JP4902221B2 - Case lid structure - Google Patents

Description

  The present invention relates to a housing lid stopper structure in which a lid is mounted and fixed in a liquid-tight manner at an opening of a housing that houses a photoelectric sensor and the like, and further, scratches are prevented when the lid is mounted.

  In recent years, photoelectric switches and photoelectric sensors have been used in a wide range of fields, and water resistance, oil resistance, and the like have been required depending on the environment in which they are used. Specifically, the use of a photoelectric switch in an oil mist atmosphere caused by scattering of cutting oil in an automatic machining line can be mentioned.

  As a specification corresponding to such a working environment, as shown in FIG. 12A, a locking claw 61b protruding in a sawtooth shape is formed on both side portions 61a of a metal case (housing) 61 and an opening portion is conventionally formed. Locking holes 62b are formed in both side portions 62a of a metal cover (lid body) 62 attached to 61c, and the cover 62 is opened from the opening 61c side of the case 61 as shown in FIGS. A structure is used in which the locking claw 61b of the case 61 is fitted and locked in the locking hole 62b of the cover 62 as shown in FIG.

There is also known a lid stopper structure by caulking processing in which a cover is attached to the opening of the metal case and the periphery of the opening is bent inward to fix the cover (see, for example, Non-Patent Document 1). ).
OMRON TECHNICS Vol. 34 (Vol. 112) 1994

  In the structure shown in FIG. 12, the surface of the locking claw 61b is changed from when the tips (edges) of both side portions 62a of the cover 62 hit the locking claw 61b as shown in FIGS. Since it progresses while cutting, when the locking claw 61b is fitted and locked in the locking hole 62b of the cover 62 as shown in FIG. Abrasion occurs and looks bad.

  In addition, when something is caught on the tip of the side portion 62a of the cover 62 and opened outward, the locking claw 61b is easily detached from the locking hole 62b, and the cover 62 may be detached from the case 61.

  In addition, when the case and the locking claw are formed of a resin member or the like, the locking claw is scraped off by the tip of the cover when the metal cover is mounted, and the cover can be locked to the case. There is also a risk that it will not be possible.

  On the other hand, the caulking process in which a metal cover is attached to the opening of the metal case and the peripheral edge of the opening is bent and fixed requires high machining accuracy in the caulking part of the opening of the case and the structure becomes complicated. Moreover, since the peripheral part of the opening part of a case is bend | folded, the part of a crimping process becomes long, a production technique is required and production equipment becomes expensive. Furthermore, the coating film may be peeled off during the caulking process. In such a case, there is a concern that the environment resistance may be deteriorated by exposing the ground of the metal case.

  As a structure for mounting and fixing the cover to the case, as shown in FIG. 13A, square locking recesses 63b are formed on both side portions 63a of the case 63, and the front ends of both side portions 64a of the cover 64 are substantially inward. The hook 64b is bent at a right angle, and the cover 64 is inserted into the opening 63c of the case 63 as shown in FIG. A structure for fitting and locking the locking claw 64b, or, as shown in FIG. 14 (a), a rectangular locking recess 65b is formed in both side portions 65a of the case 65, and a corresponding portion of the both side portions 66a of the cover 66 is formed. A locking claw 66b is formed so as to protrude on the inside, and the cover 66 is inserted into the opening 65c of the case 65 as shown in FIG. 5B, and the locking claw 66b is engaged with the locking recess 65b as shown in FIG. A structure for fitting and locking the pawl 66b is also conceivable.

  According to such a structure, as shown in FIGS. 13B and 14B, the surfaces of the side portions 63a and 65a of the cases 63 and 65 are scraped by the locking claws 64b and 66b, and scratches are generated. Even in this case, as shown in FIGS. 13 (c) and 14 (c), the scratches are not visible after the covers 64 and 66 are attached.

  However, when the case is formed by, for example, zinc die casting or the like, even though no scratches are visible, there is a concern about degradation of environmental resistance due to exposure of zinc. Furthermore, since the cover is formed by sheet-metal processing of a thin steel plate, it cannot be said that the cover is sufficient in terms of bending accuracy and the strength of the locking claws.

  In addition, when the case and the locking claw are formed of a resin member or the like, the locking claw is scraped off by the tip of the cover when the metal cover is mounted, and the cover can be locked to the case. There is a risk that it will not be possible.

  It is an object of the present invention to fix a lid body without being liquid-tight and detached from an opening of a housing that houses a photoelectric sensor or the like in a liquid-tight manner, and to prevent scratching when the lid body is mounted. An object of the present invention is to provide a case lid fixing structure.

