JP7140394B2 - Eraser crumb collection tool - Google Patents

Description

The present invention is a collection tool for magnetically attracting, collecting, and discarding eraser dust generated after use of an eraser using iron powder or the like.

Conventionally, there has been a collection tool that attracts an eraser containing fine powder with a magnet.

JP 2012-161926 A Published utility model No. 60-179497

In the prior art documents, a magnet is placed inside a cylindrical body in order to collect eraser crumbs after using an eraser that is attracted by magnetic force, and eraser crumbs are attracted by the magnetic force of the magnet. In both Patent Literatures 1 and 2, the magnet is brought closer to attract the object, and then the magnet is moved away to release the attracted state.

However, after attracting the magnet by bringing it closer, it is necessary to move the magnet away to cancel the attracted state, and it has been desired to perform this operation with one click. Eraser crumbs that are attracted by magnetic force may not be released from the state of being attracted to the attracting surface due to static electricity or the like even when the magnet is moved away.

Therefore, it is an eraser crumb collecting tool that attracts eraser crumbs attracted by magnetic force, releases the attracted state and can be released to a trash box, etc., and especially with a simple finger motion, the magnet can be moved away from the attracting part and returned with one click. There has been a demand for an eraser crumb collection tool that can

The present invention is an eraser dust collection tool for attracting and discarding eraser dust that is attracted by a magnetic force, comprising a tubular body having a space for advancing and retracting in the longitudinal direction, and one longitudinal space of the tubular body. a magnet holder that holds a magnet and advances and retreats in a space of the tubular body; an elastic body that urges the magnet holder toward the rear surface of the attraction section; and the magnet holder. a forward/retreat lever extending from the body and arranged outside the tubular body.

Further, the magnet holding body has a housing portion for holding the magnet on the upper side by a peripheral wall erected around the magnet, and the surface of the peripheral wall on the side of the attracting portion and the back surface of the attracting portion move forward and backward so that they can come into contact with each other. preferably.

Moreover, it is preferable that the attracting portion has a flat back portion on the back surface at a position in contact with the peripheral wall of the magnet holder, and has a recessed portion that reduces the thickness at a position where the magnets held by the magnet holder are close.

One end of the spring, which is an elastic body, is supported by the inner bottom surface of the tubular main body, and the other end is supported by the inner tubular portion extending downward from the bottom surface of the accommodation portion of the magnet holder, The spring constant of the spring body is preferably in the range of 0.1 N/mm to 0.2 N/mm.

The advance/retreat lever is composed of a horizontal lever portion extending from an accommodating portion that accommodates the magnet, and a lever handle portion formed at the tip of the horizontal lever portion. A vertical opening for leading out of the cylinder and allowing the horizontal lever to move up and down according to the advance and retreat of the magnet holder, and a cylindrical inner surface of the tubular main body that engages with the ridges formed on the magnet holder. It is preferable to have a recessed groove that

Further, the lever handle portion has a curved portion extending from the tip of the horizontal lever portion to the apex and extending to straight portions at both ends. It is preferable to incline to

According to the first aspect of the present invention, the magnet of the magnet holder is urged by the elastic body toward the planar portion (attracting surface) of the attracting portion, and the magnetic force can attract eraser crumbs to the attracting surface. When removing eraser crumbs from the attracting surface and disposing of them, the user pulls the reciprocating lever with a finger to separate the magnet from the attracting surface, thereby weakening the magnetic force acting on the attracting surface.

According to the second aspect of the invention, the peripheral wall that accommodates and holds the magnet can be brought into contact with and separated from the rear surface of the attracting surface by an elastic body. Since the holder vigorously moves toward the attracting surface, it is not necessary to return the magnet holder to the attracting surface, and the peripheral wall collides with the back surface of the attracting surface. With this impact, eraser crumbs sticking to the attracting surface due to static electricity etc. can be flipped off, and with a simple finger movement, the magnet can be moved away from the attracting part and returned with a single click, making it easy to dispose of the eraser crumbs. Become.

According to the third aspect of the present invention, the concave portion prevents the magnet from directly contacting or colliding with the attracting portion, thereby preventing damage and facilitating transmission of the magnetic force.

