JP2012202903A - Case assembling structure and pressure gauge using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembling workability of a case body.SOLUTION: A pressure gauge 10 has: a resinous front surface side case half body 24 provided with an opening portion 36 on a back surface side; and a resinous back surface side case half body 25 to which a fixing plate 13 of a pressure gauge body 12 is attached, and which is assembled in the opening portion 36 of the front surface side case half body 24. Engaging tongue pieces 30a and 30b entering the inside of the front surface side case half body 24 when the back surface side case half body 25 is assembled in the front surface side case half body 24 are provided on the back surface side case half body 25. Engaging protrusions 31 engaging with the fixing plate 13 when the fixing plate 13 is attached to the back surface side case half body 25 are provided on inner surfaces of the engaging tougue pieces 30a and 30b. Outer surfaces of the engaging tongue pieces 30a and 30b are covered by the front surface side case half body 24.

Description

  The present invention relates to a case assembly structure for assembling a case body that accommodates an object to be accommodated, and a pressure gauge using the same.

  For example, a precision instrument such as a pressure measuring instrument is covered with a case so that dust, water droplets, etc. do not adhere to it, and Patent Document 1 discloses a pressure gauge in which a pressure measuring instrument is accommodated in a resin case. Are listed.

  This pressure gauge has a substantially rectangular parallelepiped-shaped resin case opened on the back side, and a resin support plate abutted against the back side of the case. A pressure measuring device is fixed to the support plate, and the pressure measuring device is housed inside the case by assembling the case and the support plate together.

JP 2010-185666 A

  Conventionally, when a pressure measuring device is fixed to a support plate in this way, a metal fixing plate to which the pressure measuring device is assembled is screwed to the support plate, so that the assembly work of the pressure gauge is complicated. It was.

  An object of the present invention is to improve the assembly workability of the case body.

  The case assembly structure of the present invention includes a resin first case half provided with an opening opening on one side, and a resin second case half incorporated in the opening of the first case half. An object to be accommodated in a case body attached to the second case half body and formed by the first case half body and the second case half body, and provided in the second case half body An engagement tongue piece that enters the first case half body when the second case half body is incorporated into the first case half body, and an inner surface of the engagement tongue piece; And an inner engagement portion that engages with the object to be accommodated when attached to the second case half, and the outer surface of the engaging tongue piece is covered with the first case half. To do.

  The case assembly structure of the present invention is characterized in that an outer engagement portion is provided on an outer surface of the engagement tongue piece, and an assembly engagement portion with which the outer engagement portion engages is formed on the first case half. To do.

  In the case assembly structure of the present invention, a slit is formed in the first case half adjacent to both sides of the assembly engagement portion, and the engagement portion provided with the assembly engagement portion is formed by the slit. It is formed in a case half.

  The case assembly structure of the present invention is characterized in that the engaging tongue piece is provided on each of two opposite sides of the second case half.

  The case assembly structure of the present invention is characterized in that the first case half is formed with a pressing surface that abuts against the object to be accommodated from the front side.

  The pressure gauge of the present invention is a pressure gauge using any one of the above-described case assembly structures, wherein the pressure gauge as the object to be accommodated is provided with a pressure display portion on the front side and a fixed plate on the back side. A main body and a transparent cover that covers the pressure display portion are provided on the front side, the first case half body provided with the opening on the back side, the fixing plate is attached, and the first case half body The second case half incorporated in the opening, and the inner engagement portion engages with the fixing plate when the fixing plate is attached to the second case half. To do.

  According to the present invention, the inner engagement portion that engages with the object to be accommodated is provided on the inner surface of the engagement tongue piece, and the outer surface of the engagement tongue piece is covered by the first case half body. When the operation is completed, the engaging tongue piece is prevented from elastically deforming outward, and the container is prevented from being detached from the second case half. Thereby, after attaching a to-be-contained body to a 2nd case half, a 2nd case half is integrated in the opening part of a 1st case half with a to-be-contained body, and a to-be-contained body is easily fixed in a case body can do. Therefore, as compared with the conventional case where the object to be accommodated is fixed in the case by screw fastening, the assembling work of the case body is facilitated, and the number of parts can be reduced and the cost can be reduced. .

