JP2600599B2 - Rotating blackboard fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for fixing a rotating blackboard pivotally supported around a horizontal axis.

[0002]

2. Description of the Related Art In general, a rotating chalkboard forms a support by connecting a pair of columns with beams, and is pivotally supported between the columns of the support via a horizontal axis. Then, the desired surface is positioned on the front side by appropriately reversing the horizontal axis as a fulcrum,
After the rotating blackboard is fixed by a fixing device, the surface is utilized using a marker, chalk, or the like.

[0003]

[SUMMARY OF THE INVENTION Incidentally, the conventional fixing device, as shown in FIG. 19, the nut member b fixedly between the outer wall a ₁ and the inner wall a ₂ posts a, the nut member b together keep the threaded portion d of the insertion grip c from the outer wall a ₁ allowed movably screwed, pivotally mounted a stopper f rotatably via an arm e on an inner wall a ₂ of the strut a, the grip c And press the rear end of the stopper f with the front end,
As a result, the stopper f is brought into contact with and fixed to the outer surface of the side frame h of the rotating blackboard g.

However, in such a configuration, the stopper f moves around the pivot point e ₁ of the arm e to rotate the blackboard g.
The side frame h from the oblique direction.
For this reason, it is difficult to apply a sufficient holding force to the rotating blackboard g, and the blackboard g is likely to be inadvertently rotated during use. Therefore, conventionally, the grip c is tightened with a very large operating force, and the entire support base including the beam i and the pillars a on both sides is deformed into a parallelogram by the reaction force whose tip abuts the blackboard g. In many cases, an improper usage mode is adopted in which a support a (not shown) on the opposite side is forcibly brought into contact with the side frame h of the rotating blackboard g to increase the holding force on the rotating blackboard g.

Therefore, in recent years, a stopper is fitted in a hole provided in the inner wall of the column so that the stopper is movable in the horizontal axis direction and cannot rotate, and the tip of the grip is fitted to the stopper. A configuration in which the engagement is performed is also considered. If such a configuration is adopted, at least the stopper abuts vertically on the outer surface of the side frame of the rotating blackboard,
A large friction area is secured, and an effective holding force can be applied.

However, even with such a configuration, the grip is screwed forward and backward, so that the operability is poor, and the shaft protrudes and retracts from the hole, so that the operation resistance increases due to the entanglement of fingers and clothes and adhesion of dust and the like. There is a problem that such inconveniences are easily caused.
Further, since the nut must be welded to the inside of the support, there is a problem that the production is complicated and the cost is easily increased. Such a problem can be similarly applied to the conventional one shown in FIG.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and is capable of applying an appropriate holding force to a rotating blackboard, has good operability, and is simple to manufacture. It is an object of the present invention to provide a practically useful fixing device for a rotating blackboard.

[0008]

In order to achieve the above object, the present invention employs the following configuration.

In other words, the rotating blackboard fixing device according to the present invention provides a rotating blackboard pivotally supported via a horizontal axis between columns that are connected to each other in a vertical posture via a beam.
An operating body which is rotatably fitted in a hole provided in an outer wall of at least one of the columns and is formed so as to be immovable in the horizontal axis direction and has a grip formed at a base end; An actuating body which is fitted movably in the axial direction and has a stopper formed at the tip thereof, which is vertically opposed to the outer surface of the side frame of the rotating blackboard, wherein the base end of the actuating body is screwed to the tip of the operating body. It is characterized by being connected so that it can enter and retreat.

When the rotating blackboard is to be fixed from the left and right, such a fixing device does not need to be provided in a pair of right and left. As an embodiment, the side of the rotating blackboard which is located on the inner wall of the other column and corresponding to the stopper is provided. It is effective to dispose a fixed stopper facing the outer surface of the frame.

In order to mount the operating body so as to be rotatable and immovable in the horizontal axis direction, a concave groove is provided on the outer periphery of the operating body, and the concave groove is provided in the concave groove at the tip of a plate fixed to the outer surface of the outer wall of the column. It is convenient to engage with.

In order to easily form a groove in the operating body,
It is effective that the operating body has a configuration in which the grip is connected to a spindle portion on the distal end side of the grip, and the concave groove is formed in a gap between the grip and the spindle portion.

In order to mount the operating body so as to be non-rotatable and free to move in the horizontal axis direction, the outer periphery of the operating body and the hole in the inner wall of the column must have a polygonal shape that fits tightly with each other. Becomes effective.

In order to connect the distal end of the operating body and the proximal end of the operating body so that they can be screwed forward and backward, a male screw is formed at the distal end of the operating body, and a female screw engaged with the male screw is provided at the proximal end of the operating body. An embodiment in which a female screw is formed at the distal end of the operating body and a male screw that is screwed into the female screw at the base end of the operating body may be considered.

