first engaging groove for positioning that engages in a state in which the rotating operation of the fastening member is allowed is formed in the rib formed on at least one of the locking claws in the state where the engaging member is engaged. It is in.

  According to the above configuration, in the temporary holding state in which the claw portions of the respective locking claws of the fastening member are engaged with the rear surface side opening peripheral edge portion of the first locking hole of the front surface side member, By engaging one formed rib with a first engagement groove formed on the inner peripheral surface of the first locking hole, unintentional rotation of the temporarily held fastening member is suppressed, and the surface The fastening member temporarily held in the first engagement hole of the side member can be maintained in a connection posture suitable for insertion into the second engagement hole of the back surface side member.

  In addition, since the rib for reinforcing the locking claw is also used as the locking projection for the first engaging groove for positioning, the structure for preventing the fastening member from rotating can be simplified.

  According to a seventh characteristic configuration of the present invention, on the inner peripheral surface of the second locking hole of the back surface side member, the claw portion of each locking claw is engaged with the locked surface of the back surface member. A second engaging groove for positioning is formed in the rib formed on at least one of the locking claws to engage with the fastening member in a state that allows the turning operation of the fastening member.

  According to the above configuration, at least one of the locking claws in the fastening state where each locking claw of the fastening member is locked to the locked surface of the locked portion provided on the back side member at the predetermined fastening position. Rotating the fastening member in the fastened state toward the unlocking starting position side by engaging the single formed rib with the second engaging groove formed on the inner peripheral surface of the second locking hole It is possible to suppress unintended fastening release resulting from the fastening member turning to the unlocking starting position.

  In addition, since the rib for reinforcing the locking claw is also used as the locking projection for the second engaging groove for positioning, simplification of the rotation preventing structure of the fastening member can be achieved.

The exploded top view of the corner cover which shows 1st Embodiment of this invention Front view of partly cut corner cover Sectional view (b) taken along line III (b) -III (b) in FIG. 1 showing the shape of the first locking hole formed in the front side connecting flange (front side member) of the other half-corner cover body And its top view (a) and bottom view (c) Sectional view (b) taken along line IV (b) -IV (b) in FIG. 1 showing the shape of the first locking hole, its plan view (a), and bottom view (c). Sectional drawing (b) in the V (b) -V (b) line of FIG. 1 which shows the shape of the 2nd latching hole formed in the back surface side connection flange (back surface side member) of one half-corner cover body. And its top view (a) and bottom view (c) A sectional view taken along line VI (b) -VI (b) of FIG. 1 showing the shape of the second locking hole, and a plan view (a) and a bottom view (c) thereof. Plan view (a), front view (b), bottom view (c), side view (d) showing the shape of the fastening member Sectional drawing of the principal part when a fastening member is temporarily hold | maintained to the surface side connection flange Sectional drawing of the principal part when superposing the front side connection flange and the back side connection flange Sectional drawing of the principal part when the fastening member temporarily hold | maintained by the surface side connection flange is pushed in to the 2nd locking hole of a back surface side connection flange. A plan view (a), a cross-sectional view (b), and a bottom view (c) of the main part when the front surface side connecting flange and the back surface side connecting flange are fastened by a fastening member. A plan view (a), a cross-sectional view (b), and a bottom view (c) of the main part when the fastening member that has been fastened is rotated 90 degrees in the direction of the arrow. Sectional view (b) taken along line XIII (b) -XIII (b) in FIG. 12, its plan view (a), and bottom view (c). Sectional drawing of the principal part when the other half-corner cover body is pulled apart to the separation side with respect to one half-corner cover body in the state where each latching claw is located at the unlocking starting position Sectional drawing of the principal part when the surface side connection flange and back surface side connection flange which show 2nd Embodiment of this invention are fastened with a fastening member

[First Embodiment]
The fastening structure of the superposed member according to the present invention is a makeup that protects piping and cables such as a refrigerant pipe, a drain hose, and an electric wire disposed along a piping path between an indoor unit and an outdoor unit of an air conditioner, for example. As shown in FIG. 1 and FIG. 2, an embodiment in which the cover A is applied to a synthetic resin corner cover in which the connecting ends of two straight cylindrical covers made of synthetic resin are connected in an orthogonal state. To do.

