JP2520909Y2 - Lid opening and closing mechanism - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid opening / closing mechanism, and more particularly, to a lid-case engagement mechanism in which the lid is held open to the case at a predetermined opening angle and the lid is opened beyond the opening angle. The present invention relates to an opening / closing mechanism of a lid that is removed.

[0002]

2. Description of the Related Art Since a case with a lid such as an electronic device is often manufactured by means of molding such as resin molding, the opening and closing mechanism of this kind of lid has a case and a lid respectively molded. Generally, a structure that can be assembled by simply engaging with each other is adopted.

8 to 11 are views for explaining a conventional lid opening / closing mechanism of this type, FIG. 8 is an explanatory view of the opening / closing state of the lid with respect to the case, and FIG. 9 is a main part with the lid closed. Explanatory drawing, FIG. 10 is a BB sectional view of FIG. 9, and FIG.

As shown in FIG. 8, a lid is rotatably engaged with the case 1 at one end of the case 1. When the lid is opened with respect to the case 1 by a predetermined angle, the lid 2 is opened at the opening angle. It is designed to be held by the case 2. That is, as shown in FIGS. 9 and 10, a cylindrical locking shaft 3 is projectingly formed from both inner side surfaces on one end side of the lid 2, and the upper plate 1 of the case 1 is formed.
An engaging portion 5 having a width slightly larger than the radius of the locking shaft 3 is provided in a, and the locking shaft 3 is fitted into the engaging portion 5 and rotatably engaged with the locking shaft 3. A stopper 3a is provided so as to project from the locking shaft 3, and when the lid 2 is opened or closed with respect to the case 1 by a predetermined angle (for example, 96 °) with respect to the case 3, the stopper 3a of the case 1 is provided. The lid 2 is held against the case 1 at the position where it abuts against the end face. On the other end side of the case 1, a hook (not shown) is formed on the lid 2, and the upper plate 1 of the case 1 is formed.
An engaging piece (not shown) capable of engaging with the hook is provided on a.

In the conventional lid opening / closing structure having such a structure, when the lid 2 is opened from the closed state, the engagement between the hook and the engaging piece is disengaged from the engagement state between the hook and the engaging piece. To be done. Then, the lid 2 is rotated around the locking shaft 3 to be opened, and when the opening angle of the lid 2 reaches a predetermined angle, the stopper 3a hits the end face of the case 1 as shown in FIG. The rotation of 2 is blocked, and the lid 2 is held by the case 1 while keeping its opening angle.

[0006]

When this type of lid opening / closing mechanism is applied to, for example, an auxiliary input device of a computer, the lid is kept closed when not in use, and the lid is kept closed when in use. It is convenient if it can be used by removing it from the case 1 and making it easy to use.

However, in the above-described conventional lid opening / closing mechanism, the engagement state between the locking shaft of the lid and the engagement portion of the case cannot be easily removed or engaged, and the lid engagement is forced. The engagement part that disengages the stop shaft from the engagement part of the case is damaged,
There was a risk that it would become unusable.

The present invention has been made in view of the problems of the above-mentioned conventional lid opening / closing mechanism, and an object thereof is to stably open / close the lid and to easily disengage the lid from the case. It is to provide an opening / closing mechanism for the lid which is also possible.

[0009]

In order to achieve the above object, the present invention provides an engaging portion provided on one end side of a case,
A lid opening / closing mechanism in which the lid is rotatably engaged with the locking shaft portion, and when the lid is rotated about the locking shaft by a predetermined angle, the lid is held in an open state with respect to the case. In the locking shaft, a cross section perpendicular to the shaft center is formed in a substantially semicircular shape, and the engaging portion is provided with an opening through which only a small diameter portion of the locking shaft can be inserted and withdrawn. A curved contact surface that faces the semi-circular surface of the locking shaft when the lid is rotated is provided, and one end of the lid contacts the case at the rotation position of the predetermined angle. A stopper for holding the lid is provided, and when the lid is rotated around the locking shaft by a predetermined angle, the lid is held in an open state with respect to the case, and the lid is moved beyond the predetermined angle. When rotated, the arc portion of the semicircular surface slides on the contact surface with the contacted stopper as a fulcrum. Are a configuration in which the small-diameter portion is engaged with the locking shaft and the engagement portion out of the opening is removed.