[0015]

With such a construction, when the grip is gripped and rotated, the operating body rotates at the same axial position, and the operating body screwed to the tip of the operating body is Due to the screw feed action, the stopper moves forward and backward in the horizontal axis direction, so that the stopper is vertically moved toward and away from the outer surface of the side frame of the rotating blackboard. That is, in the present invention, the grip only rotates at the same axis position, does not perform the reciprocating operation in the axial direction, and furthermore, the stopper abuts perpendicularly to the rotating blackboard to provide an effective holding force. Can act. Therefore, the operability is improved, and the rotating blackboard can be effectively fixed with a relatively small operation force. In addition, since the support shaft does not protrude and retract with respect to the hole, fingers or clothes may be caught, and dust or the like may enter. An increase in operation resistance can be prevented.

In the case where the fixed stopper is disposed at a position corresponding to the stopper, the fixed stopper and the outer surface of the side frame of the rotating blackboard are caused by a reaction force when the stopper comes into contact with the outer surface of the side frame of the rotating blackboard by the grip operation. In this case, the fixed stopper comes into contact with the rotating blackboard, so that the rotating blackboard can be fixed from the left and right with a simple configuration. In addition, if the operating body is composed of a grip and a spindle, and the grip and the spindle are connected so as to be sandwiched from inside and outside through holes provided in the outer wall of the column, the operating body can be connected without welding. It can be easily attached to a support.

Also, when a concave groove is provided on the outer periphery of the operating body and the tip of a plate fixed to the outer surface of the outer wall of the column is engaged with the concave groove, welding to the inside of the column is also possible. Work is not required, and assembly is significantly simplified. In this case, even if the plate is attached to the support, only the thickness corresponding to the thickness of the plate protrudes from the support, so that the plate does not become bulky.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

The rotating blackboard 2 to which the fixing device 1 of this embodiment is applied is, as shown in FIGS. 1 to 3, pivotally supported by an H-shaped support base 3 as viewed from the front. The support 3 is configured such that the columns 31 standing vertically are connected to each other via a beam 32, and a leg 33 is attached to the lower end of the column 31, and a powder receiver 34 is provided above the beam 32. It is erected.

The rotating blackboard 2 has a width slightly smaller than the width of the columns 31. The four sides of the face plate 21 are reinforced by an upper frame 22, a lower frame 23 and left and right side frames 24. Then, the rotating blackboard 2 is mounted on the support 31 of the support 3.
The intermediate position of the left and right side frames 24 is rotatably supported by the corresponding columns 31 via a horizontal axis m.

In contrast to the rotating blackboard 2 having such a configuration, the rotating blackboard fixing device 1 according to the present embodiment is, as shown in FIG. 4, a circular hole 3 provided in an outer wall 31a of a right column 31 in a front view.
An operating body 4 that is rotatably fitted to 1b so as to be non-movable in the horizontal axis direction and an octagonal hole 31d provided in the inner wall 31c of the column 31 is non-rotatably fitted to be movable in the horizontal axis direction. And an operating body 5.

More specifically, the operating body 4 is formed by connecting a grip 41 shown in FIGS. 5 to 8 and a spindle 42 shown in FIGS. 9 to 11. The grip 41 has, on the inner surface side, a projection 41a having a hollow outer periphery and a quadrangular shape, and a cylindrical portion 41b surrounding the projection 41a. One of the support shaft portions 42 has a prismatic portion 42a tightly fitted to the inner periphery of the protrusion 41a of the grip 41, a small-diameter flange portion 42b for regulating the fitting depth, and a flange portion 42b. An adjacent large-diameter flange portion 42c is formed, and the flange portion 42c is formed.
A male screw portion 42d is engraved on the distal end side. Then, as shown in FIG. 15, the support shaft 42 is inserted into the inside of the support 31 through the hole 31d of the inner wall 31c, and the large-diameter flange 42c is attached to the inner surface of the outer wall 31a. Then, an adhesive is applied to the prism 42a extending from the hole 31b of the outer wall 31a to the outside of the support 31 to fit the protrusion 41a of the grip 41. In this state, the axial dimension of the small-diameter flange 42b substantially matches the thickness of the support 31.

As shown in FIGS. 12 to 14, the operating body 5 has an octagonal projection 51 formed at the base end thereof.
1, a female screw portion 51a screwed into the male screw portion 42d of the support shaft portion 42 is formed, and a stopper 52 is formed at the tip to be in contact with the side frame 31 of the rotating blackboard 3. The left and right side edges 52a of the stopper 52 are slightly raised from the central portion 52b, and come into contact with the side frame 31 from front and rear.

