Engagement structure of open part and lid body of housing body

Abstract

To achieve a secure of a volume of an open part of a housing body and a sure cancellation of a lid body.SOLUTION: A function calculator 1 comprises: an operation part (first region) 222 that has an engagement part (engagement region) 222b and a finger hook part (finger hook region) 222a of a lid member (lid body) 20 that is engaged to an engaged part (engaged region) 12 of a housing body 10 having an open part 11 in order to cover the open part 11; and a hook (elastic member) 22 that includes a base part (second region) 221 that is provided at a position opposite to the operation part 222 so as to be integrally formed to the lid member 20. When an engaged part 12 is engaged to the engagement part 222b, the finger hook part 222a is moved to a direction where the operation part 222 and the base part 221 are approached, and thus, an engagement structure of the open part 11 and the lid member 20 that the engaged part 12 and the engagement part 222b are separated is provided. In a region (corner part C1 of the operation part 222) that is opposite to at least any one of the operation part 222 and the base part 221, a shape of which a corner is removed is formed.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to an engagement structure between an opening of a housing and a lid body.

Background Art

[0002] Conventionally, in a battery-driven electronic device, a structure is adopted in which an opening of a storage portion for storing a battery in a housing is detachably covered with a lid body. For example, in Patent Document 1, an engagement protrusion that engages with an opening of a housing is formed at one end of a lid body that covers a battery storage portion, and a U-shaped elastic piece (leaf spring), a dike for engagement of the opening, and a concave groove are formed at the other end, respectively, and it is disclosed that the dike and the concave groove are detachably engaged with the opening of the housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When securing the volume of the battery storage portion, it is necessary to make the region having the elastic piece as compact as possible. However, if the region having the elastic piece is made compact, the movement range of the finger hook portion for deforming the elastic piece when removing the battery lid becomes narrow, and it is expected that it will be difficult to release the engagement even if it is moved sufficiently.

[0005] An object of the present invention is to achieve both securing the volume of the opening of the housing and reliably releasing the lid body.

Means for Solving the Problems

[0006] In order to solve the above problems, the engaging structure between the opening and the lid body according to the present invention includes a first region having an engaging region and a pointing region of the lid body that engages with an engaged region of a housing having an opening to cover the opening, and an elastic member integrally formed on the lid body and provided at a position facing the first region. When the engaged region and the engaging region are engaged, the engaging structure between the opening and the lid body is such that the pointing region is moved in a direction in which the first region and the second region approach each other, so that the engaged region and the engaging region are separated. The opposing regions in at least one of the first region and the second region are formed in a chamfered shape.

Advantages of the Invention

[0007] According to the present invention, it is possible to achieve both ensuring the volume of the opening of the housing and reliably releasing the lid body.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the engagement structure between the opening and the lid body according to the present invention will be described with reference to the drawings. Note that, as an example of an electronic device to which the present invention is applied, a scientific calculator will be described. However, the electronic device is not limited to a scientific calculator, and any electronic device (for example, an electronic dictionary, a tablet terminal, etc.) that includes a lid member 20 that closes the opening 11 of the housing 10 described later can be applied.

[0010] As shown in FIGS. 1 and 2, the scientific calculator 1 includes a housing 10 and a lid member (lid body) 20. The housing 10 is provided with an opening 11 that opens at the back and houses (loads) four dry batteries (not shown) or a dry battery type secondary battery (not shown) (see FIGS. 5 and 8).

[0011] The opening 11 is formed in a circular shape whose mouth corresponds to the outer shape (circular shape) of the lid member 20 (see FIG. 3), and is covered by attaching the lid member 20.

[0012] As shown in FIGS. 1 and 5, at a predetermined position of the opening 11 (a position corresponding to a hook 22 (described later) of the lid member 20), an engaged portion (engaged region) 12 for engaging the hook 22 when the lid member 20 is attached is provided.