  As shown in FIGS. 1 and 2, the corner cover A is formed in a semi-hexagonal cylinder shape that can be externally fitted to a connecting end portion of a straight cylindrical cover having a regular hexagonal cylinder cross-sectional shape. 1 is formed of a pair of synthetic resin halved corner cover bodies A1 and A2 bent in an L shape, and one of the halved corner cover bodies A1 is used as a mounting cover (base cover) fixed to a wall surface or the like. The other half-corner cover body A2 is used as a lid cover.

  Both the half-corner cover bodies A1 and A2 face the joint edge 1a of the inner side wall 1 and the joint edge 2a of the outer side wall 2 of each of the half-corner covers A1 and A2. The fitting ridges 3 and the fitting grooves 4 that are fitted in a state where they can be attached to and detached from each other when they are joined to each other in a cylindrical shape in the fitting posture are distributed and formed with respect to the center position in the bending direction.

  Among the joint edge portions 1a and 2a of the one half-cornered cover body A1, the central portion in the bending direction that is continuous with the joint edge portion on the outer surface of the inner side wall portion 1 and the outer surface of the outer side wall portion 2 Connection flanges (hereinafter referred to as back-side connection flanges) 5 that are the back-side members of the fastening structure are integrally formed at two locations at substantially curved end positions that are continuous with the joining edge 2a.

  Of the joint end edges 1a, 2a of the other half-cornered cover body A2, one location in the center in the bending direction that is continuous with the joint end edge 1a on the outer surface of the inner side wall 1 and the outer surface of the outer side wall 2 Connection flanges (hereinafter referred to as “surface-side connection flanges”) 6 serving as surface-side members of the fastening structure are integrally formed at two locations at substantially curved end positions that are continuous with the joining edge portion 2a.

  The one half-corner cover body A1 and the other half-corner cover body A2 have the same external shape except for the fastening structure of the two connecting flanges 5 and 6, and face the both half-corner cover bodies A1 and A2. When joined in a mating position, the connecting flanges 5 and 6 having the same contour shape facing each other in the joining direction are superposed in contact with each other. The connecting flange 5 of one half-corner cover body A1 used as a cover) is referred to as a back surface side connecting flange (back surface side member), and the connecting flange 6 of the other half-corner cover body A2 used as a lid cover is the front surface side. It is called a connecting flange (surface side member).

  Next, the back-side connection flange 5 of one half-corner cover body A1 used as a mounting cover and the front-side connection flange 6 of the other half-corner cover body A2 used as a cover cover can be attached and detached in an overlapping state. The fastening structure fastened to will be described with reference to FIGS.

  A synthetic resin fastening member that can be inserted and mounted from the front side to the first locking hole 7 formed through the front side connection flange 6 and the second locking hole 8 formed through the back side connection flange 5. As shown in FIG. 7, 9 is an unlocked state that can be inserted into the locking holes 7, 8 from a locking state that projects radially outward from the minimum inner diameter of the locking holes 7, 8. A pair of locking claws 9A that can be elastically deformed, and a disk-shaped head portion 9B having a concave portion 9e for rotation operation formed on the surface side are integrally formed.

  The front end of each of the locking claws 9 </ b> A is provided on the inner peripheral surface of the rear surface side opening peripheral edge 6 a of the first locking hole 7 of the front surface side connection flange 6 and the second locking hole 8 of the rear surface side connection flange 5. A claw portion 9a having a locking surface 9b that selectively engages the formed locked portion 10 from the radially inner side to prevent the fastening member 8 from moving out to the surface side is provided in the radial direction. It is integrally formed so as to protrude outward.

  The tip outer surface of the claw portion 9a of both the locking claws 9A has a tapered inclined contact whose diameter decreases toward the distal end side in order to smoothly reduce the diameter of the both locking claws 9A against its elastic restoring force. It is comprised in the surface 9c, and in the center position of the width direction of the side surface of the both sides of the said locking claw 9A in the radial direction and the locking surface 9b of the claw portion 9a, the head 9B side is radially outward. A triangular reinforcing rib 9d is formed integrally to reduce the protruding amount to the side.