  According to the present invention, the assembly engagement portion that engages with the outer engagement portion provided on the outer surface of the engagement tongue piece is formed in the first case half. Engagement with the joint portion prevents the first case half body and the second case half body from being detached, and the case body can be reliably assembled.

  According to the present invention, the engagement portion provided with the assembly engagement portion is formed in the first case half by the slit formed in the first case half adjacent to both sides of the assembly engagement portion. Therefore, when the second case half is incorporated in the first case half, the engagement portion is elastically deformed outward, so that the engagement between the outer engagement portion and the assembly engagement portion is facilitated. It can be carried out. Therefore, the assembly workability of the case body can be further improved.

  According to the present invention, since the pressing surface of the first case half is abutted against the object to be accommodated from the front side, when the case body is attached to the attachment object by a fastening member such as a screw member, The fastening force applied to the first case half acts on the object to be accommodated via the pressing surface. As a result, it is possible to prevent the case body from being deformed by applying an excessive fastening force to the resin case body, so that the case body can be reliably sealed without deteriorating the sealing performance due to the deformation of the case body. It becomes possible to have sex.

It is a front view which shows the pressure gauge using the case assembly structure which is one embodiment of this invention. It is the perspective view which looked at the pressure gauge shown in FIG. 1 from the front side. It is the perspective view which looked at the pressure gauge shown in FIG. 1 from the back side. It is the disassembled perspective view which looked at the pressure gauge shown in FIG. 1 from the front side. It is the disassembled perspective view which looked at the pressure gauge shown in FIG. 1 from the back side. It is the perspective view seen from the front side which shows the state with which the pressure gauge main body and the back side case half were assembled | attached. It is sectional drawing which expands and partially shows the engagement structure of a stationary plate and a back side case half body. It is sectional drawing which expands and partially shows the engagement structure of a front side case half and a back side case half. It is sectional drawing which shows the modification of case assembly structure. It is sectional drawing which shows the other modification of a case assembly structure. It is sectional drawing which shows the other modification of a case assembly structure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The pressure gauge 10 is attached to a fluid pressure device constituting a fluid pressure circuit, and is used for measuring and displaying the pressure of the fluid supplied to the fluid pressure device. As shown in FIGS. 1 to 5, the pressure gauge 10 includes a case body 11 having a substantially rectangular parallelepiped shape, and a pressure gauge body 12 as a body to be housed in the case body 11.

  As shown in FIGS. 4 and 5, the pressure gauge main body 12 includes a fixed plate 13 made of a quadrilateral metal plate, and a pressure measuring instrument 14 assembled on the front side of the fixed plate 13. The pressure measuring instrument 14 has a flat Bourdon tube 15 bent in an arc shape, and the pressure gauge 10 is a Bourdon tube type pressure gauge. The Bourdon tube 15 has a proximal end portion fixed to the fixing plate 13 and a distal end portion connected to a pointer mechanism portion (not shown). In order to guide the fluid into the Bourdon tube 15, a fluid guide member 17 having a fluid guide hole 16 is attached to the fixed plate 13. The fluid guide member 17 passes through the fixed plate 13 and is fixed in a state in which an annular plate-shaped abutting portion 17 a provided at an end portion on the back side is abutted against the fixed plate 13 from the back side. The fluid guide hole 16 is formed to open to the back side. When the tip of the Bourdon tube 15 is displaced by the pressure of the fluid supplied into the Bourdon tube 15 through the fluid guide hole 16, the displacement is enlarged by the pointer mechanism and transmitted to a pointer rotation shaft (not shown). The

  A circular scale plate 18 is attached to the fixed plate 13 provided on the back side of the pressure gauge main body 12 as a pressure display portion so as to be positioned on the front side of the pressure measuring instrument 14. A pressure scale within a range that can be measured by the meter 10 is radially provided. As shown in FIG. 1, the pressure gauge 10 has a measurable range of 0 to 1.0 MPa, and in addition to the pressure scale, the scale plate 18 is provided with a number indicating a pressure value every 0.2 MPa. A pointer 19 is attached to the tip of the pointer rotation shaft that passes through the scale plate 18, and the pointer 19 rotates at an angle corresponding to the pressure of the fluid guided into the Bourdon tube 15. Accordingly, the pressure of the fluid to be measured is displayed to the observer by the position of the pointer 19 indicating the pressure scale attached along the turning locus of the pointer 19.

