CN202727726U

CN202727726U - An improved blackboard

Info

Publication number: CN202727726U
Application number: CN 201120498768
Authority: CN
Inventors: 吕巨龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-05
Filing date: 2011-12-05
Publication date: 2013-02-13
Anticipated expiration: 2021-12-05

Abstract

The utility model provides an improved blackboard and belongs to education supplies. The improved blackboard comprises two writing boards, a horizontal long shaft, two long chains and two large chain wheels. Each of the two ends of the horizontal long shaft is provided with one large chain wheel; the two ends of one long chain is fixed to fixing points of top left corners of the two writing boards respectively; the two ends of the other long chain are fixed to fixing points of top right corners of the two writing boards respectively; and the two long chains are meshed with the large chain wheels at the two ends of the long shaft at equal-length positions. The improved blackboard is characterized in that one end of the long shaft is provided with a shaft shoulder which is fixed with a small chain wheel; a short shaft is provided with a driving wheel matched with the small chain wheel; the small chain wheel is connected with the driving wheel through a short chain; and the short shaft is connected with a swing wheel through a bevel gear pair. The improved blackboard solves the problem that a blackboard is difficult to lift up and lower down because of less strength and height of teachers and students in the prior art.

Description

The improvement blackboard

Technical field

The utility model relates to a kind of teaching aid, particularly a kind of improvement blackboard.

Background technology

For a long time, structure and the shape of the lifting blackboard that teaching is used adopt traditional mode always, unalterable, namely by blackboard, the blackboard seat, pulley, steel wire rope, guide rail forms, therefore, teacher is at school the time, need to realize with very large strength push-and-pull blackboard the lifting of blackboard, height and strength size have been had requirement, and it is little with strength that height is short, all can not shift blackboard onto top or certain height, even if concerning a male sex, also have difficulties, when particularly running into schoolmarm, more difficult accomplishing concerning them given making troubles on class of teacher.

The utility model content

Technical assignment of the present utility model is to provide a kind of improvement blackboard for above-mentioned deficiency of the prior art, this improvement blackboard not only simple in structure, and have advantages of exert oneself little.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of improvement blackboard, its structure is by two clipboards, a horizontal long axis, two reel chains and two sprocket wheels form, a hinge wheel is fixed respectively at described major axis two ends, wherein reel chain two ends are separately fixed on the fixing point in the upper left corner of two clipboards, another root reel chain two ends are separately fixed on the fixing point in the upper right corner of two clipboards, described two reel chains at the equal length place respectively with the engagement of the hinge wheel at major axis two ends, it is characterized in that, be provided with a shaft shoulder at major axis one end, fix a minor sprocket on the described shaft shoulder, match with this minor sprocket and to be provided with driving wheel on minor axis, minor sprocket is connected short chain with driving wheel and connects, and shakes wheel by secondary connection of bevel-gear sett on the described minor axis.

The utlity model has following outstanding beneficial effect: upper class hour of teacher, do not need very large strength just can realize the lifting of blackboard, eliminated the restriction little to strength, simultaneously, no matter high people short person can realize lifting, solved upper class hour of academics and students because strength size and height are difficult to realize the problem of blackboard lifting, brought convenience to them.

Description of drawings

Accompanying drawing 1 is main TV structure schematic diagram of the present utility model;

Accompanying drawing 2 is the structural representations that shake wheel apparatus;

Description of reference numerals: 1 reel chain, 2 major axis, 3 hinge wheels, 4 minor sprockets, 5 short chains, 61 first angular wheels, 62 second angular wheels, 63 shake wheel, 64 minor axises, 10 clipboards.

The specific embodiment

As shown in Figure 1 and Figure 2, a kind of improvement blackboard of the present utility model, its structure is comprised of two clipboards 10, a major axis 2, two reel chains 1, two hinge wheels 3, a hinge wheel 3 is fixed respectively at described major axis 2 two ends, described reel chain 1 two ends are separately fixed on the fixing point in the upper left corner of two clipboards 10, another root reel chain 1 two ends are separately fixed on the fixing point in the upper right corner of two clipboards 10, described two reel chains 1 at the equal length place respectively with hinge wheel 3 engagements at major axis two ends.Be provided with the shaft shoulder at major axis 2 one ends, fix a minor sprocket 4 on it again, matching with this minor sprocket 4 is provided with driving wheel 6 on minor axis 64, and minor sprocket 4 is connected with driving wheel and is connected by short chain 5, shakes wheel by secondary connection of bevel-gear sett on the described minor axis 64.

Describedly shake the end fixed drive wheel 6 that wheel apparatus is a minor axis 64, the other end is fixed first

angular wheel

61,62 one-tenth 90 degree of described the first angular wheel and another second angular wheel are meshed, and described another second angular wheel 62 is taken turns 63 and is connected with shaking.

Shake wheel 63 and rotate, rotate by the moving minor axis 64 of bevel-gear sett subband, pass to major axis 2 by short chain 5, minor sprocket 4, make two reel chain synchronizing movings, realize lifting.

Claims

1. improve blackboard for one kind, its structure is by two clipboards, a horizontal long axis, two reel chains and two sprocket wheels form, a hinge wheel is fixed respectively at described major axis two ends, wherein reel chain two ends are separately fixed on the fixing point in the upper left corner of two clipboards, another root reel chain two ends are separately fixed on the fixing point in the upper right corner of two clipboards, described two reel chains at the equal length place respectively with the engagement of the hinge wheel at major axis two ends, it is characterized in that, be provided with a shaft shoulder at major axis one end, fix a minor sprocket on the described shaft shoulder, match with this minor sprocket and to be provided with driving wheel on minor axis, minor sprocket is connected short chain with driving wheel and connects, and described minor axis shakes wheel by secondary connection of bevel-gear sett.