Patent Description:
The present disclosure relates to electronic devices and, more particularly, to an electronic device comprising a waterproof lid structure which is structurally simple and highly durable.

Some electronic devices, such as laptops and workstations, come with waterproof lids mounted on openings of receiving chambers for receiving batteries. The receiving chambers are hermetically sealed with soft waterproof elements of the waterproof lids, so as to preclude intrusion of moisture or dust into the receiving chambers. It is because the intrusion of moisture or dust is likely to cause a battery failure or a shortened service life. Furthermore, the waterproof lid is pivotally connected to one side of the opening, and the waterproof lid is fixed to the opening by snap-engagement when shut, so as to prevent the waterproof lid from breaking off when opened or from detaching when shaken or hit. A protective housing including a housing and a rotating cover mechanism is known from the <CIT>. In this protective housing, an opening and a restriction groove are defined in the housing, and the cover mechanism includes a cover body and a latching member rotatably mounted on the cover body. The cover body includes an outer cover and a sup- porting plate detachably coupled thereto. The latching member includes a handle, a latch between the outer cover and the supporting plate and coupled to the handle, and a mechanical button adjacent to the latch. The latch includes a positioning groove. The partly exposed mechanical button is located between the outer cover and the supporting plate. The handle causes the latch to be received in the restriction groove and the mechanical button is received in the positioning groove to lock the latch.

However, owing to technological advancement, the axles (for pivotal connection) and snap-engagement components (for snap-engagement) of the conventional waterproof lids are made of plastic and manufactured by injection molding with a view to rendering the electronic devices lightweight and easy to manufacture, at the expense of durability. Low durability results from resilience fatigue and deformation after long use. Moreover, regarding a conventional waterproof lid, not only are a waterproof element and a casing have to be fixed to each other, but the casing also has to be snap-engaged with the opening, thereby adding to the complexity of the entire framework and causing a plethora of parts and components. Therefore, it is important to increase the structural strength of the waterproof lid to enhance durability, and simplify the structure of the waterproof lid, with a view to rendering the parts and components easy to manufacture and cutting cost.

In view of this, the inventor of the present disclosure aims to improve the prior art by overcoming the aforesaid drawbacks of the prior art.

It is an objective of the present disclosure to simplify a waterproof lid structure of an electronic device and increase its mechanical strength to thereby enhance its durability and its waterproofing and dustproofing efficiency.

In order to achieve the above and other objectives, the present disclosure provides an electronic device comprising a casing and a waterproof lid structure with the features of claims <NUM> and <NUM>. The casing has an opening. The waterproof lid structure corresponds in position to the opening. The waterproof lid structure comprises a supportive sheet metal, a waterproof component, a movable latch lid and a plurality of bolts. The supportive sheet metal has an axle. The axle is pivotally connected to one side of the opening. The waterproof component is adapted to hermetically seal the opening and is disposed on one side of the supportive sheet metal. The movable latch lid covers the other side of the supportive sheet metal and is penetrated by a plurality of passages. The bolts correspond in position to the passages, respectively. The bolts each comprise a rod portion and a head portion disposed at one end of the rod portion. The rod portions pass through the passages and supportive sheet metal, respectively. The other ends of the rod portions are fastened to the waterproof component. The head portions stop at the outer side of the movable latch lid.

In order to achieve the above and other objectives, the present disclosure further provides a method of assembling an electronic device with the features of claim <NUM>. The method comprises the steps of: providing a casing, a supportive sheet metal, a waterproof component, a movable latch lid and a plurality of bolts, the casing having an opening, the supportive sheet metal having an axle, the movable latch lid being penetrated by a plurality of passages, the bolts corresponding in position to the passages, respectively, the bolts each comprising a rod portion and a head portion disposed at one end of the rod portion; positioning the waterproof component on a side of the supportive sheet metal and covering another side of the supportive sheet metal with the movable latch lid; passing the rod portions of the bolts from an outer side of the movable latch lid through the passages, respectively, and through the supportive sheet metal before being fastened to the waterproof component, thereby allowing the head portion to stop at the outer side of the movable latch lid; and connecting pivotally the axle of the supportive sheet metal to a side of the opening, wherein the waterproof component covers and hermetically seals the opening.