  The fixing plate 13 is formed in a quadrilateral shape corresponding to the shape of the case body 11, and insertion holes 20 that are cut out in a substantially circular shape are formed in two corners on one diagonal line. . In addition, a plurality of positioning holes 21 are formed in the fixed plate 13 so as to penetrate in parallel with the axial direction of the pointer rotation shaft.

  As shown in FIGS. 4 and 5, the case body 11 includes a resin-made front side case half 24 as a first case half covering the front side of the pressure gauge main body 12 and a back side of the pressure gauge main body 12. It is formed with the back side case half body 25 made of resin as the second case half body to be covered.

  The back-side case half 25 includes a quadrilateral back wall 26 facing the fixing plate 13 of the pressure gauge main body 12 from the back side, and the back wall 26 is formed larger than the fixing plate 13. A circular insertion hole 27 is formed in two corners on one diagonal line of the back wall 26 so as to correspond to the insertion hole 20 of the fixed plate 13 so as to be parallel to the axial direction of the pointer rotation shaft. Yes. In addition, a circular through hole 28 is formed in the back wall 26 in parallel with the axial direction of the pointer rotation shaft so as to correspond to the abutting portion 17 a of the fluid guide member 17 mounted on the fixed plate 13. In addition, a plurality of positioning protrusions 29 are provided so as to protrude from the rear wall 26 to the front side in correspondence with the positioning holes 21 of the fixing plate 13.

  Two corners on the other diagonal line of the back wall 26, that is, the corners on the side where the insertion hole 27 is not formed, are respectively engaged with a pair of engagements extending from the upper and lower side portions of the back wall 26 to the front side. Tongue pieces 30a and 30b are provided. The engaging tongue pieces 30a and 30b are elastically deformable so that their tip portions are displaced in the vertical direction, that is, inward and outward, and function as a so-called snap fit.

  On the inner surface of each engagement tongue piece 30a, 30b, an engagement protrusion 31 as an inner engagement portion protrudes. As shown in FIG. 7, the engagement protrusion 31 is inclined with respect to the inner surface of the engagement tongue pieces 30 a and 30 b at the inclined surface 31 a that is inclined inwardly toward the back surface side and the back surface side end portion of the engagement protrusion 31. It has a wedge shape with a stopper surface 31b extending vertically. The engaging protrusion 31 is provided at the tip of the engaging tongue pieces 30a and 30b. Similarly, on the outer surface of each engaging tongue piece 30a, 30b, an engaging protrusion 32 as an outer engaging portion is formed so as to protrude. The engaging protrusion 32 includes an inclined surface 32a that is inclined outward toward the back surface side, and a stopper surface 32b that extends perpendicularly to the outer surfaces of the engaging tongue pieces 30a and 30b at the back surface side end portion of the engaging protrusion 32. It has a wedge shape with. The engaging protrusions 32 are provided at the base end portions of the engaging tongue pieces 30a and 30b, respectively.

  The fixing plate 13 is attached to the back side case half 25 by abutting the fixing plate 13 of the pressure gauge main body 12 against the back side case half 25 from the front side. When the fixing plate 13 is attached to the back-side case half 25, the side surface of the fixing plate 13 is pressed against the inclined surface 31a of the engaging protrusion 31, and the fixing plate 13 is elastically deformed outward while the engaging tongue pieces 30a and 30b are elastically deformed outward. It approaches the back wall 26 of the back side case half 25. When the mounting of the fixing plate 13 to the back side case half 25 is completed, the elastic deformation of the engaging tongues 30a and 30b is restored, and the stopper surface 31b of the engaging protrusion 31 is opposed to the fixing plate 13. . FIG. 6 is a perspective view showing a state in which the pressure gauge main body and the back side case half are assembled from the front side. FIG. 7 is a cross-sectional view showing a partially enlarged engagement structure between the fixing plate and the back side case half, and shows a cross section of a portion A in FIG.

