JP2012141049A - Hinge structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinge structure in which a cover or a casing is prevented from breaking when the cover is to be excessively opened over a full-open state, and the cover is prevented from missing.SOLUTION: The hinge structure includes: a pair of shaft members 11a, 11b constituting both ends of a turning shaft of a cover 10; and a pair of bearings 21a, 21b which is provided on the casing 20, into which the shaft members 11a, 11b are fitted, respectively, and thereby, which tunrably support the shaft members 11a, 11b. A chamfered portion 111 is formed in only one member (11b) of the shaft members 11a, 11b, in a direction in which a cover surface for closing an opening of the casing 20 is directed when the cover 10 is at a closed position, and at a portion in contact with an inner circumference surface of the corresponding bearing 21b when the cover 10 is at a full-open position.

Description

  The present invention relates to a hinge structure of a case and a cover.

  As a conventional example of a hinge structure that supports a cover to be openable and closable with respect to a casing (case) of a device such as a watt-hour meter, the techniques described in Patent Documents 1 and 2 below (hereinafter, “Conventional Example 1”, respectively) And “Conventional Example 2”).

  In Patent Documents 1 and 2, columnar protrusions provided on both ends of one side (short side) of a rectangular cover, and a protrusion corresponding to the protrusions are provided on the housing. Each hole to be fitted is described. Each protrusion is rotatably supported in a state where it is fitted in the hole, so that the cover can be opened and closed (swinged) with each protrusion serving as a rotation shaft.

  Here, in Conventional Example 1, the length of each protrusion in the rotational axis direction is set to be relatively short so as to be shallowly engaged with the hole. As a result, when the cover is in the open position and receives an impact from the outside, the cover is easily detached from the housing, so that breakage at the engaging portion between the cover and the housing can be prevented. On the other hand, in Conventional Example 1, when the cover is in the closed position, another protrusion provided on the cover is fitted to the housing so that the cover is not easily removed when the cover is in the closed position. An arcuate guide groove is provided.

  On the other hand, in Conventional Example 2, chamfering is performed on a part of each protrusion that forms the rotation axis of the cover, specifically, a half of a cylinder facing the inside of the housing when the cover is in the closed position, and The hole into which the protruding portion is fitted is set to a “hole shape” long hole in a side view of the housing. As a result, even if the cover is opened more than necessary and an excessive force is applied to the engaging portion, each protrusion moves while sliding on the inner wall of the elongated hole, and finally the cover is detached from the elongated hole through the chamfered portion. . Therefore, it is possible to prevent the engaging portion from being damaged.

Japanese Patent Laid-Open No. 9-210046 Japanese Patent Laid-Open No. 5-113452

  However, in the above-described conventional examples 1 and 2, each protrusion that forms the rotation axis of the cover has a shape (a chamfered portion) that is easily detached from each corresponding hole at a position where the cover is completely opened to the limit (fully opened position). )have. Therefore, the cover may be completely separated from the housing by the impact when the cover is removed (for example, it may fly away in the direction other than the impact when the cover is removed), and the cover may be lost. There is.

  Therefore, one of the objects of the present invention is to prevent the cover and the housing from being damaged when the cover is about to be opened beyond the fully open position, and to prevent the cover from being lost. It is in.

  In addition, the present invention is not limited to the above-described object, and other effects of the present invention can be achieved by the functions and effects derived from the respective configurations shown in the embodiments for carrying out the invention which will be described later. It can be positioned as one of

  One aspect of the hinge structure of the present invention is a hinge structure of a housing assembly comprising: a case having an opening; and a cover that covers the opening and is rotatably attached to one end of the opening. A pair of shaft members forming both ends of the rotation shaft of the cover, and a pair of bearing portions provided in the case, each of which is fitted with the shaft member and rotatably supports the shaft member, Only in one of the shaft members, the cover surface that closes the opening in the closed position of the cover is in the direction that faces, and the portion that contacts the corresponding inner peripheral surface of the bearing portion in the fully opened position of the cover. A chamfered portion is provided.