[0013] The engaged portion 12 is formed in a eaves-like shape that protrudes while sloping downward from the periphery of the opening 11 toward the center of the opening 11. As shown in FIG. 7, the engaged portion 12 has an engaged surface 121 that engages with an engaging surface 222c1 of each rib 222c (described later) provided on the hook 22. Further, the engaged portion 12 has an inclined surface (first surface) 122 adjacent to the engaged surface 121. When the engaging surface 222c1 of each rib 222c (described later) engages with the engaged surface 121, that is, when the lid member 20 is attached to the housing 10, the inclined surface 122 faces the inclined surface (second surface) 222c2 of each rib 222c and is formed so as to be separated from the inclined surface 222c2 by a predetermined distance. This predetermined distance is set to a distance that can prevent rattling caused by an impact being applied to the lid member 20 or the housing 10. Thereby, when an impact is applied to the lid member 20 or the housing 10, the rattling caused by the impact can be preferably prevented.

[0014] Also, at a predetermined position of the opening 11 (the position corresponding to the locking piece 23 (described later) of the lid member 20), a locking hole (not shown) for locking (inserting) the locking piece 23 when the lid member 20 is attached is provided.

[0015] As shown in FIG. 3, the lid member 20 includes a lid main body portion 21, a hook (elastic member) 22, and a locking piece 23.

[0016] The lid main body portion 21 is a portion that closes the opening 11 of the housing 10, and is formed in a circular shape (disk shape) corresponding to the opening 11 having a circular width. The lid main body portion 21 has a portion corresponding to the engaged portion 12 provided on the housing 10 cut out, and a hook 22 is provided at the inner end 21a of the portion.

[0017] The hook 22 is a hook that engages the housing 10 and the lid member 20. Specifically, as shown in FIGS. 3 and 6(a), the hook 22 includes a base portion (second region) 221 that protrudes from the back surface side of the above-described end portion 21a of the lid main body portion 21, an operation portion (first region) 222 disposed opposite to the base portion 221, and a connecting portion 223 that connects the base portion 221 and the operation portion 222 to each other, and is a leaf spring-shaped hook. Here, when the lid member 20 is attached to the housing 10, the hook 22 is in a state of being biased toward the engaged portion 12. Note that the hook 22 only needs to be biased toward the engaged portion 12 when the lid member 20 is attached to the housing 10, and is not limited to a leaf spring shape, and may be a hook using other biasing means such as a coil spring or rubber.

[0018] The operation portion 222 is provided with a finger placing portion (finger placing region) 222a that is operated in a direction (the direction from top to bottom in FIG. 1) to loosen the engagement between the housing 10 and the lid member 20 when removing the lid member 20 from the housing 10.

[0019] The finger placing portion 222a is formed in a hook shape at the free end side opposite to the one end side connected to the connecting portion 223 of the operation portion 222. As shown in FIG. 3, the finger placing portion 222a is formed in a curved shape that is recessed in a direction (the direction from top to bottom in FIG. 1) to loosen the engagement between the housing 10 and the lid member 20. That is, the finger placing portion 222a is formed in a shape that is recessed in a direction opposite to the arc-shaped recess at the location corresponding to the finger placing portion 222a of the opening 11 (the location where the engaged portion 12 is provided). Further, the finger placing portion 222a is formed so as not to protrude from the outer surface of the housing 10, that is, not to bulge, when the lid member 20 is attached to the housing 10. Further, as shown in FIG. 6(a), the finger placing portion 222a has a corner C1 bent in a hook shape formed in an R shape (as if the corner is rounded).

[0020] Further, the operation unit 222 is provided with an engaging portion (engaging region) 222b between one end side connected to the connecting portion 223 and the other end side provided with the pointing portion 222a. The engaging portion 222b is a portion that engages with the engaged portion 12 provided on the housing 10. As shown in FIGS. 5 and 6(a), the upper surface of the engaging portion 222b is formed to be downwardly inclined toward the engaged portion 12 side. Further, ribs 222c, 222c are provided on the upper surface of the engaging portion 222b.

