CN204367669U

CN204367669U - The adjustable blackboard of multi-angle

Info

Publication number: CN204367669U
Application number: CN201420857154.8U
Authority: CN
Inventors: 杨金花; 曹清; 黄超
Original assignee: Changshu Institute of Technology
Current assignee: Changshu Institute of Technology
Priority date: 2014-12-30
Filing date: 2014-12-30
Publication date: 2015-06-03
Anticipated expiration: 2024-12-30

Abstract

The adjustable blackboard of a kind of multi-angle, belongs to teaching equipment technical field.Comprise bearing support, it comprises bearing support crossbeam, the first and second outer support pipes; A pair walking mechanism, is connected with the bottom of first, second outer support pipe respectively; Height adjustment bracket, it comprises and highly regulates crossbeam, the first and second inner sleeves; First, second trailing arm, respectively with the upper end thereof of first, second inner sleeve; First and second blackboard plate bodys, the first blackboard plate body is bearing on the first trailing arm towards the side of the first trailing arm, and the second blackboard plate body is bearing on the second trailing arm towards the side of the second trailing arm, and both sides are in opposite directions articulated and connected each other; Angle adjusting mechanism, it is connected between first, second blackboard plate body.Can meet be positioned at dead ahead and the crowd occupying back seat observes requirement; Avoid the observing effect affecting the crowd occupying both sides because of reflective; Tackle flexible instructions for use; Be convenient to collection; Structure is simple, manufactures with easy to use.

Description

The adjustable blackboard of multi-angle

Technical field

The utility model belongs to teaching equipment technical field, is specifically related to the adjustable blackboard of a kind of multi-angle.

Background technology

Blackboard in prior art is commonly the single plate body of integral type, in the use procedure of reality, inconvenience is moved because of heavy, especially large in place of giving lessons and the occasion that personnel are many, being difficult to even without failing to see clearly the content that blackboard is write because of factors such as the angle between observer present position and blackboard, distances, affecting teaching efficiency.In addition, due to bulky, be both difficult to mobile, inconvenience is concealed in stand-by state again.

The technical information of the blackboard with regulatory function can be seen in disclosed Chinese patent literature, as document A). publication number CN101519013A recommends to be had " reflection prevention blackboard with adjusting angle ", blackboard is divided into left blackboard and right blackboard (i.e. left plate body and right panel body) by this patent formula, between left and right blackboard, column is set, column is arranged and is used for the hinge hinged with left and right blackboard.The technical essential of this patent respectively arranges an angle regulator on left and right blackboard, and left and right blackboard in use can be made to change relative to the angle between body of wall by the operation to angle regulator, to avoid reflective, impact is observed.One of not enough, be carrier owing to not breaking away from body of wall, thus cannot meet the requirement of upper and lower displacement adjustment; Two, the complex structure of angle regulator, and the connection between body of wall bothers; Three, not there is maneuverability, such as, cannot move; Four, owing to being provided with middle standing pillar between left and right blackboard, thus in use can produce serious interference effect; Its five, owing to being carrier with body of wall, be thus unfavorable for safeguard.And for example document B). Authorization Notice No. CN202911380U provides " folding blackboard ", this patent formula is for aforementioned CN101519013A, due to a pair telescope support be instead of angle regulator, and adopt rotating shaft to realize each other hinged between left and right blackboard, therefore in overall structure, comparatively the former simplifies to some extent, but substantially still there is the aforementioned deficiency of CN101519013A.For another example document C). Authorization Notice No. CN203198511U introduces to be had " blackboard of adjustable-angle ", by the two ends on the top of the length direction of blackboard, each and hydraulic means is fixed, a pair hydraulic means is arranged on body of wall, by the two supports of the bottom of the length direction of blackboard on crotch.During use, namely when forward leaning angle adjustment will be done to blackboard, then by user, hydraulic means is operated.Although this patent formula can embody the technique effect that the 0010th section, all the other descriptions are recorded, there is following shortcoming, one, be the design concept of carrier owing to not breaking away from body of wall, thus cannot do the adjustment of short transverse to blackboard; Its two, owing to have employed a pair hydraulic means, thus not only cost is high, and manufactures with installation and safeguard and all comparatively bother; Its three, not there is mobility, be not easy to be concealed in stand-by state; Its four, owing to only can do the adjustment of top rake angle to blackboard, thus for being in blackboard both sides and the content that cannot see clearly on blackboard because of reflective reason of distance blackboard observer relatively far away.