  Here, the case includes a guide portion that extends from the bearing portion into which the shaft member is fitted in a direction in which the chamfered portion faces in the fully open position of the cover, and guides the shaft member that is off the bearing portion. May be.

  The case may further include a protrusion that contacts the surface of the cover when the cover is fully open.

  Furthermore, the cover may include a notch that opens in a direction in which the cover surface that closes the opening in the closed position faces.

  Further, the protrusion may be provided at a position corresponding to the center of the width in the length direction of the rotation shaft of the cover or the vicinity thereof.

  Further, the notch portion may be provided at a position corresponding to the center of the width of the rotating shaft in the length direction of the cover or the vicinity thereof.

  Moreover, the said hinge structure may have the latching structure which fastens the said cover to a specific open angle with respect to the said case.

  Here, the locking structure is provided on the cover, and is provided on the case at a projecting portion that protrudes in a direction in which the cover surface that closes the opening at the closed position faces, and at the opening angle. A locking portion that engages with the protrusion of the cover at a locked position to lock the cover.

  Further, the case is configured to move away from the rotation shaft according to the pressure received from the protrusion while the locking portion engages with the protrusion as the cover rotates to the open angle. You may have a part to elastically deform.

  Further, the elastically deforming portion may include a slit whose opening size is deformed in a direction away from the rotating shaft in accordance with the pressure.

It is a typical perspective view showing an example of appearance of storage assembly 1 provided with a hinge structure of a cover concerning an embodiment. (A) is a schematic plan view of the housing assembly illustrated in FIG. 1, (b) is a cross-sectional view taken along line DD in (a), (c) is a side view taken along arrow A in (a), and (d). (A) is a B arrow side view, (e) is an EE arrow sectional view in (a). (A) And (b) is a partial expanded sectional view which expands and shows the part enclosed by frame C1 and C2 in Fig.2 (a), respectively. (A) is a schematic plan view of the case illustrated in FIG. 1 and FIG. 2, (b) is a side view taken along the arrow A in (a), (c) is a sectional view taken along the line DD in (a), d) is a side view as viewed from arrow B in (a). (A) is a schematic plan view of the cover illustrated in FIGS. 1 and 2, (b) is a side view as viewed from the arrow A in (a), (c) is a side view as viewed from the arrow B in (a), (d) (A) is a side view taken in the direction of arrow C, and (e) is a cross-sectional view taken in the direction of arrow EE in (a). FIG. 3 is a side view of the storage assembly corresponding to FIG. (A) is a schematic plan view of the case which concerns on a modification, (b) is a B arrow side view in (a). (A) is a typical back view of the cover which concerns on a modification, (b) is the A arrow side view in (a), (c) is the B arrow side view in (a). It is a side view which shows typically a mode when the cover concerning a modification is in a locked state.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described below. In other words, the present invention can be implemented with various modifications (combining the embodiments, etc.) without departing from the spirit of the present invention. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. The drawings are schematic and do not necessarily match actual dimensions and ratios. In some cases, the dimensional relationships and ratios may be different between the drawings.

  FIG. 1 is a schematic perspective view showing an external appearance example of a housing assembly 1 having a cover hinge structure according to an embodiment. 2 (a) is a schematic plan view of the housing assembly 1, FIG. 2 (b) is a sectional view taken along the line DD in FIG. 2 (a), and FIG. 2 (c) is A in FIG. 2 (a). An arrow side view, FIG.2 (d) is a B arrow side view in Fig.2 (a), FIG.2 (e) is EE arrow sectional drawing in Fig.2 (a). 3 (a) and 3 (b) are partial enlarged cross-sectional views showing the portions surrounded by the frames C1 and C2 in FIG. 2 (a), respectively.

  As shown in FIGS. 1 and 2, the housing assembly 1 exemplarily has a rectangular parallelepiped shape as a whole, a case 20 having a housing portion (space) inside, and an opening (housing portion) of the case 20. And a cover 10 for covering the above. The container accommodated in the case 20 is not particularly limited, but is illustratively an input / output (I / O) module (for example, including a display and a setting panel) of a measuring instrument such as a flow meter. The cover 10 and the case 20 are obtained by molding a resin such as plastic as a non-limiting example.