  As shown in FIG. 6, in a state where the fixing plate 13 is attached to the back side case half 25, the fixing plate 13 of the pressure gauge body 12 faces the back wall 26 of the back side case half 25 from the front side. Has been placed. And the pressure gauge main body 12 is positioned with respect to the back side case half 25 by inserting the positioning projection 29 of the back wall 26 into the positioning hole 21 of the fixed plate 13. Under this positioned state, the insertion hole 20 of the fixing plate 13 and the insertion hole 27 of the rear case half 25 are communicated coaxially with each other, and as shown in FIG. The abutting portion 17 a of the mounted fluid guide member 17 is fitted into the through hole 28 of the back wall 26. The abutting portion 17a and the through hole 28 form a pressure sealing member insertion recess that opens on the back side of the back side case half 25.

  As shown in FIG. 7, the engaging tongue pieces 30 a and 30 b extend to the front side with their inner surfaces facing the upper and lower side surfaces of the fixing plate 13, and the engaging protrusions 31 are on the front side of the fixing plate 13. Protrusively arranged. The stopper surface 31 b of the engaging protrusion 31 faces the fixing plate 13 from the front side, whereby the fixing plate 13 is engaged and fixed between the back wall 26 and the pair of engaging protrusions 31. When the fixing plate 13 is removed from the rear case half 25, a finger or a jig is hooked on the tip of the pair of engaging tongues 30a and 30b, and the engaging tongues 30a and 30b are directed outward. By elastically deforming, the engagement between the fixing plate 13 and the engaging projection 31 is released, so that the fixing plate 13 can be easily detached from the back side case half 25.

  On the other hand, the front case half 24 includes a quadrilateral front wall 34 facing the fixing plate 13 of the pressure gauge main body 12 from the front side, and up, down, left, and right extending from each side of the front wall 34 to the back side. It is provided with four side walls 35a to 35d, and has a substantially rectangular parallelepiped shape provided with an opening 36 opened on the back side. The front wall 34 is formed to be larger than the rear wall 26 of the back case half 25, and the back case half 25 is incorporated in the opening 36 of the front case half 24 together with the pressure gauge body 12. It has become. As shown in FIG. 5, circular accommodation holes 36 a for accommodating the pressure measuring device 14 are formed in the opening 36 of the front case half 24, and the four corners of the front case half 24 are formed. The wall thickness is thicker than other parts. In addition, the opening 36 of the front case half 24 is positioned on the back side with respect to the circular accommodation hole 36a to accommodate the fixing plate 13 and the back case half 25 with a quadrilateral accommodation hole 36b. Is formed.

  At two corners on one diagonal line of the front case half 24, circular insertion holes 37 corresponding to the insertion holes 27 of the back case half 25 are parallel to the axial direction of the pointer rotation shaft. It is formed through. Positioned around the insertion hole 37, the front wall 34 is formed with a rectangular cutout portion 38 into which a head of a fastening member (not shown) such as a screw member inserted into the insertion hole 37 from the front side enters. Yes.

  A circular transparent cover 39 is rotatably mounted on the front wall 34 in the circumferential direction, and the transparent cover 39 is formed of a resin material having transparency. As shown in FIG. 1, in a state where the pressure gauge main body 12 is accommodated in the case body 11, the scale plate 18 is covered from the front side by the transparent cover 39, and the scale plate 18 from the outside of the case body 11 through the transparent cover 39. And the pointer 19 can be visually recognized. The front wall 34 is provided with a working pressure display member 40 that is rotatably mounted along a pressure scale and a transparent cover 39 in order to display a working pressure range of the fluid supplied to the fluid pressure device. The non-transparent shielding part 41 is provided. By rotating the transparent cover 39 and the use pressure display member 40, an area of the use pressure display member 40 that is not covered by the shielding portion 41 is set, and the use pressure range is displayed to the observer by the area. . For example, in the state shown in FIG. 1, the working pressure range is set to 0 to 0.2 MPa.

