JP2013059139A - Assembly including lock mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembly including a lock mechanism which saves a space of the lock mechanism, obtains stable holding force while inhibiting the damage of the lock mechanism, and has a new structure.SOLUTION: A pair of engagement protruding pieces 34a, 34b, which engage with an engagement protruding part 26 provided on an outer surface 24 of a case body 12, is provided so as to protrude from a protruding end edge part 36 of a peripheral wall 32 of a cover member 14 and be spaced away from each other in the circumferential direction of the peripheral wall 32 without protruding to the outer side in the thickness direction of the peripheral wall 32. Further, a cutout part 46, which opens at the protruding end edge part 36 of the peripheral wall 32, is formed between the pair of engagement protruding pieces 34a, 34b in the peripheral wall 32.

Description

  The present invention relates to an assembly component including a case main body and a cover member that covers an opening of the case main body, and more particularly to an assembly component including a lock mechanism that fixes the case main body and the cover member to each other.

  Conventionally, an assembly part having a lock mechanism in which a case body and a cover member are fixed to each other by a lock mechanism, such as a harness protector for inserting and protecting an automobile wire harness and a relay box to which a relay is connected Is used in various fields. For example, as described in JP-A-5-252634 (Patent Document 1), the harness protector has a case main body and a cover member, and the case main body is opened with the wire harness accommodated therein. The cover member is covered on the portion and fixed to each other by the lock mechanism, so that the wire harness is accommodated and protected between the case main body and the cover member.

  By the way, as described in Patent Document 1, such a lock mechanism has a frame-shaped insertion engagement frame that forms an insertion hole between the case body and the outer wall of the case body. Is formed to protrude. Therefore, there is a problem that the case body is increased in size.

  In view of this, JP 2000-134759 A (Patent Document 2) discloses an engagement protrusion provided with an insertion hole in the side wall of the case body and protruding from a cover plate that covers the opening of the case body in the cover member. An assembly component for inserting and fixing the screw into the insertion hole is disclosed. In this way, protrusion of the lock mechanism to the outside of the case body can be suppressed, and space saving can be achieved.

  However, in the assembly component described in Patent Document 2, the engagement protrusion of the cover member protrudes directly from the cover plate that covers the opening of the case body. Therefore, stress concentrates on the connecting part with the cover plate that is the protruding base end portion of the engagement protrusion, and the engagement protrusion is likely to be deformed or damaged, and a stable fixing force may not be obtained. there were.

JP-A-5-252634 JP 2000-134759 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is to save space of the lock mechanism and to obtain a stable fixing force by suppressing damage to the lock mechanism. An object of the present invention is to provide an assembly part having a lock mechanism having a novel structure.

  The first aspect of the present invention includes a case main body having an opening and a cover member that covers the opening of the case main body, and the case of the engagement protrusion provided on the cover member. In an assembly part including a lock mechanism in which the case main body and the cover member are fixed to each other by engagement with a locking projection provided on the main body, the side wall of the case main body protrudes outward and protrudes from the engagement surface. While the stop projection is provided, the cover member has a cover plate that covers the opening and a peripheral wall that protrudes from an end edge portion of the cover plate. A pair of engaging protrusions extending in the protruding direction of the peripheral wall without projecting outward in the thickness direction of the peripheral wall are provided apart from each other in the circumferential direction of the peripheral wall, and the pair of engagement members Opposite direction of the pair of engaging protrusions at the protruding tip of the mating protrusion A locking claw that protrudes inward is formed, and a cutout that opens to the protruding end edge is formed on the peripheral wall of the cover member between the pair of engaging protrusions. The peripheral wall of the cover member is superimposed on the outer surface of the side wall of the case body, and the locking protrusion is received between the pair of engaging protrusions so that the locking claw is engaged with the engagement claw. It is characterized by being locked to the stop protrusion.

  According to the assembly part including the lock mechanism having the structure according to the present invention, the notch portion that opens to the protruding end edge portion of the peripheral wall is formed between the pair of engaging protrusions on the peripheral wall of the cover member. . As a result, when the pair of engaging protrusions engage with the locking protrusions of the case body, the pair of engaging protrusions is compared with the case where the pair of engaging protrusions are connected by the peripheral wall. It can be made easy to bend in the direction opposite to each other. Further, the stress applied to the base end portion of the engaging protrusion at the time of bending deformation is distributed to the peripheral portion of the cutout portion extending over a predetermined range in the circumferential direction and the protruding direction of the peripheral wall, thereby improving the durability of the engaging protrusion. Can be improved.

