CN2320990Y

CN2320990Y - Proportional lever scale

Info

Publication number: CN2320990Y
Application number: CN 97242562
Authority: CN
Inventors: 黄月异
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-11-03
Filing date: 1997-11-03
Publication date: 1999-05-26
Anticipated expiration: 2007-11-03

Abstract

The utility model relates to a proportional lever scale. The utility model is mainly characterized in that a scale lever forms a two-section structure, the scale lever is composed of a main scale lever provided with scales and a scale pan turning lever for hanging a scale pan, wherein, the scales on the main scale lever is scales with equal distances alpha, one end of the main scale lever provided with a point supporting button is orderly provided with a notch and a hinging hole, and the distance between the point supporting button and the center of the notch and the distance between the center of the notch and the center of the hinging hole are alpha; one end of the scale pan turning lever is provided with a scale pan hanging button whose inner side is provided with a hinging hole, the distance between the hinging hole and the scale pan hanging button is alpha, and the scale pan turning lever is hinged on the end of the main scale lever.

Description

The equal proportion lever scale

The utility model relates to Weight metering device, belongs to a kind of lever scale.

As everyone knows, when learning physics, chemistry, generally to important phenomenon, principle or law, all to do experiment, to help and to deepen classmate's study understanding as aided education.Past is because condition restriction all is that the classmate sees that the teacher does the demonstration experiment.Along with the improvement of teaching condition and the raising of study requirement, require student's experiment of doing yourself more and more, for this reason, the school that has has begun to create the experiment condition of " student one experimental box ".Certainly, improve in this experiment condition large tracts of land, various traditional experimental provision can not be indiscriminately imitated, must be under the prerequisite that satisfies requirement of experiment substantially various traditional experiment device be done bigger improvement, make it to have miniaturization, summary, operation and characteristics such as not fragile easily.In the physics, balance chapter, the joint of study object during as study " moment ", " equilibrium condition " or " lever principle ", always need be done a series of experiments, and wherein, lever scale then is a kind of level type experimental provision more directly perceived and commonly used.But existing lever scale experimental provision remains in the some shortcomings part, mainly be not to be the equal proportion corresponding relation between the resistance arm set on the arm beam of steelyard and power arm, the effect that obtains when causing the student to do experiment also needs just can be expressly understood by certain calculating according to not coming into plain view.

The purpose of this utility model provides the equal proportion lever scale in a kind of student of the belonging to individual experimental box, makes when doing the experiment of relevant balance with this device, can ten just calculates the corresponding value of each element of a pair of moment easily.

Realize the utility model of above-mentioned purpose, comprise the arm beam of steelyard, arm beam of steelyard fulcrum button, the scale pan and sliding weight of steelyard that general lever scale all has, characteristics of the present utility model are, the arm beam of steelyard is two segment structures, turning over bar by a main arm beam of steelyard and that is shaped on scale in order to the scale pan of hanging the scale pan forms, scale on the main arm beam of steelyard is equidistant a scale, and the end that the fulcrum button is set on this main arm beam of steelyard is shaped on a notch and a hinge hole successively, and the spacing at the spacing at fulcrum button and notch center and notch center and hinge hole center is a; The end that the scale pan turns over bar is provided with a scale pan prolong knot button, is provided with a hinge hole the inboard of this prolong knot button and apart from it for a distance, and the scale pan turns over the end that bar is hinged on the main arm beam of steelyard.

As above the utility model of structure, its scale pan turn over bar can be around the hinge hole upset of the main arm beam of steelyard.The scale pan turns over bar two kinds of rollover states, and a kind of scale pan prolong knot button that is the scale pan turns on the bar is turned in the notch of the main arm beam of steelyard, and at this moment, the distance between scale pan center of gravity and arm beam of steelyard fulcrum button is 1a; Another kind is that the scale pan prolong knot button that the scale pan turns on the bar is turned to outside the rod end of the main arm beam of steelyard, and at this moment, the distance between scale pan center of gravity and arm beam of steelyard fulcrum button is 3a.

The utility model has the advantages that the arm beam of steelyard is two segment structures, make the distance variableization between the scale pan and fulcrum button, just do not need a required button, two buttons usually yet, and, scale on the main arm beam of steelyard is equidistant scale, distance between the scale pan and fulcrum button is the multiple of main arm beam of steelyard high scale, makes that then the student can know the corresponding value of each element of a pair of moment at a glance with the multiple proportional relation when doing the experiment of relevant balance with this device.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is another kind of user mode figure of the present utility model.

Embodiment of the present utility model as shown in drawings.

See by Fig. 1, the utility model mainly turns over bar 7, arm beam of steelyard fulcrum button 3, the scale pan 8 and sliding weight of steelyard by the main arm beam of steelyard 1, the scale pan and constitutes, scale on the main arm beam of steelyard 1 is equidistant a scale, the end of fulcrum button 3 one sides is provided with a hinge hole 6 on this main arm beam of steelyard 1, and on the main arm beam of steelyard 1 between fulcrum button 3 and the hinge hole 6, be shaped on a notch 4, reach in the heart in fulcrum button 3 and the notch 4 on this main arm beam of steelyard 1 center of notch 4 and hinge hole 6 in the heart, its spacing is a; The end that the scale pan turns over bar 7 is provided with a scale pan prolong knot button 5, is provided with a hinge hole the inboard of this prolong knot button 5 and apart from it for a distance; So the scale pan of structure turns over bar 7, is hinged in the end of the main arm beam of steelyard 1 by a pivot pin.Number in the figure 2 is the fulcrum on the main arm beam of steelyard, and fulcrum button 3 is connected on this fulcrum 2.As seen from Figure 1, the main arm beam of steelyard 1 turns over bar 7 with the scale pan and is positioned on the same axis, and scale pan prolong knot button 5 really is shelved on well on the center line of the notch 4 on the main arm beam of steelyard 1, between the center of gravity that makes the scale pan 8 and fulcrum button can distance and the main arm beam of steelyard 1 on one keep off scale value and equate.

See by another kind of user mode of the present utility model shown in Figure 2, the scale pan turn over bar 7 than a last embodiment overturn 180 the degree, at this moment, the scale pan turns over scale pan prolong knot button 5 broken being turned to outside the rod end of the main arm beam of steelyard 1 on the bar 7, at this moment, the distance that the center of gravity of the scale pan 8 and arm beam of steelyard fulcrum button are 3 is 3a, is on the main arm beam of steelyard 13 times of a retaining scale.

Claims

1, a kind of equal proportion lever scale that includes the arm beam of steelyard, arm beam of steelyard fulcrum button, the scale pan and sliding weight of steelyard, it is characterized in that: the arm beam of steelyard is two segment structures, turning over bar (7) by a main arm beam of steelyard (1) and that is shaped on scale in order to the scale pan of hanging the scale pan forms, wherein, scale on the main arm beam of steelyard (1) is equidistant a scale, and the end that fulcrum button (3) is set on this main arm beam of steelyard (1) is shaped on a notch (4) and a hinge hole (6) successively, and fulcrum button (3) is a with the spacing at notch (4) center and the spacing at notch (4) center and hinge hole (6) center; The end that the scale pan turns over bar (7) is provided with a scale pan prolong knot button (5), is provided with a hinge hole the inboard of this prolong knot button (5) and apart from it for a distance, and the scale pan turns over the end that bar (7) is hinged on the main arm beam of steelyard (1).