In order to solve the above-described problem, a housing lid stopper structure according to claim 1 of the present invention is provided as follows.
A housing that houses an object to be waterproofed, a seal member that is attached to the opening of the housing, a pressing plate that liquid-tightly closes the opening through the sealing member, and the pressing member that is pressed against the sealing member A housing lid stopper structure comprising a central portion that presses the plate and a lid body that is bent substantially at right angles to one side and is attached and locked to the outer surface of the housing,
Forming two engaging portions between the housing and the lid;
The first engaging portion is engaged with the locking portion formed on the outer surface of the housing and the locking portion formed on the side portion of the lid body when the lid body is attached to the opening. And a locking portion for locking the lid to the housing.
The second engagement portion is formed on either the outer surface of the housing or the side portion of the lid, and a convex portion that separates the tip of the side from the outer surface of the housing when the lid is attached, The outer surface of the housing and the side portion of the lid body are formed on the other side, and the concave portion that engages with the convex portion when the lid body is attached to the opening,
When the lid is aligned with the opening of the housing and pushed in the mounting direction, both sides of the lid are expanded outward from the base by the convex portions of the second engaging portion, and the tip of the side is By separating from the outer surface of the housing and the locking portion, the tip of the side portion does not interfere with the housing during the operation of pushing the lid into the housing opening , and
The first engaging portion and the second engaging portion are arranged such that one of the engaging portions is recessed by a predetermined distance from the other in the mounting direction of the lid with respect to the housing opening. It is characterized by.

  When the lid is aligned with the opening of the housing and pushed in the mounting direction, both sides of the lid are expanded outward from the root by the convex portion of the second engaging portion, and the tip of the side is the outer surface of the housing and the engagement. Separate from the stop. When the lid is further pushed in, the central portion presses the pressing plate to compress the seal member, the convex portion engages with the concave portion, and the engaging portions of the first engaging portion engage with each other to open the housing. The lid body is attached and locked to. The pressing plate is attached to the opening by the lid through the seal member, so that the opening becomes liquid-tight. When the lid is mounted on the casing, the tip moves away from the outer surface of the casing by the convex portion, thereby preventing the outer surface from being scratched by the edge or burr of the tip of the side portion. Moreover, it becomes difficult to remove the lid from the housing.

Further, by forming the first engaging portion and the second engaging portion so as to be displaced from each other, the lid body is engaged and protruded in a state where the lid body is attached to the opening of the housing. The portion and the engaging recess receive stress in a direction that strengthens the engagement between the locking portions, and the lid body is difficult to be detached from the housing.

Moreover, the housing lid stopping structure according to claim 2 of the present invention is
A housing that houses an object to be waterproofed, a seal member that is attached to the opening of the housing, a pressing plate that liquid-tightly closes the opening through the sealing member, and the pressing member that is pressed against the sealing member A housing lid stopper structure comprising a central portion that presses the plate and a lid body that is bent substantially at right angles to one side and is attached and locked to the outer surface of the housing,
Forming two engaging portions between the outer surface of the opening of the housing and the side of the lid;
The first engaging portion is engaged with the locking claw formed on the outer surface of the housing and the locking claw formed on the side of the lid when the lid is attached to the opening. And a locking hole
The second engaging portion is formed to bulge inwardly on the side portion of the lid, and when mounted on the opening portion, the second engaging portion rides on the outer surface of the housing and widens the side portion to the outside so that the tip is extended to the housing. An engaging convex portion that is separated from the outer surface of the body and the locking claw, and an engaging concave portion that is formed on the outer surface of the housing and engages with the engaging convex portion when the lid is attached to the opening. Become
When the lid is aligned with the opening of the housing and pushed in the mounting direction, the engaging convex portion bulging inward of the side of the lid hits the outer end surface of the opening, and when pushed further, the Engaging protrusions run on the outer surface of the housing, and accordingly, the both side portions open outward from the base and the tip of the side portion is separated from the outer surface of the housing and the locking claw. During the operation of pushing the lid into the opening, so that the tip of the side does not interfere with the housing; and
The first engaging portion and the second engaging portion are arranged such that one of the engaging portions is recessed by a predetermined distance from the other in the mounting direction of the lid with respect to the housing opening. It is characterized by.