  That is, by providing the notch, the durability of the lock mechanism can be improved without increasing the thickness of the pair of engaging protrusions extending from the protruding end edge of the peripheral wall. Accordingly, the engagement protrusion is formed without projecting outward in the thickness direction of the peripheral wall, so that the lock mechanism and thus the entire assembly part can be reduced in size, and the lock stability and durability of the lock mechanism can be improved. Improvements can be made.

  The present invention is, for example, a harness protector that inserts and protects an automobile wire harness, or an electrical connection box such as a junction box or a relay box that is mounted on an automobile and connected to electrical components such as a fuse, a relay, or a connector. The present invention is not limited to other automobiles and can be widely applied to various assembly parts used in each field.

  According to a second aspect of the present invention, in the one described in the first aspect, the cover member is formed with a support rib that sandwiches the side wall of the case main body between the pair of engaging protrusions. It is what.

  According to this aspect, the side wall of the case body is supported from the inside by the support rib of the cover member. By this, even when a load is applied to the inside of the case body due to other members coming into contact with the locking projection of the case body, the side walls are supported by the support ribs from the inside of the case body. The locking projection can be reduced to the inside of the case body with respect to the engaging claw and the engagement state between the locking claw and the locking projection can be released. The engaged state with the locking projection can be stably maintained.

  A third aspect of the present invention is the one described in the first or second aspect, wherein the notch is formed over the lid plate.

  According to this aspect, the peripheral part of the notch part between a pair of engagement protrusions can be formed larger. Thereby, the stress at the time of bending deformation of an engagement protrusion can be disperse | distributed to a wider range. Moreover, the rigidity of the engaging protrusion can be improved by using the connecting corner between the cover plate and the peripheral wall as the base end, and the durability can be further improved.

  In the present invention, the pair of engaging protrusions that engage with the locking protrusions provided on the outer surface of the case body are projected from the protruding end edge of the peripheral wall of the cover member outward in the thickness direction of the peripheral wall. Without being spaced apart from each other in the circumferential direction of the peripheral wall, a notch that opens to the protruding end edge of the peripheral wall is formed between the pair of engaging protrusions on the peripheral wall of the cover member. Thereby, the stress at the time of a bending deformation of a pair of engagement protrusion at the time of engaging with the latching protrusion of a case main body can be disperse | distributed to the peripheral part of a notch part. Accordingly, the risk of damage to the lock mechanism can be reduced without making the engagement protrusion thick, and the engagement protrusion can be secured without protruding outward in the thickness direction of the peripheral wall while ensuring durability. Can be formed. As a result, the space of the lock mechanism can be reduced, and the stability and durability of the lock mechanism can be improved while reducing the size of the entire assembly part.

The exploded perspective view of the assembly parts as one embodiment of the present invention. The side view of the principal part of the case main body shown in FIG. The side view of the principal part of the cover member shown in FIG. The top view of the principal part shown in FIG. VV sectional drawing in FIG. The side view of the assembly | attachment state of a lock mechanism. VII-VII sectional drawing in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 1 shows a harness protector 10 as an assembly part including a lock mechanism as one embodiment of the present invention. The harness protector 10 is configured such that a cover member 14 is fixed to a case main body 12 with lock mechanisms 16 provided at a plurality of locations. A wire harness (not shown) is housed in the case body 12 in an inserted state, and the cover member 14 is assembled to the case body 12 to house and protect the wire harness in the case body 12 and the cover member 14. It is like that. The lock mechanisms 16 are provided at a plurality of locations in the longitudinal direction of the harness protector 10 in pairs on both sides in the width direction perpendicular to the longitudinal direction of the harness protector 10.

  The case body 12 is made of a synthetic resin. The case body 12 has a substantially U-shaped cross section in which a pair of side walls 20, 20 are vertically erected along the bottom wall 18 from both edges in the width direction of the bottom wall 18 having a long rectangular plate shape. Has been issued. Thus, the case body 12 has both ends in the longitudinal direction open, and has an opening 22 opened in the protruding direction from the bottom wall 18 of the side walls 20, 20.