  Two corners on the other diagonal line of the front case half 24, that is, the corner on the side where the insertion hole 37 is not formed correspond to the engaging tongues 30a and 30b of the back case half 25. Thus, a pair of engaging portions 42a and 42b are provided on the upper and lower side walls 35a and 35b, respectively. The engaging portions 42a and 42b are formed by a pair of parallel slits 43 formed in the upper and lower side walls 35a and 35b. The engaging portions 42a and 42b are elastically deformable so that the tip portions are displaced in the vertical direction, that is, inward and outward, and function as a so-called snap fit. A rectangular engagement hole 44 penetrating in the vertical direction of the engagement portions 42a, 42b is formed as an assembly engagement portion at the distal end portion of each engagement portion 42a, 42b. That is, the slits 43 are formed in the upper and lower side walls 35a and 35b of the front case half 24 adjacent to both sides of the engagement hole 44, so that the engagement portions 42a and 42b provided with the engagement hole 44 are slit. The front case half 24 is formed by 43. A stopper surface 44a extending perpendicularly to the inner surfaces of the engaging portions 42a and 42b is formed by the side surface on the back side of the engaging hole 44.

  The back-side case half 25 is opened to the front-side case half 24 by abutting the back-side case half 25 with the pressure gauge main body 12 temporarily fixed against the front-side case half 24 from the back side. It is incorporated in the part 36. When the back-side case half 25 is incorporated into the front-side case half 24, the tip ends of the engaging portions 42a and 42b are pressed against the inclined surface 32a of the engaging protrusion 32, and the engaging portions 42a and 42b are elastically deformed outward. The back side case half body 25 is brought close to the front side case half body 24. When the assembly of the front side case half 24 and the back side case half 25 is completed, the elastic deformation of the engaging portions 42a and 42b is restored, and the stopper surface 32b of the engaging protrusion 32 and the engaging hole 44 are The stopper surface 44a is opposed. FIG. 8 is a partially enlarged cross-sectional view of the engagement structure between the front case half and the back case half, and shows a cross section of portion B in FIG.

  As shown in FIG. 3, the pressure gauge main body 12 and the back side case half 25 are accommodated inside the front side case half 24 in a state where the back side case half 25 is incorporated in the front side case half 24. ing. As shown in FIG. 8, a pressing surface 45 (shown by hatching in FIG. 5) formed on the front case half 24 is abutted against the fixing plate 13 of the pressure gauge main body 12 from the front side. . Under this state, the insertion hole 37 of the front case half 24, the insertion hole 20 of the fixing plate 13, and the insertion hole 27 of the back case half 25 are coaxially connected to each other.

  The pressure gauge 10 is attached to the fluid pressure device by a fastening member that is inserted through the insertion holes 20, 27, and 37 from the front side. When the pressure gauge 10 is attached to the fluid pressure device, a pressure sealing member (not shown) such as an O-ring is attached to the pressure sealing member insertion recess formed on the back side of the back side case half 25. The pressure sealing member seals between the abutting portion 17a of the fluid guide member 17 and the mounting surface of the fluid pressure device, so that the fluid guide hole 16 of the pressure gauge 10 and the flow path in the fluid pressure device Are communicated in an airtight manner.

  As shown in FIG. 8, the engaging tongues 30a, 30b of the back case half 25 enter the inside of the front case half 24, and the front side faces the inner surfaces of the engaging portions 42a, 42b. It extends to. Since the stopper surface 32b of the engaging protrusion 32 provided on the engaging tongue pieces 30a and 30b faces the stopper surface 44a of the engaging hole 44 from the front side, the engaging protrusion 32 and the engaging hole 44 are mutually connected. Is engaged. Further, since the outer surfaces of the engaging tongue pieces 30a and 30b are covered with the inner surfaces of the engaging portions 42a and 42b, the engaging portions 42a and 42b may be elastically deformed outward. Is prevented. Therefore, in a state where the back side case half 25 is assembled to the front side case half 24, the engagement between the fixing plate 13 and the engagement protrusion 31 is not released, and the pressure gauge main body 12 is separated from the back side case half 25. It is prevented that the pressure gauge main body 12 falls off or is displaced with respect to the case body 11.