For above-mentioned prior art, be necessary to be improved, the applicant has done useful design for this reason, defines technical scheme described below.

Summary of the invention

Task of the present utility model be to provide a kind of contribute to using blackboard plate body up-down adjustment meet be positioned at blackboard plate body dead ahead and the crowd occupying back seat observes requirement, be conducive to using in multi-angle range regulation the observing effect avoiding the crowd occupying blackboard plate body both sides because of reflective impact on blackboard plate body, be of value to and embody good mobility and use satisfied flexible instructions for use, have and be convenient to be concealed in stand-by state and use to avoid taking up room with doing nothing and be of value to and simplify structure and easy to use and use the adjustable blackboard of multi-angle embodying economy and practicality.

Task of the present utility model has been come like this, the adjustable blackboard of a kind of multi-angle, comprise a bearing support, this bearing support comprises a bearing support crossbeam, one first outer support pipe and one second outer support pipe, the left end of the first outer support pipe and bearing support crossbeam is fixed, and the second outer support pipe and the first outer support pipe longitudinally walk abreast and fix with the right-hand member of bearing support crossbeam; A pair walking mechanism, this is connected the bottom of one of them walking mechanism in walking mechanism with described first outer support pipe, and this is connected the bottom of another walking mechanism in walking mechanism with described second outer support pipe; One height adjustment bracket, this height adjustment bracket comprises and highly regulates crossbeam, the first inner sleeve and the second inner sleeve, the upper end of the first inner sleeve with highly regulate the left end of crossbeam to fix, and the lower end of the first inner sleeve and the first described outer support pipe are slidably matched, second inner sleeve and the first inner sleeve are longitudinally parallel, the upper end of this second inner sleeve with highly regulate the right-hand member of crossbeam to fix, and the lower end of the second inner sleeve and the second described outer support pipe are slidably matched; One first trailing arm and one second trailing arm, the upper end thereof of the first trailing arm and described first inner sleeve, the upper end thereof of the second trailing arm and described second inner sleeve; One first blackboard plate body and one second blackboard plate body, first blackboard plate body is bearing on the first trailing arm towards the side of described first trailing arm slidably, second blackboard plate body is bearing on the second trailing arm slidably towards the side of described second trailing arm, and the side in opposite directions of first, second blackboard plate body is articulated and connected each other; One angle adjusting mechanism, this angle adjusting mechanism is connected between first, second blackboard plate body in the position of the bottom of the side in opposite directions corresponding to first, second blackboard plate body.

In a specific embodiment of the present utility model, be equipped in the upper end of the first described outer support pipe one for described height adjustment bracket first inner sleeve locking the first lock screw, and be equipped in the upper end of the second described outer support pipe one for described second inner sleeve locking the second lock screw.

In another specific embodiment of the present utility model, a pair described walking mechanism respectively comprises a walking beam and a pair road wheel, a walking beam connecting shaft hole is offered at the middle part of the length direction of walking beam, a pair road wheel respectively pivotable is arranged on the two ends of walking beam, a connection bearing pin is respectively fixed with in the bottom of the first described outer support pipe and the second outer support pipe, a clamping piece is equipped at connecting pin the tip of the axis, described walking beam connecting shaft hole be connected bearing pin and match, and to be limited by described clamping piece.

In another specific embodiment of the present utility model, described bearing support crossbeam, the first outer support pipe and the second outer support pipe are the rectangular or foursquare hollow tube of shape of cross section.