  When the lid is aligned with the opening of the housing and pushed in the mounting direction, the engaging projection that bulges inwardly on the side of the lid hits the outer end face of the opening, and when pushed further, the engaging projection Riding on the outer surface, along with this, both sides open outward from the root and the tip of the side is separated from the outer surface and the locking claw. When the lid is further pushed in, the central portion presses the pressing plate to compress the seal member, the engaging convex portion engages with the engaging concave portion of the casing, and the locking claw of the casing fits into the locking hole. . In this way, the lid is attached to the opening of the housing. The holding plate is attached to the opening in a liquid-tight manner by being attached to the opening through the seal member by the lid.

In addition, when the lid is attached to the casing, the tip is moved away from the outer surface of the casing and the locking claw by the engaging protrusion on the side. It is possible to prevent the outer surface from being scratched. Moreover, it becomes difficult to remove the lid from the housing.

Further, by forming the first engaging portion and the second engaging portion so as to be displaced from each other, the lid body is engaged and protruded in a state where the lid body is attached to the opening of the housing. The portion and the engagement recess receive stress in a direction that strengthens the engagement between the locking claw and the locking hole, and the lid body is difficult to be detached from the housing.

Further, according to claim 3 of the present invention, in the case lid structure according to claim 2 , the engagement convex portion strengthens the engagement between the locking claw and the locking hole of the first engagement portion. A stress is applied to the side portion of the lid body in the direction to engage with the engaging recess.

  In a state where the lid is attached to the opening of the housing, the engaging convex portion of the lid is engaged with the engaging recess of the housing, and the locking claw of the housing is engaged with the locking hole of the lid The lid body is less likely to come off by receiving stress in a direction that strengthens the engagement between the locking claw and the locking hole by the engaging convex portion and the engaging concave portion.

According to claim 4 of the present invention, in the case lid structure according to claim 2 or 3 , the engagement convex portion is formed with a curved surface along the mounting direction of the lid, and the fitting The joint recess is formed to be recessed in a substantially trapezoidal shape along the mounting direction, and the end of the engaging projection on the back side in the mounting direction is in contact with the end on the back side in the mounting direction.

  When the lid is mounted on the casing, the tip is moved away from the outer surface of the casing and the locking claw by the side engaging protrusion, and the engaging protrusion is curved along the moving direction. As a result, it is possible to smoothly slide and to prevent the outer surface of the housing from being scratched. Further, by making the engagement concave portion into a substantially trapezoidal shape, the engagement convex portion can be smoothly engaged, and the end portion of the engagement convex portion on the rear side in the mounting direction is attached to the end portion on the rear side in the mounting direction. A stress in a direction that strengthens the locking state between the locking claw and the locking hole by abutting engagement is effectively generated.

  According to the present invention, a lid can be attached and fixed without being liquid-tight and detached from an opening of a housing that houses liquid-tight parts such as photoelectric switches. Further, the structure is simple and the manufacture is easy, and the assembling work of the lid is improved.

  In addition, when the lid is attached to the opening of the housing, the outer surface of the housing is prevented from being scratched, and the paint film or plating applied to the outer surface is prevented from being peeled off, thereby improving the appearance. And environmental resistance is prevented from deteriorating. In particular, when the casing is formed by die-casting zinc and coatings such as coating and plating are applied to the outer surface, these coatings are prevented from being scratched or peeled off, and are extremely effective against environmental resistance degradation. It is.

  In addition, by housing the photoelectric sensor and the like in the housing with the above structure, it becomes possible to use it in a working environment such as a mist atmosphere in which cutting oil or cleaning fluid scatters. Can be used.

  Hereinafter, a housing lid stopper structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a lid-stopping structure for a casing that houses, for example, a photoelectric sensor as a target or part to be waterproofed. The casing lid-stopping structure 1 is a casing (housing) that houses a photoelectric sensor 2. 11, a lid unit 13 that is liquid-tightly attached to an opening 11f for housing the photoelectric sensor 2 in the housing 11, and a liquid in a window 11g that opens in a light projecting / receiving portion of the photoelectric sensor 2 formed in the housing 11. The lid unit 14 to be tightly attached, the lid unit 15 to be liquid-tightly attached to the holes 11h and 11h ′ (see FIG. 3) for pulling out the cable 3 of the photoelectric sensor 2 formed in the housing 11 and the like. It has.

  The photoelectric sensor 2 has a thin rectangular parallelepiped shape in which the front surface 2a is long in the width direction (left-right direction), the side surface is long in the front-rear (depth) direction, and the height (vertical direction in the drawing) is low.

  A light projecting / receiving unit (not shown) is provided at a substantially central position of the front surface 2a, and the cable 3 extends from the corner. The light projecting / receiving unit includes a light projecting unit and a light receiving unit arranged side by side. The light projecting from the light projecting unit and reflected by the detected object is detected by the light receiving unit to detect the presence / absence of the detected object. It is supposed to be.

