Automatic chalk box

Abstract

A discharging assembly with the front end inclining downwards is hinged to the upper portion of a bottom plate of the automatic chalk box, the discharging assembly comprises a box body with the front end open and a check block fixedly arranged on the box body, the distance between the two transverse side walls of the box body is larger than the length of chalk, and the check block is located on the transverse side of the front end of the box body. The bottom plate is fixedly connected to the side wall of the corresponding side of the box body and located above the box bottom, the distance between the bottom plate and the box bottom is larger than the diameter of chalk, the front end of the bottom plate is provided with a front step extending transversely and provided with a limiting frame located on the front side of the front step, the front step is located on the other side of the check block in the transverse direction, and a top plate is installed on the limiting frame and located above the check block. The transverse inner end of the top plate and the transverse inner end of the stop block are vertically aligned, and a distance not smaller than the diameter of chalk is reserved between the transverse inner end of the front step and the transverse inner end of the stop block in the transverse direction. According to the chalk box, a user can conveniently take chalks from the chalk box.

Description

Technical Field

[0001] The utility model relates to an automatic chalk box. Background Art

[0002] Existing chalk box adopts the box body that can place chalk, comprises the sidewall of bottom surface and surrounding, and top can be established lid, and chalk is erected and placed in box body, and chalk can be extracted from chalk box by hand during use.But a lot of chalks are squeezed together, particularly when chalk box is fully loaded, to separate the chalks around and pinch single chalk can seem comparatively troublesome, and easily stick too much chalk powder on hand.For solving this problem, chalk box with certain automation function is designed.For example, Chinese patent literature CN113334976A discloses a kind of chalk box that is moisture-proof and convenient to take chalk, this chalk box is placed in the box body of sealing with chalk, and only pushes out chalk by the pen outlet, and when not in use, the sealing plate of opening and closing mechanism is sealed with the pen outlet, makes to form airtight space in the box body, can effectively prevent chalk from getting damp. When in use, the driving rod extending out of the box can be pressed to move the driving rod into the box, and at the same time, the spring can be compressed, which can sequentially drive the sealing plate of the opening and closing mechanism to rotate to open the pen outlet, and drive the push rod to move toward the pen outlet, thereby pushing the chalk out of the box a certain distance, so that the teacher can directly take the chalk, which is very convenient. After taking out the chalk, the driving rod is released, so that the compressed spring is released and the driving rod is pushed back to its original position, which can automatically drive the sealing plate of the opening and closing mechanism to rotate to close the pen outlet, and drive the push rod to return to its original position, so that the box body is sealed again to maintain a moisture-proof state. Chinese patent document CN215360686U discloses an automatic teaching chalk box, comprising a chalk box body, a flip door, a pen-taking port, a motor, and a fixed slot. The flip door is installed on the chalk box body, and the pen-taking port is opened on the chalk box body. A baffle is fixed inside the chalk box body, and the baffle is connected to a bottom plate. A rotating disk is provided above the bottom plate, and a limit groove is provided on the rotating disk. The baffle is provided with a groove, and a limit plate is installed on the bottom plate. The limit plate is provided with a spare chalk, and a sliding groove is provided on the limit plate. The sliding groove is provided with a push plate. The automatic teaching chalk box is provided with a rotatable rotating disk. The rotating disk transfers the spare chalk from the limit plate to the pen-taking port through the limit groove. Only one piece of chalk is exposed at a time, which protects the unused chalk and prevents the unused chalk from being damaged, thereby improving the chalk utilization rate of the automatic teaching chalk box. Chinese patent document CN113059954A discloses a multifunctional chalk box, including a base, the upper end of the base is fixedly connected to four support columns distributed in a rectangular shape, the upper ends of the four support columns are commonly fixedly connected to a box body, a chalk groove is provided at the right side of the upper end of the box body, a grinding cavity is provided inside the box body and on the left side of the chalk groove, a discharge hole connected to the upper end of the grinding cavity is provided at the upper end of the box body, a first rotating block is rotatably connected to the upper end of the box body and at the position of the discharge hole, a circular groove connected to the discharge hole is provided on the first rotating block, an annular groove is provided at the lower end of the first rotating block, and an annular tooth plate is fixedly connected to the inner circumferential wall of the annular groove.The advantages of this system include automatically grinding one end of the chalk, replacing the previous method where teachers had to break off the chalk ends before using them. This saves on chalk, avoids excessive waste, and facilitates the collection of unusable chalk ends. These existing technologies each have their own unique features, facilitating the handling and use of chalk through automated design. However, their relatively complex structures hinder their widespread adoption. Utility Model Content

[0003] The purpose of the present utility model is to provide an automatic chalk box to solve the problems raised in the above background technology.