  In the pressure gauge 10 according to the present embodiment, the outer surfaces of the engaging tongue pieces 30a and 30b are covered by the engaging portions 42a and 42b via a predetermined gap. The fixing plate 13 may be firmly fixed to the back side case half 25 by pressing the tongue pieces 30a and 30b inward by the front case half 24. When removing the back side case half body 25 from the front side case half body 24, a finger or a jig or the like is hooked on the tip of the pair of engaging portions 42a and 42b, and the engaging portions 42a and 42b are directed outward. By elastically deforming, the engagement between the engagement protrusion 32 and the engagement hole 44 is released, so that the back side case half 25 can be easily removed from the front case half 24.

  As described above, in the pressure gauge 10 according to the present embodiment, the engagement protrusion 31 that engages the fixing plate 13 is provided on the inner surface of the engagement tongue pieces 30a and 30b, and the engagement tongue piece 30a is formed by the front-side case half 24. , 30b is covered. Accordingly, the engaging tongue pieces 30a and 30b are prevented from elastically deforming outward in a state where the assembly work of the case body 11 is completed, and the pressure gauge main body 12 is prevented from being detached from the back side case half body 25. . For this reason, after attaching the fixing plate 13 to the back-side case half 25, the back-side case half 25 is assembled into the opening 36 of the front-side case half 24 together with the pressure gauge main body 12, thereby It can be easily fixed in the case body 11. Therefore, it is not necessary to fasten the fixing plate with the pressure gauge measuring instrument assembled to the resin case with a screw member or the like as in the prior art, so compared to the case where the pressure gauge body is fixed to the case by screw fastening. The assembly work of the body 11 is facilitated, and the number of parts is reduced, so that the cost can be reduced.

  Moreover, in the pressure gauge 10 of this Embodiment, the engagement hole 44 engaged with the engagement protrusion 32 of engagement tongue piece 30a, 30b is formed in the front side case half body 24. As shown in FIG. The engagement between the engagement protrusions 32 and the engagement holes 44 prevents the assembly of the front case half 24 and the back case half 25 from being detached. It can be carried out.

  Further, in the pressure gauge 10 according to the present embodiment, the engagement portions 42a and 42b provided with the engagement holes 44 are formed by the slits 43 formed adjacent to both sides of the engagement holes 44. To be formed. Thereby, when the back side case half body 25 is assembled in the front side case half body 24, the engaging portions 42 a and 42 b are elastically deformed outward, so that the engagement protrusion 32 and the engagement hole 44 are Engagement can be performed easily. Therefore, the assembly workability of the case body 11 can be further improved.

  Furthermore, in the pressure gauge 10 of the present embodiment, the pressing surface 45 of the front case half 24 is abutted against the fixing plate 13 from the front side, so the pressure gauge 10 is attached by a fastening member such as a screw member. When attached to the fluid pressure device, the fastening force applied to the front case half 24 acts on the metal fixing plate 13 via the pressing surface 45. Thereby, since it can prevent that the case body 11 deform | transforms by applying excessive fastening force to the resin-made case body 11, the case body 11 does not produce deterioration of the sealing performance due to the deformation of the case body 11. It is possible to provide a reliable sealing property.

  Furthermore, in the pressure gauge 10 of the present embodiment, the fixing plate 13 is attached to the back side case half body 25 and the abutting portion 17a of the fluid guide member 17 and the through hole 28 are fitted to each other, whereby the back side case half A pressure sealing member insertion recess is formed on the back side of the body 25. Thus, by forming the shape for mounting the pressure sealing member on the case body 11, it is not necessary to form the shape for mounting the pressure sealing member on the fluid pressure device. The degree of design freedom can be improved.