  Between the back surfaces of both locking claws 9A of the fastening member 9, the maximum outer surface distance L of both the claw portions 9a is elastic to a state where it is equal to or smaller than the minimum inner diameter of the both locking holes 7 and 8. A slit-shaped space S that allows deformation of the diameter against the restoring force is formed, and a maximum outer surface distance L when the two claws 9a are unloaded (natural state) is outside the head 9B. It is configured the same as the diameter.

  As shown in FIGS. 3 and 4, the head 9 </ b> B of the fastening member 9 can enter the inner peripheral surface of the first locking hole 7 of the surface side connection flange 6, specifically, the head 9 </ b> B. The first concave portion 12 set to the same depth as the thickness of the head portion 9B and an inner diameter slightly larger than the outer diameter of the head portion 9B, and both the claws 9a of the fastening member 9 are positioned in the first concave portion 12 When the member 9 is pushed to the back side, the claw portion 9a of each locking claw 9A becomes the same diameter as the minimum inner diameter of the first locking hole 7 as the fastening member 9 is pushed. A pair of first reduced-diameter guide surfaces 13 that are reduced in diameter to a state are formed.

  The first reduced diameter guide surface 13 has a reduced diameter guide start point as a maximum diameter position of a boundary step portion between the first recess 12 and the back surface side minimum inner diameter hole portion 7a in the first locking hole 7, and the back surface side. Using the intermediate position in the hole axis direction of the minimum inner diameter hole portion 7a as the diameter reduction guide end point, it is formed in an inclined posture with a smaller diameter toward the back surface side at two opposite positions of the front surface side portion of the rear surface side minimum inner diameter hole portion 7a. ing.

  Furthermore, the claw portions 9a of the respective locking claws 9A are provided on the inner peripheral surface of the back surface side minimum inner diameter hole portion 7a in the first locking hole 7 of the front surface side connection flange 6. A pair engaged with the reinforcing rib 9d formed on each of the locking claws 9A from the radially inner side or the hole axial direction in the state where the hole 7 is engaged with the peripheral edge 6a on the back side (see FIG. 9). The first engaging groove 14 for positioning is formed, and the engaging force between the first engaging groove 14 and the reinforcing rib 9d is small enough to allow the rotating operation of the fastening member 9. The resultant force, that is, the engagement force at which the reinforcing rib 9d gets over the first engagement groove 14 and is disengaged at the initial stage of the set rotation operation force applied to the fastening member 9 is set.

  As shown in FIGS. 5 and 6, the back surface of the front surface side connection flange 6 and the surface of the back surface side connection flange 5 are located on the front surface side of the inner surface of the second locking hole 8 of the back surface side connection flange 5. In the abutting state, a pair of second recesses 15 into which the claw portions 9a of the respective locking claws 9A engaged with the rear surface side opening peripheral edge portion 6a of the first locking hole 7 of the front surface side connecting flange 6 can enter. Is formed.

  The inner diameter between the opposing surfaces of both the second recesses 15 is configured to be the same as the inner diameter between the opposing surfaces of both the first recesses 12 of the surface side coupling flange 6, and the depth of the second recesses 15 is The depth of the dimension is slightly larger than the contour shape of the claw portion 9a of both the locking claws 9A.

  As shown in FIG. 5 and FIG. 6, the claw portions 9 a of the respective locking claws 9 </ b> A enter the second recess 15 on the inner peripheral surface of the second locking hole 8 of the back side connection flange 5. When the fastening member 9 is pushed to the back surface side, a pair of diameter-reducing deformations of the respective locking claws 9A to the same diameter as the minimum inner diameter of the second locking hole 8 as the fastening member 9 is pushed. The second reduced diameter guide surface 16 is formed.

  The second reduced diameter guide surface 16 has a maximum diameter position on the back side of the second recess 15 as a reduced diameter guide start point, and the intermediate position in the axial direction of the surface side minimum inner diameter hole portion 8a in the second locking hole 8. Is formed in an inclined posture with a smaller diameter toward the back side at two opposite locations on the surface side portion of the surface side minimum inner diameter hole portion 8a.