[0004] The technical solution of the utility model is: an automatic chalk box, comprising a bottom plate, a discharging assembly with a front end inclined downwardly hinged above the bottom plate, the discharging assembly comprising a box body with an open front end (without a front end wall) and a stopper fixedly arranged on the box body, the spacing between the two lateral (left and right) side walls (two lateral side walls) of the box body is greater than (slightly greater than) the length of the chalk, the stopper is located on one lateral side (for example, the left side) of the front end of the box body, fixedly connected to the side wall on the corresponding side of the box body, located above the box bottom (the bottom of the box body), and the spacing between the stopper and the box bottom is greater than (slightly greater than) the diameter of the chalk (the maximum outer diameter of the chalk), the front end of the bottom plate is provided with a transversely extending front step (boss) and a limiting frame (for example, a vertical panel or a vertical grille perpendicular to the front and rear directions) located on the front side of the front step is installed, the front step is transversely extending When the cam is positioned on the left side of the stopper, the cam is positioned on the right side of the stopper, and the cam is positioned on the left side of the stopper so that the cam is positioned on the left side of the stopper.

[0005] Preferably, two vertical plates perpendicular to the horizontal direction are provided on the bottom plate, and the box body is rotationally connected to the two vertical plates via a horizontal rotating shaft (connected in a movable connection manner that allows relative rotation, for example, connected via a bearing or a bushing structure), and the vertical plates are provided with mounting holes for rotationally connecting to the rotating shaft, thereby enabling the discharge assembly to be hinged above the bottom plate (located above the bottom plate and hinged to the bottom plate).

[0006] Furthermore, the rotating shaft can be divided into two parts, including a left rotating shaft and a right rotating shaft. The left rotating shaft and the right rotating shaft are respectively fixedly installed on the left side wall and the right side wall of the box body, extending outward, and their outer ends are respectively rotatably connected to the vertical plates on the corresponding sides. The box body is located laterally between the two vertical plates.

[0007] Preferably, a return spring is installed between the rear end of the box body (the high end under normal conditions, which can be simply referred to as the high end) and the bottom plate. The return spring can be a pre-compressed coil spring (or thrust spring), the upper end of which abuts (pressure contacts / connects) the bottom surface of the box bottom, and the lower end abuts the upper surface of the bottom plate.

[0008] Furthermore, a lower spring mounting structure is provided on the upper surface of the base plate, and the lower end of the return spring (201) is fixedly mounted on the lower spring mounting structure. For example, the spring mounting structure may adopt an annular protrusion that allows the spring end to be inserted, and the spring end inserted into the annular protrusion is fixed to the base plate by a connecting piece.

[0009] Furthermore, an upper spring mounting structure corresponding to the lower spring mounting structure is provided on the lower surface of the box bottom, and the upper end of the return spring is fixedly mounted on the upper spring mounting structure.

[0010] Preferably, the rear end of the box body is provided with an operating pressure plate extending backward.

[0011] Preferably, a chalk groove is provided on the upper surface of the front step, and the chalk groove is a transverse groove spanning the entire upper surface of the front step, and the specific groove shape is conformal to the side of the chalk (adapted to the side shape of the chalk).

[0012] Preferably, the inner end of the top plate is provided with a top plate chalk slot (or slot), the inner end of the stop block is provided with a stop block chalk slot, and the inner end of the front step is provided with a front step chalk slot. The top plate chalk slot, the stop block chalk slot and the front step chalk slot can all be vertical grooves that conform to the side of the chalk.

[0013] Furthermore, the top plate chalk slot and the block chalk slot are aligned vertically (roughly aligned), and a spacing is left laterally between the block chalk slot and the front step chalk slot to accommodate an upright piece of chalk, that is, the space between the horizontal projections of the block chalk slot and the front step chalk slot is larger (slightly larger) than the horizontal projection of the upright piece of chalk.