In order to achieve the above and other objectives, the present disclosure further provides an electronic device comprising a casing and a waterproof lid structure. The casing has an opening. The waterproof lid structure corresponds in position to the opening. The waterproof lid structure comprises a base, a waterproof component, a movable latch lid and a coupling element. The base is penetrated by a through hole and pivotally disposed on a side of the opening. The waterproof component is disposed on a side of the base to hermetically seal the opening. The movable latch lid is penetrated by a passage and disposed on another side of the base. The coupling element comprises a rod portion and a head portion disposed at one end of the rod portion. The rod portion passes through the passage and then passes through the through hole. The head portion stops at an outer side of the passage. The other end of the rod portion is fixed to the waterproof component, and the movable latch lid slides along the rod portion through the passage.

In order to achieve the above and other objectives, the present disclosure further provides a method of assembling an electronic device. The method comprises the steps of: providing a casing, a base, a waterproof component, a movable latch lid and a coupling element, the casing having an opening, the base being penetrated by a through hole, the movable latch lid being penetrated by a passage, and the coupling element comprising a rod portion and a head portion disposed at one end of the rod portion; positioning the waterproof component on a side of the base and positioning the movable latch lid on another side of the base; passing the rod portion through the passage and then through the through hole, allowing the head portion to stop at an outer side of the passage, allowing the other end of the rod portion to be fixed to the waterproof component, allowing the movable latch lid to slide along the rod portion through the passage; and connecting pivotally the base to a side of the opening.

The present disclosure further has advantages described below. With the positioning posts being penetratingly disposed at the through holes, not only are the supportive sheet metal and the waterproof component positioned by each other, they are also fastened together by the bolts to fix the movable latch lid and the waterproof component to each other. The length of extension of the passage places limitations on the displacement of the movable latch lid. By moving the movable latch lid, it is feasible for the latch portion to be latched into or removed from a fastening groove, such that the waterproof lid structure gets fastened or released. Furthermore, with the resilient hook being engagingly fitted to the left and right sides of the dowel, users can confirm whether the movable latch lid has been moved to a fastening position or a release position.

The technical features of the present disclosure are depicted by accompanying drawings and described below. However, the accompanying drawings are illustrative rather than restrictive of the present disclosure.

The present disclosure provides an electronic device. Referring to <FIG> and <FIG>, the electronic device essentially comprises a casing <NUM> and a waterproof lid structure <NUM>.

In this embodiment, the casing <NUM> is made of aluminum or plastic, but the present disclosure is not limited thereto. The casing <NUM> has a chamber 100A for receiving a battery (not shown). The casing <NUM> has an opening <NUM> in communication with the chamber 100A. In this embodiment, the opening <NUM> is oblong. The accompanying drawings show the opening <NUM> and its surroundings rather than the whole of the casing <NUM> for the sake of illustration, and the other parts of the casing <NUM> are not restrictive of the present disclosure.

The waterproof lid structure <NUM> corresponds in position to the opening <NUM> and looks like a door substantially. The waterproof lid structure <NUM> essentially comprises a supportive sheet metal <NUM>, a waterproof component <NUM>, a movable latch lid <NUM> and a plurality of bolts <NUM>.

The supportive sheet metal <NUM> corresponds in shape to the opening <NUM> and thus is an oblong sheet metal plate made of stainless steel, but the present disclosure is not limited thereto. For example, the supportive sheet metal <NUM> may also be provided in the form of any other metal plate of high mechanical strength. The supportive sheet metal <NUM> has an axle 211A. The axle 211A is pivotally connected to one side of the opening <NUM>. The supportive sheet metal <NUM> is penetrated by a plurality of through holes 211B. The through holes 211B are equidistantly disposed along the longitudinal direction of the supportive sheet metal <NUM>. In this embodiment, the axle 211A of the supportive sheet metal <NUM> is further connected to two securing sheet metals <NUM>. The securing sheet metals <NUM> are fixed to one side of the opening <NUM> through two screwing elements A to allow the supportive sheet metal <NUM> to turn over relative to the securing sheet metals <NUM> through the axle 211A.

