CN101318427A - Clamping device for loose-leaf binder - Google Patents
Clamping device for loose-leaf binder Download PDFInfo
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- CN101318427A CN101318427A CNA2007101059996A CN200710105999A CN101318427A CN 101318427 A CN101318427 A CN 101318427A CN A2007101059996 A CNA2007101059996 A CN A2007101059996A CN 200710105999 A CN200710105999 A CN 200710105999A CN 101318427 A CN101318427 A CN 101318427A
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- ring
- clamping device
- daughter board
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Abstract
A clamping device used for a flange clip comprises at least one connection plate of a holding cavity, at least one annular substance which is provided with a cut and used for arranging the thin layer substances like flange paper as well as at least one elastic mechanism arranged in the at least one holding cavity of the connection plate; the annular substance is transversely penetrated on the connection plate; the elastic mechanism is collocated to be used for contacting and pressing at least one of the annular substance that is transversely penetrated. When in use, the opening and closing of an annular mechanism can be realized only by manually rotating the annular substance. Manually rotating the annular substance is easy to operate; besides, the annular substance can firmly and sufficiently rotate; the operation is safe; the clamping device used for a flange clip has reliability and practicability. Besides, the clamping device used for a flange clip has simple structure and can realize low cost production.
Description
Technical field
The present invention relates to a kind of clamping device that is used for loose-leaf binder, particularly a kind of have connecting plate and a ring-type mechanism, with the clamping device of the loose-leaf binder that is used to grip many thin layer objects such as loose-leaf paper.
Background technology
Loose-leaf binder is a kind of stationery used in everyday, and it is convenient to file and deposits disaggregatedly.At present, widely used loose-leaf binder comprises top flat board, bottom panel and ridge, above dull and stereotyped be connected by ridge with bottom panel, the middle inside fixture of ridge has clamping device.Existing clamping device generally all has the elongated board of a rigidity, is fixed with the clamping device of a plurality of rings above.Control closing and opening of a plurality of rings by leverage, thereby the multipage loose-leaf paper that will have perforation is fixed in file or the notebook.The user can select to open clamping device, adds or the minimizing paper, also can select required loose-leaf paper is fixed in the file.
The existing clamping device that is used for loose-leaf binder has multiple structure, and such as disclosing a kind of circular ring loose-leaf binder mechanism that is used for fixing the loose-leaf page among the Chinese patent CN2557334Y, this mechanism comprises: an elongated board; Support, be used for doing the articulated slab of pivoting action with respect to this elongated board by above-mentioned plate; The semi-ring of the paired couple positioned opposite of the clamping loose-leaf page, these rings comprise ring-type element, be installed on the articulated slab and or can between a closed position and an open position, move, wherein in the closed position, the ring-type element of each ring forms continuous closed-loop.One control structure is controllably rotated above-mentioned articulated slab, thus between closed position and open position mobile ring-type element.The above-mentioned relative semi-ring of many groups left and right sides makes the semi-ring outer end of both sides form a clasp when joining.Some clamping device is further in order to solve the problem of the dislocation of semi-ring in twos, and the outer end at the semi-ring place of combining is designed to convex-concave shape or hook-bill shape.The deficiency that the clamping device that above-mentioned semi-ring fastens exists is: control device is complicated; Outside the semi-ring junction is exposed to, influence integral aesthetic property; If it is excessive or too fast that the control device that adopts imposes on the external force of ring-type element, the operator is vulnerable to crush, and adopt rough ring edge, and make the operator in the operating process of substituting this document or upset this document, there is the possibility of the incised wound that is subjected to this semi-ring edge.
