JP3783441B2 - Rotating blackboard - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating blackboard having a lock function for prohibiting rotation of a blackboard body at a use position.
[0002]
[Prior art]
A rotating blackboard is one that can be used by reversing the front and back sides of the blackboard body, usually a pair of leg posts that are provided on both sides of the blackboard body to pivotally support the blackboard body, and to stand upright. And a lock mechanism that prohibits rotation of the blackboard body at the position.
As a lock mechanism that has been used in the past, for example, it is composed of a rubber material adhered to the inner surface of one leg strut, and a grip provided to advance and retract by screwing a pin from the inner surface of the other leg strut Is known. These rubber materials and pins are provided at a position corresponding to the lower end of the side surface at the use position of the blackboard body, and the other is obtained by rotating the grip at the use position to project the pin and pressing one side surface of the blackboard body. The side surface of the blackboard is pressed against the rubber material, and the rotation of the blackboard body is prohibited by the friction between the side surface and the rubber material.
[0003]
[Problems to be solved by the invention]
However, this requires an operation of rotating the grip both when locked and unlocked, and particularly when locking, it requires an operation of turning the grip and tightening the pin with a considerably strong force. Therefore, for example, it is difficult for people with disabilities, women and elderly people to operate, and it is difficult to judge how much the pin will be locked if the blackboard body is locked. The certainty of prohibiting the rotation is low, such as the blackboard body may rotate after the lock is released.
[0004]
On the other hand, an engagement member having an engagement recess at the tip thereof is provided at both ends of the upper surface of the horizontal member connecting the left and right leg columns so as to be movable up and down. Some lock the blackboard body by engaging it.
As a mechanism for moving the engagement member up and down, a mechanism that slides up and down via a slide mechanism constituted by a rail member or the like, or a base end that is pivotally attached to a horizontal member and along the thickness direction of the blackboard body The thing etc. which have arrange | positioned the engaging member to the rotation end of the rotation arm rotated in a virtual surface can be considered.
[0005]
However, the slide mechanism such as the former has a problem in terms of durability, such as a member that frequently moves the engaging member up and down, such as a rotating blackboard, that the member wears heavily. On the other hand, in the case of the latter rotating arm, when the vertical movement of the rotating arm is moved closer to the vertical direction in order to make the engagement between the blackboard body and the engaging member smooth, the rotating arm becomes thicker than the blackboard body. There is a risk of jumping in the direction and becoming bulky.
[0006]
[Means for Solving the Problems]
In order to solve such a problem, the rotating blackboard of the present invention extends the rotating arm constituting the locking mechanism along the surface direction of the blackboard body, and rotates in a virtual plane along the surface direction. It is supposed to be.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
That is, the rotating blackboard of the present invention comprises a rotatable blackboard body that can be used on both sides by being inverted, a support that rotatably supports the blackboard body, and a lower edge of the blackboard body in a use position. A lock mechanism that prohibits the rotation of the blackboard body by disengaging the blackboard body by operating a powder receiver that receives powder falling from the blackboard body as an operating portion. The lock mechanism is pivotally attached to a part of the support so that the base end thereof is pivotally supported and extends from the base end along the surface direction of the blackboard body. A pivot arm that pivots up and down in a virtual plane along the direction, and engages with the blackboard body provided at the pivot end of the pivot arm, and the front and rear end portions of the upper surface are substantially chevron-shaped, , Towards the thickness direction center of the blackboard body An engagement portion having a tapered surface that is tapered next, and the blackboard body has a tapered surface that gradually decreases toward the tip at the upper and lower edges of the frame member. It is characterized by being.
[0008]
With such a configuration, it becomes possible to freely set the length of the rotating arm while preventing the blackboard body from jumping out in the thickness direction, and in particular, the raising and lowering of the engaging portion is brought closer to the vertical direction. Even if the rotating arm is set as long as possible, the rotating arm is accommodated within the thickness of the blackboard body, and the appearance of the blackboard body and the engaging portion are smoothly engaged while the appearance is good. It becomes possible to do. Moreover, normally, in the rotating blackboard having the above-described configuration, the blackboard body rotates in a virtual plane along the thickness direction, so that the rotation direction of the blackboard body and the rotation direction of the engaging portion are orthogonal to each other. Therefore, even if the blackboard body approaches the engagement portion from either the forward or reverse rotation direction, the engagement operation between the engagement portion and the blackboard body is performed in the same manner. It becomes easy to set the same in both forward and reverse directions of the blackboard body. In addition, the rotating arm can smoothly move up and down, and has an advantage that the member has less wear and higher durability than a slide mechanism, for example.