  As shown in FIG. 2, a locking projection 26 projects from the outer surface 24 of the side wall 20. The locking protrusion 26 protrudes from the outer surface 24 to the outside of the case body 12 with a substantially constant cross-sectional shape. The cross-sectional shape of the locking protrusion 26 is not particularly limited, and a rectangular shape such as a square or a rectangle, a circular shape, other polygonal shapes, or an arbitrary shape can be employed. The locking projection 26 in the present embodiment protrudes from the outer surface 24 with a substantially equilateral triangular cross section that tapers upward (in FIG. 2, upward). As a result, the locking projection 26 is formed with a locking surface 28 extending in the longitudinal direction (left and right direction in FIG. 2) of the case body 12 over a predetermined width dimension Wl by a lower surface corresponding to the bottom of the equilateral triangle. In addition, guide surfaces 29 and 29 extending obliquely from the upper side to the lower side (in FIG. 2, from the upper side to the lower side) are formed by both side surfaces corresponding to the hypotenuse of the equilateral triangle. As shown in FIG. 7 to be described later, the protrusion dimension H1 of the locking protrusion 26 from the outer surface 24 is the thickness dimension of the engagement protrusions 34a and 34b to be described later: Tc (see FIG. 5 to be described later). It is almost equal.

  On the other hand, as shown in FIG. 1, the cover member 14 is made of synthetic resin. The cover member 14 has a substantially U-shaped cross section in which a pair of peripheral walls 32 and 32 are vertically erected along the lid plate 30 from both edges in the width direction of the lid plate 30 having a long rectangular plate shape. The length of the case main body 12 is substantially equal.

  In the cover member 14, a pair of engaging protrusions 34 a and 34 b shown in FIGS. 3 to 5 are formed at positions corresponding to the locking protrusions 26 of the case body 12. The engaging protrusions 34a and 34b are linearly projected from the protruding edge 36 of the peripheral wall 32 from the cover plate 30 in the same direction as the protrusion of the peripheral wall 32 from the cover plate 30 (downward in FIG. 3). ing. The engaging protrusions 34a and 34b are integrally formed with the peripheral wall 32 by partially extending the peripheral wall 32 downward (downward in FIG. 3), and have a thickness dimension equal to the thickness dimension of the peripheral wall 32. : Tc is projected from the peripheral wall 32 without projecting outward in the thickness direction of the peripheral wall 32 (rightward in FIG. 5).

  The engaging protrusions 34a and 34b are opposed to each other in the circumferential direction of the peripheral wall 32 (in the left-right direction in FIG. 3). And the latching claws 40a and 40b are formed in the protrusion front-end | tip parts 38a and 38b from the surrounding wall 32 in the engagement protrusions 34a and 34b, respectively. The locking claws 40a and 40b are formed so as to protrude from the projecting tip portions 38a and 38b to the inner side in the opposing direction (left and right direction in FIG. 3) of the engaging projecting pieces 34a and 34b. In the locking claws 40a, 40b, the rear end edge portion (upper edge portion in FIG. 3) of the engaging protrusions 34a, 34b protrudes in the protruding direction of the engaging protrusions 34a, 34b. The locking surfaces 42, 42 extend substantially perpendicular to the vertical direction. Further, the opposing surfaces 44, 44 of the locking claws 40a, 40b facing the other are gradually separated from each other as they go forward (downward in FIG. 3) in the protruding direction of the engaging protrusions 34a, 34b. It is supposed to be an inclined surface that becomes larger.

  These engaging claws 40a and 40b are opposed to each other in the circumferential direction of the peripheral wall 32 (in the left-right direction in FIG. 3), so that the engaging protrusions 34a and 34b are at the upper edge of the engaging claws 40a and 40b. 3 (the upper edge portion in FIG. 3) is the closest, and the separation distance D1 at the upper edge portions of the locking claws 40a, 40b is the locking surface 28 of the locking projection 26 in the case body 12. The width dimension is smaller than Wl (see FIG. 2). On the other hand, the separation distance D2 of the engaging protrusions 34a and 34b in the non-forming portions of the locking claws 40a and 40b is set larger than the width dimension Wl of the locking surface 28.

  A notch 46 is formed between the engagement protrusions 34 a and 34 b on the peripheral wall 32. The notch 46 is formed so that the peripheral wall 32 is open to the protruding end edge 36 between the engaging protrusions 34a and 34b. Furthermore, the notch 46 in the present embodiment is formed over the cover plate 30 of the cover member 14 and has a rectangular shape that opens to the edge of the cover plate 30 in plan view as shown in FIG. Have. Thereby, the notch part 46 is formed with the peripheral part including the three inner surfaces 48a, 48b, 48c. Further, curved portions 50 and 50 are formed at the connecting portion between the inner surface 48a and the inner surface 48b, which are the corners of the notch 46, and the connecting portion between the inner surface 48b and the inner surface 48c, respectively, and the corners are dropped. The possibility that stress is locally concentrated on the corner of the portion 46 is reduced.