[0021] As shown in FIG. 4, two ribs 222c are provided at a predetermined interval in the width direction of the engaging portion 222b. As shown in FIGS. 4 and 7, each rib 222c has an engaging surface 222c1 and an inclined surface 222c2 adjacent to the lower end of the engaging surface 222c1.

[0022] The engaging surface 222c1 is a surface that engages with the engaged surface 121 of the engaged portion 12 provided on the housing 10. When the engaging surface 222c1 engages with the engaged surface 121, that is, when the lid member 20 is attached to the housing 10, the operation unit 222 is in a state of being pushed toward the base portion 221 by the engaged portion 12. That is, when the lid member 20 is attached to the housing 10, the operation unit 222 (hook 22) is in a state of being biased toward the engaged portion 12 side. Here, when the engaging surface 222c1 of the rib 222c engages with the engaged surface 121 of the engaged portion 12, it prevents rattling and functions as a positioning rib in the height direction (thickness direction of the housing 10) of the lid member 20.

[0023] The inclined surface 222c2 is downwardly inclined toward the engaged portion 12 side as shown in FIG. 7. The inclined surface 222c2 faces the inclined surface 122 of the engaged portion 12 and is formed to be separated from the inclined surface 122 by a predetermined distance when the engaging surface 222c1 engages with the engaged surface 121, that is, when the lid member 20 is attached to the housing 10.

[0024] The connecting portion 223 is a portion that connects the base portion 221 and the operating portion 222 to each other as described above. The connecting portion 223 has a U-shaped cross-section in a side view as shown in FIG. 6(a). Therefore, the operating portion 222 including the engaging portion 222b described above is rotatable in a direction away from the engaged portion 12 (a direction approaching the base portion 221) or a direction approaching the engaged portion 12 (a direction away from the base portion 221) about the lowermost end position of the connecting portion 223 (with the width direction of the connecting portion 223 as the axis). In the present embodiment, the hook 22 is formed in a curved shape that is recessed in a direction to loosen the engagement between the housing 10 and the lid member 20 for any of the base portion 221, the operating portion 222, the engaging portion 222b, and the connecting portion 223 in correspondence with the curved shape of the finger placing portion 222a (see FIG. 3). For this reason, when the finger placing portion 222a is moved in a direction to loosen the engagement between the housing 10 and the lid member 20 when removing the lid member 20 from the housing 10, stress is likely to concentrate on both ends in the width direction of the connecting portion 223. Therefore, as shown in FIG. 4, chamfered portions 223a are provided at both ends in the width direction of the connecting portion 223, that is, the material is removed at both ends. Thereby, the concentration of stress applied to both ends in the width direction of the connecting portion 223 is reduced.

[0025] The base portion 221 protrudes from the back side of the inner end portion 21a of the lid main body portion 21 as described above. As shown in FIGS. 5 and 6(a), the base portion 221 is provided with a chamfered portion 221a at an L-shaped corner C2 formed by the base portion 221 and the lid main body portion 21. This chamfered portion 221a is provided at an angle (relief angle) corresponding to the inclination angle of the operation portion 222 when the corner C1 of the finger placing portion 222a abuts at a position where the finger placing portion 222a abuts when the finger placing portion 222a is operated in a direction to loosen the engagement between the housing 10 and the lid member 20. In other words, in a region (corner C2) facing the corner C1 of the finger placing portion 222a (operation portion 222) of the base portion 221, as a result of moving the finger placing portion 222a in a direction in which the operation portion 222 and the base portion 221 approach each other, a shape (relief shape; chamfered portion 221a) with an angle when the operation portion 222 and the base portion 221 come into contact (abut) is formed as a relief angle. FIG. 6(b) shows a state in which the finger placing portion 222a is moved in a direction in which the operation portion 222 and the base portion 221 approach each other from FIG. 6(a), and the chamfered portion 221a corresponds to the position and angle (tilt angle) where the operation portion abuts. In the present embodiment, since the corner C1 of the finger placing portion 222a is formed in an R shape and the base portion 221 is provided with the chamfered portion 221a, the stroke amount (movement amount) of the finger placing portion 222a can be increased even when it is difficult to secure a movement distance. As a result, when the finger placing portion 222a is operated in a direction to loosen the engagement between the housing 10 and the lid member 20, the engagement can be reliably released. Note that the R shape may be formed at the corner C2, and in that case, the chamfered portion 221a may be provided on the operation portion 222 side.