  As shown in FIGS. 1 to 3, the housing 11 has a rectangular parallelepiped box substantially the same as the photoelectric sensor 2, and the photoelectric sensor 2 can be accommodated with a slight gap. A large rectangular opening 11f into which the photoelectric sensor 2 can be inserted is formed on the side surface 11b on one side of the housing 11, and a window (opening) 11g having the same size as that of the light projecting / receiving unit is formed at a substantially central position of the front surface 11a. A hole (opening) 11h for inserting the cable 3 and a hole 11h ′ having a diameter larger than the hole 11h are formed concentrically. Further, the housing 11 is formed with insertion holes 11i for inserting attachment bolts at the left and right positions of the edge on the rear surface 11d side.

  As shown in FIGS. 2 and 3, the opening portion 11f is lower than the side surface 11b by a predetermined dimension, so that the lid unit 13 can be mounted flush. And the groove | channel 11j for fitting a sealing member over the perimeter is formed in the peripheral part of the opening part 11f of the side surface 11b. The edge 11k on the opening 11f side of the upper and lower surfaces 11c as the outer surface is a recess slightly deeper than the plate thickness of the cover (cover) 33 of the cover unit 13, and the engagement recess 21 is formed at a substantially central position. The engaging claws 22 and 22 are formed on both sides of the engaging recess 21.

  As shown in FIG. 4, the engaging recess 21 has a substantially trapezoidal cross section along the mounting direction of the lid 33 (the depth direction from the opening 11f side). The edge (end surface) 22b is formed in a substantially saw-tooth shape perpendicular to the edge 11k (upper surface 11c). Then, the end portion 21 a on the back side in the mounting direction of the engaging recess 21 is located on the back side in the mounting direction by a slight distance d from the edge 22 b of the locking claw 22. This distance d is set accurately. In this way, the locking claw 22 and the engaging recess 21 are formed at positions shifted left and right and front and rear (depth direction). Note that the edge 22b of the locking claw 22 may be positioned on the rear side in the mounting direction by a distance d slightly smaller than the end portion 21a on the rear side in the mounting direction of the engaging recess 21.

  As shown in FIGS. 2 and 3, the window 11 g is lower than the front surface 11 a by a predetermined dimension, so that the lid unit 14 can be mounted flush. And the groove | channel 11m for fitting a sealing member over the perimeter is formed around the window 11g of the front surface 11a. The edge 11n on the window 11g side of the upper and lower surfaces 11c is a recess slightly deeper than the plate thickness of the cover (cover) 38 of the cover unit 14, and the engagement recess 24 is formed at a substantially central position. Locking claws 25 are formed on both sides of the engaging recess 24. The engaging recess 24 and the locking claw 25 are formed in the same shape and positional relationship as the engaging recess 21 and the locking claw 22 shown in FIG.

  The edge 11p on the corner 11e side of the upper and lower surfaces 11c is a recess slightly deeper than the plate thickness of the lid (cover) 43 of the lid unit 15 as shown in FIG. 27 is formed, and engaging recesses 28 are formed on both sides of the locking claw 27. The locking claw 27 and the engagement recess 28 are formed in the same shape and positional relationship as the engagement recess 21 and the locking claw 22. The housing 11 is integrally formed by, for example, zinc die casting. And surface treatment such as painting and plating is applied to prevent the zinc from melting in the usage environment where mist such as cutting oil and cleaning liquid is scattered, and the durability is improved. Yes.

  Returning to FIG. 1, the lid unit 13 includes a packing 31 as a sealing member, a pressing plate 32, and a lid 33. The packing 31 is formed in a frame shape that can be fitted into a groove 11j formed at the peripheral edge of the opening 11f. The holding plate 32 is formed of, for example, a transparent plastic member that is slightly larger than the packing 31.

  The lid 33 has a substantially U-shape in which both side portions 33b of the central portion 33a are bent at substantially right angles to one side, and can be attached to the opening 11f of the housing 11. As shown in FIG. 6, the engaging projections 33 e that can be engaged with the engaging recesses 21 formed on the upper and lower surfaces 11 c of the housing 11, and the engagement that can be locked with the locking claws 22. A stop hole 33f is formed.

