JPH11139082A - Controlling device of attitude of rotary board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable rotation of a board main body while maintaining a state of engagement with the board main body being canceled, and also to enable immediate return to an attitude of engagement at the time when the outer edge part of the board main body rotates and comes to a position of engagement. SOLUTION: A board main body 11 is supported rotatably by a frame 12 and locking devices 13 are provided between the board main body 11 and the frame 12. Each locking device 13 includes a board retainer 25 engaging with and disengaging from an engagement block 17 provided at the outer edge part of the board main body 11 and this board retainer 25 can be displaced to a first position where it so rises as to engage with the engagement block 17 and to a second position where it so lowers that this engagement is canceled. The attitude at the time when the board retainer 25 is displaced to the second position is maintained by engagement of a latch mechanism 26 with the board retainer 25, while the engagement of this latch mechanism can be canceled with lowering thereof at the time when a switch is pressed by the engagement block 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a posture control device for a rotating board, and more particularly to a posture control device capable of easily holding a board body such as a blackboard or a bulletin board in a predetermined posture and rotating the board body.

[0002]

2. Description of the Related Art Conventionally, in a rotating blackboard, a lock device capable of fixing a writing surface of the blackboard body to a frame in a position substantially in a vertical plane, while permitting rotation of the blackboard body as necessary. Are known.
For example, Japanese Utility Model Publication No. 3-29192 discloses a structure in which lock devices are provided at two positions along the lower outer edge when the blackboard body is in a vertical posture. The locking device includes an arm having a groove for receiving and engaging the outer edge portion of the blackboard main body, a spring for urging the arm so that the groove is engaged with the outer edge portion, and an attachment of the spring. It comprises a link mechanism for lowering the free end side of the arm against the force, and an operation knob connected to the link mechanism and provided on a column supporting the blackboard body.

In the lock device, the free end of the arm can be lowered against the urging force of the spring by grasping the operation knob and rotating it in a predetermined direction, thereby allowing the blackboard body to rotate. .

[0004]

However, in the apparatus disclosed in Japanese Utility Model Publication No. 3-29192, when the operating force for lowering the free end of the arm to rotate the blackboard body is released, the arm is released. Is immediately returned to a position where it is engaged with the outer edge portion of the blackboard body by the urging force of the spring. Therefore, when the blackboard body is engaged so that the top and bottom of the blackboard body are reversed, a frictional resistance between the arm and the outer edge portion of the blackboard body tends to be generated, and this becomes a load on the support shaft of the blackboard body. This leads to the inconvenience of causing a backlash around the support shaft over time. In addition, the operation knob is provided on the column, and is separated from the link mechanism for changing the posture of the arm in terms of distance, so that the operating force for performing the predetermined operation of the link mechanism cannot be reduced. Also, in general, when rotating the blackboard body, it is usually performed at a position where a person comes into contact with the support of the rotating blackboard, so that the clothing of the person performing the rotation is caught by the rotation of the operation knob. There is also a risk of being dropped. Furthermore, in the above-described configuration, when performing a series of operations until the blackboard main body is rotated, it is necessary to maintain the operating force on the operation knob, so that the blackboard main body must be rotated with one hand. Therefore, when the blackboard main body is formed of a large size, the work is accompanied by a considerable burden.

[0005]

SUMMARY OF THE INVENTION The present invention was devised in view of such inconvenience, and its object is to maintain the release posture when the engagement with a board body such as a blackboard is released. It is an object of the present invention to provide a rotary blackboard attitude control device that can immediately return to the engaged attitude when the outer edge portion of the board body rotates to the engaged position.

[0006]

In order to achieve the above object, the present invention is directed to a frame mounted on a frame rotatably supporting a board body provided with a writing surface or a posting surface, and attached to an outer edge portion of the board body. In a posture control device for a rotating board provided with a lock device that engages to regulate the rotation of the board main body while releasing the engagement and permits rotation of the board main body, the lock device is fixed to the frame. A base, a board holder displaceable to a first position engaged with the outer edge portion and a second position disengaged from the outer edge portion, and the second position provided on the base. A latch mechanism for maintaining the position when the board holder is displaced during the operation, and disengaging the latch mechanism when the outer edge portion enters the engagement position with the board holder to release the board. And a switch for returning the body to the first position, adopts a configuration that. With such a configuration, when the board holder is displaced to the second position to rotate the board body, the position is maintained by the latch mechanism. Therefore, it is not necessary to continue the operation for maintaining the board holder at the second position, and the rotation of the board body can be performed with both hands. Further, when the outer edge portion of the board body comes into the engagement position with the board holder again by the rotation, frictional contact does not occur between the two and the board body and the board holder have a predetermined relative positional relationship. When the board holding body returns to the first position and holds the board, there is no load caused by the operation,
Factors that cause rattling as in the prior art can also be effectively avoided.