  FIG. 4 shows a configuration example of the case 20, and FIG. 5 shows a configuration example of the cover 10. 4A is a schematic plan view of the case 20, FIG. 4B is a side view taken along the arrow A in FIG. 4A, and FIG. 4C is a cross-sectional view taken along the line DD in FIG. FIG. 4 and FIG. 4D are side views as viewed in the direction of arrow B in FIG. On the other hand, FIG. 5A is a schematic plan view of the cover 10, FIG. 5B is a side view as viewed from the arrow A in FIG. 5A, and FIG. 5C is a side view as viewed from the arrow B in FIG. FIG. 5 (d) is a side view taken along the arrow C in FIG. 5 (a), and FIG. 5 (e) is a sectional view taken along the line EE in FIG. 5 (a).

  As shown in FIG. 4, the case 20 has, for example, a rectangular parallelepiped shape having an opening 200 on the upper surface in plan view. As illustrated in FIGS. 2 and 4, the case 20 includes side walls 20 b and 20 c that form two opposing long sides, side walls 20 d and 20 e that form two opposing short sides, and a bottom portion 20 f that forms the bottom of the case 20. It has. A space (concave portion) defined by these side walls (hereinafter also referred to as “case side walls”) 20b to 20e and a bottom portion (hereinafter also referred to as “case bottom portion”) 20f serves as a housing portion.

  A pair of shaft members 11 a and 11 b (see FIGS. 3 and 5) that form a rotation shaft of the cover 10 are fitted to the side walls 20 b and 20 c that form the long side of the case 20, and the shaft member (hereinafter referred to as “cover shaft”). It is also possible to provide a pair of bearing portions 21a and 21b that rotatably support 11a and 11b according to the opening / closing motion (swing) of the cover 10. The bearing portions (hereinafter also referred to as “case bearing portions”) 21a and 21b may be holes that penetrate the case side walls 20b and 20c, or may be recesses that do not penetrate the case side walls 20b and 20c.

  Of the two opposing side walls 20d and 20e that form the short side of the case 20 in plan view, the case side wall 20d closer to the bearing portions 21a and 21b has a limit that allows the cover 10 to be opened with respect to the case 20 (fully open). Positioning as a stopper that defines the position). Therefore, the angle formed by the cover 10 and the case 20 when the cover 10 is in the fully open position is the cover fully open angle.

  For example, when the case side wall 20d extends vertically from the case bottom 20f to the vicinity of the case bearing portions 21a and 21b, the position where the cover surface 10a contacts the upper end surface of the case side wall 20d is the fully open position of the cover 10. At this time, when the angle formed by the cover 10 and the case 20 in a state where the cover 10 is completely closed (closed position) is 0 °, the cover 10 has an angle range of about 0 ° to 180 ° with respect to the case 20. It can be opened and closed (oscillated).

  Here, the fully open position (cover full open angle) of the cover 10 can be changed by appropriately changing the shape of the case side wall 20d functioning as a stopper. As a non-limiting example, as shown in FIGS. 1, 2, and 4, the case sidewall 20 d has an inclination angle (assumed to be “α”) that is less than 90 ° with the case bottom 20 f. An inclined surface 210 is provided. In this case, since the cover 10 can be opened until the cover surface 10a contacts the inclined surface 210, the cover 10 can be opened and closed with respect to the case 20 in an angle range of 0 ° to (180 ° + α).

  In the structure in which the cover 10 is inserted with respect to the case 20, as illustrated in FIGS. 4A and 4C, the cover 10 is placed on the inner wall surface of the case side walls 20b to 20e in the closed position. At some point, a step 215 that supports the cover 10 in contact with the peripheral edge of the cover back surface 10f can be provided.