  As shown in FIG. 7, the engaging convex portion 33 e is formed so as to bulge in an arc shape with the side portion 33 b inside and at least along the mounting direction (depth direction). 22 can be locked. As shown in FIG. 10, in the state where the edge 22b of the locking claw 22 is locked to the opening end surface 33g of the locking hole 33f, the end portion 33h on the mounting direction side of the engaging convex portion 33e is the engaging concave portion 21. It is possible to contact the end portion 21a on the back side in the mounting direction with elasticity. The lid 33 is formed by sheet metal processing of a thin steel plate, for example, a stainless steel plate having excellent corrosion resistance.

  Returning to FIG. 1, the lid unit 14 includes a rubber seal 35 fitted to the window 11 g, a packing 36 as a seal member fitted to the groove 11 m, a pressing plate 37, and a lid (cover) 38. The rubber seal 35 has a flat plate shape, and two holes (windows) 35a and holes (windows) 35b are formed side by side so as to correspond to the light projecting part and the light receiving part of the light projecting / receiving part. The partition wall 35c between the holes 35a and 35b prevents the light projected from the light projecting unit from being diffusely reflected on the inner surface of the holding plate 37 and entering the light receiving unit.

  The packing 36 is formed in a frame shape that can be fitted into a groove 11m formed around the window 11g. The pressing plate 37 is made of transparent plastic or glass, has a slightly larger shape than the packing 36, and can be in close contact with the rubber seal 35 and the packing 36. The holding plate 37 needs to transmit light projected from the light projecting unit of the light projecting / receiving unit, transmit reflected light from the detected object, and enter the light receiving unit, and uses a hard and scratch-resistant glass. It is preferable to do. Therefore, in this embodiment, glass is used as the pressing plate 37 (hereinafter referred to as “glass 37”).

  The lid body (cover) 38 has a substantially U-shape in which both side portions 38b of the central portion 38a are bent substantially at right angles to one side, and can be attached to the window 11g of the casing 11, and the central portion (front surface) 38a. A hole 38c having the same size as the window 11g is formed at a position corresponding to the glass 37. The both side portions 38b are formed with engaging convex portions 38e that can be engaged with the engaging concave portions 24 formed on the upper and lower surfaces 11c of the housing 11, and locking holes 38f that can be locked with the locking claws 25. ing.

  The engaging convex portion 38e is formed by bulging the side surface 38b inwardly and in an arc shape along the mounting direction, and the locking hole 38f can be locked with the locking claw 25. Then, as in the case of the lid 33, in the state in which the locking claw 25 is locked in the locking hole 38f, the rear end portion in the mounting direction of the engaging convex portion 38e is the end portion in the mounting direction in the mounting concave portion 24. And can be contacted with elasticity. The lid body 38 is also formed by subjecting a stainless steel plate to sheet metal processing in the same manner as the lid body 33.

  The lid unit 15 includes a rubber bush 41, a pressing ring 42, and a lid (cover) 43. The rubber bush 41 has a large-diameter portion 41a and a small-diameter portion 41b formed concentrically and integrally to form a convex shape when viewed from the side, and a hole 41c into which the cable 3 is inserted is formed at the center. The large-diameter portion 41a can be press-fitted into the hole 11h of the housing 11 at the tip (see FIG. 8). The rubber bush 41 has a function as a packing, and the pressing ring 42 has a function as a pressing plate.

  The holding ring 42 can be fitted over the large diameter portion 41a and the small diameter portion 41b of the rubber bush 41 and can be press-fitted into the hole 11h ′ of the housing 11 (see FIG. 8), and the outer peripheral surface is knurled. . The holding ring 42 is formed of a metal member such as brass having corrosion resistance.

  The lid body (cover) 43 has a substantially U-shape in which both side portions 43b of the central portion 43a are bent substantially at right angles to one side, and can be attached to the corner portion 11e of the housing 11, and the central portion (rear surface) ) A hole 43c through which the small diameter portion 41b of the rubber bush 41 through which the pressing ring 42 is inserted is formed in the center of 43a. Further, the engaging protrusions engageable with the engaging recesses 28 and the engaging recesses 43 f that can be engaged with the engaging claws 27 formed at the corners 11 e of the upper and lower surfaces 11 c of the housing 11 are formed on both side parts 43 b. 43e is formed.

  The lid body 43 has a substantially trapezoidal shape on both side portions 43b to be attached to the corner portion 11e of the housing 11, and a locking hole 43f is arranged in the central portion to ensure the strength. Engagement projections 43e are arranged on both sides of the lens. The engaging convex portions 43e and the locking holes 43f are formed in the same manner as the engaging convex portions 33e and the locking holes 33f formed in the lid 33. Similarly to the lid 33, the lid 43 is formed by subjecting a stainless steel plate to sheet metal processing.