According to the fourth aspect of the invention, by setting the spring constant of the spring used as the elastic body to 0.1 N/mm to 0.2 N/mm, it is possible to repel eraser crumbs sticking to the adsorption surface due to impact. Not only is it possible, but it also eliminates the fact that even the adsorption surface is flipped off due to too strong a shock, making it possible to stably dispose of eraser crumbs.

According to the fifth aspect of the invention, the advance/retreat lever formed on the magnet holder is guided by the vertical opening of the tubular body so as not to be displaced to the left and right. By being guided by the two concave grooves as well, the magnet holder can be stably advanced and retracted by the three guides.

According to the sixth aspect of the present invention, the advance/retreat lever is operated by a user's finger, and has a curved portion with the center as the apex, and an upper plane of the curved portion slanted downward toward the outside. Therefore, it is possible to easily slide the operating finger. As a result, it is possible to easily release the pull of the advance/retreat lever and make the magnet holder collide with the back surface of the attracting portion more easily.

1 is an overall perspective view showing an example of an eraser dust collector of the present invention. FIG. 1 is an exploded front view showing an example of an eraser dust collector of the present invention. FIG. FIG. 4 is a perspective view showing an example of a tubular body and an elastic body that are part of the collection tool; FIG. 4 is a perspective view showing an example of a magnet holder and magnets that are part of the collection tool; 1 shows an example of a suction part that is a part of the collecting tool, in which (a) is a perspective view seen from the upper surface, and (b) is a perspective view seen from the lower back surface. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, showing an example of a suction part which is a part of the collecting tool. 1 is a perspective view showing an example of a state in which a collecting tool of the present invention is attached to a pencil-shaped eraser case; FIG.

An embodiment of the present invention will be described with reference to the drawings. In the present description, when the longitudinal direction of the collecting tool 1 is defined as the vertical direction, the suction portion 70 (upper right in FIG. 1) is on the upper side, and the inner bottom surface 14 (lower left in FIG. 1) of the tubular main body 10 is on the lower side. .

As shown in FIGS. 1 and 2, the eraser dust collector 1 according to the present embodiment comprises a tubular main body 10, a magnet holder 30, a spring 60, and an adsorption portion . The magnet holder 30 can move back and forth within the cylindrical main body 10 and is held in a state in which the magnet 33 is urged toward the back side of the attracting portion 70 by the elastic force of the spring 60 . When the magnet holder 30 is pushed down, the eraser crumbs attracted to the attracting portion 70 are released and can be discarded at a disposal site. Each member will be described below.

As shown in FIG. 3, the tubular body 10 is hollow inside and is a cylindrical body whose longitudinal direction is the vertical direction. The cylindrical main body 10 has a two-stage shape with a narrowing position 13 interposed therebetween for narrowing the diameter near the center in the longitudinal direction, and consists of an upper main body 10a with a large diameter and a lower main body 10b with a small diameter.

The upper plane serving as one end surface in the longitudinal direction is opened to form an opening surface 12a, and the lower plane serving as the other end surface in the longitudinal direction is also opened to form an opening surface 12b. An inner bottom surface 14 that partitions the space 11 is formed just above the lower opening surface 12b of the lower body 10b. In the present embodiment, the inner bottom surface 14 has a circular opening at the central portion to the extent that the spring and the magnet holder do not pass through, but it may be completely shielded. The inner stage 13a is arranged as a stopper so that the later-described magnet holder 30 is not pulled down more than necessary.

The advance/retreat space 11 of the present embodiment is formed linearly in the longitudinal direction inside the tubular main body 10 . Specifically, the upper side is a space where the opening surface 12a of the cylindrical main body 10 is closed by the adsorption portion 70 as described later (see FIG. 1), and the lower side is a space that becomes the inner bottom surface 14. As shown in FIG. In this embodiment, the accommodation portion 31 of the magnet holder 30, which will be described later, abuts on the inner step 13a of the tubular main body 10 so that it does not move downward. are positioned within the lower body 10b of the tubular body 10. As shown in FIG.