  Next, as shown in FIGS. 2 and 5, the cover 10 exemplarily has a rectangular shape corresponding to the shape of the opening 200 of the case 20 and is a flat plate member as a whole. The cover 10 includes a cover surface 10a, a cover back surface 10f, cover side portions 10b and 10c that form two opposing long sides, and cover side portions 10d and 10e that form two opposing short sides.

  The above-described cover shafts 11 a and 11 b can be provided on both cover side portions 10 b and 10 c that form the long side of the cover 10 exemplarily. As a non-limiting example, the cover shafts 11 a and 11 b can be provided on one of the cover side portions 10 d and 10 e that form the short side of the cover 10 (for example, the cover side portion 10 d). For example, as shown in the side views of FIGS. 5B and 5D, the cover side portion 10d can be a flange portion having a curved surface that communicates from the cover surface 10a to the cover back surface 10f. The curved surface of the flange portion can be set to have a curvature corresponding to the diameters of the cover shafts 11a and 11b.

  Each of the cover shafts 11a and 11b has a generally cylindrical shape, but on one side (for example, the cover shaft 11b), the cover 10 is illustrated as illustrated in the partially enlarged sectional view of FIG. As shown in FIG. 1, when chamfering is performed on a portion facing the cover surface (back surface of the cover) 10f that closes the opening 200 of the case 20 (in other words, a portion facing the case bottom portion 20f) when in the closed position. preferable. That is, the chamfered portion 111 faces in a direction in which the chamfered portion 111 is in contact with the inner peripheral surface of the case bearing portion 21b when the cover 10 is in the fully open position.

  As a result, when the cover 10 reaches the fully open position, the chamfered portion 111 of the cover shaft 11b comes into contact with the inner peripheral surface of the cover bearing portion 21b, and the cover 10 is excessively opened beyond the fully open position. Even if force is applied to the cover shafts 11a and 11b and the case bearing portions 21a and 21b (hereinafter collectively referred to as “engagement portions”), before the engagement portions are damaged, the case bearing portions 21b The cover shaft 11b is detached from the case bearing portion 21b through the chamfered portion 111 of the one cover shaft 11b that is in contact with the inner peripheral surface. Therefore, it is possible to reduce the necessity of parts replacement due to breakage, thereby reducing the cost and time of parts replacement.

  On the other hand, as illustrated in the partially enlarged cross-sectional view of FIG. 3B, the other cover shaft 11a is not chamfered. That is, the cover shaft 11a has an outer peripheral surface corresponding to the inner peripheral surface of the corresponding case bearing portion 21a. Therefore, the fitting state between the cover shaft 11a and the corresponding case bearing portion 21a is easily maintained well regardless of the position of the cover 10 between the closed position and the fully opened position.

  Therefore, even if one cover shaft 11b is detached from the case bearing portion 21b through the chamfered portion 111 as described above, the other cover shaft 11a remains fitted to the case bearing portion 21a. The cover shaft 11a is detached from the case bearing portion 21a after being detached from the portion 21b. Therefore, it is possible to suppress a situation in which the cover 10 is completely separated instantaneously from the case 20 and the cover 10 is lost.

  When the detached cover 10 is attached to the case 20, the cover shaft 11a without the chamfered portion 111 is first fitted into the case bearing portion 21a in the orientation when in the closed position as shown in FIG. Thereafter, when the cover 10 is pushed from the front of the case 20, the chamfered portion 111 of the cover shaft 11b comes into contact with the case side wall 20c of the case 20, so that the cover shaft 11b can be easily fitted to the case bearing portion 21b through the chamfered portion 111. be able to.

  The chamfered portion 111 of the cover shaft 11b may be a flat surface or a curved surface that makes it easier for the cover shaft 11b to be detached from the case bearing portion 21b. As shown in FIG. 4C, the inner wall surface of the case side wall 20c provided with the case bearing portion 21b corresponding to the cover shaft 11b is provided as a non-limiting example from the case bearing portion 21b to the case side wall 20c. You may provide the hollow part 213 which expands in fan shape toward the corner | angular part 212 of this.