The waterproof component <NUM> corresponds in shape to the supportive sheet metal <NUM> and thus is oblong. In this embodiment, the waterproof component <NUM> comprises a joint portion <NUM> and a seal portion <NUM> which are connected. The joint portion <NUM> is made of hard plastic, whereas the seal portion <NUM> is made of soft plastic (for example, silica gel or rubber), and both are coupled together by bi-injection to manufacture the waterproof component <NUM>. The joint portion <NUM> is disposed on one side of the supportive sheet metal <NUM> and corresponds in position to the opening <NUM>. The seal portion <NUM> hermetically seals the opening <NUM>. Therefore, the soft seal portion <NUM> hermetically seals the opening <NUM> effectively by resilient deformation to thereby attain a minimum waterproof and dustproof rating of IP66. The tolerance of the joint portion <NUM> made of plastic is effectively controlled during a production process to enable the joint portion <NUM> to snap-engage with the supportive sheet metal <NUM>. A plurality of positioning posts 221A are protrudingly disposed at the joint portion <NUM> of the waterproof component <NUM> and correspond in position to the through holes 211B of the supportive sheet metal <NUM>, respectively. The positioning posts 221A pass through the through holes 211B, respectively. Therefore, the supportive sheet metal <NUM> and the waterproof component <NUM> position each other.

The movable latch lid <NUM> corresponds in shape to the supportive sheet metal <NUM> and thus is oblong. In this embodiment, the movable latch lid <NUM> is made of plastic to reduce the weight of the waterproof lid, but the present disclosure is not limited thereto. The movable latch lid <NUM> covers the other side of the supportive sheet metal <NUM> to thereby face away from the waterproof component <NUM>. The upper and lower sides of the movable latch lid <NUM> each extend to form a shield 230A. The shields 230A shield and enclose the top edge and bottom edge of the waterproof component <NUM> and the supportive sheet metal <NUM>, respectively. The movable latch lid <NUM> is penetrated by a plurality of passages <NUM> corresponding in position to the through holes 211B and the positioning posts 221A, respectively. In this embodiment, the passages <NUM> are counterbores, whereas the passages <NUM> extend in a direction parallel to the axle 211A, allowing the positioning posts 221A to abut against the passages <NUM> after passing through the through holes 211B, respectively.

The bolts <NUM> correspond in position to the passages <NUM> and the positioning posts 221A, respectively. The bolts <NUM> each comprise a rod portion 241A and a head portion 241B disposed at one end of the rod portion 241A. The other ends of the rod portions 241A pass through the passages <NUM> and the supportive sheet metal <NUM> so as to be fastened and fixed to the positioning posts 221A of the waterproof component <NUM>, respectively. The head portions 241B stop at the outer side of the movable latch lid <NUM>. Therefore, the waterproof component <NUM> and the movable latch lid <NUM> can be fixed together, and the movable latch lid <NUM> can move leftward and rightward relative to the supportive sheet metal <NUM>, allowing the displacement of the movable latch lid <NUM> to be limited by the length of extension of the passages <NUM>.

A handle <NUM> is protrudingly disposed on the outer side of the movable latch lid <NUM> and disposed between any two adjacent ones of the passages <NUM>. In this embodiment, the handle <NUM> is slender and perpendicular to the direction of extension of the movable latch lid <NUM>, such that users can easily push the handle <NUM> to trigger the leftward and rightward movement of the movable latch lid <NUM>. Furthermore, at least a latch portion <NUM> is protrudingly disposed on the shield 230A lying above the movable latch lid <NUM>. The opening <NUM> of the casing <NUM> has at least a fastening groove <NUM> corresponding in position to the latch portion <NUM>. In this embodiment, both the latch portion <NUM> and the fastening groove <NUM> are in the number of three, whereas the latch portions <NUM> are each a bump, and the fastening grooves <NUM> each have a slot, but the present disclosure is not limited thereto.

Referring to <FIG> and <FIG>, when users push the handle <NUM>, the movable latch lid <NUM> moves along the direction of extension of the passages <NUM> to reach a fastening position, such that the latch portions <NUM> in the form of bumps are latched into the fastening grooves <NUM>, so as to fix the waterproof lid structure <NUM> in place and prevent it from opening. Referring to <FIG> and <FIG>, to open the waterproof lid structure <NUM>, users push the handle <NUM> reversely, such that the movable latch lid <NUM> moves to an unlocked position, triggering the separation of the latch portions <NUM> from the slots of the fastening grooves <NUM>. Therefore, the latch portions <NUM> and the fastening grooves <NUM> address the durability issue better than hook-based engagement in terms of the fixation of the waterproof lid structure <NUM>. In addition, the waterproof lid structure <NUM> has the supportive sheet metal <NUM> and thus is structurally stronger than its conventional counterparts which are entirely made of plastic, and the waterproof lid structure <NUM> is not predisposed to damage and deformation even after long use.