[0010]

When the lid is opened from the locked state by the means described above, the lid is rotated about the locking shaft which has a substantially semicircular cross section and is engaged with the engaging portion of the case, and the lid is rotated. The opening angle to the case increases. When the opening angle reaches a predetermined angle, the stopper provided on the lid comes into contact with the end surface of the case, so that the lid is held at the predetermined angle with respect to the case. When the lid is further rotated beyond this predetermined angle, the lid pivots around the contact portion between the stopper and the outside of the case as a fulcrum, and the arc surface of the locking shaft makes contact with the curved surface of the engaging portion of the case. Sliding on the surface, the small diameter part of the locking shaft with a semicircular cross section can pass through the opening of the engaging part of the case, disengage from the engaging part, and the lid separates from the case. To be done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7, in which the same parts as those of FIGS. Here, FIG. 1 is an explanatory view showing the entire configuration of the embodiment, FIGS. 2 to 4 are explanatory views from a closed state of the lid to an open holding state of a predetermined angle, and FIG. 5 is an operation of releasing the engagement between the lid and the case. FIG. 6 is an explanatory view of the principal part of the AA cross section of FIG. 2, and FIG. 7 is an explanatory view of the lock part of the embodiment.

As shown in FIGS. 1 to 4, in the embodiment, engaging portions 7 are provided on both sides of the upper plate 1a of the case 1 at one end side of the case 1, and both ends of the lid 2 at the one end side. On the inner side surface, a locking shaft 6 having a substantially semicircular cross section perpendicular to the shaft center is formed to project, and the locking shaft 6 is rotatably engaged with the engaging portion 7. Engagement piece portion 7 on the one end side of the engagement portion 7
A curved facing surface 7b is formed on the upper part of a, and an arc surface having a diameter slightly larger than the semicircular shape of the locking shaft 6 is provided at a position facing the engaging piece portion 7a of the engaging portion 7. 7c is formed. The distance between the engaging piece 7a and the arcuate surface 7c (opening) is the smallest on the upper end side of both, and the distance of this opening is greater than the radius of the locking shaft 6 (that is, the small diameter portion). It is set slightly large. Further, at the position where the lid 2 is rotated by 96 ° with respect to the case 1, the engaging shaft 6 is attached to the lid 2 so that the engaging shaft 6 is located in a substantially circular flat portion in the up-down direction.
Are formed. A stopper 2A is provided at the end of the lid 2. The stopper 2A is a rib that comes into contact with the outer surface of the case 1 when the lid 2 is opened about the locking shaft 6 and rotated by 96 °.

Next, the opening operation of the lid and the separating operation from the case in the embodiment having such a structure will be described with reference to FIGS. 2 to 5.

When the lid 2 is rotated clockwise around the locking shaft 6 from the closed state of the lid 2 of FIG. 2, the hook 2b shown in FIG. 7 is disengaged from the engaging piece 1b. And further,
When the lid 2 is rotated, as shown in FIG. 3, the semicircular surface of the locking shaft 6 rotates while being in contact with the arcuate surface 7c and the engaging piece portion 7b. When the lid 2 is rotated about the locking shaft 6 by 96 °, the stopper 2A comes into contact with the outer surface of the case 1 as shown in FIG. 4, so that further rotation of the lid 2 is prevented and the lid 2 is stopped. To do.

By the way, in order to remove the lid 2 from the case 1, from the holding state of the lid 2 to the case 1 shown in FIG.
Further, the lid 2 is rotated clockwise in the figure. In this way, the lid 2 is rotated around the contact portion of the stopper 2A with the end face of the case 1 as a fulcrum, and the arc portion of the locking shaft 6 is engaged with the engaging piece as shown by an arrow F in FIG. It moves diagonally upward while sliding on the curved facing surface 7b of the portion 7a.
As described above, the minimum horizontal facing distance between the upper end of the engaging piece 7a and the upper end of the arcuate surface 7c is set to be slightly larger than the radius of the locking shaft 6. The locking shaft 6 of is slid out from the engaging portion 7 while sliding on the contact surface 7b. In this way, from the state where the lid 2 is held at the open angle of 96 ° (FIG. 4), the lid 2 is further rotated as shown in FIG. The engagement with 7 is released smoothly. On the other hand, in order to attach the locking shaft 6 of the lid 2 to the engaging portion 7 of the case 1, the locking shaft 6 is placed between the engaging piece portion 7a and the arcuate surface 7c with the lid 2 substantially vertical.
Can be easily carried out by inserting into the engaging portion 7 and closing the lid.