[0009]
Further, as a specific configuration of the lock mechanism, an urging member that urges the rotating arm upward, and an engaged portion that is provided on the upper and lower edges of the blackboard body and engages with the engaging portion. What is provided can be mentioned.
In order to increase the locking reliability, it is desirable to provide a pair of locking mechanisms at both ends in the width direction of the blackboard body.
[0010]
Further, when the lock mechanism is provided as a pair at both ends in the width direction of the blackboard body, the operation unit may be operated in conjunction with the rotation of the rotation arm of the pair of lock mechanisms. desirable.
[0011]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the rotating blackboard A includes a rotatable blackboard body 1 that can be used on both sides by being inverted, and a leg 2 that is a support body that rotatably supports the blackboard body 1. A movable powder receiver 4 that receives powder falling from the blackboard main body 1 and the powder receiver 4 as an operating portion engages with the blackboard main body 1 in a use position to prohibit its rotation and operate the powder receiver 4 Thus, the lock mechanism 5 that releases the engagement and allows the blackboard body 1 to rotate is provided.
[0012]
The blackboard body 1 includes a writing board 1a and a frame member 1b, and is pivotally supported by the leg 2 in the vicinity of the center of both left and right side surfaces thereof. Here, the writing board 1a indicates a white board for writing with a water-based pen or the like, or a chalk board for writing with a chalk or the like. The frame material 1b is provided around the writing plate 1a.
[0013]
The legs 2 are formed to connect a pair of square-pipe columns 2a provided on both sides of the blackboard body 1, a base 2b that supports the lower end of the column 2a, and a pair of columns 2a. And a horizontal member 2d disposed below the blackboard body 1. The support 2a rotatably supports the central portion in the vertical direction of the blackboard body 1 via a pin 15 provided at the upper end portion thereof. The base 2b is made of a square pipe, like the support 2a, and is arranged in the front-rear direction. A caster 2c is provided on the lower surface of the base 2b to make the blackboard body 1 movable. The horizontal member 2d is made of a square pipe that is horizontally placed between the left and right columns 2a at a position where the blackboard body 1 does not interfere when the blackboard body 1 rotates.
[0014]
As shown in FIGS. 1 to 3, the powder receiver 4 is pivotally supported by the horizontal member 2 d via a pair of powder receiver hinge portions 7 disposed in the vicinity of both left and right ends thereof. The blackboard body 1 is disposed over almost the entire length in the width direction. The powder receiver 4 is formed by bending a sheet metal or the like, and is disposed substantially horizontally with respect to the floor surface F at the use position, and receives a powder or pen that falls from the writing plate 1a; A front standing portion 4b that stands upright while tilting forward from the front end of the receiving portion 4a, a rear standing portion 4d that stands up while tilting backward from the rear end of the receiving portion 4a, and a rear standing portion 4d. A pressing portion 4c extending in a substantially horizontal direction from the rear end and disposed at a position for pressing the rotating arm 10 described below downward; a pair of substantially U-shaped on the lower surfaces of the left and right ends of the receiving portion 4a; The mold bracket 6 is fixed by appropriate means such as welding. The powder receiving hinge portion 7 protrudes forward from the front wall 7a and the rear wall 7b facing each other, the top wall 7c connecting the upper ends of the front and rear walls 7a and 7b, and the left and right edges of the front wall 7a. The front and rear walls 7a and 7b and the top wall 7c are fitted to the upper part of the horizontal member 2d and fixed by appropriate means such as bolts. And the said powder receiver 4 inserts into the hole 6a drilled in the said bracket 6 by inserting the pin 8 inserted from the hole 7e provided in the right-and-left both-sides wall 7d of the said powder receiver hinge part 7. The receiving hinge 7 is pivotally supported. In addition, in the vicinity of the left and right ends of the powder receiver 4, a notch 4 e is provided from the pressing portion 4 c to the rear standing portion 4 d to allow the engagement member 12 of the lock mechanism 5 described later to move up and down.
