JP2561564B2 - Desk opening lid device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid device for closing or opening an opening formed in a top plate of a desk.

[0002]

2. Description of the Related Art Generally, a top plate of a desk for students of an LL device (language laboratory) is provided with an opening for incorporating a tape deck, and the lid of the opening is opened at the time of use. When used, the opening is closed with a lid so that it can be used as a normal desk.

An example of a conventional lid device for an opening of a desk for an LL device will be described with reference to FIG. FIG. 10 is a vertical cross-sectional view of an example of a conventional lid device for an opening of a desk.

In FIG. 10, an opening 14 having a substantially rectangular shape is formed on the back side of the top plate 12 of the desk 10.
The housing 16 is disposed under the. And this opening 14
A lid 18 is provided so as to close the. Furthermore, desk 10
A storage recess 20 that is deep in the vertical direction for storing the lid 18 is provided on the innermost side of the. Protrusions 22 and 22 are provided at both inner ends of the lid 18, and guide rails 24 and 24 with which the protrusions 22 and 22 engage are provided on both sides of the storage recess 20.

In order to open the lid 18, the front side of the lid 18 is lifted to be vertical by using the projections 22 and 22 as swinging shafts, and the lid 18 is dropped vertically into the storage recess 20. To close the lid 18, the lid 18 may be pulled up from the storage recess 20 in the vertical direction, and the tip of the lid 18 may be tilted toward the front side.

[0006]

In the conventional lid device for the opening portion of the desk as shown in FIG. 10, the lid 18 is opened.
The student who wants to use the L device must manually perform it, which is troublesome. Moreover, the lid 1
When the 8 is vertically dropped into the storage recess 20, the hand is easily released from the lid 18 during the dropping, and the lid 18 is suddenly dropped by its own weight and a large noise is generated to be stored. When a lesson is started in the LL classroom or the like, the noise generated from a large number of desks 10 all at once due to the opening of the lid 18 is extremely large, and there has been a strong demand for improvement.

The present invention has been made in view of the circumstances of such a conventional lid device for an opening portion of a desk, and the opening of the desk which saves the trouble of opening the lid and does not generate noise during the opening. An object of the present invention is to provide a lid device for a part.

[0008]

In order to achieve the above object, a lid device for an opening of a desk according to the present invention has an opening formed in a top plate of the desk, and a housing is provided under the opening. A pair of arms is swingably attached to both side walls of the housing, a lid for closing the opening is fixed to the free ends of the arms, and the arms and the lid swing by their own weight. An opening mechanism is provided so that the lid is provided with a locking mechanism that locks the arm at a closing position where the lid closes the opening, and a stop member that restricts swinging of the arm due to its own weight at the opening position. Further, a taper-shaped frictional resistance member having a large thickness in the swinging direction of the arm due to its own weight is disposed on at least one side wall of the housing so that the arm swings while making contact with the arm. ing.

Further, instead of the tapered frictional resistance member whose thickness is increased in the swinging direction by its own weight, the lateral width is gradually widened in the swinging direction of the arm by its own weight and the contact area with the arm is increased. A frictional resistance member having a large width may be arranged so that the arm swings while making contact with the arm.

Further, instead of the tapered frictional resistance member whose thickness is increased in the swing direction by its own weight, the contact position with the arm is moved away from the swing axis in the swing direction of the arm by its own weight. It is also possible to dispose the friction resistance member so that the arm swings while making contact with the arm.

Further, the locking mechanism is provided with a locking metal piece that can project and retreat in a direction orthogonal to the swing surface of the arm, and the locking metal piece is elastically biased by a spring in the projecting direction and the electromagnet By the operation, it is made to retreat against the elastic bias, and the contact portion of the locking metal fitting with respect to the arm in the swing direction of the arm due to its own weight is made orthogonal to the swing surface of the arm, and The contacting part of the locking metal fitting with respect to the arm in the direction opposite to the swinging direction of the arm intersects the swinging surface of the arm at an angle so that the weight of the arm causes a force in the opposite direction to the swinging direction of the arm. The locking fitting may be configured to retract.