  Next, the procedure for assembling the housing lid stopper structure 1 having the above configuration will be described with reference to FIG. First, the terminal of the cable 3 of the photoelectric sensor 2 is inserted from the opening 11f of the housing 11 and pulled out from the holes 11h and 11h ′ (see FIG. 3) of the corner 11e, while the photoelectric sensor 2 is removed from the opening 11f. 11, the rubber bush 41, the holding ring 42, and the lid 43 of the lid unit 15 are inserted from the terminal of the cable 3 pulled out to the base of the cable 3. In this state, the light projecting / receiving portion of the photoelectric sensor 2 coincides with the window 11 g of the housing 11.

  Next, as shown in FIG. 8, the tip end portion of the large diameter portion 41a of the rubber bush 41 is press-fitted into the hole 11h of the housing 11, and the pressing ring 42 is placed on the upper portion of the large diameter portion 41a and the small diameter portion 41b of the rubber bush 41. The presser ring 42 is press-fitted into the hole 11h ′. The pressing ring 42 is fixed by the knurling applied to the outer circumferential surface biting into the inner circumferential surface of the hole 11 h ′ so that it cannot be deviated.

  The rubber bush 41 is reduced in diameter by press-fitting the tip end portion of the large diameter portion 41a into the hole 11h, and further by fitting the holding ring 42 to the upper portion of the large diameter portion 41a and the small diameter portion 41b, so that the inner periphery of the hole 41c. The surface is in close contact with the cable 3 and is liquid-tightly attached. Next, the lid 43 is inserted from the terminal of the cable 3 and attached to the corner 11 e of the housing 11. The housing 43 is fixed by engaging the engaging projections 43e and the locking holes 43f formed on the side portions 43b with the engaging recesses 28 and the locking claws 27 of the housing 11. The mounting of the lid 43 to the housing 11 will be described in detail in the mounting of the lid 33 of the lid unit 13.

  Next, a case where the lid unit 13 is attached to the opening 11f of the housing 11 will be described. As shown in FIG. 1, the packing 31 is fitted into the groove 11j at the peripheral edge of the opening 11f, and the pressing plate 32 is attached.

  FIG. 9 shows an outline when the lid 33 is attached to the opening 11 f of the housing 11. When the lid 33 is aligned with the opening 11f and moved in the direction of the arrow as shown in FIG. 9A, a curved surface is formed inward of the side portion 33b of the lid 33 as shown in FIG. When the bulging engagement convex portion 33e hits the outer end surface of the opening portion 11f and is further pushed into the opening portion 11f, the engagement convex portion 33e is smoothly formed on the upper and lower surfaces 11c as shown in FIG. It rides on the edge portion 11k, and accordingly, both side portions 33b are opened outward, and the tip is separated from the edge portion 11k.

  When the lid 33 is further pushed in, the central portion 33a presses the holding plate 32 and compresses the packing 31 (see FIG. 1), and the engaging convex portion 33e becomes the engaging concave portion of the housing 11 as shown in FIG. The engaging claw 22 of the housing 11 is fitted into the engaging hole 33f. In this way, the lid 33 is attached to the opening 11f of the housing 11.

  Then, as shown in FIG. 8, the pressing plate 32 is attached to the opening 11 f in a liquid-tight manner by being attached to the opening 11 f (see FIG. 1) via the packing 31 by the lid 33.

  When the lid 33 is attached to the housing 11, the tip moves away from the edge 11 k of the housing 11 and the upper surface 22 a (FIG. 4) of the locking claw 22 by the engaging convex portion 33 e of the side portion 33 b. In addition, since the engaging convex portion 33e is curved along the moving direction (mounting direction), it is possible to prevent the edge portion 11k from being scratched by an edge or burr at the tip of the side portion 33b.

  Further, the lid body 33 is attached to the opening 11 f of the housing 11, the engagement convex portion 33 e of the lid body 33 is engaged with the engagement concave portion 21 of the housing 11, and the locking claw 22 of the housing 11 is lidded. As shown in FIG. 10, the edge 22b of the locking claw 22 is brought into contact with and locked to the opening end surface 33g of the locking hole 33f in the state where it is locked in the locking hole 33f of the body 33, and the engagement convex portion 33e. The end portion 33h abuts on the end portion 21a of the engaging recess 21 with an elastic force at a position separated by a distance d farther than the edge 22b. As a result, the lid 33 receives stress in the direction of the arrow due to the elastic force of the engaging convex portion 33e, and the opening end surface 33g of the locking hole 33f is pressed against the edge 22b of the locking claw 22 and is difficult to come off.