[0014] Preferably, a circular groove (a groove with a circular cross-section) is provided on the bottom plate, the diameter of the circular groove is larger than the diameter of the bottom end of the chalk, and its left and right sides are respectively aligned with the block chalk slot and the front step chalk slot (roughly aligned).

[0015] The utility model has the following beneficial effects: a plurality of chalks are placed horizontally in the box body, and the chalks are arranged in a layer in the front-to-back direction. Under normal conditions, the front end of the box body is pressed against the bottom plate on the rear side of the front step by the return spring and / or by the gravity (gravitational torque) of the box body and the chalks in the box body. The height of the front step is roughly the same as the diameter of the chalks, so that the chalks at the front end of the box body are pressed against the rear side of the front step and will not slide to the top surface of the front step. When taking out the chalks, the operating pressure plate is pressed down by hand to turn the box body over under the rotation support of the rotating shaft, and the front end of the box body is tilted upward, and the front end of the box body is tilted to above the height of the front step (in this state, the box body is still tilted downward at the front end). The chalks at the front end of the box body slide into the chalk groove on the top surface of the front step. Since the width of the front step is roughly The chalk is then held in the drawer for easy removal and the top of the chalk is then released, and the user can then remove the remaining chalk from the drawer, which in turn allows the drawer to be opened and closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a partial structural diagram of the utility model;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the discharge component of the utility model;

[0020] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0021] In the figure: 1. Bottom plate; 2. Lower spring mounting structure; 201. Return spring; 3. Vertical plate; 301. Mounting hole; 4. Discharging assembly; 401. Box body; 402. Rotating shaft; 403. Operating pressure plate; 404. Stop block; 5. Front step; 501. Chalk slot; 6. Limiting frame; 7. Top plate; 701. Chalk slot on top plate; 8. Circular slot. DETAILED DESCRIPTION

[0022] See Figure 1 - Figure 4As shown, the automatic chalk box includes a bottom plate 1 , two vertical plates 3 are provided on the bottom plate 1 , and an inclined discharge assembly 4 is installed between the two vertical plates 3 .

[0023] By tilting the discharge component 4 , the chalk placed in the discharge component 4 can slide along the bottom end (also called the front end) formed by the inclined surface tilted toward the discharge component 4 .

[0024] Among them, the main part of the discharge component 4 is the box body 401, the bottom end of the box body 401 is an opening, and a stopper 404 is provided on one side of the opening of the box body 401. The distance between the stopper 404 and the bottom surface of the box body 401 is greater than the diameter of the chalk.

[0025] The chalk can be placed horizontally (the length of the chalk is horizontal) in the box body 401. Since the bottom end of the box body 401 is open due to the inclination, and the distance between the stopper 404 and the bottom surface of the box body 401 is greater than the diameter of the chalk, the chalk rolling along the inclined surface of the box body 401 (the inclined upper surface of the bottom) can roll out of the opening of the box body 401 (if there is no obstruction in front).

[0026] The box body 401 is provided with corresponding side rotating shafts (left rotating shaft and right rotating shaft) 402 on both sides of the lateral side. The outer ends of the rotating shafts 402 are installed in the mounting holes 301 opened on the corresponding vertical plates 3, and rotate with the mounting holes 301. A return spring 201 is installed between the raised high end (also known as the so-called rear end) of the box body 401 and the bottom plate 1.

[0027] The box body 401 is installed in the mounting hole 301 through the rotating shaft 402. By pressing the rear end of the box body 401, the box body 401 can be rotated around the axis of the rotating shaft 402. When the box body 401 is not subjected to external force, the rear end of the box body 401 is tilted up by the action of the return spring 201, and the front end is against the bottom plate.

[0028] The axis height of the rotating shaft / mounting hole should be higher than the height of the front step to ensure that when the front of the box reaches the height of the front step, it is still tilted in the front and back, so that the chalk in the box can slide into the chalk groove on the top of the front step.

[0029] An operating pressing plate 403 may be provided at the rear end of the box body 401 . Providing the operating pressing plate 403 facilitates placement of fingers and facilitates pressing the rear end of the box body 401 downward.

