JP2000177292A - Blackboard chalk powder cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blackboard chalk powder cleaning device having a structure in which the rotation of a blackboard wiper placing rack can be carried out smoothly without utilizing the elasticity of the blackboard wiper placing rack, the overflow of chalk powder out of a chalk powder receiving gutter is prevented and a cleaner cannot be taken out of the chalk powder receiving gutter. SOLUTION: A blackboard chalk powder cleaning device is constituted of a chalk receiving gutter 12 set on the lower section of a blackboard 11, circular channels 13a and protruded lines 12b of lower openings formed on the front inner wall and the rear inner wall of the chalk powder receiving gutter 12, a blackboard wiper placing rack 14 of a lattice structure provided on the upper section of the chalk powder receiving gutter 12 provided with a shaft section 14b to be inserted rotatably into the circular channels 13a and connected with through connecting pieces and formed continuously to the front and also provided with a rear edge placed on the protruded lines 12b, and a cleaner having a bottom of a transverse face matched with the sectional shape of the inner peripheral face of the chalk powder receiving gutter 12 and also having channels to be fitted with the protruded lines 12b of the chalk powder receiving gutter 12 on the rear section and provided with a grip to be held when the chalk powder receiving gutter is cleaned and provided on the front of a highly bulky section of a central section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for facilitating cleaning of chalk powder and preventing chalk powder falling on a drain gutter from adhering again to a blackboard wipe.

[0002]

2. Description of the Related Art A problem when using a blackboard is that chalk powder falls on a trough when the blackboard is wiped with a blackboard wiper.
Because the chalkboard wipe or chalk is placed on the chalk powder, the chalk powder adheres to the felt surface again when the chalkboard wipe is placed on the gutter, and the chalkboard surface becomes dirty or dusty the next time the chalkboard is wiped. And the falling chalk powder adheres to the chalk placed on the gutters, causing the hands to get dirty when writing on the blackboard.

[0003] For this reason, it is said that the clothes are stained and the respiratory tract is harmed by the suction of chalk powder, which is a major cause of causing lung diseases especially to teachers. Furthermore, chalk powder directly drops and accumulates on the conventional gutter, so if you use a wet cloth to clean it, the gutter will get wet,
If the blackboard is used before it has dried yet, there is a problem that the chalk powder that has fallen is stuck and cleaning becomes difficult.

In order to solve such a problem, the present applicant has previously proposed a blackboard chalk powder cleaning apparatus shown in FIGS. 5 to 8 in Japanese Utility Model Publication No. 2-45035. FIG. 5 is a side view showing the conventional example, FIG. 6 is a perspective view thereof, and FIG.
84 is a perspective view of the cleaner, and FIG. 84 is a perspective view showing the movement of the blackboard wiping mounting shelf in the cleaning state. In the figure, 1 is a blackboard,
2 is a chalk powder receiving gutter, 3 is a blackboard wiping mounting shelf, 4 is chalk, 5 is a chalk powder receiving box, 6 is a side cap, and 7 is a cleaner.

That is, in these figures, the blackboard chalk powder cleaning device includes a chalk powder receiving trough 2 which is attached to the lower part of the blackboard 1 so as to protrude forward, and a predetermined space above the chalk powder receiving trough 2. The blackboard wiping rack 3 has a lattice structure and is attached to the blackboard side mounting portion so as to be openable and closable upward, and a cleaner 7 for cleaning chalk powder accumulated in the chalk powder receiving gutter 2. The cleaner 7 has a bottom having a cross-sectional shape that matches the cross-sectional shape of the inner peripheral surface of the chalk powder receiving gutter 2, and the height of both side ends is set to the inner bottom surface of the chalk powder receiving gutter 2 and the blackboard wiping mounting shelf 3. The height is lower than the height of the chalk powder receiving trough 2 and the blackboard wiping rack 3
The chalk powder receiving gutter 2 is formed so as to be bulkier than the height of the fulcrum, and an insertion port 7a for inserting a tip of the hand at the time of cleaning the chalk powder receiving gutter is formed in the upper front part of the bulky portion at the center.

In the blackboard chalk powder cleaning apparatus proposed earlier, the blackboard wiping and mounting shelf 3 is formed of a synthetic resin material, and the base 3a and the lattice 3b are formed to be freely bendable at a continuous portion thereof. Have been. When the mounting shelf 3 is mounted on the gutter 2, its tip is normally locked to the front step 2 e of the gutter 2, but when a force is applied upward,
It can be bent as shown in FIG.

As a result, the chalk powder receiving box 5 can be mounted without protruding below the gutter 2, so that even if the chalk powder receiving box 5 is a shelf or the like under the blackboard 1, it can be installed without affecting the space of the shelf. In addition, the chalk powder receiving box 5 can be installed on the existing blackboard.