[0012]

When the locking mechanism is released, the arm and the lid swing due to their own weight, and the opening is automatically opened. And
Due to the tapered thickness of the friction resistance member, the surface pressure of the contact surface with the arm increases as the weight advances in the swinging direction due to its own weight, and the friction resistance increases accordingly. Therefore, due to this frictional resistance force, the arm is prevented from abruptly swinging and is gently swung, and the opening lid is opened gently.

Further, if the contact area of the friction resistance member becomes wider as the arm advances in the swinging direction due to its own weight, if the surface pressure per unit contact area is constant,
The larger the contact area, the greater the frictional resistance, so
The arm is gently swung in the swinging direction by its own weight to open the lid.

If the frictional resistance member is arranged so that the contact position with the arm becomes farther from the swing axis as the arm advances in the swinging direction due to its own weight, the contact position with the arm remains constant even if the frictional resistance force is constant. As the distance from the swing axis increases, the torque acting in the direction to prevent the swing of the arm increases,
The arm is gently swung in the swinging direction by its own weight to open the lid.

Further, the locking metal of the locking mechanism is projected to the rocking surface of the arm by the elastic biasing of the spring to lock the rocking of the arm by its own weight, and the electromagnet is operated to move from the rocking surface of the arm. If it is retracted, the opening operation of the lid can be easily performed automatically by controlling the energization of the electromagnet. Further, the abutting portion of the locking metal fitting on the arm in the direction opposite to the arm swinging direction by projecting to the swinging surface of the arm is formed so as to cross the swinging surface of the arm obliquely, and the arm by the own weight is formed. If a force in the direction opposite to the swinging direction of is used to retract the locking metal, the locking metal resists the elastic bias of the spring by swinging the arm in the direction to close the lid. And retracts, and at the position where the lid is closed, the elastic force of the spring re-projects and the swing of the arm due to its own weight is locked and restrained.

[0016]

Embodiments of the present invention will be described below with reference to FIGS.
Will be described with reference to. FIG. 1 is a perspective view of an essential part of a desk opening device according to an embodiment of the present invention when the lid is closed, and FIG. 2 is a perspective view of an essential part of the lid of FIG.
3 is an overall perspective view of a desk for an LL device to which the lid device for the opening of the desk of the present invention is applied, FIG. 4 is a vertical cross-sectional view of FIG. 3, and FIG. 6 is a cross-sectional view of FIG. 6, FIG. 6 is a front view of an example of a locking mechanism, and FIG. 7 is a plan view of FIG.

1 to 7, the desk 30 for students of the LL device is for two persons, and substantially rectangular openings 34, 34 are formed on the left and right sides of a top plate 32 of these desks. A television opening 38 for incorporating the monitor television 36 is provided between the two openings 34, 34. Opening 3
Openable and closable lids 40 and 40 are provided on the panels 4 and 34, respectively, and housings 44 and 44 for incorporating the tape decks 42 and 42 are provided below the openings 34 and 34, respectively. Note that FIG. 3 shows a state in which the lid 40 of the one opening 34 is opened and the lid 40 of the other opening 34 is closed.

The housing 44 is mounted on the lower surface of the top plate 32 with the mounting metal 4
The side plates of the housing 44 itself are fixed to the back surface of the side plate of the desk 30 with screws and the like while being fixed with screws and the like using the screws 6 and 46. In addition to the tape deck 42 being incorporated in the housing 44, a storage space 48 for storing headphones and the like is provided.

The left and right side walls 44a of the housing 44,
44a has a pair of arms 50, 50 swingably mounted on a swing shaft 5
It is attached by 2, 52. These arms 5
In Nos. 0 and 50, the strip is cut diagonally at the center, the diagonally cut portion is bent to form a mounting portion for fixing the lid 40, and the other portions are bent at right angles at both ends by a slight dimension. And an arm portion having a U-shaped cross section is formed, and the arm portion has some elasticity. And these arms 50,
The lid 40 is fixed to the attachment portion of the free end of 50. Here, the positions of the swing shafts 52, 52 are arranged such that the arms 50, 50 swing in the direction in which the lid 40 is opened, that is, in the front side of the desk 30 by the weight of the arms 50, 50 and the lid 40. .