Another U.S. Pat 4765,768 more approaching with the present invention discloses a kind of ring binder mechanism (a ring binding mechanism), is used to bind photograph album or arranges the document.The bookbinding folder comprises the backboard (a backup member) of the ring (generally c-shaped), base plate (a base plate member), strip of paper used for sealing (a cover) and the bearing plate that are roughly the C type.Base plate comprises that a plurality of built-in slideways with opening part (internal tracks) to receive a plurality of rings, also comprise a limited impression.This slideway is that arc is so that the ring rotation is mobile.Each ring comprises first and second end, and one of them terminal approximate spheroid that is in the ring closed position, inserts and is arranged on base plate in order in the spacing groove.Realize the unlatching of closing of ring by manual rotation.Displacement for anti-stop ring also offers a plurality of projectioies on the ring.Its defective is the contour structures complexity of ring body, is unfavorable for processing and fabricating, and limited impression separates setting with the slideway that built-in being used to encircles rotation, uses inconvenience, not attractive in appearance, the poor reliability of ring folding closed condition.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective, a kind of processing, ring mechanism unlatching security insurance, simple to operate of being easy to is provided, have more the clamping device that is used for loose-leaf binder of practicality, aesthetic property, reliability.
For achieving the above object, the invention provides following technical scheme:
A kind of clamping device that is used for loose-leaf binder comprises connecting plate with at least one containing cavity, has at least one elastic mechanism of placing at least one ring of loose-leaf thin layer object and being positioned at least one containing cavity of connecting plate of being used to of opening; Described at least one ring laterally is located on the described connecting plate; Described at least one elastic mechanism respectively is configured to one of described at least one ring that is horizontally through in order to contact and compressing.
In one embodiment of the present invention, described at least one elastic mechanism respectively comprises spring and limiting section; Described limiting section is positioned at the spring outer end, matches with the opening of a described ring, so that described ring is spacing.
In one embodiment of the present invention, described limiting section is the gag lever post that spheroid or front end have the spherical surface body shape, and the spherical surface body of described spheroid or gag lever post holds the outer end of the spring under compressive state, contacts and oppress described ring under spring promotes.
The spherical surface body of described spheroid or described gag lever post is arranged to, and under the compressing of described spring, the spherical surface body front end of described spheroid or described gag lever post engages with the opening that revolves through so far ring, is partially submerged into to the opening of described ring.
In one embodiment of the present invention, described elastic mechanism is the spacing member of elasticity, described member has a projection and two and is bent the elastic arm that extends to form by described projection laterally, for example " } " shape, described projection contacts and oppresses described ring under the promotion of described two elastic arms.
The projection of the spacing member of described elasticity is under the elastic force of described two elastic arms promotes, and described projection engages with the opening that revolves through so far ring, is partially submerged into to the opening of described ring.
In one embodiment of the present invention, described connecting plate punishes to be slit into passing of at least one ring has the independent end face first daughter board body and the second daughter board body, wherein the end face of close described at least one ring of the first daughter board body offers a horizontal arc opening groove, pass to hold described ring, and end face extends internally and sets out the containing cavity of described elastic mechanism thus.
The end face of close described at least one ring of the described second daughter board body is arranged to and can be combined closely with the first daughter board body.
In one embodiment of the present invention, described connecting plate punishes to be slit into passing of at least one ring has the independent end face first daughter board body and the second daughter board body, wherein the end face of close described at least one ring of the first daughter board body offers a horizontal arc opening groove, pass to hold described ring, being extended internally by the end face of close described at least one ring of the described second daughter board body sets out the containing cavity of described elastic mechanism.
The end face of close described at least one ring of the described first daughter board body is arranged to and can be combined closely with the second daughter board body.
Technique scheme disclosed in this invention only needs manually rotation ring during use, can realize the opening and closing of ring opening.When rotating to the ring opening when appearing, can be chosen in opening part and dose or reduce loose-leaf thin layer object, for example paper; If select the ring opening is closed, can be with the ring opening to connecting plate direction rotation, when opening during, under the effect of the elastic force of spring (shell fragment) through the limiting section of elastic mechanism front end in the containing cavity, limiting section is fastened on the opening part of ring, thereby with the fixed-site of ring.
Advantage of the present invention:
When 1, selecting ring to close, the opening of ring has been threaded in connecting plate, is in concealed location, and outside feasible being exposed to is a ring continuous, complete, attractive in appearance, particularly when stirring loose leaf paper, can avoid loose leaf paper to be scratched.Simultaneously, hidden ring opening and smooth open end, avoided half generation, also avoided the generation of the situation of thin layer object such as the existing easy generation damage paper of existing paired semi-ring engagement loose-leaf binder mechanism and operator's hand ring engagement misalignment
2, ring matches with an elastic mechanism, the chimeric ring of realizing by ring opening and limiting section is spacing, it is simple in structure, operation is easily gone, not only ring can be in groove firmly, rotate fully, and the handling safety insurance, prevent situations such as thin layer objects such as scratching the loose-leaf paper and hand are crushed.