[0008]

However, the following problems have been pointed out during use of the blackboard chalk powder cleaning device.

(1) When the blackboard wiping mounting shelf 3 is bent upward by the cleaner 7, the base portion 3a is bent in the flat groove 2d while keeping its posture, so that the base portion 3a is made of synthetic resin. Depending on the material of the blackboard wiping shelf 3, the bend becomes hard in winter and does not bend smoothly, or if the cleaner is left underneath, the bend loses its elasticity and the cleaner becomes Even if it is moved to the place, the blackboard wiping mounting shelf 3 remains bent in the original state, and does not return to the forward inclined state.

(2) When wiping the blackboard by wiping the blackboard, the chalk powder falls down in a layer along the board surface of the blackboard. When the chalk powder layer reaches the chalk powder trough, It moves along the inner surface and flows forward past the jetty in front of the chalk flue trough, thus soiling the clothes of teachers and students wiping the blackboard.

(3) Since the cleaner can easily be taken out from the chalk powder trough in the forward direction, the cleaner may be wiped with the cleaner by mistake, and the surface of the blackboard may be damaged. Because it is not placed in the chalk powder, it hinders the cleaning of the original chalk powder gutter.

The problem to be solved by the present invention is to smoothly rotate the blackboard wiping rack without using the elasticity of the blackboard wiping rack, thereby preventing chalk powder from overflowing from the chalk powder receiving gutter. It is another object of the present invention to provide a blackboard chalk powder cleaning apparatus having a structure which can be removed from a chalk powder trough by a cleaner.

[0013]

In order to solve the above problems, a blackboard chalk powder cleaning apparatus according to the present invention comprises a chalk powder trough which is attached to a lower portion of a blackboard so as to protrude forward, and a front inner wall of the chalk powder trough. And a circular groove and a ridge of a lower opening formed on the rear inner wall along the longitudinal direction of the chalk powder receiving gutter, respectively, and are disposed above the chalk powder receiving gutter, and the circular shape of the chalk powder receiving gutter is provided forward. A shaft portion rotatably fitted into the groove is continuously provided via a connecting piece, and a rear edge portion of the chalk powder receiving trough is placed on a ridge of the chalk powder receiving gutter. It has a bottom having a cross-sectional shape that matches the cross-sectional shape of the inner peripheral surface of the gutter, and has a groove that fits in a ridge of the chalk powder receiving gutter at a rear portion, and the height of both end portions is the height of the chalk powder receiving gutter. Than the height between the inner bottom surface of the gutter and the lower part of the blackboard wiping shelf The central portion is smoothly connected to the both end portions, and is formed so as to be bulkier than the height of the front jetty of the chalk powder receiving gutter and the height of the shaft portion of the blackboard wiping mounting shelf. A cleaner is provided in front of the bulky portion with a handle that can be held when cleaning the chalk powder gutter.

In this device, a bent portion for preventing the cleaner from tilting upward from the front edge is formed along the longitudinal direction of the chalk powder receiving gutter below the circular groove in the front inner wall of the chalk powder receiving gutter. Things. Furthermore, the portion forming the circular groove and the protruding portion may be configured to be detachable with a long material separate from the chalk powder receiving gutter main body.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to embodiments shown in the drawings. FIG.
Fig. 2 is a side sectional view showing an embodiment of the apparatus according to the present invention, Fig. 2 is a perspective view thereof, 11 is a blackboard, and 12 is a chalk gutter. The gutter 12 can be manufactured by molding an aluminum material by hot extrusion or cold drawing.
The one cut into one length is attached to the lower part of the blackboard 11. On the inner wall in front of the gutter 12 (on the blackboard side), an auxiliary bar 13 is fixed so as to overlap with the gutter 12, and the auxiliary bar 13 is formed with a circular groove 13a having a lower opening and a protruding portion 13b. A horizontal piece 13c for alignment with the front edge 12a of the gutter 12 is formed.

A ridge 12b is formed on the rear (front side) inner wall of the receiving gutter 12. The front side of the ridge 12b is a pier 12c higher than the ridge 12b. The gutter 12 and the auxiliary bar 13 are separated from each other in that the blackboard without the cleaning device of the present invention and the blackboard to be mounted have common parts,
In addition, when the cleaning device is attached later, it is not necessary to replace the chalk powder receiving gutter 12.

In the circular groove 13a of the auxiliary bar 13, a connecting piece 14 is provided in front of the blackboard wiping mounting shelf 14 from the side of the auxiliary bar 13.
c, the shafts 14a and 14b connected via
The plurality of blackboard wiping shelves 14 cover the upper part of the gutter 12. The front edge of the blackboard wiping mounting shelf 14 rides on the ridge 12b of the gutter 12.