  As shown in FIGS. 5 and 6, the fastening member 9 is fastened to both the locking holes 7 and 8 from the front side on the inner peripheral surface of the second locking hole 8 of the back surface side connecting flange 5. When inserted to the position, the locking surface 9b of each claw portion 9a that expands into a locked state by elastic restoring force immediately after passing through the surface-side minimum inner diameter hole portion 8a engages from the radially inner side. The engaged portion 10 that prevents the fastening member 9 from moving out to the surface side, and the engagement claw 9a of the fastening member 9 that is in the locked state at the predetermined fastening position are reduced in diameter to the unlocked state. Stop release means B is provided.

To constitute the locking release means B, the locked portion 10 is an annular formed at the boundary between the front-side minimum inner-diameter hole portion 8a and the rear-side large-diameter hole portion 8b in the second locking hole 8. Of the step surface,
The back surface side connecting flange 5 is composed of two arcuate locked surfaces 10a intermittently formed in the circumferential direction in an arrangement corresponding to the claw portions 9a of the locking claws 9A of the fastening member 9. The position at which the claw portion 9a of each locking claw 9A that has been engaged with the locked surface 10a is rotated between adjacent to the locked surface 10a is the locking release starting point (the locking release start point). And the rear side connecting flange 5 and the rear side connecting flange 5 with the maximum diameter position on the back side of the second recess 15 which is also the starting point for reducing the diameter of the second reduced diameter guide surface 16 being the unlocking end point. As the fastening member 9 is pulled out due to the relative separation operation, the diameter of each locking claw 9A is reduced from the locked state to the unlocked state, in other words, each locking claw 9A is second locked. A pair of locking release guide surfaces 17 are formed to reduce the diameter to the same diameter as the minimum inner diameter of the hole 8.

  The locking release guide surface 17 is provided at two opposing positions in the portion from the back-side maximum diameter position of the second recess 15 to the back-side edge in the front-side minimum inner diameter hole portion 8a of the second locking hole 8. It is formed in an inclined posture with a smaller diameter on the surface side.

  In the state where the claw portions 9a of the respective locking claws 9A are engaged with both the locked surfaces 10a of the back surface side connecting flange 5 on the inner peripheral surface of the second locking hole 8 of the back surface side connecting flange 5, A pair of positioning second engagement grooves 18 that are engaged with the reinforcing ribs 9d formed on the respective locking claws 9A from the radially inner side or the hole axis direction are formed. The engaging force between the groove 18 and the reinforcing rib 9d is a small engaging force that allows the turning operation of the fastening member 9, that is, the reinforcing rib at the initial stage of the set turning operation force applied to the fastening member 9. 9d is set to an engagement force that gets over the second engagement groove 18 and is disengaged.

  Next, the back-side connection flange 5 of one half-corner cover body A1 used as a mounting cover and the front-side connection flange 6 of the other half-corner cover body A2 used as a cover cover are fastened in an overlapping state. The process and the process of releasing the fastening will be briefly described.

[1] When packing the two half-corner cover bodies A1 and A2 in the face-to-face orientation, as shown in FIG. 8, the first engagement of the front side connecting flange 6 of the other half-corner cover body A2 Of the holes 7, the inclined contact surfaces 9 c formed on the claw portions 9 a of the respective locking claws 9 </ b> A of the fastening member 9 are applied to the pair of first reduced diameter guide surfaces 13, and the mounting orientation posture of the fastening member 9 is determined. The fastening member 9 is pushed into the rear surface side in a state where the fixed mounting orientation is determined.

  In this state, the reinforcing ribs 9d of the respective locking claws 9A are formed in the pair of first engaging grooves 14 formed on the inner peripheral surface of the first locking hole 7 of the surface side connection flange 6 in the axial direction of the hole axis. The fastening member 9 is temporarily held on the front-side connecting flange 6 in a predetermined mounting posture.