  Further, as shown in FIGS. 4 and 10, the edge 11k of the upper and lower surfaces 11c of the housing 11 is recessed by the plate thickness of the lid 33, so that the side portion 33b of the lid 33 is flush with the upper and lower surfaces 11c. , It becomes difficult to get caught at the tip of the side portion 33 b, and the lid 33 is more difficult to be detached from the housing 11.

  The above-described attachment of the lid unit 15 to the case corner 11e of the cover 43 is the same as the case where the cover 33 is attached to the opening 11f of the case 11. Moreover, the effect is also the same.

  Returning to FIG. 1, the case where the lid unit 14 is attached to the window 11g of the housing 11 will be described. First, the rubber seal 35 is attached to the window 11g, the packing 36 is fitted to the peripheral groove 11m, the glass 37 as a pressing plate is attached, and the lid 38 is attached. The lid 38 is attached to the housing 11 in the same manner as the lid 33 is attached to the housing 11 described above. Moreover, the effect is also the same.

  The lid 38 presses the glass 37 against the packing 36 by the central portion 38a, the engaging convex portion 38e formed on the side portion 38b is engaged with the engaging concave portion 24 of the housing 11, and the locking hole 38f is engaged. Locked to the pawl 25 and fixed. Similarly to the lid body 33, the lid body 38 is prevented from being scratched on the edge portion 11 n of the upper and lower surfaces 11 c by edges, burrs, and the like of the side portion 38 b and difficult to come off from the housing 11. In this manner, the photoelectric sensor 2 is housed in the casing 11 in a liquid-tight manner.

  In the above embodiment, the engaging protrusions 33e, 38e, 43e formed on the side portions 33b, 38b, 43b of the lids 33, 38, 43 are formed to bulge inward, but are bulged outward. It is also possible to form an engagement recess, and to form an engagement protrusion that engages with the engagement recess on the upper and lower surfaces 11c of the housing 11.

  FIG. 11 shows a modification of the present invention, in which the housing 11 is formed with locking claws 11s and locking grooves 11t on the edge 11k side of the upper and lower surfaces 11c. On the other hand, both sides 51b of the central part 51a are bent substantially at right angles to one side of the lid (cover) 51, and the locking claws 51c are bent inwardly and locked with the locking claws 11s. A locking claw 51d that is formed and that locks with the locking groove 11t is cut and raised inward. When the lid 51 is attached to the housing 11, the side 51b rides on the edge 11k of the upper and lower surfaces 11c of the housing 11 and opens to the outside by the locking claw 51d as in FIG. 9C described above. Abrasion due to the locking claw 51c is prevented. In this case, the edge 11k may be slightly scratched by the tip of the locking claw 51d, but there is no problem in appearance because it is covered by the side 51b.

It is an assembly perspective view of the case lid stop structure concerning one embodiment of the present invention. It is a top view of the housing | casing shown in FIG. It is sectional drawing of the housing | casing shown in FIG. It is sectional drawing which follows the arrow line IV-IV of the housing | casing shown in FIG. It is a front view of the cover body of the cover body unit shown in FIG. It is sectional drawing which follows the arrow line VI-VI of the cover body shown in FIG. It is sectional drawing which follows the arrow VII-VII of the cover body shown in FIG. It is sectional drawing of the state which assembled the housing | casing lid stop structure shown in FIG. It is explanatory drawing which shows the outline | summary in the case of attaching a cover body to the housing | casing shown in FIG. It is explanatory drawing of the latching | locking part and engaging part at the time of mounting | wearing with the cover body to the housing | casing shown in FIG. It is sectional drawing which shows the modification of this invention. It is explanatory drawing in the case of mounting | wearing and fixing a cover body to a housing | casing in the conventional housing | casing lid stop structure. It is explanatory drawing which shows the other example of the structure which mounts and fixes a cover body to a housing | casing. It is explanatory drawing which shows the other example of the structure which mounts and fixes a cover body to a housing | casing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case lid stop structure 2 Photoelectric sensor 2a Front 3 Cable 11 Case (housing)
11a Front surface 11b Side surface 11c Upper surface, lower surface (outer surface)
11d rear surface 11e corner 11f opening 11g window (opening)
11h, 11h 'hole (opening)
11i Insertion hole 11j, 11m Groove 11k, 11n, 11p Edge (concave part)
11s Locking claw 11t Locking groove 13, 14, 15 Lid unit 21, 24, 28 Engaging recess 22, 25, 27 Locking claw 21a End 22a Upper surface 22b Edge (end surface)
31, 36 Packing (seal member)
32 Presser plate 33, 38, 43 Lid (cover)
33a, 38a, 43a Central part 33b, 38b, 43b Side part 33c, 33d, 38c, 43c Hole 33e, 38e, 43e Engaging convex part 33f, 38f, 43f Locking hole 33g Open end face 33h End part 35 Rubber seal 35a, 35b Hole (window)
35c Partition wall 37 Holding plate (glass)
41 Rubber bushing 41a Large diameter part 41b Small diameter part 41c Hole 42 Holding ring 51 Cover (cover)
51a Center part 51b Side part 51c, 51d Locking claw 61, 63, 65 Case 62, 64, 66 Cover 61a, 62a, 63a, 64a, 65a, 66a Side part 61b, 64b, 66b Locking claw 62b Locking hole 61c 63c, 65c Opening 63b, 65b Locking recess