[0026] The locking piece 23 engages with a locking hole (not shown) provided in the opening 11 by being inserted therein. The locking pieces 23 are provided at two locations on the peripheral edge of the lid main body portion 21. Specifically, the locking pieces 23, 23 are located at the respective vertex positions of an isosceles triangle having the above-described hook 22 as a vertex and are provided on the peripheral edge of the lid main body portion 21.

[0027] The lid member 20 is configured to be supported by the above-described hooks 22 and the two locking pieces 23, 23. The hooks 22 and the locking pieces 23, 23 are both integrally formed with the lid main body 21.

[0028] In the above-described structure, when a dry battery or a dry battery type secondary battery is stored at a predetermined position in the opening 11, the locking pieces 23, 23 of the lid member 20 are inserted into locking holes (not shown) in the opening 11, and in the state shown in FIG. 8, when the lid member 20 is pressed from above, the lid main body 21 of the lid member 20 fits into the opening 11, the hook 22 of the lid member 20 bends inward and engages with the engaged portion 12, and the lid member 20 is fixed to the housing 10 (see FIG. 5). On the other hand, in this state, when the finger-touching portion 222a of the hook 22 is operated in the direction of loosening the engagement between the housing 10 and the lid member 20 (toward the base portion 221), the engagement between the hook 22 and the engaged portion 12 is released, and the opening 11 is opened (see FIG. 8). At this time, since the inclined surfaces 222c2 are provided on the respective ribs 222c (see FIG. 7), the corner formed by the engaged surface 121 of the engaged portion 12 and the inclined surface 122 does not interfere (contact) with the engaging portion 222b (hook 22). Therefore, the operation of releasing the engagement between the housing 10 and the lid member 20 can be performed smoothly.

[0029] As described above, the scientific calculator 1 of the present embodiment includes an operating portion (first region) 222 having an engaging portion (engaging region) 222b and a finger-touching portion (finger-touching region) 222a that engage with an engaged portion (engaged region) 12 of a housing 10 having an opening 11 to cover the opening 11, and a hook (elastic member) 22 having a base portion (second region) 221 integrally formed with the lid member 20 and provided at a position facing the operating portion 222. When the engaged portion 12 and the engaging portion 222b are engaged, by moving the finger-touching portion 222a in the direction in which the operating portion 222 and the base portion 221 approach each other, it has an engagement structure between the opening 11 and the lid member 20 in which the engaged portion 12 and the engaging portion 222b are separated, and the opposing region (corner C1 of the operating portion 222) in at least one of the operating portion 222 and the base portion 221 has a rounded shape.

[0030] Therefore, according to the scientific calculator 1, since the opposing area (corner C1 of the operation unit 222) in at least one of the operation unit 222 and the base unit 221 of the lid member 20 is formed in a rounded shape, when the pointing part 222a is operated in a direction to loosen the engagement between the housing 10 and the lid member 20, it is possible to prevent the corner C1 of the operation unit 222 from contacting (abutting) the corner C2 of the base unit 221. As a result, the stroke amount (movement amount) of the pointing part 222a can be increased, so that when the pointing part 222a is operated in a direction to loosen the engagement between the housing 10 and the lid member 20, the engagement can be reliably released. Also, since the stroke amount of the pointing part 222a can be increased, there is no need to expand the area where the hook 22 of the opening 11 is disposed, and it is possible to easily secure the volume (battery storage space) in the opening 11 of the housing 10.