3, clamping device provided by the present invention can lock the position of ring reliably when being used for fixing thin layer objects such as loose-leaf paper, thereby prevents that thin layer objects such as paper from losing unexpectedly, has reliability and practicality.
4, clamping device provided by the invention is simple in structure, can realize low-cost production.
Description of drawings
Fig. 1 is a user mode stereogram of the present invention, and clamping device wherein is fixed in the inboard of loose-leaf binder, has shown that the opening of ring is in different positions respectively;
Fig. 2 is the stereogram of the embodiment of the invention one;
Fig. 3 is along the drawing in side sectional elevation of 3-3 line among Fig. 2;
Fig. 4 is along the drawing in side sectional elevation of 4-4 line among Fig. 2;
Fig. 5 is a three-dimensional exploded view of the present invention;
Fig. 6 is the three-dimensional exploded view of another embodiment of the present invention.
Fig. 7 is along the drawing in side sectional elevation of 7-7 line among Fig. 2.
The specific embodiment
Further describe technical scheme of the present invention below in conjunction with accompanying drawing by embodiment.
As shown in Figure 1, clamping device of the present invention is used for loose-leaf binder, and loose-leaf binder is used for thin layer objects such as loose-leaf paper are fixed in file or the notebook as perforated paper, to realize dosing, extracting and fixing thin layer objects such as some loose-leaves paper.Loose-leaf binder 100 shown in the figure is a pattern commonly used, flat board 104, following dull and stereotyped 102 and ridge 106 above its shell comprises, clamping device 300 is fixed in the inboard of ridge 106, and its fixedly connected mode can adopt prior art, such as adopting the fixing mode of rivet.Shown in Fig. 2,3,4,5, a kind of clamping device 200 that is used for above-mentioned loose-leaf binder is made up of connecting plate 300, the first annulus 402L, the second annulus 402R, the first elastic mechanism 500L and the second elastic mechanism 500R.
Connecting plate 300 is the elongated rectangle plate with rigidity, can have the material of enough rigidity by metal or other, also can be that rigid plastics, plastic-aluminum alloy material can provide the stable lighter material of while weight of installing to make like this.Further with reference to figure 3,4,5, connecting plate is equipped with the first annulus 402L and the second annulus 402R in two ends about in the of 300, and whole connecting plate 300 is divided into a body portion 302, first end 304L and the second end 304R.Two end faces of wherein said body 302 respectively are provided with a horizontal deep-slotted chip breaker, are respectively the first horizontal deep-slotted chip breaker 306L and the second horizontal deep-slotted chip breaker 306R, make it free smooth passing in order to hold the described first annulus 402L and the second annulus 402R respectively.And be that a containing cavity is respectively offered at the center inwardly with the central axis of described connecting plate 300 by two end faces of described body 302, be respectively the first containing cavity 308L and the second containing cavity 308R, in order to the ccontaining first elastic mechanism 500L and the second elastic mechanism 500R, the cross section of these two containing cavity 308L and 308R is circular respectively.The end face near the second annulus 402R near the end face of the first annulus 402L and the second end 305R of first end 304L is arranged to the shape that can fit tightly with described body 302.Combining between the body 302 of above-mentioned connecting plate and first end and the second end, under the prerequisite of the setting that does not influence the above-mentioned first horizontal deep-slotted chip breaker 306L and the second horizontal deep-slotted chip breaker 306R and the first containing cavity 308L and the second containing cavity 308R, can also select other different secure bond mode.Bonding mode, chimeric mode or screw are fixedly connected such as adopting.Only be schematic diagram in the technical scheme shown in the invention process illustration, wherein do not show the connected mode of connecting plate and loose-leaf binder.In the production of reality was implemented, connecting plate 300 can adopt prior art with the fixed form of loose-leaf binder, such as offering fixing hole on the body of connecting plate and two ends, adopted rivet to be fixed on the loose-leaf binder; Can also fix a support plate (not shown) below connecting plate 100, connecting plate is fixedly mounted on the support plate, fixedlys connected with loose-leaf binder by support plate again.The annexation of connecting plate and loose-leaf binder among the present invention can adopt fully that all can use the mode of enforcement in the prior art, not only is confined to two kinds of connected modes recited above, is not described in further detail at this.