The blackboard wiping mounting shelf 14 is formed of a synthetic resin material. As shown in FIG. 3, the shaft portions 14a and 14b and the lattice portion 14d are thinner than the diameters of the shaft portions 14a and 14b. The connecting piece 14c is configured to be rotatable. Therefore, when the mounting shelf 14 is mounted on the gutter 12,
The tip of the circular groove 13a is on the front ridge 12b of the gutter 12 in a normal state, but when a force is applied upward, the circular groove 13a in which the shaft portions 14a and 14b are fitted as shown in FIG.
Can be rotated as a bearing. Shaft 14
The tips of a and 14b project from the end of the mounting shelf 14 by about half the width of the lattice of the mounting shelf 14. The reason is that when a plurality of mounting shelves 14 are juxtaposed and juxtaposed on the gutter 12, the mounting shelves 14 are prevented from contacting and interfering with each other at the side portions, and the adjacent mounting shelves 14 are not in contact with each other. For this reason, when the shaft portions 14a and 14b of the adjacent mounting shelves 14 are placed side by side, the spacing between the mounting shelves 14 is substantially the same as the width of the lattice of the mounting shelves 14. Also, the shaft 14
The main bodies of a and 14b are barrel-shaped so that the mounting shelf 14 can freely tilt even when attached to the circular groove 13a of the chalk powder receiving gutter 12 provided on the gently curved blackboard. 1, 15 is a chalk, 16 is a chalk powder receiving box, 17 is a side cap of the receiving gutter 12, 12d
Is a hole for removing chalk powder.

FIGS. 4A and 4B show an embodiment of the cleaner 18 used in the present invention. FIG. 4A is a perspective view, and FIG. 4B is a bottom view. The cleaner 18 has a bottom portion having a cross-sectional shape that matches the cross-sectional shape of the inner peripheral surface of the chalk powder receiving gutter 12, and a groove 18 a that fits into the ridge 12 b of the chalk powder receiving gutter 12 at the rear portion.
And a groove 18b fitted to the jetty 12c, and the height of both side ends is set to the inner bottom surface of the chalk powder receiving gutter 12 and the blackboard wiping mounting shelf 14
Lower than the lower part, the center part is smoothly connected to both ends, and the front jetty 12c of the chalk powder receiving gutter 12
Is formed so as to be bulkier than the height of the shaft portions 14a and 14b of the blackboard wiping mounting shelf 14, and a handle 18c which can be held at the time of cleaning the chalk powder trough is provided in front of the bulky portion in the center. ing. A concave portion 18d is formed on the bottom surface of the cleaner 18 so as to collect chalk powder during cleaning, and a cleaning cloth (not shown) such as felt is attached to the bottom surface excluding the concave portion 18d. The front portion of the cleaner 18 is located below the bent portion 13b of the auxiliary bar 13 as shown in FIG. 1, and the protrusion 18b and the groove 18a are fitted. It does not come off the shelf 14 and can only slide horizontally.

A method using the above-structured apparatus will be described below. A blackboard wiping mounting shelf 14 is mounted on the gutter 12, and the blackboard wiping is placed on the shelf 14. When the characters on the blackboard 11 are erased by wiping the blackboard, the chalk powder falls along the surface of the blackboard 11 and accumulates on the upper surface of the trough 12 through the gap of the shelf 14. Therefore, no chalk powder accumulates on the shelf 14, and even if a blackboard wiper is placed on the chalk powder, the chalk powder does not become dirty again. In addition, if the blackboard wiper is rubbed against the shelf 14 and moved left and right several times, the chalk powder attached to the blackboard wiper can be removed. For example, an electric chalk cleaner provided in a corner of a classroom is used as in the past. No need. When the chalk is placed on the shelf 14, since the shelf 14 is installed at an angle, the chalk is rolled forward, and even if the chalk powder falls when the blackboard 11 is wiped with the blackboard wiper, the chalk has dust. It is not necessary to do the unsanitary thing which blows chalk with a breath and scatters it conventionally.

The shelf 14 can sufficiently perform the above-mentioned function even if it is installed horizontally. However, by installing it at an angle, the chalk placed on the shelf 14 rolls forward and drops when the blackboard is wiped. Can be avoided from powder flow. In addition, if the chalk is placed on the blackboard wiping mounting shelf 14 in parallel with the blackboard 11, the chalk always rolls to the front, so that the trouble of searching for the chalk can be saved.