  In the cover plate 30 of the cover member 14, a support rib 52 is integrally formed on the inner side (left side in FIG. 5) of the engagement protrusions 34 a and 34 b. The support rib 52 has a substantially flat plate shape that is continuous on the same plane from the inner surface 48b of the notch 46 and protrudes from the lid plate 30 in the same direction as the engagement protrusions 34a and 34b. The support rib 52 is positioned inward of the cover member 14 with a predetermined gap dimension: Ds with respect to the engagement protrusions 34 a, 34 b, and the gap dimension: Ds is the side wall 20 of the case body 12. The thickness dimension is slightly larger than Tb (see FIG. 7 described later). The protrusion dimension of the support rib 52 from the cover plate 30 (the vertical dimension in FIG. 5) is such that the support rib 52 overlaps behind the locking protrusion 26 when the cover member 14 is assembled to the case body 12. Thus, the size is set so as to reach at least the locking surfaces 42, 42 of the engaging protrusions 34a, 34b. Further, the width dimension of the support rib 52 (the dimension in the left-right direction in FIG. 3) is substantially equal to the facing distance D2 of the engagement protrusions 34a and 34b so that the support rib 52 overlaps the entire locking protrusion 26. The size is set.

  Such a cover member 14 is overlaid on the opening 22 of the case body 12, so that the opening 22 of the case body 12 is covered with the cover plate 30 of the cover member 14. Further, the peripheral walls 32, 32 of the cover member 14 are superimposed on the outer surfaces 24, 24 of the side walls 20, 20 of the case body 12. 6 and 7 show the lock mechanism 16 in the assembled state of the cover member 14 to the case body 12. When the cover member 14 is overlaid on the case body 12, the engagement protrusions 34 a and 34 b of the cover member 14 are overlaid on the outer surface 24 of the side wall 20 of the case body 12 and approach the locking protrusion 26. Then, when the engaging protrusions 34a and 34b come into contact with the locking protrusion 26 from the protruding tips 38a and 38b, the engaging protrusions 34a and 34b are elastically separated from each other (the engaging protrusion 34a). Is bent in the left direction in FIG. 6 and the engaging protrusion 34b is bent in the right direction in FIG. Since the guide surfaces 29 and 29 of the locking protrusion 26 and the opposing surfaces 44 and 44 of the locking claws 40a and 40b of the engaging protrusions 34a and 34b are inclined surfaces, the guide surfaces 29 and 29 By the guide action by the contact with the opposing surfaces 44, 44, the bending deformation in the direction of expanding the engaging protrusions 34a, 34b can be easily performed.

  When the locking claws 40a and 40b get over the locking protrusion 26, the engaging protrusions 34a and 34b approach each other with a restoring force and return to the original shape. As a result, the locking protrusion 26 is accommodated between the engaging protrusion 34a and the engaging protrusion 34b, and the locking claws 40a and 40b are located below the locking protrusion 26 (downward in FIG. 6). The locking surfaces 42, 42 of the locking claws 40a, 40b and the locking surface 28 of the locking projection 26 are positioned so that the cover member 14 is superposed on the case body 12 (vertical direction in FIG. 6). At the opposite position. As a result, when the cover member 14 is about to be detached from the case body 12 (when moved upward in FIG. 6), the locking claws 40a and 40b are locked by the locking protrusions 26. Thus, the cover member 14 is fixed to the case main body 12. Thus, in the present embodiment, the lock mechanism 16 is configured including the engagement protrusions 34 a and 34 b and the locking protrusion 26.

  Furthermore, as shown in FIG. 7, in the present embodiment, the lock mechanism 16 includes the support rib 52. In the assembled state of the cover member 14 to the case body 12, the side wall 20 of the case body 12 is sandwiched between the engaging protrusions 34 a and 34 b and the support rib 52. Thereby, the support rib 52 is arrange | positioned so that the whole back side (left side in FIG. 7) of the latching protrusion 26 may overlap.

  In the harness protector 10 having the structure according to the present embodiment, the notch 46 is formed between the engagement protrusion 34 a and the engagement protrusion 34 b on the peripheral wall 32 of the cover member 14. As a result, the notch 46 is not formed, and the engagement protrusion 26 a and the engagement protrusion 34 b are connected by the peripheral wall 32 when engaged with the locking protrusion 26. The engaging protrusions 34a and 34b can be easily bent and deformed.