  In other words, the recessed portion 213 extends in a direction in which the chamfered portion 111 of the cover shaft 11b faces in the fully open position of the cover 10, and functions as a guide portion that guides the cover shaft 11b that is detached from the case bearing portion 21b. That is, when the cover shaft 11b is removed from the case bearing portion 21b through the chamfered portion 111 in an attempt to open the cover 10 beyond the fully open position of the cover 10, the cover shaft 11b is guided within the formation range of the recessed portion 213 to form the case side wall. It will come off from the inner wall surface of 20c.

  Accordingly, the cover shaft 11b is easily detached from the case 20 in a certain range depending on the shape of the guide portion 213, and the cover 10 is dropped from the case 20 in an unexpected direction and the cover is lost. Can be further suppressed. In addition, it is not necessary to provide a hollow part (guide part) in case side wall 21b provided with the other case bearing part 21a.

  When the detached cover 10 is attached to the case 20, the cover shaft 11a without the chamfered portion 111 is first fitted into the case bearing portion 21a in the orientation when in the closed position as shown in FIG. Thereafter, when the cover 10 is pushed from the front of the case 20, the chamfered portion 111 of the cover shaft 11b comes into contact with the case side wall 20c of the case 20, and then the cover shaft 11b is guided toward the case bearing portion 21b through the guide portion 213. Therefore, the cover shaft 11b can be easily fitted into the case bearing portion 21b.

  Further, the ease of detachment of the cover shaft 11b from the case bearing portion 21b through the chamfered portion 111 is the angle formed by the chamfered portion 111 and the inner peripheral surface of the case bearing portion 21b in the partial enlarged sectional view of FIG. It can be adjusted by adjusting (the chamfer angle β). Therefore, for example, when the strength of the cover shafts 11a and 11b and the case bearing portions 21a and 21b is weak, the chamfer angle β is set large, and conversely, when the strength is strong, the chamfer angle β is set small. it can. As a non-limiting example, the chamfer angle β may be set to 40 ° or more.

  Further, a protrusion 211 may be provided on the case side wall 20d (for example, the inclined surface 210) that functions as a stopper. As a non-limiting example, as shown in FIGS. 1, 2 (d), 4 (a), and 4 (d), the protrusion 211 is formed at the center in the width direction of the inclined surface 210 of the case side wall 20 d or It can be provided in the vicinity thereof.

  By providing the protruding portion 211, when the cover 10 is about to be opened beyond the fully open position, the cover 10 (cover surface 10a) bends so that the protruding portion 211 serves as a fulcrum. Therefore, even when the chamfering angle β of the cover shaft 11b is the same, the cover shaft 11b can be easily detached from the case bearing portion 21b when the protrusion 211 is provided.

  Other structures may be applied as long as the cover 10 can be bent and the cover shaft 11b can be easily detached from the case bearing portion 21b. For example, as an alternative or in addition, the protrusion may be provided on the cover 10 side.

  Further, as illustrated in FIGS. 2D, 2E, 5C, and 5E, the cover side portion (flange portion) on which the cover shafts 11a and 11b are provided. In a position corresponding to the center of the width of the rotating shaft 10d in the length direction or in the vicinity thereof, a cover is opened in a direction in which the cover back surface 10f, which is a surface for closing the opening 200 of the case 20 in the closed position of the cover 10, faces. A notch (slit) 110 may be provided. By providing the slit 110 in the cover side portion 10d, the cover 10 (cover side portion 10d) is more easily bent in the direction in which the opening width of the slit 110 is expanded or contracted.

  Therefore, for example, by providing the slit 110 at a position corresponding to the protruding portion 211 described above, the cover 10 (the cover side portion 10d) is arranged in a direction in which the opening width of the slit 110 widens with the protruding portion 211 serving as a fulcrum. It can be bent more greatly. As a result, the cover shaft 11b can be more easily detached from the case bearing portion 21b than when the slit 110 is not provided.