[0015]
The lock mechanism 5 uses the powder receiver 4 as an operating portion and engages with the blackboard body 1 in the use position to prohibit its rotation and releases the engagement by operating the powder receiver 4 to release the engagement of the blackboard body. 1, a pair of rotating arms 10 disposed in the vicinity of both left and right ends of the horizontal member 2d and rotating in the vertical direction, and an urging member for urging the rotating arm 10 upward A torsion coil spring 11, an engaging convex portion 9 that is an engaged portion provided at the upper and lower edges of the blackboard body 1, and a rotating end of the rotating arm 10 that engages with the engaging convex portion 9. The engaging member 12 is an engaging portion.
[0016]
The rotating arm 10 has opposing side walls 10a and a top wall 10b disposed on the upper surface of the top wall 7c of the powder receiving hinge 7 and below the pressing portion 4c of the powder receiving 4 and opens downward. A U-shaped member having a base end 10c opened upward on the top wall 7c of the powder receiving hinge portion 7 and attached to the U-shaped member 13 attached by an appropriate means so as to be rotatable. is doing. Specifically, the pivot arm 10 is pivotally attached to the U-shaped member 13 via a shaft 14 having a base end 10c horizontally disposed in the front-rear direction, so that the base end 10c is supported. The tip 10d extending along the surface direction of the blackboard main body 1 is set as a rotation end that can be rotated in a vertical direction within a virtual plane along the surface direction of the blackboard main body 1, and the top surface of the rotation end is The engaging member 12 is attached.
[0017]
The torsion coil spring 11 is wound around a shaft 14 inserted through a hole 10e formed in the side wall 10a of the rotating arm 10 in order to perform a function commonly called a kick spring. The portion 11a is brought into contact with the lower surface of the top wall 10b of the rotating arm 10 and the other end portion 11b is brought into contact with the upper surface of the bottom wall 13a of the U-shaped member 13 to elastically bias the rotating arm 10 upward. It is configured as follows.
[0018]
The engaging member 12 has a substantially rectangular parallelepiped shape, and is provided at the center of the upper surface and is engaged with the engaging concave portion 12a that engages with the engaging convex portion 9, and protrudes from the lower side of the left and right sides toward the left and right sides. And a pressed part 12b. Note that the front and rear end portions of the upper surface of the engagement member 12 have a substantially chevron shape, that is, a tapered surface 12c that gradually tapers toward the center of the blackboard body 1 in the thickness direction.
[0019]
The engaging projections 9 are provided at the upper and lower edges of the frame member 1b of the blackboard body 1 described above, and the taper surface 9a that gradually decreases toward the tip, and the taper surface 9a continuously in the vertical direction. It comprises a projecting body 9b that hangs down.
That is, the lock mechanism 5 engages the engagement convex portion 9 of the blackboard body 1 in the use position with the engagement concave portion 12a of the engagement member 12 to prohibit the rotation of the blackboard body 1 and rotate the blackboard body 1. In this case, the powder receiver 4 is rotated upward, and the pressed portion 12b of the engaging member 12 is pressed by the pressing portion 4c, whereby the rotating arm 10 is rotated downward, and the engaging convex portion 9 and The engagement with the engagement recess 12a is released.
[0020]
Next, the operation method of the rotating blackboard 1 will be described in detail.