Then, as shown in FIG. 15, the operating body 5 is positioned at a position facing the hole 31d provided in the inner wall 31c of the column 31, and then the grip 41 of the operating body 4 is moved.
After the female screw portion 51a is screwed into the male screw portion 42d by rotating the screw, the screwing is further deepened, and the projecting portion 51 of the operating body 5 is inserted through the hole 31d through the hole 31d by the screw feeding action at that time. It is fitted in.

As shown in FIG. 1, at the position corresponding to the stopper 52 on the inner wall 31c of the column 31 on the left side as viewed from the front, a fixing member which is in close proximity to the outer surface of the side frame 24 of the rotating blackboard 2 is opposed. A stopper 6 is provided.

With such a configuration, when the grip 41 is gripped and rotated as shown by the arrow A in the figure as shown in FIG. 15, the entire operation body 4 moves forward and backward of the flange 42b. The hole 31 is formed by a certain flange 42c and the cylindrical portion 41b.
The operating body 5 which is rotated at the same axial center position in a state where it is prevented from falling out of the operating member b and is screwed to the tip of the operating body 4 is fed between the male screw part 42d and the female screw part 51a. By the action, as shown by the arrow B in the figure, the stopper 52 moves forward and backward in the horizontal axis direction, and vertically moves the stopper 52 toward and away from the outer surface of the side frame 24 of the rotating blackboard 2. As described above, in the present embodiment, the grip 41 rotates while maintaining the same axial position, and does not perform an advancing / retreating operation in the axial direction, and abuts the rotating blackboard 2 perpendicularly to provide an effective holding force. It works. Therefore, the operability is improved, and the rotating blackboard 2 can be effectively fixed with a relatively small operation force. In addition, since the support shaft 42d does not protrude and retract with respect to the hole 31b, a finger or clothes may be entangled. Also, an increase in operation resistance due to intrusion of dust and the like can be prevented.

Further, in this embodiment, since the fixed stopper 6 is disposed at a position corresponding to the stopper 52, when the stopper 52 is brought into contact with the outer surface of the side frame 24 of the rotating blackboard 2 through the operation of the grip 41. With this reaction force, the distance between the fixed stopper 5 and the outer surface of the side frame 24 of the rotating blackboard 2 can be reduced, and the fixed stopper 5 can be brought into contact with the rotating blackboard 2. Therefore, the rotating blackboard 2 can be fixed from the left and right with a simple configuration.

In addition, the operating body 4 is composed of a grip 41 and a support shaft 42, which are connected to the holes 31b of the support outer wall 31a.
Since they are merely adhered to each other via a wire, no welding work or the like is required, and the mounting is extremely simple.

The present invention is not limited only to the above-described embodiment. For example, as shown in FIGS. 16 to 18, since the concave groove 4 a is formed on the outer periphery of the flange portion 42 b in the gap between the grip 41 and the support shaft portion 42, the support shaft portion 42 of the operating body 4 is formed. Through the hole 31b provided in the outer wall 31a of the support column 31, and in this state, the front end 43 of the plate-like grip holder 43 is inserted into the concave groove 4a.
a may be engaged. The grip holder 43 is attached to the column 3 through a hole 43c formed in the base end 43b.
1 is fixed to the outer wall 31a by bolts or the like. Therefore, there is no need to weld the nut member to the inside of the column, and the effect similar to that of the above-described embodiment is obtained in that the assembly is significantly simplified. In this case, even if the grip holder 43 is attached to the outer wall 31a of the column 31, only the thickness equivalent of the plate protrudes from the column 31.
There is no bulk. In the above embodiment, the male screw portion is provided on the operation body 4 side and the female screw portion is provided on the operation body 5 side. However, the reverse configuration, that is, the female screw portion is provided on the operation body 4 side and the operation body 5 side is provided. A configuration in which an external thread portion is provided may be used. Further, in the above-described embodiment, the operating body 4 is configured by bonding the grip 41 and the support shaft 42, but may be formed integrally. In the above embodiment, the fixed stopper 6 is also used, but the basic configuration is not always essential. However, by providing the fixing stopper 6, an effect that the rotating blackboard 2 can be fixed in a balanced manner from the left and right can be obtained. When the rotating blackboard is heavy, a configuration in which the fixing device of the present invention is provided in a pair can be naturally considered. Furthermore, the configuration in which the operating body 4 is rotatably mounted so as not to be movable in the horizontal axis direction, and the configuration in which the operating body 5 is non-rotatably mounted so as to be movable in the horizontal axis direction are not limited to the above-described embodiments. Various modifications are possible without departing from the spirit.