In this embodiment, the bolts <NUM>, the through holes 211B and the positioning posts 221A are each in the number of three, but the present disclosure is not limited thereto. For example, the bolts <NUM>, the through holes 211B and the positioning posts 221A may each be in the number of two or four. The supportive sheet metal <NUM> further has a slot 211C. In this embodiment, the slot 211C lies above the middle one of the through holes 211B. A dowel 221B corresponding in position to the slot 211C is protrudingly disposed at the joint portion <NUM> of the waterproof component <NUM>. The dowel 221B is penetratingly disposed at the slot 211C. A resilient hook <NUM> corresponding in position to the dowel 221B is disposed at the movable latch lid <NUM>. The resilient hook <NUM> is engagingly fitted to the dowel 221B upon the axial movement of the movable latch lid <NUM>. Referring to <FIG> and <FIG>, users confirm whether the movable latch lid <NUM> has moved to a fastening position or a release position by observing variations in engagingly fitting the resilient hook <NUM> to the left and right sides of the dowel 221B.

Referring to <FIG>, preferably, the waterproof lid structure <NUM> of the present disclosure further comprises a magnet <NUM> and a decorative plate <NUM>. The joint portion <NUM> of the waterproof component <NUM> has a receiving chamber 221C. The supportive sheet metal <NUM> is penetrated by a magnet through-hole 211D. The magnet <NUM> is received in the receiving chamber 221C and penetrates the magnet through-hole 211D so as to be clamped by the movable latch lid <NUM>. Therefore, the magnet <NUM> works along with a detector (not shown) disposed in the opening <NUM> to detect whether the waterproof lid structure <NUM> is opened or shut. The decorative plate <NUM> is a slender plastic plate penetrated by a handle through-hole <NUM>. The decorative plate <NUM> is engagingly disposed on the outer side of the movable latch lid <NUM>. The handle <NUM> is protruded from the handle through-hole <NUM> and exposed from the decorative plate <NUM>. Therefore, the decorative plate <NUM> conceals the passages <NUM>, bolts <NUM> and resilient hook <NUM> to ensure the neat, visually pleasing appearance of the waterproof lid structure <NUM>. Moreover, the handle <NUM> protruding from the handle through-hole <NUM> is easy to push by users.

The present disclosure further provides a method of assembling an electronic device, as described below. The positioning posts 221A of the waterproof component <NUM> pass through the through holes 211B on the supportive sheet metal <NUM>, respectively, such that the waterproof component <NUM> is disposed on one side of the supportive sheet metal <NUM>. Then, the movable latch lid <NUM> covers the other side of the supportive sheet metal <NUM>, such that the positioning posts 221A abuttingly fit to the passages <NUM> on the movable latch lid <NUM>, respectively. Next, the rod portions 241A of the bolts <NUM> pass from the outer side of the movable latch lid <NUM> through the passages <NUM>, respectively, and pass through the supportive sheet metal <NUM> before being fastened and fixed to the positioning posts 221A of the waterproof component <NUM>, respectively, thereby allowing the head portion 241B to stop at the outer side of the movable latch lid <NUM> and fixing the movable latch lid <NUM> to the waterproof component <NUM>. After that, the axle 211A of the supportive sheet metal <NUM> is pivotally connected to one side of the opening <NUM>, and the waterproof lid structure <NUM> is shut to cause the seal portion <NUM> of the waterproof component <NUM> to cover and hermetically seal the opening <NUM>. Finally, users push the handle <NUM> to drive the movable latch lid <NUM> to move to the fastening position and cause the resilient hook <NUM> to engagingly fit to the right side of the dowel 221B, thereby allowing the latch portions <NUM> to be latched into the fastening grooves <NUM> to fasten the movable latch lid <NUM> in place.

The present disclosure further provides an electronic device. Referring to <FIG> and <FIG>, the electronic device essentially comprises a casing <NUM> and a waterproof lid structure <NUM>.

In this embodiment, the casing <NUM> is made of aluminum or plastic, but the present disclosure is not limited thereto. The casing <NUM> has a chamber 100A for receiving a battery (not shown) and has an opening <NUM> in communication with the chamber 100A. In this embodiment, the opening <NUM> is oblong. The accompanying drawings show the opening <NUM> and its surroundings rather than the whole of the casing <NUM> for the sake of illustration, and the other parts of the casing <NUM> are not restrictive of the present disclosure.