As shown in the solid line in FIG. 4 and FIG. 5, the blackboard body 1 is prohibited from rotating when the engagement convex portion 9 of the blackboard body 1 and the engagement concave portion 12 a of the engagement member 12 are engaged in the use position. Has been. When the use surface of the blackboard body 1 is reversed, the user holds the powder receiver 4 and rotates it so as to lift it upward. Since the powder receiver 4 rotates clockwise through the powder receiver hinge portion 7, the pressing portion 4c disposed on the rear end side of the powder receiver 4 is lowered as shown by an imaginary line in FIG. To do. At this time, since the lower surface of the pressing portion 4c of the powder receiver 4 presses the pressed portion 12b of the engaging member 12, the tip 10d of the rotating arm 10 descends as shown in the phantom line in FIG. 4 and FIG. Thus, the engagement between the engagement recess 12a and the engagement protrusion 9 is released, and the blackboard body 1 is allowed to rotate. After the engagement concave portion 12a and the engagement convex portion 9 are disengaged, the rotating arm 10 is biased upward by the torsion coil spring 11, so that the tip 10d rotates upward, and accordingly. Thus, the pressed part 12b presses the lower surface of the pressing part 4c of the powder receiver 4, and the powder receiver 4 rotates counterclockwise as viewed from the side. When the lower surface of the receiving portion 4a comes into contact with the upper surface of the side wall 7d of the powder receiving hinge portion 7, further rotation is prohibited and the powder receiving device 4 is held in the use position.
[0021]
On the other hand, when the inverted blackboard body 1 is held in the use position again, the engagement convex portion 9 that is located on the lower edge side of the blackboard main body 1 after the reverse is replaced with the engagement concave portion 12a of the engagement member 12. When the taper surface 9a of the engagement recess 9 and the taper surface 12c of the engagement member 12 are brought into contact with each other from the front or the rear, the engagement recess 12a is moved back to its original position after being gradually retracted. It will automatically engage with the engaging projection 9 that has returned and arrived at that position.
[0022]
With such a configuration, the rotating arm 10 extends along the surface direction of the blackboard body 1 and rotates in a virtual plane along the surface direction. It can be accommodated within the thickness of the horizontal member 2d without jumping out to the outside, and even if the length of the rotating arm 10 is taken a predetermined distance, no place can be taken. In addition, since the length of the rotating arm 10 can be set at a predetermined distance in this way, it is easy to bring the engaging member 12 up and down closer to the vertical direction. Moreover, since this does not displace the engagement member 12 in the front-rear direction, the engagement between the engagement member 12 and the blackboard main body 1 regardless of whether the blackboard main body 1 approaches the engagement member 12 from the front or the rear. The joint operation is performed in the same manner, and it becomes easy to set the engagement condition of the engagement member 12 and the blackboard body 1 to be the same in both the forward and reverse rotation directions of the blackboard body 1.
[0023]
Furthermore, in the present embodiment, the powder receiver 4 also serves as the operation portion of the lock mechanism 5, so that it is not necessary to separately configure special operation means, and the number of parts is reduced and the cost is reduced. An appropriate lock function can be secured with a simple configuration. In addition, the lever mechanism and grip are not required, and the design can be simplified. Further, normally, the powder receiver 4 is provided over almost the entire length between the left and right legs, so that a separate interlocking mechanism is provided even if the engaging member 12 is disposed at a position separated from the left and right. In addition, it can be properly interlocked by the powder receiver 4 and can be operated from any position in the width direction.
[0024]
The lock mechanism 5 includes a pivot arm 10 that pivots in the vertical direction, a torsion coil spring 11 that urges the pivot arm 10 upward, and a latch provided at the pivot end of the pivot arm 10. Since the combination member 12 and the engagement convex portion 9 provided on the upper and lower edges of the blackboard body 1 and engaged with the engagement member 12 are provided, the operability is improved with a simple configuration. Can do.
[0025]
The specific configuration of each unit is not limited to the above-described embodiment. For example, the operation unit for operating the rotating arm 10 is not limited to the above-described powder receiver 4, and the base end 10 c side of the rotating arm 10 is required to directly operate the rotating arm 10 as shown in FIG. 7. Needless to say, the operating lever 15 may be integrally provided by extending outward. Furthermore, the engaging portion may be a pin-shaped member, and the engaged portion may be a hole-shaped member that receives it. Other configurations can be variously modified without departing from the spirit of the present invention.
[0026]
【The invention's effect】
The present invention is implemented in the form as described above and has the following effects.