Further, a locking mechanism 60 is provided so as to project and retreat so as to intersect at right angles with the swing surface of the arm 50 from a rectangular hole 54 provided in one side wall 44a of the housing 44,
The arm 50 is placed at a position where the lid 40 closes the opening 34.
Is locked. Then, at the position where the lid 40 opens the opening 34, the stop members 80, 80 made of an elastic member such as rubber for stopping and controlling the swing of the arms 50, 50 are provided on both side walls 44 a of the housing 44. 44a, respectively.

Further, both side walls 44a, 44a of the housing 44
Further, friction resistance members 90, 90 made of a wear-resistant resin such as a tapered Duracon, which increases the thickness in the swinging direction of the arms 50, 50 by its own weight, are provided. The arms 50, 50 have the friction resistance members 90,
It is configured to swing while making contact with 90, and the surface pressure per unit area becomes maximum immediately before the swing of the arms 50, 50 is restricted by the stop members 80, 80, so that the maximum frictional resistance acts. It

The locking mechanism 60 is fixed to the inner wall of the housing 44 by a base metal fitting 62, and has a tip portion projecting and retracting in a direction intersecting the swinging surface of the arm 50 at a right angle from the rectangular hole 54. A stopper 64 is provided. Further, the locking metal piece 64 is elastically biased in the protruding direction by the spring 66, and is also retracted against the elastic bias of the spring 66 by the operation of the electromagnet 68. Then, the casing 4 is attached to the swing surface of the arm 50.
An abutting portion 64a, which abuts in the swinging direction of the arm 50 by its own weight, at the tip portion of the locking metal fitting 64 protruding from the rectangular hole 54 formed in the side wall 44a of the No. 4 is orthogonal to the swinging surface of the arm 50. Thus, the force in the swinging direction of the arm 50 due to its own weight does not exert a force in the retracting direction on the locking fitting 64 at least. However, the abutting portion 64b, which abuts in the opposite direction to the swinging direction of the arm 50 due to its own weight at the tip of the locking metal fitting 64, is formed so as to obliquely intersect the swinging surface of the arm 50, and the arm due to its own weight. Fifty
With the force in the direction opposite to the swinging direction, the force in the backward direction acts on the locking metal fitting 64.

In this structure, the lid 40 has the opening 34.
In the closed state, the locking metal fitting 64 of the locking mechanism 60 projects from the side wall 44a of the housing 44 to the swing surface of the arm 50, and the contact portion 64a locks the swing of the arm 50 by its own weight. It is regulated and the closed state is maintained. As shown in FIG. 4, in the closed state of the lid 40, the back end of the lid 40 elastically contacts the elastic member 70 provided on the desk 30 to cover the lid 40.
Rattling is prevented.

When the electromagnet 68 is energized to operate, the locking metal fitting 64 retreats against the elastic bias of the spring 66, and the swinging restriction of the arm 50 due to its own weight is released. As a result, the arms 50, 50 and the lid 40 swing by their own weight to open the opening 34.

By the way, in the rocking process of the arms 50, 50 and the lid 40 by its own weight, the rotational moment becomes larger as the arm 50 moves in the rocking direction by its own weight. However, the arm 50,
Since 50 is in contact with the tapered frictional resistance members 90, 90, it receives a large frictional resistance force as it advances in the swinging direction due to its own weight, and the frictional resistance force immediately before the swinging is restricted by the stop members 80, 80. Is the maximum. For this reason, the arms 50, 50 swing gently, and the stop member 8 is extremely lightly moved.
Contact 0,80. Therefore, the lid 40 is opened gently, no large noise is generated when the lid 40 is stopped, and the lid 40 does not rebound. Further, due to the gentle opening of the lid 40, it is safe without the fingers or the like being pulled in together with the lid 40.

From the opened state of the lid 40, when the finger is hung on the L metal fitting 40a provided at the rear end portion of the lid 40 and the lid 40 is pulled up and rocked to the inner side of the desk 30, the locking metal fitting 64 of the locking metal fitting 64 is pulled. The force acting on the obliquely formed contact portion 64b is converted into a force that causes the locking metal fitting 64 to retreat against the elastic bias of the spring 66, and the locking metal fitting 64 retracts from the swing surface of the arm 50. The arm 50 is allowed to swing. Further, when the arm 50 swings to the position where the opening 40 is closed by the lid 40, the locking metal fitting 64 again causes the spring 66 to contact the swing surface of the arm 50.
The elastic urging force causes the lid 40 to project and maintain the closed state of the lid 40.

