CN2298141Y

CN2298141Y - Turnover blackboard

Info

Publication number: CN2298141Y
Application number: CN 97236719
Authority: CN
Inventors: 朱为栋
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-08-04
Filing date: 1997-08-04
Publication date: 1998-11-25
Anticipated expiration: 2007-08-04

Abstract

The utility model relates to a turnover blackboard which is formed by mutual wedge of a plurality of strip plates. The right and the left both sides of each strip plate are provided with rotary shafts. Each rotary shaft is provided with a rotary block. The both sides are connected with each rotary block in series by two ropes which are connected with a bipolar motor from the front and the back both sides of the rotary block, wherein, one rope is connected with the joint at the upper edge of one side of each rotary block in series. The other rope is connected with the joint at the bottom edge of one side of each rotary block in series. The lower end of two ropes connected together winds a pulley wheel. The pulley wheel is connected with a reversing switch, and the reversing switch is connected with a tension spring. Each strip plate can turn over 180 DEG. Therefore, the positive and reverse both surfaces of the blackboard can be used. The back surface is provided with an electric blackboard eraser which can rub from the back surface to avoid flying of powder dust.

Description

Convertible blackboard

The utility model relates to a kind of convertible blackboard, belongs to cultural goods.

The blackboard of middle and primary schools' use at present mostly is the fixed head of monoblock greatly, and its area is subjected to the restriction of classroom metope, can not be excessive, can only simultaneously use, write area is little, and utilization rate is low, for senior class teaching and the bigger class of some writing on the blackboard amount, the blackboard area often is difficult to satisfy the demand.

The purpose of this utility model provides a kind of convertible blackboard, and it can make the blackboard multiaspect use, and is not increasing under the situation that accounts for wall area, increases write area, improves the blackboard utilization rate.

The convertible blackboard of the utility model is agreed with mutually by several battens and forms, each batten left and right sides is provided with rotating shaft, each rotating shaft is connected with switch block, each is connected in series both sides with each switch block with the both sides, front and back of two ropes that link to each other with either-rotation motor from switch block, wherein a rope is connected in series with the upper limb node of each switch block one side, and another root rope is connected in series with the lower edge node of each switch block opposite side, and the lower end of two ropes links to each other and walks around a movable pulley, this pulley links to each other with a reversing switch, and reversing switch links to each other with extension spring.When pressing manual switch, motor is slow rotation just, and the rope of serial connection lower edge node rises, the rope of serial connection upper limb node descends, and each switch block promptly drives rotating shaft and batten produces 180 degree rotations, and batten is reversed, the back side originally changes into the front, can continue to write, and front originally changes into the back side.Write and press manual switch after full, make the motor reverse rotation, each batten reverse flip 180 degree, just, the back side exchanges once more.The self-return when movable pulley of lower end and spring are used for rope and excessively promote.For the activity that makes switch block and rope is directed, of the present utility model about two sides respectively be provided with a pair of switch block guidance tape, switch block is counter-rotating activity up and down in a pair of guidance tape.Front and back two sides of each switch block have the rope gathering sill.The back side of the utility model blackboard also is provided with the driven blackboard brush device, it comprises brush body, flute profile track, pulley, conveyer belt, either-rotation motor and contact switch and automatic reverse switch, brush body is by slide block and the interlocking of flute profile track, and can slidably reciprocate along track by the either-rotation motor driving with conveyer belt, with blackboard back side outwash.This blackboard lower end is provided with the drawer that gathers chalk dust.

In sum, the utility model blackboard can two-sidedly use, and the blackboard utilization rate is doubled not increasing, and driven blackboard is brushed from back side brushing, and bisque falls in the collection powder drawer from the back side, thereby can avoid bisque to fly upward.Upset of this blackboard and brushing mechanism all start by push-botton operation, and be very convenient.

Below in conjunction with description of drawings structure of the present utility model.

Fig. 1 is the structural representation of this convertible blackboard.

Fig. 2 is that the A of Fig. 1 is to view.

Fig. 3 is the schematic perspective view of interconnected relationship between the expression switch block.

Fig. 4 is the B-B profile of Fig. 1.

Fig. 5 is the structural representation of driven blackboard brush.