The board holder according to the present invention preferably has a receiving surface capable of receiving the outer edge portion, and a switch pressed by the outer edge portion is arranged in the receiving surface region. . With this configuration, it is sufficient that the board body only contacts the switch,
The above-described rotation operation can be performed smoothly.

[0008] Further, a configuration is also adopted in which an operation lever is integrally connected to the board holder, and the board holder is displaceably provided at a second position by rotation of the operation lever. By positioning the operation lever close to the board body, there is no loss in the transmission of the force of the operation lever, and the operation of displacing the board holder can be performed easily.

Further, the lock devices are provided at a plurality of positions on the same line along the outer edge of the board main body, and the board holders are provided so as to be synchronously rotatable via a common shaft passing through each of the lock devices. It is good to adopt a configuration. With this configuration, for example, even if the lock devices are provided at a plurality of locations and can be operated from either the left or right position, the force of operating one lock device can be applied to the other lock device. This eliminates the need to operate individual lock devices.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the terms “front” and “front end” are used for the near side with reference to FIG. 1, while the terms “rear” and “rear end” are used for the depth side in FIG. It should also be understood that the term "left and right" is also used with reference to FIG.

FIG. 1 is a front view showing an embodiment in which the present invention is applied to a rotating blackboard, and FIG. 2 is a right side view thereof. In these figures, the rotating blackboard 10 includes a board body 11, a frame 12 supporting the board body 11, and a pair of left and right locking devices 13 disposed between the board body 11 and the frame 12. It is configured.

The board body 11 is formed of a white board having both sides of the board as writing surfaces, and the decorative frame 15 forming the outer peripheral edge is provided with the lock device 13 on both left and right portions of the upper and lower edges. The detachable engagement blocks 17 are respectively fixed.

The frame 12 includes a pair of right and left columns 1.
9 and 19, and a prismatic connecting bar 20 spanned between the columns 19, 19, and the upper and lower sides of the column 19 pivotally support the left and right sides of the board body 11 at the upper position of the columns 19. It is provided as possible.

As shown in FIGS. 3 and 4, the lock device 13 includes a base 23 fixed to the connecting bar 20 via a screw 22, and a base 23 covering the base 23 from above. A board holder 25 connected to the base holder 23 so as to be relatively rotatable; a latch mechanism 26 arranged in the base 23; a switch 27 arranged to receive the latch mechanism 26 therein;
And an operation lever 28 connected to the control lever 5. Here, the lock devices 13 are arranged at two positions on the left and right of the connecting bar 20, but these lock devices 13 are substantially identical to each other, except that the assembling positions of some components are symmetrical. The structure is adopted. Therefore,
In the following, the lock device 1 arranged on the right side in FIG.
3 will be described.

As shown in FIG. 5, the base 23 has a plate-shaped main body 30 which is seated on the connecting bar 20.
And a pair of bearing blocks 31, 31 which are bifurcated from the front end side of the main body 30 and hang down and are located on the front end side of the connecting bar 20, and on the side opposite to the position where the bearing block 31 is provided A pair of upright connecting portions 33 erected in an inclined direction from the upper surface of the main body portion 30;
A connecting piece 34 projecting from both left and right ends in a substantially horizontal direction and having an insertion hole 34A for the screw 22 and an arrangement area of the latch mechanism 26 and the switch 27 And a receiving portion 36 to be formed. The bearing block 31 has a hole 31A through which a common shaft 38 extending between the bearing block 31 and the bearing block of the lock device 13 located on the left side in FIG. 1 is formed. here,
The hole 31 </ b> A has its inner peripheral surface partially
The hole is provided so as to have a small contact area with the common shaft 38, and allows the common shaft 38 to smoothly rotate in the circumferential direction in the hole 31A as described later.