That is, the rotating blackboard of the present invention comprises a rotatable blackboard body that can be used on both sides by being inverted, a support that rotatably supports the blackboard body, and a lower edge of the blackboard body in a use position. A lock mechanism that prohibits the rotation of the blackboard body by disengaging the blackboard body by operating a powder receiver that receives powder falling from the blackboard body as an operating portion. The lock mechanism is pivotally attached to a part of the support so that the base end thereof is pivotally supported and extends from the base end along the surface direction of the blackboard body. A pivot arm that pivots up and down in a virtual plane along the direction, and engages with the blackboard body provided at the pivot end of the pivot arm, and the front and rear end portions of the upper surface are substantially chevron-shaped, , Towards the thickness direction center of the blackboard body An engagement portion having a tapered surface that is tapered next, and the blackboard body has a tapered surface that gradually decreases toward the tip at the upper and lower edges of the frame member. Therefore, the rotating arm can be accommodated within the thickness of the blackboard body without projecting to the outside, the appearance is improved, and the length of the rotating arm is set at a predetermined distance. However, it can be a place that does not take up space. In particular, it is possible to accommodate the rotating arm within the thickness of the blackboard body even if the rotating arm is set to be long in order to bring the engaging part up and down in the vertical direction, and the appearance is good, The engaging operation between the blackboard body and the engaging portion can also be made smooth. In addition, according to the configuration of the present application, even if the blackboard body approaches the engagement portion from either the forward or reverse rotation direction, the engagement operation between the engagement portion and the blackboard body is performed in the same manner. It is easy to set the same engagement condition in both the forward and reverse rotation directions of the blackboard body. In addition, the rotating arm can smoothly move up and down, and has an advantage that the member has less wear and higher durability than a slide mechanism, for example.
[0027]
If the lock mechanism includes an urging member that urges the rotating arm upward, and an engaged portion that is provided on the upper and lower edges of the blackboard body and engages with the engaging portion. Thus, the operability of the lock mechanism can be improved with a simple configuration.
If the lock mechanism is provided as a pair at both ends in the width direction of the blackboard body, the certainty of the lock can be improved.
[0028]
In particular, when the lock mechanism is provided as a pair at both ends in the width direction of the blackboard body, the operation unit can be operated in conjunction with the rotation of the rotation arm of the pair of lock mechanisms. For example, the lock mechanisms at both ends in the width direction can be operated at once, and the lock operation is particularly good.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an embodiment of the present invention.
FIG. 2 is a perspective view showing the main part.
FIG. 3 is an exploded perspective view showing the main part.
FIG. 4 is an explanatory diagram of the operation.
FIG. 5 is an explanatory diagram of the operation.
FIG. 6 is an explanatory diagram of the operation.
FIG. 7 is a schematic diagram showing a modification of the present invention.
[Explanation of symbols]
A ... Rotating blackboard 1 ... Blackboard body 2 ... Support (leg)
4 ... Operation part (powder holder)
5 ... Lock mechanism 9 ... Engagement part (engagement convex part)
10 ... Rotating arm 11 ... Biasing member (torsion coil spring)
12 ... engaging part (engaging member)

Claims (4)

A rotatable blackboard body that can be used on both sides by reversing, a support body that rotatably supports the blackboard body, and a lower edge of the blackboard body that is in a use position to prevent rotation of the blackboard body. And a lock mechanism that releases the engagement by operating a powder catcher that receives powder falling from the blackboard body as an operating portion and allows the blackboard body to rotate. An end that is pivotally attached to a part of the support body and pivoted from the base end along the surface direction of the blackboard body is vertically moved in a virtual plane along the surface direction of the blackboard body. A pivot arm that pivots in a direction, and is provided at the pivot end of the pivot arm to engage with the blackboard body, and the front and rear end portions of the upper surface face a substantially chevron shape, that is, toward the thickness direction center of the blackboard body. Taper taper A rotating blackboard characterized in that the blackboard body has a tapered surface that gradually narrows toward the front end at the upper and lower edges of the frame member. . The lock mechanism includes an urging member that urges the rotating arm upward, and an engaged portion that is provided on the upper and lower edges of the blackboard body and engages with the engaging portion. The rotating blackboard according to claim 1. The rotating blackboard according to claim 1 or 2, wherein the lock mechanism is provided in pairs at both ends in the width direction of the blackboard body. 4. The rotating blackboard according to claim 3, wherein the operating section can be operated in conjunction with the rotation of the rotating arms of the pair of lock mechanisms.

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