In the above-described embodiment, when the lid 2 is closed, the hook 2b of the lid 2 and the engaging piece 1b of the case 1 are engaged with each other, and the lid 2 is attached to the case 1. The open surface is kept stable and the lid does not come off even if you carry it around. Then, when the lid 2 is opened around the locking shaft 6, the locking shaft 6 does not disengage from the engaging portion 7 and the lid 2 is released.
Is opened and the opening angle reaches 96 °, the stopper 2A comes into contact with the outer surface of the case 1 and stops, and the state in which the lid is opened by 96 ° is stably maintained. Therefore, for example, when it is applied to an auxiliary input device of a computer, it is always carried around with the lid 2 closed as necessary, and when the auxiliary input operation is performed temporarily, the lid 2 is attached to the case 1. On the other hand, the auxiliary input can be performed with the state of being opened by 96 °. Then, in the embodiment, when the lid 2 is further opened by 96 ° with respect to the case 1, when the lid 2 is further rotated in the opening direction, the engagement between the lid 2 and the case 1 is smoothly released as described above. Therefore, when performing an auxiliary input operation for a long time, the auxiliary input operation can be performed by removing the lid 2 to make it easier to operate.

[0017]

As described above, according to the present invention, it is possible to provide a lid opening / closing mechanism that can stably open and close the lid and can easily disengage the lid from the case. it can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an embodiment of the present invention.

FIG. 2 is an explanatory view of a closed state of a lid according to an embodiment of the present invention.

FIG. 3 is an explanatory view of an opening movement process of a lid according to an embodiment of the present invention.

FIG. 4 is an explanatory view showing a state in which a lid of the embodiment of the present invention is opened.

FIG. 5 is an explanatory view of the operation of releasing the engagement between the lid and the case according to the embodiment of the present invention.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is an explanatory view showing an engaged state of the hook of the lid and the engaging piece of the case according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing an overall configuration of a conventional lid opening / closing mechanism.

FIG. 9 is an explanatory diagram of a main part showing a state in which the lid of the conventional lid opening / closing mechanism is closed.

10 is a sectional view taken along line BB of FIG.

FIG. 11 is an explanatory diagram of a main part showing a state in which the lid of the conventional lid opening / closing mechanism is opened.

[Explanation of symbols]

 1 Case 1a Upper plate 1b Engagement piece 2 Lid 2A Stopper 2a Hook 3a Locking shaft 5a Engagement part 7 Engagement piece part 8 Arc surface

Claims (1)

(57) [Scope of utility model registration request] 1. An engaging portion provided on one end side of a case,
A lid opening / closing mechanism in which the lid is rotatably engaged with the locking shaft portion, and when the lid is rotated about the locking shaft by a predetermined angle, the lid is held in an open state with respect to the case. In the locking shaft, a cross section perpendicular to the shaft center is formed in a substantially semicircular shape, and the engaging portion is provided with an opening through which only a small diameter portion of the locking shaft can be inserted and withdrawn. A curved contact surface that faces the semi-circular surface of the locking shaft when the lid is rotated is provided, and one end of the lid contacts the case at the rotation position of the predetermined angle. A stopper for holding the lid is provided, and when the lid is rotated around the locking shaft by a predetermined angle, the lid is held in an open state with respect to the case, and the lid is moved beyond the predetermined angle. When rotated, the arc portion of the semicircular surface slides on the contact surface with the contacted stopper as a fulcrum. Closing mechanism of the lid, characterized in that said small-diameter portion is engaged with the locking shaft and the engagement portion out of the opening is removed.