The upright connecting portion 33 has a hole 33A at an axial position substantially parallel to the common shaft 38. These holes 33A are combined on the same axis with the bearing cylinder 40 (see FIG. 3) formed in the board holder 25, and in this state, the pin 41 is inserted to allow the base 23 and the board holder 2 to be inserted.
5 are connected so as to be able to rotate relative to each other.

As shown in FIGS. 4 and 6, the latch mechanism 26 includes a hook member 45 provided with a downward claw 43 on one side surface of the upper end, and the hook member 45 is formed at the lower end. Insert the pin 47 into the hole 46, and
The upper end is rotatable by supporting both ends of bearings 49 (see FIG. 5) formed at two places on the upper surface of the main body 30 in the receiving portion 36. In the hook member 45, the downward claw portion 43 can be engaged with and disengaged from a step portion 51 which faces a square hole 50 formed in a concave receiving surface 48 at the center of the top of the board holder 25. At this time, the hook member 45 is provided such that the downward claw portion 43 is normally biased toward the step portion 51 by the bent piece-shaped leaf spring piece 54 supported by the switch 27. A protrusion 55 is formed on the side end of the hook member 45 to engage with the inside of the switch 27.

As shown in FIG. 5, the receiving portion 36 has opposing side walls 57, 57, and an end wall 58 extending between the rear ends of the side walls 57, and has a substantially U-shape in top view. It is formed in a shape. Grooves 59, 59 and slot holes 60, 60 extending in the up-down direction are formed on each inner surface side of the side wall 57, and the ridges projecting from the skirt portion 61 of the switch 27 in these grooves 59, 60. The ribs 62 and the projections 63 are respectively received, and the switch 27 is supported so as to be able to move up and down. A projection 64 is provided at the center of the rear end of the switch 27 in FIG.
8 is received in the groove 65 formed.

The switch 27 is, as shown in FIG.
The upper end is formed of a downward-opening member having a dome-shaped portion. A wedge-shaped projection 66 is formed on the inner surface side of the skirt portion 61 at a relative position.
These projections 66 are provided so as to be engageable with the projections 55 provided at both ends of the hook member 45, and
When the position of the hook member 6 is lowered, the upper end side of the hook member 45 acts to be pulled into the switch 27, and the downward claw 43 of the hook member 45 is pushed against the biasing force of the leaf spring piece 54 so that the step portion 5 is moved.
It is designed to be separated from 1. On the other hand, the projection 66
Is raised, the protrusion 66 is elastically deformed rearward, and the position where the hook member 45 is engaged with the step portion 51 is maintained. Also,
The rear upper wall 67 of the switch 27 is provided with a hanging cylinder 68 having an opening at the lower end, and a slit 69 is formed at a front portion thereof. The pressing piece 54B of the leaf spring piece 54 comes into contact with the rear end face of the hook member 45 to urge the hook member 45.

In the base 23, spring receiving projections 70, 71 are provided on the upper surface of the main body 30, and these spring receiving projections 70, 71 are provided with coil springs 73, 74.
(See FIGS. 4 and 5). At this time, the upper end of the coil spring 73 contacts the inner surface of the board holder 25 to urge the free end side of the board holder 25 upward, while the coil spring 74 is housed in the hanging cylinder 68. Switch 27 is urged upward.

As shown in FIGS. 3 and 6, the board holder 25 has an open lower part, and is provided so as to be rotatable in the vertical direction with the front end as a free end centered on the bearing cylinder 40 described above. Have been. The board holder 25 has the receiving surface 48 which is capable of receiving the engaging block 17 of the board main body 11 by dropping the central portion of the top wall 75, and is provided on the left and right side walls 76 on the free end side. A hole 78 formed along an axial direction substantially parallel to the bearing cylinder 40
The operation lever 28 can be integrally connected at the hole 78 portion. Further, a concave portion 79 which opens downward is provided on the inner surface of the free end, and the upper end side of the coil spring 73 is received in the concave portion 79.

As shown in FIG. 7, the operation lever 28 includes an operation portion 81 having a substantially rectangular shape in a top view, and an arm portion 83 connecting the operation portion 81 and the hole 78 of the board holder 25. It is configured. The operating portion 81 has a curved bearing recess 84 at the lower portion on the rear end side, and the bearing recess 84 is located at a position above the bearing recess 84.
A hole 85 reaching the inside is formed. This bearing recess 84
The operation unit 81 is fixed to the common shaft 38 by a screw 87 screwed into the hole 85, and the common shaft 3 is supported by the axis position of the common shaft 38 as a fulcrum.
8 and rotatably provided. Also, the bearing recess 8
7, a support hole 8 for the arm portion 83 is located at a position on the near side in FIG.
8 are formed.