[0030]

As described above, the rotating blackboard fixing device according to the present invention mounts the operating body having the grip on the outer wall side of the column so as to be rotatable and immovable in the horizontal axis direction, and at the inner wall side of the column. An operating body having a stopper is mounted so as to be non-rotatable and movable in the horizontal axis direction, and a base end of the operating body is connected to a distal end of the operating body so as to be able to advance and retreat. For this reason, the stopper always moves vertically to the outer surface of the side frame of the rotating blackboard, and abuts the outer surface under an effective friction area, so that the grip operation force is effectively converted to the fixing force of the rotating blackboard. Can be. Therefore, there is an effect that good operability and an appropriate use state are ensured. In addition to this effect, the grip always rotates at the same axis position and does not move back and forth with respect to the outer wall of the column, so that the operability is further improved and the column portion projects from the column. Since it does not sink, there is an effect that it is possible to eliminate a problem that a finger or clothes are entangled and operation resistance is increased due to intrusion of dust.

On the other hand, in the case where the fixed stopper is arranged at a position facing the stopper, the rotating blackboard can be fixed from both right and left sides by using the operating force of the grip.
The balance when fixed is good.

The operating body is composed of a grip and a support shaft, and both are connected to each other through a hole provided in the outer wall of the support, or are connected to the outer wall of the support through engagement of the groove and the plate. In the case of fixing or the polygonal shape in which the hole of the operating body and the column are closely fitted to each other, the operating body and the operating body can be attached very easily in a state where the desired operation can be obtained. .

[Brief description of the drawings]

FIG. 1 is a front view of a rotating blackboard to which an embodiment of the present invention is applied, to which a fixing device is applied.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is an exploded perspective view showing the fixing device of the embodiment.

FIG. 5 is a front view showing a grip constituting the operating body in the embodiment.

FIG. 6 is a left side view of the same.

FIG. 7 is a rear view of the same.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a front view showing a spindle portion constituting the operating body in the embodiment.

FIG. 10 is a plan view of the same.

FIG. 11 is a rear view of the same.

FIG. 12 is a front view showing the operating body of the embodiment.

FIG. 13 is a plan view of the same.

FIG. 14 is a right side view of the same.

FIG. 15 is a partial plan sectional view showing a state where the fixing device of the embodiment is assembled.

FIG. 16 is a perspective view corresponding to FIG. 4, showing another embodiment of the present invention.

FIG. 17 is a sectional view corresponding to FIG. 15 and showing a state where the fixing device is assembled in the embodiment.

18 is a sectional view taken along line XVIII-XVIII in FIG.

FIG. 19 is an explanatory view showing a conventional example.

[Explanation of symbols]

 m ... horizontal axis 2 ... rotating blackboard 4 ... operating body 4a ... concave groove 5 ... operating body 6 ... fixed stopper 31 ... pillar 31a ... outer wall 31b ... hole 31c ... inner wall 31d ... hole 32 ... beam 41 ... grip 42 ... spindle part 43: Plate (grip holder) 43a: Tip 52: Stopper

Claims (5)

(57) [Claims] The present invention is applied to a rotating blackboard pivotally supported via a horizontal axis between columns which are connected to each other in a vertical posture via a beam, and is attached to an outer wall of at least one of the columns. An operating body fitted in the hole provided so as to be rotatable and immovable in the horizontal axis direction, and having a grip formed at the base end; and a non-rotatable and movable in the horizontal axis direction fitted in a hole provided in the inner wall of the support post And a working body having a stopper formed at the tip thereof, which vertically faces the outer surface of the side frame of the rotating blackboard, and the base end of the working body is connected to the tip of the operating body so as to be able to advance and retreat. A rotating blackboard fixing device. 2. A fixed stopper facing the outer surface of a side frame of the rotating blackboard is disposed at a position on the inner wall of the other column corresponding to the stopper. Rotating blackboard fixing device. 3. The operation body according to claim 1, wherein a concave groove is provided around the outer periphery of the operating body, and the distal end of a plate fixed to the outer surface of the outer wall of the column is engaged with the concave groove. Rotating blackboard fixing device. 4. An operation body, wherein a grip is connected to a spindle portion on the distal end side of the grip, and a concave groove is formed in a gap between the grip and the spindle portion. The fixing device for a rotating blackboard according to claim 3. 5. The rotating blackboard fixing device according to claim 1, wherein the outer periphery of the operating body and the hole in the inner wall of the column are formed in a polygonal shape which fits tightly with each other.