In another specific embodiment of the present utility model, offer one first hinged pin-and-hole in the upper end of the first described inner sleeve, this first hinged pin-and-hole is equipped with one first swivel pin; On the first described trailing arm and the middle position being positioned at the short transverse of the first trailing arm is fixed with the first trailing arm hinged seat, this the first trailing arm hinged seat offers the hinged bore of the first trailing arm, the hinged bore of this first trailing arm is corresponding with described first hinged pin-and-hole, by described first swivel pin insert in the hinged bore of the first trailing arm make the first trailing arm and the first inner sleeve hinged; Offer one second hinged pin-and-hole in the upper end of described second inner sleeve, this second hinged pin-and-hole is equipped with one second swivel pin; On the second described trailing arm and the middle position being positioned at the short transverse of the second trailing arm is fixed with the second trailing arm hinged seat, this the second trailing arm hinged seat offers the hinged bore of the second trailing arm, the hinged bore of this second trailing arm is corresponding with described second hinged pin-and-hole, by described second swivel pin insert in the hinged bore of the second trailing arm make the second trailing arm and the second inner sleeve hinged.

Also have in a specific embodiment of the present utility model, one first trailing arm bending part is respectively configured with in the top and bottom of the first described trailing arm, first trailing arm bending part is configured with one first slide-and-guide flange, and described first blackboard plate body is bearing on the first slide-and-guide flange towards the side of the first trailing arm slidably; One second trailing arm bending part is respectively configured with in the top and bottom of the second described trailing arm, second trailing arm bending part is configured with one second slide-and-guide flange, and described second blackboard plate body is bearing on the second slide-and-guide flange towards the side of the second trailing arm slidably; The side in opposite directions of first, second blackboard plate body described connects each other by hinge.

More of the present utility model and in a specific embodiment, on the top surface and basal surface of the side of described first trailing arm, respectively offer one first sliding tray at described first blackboard plate body, the first described slide-and-guide flange matches with this first sliding tray; On the top surface and basal surface of the side of the second trailing arm, respectively offer one second sliding tray at described second blackboard plate body, the second described slide-and-guide flange matches with this second sliding tray.

In an of the present utility model and then specific embodiment, described angle adjusting mechanism comprises first, second screw and adjustment sheet, first screw is fixed on the bottom of described first blackboard plate body towards the side of the second blackboard plate body, second screw is fixed on the bottom of the second blackboard plate body towards the side of the first blackboard plate body, adjustment sheet offers an adjustment film trap, and the first described screw and the second screw probe into and regulate film trap and limit by the first nut screwed on the first screw and by the second nut screwed on the second screw.

Of the present utility model again more and in a specific embodiment, described clamping piece is split pin or jump ring.

In an again of the present utility model and then specific embodiment, under described first blackboard plate body using state, the bottom of the length direction of side is toward the outside configured with one first pen placing groove; Under described second blackboard plate body using state, the bottom of the length direction of side is toward the outside configured with one second pen placing groove.

One of technique effect of the technical scheme that the utility model provides, realizes up-down adjustment by height adjustment bracket together with first, second trailing arm and first, second blackboard plate body, can meet be positioned at dead ahead and the crowd occupying back seat observes requirement; Two, regulated by the angle of angle adjusting mechanism to first, second blackboard plate body, be conducive to the observing effect avoiding affecting the crowd occupying both sides because of reflective; Three, embody good mobility by walking mechanism, to tackle flexible instructions for use; Four, have be convenient to be concealed in stand-by state and avoided inaction occupy space; Five, overall structure is simple, manufactures with easy to use.

Accompanying drawing explanation

Fig. 1 is example structure figure of the present utility model.

Detailed description of the invention

In order to enable the auditor of Patent Office especially the public clearly understand technical spirit of the present utility model and beneficial effect, applicant will elaborate below by way of example, but not all the restriction to the utility model scheme to the description of embodiment, any according to being only pro forma but not substantial equivalent transformation and all should being considered as the technical solution of the utility model category done by the utility model design.

Everyly in the following description relate to upper and lower, left and right, the concept of directionality (or claim directionality) of front and rear is all for the location status residing for the figure be described, object is to facilitate public understanding, thus can not be understood as being particularly limited to the technical scheme that the utility model provides.