[0030] A front step 5 is provided at the front of the base plate 1 and a limit frame 6 is installed. The limit frame 6 is located on the outside of the front step 5. The position of the front step 5 should be close to the front end opening of the box body 401 in the normal state and should not hinder the box body from flipping over (there should be a moderately small distance from the front end of the box body in the normal state).

[0031] The side frame (side plate) can be arranged on the limiting frame 6 to form an L-shaped structure with the limiting frame (main body) to facilitate the fixed installation of the top plate 7. The lateral outer edge (outer end) of the top plate 7 can be fixed on the side plate of the limiting frame, and the front edge is fixed on the limiting frame (main body).

[0032] The top plate 7 is arranged corresponding to the stop block 404 and located above the baffle. In normal state, a certain gap is left between the top plate 7 and the baffle.

[0033] The top plate can be used as the limiting structure for the box body to be flipped (forward flipping), or other arbitrary suitable forms of box body flipping limiting structure can be arranged to limit the maximum flipping degree of the box body forward flipping (flipping with the rear end moving downward), so that after reaching the maximum degree of forward flipping, the box body is still inclined with the front end downward. For example, when the top plate is used as the limiting structure for the box body to be flipped, the height of the top plate can be appropriately set so that when the stop block contacts the top plate, the top plate blocks the stop block from moving further, thereby limiting the maximum degree of flipping of the box body.

[0034] The top plate (main body) can be a flat plate parallel to the bottom plate.

[0035] The stop block can be a plate parallel to the bottom of the box, which is usually a flat plate, or an arc plate conforming to the side surface of the chalk (in this case, the axis or generatrix of the arc plate is parallel to the bottom of the box).

[0036] The length (dimension in the transverse direction) of the front step can be significantly greater than the length of the stop block, for example, 2-3 times the length of the stop block, to facilitate the compactness of the overall structure and facilitate the user to take the chalk.

[0037] The length of the front step can be greater than half the distance between the two transverse side walls of the box body (for example, about 2 / 3 of the length of the chalk),

[0038] There is a gap between the inner end of the front step 5 and the inner end of the stop block 404 to allow the chalk to stand between them.

[0039] The height of the lowest part of the stop block 404 (relative to the height of the bottom of the box) is the same as the height of the front step 5 (relative to the height of the bottom plate). When the operation pressing plate 403 is pressed downward, the box body 401 connected thereto rotates around the axis of the rotating shaft 402 (the rear end moves downward), and when the front end of the bottom of the box is higher than the front step 5, the chalk placed in the box body 401 falls onto the upper surface of the front step 5.

[0040] The width of the upper surface of the front step 5 (dimension in the front-rear direction) is the same as the maximum diameter of the chalk, and the length of the upper surface of the front step 5 is less than the length of the complete chalk.

[0041] When the pressure on the operating pressure plate 403 stops, the box body 401 is reset under the action of the reset spring 201. During the falling process of the front end of the box body 401, the stopper 404 presses down the protruding end of the chalk that falls on the upper surface of the front step 5 until the chalk rotates around the end of the front step 5 to a vertical state, and the stopper 404 and the bottom end of the box body 401 fall completely.

[0042] A chalk groove 501 may be provided on the upper surface of the front step 5. The chalk groove 501 is an arc-shaped groove to prevent chalk falling into the chalk groove 501 from rolling out.

[0043] The inner end of the top plate 7 is provided with a top plate chalk slot 701, the inner end of the stopper 404 is provided with a stopper chalk slot, and the bottom plate 1 is provided with a circular groove 8 located on the inner end of the front step 5. After the chalk is erected, the lower end falls into the circular groove 8;

[0044] After the chalk is turned over to the upright state, it contacts the top plate chalk slot 701 to limit the position of the chalk turning. The lower part of the chalk is also limited by the block chalk slot and the front step chalk slot to keep the chalk stable.

[0045] When using, first place the chalk in the box body 401 in advance and spread it into a layer. When you need to take out the chalk, press the operating plate 403 to make the box body 401 drive the rotating shaft 402 to rotate in the mounting hole 301, so that the rear end of the box body 401 is tilted up, and at the same time the box body 401 squeezes the return spring 201 so that the return spring 201 provides a rebound force to the box body 401, and the front end of the box body 401 is tilted to the top surface of the front step, so that the frontmost chalk in the box body 401 slides into the chalk groove 501. After releasing the operating plate 403, the return spring 201 brings The movable box body 401 rebounds and resets. Since the position of the stop block 404 is higher than the position of the chalk, when the stop block 404 is reset together with the box body 401, the stop block presses down the chalk groove 501 located below it. Therefore, under the joint action of the baffle and the front step 5, the chalk stands between the front step 5 and the stop block 404. The chalk clamping slot 701 on the top plate limits the position of the chalk and makes it stable, thereby achieving the effect of making it convenient for users to take it and improving practicality.