The waterproof lid structure <NUM> corresponds in position to the opening <NUM> and looks like a door substantially. The waterproof lid structure <NUM> essentially comprises a base <NUM>, a waterproof component <NUM>, a movable latch lid <NUM> and a plurality of coupling elements <NUM>.

The base <NUM> is penetrated by a plurality of through holes 211B and pivotally disposed on one side of the opening <NUM>. In this embodiment, the base <NUM> comprises a supportive sheet metal <NUM> and two securing sheet metals <NUM>. The supportive sheet metal <NUM> corresponds in shape to the opening <NUM> and is a slender sheet metal plate made of stainless steel, but the present disclosure is not limited thereto. For example, the supportive sheet metal <NUM> can be any other metal plate of high mechanical strength. The through holes 211B are disposed on the supportive sheet metal <NUM>. The through holes 211B are equidistantly disposed along the longitudinal direction of the supportive sheet metal <NUM>. The securing sheet metals <NUM> are fixed to one side of the opening <NUM> through two screwing elements A. The supportive sheet metal <NUM> is pivotally fitted to the securing sheet metals <NUM> and thus can turn over relative to the securing sheet metals <NUM>.

The waterproof component <NUM> corresponds in shape to the supportive sheet metal <NUM> and thus is oblong. In this embodiment, the waterproof component <NUM> comprises a joint portion <NUM> and a seal portion <NUM> which are connected. The joint portion <NUM> is made of hard plastic. The seal portion <NUM> is made of soft plastic (for example, silica gel or rubber), and both are coupled together by bi-injection to manufacture the waterproof component <NUM>. The joint portion <NUM> is disposed on one side of the supportive sheet metal <NUM> and corresponds in position to the opening <NUM>. The seal portion <NUM> hermetically seals the opening <NUM>. Therefore, the soft seal portion <NUM> hermetically seals the opening <NUM> effectively by resilient deformation to thereby attain a minimum waterproof and dustproof rating of IP66. The tolerance of the joint portion <NUM> made of plastic is effectively controlled during a production process to enable the joint portion <NUM> to snap-engage with the supportive sheet metal <NUM>. A plurality of positioning posts 221A are protrudingly disposed at the joint portion <NUM> of the waterproof component <NUM> and correspond in position to the through holes 211B of the supportive sheet metal <NUM>, respectively. The positioning posts 221A pass through the through holes 211B, respectively. Therefore, the supportive sheet metal <NUM> and the waterproof component <NUM> position each other.

The coupling elements <NUM> correspond in position to the passages <NUM> and the positioning posts 221A, respectively. In this embodiment, the coupling elements <NUM> are step bolts. The coupling elements <NUM> each comprise a rod portion 241A and a head portion 241B disposed at one end of the rod portion 241A. The other ends of the rod portions 241A pass through the passages <NUM> and then pass through the through holes 211B of the supportive sheet metal <NUM> before being fastened to the positioning posts 221A of the waterproof component <NUM>, respectively, allowing the head portions 241B to stop at the outer sides of the passages <NUM> of the movable latch lid <NUM>, respectively. Therefore, the waterproof component <NUM> and the movable latch lid <NUM> are fixed together. Owing to the passages <NUM>, it is feasible for the movable latch lid <NUM> to slide along the rod portion 241A and thus move leftward and rightward relative to the supportive sheet metal <NUM>, and the displacement of the movable latch lid <NUM> is limited by the length of extension of the passages <NUM>.

A handle <NUM> is protrudingly disposed on the outer side of the movable latch lid <NUM> and between any two adjacent ones of the passages <NUM>. In this embodiment, the handle <NUM> is slender and perpendicular to the direction of extension of the movable latch lid <NUM> to render it easy for users to push the handle <NUM> and thereby trigger the leftward and rightward movement of the movable latch lid <NUM>. At least a latch portion <NUM> is protrudingly disposed at the shield 230A lying above the movable latch lid <NUM>, and at least a fastening groove <NUM> corresponding in position to the latch portion <NUM> is disposed at the opening <NUM> of the casing <NUM>. In this embodiment, the latch portions <NUM> and the fastening grooves <NUM> are each in the number of three, whereas the latch portions <NUM> are each a bump, and the fastening grooves <NUM> each have a slot, but the present disclosure is not limited thereto.