  In the case assembly structure in the embodiment, the engagement protrusions 31 and 32 are provided on the engagement tongue pieces 30a and 30b as the inner engagement portion and the outer engagement portion, and the engagement hole 44 is provided as the assembly engagement portion. Although it formed in the engaging parts 42a and 42b, it is not limited to this. 9 to 11 are cross-sectional views showing modifications of the case assembly structure. 9 to 11, the same members as those described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the case assembly structure shown in FIG. 9, an engagement recess 50 as an inner engagement portion is formed on the inner surfaces of the engagement tongue pieces 30 a and 30 b of the back side case half 25. The engagement recess 50 opens inward at the base end portions of the engagement tongues 30a and 30b, and extends perpendicularly to the inner surfaces of the engagement tongues 30a and 30b by the front side surface of the engagement recess 50. A stopper surface 50a is formed. When the fixing plate 13 is attached to the back side case half 25, the fixing plate 13 is brought close to the back wall 26 of the back side case half 25 while elastically deforming the engaging tongue pieces 30a and 30b outward. Then, when the attachment of the fixing plate 13 to the back side case half 25 is completed, the elastic deformation of the engaging tongue pieces 30a and 30b is restored, and the side portion of the fixing plate 13 is inserted into the engaging recess 50, The stopper surface 50a of the engaging recess 50 is opposed to the fixed plate 13 from the front side. As a result, the fixing plate 13 is engaged between the back wall 26 and the stopper surface 50 a of the engaging recess 50.

  Thus, the engaging recess 50 that engages with the fixing plate 13 may be provided on the inner surface of the engaging tongue pieces 30a and 30b as an inner engaging portion. In the case assembly structure shown in FIG. 9, an engagement protrusion 32 as an outer engagement portion is provided on the outer surface of the engagement tongue pieces 30a and 30b, and an engagement as an assembly engagement portion is provided on the engagement portions 42a and 42b. A joint hole 44 is formed, and the front case half 24 and the back case half 25 are assembled by the same engagement structure as in FIG.

  In the case assembly structure shown in FIG. 10, engagement holes 51 as outer engagement portions are formed on the outer surfaces of the engagement tongue pieces 30 a and 30 b of the back side case half 25. The engagement hole 51 opens outward at the base end portions of the engagement tongue pieces 30a and 30b, and extends perpendicularly to the outer surfaces of the engagement tongue pieces 30a and 30b by the front side surface of the engagement hole 51. A stopper surface 51a is formed. On the other hand, on the inner surfaces of the engaging portions 42a and 42b of the front case half 24, an engaging projection 52 as an assembly engaging portion is formed so as to protrude. The engaging protrusion 52 includes an inclined surface 52a that is inclined inwardly toward the front side, and a stopper surface 52b that extends perpendicularly to the inner surfaces of the engaging portions 42a and 42b at the front end of the engaging protrusion 52. It has a wedge shape. The engaging protrusions 52 are provided at the tip portions of the engaging portions 42a and 42b, respectively.

  When the back-side case half 25 is assembled into the front-side case half 24, the inclined surface 52a of the engaging protrusion 52 of the engaging portions 42a and 42b is pressed against the tip end portions of the engaging tongue pieces 30a and 30b. The back-side case half 25 is brought close to the front-side case half 24 while elastically deforming the outer sides 42a and 42b. When the assembly of the front-side case half 24 and the back-side case half 25 is completed, the elastic deformation of the engaging portions 42 a and 42 b is restored, and the stopper surface 51 a of the engaging hole 51 is engaged with the engaging protrusion 52. By facing the stopper surface 52b from the front side, the engagement hole 51 and the engagement protrusion 52 are engaged with each other. Further, the engaging tongue pieces 30a, 30b enter the inside of the front case half 24, and the outer surfaces of the engaging tongue pieces 30a, 30b are covered with the inner surfaces of the engaging portions 42a, 42b. The engaging portions 42a and 42b prevent the elastic deformation of 30b toward the outside.

  In this manner, the engagement holes 51 as the outer engagement portions are formed on the outer surfaces of the engagement tongue pieces 30a and 30b, and the engagement protrusions 52 as the assembly engagement portions are provided in the engagement portions 42a and 42b. Also good. In the case assembly structure shown in FIG. 10, the engagement protrusions 31 as the inner engagement portions are provided on the inner surfaces of the engagement tongue pieces 30a and 30b. The engagement structure similar to that in FIG. Is attached to the rear case half 25.

