CN2030947U - Up and down movable blackboard - Google Patents

Abstract

An up and down movable blackboard is a teaching appliance formed by universal mechanical technique, and can be used in culture and scientific knowledge exchanging places such as classrooms, assembly rooms, etc. the utility model is to assemble guide pulley components on the frame of a movable blackboard. A plurality of rollers in the components effectively limit the movable degree of freedom of the blackboard from different directions, creating the advantages of no shaking, no declining and no jamming of the blackboard. Because rolling friction exists between the blackboard and the guide rail, the up and down moving effect is light, smooth and good with small pulling and pushing force. The geometrical section of the guide rail of the frame of the utility model is reasonably designed, and the assembling with a totally enclosed type stable integrated structure is formed by jointing plates and corner plates.

Description

Up and down movable blackboard

The utility model is a kind of teaching equipment that is made of the universal machine technology, is used for places such as classroom, meeting-place, is the necessaries that exchanges cultural scientific knowledge.

Along with the flourish of cultural and educational undertakings and teaching need, large-scale up and down blackboard arises at the historic moment.The like product of the existing several forms in home market occurs successively at present, as yiyang, hunan city teaching equipment factory, Anhua, Hunan Yan Xi culture teaching aid factory and the 88 years samples in Beijing Cultural and Educational Equipment Factory, has all produced the up and down blackboard of different structure feature.They have his own strong points, and common feature is to connect two blackboards with wire rope, utilize the own wt balance of blackboard by fixed pulley, make it to be subjected to hand push, pulling force effect to make upper and lower orientation along " n " shape guide rail and move.With regard to the version of existing product, there is following problem:

(1) blackboard frame directly inserts guide rail, for reducing the dryness friction of blackboard frame and guide rail, when its design gaps is excessive, write with pushing course in, blackboard will take place to rock more greatly, not only cause and write inconvenience, more seriously rocking when promoting makes blackboard operation deflection and blocks and can't advance.The Beijing Cultural and Educational Equipment Factory has improved the defect that blackboard rocks slightly to the strict control of " n " type guide clearance for this reason, is the dry type sliding friction but advance in guide rail because of blackboard, thereby promotion is required great effort and noise is big, uses extremely inconvenient.

(2) large-scale blackboard loading is bigger, because the design of frame cross sectional shape is unreasonable, causes guide rail frame torsional deformation easily.

(3) the said goods assembling mode is loose mail assembling, this not only mounting process bother to the user and make troubles, also often bad because of field engineering, not parallel and cause and push away, draw motionless adverse consequences as two guide rails.

The utility model purpose is to properly settle the problems referred to above from structural design:

(1) on the Reelable blackboard frame, guide wheel assembly is installed, is made it between guide rail, to advance, thereby move merrily and lightheartedly freely with rolling friction.Effectively contact with guide rail by a plurality of steamboats in addition, the movable degree of freedom of restriction blackboard is rocked problem to solve blackboard.

(2) design shape, guide rail frame rational in infrastructure solve because of the excessive problem that causes the twisted distortion of frame of blackboard gravity.

(3) adopt Totally-enclosed-type structure, whole location and installation.Both brought great convenience like this, guaranteed again that result of use was good to the user.

The utility model structure is as follows:

Connect two blackboards respectively with the wire rope two ends, walk around fixed pulley, make it under hand push, pulling force effect, to do directed movement along guide rail.

Basis is novel installs guide wheel assembly on the side, both sides of every blackboard frame.Guide wheel assembly is made up of support plate, side wheel, return pulley, as shown in Figure 2.Side wheel 5 and side wheel 6 all are installed on the support plate 3 in the mode of off-centre, respectively a contacts side surfaces of emphasis and guide rail.Exposure level between the departure degree of excentric shaft size decision wheel, the rail can be a principle lightly with feel when assembling, and excentric shaft is suitably regulated.Return pulley 4 in the guide wheel assembly keeps minim gap with the guide rail bottom surface, makes L _{The gap}≤ 0.5mm is for well.So guide wheel assembly has limited the degree of freedom of blackboard activity effectively, the plate face can not arbitrarily be rocked, the phenomenon of also do not produce deflection, blocking, each roller of guide wheel assembly all is equipped with bearing, make blackboard on the basis of self gravitation balance, only need push away a little, pulling force just can make merrily and lightheartedly moving up and down freely of blackboard.