[0031] Further, in the lid member 20 of the scientific calculator 1, in the area (corner C2) opposing the corner C1 of the pointing part 222a (operation unit 222) of the base unit 221, as a result of moving the pointing part 222a in a direction in which the operation unit 222 and the base unit 221 approach each other, a shape (relief shape; chamfered part 221a) with an angle when the operation unit 222 and the base unit 221 come into contact (abut) is defined as a relief angle, so that it is possible to further prevent the corner C1 of the operation unit 222 from contacting (abutting) the corner C2 of the base unit 221.

[0032] As described above, the present invention has been specifically described based on the embodiments, but the present invention is not limited to the above embodiments and can be modified without departing from the gist thereof. For example, in the above embodiment, the opening 11 of the housing 10 is formed in a circular shape, but the shape of the opening 11 is not limited to a circular shape. The shape of the opening 11 may be, for example, a rectangle, an ellipse, or the like. When the shape of the opening 11 is a rectangle, the lid main body 21 has a shape corresponding to the opening 11 formed in the rectangle.

[0033] In addition, in the above-described embodiment, the corner C1 of the pointing portion 222a is formed in an R shape, and the chamfered portion 221a is provided on the base portion 221. However, for example, if the corner C1 of the pointing portion 222a is formed in an R shape, the chamfered portion 221a may not be provided on the base portion 221. Further, if the chamfered portion 221a is provided on the base portion 221, the corner C1 of the pointing portion 222a may not be formed in an R shape.

[0034] In addition, in the above-described embodiment, the locking piece 23 of the lid member 20 is configured to lock into a locking hole (not shown) provided at a predetermined position of the opening 11. However, for example, the lid member 20 and the housing 10 may be coupled via a hinge that enables the opening and closing operation of the opening 11. In this case, the lid member 20 has a structure that does not completely come off from the housing 10.

[0035] In addition, in the above-described embodiment, the shape of the curved surface of the inclined surface 222c2 may be made to coincide with the shape of the movement locus of the inclined surface 222c2 when the engaging portion 222b of the lid member 10 is rotated. By doing so, when an impact is applied to the lid member 20 or the housing 10, it is possible to prevent the lid member 20 from moving upward and being removed from the housing 20, while appropriately releasing the engagement between the housing 20 and the lid member 10.

[0036] In addition, regarding the detailed configuration of each component of the scientific calculator 1 in the above-described embodiment, it goes without saying that it can be appropriately changed without departing from the spirit of the present invention.

Explanation of Reference Numerals

[0037] 1 Scientific calculator, 10 Housing, 11 Opening, 12 Engaged portion, 121 Engaged surface, 122 Inclined surface, 20 Lid member, 21 Lid main body portion, 22 Hook, 221 Base portion, 221a Chamfered portion, 222 Operation portion, 222a Pointing portion, 222b Engaging portion, 222c Rib, 222c1 Engaging surface, 222c2 Inclined surface, 223 Connecting portion, 223a Chamfered portion, 23 Locking piece

Claims

1. A first region having an engagement region and a pointing region of a lid body that engages with an engaged region of a housing having an opening and covers the opening, and an elastic member integrally formed with the lid body and provided at a position facing the first region. When the engaged region and the engagement region are engaged, the pointing region is moved in a direction in which the first region and the second region approach each other, thereby forming an engagement structure between the opening and the lid body where the engaged region and the engagement region are separated, An engagement structure characterized in that a cornered shape is formed in at least one of the opposing regions of the first region and the second region.

2. In a region opposite to the region where the cornered shape is formed in the opposing region, as a result of moving the pointing region in a direction in which the first region and the second region approach each other, when the first region and the second region come into contact, a shape having an escape angle as the angle is formed. The engagement structure according to claim 1, characterized in that

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