As shown in FIGS. 2 and 9, when the two half-corner cover bodies A <b> 1 and A <b> 2 are joined to face each other, the inclined contact surface 9 c of the fastening member 9 becomes the second engagement of the back side connection flange 5. Each of the first diameter-reduced guide surfaces 16 formed on the inner peripheral surface of the stop hole 8 is brought into contact with the second reduced-diameter guide surface 16 and pushed up, and engages with the back-side opening peripheral edge 6a of the first locking hole 7 of the front-side connection flange 6. The claw portion 9 a of the locking claw 9 </ b> A enters the second recessed portion 15 of the back side connection flange 5.
In this state, since the back surface of the front surface side connection flange 6 and the surface of the back surface side connection flange 5 are in contact, both the half-corner cover bodies A1, A2 can be packed in a stable posture.

[2] The pipe / cable arrangement work for one half-corner cover body A1 fixed to a wall or the like is completed, and the back-side connection flange 5 of the one half-corner cover body A1 and the other half-half cover body A1 When fastening the front surface side connection flange 6 of the split corner cover body A2, as shown in FIGS. 9 to 11, the back surface of the front surface side connection flange 6 and the front surface of the back surface side connection flange 5 are in contact with each other. Therefore, the fastening member 9 can be pushed in stably and easily.

  At this time, since the inclined contact surface 9c of the fastening member 9 is in contact with the second reduced diameter guide surface 16 in the second locking hole 8 of the back-side connection flange 5, the fastening member 9 is pushed in. Thus, the claw portions 9a of the respective locking claws 9A are smoothly reduced in diameter with a small operating force to the same diameter as the minimum inner diameter of the second locking hole 8, and the surface side minimum inner diameter hole portion of the second locking hole 8 When passing through 8a, the claw portions 9a of the respective locking claws 9A are expanded in diameter by the elastic restoring force, and the locking surfaces 9b of the respective claw portions 9a are in contact with the respective locked surfaces 10a of the locked portions 10. Thus, engagement from the radially inward side is prevented, and the movement of the fastening member 8 to the surface side is prevented.

In this state, the reinforcing ribs 9d of the respective locking claws 9A are radially inward in the pair of second engaging grooves 18 formed in the inner peripheral surface of the second locking hole 8 of the back side coupling flange 5. Or it engages from a hole axial direction, and the fastening member 9 is temporarily hold | maintained in the predetermined fastening attitude | position.
Therefore, since the claw portion 9a of the fastening member 9 in the fastening posture can be prevented from rotating unexpectedly toward the unlocking starting position of the locking release guide surface 17, the claw portion 9a of the fastening member 9 can be suppressed. Unintentional release of the coupling flanges 5 and 6 due to the rotation to the unlocking starting position can be avoided.

[3] When releasing the fastening between the rear surface side connecting flange 5 of one half-corner cover body A1 and the front surface side connecting flange 6 of the other half-corner cover body A2, as shown in FIGS. Then, the fastening member 9 is rotated 90 degrees so that the claw portions 9a of the respective locking claws 9A are positioned at the locking release starting position of the locking release guide surface 17.
In this state, when the other half-corner cover body A2 used as a lid cover is pulled apart to the separation side with respect to one half-corner cover body A1 fixed to the wall or the like, the front-side connection flange 6 and the back-side connection As the fastening member 9 is withdrawn and moved away from the flange 5, the claw portions 9a of the respective locking claws 9A are reduced in diameter from the locked state to the unlocked state. The claw portion 9 a of the locking claw 9 </ b> A is reduced in diameter to the same diameter as the minimum inner diameter of the second locking hole 8, and the fastening member 9 held by the front surface side connection flange 6 is the second engagement of the back surface side connection flange 5. It is extracted from the stop hole 8 as it is.

  Therefore, the operation timing of the rotation operation of the fastening member 9 and the diameter reduction operation of each locking claw 9A are different, and the diameter reduction operation of the fastening member 9 is performed in one half of the half fixed to a wall or the like. Since it can be performed by using the operation of pulling away the other half-split corner cover body A2 with respect to the corner cover body A1, the operation of pulling out the fastening member 9 at the time of releasing the connection of both the connecting flanges 5 and 6 can be performed with less labor. Can be performed efficiently and easily.