The described first annulus 402L and the second annulus 402R are used to place thin layer objects such as loose-leaf paper, laterally be located on the connecting plate 300, and can rotate freely respectively among the movable first horizontal deep-slotted chip breaker 306L and the second horizontal deep-slotted chip breaker 306R set in connecting plate 300 bodies.Any place at the circumference of the described first annulus 402L and the second annulus 402R is offered the first opening 404L and the second opening 404R respectively, makes the described first annulus 402L and the second annulus 402R have two ends respectively, forms c-shaped substantially open ring.For the opening and closing position of the described first annulus 402L of the present invention and the second annulus 402R is described, outside the first opening 404L that has shown the first annulus 402L that is in connecting plate upper end in Fig. 1 is exposed to, make state that the described first annulus 402L is in unlatching in order to increase or to reduce thin layer object such as paper; The second opening 404R of the second annulus 402L that is in the connecting plate lower end is then hidden in connecting plate, makes the described second annulus 402R in the closed position in order to fixing thin layer object such as paper.The making of the described first annulus 402L and the second annulus 402R can be adopted suitable material, comprises metal and rigid plastics.For temporary file or microfolio, can only have an annulus.Certainly, the mechanism that has greater than the ring of varying numbers such as two or three, four does not depart from the scope of the present invention yet.
The described first elastic mechanism 500L comprises the first spring 502L and the first limiting component 504L, is arranged in the first containing cavity 308L; The described second elastic mechanism 500R comprises the second spring 502R and the second limiting component 504R, is arranged in the second containing cavity 308R.Its first limiting component 504L and the second limiting component 504R are respectively in order to contact and to oppress the described first annulus 402L and the second annulus 402R.The described first spring 502L shown in Fig. 3 and Fig. 5 and the second spring 502R are spiral compression spring, and the described first limiting component 504L and the second limiting component 504R are spheroids, can adopt suitable material, comprise the making of metal and rigid plastics.This first spheroid 504L holds the outer end at the first spring 502L, under promoting, the first spring 502L contacts and oppresses the described first annulus 402L, equally, the second spheroid 504R holds in the outer end of the second spring 502R, contacts and oppress the described second annulus 402R under the second spring 502R promotes.The diameter of the wherein said first spheroid 504L and the second spheroid 504R is slightly larger than the first opening 404L of the described first annulus 402L and the second opening 404R of the second annulus 402R respectively, when making the first opening 404L through the described first spheroid 504L by rotating the first annulus 402L, the front end of the first spheroid 504L is at the first opening 404L of the described first annulus 402L of the embedding of the compressing lower part of the described first spring 502L, thereby makes the first annulus 402L in the closed position.Equally, also can make second annulus also be in the position of closing by the way.
The first above-mentioned limiting component 504L and the second limiting component 504R also can adopt front end to have the gag lever post (not looking among the figure) of spherical surface body shape, the gag lever post lower end is contained in the spring, the end of its spherical surface body shape holds the outer end of the spring under compressive state, under spring promoted, the spherical surface body contact of gag lever post front end was also oppressed described ring.Under the general situation, the spring of two kinds of above-mentioned forms and limiting component are two parts, the chimeric outer end that holds at spring of limiting component.Add man-hour, also can adopt integral production, be about to limiting component and spring once-forming; Perhaps split production welds or is bonded as one.
As shown in Figure 6 and Figure 7, the present invention also provides the clamping device with another elastic mechanism.A kind of clamping device that is used for above-mentioned loose-leaf binder by connecting plate 300, the first annulus 402L, the second annulus 402R and two elastic mechanisms 600, is shaped as " } " shape, i.e. spacing member of first elasticity and the spacing member of second elasticity.The spacing member of described first elasticity comprise the first projection 606L and along described projection 606L two ends extended two elastic arm 604L, and the spacing member of second elasticity comprises the second projection 606R and extended two elastic arm 604R along described projection 606R two ends.Described first projection and second projection are arrow shape projection.Any place of the circumference of described two annulus 402L and 402R is offered an opening respectively, the first opening 404L and the second opening 404R.Connecting plate is equipped with the first annulus 402L and the second annulus 402R in two ends about in the of 300, and whole connecting plate 300 is divided into a body portion 302, first end 304L and the second end 304R.