The arm portion 83 includes a stepped horizontal shaft portion 89 received in the support hole 88 and an upright shaft portion 90 hingedly connected to one end of the horizontal shaft portion 89. A shaft 91 having a cross-shaped cross section protruding from the upper end side is inserted into the hole 78 of the board holder 25, whereby the operation lever 28 and the board holder 25 are interconnected.

As shown in FIG. 8, the engaging block 17 comprises a receiving body 17A mounted on the board body 11 and a receiving 17B which can be screwed and fixed to the receiving body 17A. The receiving tool 17B is the receiving tool body 1
The degree of engagement with the receiving surface 48 can be adjusted by advancing and retracting the screwing position into the 7A, thereby making it possible to easily cope with manufacturing errors and assembly errors of parts. The receiving body 17A and the receiving body 17B are provided in a shape that allows relative rotation, and a projection and a groove (not shown) are formed between them.
At a position where the receiving tool 17B substantially coincides with the extending direction of the outer edge of the board body 11, the receiving tool 17B can be stopped in the receiving tool body 17B by a click operation. Also, in FIG.
Reference numeral 5 denotes a powder receiving tray, and the tray 95 is mounted on an outer cover 96 located around each lock device 13.

Next, the operation of the lock device 13 according to the present embodiment will be described with reference to FIGS.

Now, when the board holder 25 is moved up to the first position,
It is assumed that the engagement block 17 of the board main body 11 is located on the receiving surface 48 and the board main body 11 is kept in a substantially vertical posture and cannot be rotated. Here, when rotating the board main body 11, first, the operating portion 81 of the operating lever 28 may be pressed from above to apply a rotating force downward.

Then, the operation lever 28 is connected to the common shaft 3
The rotation is performed with eight positions as fulcrums, and at the same time, the axial position of the horizontal shaft 89 of the arm 83 is lowered. Thereby, the shaft 9 provided at the upper end of the arm portion 83
1 is connected to the free end side of the board holder 25, the board holder 25 rotates downward with the position of the pin 41 as a fulcrum.

When the board holder 25 rotates in this manner, the position of the step 51 of the board holder 25 is lowered, and the hook member 4 of the latch mechanism 26 is attached to the step 51.
5 is engaged with the downward claw portion 43,
The engaged position is set as the second position and the board holder 25
Is regulated. By operating one of the two lock devices 13 described above, such an action can be applied to one of the other lock devices 13 via the common shaft 38. Is allowed to rotate.

In the state where the receiving surface 48 is lowered, FIG.
As shown in FIG.
By the urging force of No. 4, the whole is pushed upward, and the dome-shaped portion at the upper end is projected. At this time, the projection 66 passes through the position of the projection 55, but the projection 66 is elastically deformed in the retreating direction, so that the engagement state between the step portion 51 and the downward claw portion 43 is maintained. Then, when the board body 11 has been rotated approximately 180 degrees from the position in FIG.
The engagement block 17 fixed to the board body 11 comes into contact with the switch 27.

When the engagement block 17 comes into contact with the switch 27 in this manner, the contact force acts as a pressing force of the switch 27, and the switch 27 descends. When the switch 27 is lowered, the wedge-shaped projection 66 formed on the inner surface of the switch 27
5, the position of the projection 55 is displaced rearward, and the engagement between the hook member 45 and the step portion 51 is released.

Then, the board holder 25 is pushed upward by the urging force of the coil spring 73 disposed at the inner surface position on the free end side, and the board holder 25 is moved to the first position.
And the operating portion 81 of the operating lever 28 is returned to a substantially horizontal posture.
The engagement block 17 on the side is received in the receiving surface 48, and the rotation of the board body 11 is regulated while maintaining the board body 11 in the substantially vertical posture again.

Thereafter, by the same operation, the rotation of the board main body 11 and the rotation control can be performed as required.

In the above embodiment, the board main body 11 is constituted by a white board. However, the present invention is not limited to this, and may be used for posting various documents such as public information and advertisement. The same applies to a board having a bulletin board.