Refer to Fig. 1, the structural system of the adjustable blackboard of the multi-angle that the utility model provides is as follows: comprise a bearing support 1, this bearing support 1 comprises bearing support crossbeam 11,1 first outer support pipe 12 and an one second outer support pipe 13, first outer support pipe 12 is fixed with the left end of bearing support crossbeam 11, and the second outer support pipe 13 and the first outer support pipe 12 longitudinally walk abreast and fix with the right-hand member of bearing support crossbeam 11; One corresponding walking mechanism 2, this is connected with the bottom of the first outer support pipe 12 one of them in a walking mechanism 2 i.e. walking mechanism in left side, and this is connected with the bottom of the second outer support pipe 13 another in a walking mechanism 2 i.e. walking mechanism on right side; One height adjustment bracket 3, this height adjustment bracket 3 comprises highly adjustment crossbeam 31, first inner sleeve 32 and the second inner sleeve 33, the upper end of the first inner sleeve 32 with highly regulate the left end of crossbeam 31 to fix, and the lower end of the first inner sleeve 32 and the first outer support pipe 12 are slidably matched, second inner sleeve 33 and the first inner sleeve 32 are longitudinally parallel, the upper end of this second inner sleeve 33 with highly regulate the right-hand member of crossbeam 31 to fix, and the lower end of the second inner sleeve 33 and the second outer support pipe 13 are slidably matched; The upper end thereof of one first trailing arm 4 and one second trailing arm 5, first trailing arm 4 and the first inner sleeve 32, the upper end thereof of the second trailing arm 5 and described second inner sleeve 5; One first blackboard plate body 6 and one second blackboard plate body 7, first blackboard plate body 6 is bearing on the first trailing arm 4 towards the side (diagram left side) of the first trailing arm 4 slidably, second blackboard plate body 7 is bearing on the second trailing arm 5 slidably towards the side (diagram right side) of the second trailing arm 5, and the side in opposite directions of first, second blackboard plate body 6,7 is articulated and connected each other; One angle adjusting mechanism 8, this angle adjusting mechanism 8 is connected between first, second blackboard plate body 6,7 in the position of the bottom of the side in opposite directions corresponding to first, second blackboard plate body 6,7.

As shown in Figure 1, the shape of whole bracing frame 1 is substantially in H-shaped, and the shape of height adjustment bracket 3 substantially in portal frame.

Be equipped with one in the upper end of aforesaid first outer support pipe 12 for regulating the first lock screw 121 of the first inner sleeve 32 locking of support 3 to aforementioned height, and be equipped with one in the upper end of aforesaid second outer support pipe 13 for the second lock screw 131 to aforementioned second inner sleeve 33 locking.As preferred scheme, solid welding one first lock screw nut 1211 on the first outer support pipe 12, solid welding one second lock screw nut 1311 on the second outer support pipe 13, first, second lock screw 121,131 matches with first, second lock screw nut 1211,1311 respectively.

Aforesaid a pair walking mechanism 2 respectively comprises walking beam 21 and a pair road wheel 22, a walking beam connecting shaft hole 211 is offered at the middle part of the length direction of walking beam 21, a pair road wheel 22 is respectively arranged on the two ends of walking beam 21 by walking wheel seat 221 pivotable, a connection bearing pin 9 is respectively fixed with in the bottom of aforesaid first outer support pipe 12 and the second outer support pipe 13, a clamping piece 91 is equipped at the end connecting bearing pin 9, walking beam connecting shaft hole 211 be connected bearing pin 9 and match, and to be limited by clamping piece 91.As preferred scheme, a pair road wheel 22 adopts the universal wheel with brake gear.When aforesaid connection bearing pin 9 connects on bearing pin 9 through being set to by clamping piece 91 after walking beam connecting shaft hole 211, be separated with connection bearing pin 9 to prevent walking beam 21.

Aforesaid clamping piece 91 both can be split pin, also can be jump ring, and the present embodiment, owing to selecting the latter, is thus provided with jump-ring slot 92 on connection bearing pin 9.If use split pin to fill the post of clamping piece 91, so change jump-ring slot 92 into cotter-pin hold.

Preferably, aforesaid bearing support crossbeam 11, first outer support pipe 12 and the second outer support pipe 13 are shape of cross section is foursquare hollow tube; It is foursquare hollow tube that aforesaid height-regulating slot beam 31, first inner sleeve 32 and the second inner sleeve 33 are shape of cross section.Certainly, if foursquare hollow tube to be changed into the hollow tube of rectangle, so should be considered as equivalent substitution and still belong to technology contents category disclosed in the utility model.