In order to clean the chalk powder accumulated on the gutter 12, the cleaner 18 normally placed on the side of the gutter 12 is moved toward the other end of the gutter 12. , FIG. 2
The shelf 14 under which the cleaner 18 dives as shown in FIG.
Is evacuated upwards, and the chalk powder is swept away by the bottom of the cleaner 18 having a shape adapted to the inner peripheral surface of the trough 12, and the chalk powder receiving box 16 is dropped from the drop opening 12d at the other end of the trough 12. Collected in. When the shelf 14 opens upward, the shelf 14
The upper chalk 15 is rolled to the blackboard 11 side as shown in FIG. 1, and the blackboard wipe is also moved to the blackboard 11 side. There is no need to remove them, and cleaning can be performed with these components placed.

Further, when the blackboard is wiped, the chalk powder falling down along the surface of the blackboard in a layered manner is urged by the gutter 1
The ridge 12b prevents the flow of the chalk powder from flowing out while the ridge 12b prevents the flow of the chalk powder from flowing out.

[0024]

As described above, according to the present invention, the following effects can be obtained. (1) The blackboard wiping shelf can be tilted by fitting the shaft into the circular groove on the chalk powder receiving gutter side. Therefore, even if the material of the blackboard wiping shelf is not elastic, or in winter and summer Thus, even if there is a change in elasticity, it can be smoothly tilted regardless of its characteristics. (2) When wiping the blackboard by wiping the blackboard, the chalk powder falls down in a layer along the board surface of the blackboard, but since the inner wall of the chalk powder receiving trough is provided with a ridge, the chalk powder becomes chalk powder receiving trough. Without flowing over the jetty in front of
It can prevent the clothes of teachers and students wiping the blackboard from being stained. (3) Since the cleaner cannot be taken out of the chalk powder trough, there is no chance that the cleaner will be mistaken for a blackboard wiper, and it will not be lost.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of the present invention.

FIG. 2 is a perspective view showing an installation state of the present invention.

FIG. 3 is a perspective view showing an embodiment of a blackboard wiping mounting shelf of the present invention.

FIG. 4 shows a cleaner of the present invention, wherein (a)
Is a perspective view, and (b) is a bottom view.

FIG. 5 is a side view showing a conventional example.

FIG. 6 is a perspective view of a conventional example.

FIG. 7 is a perspective view of a conventional cleaner.

FIG. 8 is a perspective view showing movement of a blackboard wiping mounting shelf in a cleaning state in a conventional example.

[Explanation of symbols]

1: blackboard, 2: chalk powder gutter, 3: blackboard wipe mounting shelf,
4: chalk, 5: chalk powder tray, 6: side cap, 7: cleaner, 11 blackboard, 12 chalk trough,
12a front edge, 12b ridge, 12c pier, 12d
Chalk powder drop hole 13 Auxiliary bar, 13a circular groove, 13b bent portion, 13c horizontal piece, 14 blackboard wiping mounting shelf, 14a, 14b shaft portion, 14c connecting piece, 14d
Lattice, 15 chalk, 16 chalk powder box, 1
7 Side cap, 18 cleaner, 18a, 18b
Groove, 18c Handle, 18d recess

Claims (3)

[Claims] 1. A chalk powder receiving gutter attached to a lower part of a blackboard so as to protrude forward, and a lower opening formed in a front inner wall and a rear inner wall of the chalk powder receiving gutter along a longitudinal direction of the chalk powder receiving gutter, respectively. A circular groove and a ridge, and a shaft portion, which is disposed above the choke powder receiving gutter and is rotatably fitted into the circular groove of the chalk powder receiving gutter via a connecting piece, and is connected rearward. A blackboard wiping mounting shelf having a lattice structure whose edge rests on a ridge of the chalk powder receiving gutter; and a bottom having a cross-sectional shape that matches a cross-sectional shape of an inner peripheral surface of the chalk powder receiving gutter, and a rear portion. Has a groove that fits into the ridge of the chalk powder receiving gutter, and the height of both side ends is lower than the height between the inner bottom surface of the chalk powder receiving gutter and the lower portion of the blackboard wiping mounting shelf. , The center portion is smoothly connected to the both end portions, and the chalk powder receiving gutter has a forward projection. A cleaner which is formed so as to be bulkier than the height of the bank and the height of the shaft portion of the blackboard wiping mounting shelf, and which is provided in front of the bulky portion at the center portion with a handle which can be held when cleaning chalk powder receiving gutters. Blackboard chalk powder cleaning device. 2. A method according to claim 1, wherein a curved portion is formed below the circular groove in the front inner wall of the chalk powder receiving gutter along a longitudinal direction of the chalk powder receiving gutter to prevent the cleaner from tilting upward. The blackboard chalk powder cleaning device according to claim 1, wherein: 3. The blackboard chalk powder cleaning apparatus according to claim 2, wherein a portion forming the circular groove and the protruding portion is detachably formed of a long material separate from the chalk powder receiving gutter main body. .