In this embodiment, the coupling elements <NUM>, through holes 211B and positioning posts 221A are in the number of three, respectively, but the present disclosure is not limited thereto. For example, the coupling elements <NUM>, through holes 211B and positioning posts 221A may also be in the number of two or four, respectively. The supportive sheet metal <NUM> further has a slot 211C. In this embodiment, the slot 211C lies above the middle one of the through holes 211B. A dowel 221B corresponding in position to the slot 211C is protrudingly disposed at the joint portion <NUM> of the waterproof component <NUM>. The dowel 221B is penetratingly disposed at the slot 211C. A resilient hook <NUM> corresponding in position to the dowel 221B is disposed at the movable latch lid <NUM>. The resilient hook <NUM> is engagingly fitted to the dowel 221B upon the axial movement of the movable latch lid <NUM>. Referring to <FIG> and <FIG>, users confirm whether the movable latch lid <NUM> has moved to a fastening position or a release position by observing variations in engagingly fitting the resilient hook <NUM> to the left and right sides of the dowel 221B.

Referring to <FIG>, preferably, the waterproof lid structure <NUM> of the present disclosure further comprises a magnet <NUM> and a decorative plate <NUM>. A receiving chamber 221C is disposed at the joint portion <NUM> of the waterproof component <NUM>. A magnet through-hole 211D is penetratingly disposed at the supportive sheet metal <NUM>. The magnet <NUM> is received in the receiving chamber 221C and penetrates the magnet through-hole 211D so as to be held by the movable latch lid <NUM>. Therefore, the magnet <NUM> works along with a detector (not shown) disposed in the opening <NUM> to detect whether the waterproof lid structure <NUM> is opened or shut. The decorative plate <NUM> is a slender plastic plate penetrated by a handle through-hole <NUM>. The decorative plate <NUM> is engagingly disposed on the outer side of the movable latch lid <NUM>. The handle <NUM> is protruded from the handle through-hole <NUM> and exposed from the decorative plate <NUM>. Therefore, the decorative plate <NUM> conceals the passages <NUM>, bolts <NUM> and resilient hook <NUM> to ensure the neat, visually pleasing appearance of the waterproof lid structure <NUM>. Moreover, the handle <NUM> protruding from the handle through-hole <NUM> is easy to push by users.

Claim 1:
An electronic device, comprising:
a casing (<NUM>) having an opening (<NUM>);
a waterproof lid structure (<NUM>) corresponding in position to the opening (<NUM>) and comprising:
a supportive sheet metal (<NUM>) having an axle (211A), with the axle (211A) pivotally connected to a side of the opening (<NUM>);
a waterproof component (<NUM>) for hermetically sealing the opening (<NUM>), with the waterproof component (<NUM>) disposed on a side of the supportive sheet metal (<NUM>) and corresponding in position to the opening (<NUM>);
a movable latch lid (<NUM>) for covering another side of the supportive sheet metal (<NUM>), with the movable latch lid (<NUM>) penetrated by a plurality of passages (<NUM>); and
a plurality of bolts (<NUM>) corresponding in position to the passages (<NUM>), respectively, the bolts (<NUM>) each comprising a rod portion (241A) and a head portion (241B) disposed at an end of the rod portion (241A), wherein the rod portions (241A) pass through the passages (<NUM>) and the supportive sheet metal (<NUM>), respectively, and another end of each said rod portion (241A) is fastened to the waterproof component (<NUM>), allowing the head portion (241B) to stop at an outer side of the movable latch lid (<NUM>),
wherein the passages (<NUM>) extend in a direction parallel to the axle (211A) and
wherein a handle (<NUM>) is protrudingly disposed on an outer side of the movable latch lid (<NUM>), whereas a latch portion (<NUM>) is disposed on an inner side of the movable latch lid (<NUM>), wherein the opening (<NUM>) has a fastening groove (<NUM>) corresponding in position to the latch portion (<NUM>), such that the handle (<NUM>) can be pushed to cause the movable latch lid (<NUM>) to move along the direction of extension of the passages (<NUM>) to a fastening position, allowing the latch portion (<NUM>) to be latched into the fastening groove (<NUM>), and allowing the displacement of the movable latch lid (<NUM>) to be limited by the length of extension of the passages (<NUM>).