Please continue to refer to Fig. 1, offer one first hinged pin-and-hole 321 in the upper end of aforesaid first inner sleeve 32, this first hinged pin-and-hole 321 is equipped with one first swivel pin 3211; On aforesaid first trailing arm 4 and the middle position being positioned at the short transverse of the first trailing arm 4 is fixed with the first trailing arm hinged seat 41, this the first trailing arm hinged seat 41 offers the hinged bore 411 of the first trailing arm, the hinged bore of this first trailing arm 411 is corresponding with the first hinged pin-and-hole 321, inserts in the hinged bore of the first trailing arm 411 make the first trailing arm 4 realization hinged with the first inner sleeve 32 by the first swivel pin 3211; Offer one second hinged pin-and-hole 331 in the upper end of aforementioned second inner sleeve 33, this second hinged pin-and-hole 331 is equipped with one second swivel pin 3311; On aforesaid second trailing arm 5 and the middle position being positioned at the short transverse of the second trailing arm 5 is fixed with the second trailing arm hinged seat 51, this the second trailing arm hinged seat 51 offers the hinged bore 511 of the second trailing arm, the hinged bore of this second trailing arm 511 is corresponding with the second hinged pin-and-hole 331, inserts in the hinged bore of the second trailing arm 511 make the second trailing arm 5 realization hinged with the second inner sleeve 33 by aforementioned second swivel pin 3311.According to professional general knowledge, clamping piece (specifically as the explanation to clamping piece 91) is respectively set at the end of aforesaid first swivel pin 3211 and the second swivel pin 3311.

One is respectively configured with perpendicular to the first trailing arm bending part 42 of the first trailing arm 4 in the top and bottom of aforesaid first trailing arm 4, first trailing arm bending part 42 is configured with one just as the first slide-and-guide flange 421 of door-hinge effect, aforementioned first blackboard plate body 6 is bearing on the first slide-and-guide flange 421 towards the side of the first trailing arm 4 slidably; One is respectively configured with perpendicular to the second trailing arm bending part 52 of the second trailing arm 5 in the top and bottom of aforesaid second trailing arm 5, second trailing arm bending part 52 is configured with one just as the second slide-and-guide flange 521 of door-hinge effect, aforementioned second blackboard plate body 7 is bearing on the second slide-and-guide flange 521 towards the side of the second trailing arm 5 slidably; The side in opposite directions of first, second blackboard plate body 6,7 aforementioned and be positioned at back and be articulated and connected each other by hinge 10.

Still see Fig. 1, on the top surface and basal surface of the side of aforementioned first trailing arm 4, respectively offer one first sliding tray 61 at aforementioned first blackboard plate body 6, aforesaid first slide-and-guide flange 421 matches with this first sliding tray 61; On the top surface and basal surface of the side of the second trailing arm 5, respectively offer one second sliding tray 71 at aforementioned second blackboard plate body 7, aforesaid second slide-and-guide flange 521 matches with this second sliding tray 71.

Aforesaid angle adjusting mechanism 8 preferably but not the structure be definitely limited to is as follows: comprise first, second screw 81, 82 and adjustment sheet 83, mill screw 81 is fixed on the bottom of aforementioned first blackboard plate body 6 towards the side of the second blackboard plate body 7, second screw 82 is fixed on the bottom of the second blackboard plate body 82 towards the side of the first blackboard plate body 81, adjustment sheet 83 offers an adjustment film trap 831, first screw 81 and the second screw 82 probe into and regulate film trap 831 and limit by the first nut 811 screwed on the first screw 81 and by the second nut 821 screwed on the second screw 82.

Conveniently place to receive and write pen and similar instrument, under aforesaid first blackboard plate body 6 using state, the bottom of the length direction of side is toward the outside configured with one first pen placing groove 62; The bottom of the length direction of same side toward the outside under aforementioned second blackboard plate body 7 using state is configured with one second pen placing groove 72.