Although the lock devices 13 are arranged at two positions, at least one lock device may be arranged, and three or more lock devices may be arranged as necessary. Further, the position of the lock device 13 is not limited to the case along the lower outer edge of the board body 11 but also includes the case along the left or right side edge. The outer edge portion in the present invention is used as a concept including the engagement block 17. Further, the locking device 1
3 denotes a pin protruding from the base 23 and the board body 11.
May be constituted by a hole provided in the outer edge portion of.

[0035]

As described above, according to the present invention,
When the board body is rotated by the action of the latch mechanism, the posture is controlled between the first position at which the board holder is engaged with the board body and the second position at which the engagement is released. In addition, there is no need to continue the operation for maintaining the board holder at the second position, and the board body can be rotated with both hands. Further, when the outer edge portion of the board body comes into the engagement position with the board holder again by the rotation, frictional contact does not occur between the two and the board body and the board holder have a predetermined relative positional relationship. The board holder returns to the first position and holds the board when the condition becomes true, so that the load caused by the operation does not occur, and the cause of the conventional rattling is effectively avoided. It becomes possible.

Further, since a receiving surface is provided on the board holder and a switch which can be pressed by the outer edge portion of the board main body is disposed in the receiving surface area, the rotation operation can be performed only by the contact of the main body with the switch. The re-engagement with the board body can be achieved, and the rotation operation can be performed smoothly.

Further, the operation lever is integrally connected to the board holder, and the board holder is displaceably provided at the second position by the rotation of the operation lever. Therefore, there is no loss in the transmission of the force of the operation lever, and the operation of displacing the board holder can be easily performed.

Further, when a plurality of lock devices are provided, a common shaft is passed through each lock device to enable the synchronous rotation of the board holder. Therefore, only one of the lock devices is operated to operate one of the lock devices. An operating force can be applied to the locking device, and the operation can be performed without burden because the operation for each locking device is unnecessary.

[Brief description of the drawings]

FIG. 1 is a front view of a rotating blackboard to which the present invention is applied.

FIG. 2 is a right side view of FIG.

FIG. 3 is a schematic perspective view of a lock device according to the embodiment.

FIG. 4 is an exploded perspective view of FIG. 3;

FIG. 5 is a perspective view showing a base constituting the lock device.

FIG. 6 is an exploded perspective view of a base support, a latch mechanism, and a switch constituting the lock device.

FIG. 7 is an exploded perspective view showing an operation lever of the lock device.

FIG. 8 is a partial cross-sectional side view showing an engagement state between the lock device and the rotating board.

FIG. 9 is a partial cross-sectional side view in which the engagement between the lock device and the rotating board is released.

[Explanation of symbols]

 Reference Signs List 10 rotating blackboard (rotating board) 11 board body 12 frame 13 locking device 23 base 25 board holder 26 latch mechanism 27 switch 28 operating lever 38 common shaft 48 receiving surface

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiromasa Tanaka 184-1, Maioka-cho, Totsuka-ku, Yokohama-shi Nifco Co., Ltd. (72) Inventor Yasuhiko Ikeda 184, Maioka-cho, Totsuka-ku, Yokohama-shi Nifco, Inc.

Claims (4)

[Claims] 1. A board mounted on a frame rotatably supporting a board body provided with a writing surface or a posting surface, and engaged with an outer edge portion of the board body to restrict the rotation of the board body, and In a posture control device for a rotating board provided with a locking device for releasing the engagement and allowing the rotation of the board body, the locking device includes a base fixed to the frame and a first position engaged with the outer edge portion. And a board holder displaceable to a second position for releasing engagement with the outer edge portion, and a latch provided on the base and for maintaining the position when the board holder is displaced to the second position And a switch for releasing the latch mechanism and returning the board holder to the first position when the outer edge portion enters the engagement position with the board holder. Locking device for a rotary board characterized by. 2. The board holder has a receiving surface capable of receiving the outer edge portion, and the switch is arranged to be able to move up and down within the receiving surface region so that the switch is pressed by the outer edge portion. The locking device for a rotating board according to claim 1, wherein 3. An operation lever is integrally connected to the board holder, and the board holder is displaceably provided at a second position by rotation of the operation lever. Or the lock device for a rotating board according to 2. 4. The lock device is provided at a plurality of locations on the same line along the outer edge of the board body, and the board holder is provided so as to be synchronously rotatable via a common shaft passing through each of the lock devices. Claim 1, characterized in that
4. The attitude control device for a rotating board according to 2 or 3.