  Furthermore, by forming the notch 46, the engaging protrusion 34a and the engaging protrusion 34b are connected via the inner surfaces 48a, 48b, 48c of the notch 46. As a result, the stress applied to the protruding proximal end portion of the engaging protrusions 34a and 34b from the peripheral wall 32 during the bending deformation spreads in the circumferential direction (left-right direction in FIG. 6) and the protruding direction (downward in FIG. 6). The inner surfaces 48a, 48b, and 48c can be dispersed, and the durability of the engaging protrusions 34a and 34b can be improved. As a result, the durability of the engagement protrusions 34a and 34b can be improved without increasing the thickness dimension Tc of the engagement protrusions 34a and 34b. As a result, the engagement protrusions 34a and 34b can be formed without protruding outward from the peripheral wall 32, and space saving of the lock mechanism 16 can be achieved. Moreover, since the protrusion amount of the lock mechanism 16 to the outside of the case main body 12 is suppressed, a larger effective space for the harness protector 10 formed in the case main body 12 and the cover member 14 can be secured.

  In particular, in the present embodiment, the notch 46 is formed across the cover plate 30 of the cover member 14. Thereby, the peripheral part of the notch part 46 comprised including inner surface 48a, 48b, 48c can be enlarged, and the more excellent stress dispersion | distribution effect is obtained in the case of bending deformation of the engagement protrusions 34a, 34b. I can do it. Further, the connecting corner portion 54 (see FIG. 7) between the cover plate 30 and the peripheral wall 32 can be used as the base end portion of the engaging protrusions 34a and 34b to further improve the rigidity of the engaging protrusions 34a and 34b. I can do it.

  Further, the side wall 20 of the case body 12 is sandwiched between the engaging protrusions 34 a and 34 b and the support rib 52, and the support rib 52 is disposed on the back side of the locking protrusion 26. As a result, the side wall 20 is supported even when a load is applied to the locking projection 26 from the outside of the case body 12 to the inside (from right to left in FIG. 7) due to contact with other members. By contacting the ribs 52 and supporting the locking protrusions 26 with the support ribs 52, the engagement state with the engagement protrusions 34a and 34b can be more stably maintained. Further, when engaging the engaging protrusions 34 a and 34 b with the locking protrusion 26, the side walls 20 of the engaging protrusions 34 a and 34 b are sandwiched between the engaging protrusions 34 a and 34 b and the support rib 52. It is possible to suppress the lifting from the side, and it is possible to perform the engagement work more stably.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the notch portion does not necessarily need to be formed to reach the cover plate of the cover member, and may be formed only on the peripheral wall between the pair of engaging protrusions.

  The present invention is not limited to a harness protector, and can be widely applied to assembly parts in various fields in which a case main body and a cover member are fixed to each other via a lock mechanism. For example, in an electrical junction box such as a junction box or a relay box mounted on an automobile, the present invention is applied by using a box body to which a connector or a relay is connected as a case body, and an upper case or a lower case covering the box body as a cover member. It is also possible to do.

10: Harness protector (assembled part having a lock mechanism), 12: case main body, 14: cover member, 16: lock mechanism, 20: side wall, 22: opening, 24: outer surface, 26: locking projection, 30 : Cover plate, 32: peripheral wall, 34a, b: engaging protrusion, 36: protruding edge, 38a, b: protruding tip (engaging protrusion), 40a, b: locking claw, 46: notch 48a, b, c: inner surface, 52: support rib

Claims (3)

The case main body having an opening and a cover member that covers the opening of the case main body, and a locking protrusion provided on the case main body of an engagement protrusion provided on the cover member In an assembly part including a lock mechanism in which the case body and the cover member are fixed to each other by engagement with
While the side wall of the case body is provided with the locking projection protruding to the outer surface,
The cover member has a cover plate that covers the opening and a peripheral wall that protrudes from an end edge portion of the cover plate, and protrudes outward in the thickness direction of the peripheral wall at the protruded end edge portion of the peripheral wall. A pair of engaging protrusions extending in the protruding direction of the peripheral wall without being provided apart from each other in the peripheral direction of the peripheral wall, and While a locking claw that protrudes inward in the opposite direction of the engaging projection piece is formed,
On the peripheral wall of the cover member, a notch that opens to the protruding end edge is formed between the pair of engaging protrusions,
The peripheral wall of the cover member is overlapped with the outer surface of the side wall of the case body, and the locking protrusion is received between the pair of engaging protrusions so that the locking claw is the locking protrusion. An assembly part comprising a lock mechanism that is locked to The assembly part provided with the lock mechanism according to claim 1, wherein the cover member is formed with a support rib that sandwiches the side wall of the case body between the pair of engagement protrusions.   The assembly part provided with the lock mechanism according to claim 1, wherein the notch is formed over the cover plate.

Images