When the up-down adjustment of short transverse will be made to first, second blackboard plate body 6,7, such as, when upwards regulating, as long as so first, second inner sleeve 32,33 of height adjustment bracket 3 is upwards drawn to required degree relative to first, second outer support pipe 12,13, the first lock screw 121 is screwed after adjustment completes, namely by the first lock screw 121, first inner sleeve 31 is locked, by the second lock screw 131, second inner sleeve 33 is locked simultaneously.

When will angular adjustment to first, second blackboard plate body 6,7 time, as long as so unscrew first, second nut 811,821, by operator, active force is applied to the first blackboard plate body 6 and/or the second blackboard plate body 7, make first, second blackboard plate body 6,7 ∧ font trend as shown in Figure 1, again first, second nut 811,821 is screwed after angular adjustment, make first, second blackboard plate body 6,7 maintenance position after the adjustment.

When the utility model will be made to move to field of employment separately or withdraw in field of employment, so can be played a role by a pair walking mechanism 2.

As shown in the above description, first, second blackboard plate body 6,7 both can form in-line relation each other, and the plane that namely formation one is overall, also can form the aforesaid relation being tending towards ∧ font mutually.

In sum, the technical scheme that the utility model provides overcomes the deficiency in prior art, successfully completes invention task, embodies the technique effect referred in the superincumbent technique effect hurdle of applicant objectively.

Claims

1. the adjustable blackboard of a kind of multi-angle, it is characterized in that comprising a bearing support (1), this bearing support (1) comprises a bearing support crossbeam (11), one first outer support pipe (12) and one second outer support pipe (13), first outer support pipe (12) is fixed with the left end of bearing support crossbeam (11), and the second outer support pipe (13) and the first outer support pipe (12) longitudinally walk abreast and fix with the right-hand member of bearing support crossbeam (11), a pair walking mechanism (2), this is connected the bottom of one of them walking mechanism in walking mechanism (2) with described first outer support pipe (12), and this is connected the bottom of another walking mechanism in walking mechanism (2) with described second outer support pipe (13), one height adjustment bracket (3), this height adjustment bracket (3) comprises and highly regulates crossbeam (31), first inner sleeve (32) and the second inner sleeve (33), the upper end of the first inner sleeve (32) with highly regulate the left end of crossbeam (31) to fix, and the lower end of the first inner sleeve (32) and the first described outer support pipe (12) are slidably matched, second inner sleeve (33) and the first inner sleeve (32) are longitudinally parallel, the upper end of this second inner sleeve (33) with highly regulate the right-hand member of crossbeam (31) to fix, and the lower end of the second inner sleeve (33) and the second described outer support pipe (13) are slidably matched, one first trailing arm (4) and one second trailing arm (5), the upper end thereof of the first trailing arm (4) and described first inner sleeve (32), the upper end thereof of the second trailing arm (5) and described second inner sleeve (5), one first blackboard plate body (6) and one second blackboard plate body (7), first blackboard plate body (6) is bearing on the first trailing arm (4) towards the side of described first trailing arm (4) slidably, second blackboard plate body (7) is bearing on the second trailing arm (5) slidably towards the side of described second trailing arm (5), and the side in opposite directions of first, second blackboard plate body (6,7) is articulated and connected each other, one angle adjusting mechanism (8), this angle adjusting mechanism (8) is connected between first, second blackboard plate body (6,7) in the position of the bottom of the side in opposite directions corresponding to first, second blackboard plate body (6,7).

2. the adjustable blackboard of multi-angle according to claim 1, it is characterized in that being equipped with in the upper end of the first described outer support pipe (12) first lock screw (121) for locking first inner sleeve (32) of described height adjustment bracket (3), and be equipped with second lock screw (131) for locking described second inner sleeve (33) in the upper end of the second described outer support pipe (13).

3. the adjustable blackboard of multi-angle according to claim 1, it is characterized in that described a pair walking mechanism (2) respectively comprises a walking beam (21) and a pair road wheel (22), a walking beam connecting shaft hole (211) is offered at the middle part of the length direction of walking beam (21), a pair road wheel (22) respectively pivotable is arranged on the two ends of walking beam (21), a connection bearing pin (9) is respectively fixed with in the bottom of the first described outer support pipe (12) and the second outer support pipe (13), a clamping piece (91) is equipped at the end connecting bearing pin (9), described walking beam connecting shaft hole (211) be connected bearing pin (9) and match, and limited by described clamping piece (91).