[Second Embodiment]
In the first embodiment described above, the claw portions 9 a of the respective locking claws 9 </ b> A of the fastening member 9 are connected to the locked portions 10 formed on the inner peripheral surface of the second locking holes 8 of the back surface side connecting flange 5. However, as shown in FIG. 15, the engaged portion 10 is connected to the back side opening peripheral edge of the second locking hole 8 of the back side connecting flange 5. You may comprise with a part.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) In the above-described embodiment, the fastening structure of the overlapping member according to the present invention is applied to a corner cover having a two-part structure, which is an example of the decorative cover A having a divided structure made of synthetic resin that protects piping and cables. The form has been explained, but a joint cover with a two-part structure connecting two straight cylindrical covers in a straight line, a T-type joint cover with a two-part structure connecting three straight cylindrical covers in a T-shape, a straight line You may apply to the fastening structure of the decorative cover A of other division structures, such as the terminal cover of the two division structure attached to the terminal of a cylindrical cover.
Furthermore, the technology of the present invention may be applied to the fastening structure of the two members that are overlapped in a field other than the decorative cover A as described above.

(2) In the above-described embodiment, the fastening member 9 formed with the two engaging claws 9A that are paired in the radial direction is used, but the number of the engaging claws 9A of the fastening member 9 is three or four. There may be more than one.
Further, the number of the locked surfaces 10a, the number of the first reduced diameter guide surfaces 13, the number of the second recesses 15 formed, and the second reduced diameter corresponding to the number of the locking claws 9A of the fastening member 9. The number of guide surfaces 16 formed and the number of lock release guide surfaces 17 formed may be changed.
Further, the number of the locked surfaces 10 a, the number of first reduced diameter guide surfaces 13, the number of second recessed portions 15, the number of second reduced diameter guide surfaces 16, and the formation of the locking release guide surface 17. You may form more than the number of the latching claws 9A of the fastening member 9.

(3) In the above-described embodiment, the locking release guide surface 17 is rotated between the adjacent claw portions 9a of the locking claws 9A engaged with the locked surface 10a. The moved position is defined as the unlocking start point, and the position of the maximum diameter on the back side of the second recess 15 is defined as the unlocking end point. Of these, the unlocking end point is the periphery of the opening on the surface side of the second locking hole 8. It may be set to a part.
Further, in the case of the second embodiment, the locking release starting point of the locking release guide surface 17 is the back side opening peripheral edge of the second locking hole 8 of the back side connection flange 5.
In short, as the unlocking guide surface 17, the position where the claw portion 9 a of each locking claw 9 A that has been engaged with the locked surface 10 a is rotated between adjacent to the locked surface 10 a is locked. As the release starting point, the diameter of each of the locking claws 9A is reduced from the locked state to the unlocked state as the fastening member 9 is pulled out with the relative separation operation of the front surface side member 6 and the back surface side member 5. Any structure may be used as long as the structure can be made.

(4) In the above-described embodiment, the head portion 9B of the fastening member 9 is formed in a circular shape, but the head portion 9B may be configured in a hexagonal shape that can be rotated with a rotary operation tool.
Further, the shape of the claw portion 9a in the locking claw 9A of the fastening member 9 can be changed as appropriate according to the usage conditions.

(5) In the above-described embodiment, each locking claw 9A is provided on the inner peripheral surface of the first locking hole 7 of the front surface side connecting flange 6 and the inner peripheral surface of the second locking hole 8 of the rear surface side connecting flange 5. A pair of positioning engaging grooves 14 and 18 that are engaged with the reinforcing rib 9d formed in the radial direction inward or from the axial direction of the hole axis are formed. When the total number of 9 is one, at least one engagement groove 14, 18 may be formed on the inner peripheral surface of the first locking hole 7 and the inner peripheral surface of the second locking hole 8.
In short, the number of engaging grooves 14 and 18 formed on the inner peripheral surface of the first locking hole 7 and the inner peripheral surface of the second locking hole 8 is the number of reinforcing ribs formed on the locking claw 9A. It may be set appropriately according to the total number of nine.