The upper main body 10a has a vertical opening 15 formed along its longitudinal direction through which a forward/retreat lever 40 (see FIG. 2), which will be described later, passes. The vertical opening 15 is linearly opened with a predetermined width from the opening surface 12a to the diaphragm position 13, and becomes a relatively wide opening portion. Vertical grooves 16, 16 are formed on the inner surface of the upper body 10a at positions different from the vertical opening 15. As shown in FIG. In this embodiment, the grooves 16, 16 are arranged on both sides when the vertical opening 15 is viewed from the front. Further, an engaged piece 17 for engaging with an engaging piece 74 of the adsorption portion 70, which will be described later, is formed on the inner peripheral surface slightly below the opening surface 12a of the upper body 10a.

As shown in FIG. 4, the magnet holder 30 accommodates and holds the magnet 33 facing upward and moves forward and backward in the forward and backward space 11 inside the cylindrical main body 10 (see FIG. 2). an accommodation portion 31 , an advance/retreat lever 40 extending from the accommodation portion 31 , and a cylindrical inner cylinder portion 50 protruding downward from the accommodation portion 31 .

The accommodation portion 31 is a cylindrical member, and is formed with a peripheral wall 34 erected from an upper surface 32 . In this embodiment, the upper plane of the peripheral wall 34 and the upper plane of the magnet 33 are flush with each other. The magnet 33 of this embodiment is cylindrical, and the peripheral wall 34 is also formed in a circular shape to match the outer circumference of the magnet 33 . Here, it is not necessary for the peripheral wall 34 to cover all the side surfaces of the magnet 33 , and it is sufficient that the peripheral wall 34 can hold the magnet 33 and stand up to the extent that it can contact the back surface of the attracting portion 70 . In this way, the upper planes of the magnet 33 and the peripheral wall 34 are urged by the elastic force of the spring 60 to come into contact with the back surface of the attracting portion 70, and are separated by the action of the advance/retreat lever 40. As shown in FIG.

Protrusions 35 , 35 are formed on both sides of the housing portion 31 in the longitudinal direction. The ridges 35, 35 are engaged with grooves 16, 16 formed in the inner wall of the tubular main body 10 in a state in which the magnet holder 30 is inserted into the advancing/retracting space 11 of the tubular main body 10, thereby adjusting the position in the left-right direction. Guided to prevent slippage.

An advance/retreat lever 40 is extended so as to stand from the front of the accommodation portion 31 . The advancing/retreating lever 40 includes a horizontal lever portion 41 that is erected so as to protrude outward from the central position of the front surface of the accommodation portion 31, and an inverted U shape that has an upper side formed from the tip side of the horizontal lever portion 41 as a vertex. It consists of a lever handle portion 42 .

The horizontal lever portion 41 extends the lever handle portion 42 from the vertical opening 15 formed in the tubular body 10 to the outside of the tubular body 10 . Therefore, at least the extension length of the horizontal lever portion has a length equal to or greater than the thickness from the inside to the outside of the tubular body 10 . The widthwise length of the horizontal lever portion 41 is formed slightly shorter than the widthwise length of the vertical opening portion 15, and the horizontal lever portion 41 also functions as a guide for preventing lateral displacement due to the vertical opening portion 15. FIG.

In this embodiment, a horizontal lever portion 41 is formed on the front surface of the housing portion 31, and two ridges 35, 35 are formed on both sides of the housing portion 31, respectively, and the grooves 16, 16 and the vertical opening of the cylindrical main body 10 are formed. 15. As a result, the magnet holding portion 30 is supported at three points in the forward/backward space of the cylindrical main body 10, and stable forward/backward movement in the left-right direction becomes possible.

The lever handle portion 42 is a U-shaped member that is turned upside down, and has a curved portion 43 that curves to both sides with the connection portion with the horizontal lever portion 41 as the apex, and two ends that extend downward from both ends of the curved portion 43 . It consists of two straight portions 44,44. The upper surface of the curved portion 43 is curved on both sides, and the length from one side surface to the other side surface of the curved portion 43 reaches about two-thirds of the diameter of the upper body 10a when viewed from the front (see FIG. 2). The upper surface of the curved portion 43 is inclined downward from the rear side (horizontal lever portion 41 side) to the front side (lower side in FIG. 4). The lever handle portion 42 is for pushing down the magnet holder 30 by putting a user's finger thereon, and the upper portion is a curved portion 43, and the upper surface is inclined forward, thereby facilitating the sliding of the finger. ing. The straight portions 44, 44 of the lever handle portion 42 hang down parallel to the outer wall of the tubular body 10 with a predetermined gap.