  A plurality of slits 110 may be provided on the cover side portion 10d. Further, instead of providing the slit 110 in the cover side portion 10d, the cover 10 can be easily bent by reducing the thickness of the cover side portion 10d entirely or partially. However, in this case, for example, as illustrated in FIG. 6, the gap 300 generated between the cover 10 and the case 20 in a side view from the cover side portion 10 d side becomes large. Therefore, providing the slit 110 as described above has less influence on the appearance and good design. It is also preferable from the viewpoint of protecting the inside of the case 20.

  Furthermore, it is also conceivable to make the case 20 relatively flexible than the cover 10 (for example, providing a slit in the bottom 20f of the case 20). However, the cover 10 is more flexible and has less influence on the appearance and better design.

(Modification)
In the housing assembly 1 described above, for example, an engagement that can be maintained (latched) while the cover 10 is kept open at an opening angle of 90 ° to 180 ° (hereinafter also referred to as “locking state”). A stop structure (latch mechanism) may be provided.

  A non-limiting example of the locking structure is shown in FIGS. FIG. 7A is a schematic plan view of the case 20, and FIG. 7B is a side view taken along the arrow B in FIG. 7A. 8A is a schematic rear view of the cover 10, FIG. 8B is a side view as viewed from the arrow A in FIG. 8A, and FIG. 8C is a side view as viewed from the arrow B in FIG. 8A. is there. FIG. 9 is a side view schematically showing a state where the cover 10 is in the locked state. In FIGS. 7 to 9, the parts denoted by the same reference numerals as those described above are the same or similar parts as those described above unless otherwise specified.

  As illustrated in detail in FIG. 9, the case 20 includes, for example, a flange of the cover 10 when the cover 10 is at a specific opening angle γ (0 ° <γ <180 °, for example, γ = 100 °). For example, the case side wall 20d may be provided with a locking portion (stopper) 222 that engages with the protrusion 112 provided on the portion 10d and keeps the cover 10 open to the open angle against its own weight. it can.

  The protrusion part 112 of the cover 10 can be provided in the position of the flange part 10d corresponding to the width center of the length direction of the rotating shaft of the cover 10 or its vicinity, as illustrated in FIG. On the other hand, as illustrated in FIG. 7, the stopper 222 of the case 20 corresponds to a position that can be engaged with the projection 112, for example, the center of the width of the rotation axis of the cover 10 or the vicinity thereof. It can be provided at the position of the side wall 20d. However, the protrusion 112 of the cover 10 and the stopper 222 of the case 20 are not necessarily arranged at the same position in the length direction of the rotation axis of the cover 10.

  As shown in FIG. 9, the protrusion 112 of the cover 10 protrudes in the radial direction of the rotation shaft of the cover 10 as a non-limiting example, and the opening 200 of the case 20 when the cover 10 is in the closed position. A surface 114 facing in the direction in which the cover back surface 10f faces (the direction toward the case bottom 20f) and a surface 113 facing inward of the case 20 when the cover 10 is at a specific opening angle γ. In addition, you may chamfer the edge part which the surface 113 and the surface 114 comprise.

  The cover 10 can remain at a specific opening angle against its own weight by the pressure received from the stopper when the surface 113 of the protrusion 112 is engaged with the stopper 222 of the case 20 (case side wall 20d).

  Here, as illustrated in FIG. 7, the case side wall 20 d may be provided with a slit 223 that partially extends in a direction along the rotation axis of the cover 10. The slit 223 facilitates elastic deformation of the case side wall 20d in the height direction.

  For example, as schematically illustrated in FIG. 9, when the cover 10 is opened toward a specific opening angle, the surface 114 of the two surfaces 113 and 114 forming the protrusion 112 of the cover 10 is From the state facing the stopper 222 to the state where the surface 113 faces the stopper 222, the two surfaces 113 forming the protrusion 112 and the side portion formed by the surface 114 move while engaging the stopper 222.

  In the meantime, the case side wall 20d is elastically deformed (contracted) in a direction away from the rotation axis of the cover 10 due to contraction of the opening size of the slit 223 by receiving pressure from the side portion of the projection 112. Thereby, the cover 10 can be rotated while pushing the stopper 222 away by the protrusion 112, and the rotation to the specific opening angle γ is allowed. When the surface 113 of the projection 112 of the cover 10 is engaged with the stopper 222, the elastic deformation (contraction) of the case side wall 20d is restored to the original state, and the cover 10 is stopped at the opening angle γ by the restoring force. It is locked by.