[0046] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. Automatic chalk box, including a bottom plate (1), characterized in that: A material discharge assembly (4) with a front end tilted downward is hinged above the bottom plate (1). The material discharge assembly (4) comprises a box body (401) with an open front end and a stopper (404) fixedly arranged on the box body. The distance between the two lateral side walls of the box body (401) is greater than the length of the chalk. The stopper (404) is located on one lateral side of the front end of the box body and is fixedly connected to the side wall of the corresponding side of the box body. It is located above the bottom of the box and the distance between it and the bottom of the box is greater than the diameter of the chalk. The front end of the bottom plate (1) is provided with A front step (5) extends transversely and is provided with a limiting frame (6) located at the front side of the front step. The front step is located on the other side of the stop block (404) in the transverse direction. A top plate (7) is installed on the limiting frame (6). The top plate (7) is located above the stop block (404). The transverse inner end of the top plate (7) and the transverse inner end of the stop block (404) are aligned vertically. A spacing of not less than the diameter of a chalk is left in the transverse direction between the transverse inner end of the front step (5) and the transverse inner end of the stop block (404).

2. The automatic chalk box according to claim 1, characterized in that: Two vertical plates (3) perpendicular to the horizontal direction are provided on the bottom plate (1); the box body is rotatably connected to the two vertical plates (3) via a horizontal rotating shaft; and mounting holes (301) for rotatably connecting to the rotating shaft are provided on the vertical plates.

3. The automatic chalk box according to claim 2, characterized in that: The rotating shaft is divided into two parts, including a left rotating shaft and a right rotating shaft. The left rotating shaft and the right rotating shaft are respectively fixedly mounted on the left side wall and the right side wall of the box body, extending outward, and their outer ends are respectively rotatably connected to the vertical plates on the corresponding sides. The box body is located laterally between the two vertical plates.

4. The automatic chalk box according to claim 1, characterized in that: A return spring (201) is installed between the rear end of the box body (401) and the bottom plate (1). The return spring is a thrust spring, the upper end of which abuts against the bottom surface of the box bottom, and the lower end abuts against the upper surface of the bottom plate (1).

5. The automatic chalk box according to claim 4, characterized in that: A lower spring mounting structure (2) is provided on the upper surface of the bottom plate (1), and the lower end of the return spring (201) is fixedly mounted on the lower spring mounting structure.

6. The automatic chalk box according to claim 5, characterized in that: An upper spring mounting structure corresponding to the lower spring mounting structure is provided on the lower surface of the box bottom, and the upper end of the return spring (201) is fixedly mounted on the upper spring mounting structure.

7. The automatic chalk box according to claim 1, characterized in that: The rear end of the box body (401) is provided with an operating pressing plate (403) extending backward.

8. The automatic chalk box according to any one of claims 1 to 7, characterized in that: The upper surface of the front step (5) is provided with a chalk groove (501), and the chalk groove is a transverse groove spanning the entire upper surface of the front step.

9. The automatic chalk box according to claim 8, characterized in that: The inner end of the top plate (7) is provided with a top plate chalk slot (701), the inner end of the stop block (404) is provided with a stop block chalk slot, and the inner end of the front step is provided with a front step chalk slot. The top plate chalk slot, the stop block chalk slot and the front step chalk slot are all vertical grooves conforming to the side of the chalk. The top plate chalk slot and the stop block chalk slot are aligned vertically, and a spacing is left between the stop block chalk slot and the front step chalk slot in the horizontal direction to accommodate an upright chalk.

10. The automatic chalk box according to claim 9, characterized in that: A circular groove (8) is provided on the bottom plate (1), the diameter of the circular groove being larger than the diameter of the bottom end of the chalk, and the left and right sides of the circular groove are respectively aligned with the stopper chalk slot and the front step chalk slot.

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