A cylindrical inner cylindrical portion 50 extending downward from the lower surface of the accommodating portion 31 of the magnet holder 30 is formed. The inner tubular portion 50 is a tubular body having an outer diameter one size smaller than that of the accommodating portion 31 . One end of a spring 60, which is an elastic body to be described later, is accommodated in the inner cylindrical portion 50 (see FIG. 2).

As shown in FIGS. 2 and 3, the elastic spring 60 is a spring spring in this embodiment. One end of the spring 60 is inserted into the inner cylindrical portion 50 of the magnet holder 30 and brought into contact with the lower surface of the housing portion 31 . , the other end is brought into contact with the inner bottom surface 14 of the tubular body 10 . As a result, the elastic force of the spring 60 can urge the magnet holder 30 to be positioned upward within the advance/retreat space 11 of the tubular body 10 . Note that the elastic body may be something other than a spring, and a plate spring or the like may be used.

As shown in FIGS. 5A and 5B, the adsorption part 70 is a lid that covers (shields) the upper plane of the tubular body 10, and has a substantially trapezoidal cross section that is the same as the outer diameter of the tubular body 10. has an upper member 71 of . The upper member curves downward from the vicinity of the outer peripheral edge, and the outer peripheral edge is flush with the outer peripheral surface of the tubular body 10 .

A projecting piece 72 projecting downward from a part of the outer peripheral edge of the upper member 71 is provided. The lateral width of the protruding piece 72 in a front view is approximately one third of the diameter of the cylindrical main body 10, and the protruding width is approximately equal to the height of the upper member 71 (see FIG. 2). A protruding leg 73 protruding downward in a substantially cylindrical shape is formed from the back surface of the upper member 71 , and a generally circular engaging piece 74 is formed outward from the lower end of the protruding leg 73 . The engaging piece 74 is connected to the protruding piece 72 so as to cut out a portion of the substantially circular shape on the base end side (the center side of the circle). The protruding piece 72 is engaged with the upper portion of the vertical opening 15 of the tubular body 10, and the substantially circular engaging piece 74 is engaged with the engaged piece 17 near the opening surface 12a of the tubular body 10. , the suction portion 70 can be kept engaged with the tubular body 10 and the lid can be closed (see FIG. 3).

Details of the suction unit 70 will be described with reference to FIG. 6 . The upper member 71 of the suction unit 70 has a curved portion 71a, which is a portion curved downward near the outer periphery, and a flat portion 71b, which is the central portion of the curved portion 71a. The back surface of the upper member 71 is formed with a recessed portion 71c that is curved and recessed so that the center point is convex toward the upper surface. The thickness of the adsorption portion 70 is about the same as the thickness of the tubular main body 10, but the thickness at the center position of the upper member 71 is reduced to half or less due to the formation of the recessed portion 71c, and the magnet 33 is brought closer. In addition, the magnet 33 and the attracting portion 70 do not come into direct contact with each other, thereby preventing damage due to impact.

The rear surface of the upper member 71 has a flat rear surface portion 71d located inside the projecting leg 73 and outside the recessed portion 71c. The back plane portion 71d is a portion with which the upper surface of the peripheral wall 34 of the housing portion 31 of the magnet holder 30, which is biased by the spring 60, engages. Except for the magnet 33 and the spring 60, the collecting tool 1 of the present embodiment is made of resin to prevent damage due to direct collision between the magnet 33 and the attracting portion 70. As shown in FIG.

In the collecting tool 1 of the present embodiment, the magnets 33 accommodated by the magnet holders 30 toward the attracting portion are biased by the springs 60 so as to approach the vicinity of the back surface of the attracting portion 70, so that the user can Eraser crumbs attracted by magnetic force can be attracted to the planar portion 71b of the attracting portion 70 and collected. In addition, when the lever handle 42 is put with a finger and the advance/retreat lever 40 is pulled, the magnet 33 moves away from the attracting portion, thereby weakening the magnetic force and allowing the attracted eraser crumbs to be released.