The close respectively first annulus 402L of wherein said first end 304L and the second end 304R and two end faces of the second annulus 402R respectively are provided with a horizontal deep-slotted chip breaker, make it free smooth passing in order to hold the described first annulus 402L and the second annulus 402R respectively.And be that a containing cavity is respectively offered at the center inwardly with the central axis of described connecting plate 300 by two end faces of described body 302, be respectively the first containing cavity 310L and the second containing cavity 310R, respectively in order to spacing member of ccontaining first elasticity and the spacing member of second elasticity.The shape of the first containing cavity 310L and the second containing cavity 310R is complementary with spacing member of first elasticity and the spacing member of second elasticity respectively, enables to hold respectively spacing member of first elasticity and the spacing member of second elasticity.
Spacing member of described first elasticity and the spacing member of second elasticity are placed on respectively in the first containing cavity 310L and the second containing cavity 310R, and make the first containing cavity 310L and the second containing cavity 310R can push two elastic arms of spacing member of first elasticity and the spacing member of second elasticity respectively, so that two elastic arms force corresponding projection forward.When by rotate the first annulus 402L make the first opening 404L through described first " during the projection 606L of the spacing member of elasticity; the front end of the projection 606L of the spacing member of first elasticity is at the first opening 404L of the described first annulus 402L of the embedding of the compressing lower part of described two elastic arm 604L; thus make the first annulus 402L in the closed position; same; as also can to make second annulus also be in the position of closing by the way.
Except the embodiment of above-described connecting plate 300 provided by the invention, deep-slotted chip breaker on the connecting plate and containing cavity can be provided with the diverse location of body and end as required.Because deep-slotted chip breaker is identical with structure shown in the foregoing description and the accompanying drawing with containing cavity, only be the position difference, so the present invention does not provide corresponding accompanying drawing.Now to be equipped with a ring on the connecting plate, described connecting plate is divided into a body portion and an end is an example, the location schemes on connecting plate is summarized as follows with deep-slotted chip breaker and containing cavity:
Scheme 1: the body of connecting plate with the close end face of described ring a horizontal arc opening groove is set, pass to hold ring, and end face inwardly sets out a containing cavity thus, in order to hold elastic mechanism.Being arranged to and combining closely with described body end face the end with the mutually close end face of described ring.
Scheme 2: the body of connecting plate with the close end face of described ring a horizontal arc opening groove is set, pass to hold ring, inwardly set out a containing cavity by the end face of the close described ring of end, in order to hold elastic mechanism.The described end face of wherein said end and the described end face of described body are arranged to and can be combined closely.
Scheme 3: the end of connecting plate with the close end face of described ring a horizontal arc opening groove is set, pass to hold ring, and end face inwardly sets out a containing cavity thus, in order to hold elastic mechanism.Wherein body is arranged to and can combines closely with described end face end face with the mutually close end face of described ring.
Scheme 4: the end of connecting plate with the close end face of described ring a horizontal arc opening groove is set, pass to hold ring, inwardly set out a containing cavity by the end face of the close described ring of body, in order to hold elastic mechanism.The described end face of wherein said end and the described end face of described body are arranged to and can be combined closely.
Need to prove, above-described embodiment with connecting plate of two annulus, wherein clear for convenience of description, be divided into according to the position relation of two parts of connecting plate and be called body and end, but can not be interpreted as that this title is the restriction to connecting plate of the present invention.When the present invention adopted three rings or three above rings, each ring is same as above at the place of wearing to be divided into two plate bodys with connecting plate.
More than by embodiment to the specific descriptions that the present invention did, be not to do further to limit to content of the present invention.Should be understood that those skilled in the art can do a lot of replacements, change, improvement or change to the technical characterictic of content of the present invention, do not break away from spirit of the present invention, still belong within protection scope of the present invention.