Each plate side is adorned 2 guide wheel assemblies.By calculating and test, guide wheel assembly symmetric position as shown in Figure 4 with the relative direction assembling of return pulley, can more effectively be controlled blackboard plane rocking in level and vertical direction.

This is novel also to have designed the guide rail frame structure that guide rail and frame are integrated, as shown in Figure 3.Rail sections is " E " shape, and frame part is the rectangle of hollow.So cross sectional shape can make the frame guide rail both light and handy and obtain the benefit of load best results.It has guaranteed that housing itself has enough rigidity, prevents the stressed torsional deformation of frame well.At the ad hoc crisperding of having counted as projection 4 of two medial ends of guide rail " E " shape, proving by Stress calculation that this structure plays reduces owing to long-term use middle guide to be subjected to the slight curves deformation that the outside expansion force of two eccentric rollers causes and avoid in use, the moment impact that is subjected to producing under the improper situation perpendicular to the plate face, the problem that causes the deflection of plate face, guide wheel to derail.

This 3rd novel feature is the structure that equipment set adopts totally-enclosed form, and the measure of taking is:

(1) guide rail frame two ends are 45 ° of right angle splicings.

On the bottom surface of (2) four frame right angle splicings place, each is screwed with the interior tent of square connecting plate of a block length (Fig. 5) and place, guide rail frame bottom surface T-slot and is connected.

(3) with the vertical direction of base plate on be connected by screw retention with the guide rail scuncheon with a gusset (Fig. 6).

Because connecting plate and gusset from three orthogonal direction actings in conjunction, make guide rail frame counterpart well, fully satisfy the rigidity requirement of antitorque, the bending resistance of framework, guarantee that the guide rail frame has the well parallel of stable right-angle structure and upright guide rail.

Use when installing, only need with getting final product on the wall of expansion bolt by the nail of the bolt via hole on the connecting plate.

This new embodiment as shown in Figure 1.

2 of Reelable blackboards, 2 meters of every block lengths, wide 1 meter, be to make with the sheet metal face, the two sides all can be write.Every Reelable blackboard both sides frame adorned 2 groups of guide wheel assemblies, and each roller system of guide wheel assembly forms with nonmetallic materials such as teflon self-control, and wheel face is wear-resisting and light and handy, noiseless.The guide rail frame is that as shown in Figure 3, the rectangle width and the guide rail width of frame framework are about 1:1 with the processing of fine aluminum section bar.

By to the Reelable blackboard performance test after the overall package, its characteristics are as follows:

(1) the clipboard face is 2 * 2 * 1 meter ²

(2) overall weight is 40 kilograms

(3) push away, pull on down and move merrily and lightheartedly freely noiseless, F _{Push-pull effort}≤ 1 kilogram

The Figure of description explanation

Fig. 1 Reelable blackboard structural drawing

1 guide rail housing

2 portable plate faces

3 pulley blockss and wire rope

4 guide wheel assemblies

5 connecting plates

6 gussets

Fig. 2 guide wheel assembly structural drawing

1 portable plate face

1 guide rail housing

7 support plates

8 return pulleys

9 side wheels

10 side wheels

Fig. 3 guide rail frame sectional view

1 frame framework

11 orbit of guide rail

12 T type grooves

13 crisperdings

Fig. 4 guide wheel assembly is at portable plate side scheme of installation

Fig. 5 connecting plate shape synoptic diagram

The gusset synoptic diagram of two kinds of shapes of Fig. 6

Claims (3)

1, connect two blackboards respectively with the wire rope two ends, walk around fixed pulley, can make the Reelable blackboard that upper and lower orientation moves, it is characterized in that along certain guide rail:

(1) guide rail is " E " font, and frame is the hollow rectangle, and guide rail and frame are integrated,

(2) do directed blackboard frame side of moving in guide rail guide wheel assembly is housed, two eccentric rollers of guide wheel assembly contact with the guide rail left and right side respectively, and return pulley in the guide wheel assembly and guide clearance are L≤0.5mm.

2, according to the described Reelable blackboard of claim 1, it is characterized in that:

(1) on the bottom surface, guide rail frame four right angle, be furnished with the rectangle connecting plate, link to each other with frame with screw,

(2) medial surface of four jiaos of splicings place of guide rail frame has gusset to link to each other with frame from two vertical direction with screw.

3, according to the described Reelable blackboard of claim 1, it is characterized in that the every side of Reelable blackboard in symmetric position with 2 guide wheel assemblies of the relative direction of return pulley assembling.

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