In addition to this, even if the magnet 33 is moved away from the attracting portion 70 by operating the advance/retreat lever, the state where the eraser dust is attracted to the attracting portion 70 may be maintained due to the influence of static electricity or the like. In the collecting tool 1 of this embodiment, when the forward/backward lever 40 is pulled and the finger is slid away from the forward/backward lever, the elastic force of the spring 60 causes the magnet holder 30 to vigorously contact the back surface of the attracting portion 70 . Specifically, the upper plane of the peripheral wall 34 of the housing portion 31 and the back plane portion 71d of the upper member 71 come into contact and collide, and the impact makes it possible to release the eraser dust that is in the sucked state.

In order to separate the eraser crumbs attracted and maintained by static electricity or the like by the impact caused by the collision between the upper plane of the peripheral wall 34 and the back plane portion 71d of the adsorption section, the spring constant of the preferred embodiment is 0.15 N/mm. are used. Experiments with a plurality of spring constants revealed that a spring with a spring constant of 0.09 N/mm could not release eraser crumbs adsorbed to the adsorption unit 70, while a spring with a spring constant of 0.21 N/mm The sticking part 70 is flipped away. Therefore, a suitable spring constant is 0.1 to 0.2 N/mm, more preferably 0.12 to 0.18 N/mm.

As shown in FIG. 7, the collecting tool 1 of this embodiment can be used as a pencil-shaped eraser case by being connected to the rear end of the long axis-shaped eraser case 2 . The lower body 10b of the tubular body 10 of the collecting tool 1 is connected to the inner cylinder of the case for housing the eraser. By pushing down, the eraser 3 which is attracted by magnetic force comes out from the chuck. In this way, it can be used by being connected to one end of the pencil-shaped eraser case 2 .

DESCRIPTION OF SYMBOLS 1... Collection tool 10... Cylindrical main body 11... Retraction space 14... Inner bottom surface 15... Vertical opening 16... Groove 30... Magnet holder 31... Accommodating part 33... Magnet 34... Surrounding wall , 35... Protruding strip 40... Forward/backward lever 41... Horizontal lever part 42... Lever handle part 43... Curved part 44... Straight part 50... Inner cylindrical part 60... Spring (elastic body) 70... Adsorption part 71c... Recess part 71d... Back plane part.

Claims (6)

An eraser crumb collecting tool for attracting and discarding eraser crumbs attracted by magnetic force,
A tubular body having a space for advancing and retreating in the longitudinal direction inside, an adsorption part covering one longitudinal surface of the tubular body, and a magnet holder for holding a magnet and advancing and retreating in the advancing and retreating space of the tubular body. an elastic body for urging the magnet holder toward the back side of the attracting portion; and an advance/retreat lever extending from the magnet holder and arranged outside the cylindrical main body. Waste collection equipment. The magnet holding body has a housing portion for holding the magnet on the upper side by a peripheral wall erected around the magnet, and the surface of the peripheral wall on the side of the attracting portion and the back surface of the attracting portion move forward and backward so as to come into contact with each other. The eraser dust collector according to claim 1, characterized by: The attracting part has a flat back portion on the back surface at a position in contact with the peripheral wall of the magnet holder, and has a concave portion that reduces the thickness of the position where the magnet held by the magnet holder is close to. Item 2. The tool for collecting eraser crumbs according to item 2. The spring, which is an elastic body, has one end supported by the inner bottom surface of the tubular main body and the other end supported by an inner tubular portion extending downward from the bottom surface of the housing portion of the magnet holder,
4. The tool for collecting eraser crumbs according to claim 1, wherein the spring body has a spring constant in the range of 0.1 N/mm to 0.2 N/mm. The advancing/retreating lever is composed of a horizontal lever portion extending from an accommodating portion that accommodates the magnet, and a lever handle portion formed at the tip of the horizontal lever portion,
The cylindrical main body has a vertical opening through which the horizontal lever portion is guided out of the cylinder and moves up and down according to the advance and retreat of the magnet holding portion, and a ridge formed on the magnet holding body. 5. The eraser dust collecting tool according to claim 1, further comprising a groove formed on the inner surface of the tubular body that engages with the eraser dust collecting tool.
The lever handle has a curved portion with the tip of the horizontal lever portion as the apex and both ends reaching straight portions,
6. The eraser crumb collecting tool according to claim 5, wherein the upper plane of said curved portion is downwardly slanted outward from the connecting position with said horizontal lever portion.

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