Claims (10)
1, a kind of clamping device that is used for loose-leaf binder comprises connecting plate with at least one containing cavity, has at least one elastic mechanism of placing at least one ring of loose-leaf thin layer object and being positioned at described at least one containing cavity of being used to of opening; Described at least one ring laterally is located on the described connecting plate; One of each described at least one ring that is horizontally through with its elastic force contact and compressing of described at least one elastic mechanism.
2, clamping device as claimed in claim 1 is characterized in that: described at least one elastic mechanism respectively comprises spring and limiting section; Described limiting section is positioned at the spring outer end, matches with the opening of one of described at least one ring, so that one of described at least one ring is spacing.
3, clamping device as claimed in claim 2, it is characterized in that: described limiting section is the gag lever post that spheroid or front end have the spherical surface body shape, the spherical surface body of described spheroid or gag lever post holds the outer end of the spring under compressive state, contacts and oppress one of described at least one ring under spring promotes.
4, clamping device as claimed in claim 3, it is characterized in that: the spherical surface body of described spheroid or described gag lever post is arranged to, under the compressing of described spring, the spherical surface body front end of described spheroid or described gag lever post engages with the opening that revolves through so far ring, is partially submerged into to the opening of one of described at least one ring.
5, clamping device as claimed in claim 1, it is characterized in that: described at least one elastic mechanism respectively is the spacing member of elasticity, the spacing member of described elasticity has a jut and two elastic arms that are the extension of angle ground by described jut backward and each other, the elastic arm end outwards opens so that be clamped in the connecting plate, and described projection contacts and oppress one of described at least one ring under the promotion of described two elastic arms.
6, clamping device as claimed in claim 5 is characterized in that: the projection of the spacing member of described elasticity engages with the opening that revolves through so far described at least one ring under the promotion of described two elastic arms, is partially submerged into to the opening of described ring.
7, as any described clamping device among the claim 1-6, it is characterized in that: described connecting plate is slit into the first daughter board body and the second daughter board body with independent end face in the punishment of passing of each at least one ring, wherein the end face near each described at least one ring of the first daughter board body offers a horizontal arc opening groove, pass to hold described ring, and end face extends internally and sets out the containing cavity of each described at least one elastic mechanism thus.
8. clamping device as claimed in claim 7 is characterized in that: the end face of close described at least one ring of the described second daughter board body is arranged to and can be combined closely with the first daughter board body.
9, as any described clamping device among the claim 1-6, it is characterized in that: described connecting plate is slit into the first daughter board body and the second daughter board body with independent end face in the punishment of passing of each described at least one ring, wherein the end face of one of close described at least one ring of the first daughter board body offers a horizontal arc opening groove, pass to hold one of described at least one ring, being extended internally by the end face of one of close described at least one ring of the described second daughter board body sets out the containing cavity of each described at least one elastic mechanism.
10, clamping device as claimed in claim 9 is characterized in that: the end face of one of close described at least one ring of the described first daughter board body is arranged to and can be combined closely with the second daughter board body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101059996A CN101318427A (en) | 2007-06-05 | 2007-06-05 | Clamping device for loose-leaf binder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101059996A CN101318427A (en) | 2007-06-05 | 2007-06-05 | Clamping device for loose-leaf binder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101318427A true CN101318427A (en) | 2008-12-10 |
Family
ID=40178787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101059996A Pending CN101318427A (en) | 2007-06-05 | 2007-06-05 | Clamping device for loose-leaf binder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101318427A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102431343A (en) * | 2011-12-27 | 2012-05-02 | 南京卡莱福数码科技有限公司 | Loose-leaf binder |
| CN110843379A (en) * | 2019-12-20 | 2020-02-28 | 兰州理工大学 | Loose-leaf binding device |
-
2007
- 2007-06-05 CN CNA2007101059996A patent/CN101318427A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102431343A (en) * | 2011-12-27 | 2012-05-02 | 南京卡莱福数码科技有限公司 | Loose-leaf binder |
| CN110843379A (en) * | 2019-12-20 | 2020-02-28 | 兰州理工大学 | Loose-leaf binding device |
| CN110843379B (en) * | 2019-12-20 | 2024-04-12 | 兰州理工大学 | Loose-leaf binding device |
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Open date: 20081210 |