  In the case assembly structure shown in FIG. 11, an engagement recess 50 as an inner engagement portion is formed on the inner surface of the engagement tongue pieces 30a, 30b of the back side case half 25, and the engagement tongue pieces 30a, 30b are formed. An engagement hole 51 as an outer engagement portion is formed on the outer surface. Further, on the inner surfaces of the engaging portions 42a and 42b of the front case half 24, an engaging protrusion 52 as an assembly engaging portion is provided. As described above, in the case assembly structure shown in FIG. 11, the fixing plate 13 is attached to the rear case half 25 by the engagement structure similar to FIG. 9, and the front case half by the engagement structure similar to FIG. The body 24 and the back case half 25 are assembled.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the engagement tongue piece 30a of the back side case half body 25 is provided by the engaging portions 42a and 42b formed on the side walls 35a and 35b of the front side case half body 24 by providing the slit 43. , 30b is covered, but the outer surfaces of the engaging tongue pieces 30a, 30b may be covered by the side walls 35a, 35b of the front case half 24 without providing the slit 43.

  In the above embodiment, the engaging tongue pieces 30a and 30b and the engaging portions 42a and 42b are provided on the upper and lower sides of the pressure gauge 10, respectively, but the engaging tongue pieces 30a and 30b and the engaging portion 42a are provided. , 42b may be provided on the left and right sides of the pressure gauge 10, respectively. In this way, the engaging tongue pieces 30a and 30b and the engaging portions 42a and 42b are provided on the opposite sides of the front case half 24 and the back case half 25, that is, on the upper and lower sides of the pressure gauge 10 or It is preferable to provide each on the right side.

10 Pressure gauge 11 Case body 12 Pressure gauge body (container)
13 Fixed plate 18 Scale plate (pressure display)
24 Front case half (first case half)
25 Back side case half (second case half)
30a, 30b Engagement tongue 31 Engagement protrusion (inner engagement part)
32 Engagement protrusion (outer engagement part)
36 opening 39 transparent cover 42a, 42b engagement part 43 slit 44 engagement hole (assembly engagement part)
45 Press surface 50 Engagement recess (inner engagement part)
51 engagement hole (outer engagement part)
52 Engagement protrusion (assembly engagement part)

Claims (6)

A first case half made of resin provided with an opening opening on one side;
A second case half made of resin incorporated into the opening of the first case half;
An object to be accommodated in a case body attached to the second case half body and formed by the first case half body and the second case half body;
An engagement tongue provided in the second case half and entering the inside of the first case half when the second case half is incorporated into the first case half;
An inner engaging portion that is provided on an inner surface of the engaging tongue piece and engages the object to be accommodated when the object to be accommodated is attached to the second case half.
A case assembly structure, wherein an outer surface of the engaging tongue piece is covered with the first case half.   The case assembly structure according to claim 1, wherein an outer engagement portion is provided on an outer surface of the engagement tongue piece, and an assembly engagement portion with which the outer engagement portion engages is formed on the first case half. Characteristic case assembly structure.   3. The case assembly structure according to claim 2, wherein a slit is formed in the first case half adjacent to both sides of the assembly engagement portion, and the engagement portion provided with the assembly engagement portion is formed by the slit. A case assembly structure characterized by being formed in a first case half.   The case assembly structure according to any one of claims 1 to 3, wherein the engaging tongue piece is provided on each of two opposite sides of the second case half.   5. The case assembly structure according to claim 1, wherein the first case half is formed with a pressing surface that abuts against the object to be received from the front side. Case assembly structure. A pressure gauge using the case assembly structure according to any one of claims 1 to 5,
A pressure gauge main body as the object to be accommodated provided with a pressure display part on the front side and a fixed plate on the back side;
A transparent cover that covers the pressure display part is provided on the front side, and the first case half is provided with the opening on the back side;
The fixing plate is attached, and the second case half is incorporated in the opening of the first case half,
The pressure gauge, wherein the inner engagement portion engages with the fixing plate when the fixing plate is attached to the second case half.

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