4. the adjustable blackboard of multi-angle according to claim 1, is characterized in that described bearing support crossbeam (11), the first outer support pipe (12) and the second outer support pipe (13) are the rectangular or foursquare hollow tube of shape of cross section.

5. the adjustable blackboard of multi-angle according to claim 1, it is characterized in that offering one first hinged pin-and-hole (321) in the upper end of described the first inner sleeve (32), this first hinged pin-and-hole (321) is equipped one first swivel pin (3211); Described the first trailing arm (4) is upper and the middle position being positioned at the short transverse of the first trailing arm (4) is fixed with the first trailing arm hinged seat (41), this the first trailing arm hinged seat (41) offers the hinged bore of the first trailing arm (411), the hinged bore of this first trailing arm (411) is corresponding with described first hinged pin-and-hole (321), inserts in the hinged bore of the first trailing arm (411) make the first trailing arm (4) and the first inner sleeve (32) hinged by described first swivel pin (3211); Offer one second hinged pin-and-hole (331) in the upper end of described second inner sleeve (33), this second hinged pin-and-hole (331) is equipped one second swivel pin (3311); Described the second trailing arm (5) is upper and the middle position being positioned at the short transverse of the second trailing arm (5) is fixed with the second trailing arm hinged seat (51), this the second trailing arm hinged seat (51) offers the hinged bore of the second trailing arm (511), the hinged bore of this second trailing arm (511) is corresponding with described second hinged pin-and-hole (331), inserts in the hinged bore of the second trailing arm (511) make the second trailing arm (5) and the second inner sleeve (33) hinged by described second swivel pin (3311).

6. the adjustable blackboard of multi-angle according to claim 1, it is characterized in that respectively being configured with one first trailing arm bending part (42) in the top and bottom of described the first trailing arm (4), first trailing arm bending part (42) is configured with one first slide-and-guide flange (421), and described first blackboard plate body (6) is bearing on the first slide-and-guide flange (421) towards the side of the first trailing arm (4) slidably; One second trailing arm bending part (52) is respectively configured with in the top and bottom of described the second trailing arm (5), second trailing arm bending part (52) is configured with one second slide-and-guide flange (521), and described second blackboard plate body (7) is bearing on the second slide-and-guide flange (521) towards the side of the second trailing arm (5) slidably; The side in opposite directions of described first, second blackboard plate body (6,7) is articulated and connected each other by hinge (10).

7. the adjustable blackboard of multi-angle according to claim 6, it is characterized in that on the top surface and basal surface of the side of described first trailing arm (4), respectively offering one first sliding tray (61) at described first blackboard plate body (6), the first described slide-and-guide flange (421) matches with this first sliding tray (61); On the top surface and basal surface of the side of the second trailing arm (5), respectively offer one second sliding tray (71) at described second blackboard plate body (7), the second described slide-and-guide flange (521) matches with this second sliding tray (71).

8. the adjustable blackboard of multi-angle according to claim 1, it is characterized in that described angle adjusting mechanism (8) comprises first, second screw (81, 82) and adjustment sheet (83), first screw (81) is fixed on the bottom of described first blackboard plate body (6) towards the side of the second blackboard plate body (7), second screw (82) is fixed on the bottom of the second blackboard plate body (7) towards the side of the first blackboard plate body (6), adjustment sheet (83) offers an adjustment film trap (831), described the first screw (81) and the second screw (82) probe into and regulate film trap (831) and limit by the first nut (811) screwed on the first screw (81) and by the second nut (821) screwed on the second screw (82).

9. the adjustable blackboard of multi-angle according to claim 3, is characterized in that described clamping piece (91) is split pin or jump ring.

10. the adjustable blackboard of multi-angle according to claim 1 or 6 to 8 arbitrary claims, to is characterized in that under described first blackboard plate body (6) using state the bottom of the length direction of side is toward the outside configured with one first pen placing groove (62); Under described second blackboard plate body (7) using state, the bottom of the length direction of side is toward the outside configured with one second pen placing groove (72).