  Therefore, for example, a maintenance person or the like can efficiently perform the work on the inside of the case 20 (for example, confirmation of measured values displayed on the display, various settings through the setting panel, etc.) with the cover 10 held at the opening angle γ. Can be implemented. Further, in the situation where the housing assembly 1 is installed in an environment where the cover 10 cannot be opened larger than the opening angle γ due to the presence of an obstacle such as a wiring cable, the cover 10 is thus opened at the opening angle γ. It is extremely useful to be able to work in a locked state.

  The locked state at the opening angle γ of the cover 10 can be easily released by applying a force larger than the weight of the cover 10 to the cover 10. The locking force at the opening angle γ of the cover 10 can be easily adjusted by, for example, adjusting the size of the slit 223 described above.

  DESCRIPTION OF SYMBOLS 1 ... Housing assembly, 10 ... Cover, 10a ... Cover surface, 10b, 10c, 10e ... Cover side part, 10d ... Cover side part (flange part), 10f ... Cover back surface, 11a, 11b ... Shaft member (cover shaft), DESCRIPTION OF SYMBOLS 12, 211 ... Projection part, 20 ... Case, 20b, 20c, 20d, 20e ... Side wall, 20f ... Bottom part, 21a, 21b ... Bearing part (case bearing part), 110 ... Notch part (slit), 111 ... Chamfer part 112 ... Projection part, 113, 114 ... surface, 200 ... Opening part, 210 ... Inclined surface, 212 ... Corner part, 213 ... Depression part (guide part), 215 ... Step part, 222 ... Stopper, 223 ... Slit, 300 ... Gap

Claims (10)

A housing assembly hinge structure comprising: a case having an opening; and a cover that covers the opening and is rotatably attached to one end of the opening;
A pair of shaft members forming both ends of the rotation shaft of the cover;
A pair of bearing portions provided in the case, each of which is fitted with the shaft member and rotatably supports the shaft member;
Only in one of the shaft members, the cover surface that closes the opening in the closed position of the cover is in the direction that faces, and the portion that contacts the corresponding inner peripheral surface of the bearing portion in the fully opened position of the cover. A hinge structure with chamfered parts.   The case includes a guide portion that extends in a direction in which the chamfered portion faces in a fully open position of the cover from the bearing portion into which the shaft member is fitted, and guides the shaft member off the bearing portion. Item 2. The hinge structure according to Item 1.   The hinge structure according to claim 1, wherein the case further includes a protrusion that contacts the surface of the cover in the fully open position of the cover.   The hinge structure according to any one of claims 1 to 3, wherein the cover includes a notch portion that opens toward a direction in which the cover surface that closes the opening portion faces in the closed position.   4. The hinge structure according to claim 3, wherein the protrusion is provided at a position corresponding to the center of the width of the rotation shaft in the length direction of the cover or the vicinity thereof.   5. The hinge structure according to claim 4, wherein the notch is provided at a position corresponding to a center of the width in the length direction of the rotation shaft of the cover or a vicinity thereof.   The hinge structure according to any one of claims 1 to 6, further comprising a locking structure that holds the cover at a specific opening angle with respect to the case. The locking structure is
A protrusion that is provided on the cover and protrudes in a direction in which the cover surface that closes the opening in the closed position faces;
The hinge structure according to claim 6, further comprising: a locking portion that is provided on the case and engages with the protrusion of the cover at a position locked at the opening angle to lock the cover. .   The case is elastically deformed in a direction away from the rotation shaft according to a pressure received from the protrusion while the locking portion engages with the protrusion while the cover is rotated to the open angle. The hinge structure according to claim 8, further comprising:   The hinge structure according to claim 9, wherein the elastically deforming portion includes a slit whose opening size is deformed in a direction away from the rotation shaft according to the pressure.

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