B Lock release means 5 Back side member (back side connecting flange)
6 Surface side member (surface side connecting flange)
6a Back side opening peripheral edge portion 7 First locking hole 8 Second locking hole 9 Fastening member 9A Locking claw 9B Head portion 9a Claw portion 9d Reinforcing rib 10 Locked portion 10a Locked surface 12 First recess 13 First reduced-diameter guide surface 14 First engagement groove 15 Second recess 16 Second reduced-diameter guide surface 17 Unlocking guide surface 18 Second engagement groove

Claims (7)

Both locks from the locked state projecting outward in the radial direction from the minimum inner diameter of the both locking holes with respect to the first locking hole of the front surface side member and the second locking hole of the back surface side member to be overlaid A fastening member having a plurality of latching claws that can be elastically deformed in an unlocked state that can be inserted into the hole is configured to be insertable and attachable to the back side member. When inserted into a predetermined fastening position from the surface side with respect to the hole, the claw portion of each locking claw that expands into a locked state engages from the radially inner side and moves out of the fastening member to the surface side. A superposed member fastening structure provided with a latched portion that prevents the locking and a latch releasing means for reducing the diameter of each locking claw of the fastening member that is locked at the predetermined fastening position to the unlocked state Because
To constitute the locking release means, the locked portion is composed of a plurality of locked surfaces intermittently formed in the circumferential direction in an arrangement corresponding to the claw portion of each locking claw of the fastening member. In addition, the back side member has the position where the claw portion of each locking claw engaged with the locked surface is rotated between adjacent locked surfaces as a locking release starting point. A plurality of locking release guide surfaces for reducing the diameter of each locking claw from the locked state to the locked released state in accordance with the pulling movement of the fastening member accompanying the relative separation operation between the front surface side member and the back surface side member. Fastening structure of superposed member formed.   The locked surface and the unlocking guide surface are formed on the inner peripheral surface of the second locking hole of the back side member, and the locking claws of the fastening member are formed in the locking holes. On the other hand, the overlapping structure of the superposition | polymerization member of Claim 1 comprised so that the front-end | tip of each said latching claw may not protrude from the back surface of a back surface side member, when it inserts in the predetermined fastening position from the surface side.   A first recess into which the head of the fastening member can enter the inner peripheral surface of the first locking hole of the front side member, and when the fastening member is pushed into the back side, the fastening member is pushed in The fastening of the superposition | polymerization member of Claim 1 or 2 with which the 1st diameter reduction guide surface which carries out the diameter reduction deformation of each said latching claw to the same diameter as the minimum internal diameter of a 1st locking hole is formed with a movement. Construction.   The claw portions of the respective locking claws of the fastening member are engaged from the radially inner side with respect to the peripheral edge of the back surface side opening of the first locking hole of the front surface side member, and are pulled out to the front surface side of the fastening member. In the state where the movement is prevented and the surface side of the inner peripheral surface of the second locking hole of the back side member is in contact with the back side of the front side member and the surface of the back side member The 2nd recessed part in which the nail | claw part of each latching claw engaged with the back surface side opening peripheral part of the 1st latching hole of the said surface side member can enter is formed. The fastening structure of the superposition | polymerization member of description.   When the fastening member is pushed to the back side in a state where the claw portions of the respective locking claws enter the second recesses on the inner peripheral surface of the second locking hole of the back side member, the fastening member The fastening structure for a superposed member according to claim 4, wherein a second reduced diameter guide surface is formed for reducing the diameter of each of the locking claws to the same diameter as the minimum inner diameter of the second locking hole with the push-in movement. .   On the inner peripheral surface of the first locking hole of the surface side member, the claw portion of each locking claw is engaged with the rear surface side opening peripheral edge of the first locking hole of the surface side member. The positioning first engaging groove that engages with a rib formed on at least one of the claws in a state of allowing the rotation operation of the fastening member is formed in any one of claims 1 to 5. The fastening structure of the superposition | polymerization member of description.   The inner peripheral surface of the second locking hole of the back surface side member is formed on at least one of the locking claws in a state where the claw portion of each locking claw is engaged with the locked surface of the back surface side member. The overlapping structure of the superposition | polymerization member of any one of Claims 1-6 in which the 2nd engaging groove for positioning which engages in the state which accept | permits the rotation operation of the said fastening member is formed in the formed rib. .

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