CN2577369Y

CN2577369Y - Force composition and decomposition demonstrating instrument

Info

Publication number: CN2577369Y
Application number: CN 02270648
Authority: CN
Inventors: 朱淑峰; 岳阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-11-08
Filing date: 2002-11-08
Publication date: 2003-10-01
Anticipated expiration: 2012-11-08

Abstract

The utility model discloses a force composition and decomposition demonstrating instrument, which comprises four side rulers and a diagonal ruler (3), wherein, the four side rulers are mutually connected with three sliding knobs (5) through a fixed knob (4), and a parallelogram shape is formed. The side rulers and the diagonal ruler (3) are all composed of an outer sleeve ruler (1) and an extension ruler (2), wherein, the extension rule (2) can be slid relatively to the outer sleeve ruler (1). A protractor (6) is respectively fixed on two side rulers near the side of the fixed knob (4), a chute (7) is arranged on the protractor (6), and the two side rulers can be rotated relatively to the chute (7). The force composition and decomposition demonstrating instrument of the structure has the advantages of easy use and good demonstration effect.

Description

A kind of synthetic, decomposition demonstrator of power

The utility model relates to a kind of teaching aid of the usefulness of imparting knowledge to students, and specifically, is a kind of synthetic decomposition demonstrator of power.

The synthetic of power is a difficult point of mechanical knowledge with decomposing, for ease of telling about, the normal assistant teaching aid that adopts in the teaching process, be the synthetic of power and decomposition demonstrator, existing demonstration instrument is fairly simple, generally can only qualitative explanation resolution of force synthesize knowledge, and can not quantitatively analyze, when particularly running into the explanation of constant and with the component variable angle situations such as variation of making a concerted effort of component, demonstration instrument can not clearly be demonstrated.

The purpose of this utility model is to provide a kind of synthetic, decomposition demonstrator that overcomes the power of above-mentioned shortcoming, good demonstration effect.

The utility model is achieved in that a kind of synthetic, decomposition demonstrator of power, comprise four limit chis and a diagonal line chi, four limit chis are connected to each other by a fixed knob and three sliding knobs, form parallelogram shape, limit chi and diagonal line chi constitute by overcoat chi and shrinkage-rule, shrinkage-rule can slide with respect to the overcoat chi, near on two limit chis of fixed knob one side protractor is being set, chute is set on the protractor, can rotates with respect to chute with the contacted two limit chis of protractor.

The utility model has the advantages that good demonstration effect.Four limit chis are rotational angle arbitrarily, and each limit chi is made of overcoat chi and shrinkage-rule, and its length also can be regulated, so can clearly demonstrate the synthetic situation of the various decomposition of power.In addition, this device also is provided with protractor, can intuitively clearly demonstrate the situation that various angles change.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Accompanying drawing is the utility model synoptic diagram.

As seen from the figure, four limit chis are interconnected to form parallelogram by a fixed knob 4 and three sliding knobs 5, diagonal line chi 3 is connected on the diagonal line of parallelogram, limit chi and diagonal line chi 3 all are made of overcoat chi 1 and shrinkage-rule 2, shrinkage-rule 2 can slide with respect to overcoat chi 1, its structure of sliding mutually can be taked gear ﹠ rack structure, protractor 6 is arranged on the side near fixed knob 4, chute 7 is set on the protractor 6, can rotates with respect to chute 7 with its contacted two limit chi.

For demonstrating the synthetic situation of resolution of force more specifically, all mark scale on four edges chi and a diagonal line chi 3, scale unit is newton or long measure.

The use of this device is as follows: need demonstration two component constant, during situation that the size of making a concerted effort changes with the component variable angle, only needing to rotate two limit chis that contact with protractor 6 gets final product, the angle of rotating can be seen on protractor 6, along with angle changes prolongation and the shortening that can see diagonal line chi 3 intuitively, the variation of promptly making a concerted effort; Need two fens force directions of demonstration constant, during the situation of making a concerted effort to change with component size wherein, the both sides chi direction that contact with protractor 6 is motionless, regulates interior shrinkage-rule 2 prolongations or the shortening of chi on one side, observe diagonal line chi 3 to change, the variation of promptly making a concerted effort; In like manner use this device can demonstrate the synthetic situation of various decomposition of power,, no longer be described at this.

Claims

1, synthesizing of a kind of power, decompose demonstrator, it is characterized in that: comprise four limit chis and a diagonal line chi (3), four limit chis are connected to each other by a fixed knob (4) and three sliding knobs (5), form parallelogram shape, limit chi and diagonal line chi (3) constitute by overcoat chi (1) and shrinkage-rule (2), shrinkage-rule (2) can slide with respect to overcoat chi (1), near on two limit chis of fixed knob (4) one sides protractor (6) is being set, chute (7) is set on the protractor (6), can rotates with respect to chute (7) with the contacted two limit chis of protractor (6).