FIG. 8 is a side view of the essential parts of another embodiment of the lid device for the opening of the desk according to the present invention. In FIG. 8, the same or equivalent members as those in FIGS. 1 to 7 are designated by the same reference numerals, and a duplicate description will be omitted.

A feature of the other embodiment shown in FIG. 8 is that the side walls 44a, 44a of the housing 44 are made elastic by gradually increasing the lateral width in the swinging direction of the arms 50, 50 due to their own weight. Friction resistance member 10 made of felt
0 and 100 are arranged. And arm 5
0 and 50 oscillate while contacting with the friction resistance members 100 and 100, and the contact area between the friction resistance members 100 and 100 and the arms 50 and 50 becomes wider as the friction resistance members 100 and 100 progress in the rocking direction due to their own weight.

In such a structure, if the surface pressure per unit area of the arms 50, 50 contacting the resistance friction members 100, 100 is constant, the friction resistance increases as the contact area increases. Therefore, as the arms 50, 50 move in the swinging direction due to their own weight, they receive a larger frictional resistance force, and like the embodiments shown in FIGS.
At 0, the rock is gently rocked.

FIG. 9 is a side view of the essential portions of a lid device for an opening of a desk according to another embodiment of the present invention. In FIG. 9, members that are the same as or equivalent to those in FIGS. 1 to 7 are given the same reference numerals and redundant description is omitted.

A feature of yet another embodiment shown in FIG. 9 is that the side walls 44a, 44a of the housing 44 have contact positions with the arms 50, 50 in the swinging direction of the arms 50, 50 due to their own weight. A frictional resistance member 110 made of a resin or the like having a belt shape and having wear resistance so as to move away from the swing shafts 52, 52,
110 has been arranged.

As the arms 50, 50 move in the swinging direction due to their own weight, the position contacting the resistance friction members 110, 110 becomes farther from the swinging shafts 52, 52, and the torque acting in the direction of blocking the swinging increases. . Therefore, as the arms 50, 50 move in the swinging direction by their own weight, the torque for preventing the swinging increases, and the arms 50, 50 swing gently as in the embodiment shown in FIGS. Done.

In the above embodiment, the frictional resistance members 90, 90 having a tapered thickness increase in friction as the surface pressure with the arms 50, 50 increases in the swinging direction due to its own weight and progresses in the swinging direction. It suffices that the resistance force becomes large, and it is sufficient that either one of the friction resistance members 90, 90 or the arms 50, 50 has a slight elasticity. Then, the adjustment of the frictional resistance force is performed by the arms 50, 50 and the side walls 44 a, 44 of the housing 44.
It is only necessary to change the distance from a or to shift the positions of the friction resistance members 90, 90 in the swinging direction of the arms 50, 50. The frictional resistance members 90, 90 may be disposed on at least one side wall 44a of the housing 44.

The friction resistance members 90, 100, 110 shown in the above three embodiments are the arms 50, 5 by their own weight.
The effect of blocking the rapid rocking of 0 and gently rocking is the same, but its physical action is different. Therefore,
Of course, the frictional resistance member may be configured such that the plurality of physical actions described above act simultaneously.

Further, the energization of the electromagnet 68 of the locking mechanism 60 may be controlled remotely from the teacher's desk in the LL classroom, or the individual desks 30 for students may be provided with an energization control means. Further, the locking mechanism 60 is not limited to the structure of the above-described embodiment, and instead of the electromagnet 68, the locking metal member 64 may be manually operated to retreat against the elastic bias of the spring 66. . Then, the opening 34 is covered with the lid 40.
If the arm 50 is configured to have a small rotational moment due to its own weight in the state of being blocked by, the electromagnet 68 can be a small one having a small driving force, and the noise generated by the operation of the electromagnet 68 itself can be reduced. It can be small.

[0036]

As described above, since the lid device for the opening of the desk of the present invention is constructed, the following special effects are obtained.

Since the lid is opened by its own weight when the locking mechanism is released, the lid can be automatically opened without using a drive source such as a motor. Moreover, the lid is gently opened by the frictional resistance force of the frictional resistance member, so that no noise is generated when the lid is stopped and the lid does not bounce.