Claims (4)

A housing that houses an object to be waterproofed, a seal member that is attached to the opening of the housing, a pressing plate that liquid-tightly closes the opening through the sealing member, and the pressing member that is pressed against the sealing member A housing lid stopper structure comprising a central portion that presses the plate and a lid body that is bent substantially at right angles to one side and is attached and locked to the outer surface of the housing,
Forming two engaging portions between the housing and the lid;
The first engaging portion is engaged with the locking portion formed on the outer surface of the housing and the locking portion formed on the side portion of the lid body when the lid body is attached to the opening. And a locking portion for locking the lid to the housing.
The second engagement portion is formed on either the outer surface of the housing or the side portion of the lid, and a convex portion that separates the tip of the side from the outer surface of the housing when the lid is attached, The outer surface of the housing and the side portion of the lid body are formed on the other side, and the concave portion that engages with the convex portion when the lid body is attached to the opening,
When the lid is aligned with the opening of the housing and pushed in the mounting direction, both sides of the lid are expanded outward from the base by the convex portions of the second engaging portion, and the tip of the side is By separating from the outer surface of the housing and the locking portion, the tip of the side portion does not interfere with the housing during the operation of pushing the lid into the housing opening , and
The first engaging portion and the second engaging portion are arranged such that one of the engaging portions is recessed by a predetermined distance from the other in the mounting direction of the lid with respect to the housing opening . A housing lid stop structure. A housing that houses an object to be waterproofed, a seal member that is attached to the opening of the housing, a pressing plate that liquid-tightly closes the opening through the sealing member, and the pressing member that is pressed against the sealing member A housing lid stopper structure comprising a central portion that presses the plate and a lid body that is bent substantially at right angles to one side and is attached and locked to the outer surface of the housing,
Forming two engaging portions between the outer surface of the opening of the housing and the side of the lid;
The first engaging portion is engaged with the locking claw formed on the outer surface of the housing and the locking claw formed on the side of the lid when the lid is attached to the opening. And a locking hole
The second engaging portion is formed to bulge inwardly on the side portion of the lid, and when mounted on the opening portion, the second engaging portion rides on the outer surface of the housing and widens the side portion to the outside so that the tip is extended to the housing. An engaging convex portion that is separated from the outer surface of the body and the locking claw, and an engaging concave portion that is formed on the outer surface of the housing and engages with the engaging convex portion when the lid is attached to the opening. Become
When the lid is aligned with the opening of the housing and pushed in the mounting direction, the engaging convex portion bulging inward of the side of the lid hits the outer end surface of the opening, and when pushed further, the Engaging protrusions run on the outer surface of the housing, and accordingly, the both side portions open outward from the base and the tip of the side portion is separated from the outer surface of the housing and the locking claw. During the operation of pushing the lid into the opening, the front end of the side portion is prevented from interfering with the housing, and the first engaging portion and the second engaging portion are in contact with the housing opening. housing Karadafutatome structure either one of the engaging portion you characterized in that it is arranged recessed by a predetermined distance from the other with respect to the mounting direction of the lid. The engagement convex portion applies stress to the side portion of the lid body in a direction in which the engagement between the locking claw and the locking hole of the first engagement portion is strengthened, and engages with the engagement concave portion. The housing lid stopper structure according to claim 2, characterized in that it is characterized in that : The engaging convex portion is formed in a curved surface along the mounting direction of the lid, and the engaging concave portion is formed in a substantially trapezoidal shape along the mounting direction, and the engaging convex is formed at the end on the back side in the mounting direction. end of the mounting direction rear side parts is characterized that you contact, housing Futatome structure according to claim 2 or claim 3.

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