As shown in Figure 1, blackboard is agreed with mutually by several stripe board 13 and forms (mode of agreeing with is seen Fig. 4), each batten about 13 two end is provided with rotating shaft 2, axle head is connected with switch block 8, each switch block is by rope 7 and 7 ' involve, the upper end of two ropes is walked around two fixed pulleys 6,6 ' (referring to Fig. 1,2,3) and is linked to each other with either-rotation motor 5, and movable pulley 10 is walked around in the lower end; Reversing switch 11 upper ends link to each other with movable pulley 10, and the lower end links to each other with extension spring 12.The back side of this blackboard is provided with blackboard brush 3, and brush body 3 is rabbeted with slide block 31 and flute profile track 4, and can slidably reciprocate along track.Collection powder drawer 15 is equipped with in the blackboard lower end, the both sides, front and back of switch block have gathering sill shown in Figure 3 81 and 81 ', rope 7 is connected in series with the lower edge node 82 of each switch block front side, rope 7 ' with the upper limb node 82 of each switch block rear side ' be connected in series.Two sides are respectively established a pair of switch block guidance tape 9 (see figure 1)s about this blackboard, and the structure of guidance tape is seen Fig. 2, and from scheming as seen, switch block 8 is movable between a pair of guidance tape 9, and the arcuate segments of guidance tape is convenient to the switch block counter-rotating.Switch 16 is power switches of motor 5 among Fig. 1.

The structure of driven blackboard brush is seen Fig. 5, brush body 3 by node 18 and 18 ' with conveyer belt 19 and 19 ' link to each other, two send to be with and walk around pulley 21 and links to each other with either-rotation motor 20, base plate 14 left ends are equipped with contact switch 22, right-hand member is equipped with reversing switch 23.Switch 17 is power switches of motor 20 among Fig. 1.

The utility model blackboard operation principle is as follows: Push switch 16 starts either-rotation motor 5, rope 7 upwards draws each switch block 8 by node 82, break away between the switch block and agree with, when node 81 is led to a high position, node 81 ' reduce to low level, this moment, switch block turned over 180 degree, transmitted by rotating shaft 2 simultaneously and made each batten 180 degree upset.Motor continues rotation, and switch block is by hyper-traction, and this moment, pulley 10 upwards spurred reversing switch 11, switch 11 closures, the sense of current changes, and the motor reverse rotation descends rope 7 and switch block 8, the switch block hyper-traction disappears, each switch block agrees with once more simultaneously, and pulley descends, and reversing switch 11 is disconnected by the extension spring effect, press power switch 16 and cut off the electricity supply the left alone without help commentaries on classics of motor this moment.When needing once more turnover blackboard, only need press again switch 16, switch block i.e. reverse rotation 180 degree again.When the blackboard with writing on the blackboard is flipped to the back side, can press power switch 17, either-rotation motor 20 is activated, under driving-belt drove, brush body 3 wiped the blackboard back side from left to right, when brush body is run into right-hand member reversing switch 23, the sense of current changes, motor 20 reverse rotations, brush body wipes from left to right once more, until the contact switch 22 back stops of running into left end.Secondary wipes back and forth, guarantees that blackboard cleans.

Claims

1. convertible blackboard, it is characterized in that agreeing with mutually and form by several battens, each batten left and right sides is provided with rotating shaft, each rotating shaft is connected with switch block, and each is connected in series both sides with each switch block with the both sides, front and back of two ropes that link to each other with either-rotation motor from switch block, and wherein a rope is connected in series with the upper limb node of each switch block one side, another root rope is connected in series with the lower edge node of each switch block opposite side, the lower end of two ropes links to each other and walks around a movable pulley, and this pulley links to each other with a reversing switch, and reversing switch links to each other with extension spring.

2. according to the convertible blackboard of claim 1, it is characterized in that the back side is provided with the driven blackboard brush device, it comprises brush body, flute profile track, pulley, conveyer belt, either-rotation motor, contact switch and automatic reverse switch, brush body is rabbeted by slide block and flute profile track, and can be slidably reciprocated along track by the either-rotation motor driving with conveyer belt.

3. according to the convertible blackboard of claim 1, it is characterized in that the blackboard lower end is provided with the drawer that gathers chalk dust.