Furthermore, if the locking mechanism is released by using an electromagnet, the opening of the lid can be controlled by remote control. In addition, the locking metal is projected to the swing surface of the arm by the elastic biasing of the spring, and the contact portion when the arm swings in the direction opposite to the swing direction due to its own weight crosses the swing surface diagonally. If it is formed so that it can be retracted against the elastic bias of the spring by the force that swings the arm in the opposite direction, the lid is closed without the need to operate the locking metal. It can be in a state. Then, at the position where the lid is in the closed state, the locking metal piece is projected again by the elastic bias of the spring, and the swinging of the arm due to its own weight is locked and restrained, so that the closed state is easily maintained.

Further, if a tape deck is incorporated in the housing and is applied as a desk of the LL device, even when the lids of many desks installed in the LL classroom are simultaneously opened due to the start of lessons, etc. It produces little noise and is extremely convenient in practice.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a desk opening device according to an embodiment of the present invention with a lid closed.

FIG. 2 is a perspective view of an essential part of the lid of FIG. 1 in an opened state.

FIG. 3 is an overall perspective view of a desk for an LL device to which the lid device for the opening of the desk of the present invention is applied.

4 is a vertical cross-sectional view of FIG.

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

FIG. 6 is a front view of an example of a locking mechanism.

FIG. 7 is a plan view of FIG.

FIG. 8 is a side view of a main part of another embodiment of the lid device for the opening of the desk according to the present invention.

FIG. 9 is a side view of a main portion of a lid device for an opening of a desk according to still another embodiment of the present invention.

FIG. 10 is a vertical cross-sectional view of an example of a conventional lid device for an opening of a desk.

[Explanation of symbols]

 30 desk 32 top plate 34 opening 40 lid 42 tape deck 44 housing 44a housing side wall 50 arm 52 swinging shaft 60 locking mechanism 64 locking metal fitting 64b abutting portion of the tip of the locking metal fitting 66 spring 68 electromagnet 80 Stop member 90, 100, 110 Friction resistance member

Claims (5)

(57) [Claims] 1. An opening is formed in a top plate of a desk, a housing is arranged under the opening, and a pair of arms is swingably attached to both side walls of the housing. A lid that closes the opening is fixed to the free end of the arm, and the opening is opened by the swing of the arm and the lid due to its own weight, and the arm is opened at the closing position where the lid closes the opening. A locking mechanism that locks the arm is provided, and a stop member that restricts the swinging of the arm due to its own weight at the open position is provided. Furthermore, at least one side wall of the housing is provided with a thickness in the swinging direction of the arm due to its own weight. A lid device for an opening portion of a desk, wherein an enlarged tapered frictional resistance member is arranged so as to swing while the arm is in contact with the arm. 2. A desk opening lid device according to claim 1, wherein instead of a tapered frictional resistance member having a greater thickness in said swinging direction due to its own weight, said desk facing toward the swinging direction of said arm. A cover device for an opening portion of a desk, wherein a friction resistance member whose width is gradually widened so that a contact area with the arm is widened is arranged so as to swing while the arm is in contact with the arm. . 3. The desk opening device according to claim 1, wherein the tapered frictional resistance member whose thickness is increased in the swing direction by its own weight is replaced by the arm swing direction by its own weight. A lid device for an opening of a desk, characterized in that a frictional resistance member is arranged so that its contact position with the arm moves away from the swing axis so that the arm swings while making contact with the arm. 4. The desk lid device according to any one of claims 1 to 3, wherein the locking mechanism is provided with a locking metal member that is capable of projecting and retracting in a direction orthogonal to a swing surface of the arm. The locking metal is elastically biased by a spring in the protruding direction and is retracted by the action of an electromagnet against the elastic bias, and the locking is performed on the arm in the swinging direction of the arm by its own weight. The contact portion of the metal fitting is orthogonal to the swing surface of the arm, and the contact portion of the locking metal fitting with respect to the arm in a direction opposite to the swing direction of the arm due to its own weight is oblique to the swing surface of the arm. A lid device for an opening of a desk, characterized in that the engaging metal fitting is configured to retreat by a force in a direction opposite to the swinging direction of the arm due to its own weight so as to cross. 5. The lid device for an opening portion of a desk according to claim 1, wherein a tape deck for an LL device is incorporated in the housing.