CN203689767U

CN203689767U - Elliptical demonstration instrument

Info

Publication number: CN203689767U
Application number: CN201420014727.0U
Authority: CN
Inventors: 施正栋
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-01-10
Filing date: 2014-01-10
Publication date: 2014-07-02
Anticipated expiration: 2024-01-10

Abstract

The utility model relates to an elliptical demonstration instrument. The instrument comprises a bottom plate, an adjustable plate, a vertical rod, a support rod, a pencil and an elastic pen. The bottom plate and the adjustable plate are connected in an up-down rotation manner. The public connected edge of the bottom plate and the adjustable plate are provided with a protractor. The bottom plate is provided with a slide groove. A slide block is fixed to the bottom end of the vertical rod. The slide block is embedded into the slide groove and drives the vertical rod to move back and forth on the bottom plate. The upper end of the vertical rod is connected to the telescoping support rod. A pen holder is fixed to the end part of the support rod. The pencil is fixed to the lower end of the pen holder. The elastic pen is fixed to the upper end of the pen holder. The point of the elastic pen is vertical and upward. The instrument is reasonable in structural design and simple and convenient to operate. The pen holder rotates one circle around the vertical rod to draw an ellipse trace on the adjustable plate and a circle on the bottom plate, so that the instrument helps students to visually and deeply understand the knowledge point and to increase learning interests.

Description

A kind of oval demonstrator

Technical field:

The utility model relates to a kind of teaching demonstration utensil, relates in particular a kind of oval demonstrator.

Background technology:

Ellipse is the one of conic section, that in plane, the distance sum to two fixed points is the track of the point of normal value, a few days ago, in teaching, also there is no a kind of demonstration instrument that can directly draw elliptical orbit, teacher has and is familiar with intuitively and understands ellipse for the ease of student, conventionally the free-hand ellipse that draws on blackboard is explained, or adopt the mode of plane cutting circular cone to obtain oval image, but its implication of student or indigestion, and in the time of actual solving a problem, be also difficult to draw ellipse accurately, affect solve a problem thinking and the efficiency of solving a problem.

Utility model content:

The purpose of this utility model is for the deficiencies in the prior art part, a kind of oval demonstrator is provided, reasonable in design, simple to operation, pen stand rotates a circle and can on adjustable plate, draw elliptical orbit around vertical bar, on base plate, draw round track, being conducive to student has directly perceived, deep understanding to this knowledge point, improves students ' interest of study.

Technology solution of the present utility model is as follows:

A kind of oval demonstrator, comprises base plate, adjustable plate, vertical bar, support bar, pencil and spring pen, it is characterized in that: described base plate and adjustable plate, for being rotatably connected up and down, are provided with protractor in the common edge being connected at base plate with adjustable plate; On described base plate, offer chute, vertically a slide block is fixed in the bottom of bar, and slide block is embedded in chute, and drives vertical bar to move around on base plate; The telescopic support bar of upper end level connection joint one of described vertical bar, a pen stand is fixed in the end of support bar, and a pencil is vertically fixed in the lower end of pen stand, and a spring pen is fixed in upper end, and spring pen nib is straight up.

As improvement, described spring pen is tubulose, and a spring is housed in inner chamber, and spring is placed in pen core below.

As improvement, the direction that described vertical bar moves around on base plate is vertical with the common edge that base plate is connected with adjustable plate.

The beneficial effects of the utility model are:

The utility model reasonable in design, simple to operation, pen stand rotates a circle and can on adjustable plate, draw elliptical orbit around vertical bar, on base plate, draw round track, being conducive to student has directly perceived, deep understanding to this knowledge point, improves students ' interest of study.

Accompanying drawing explanation:

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

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

Fig. 2 is the structural representation of spring pen.

Embodiment:

The following stated is only preferred embodiment of the present utility model, not scope of the present utility model is limited.

Embodiment, with reference to accompanying drawing 1, a kind of oval demonstrator, comprises base plate 1, adjustable plate 2, vertical bar 3, support bar 4, pencil 5 and spring pen 6, described base plate 1 for being rotatably connected up and down, is provided with protractor 7 in the common edge being connected with adjustable plate 2 at base plate 1 with adjustable plate 2; On described base plate 1, offer chute 11, vertically a slide block 31 is fixed in the bottom of bar 3, and slide block 31 is embedded in chute 11, and drives vertical bar 3 to move around on base plate 1; The telescopic support bar 4 of upper end level connection joint one of described vertical bar 3, a pen stand 8 is fixed in the end of support bar 4, and a pencil 5 is vertically fixed in the lower end of pen stand 8, and a spring pen 6 is fixed in upper end, and spring pen 6 nibs are straight up.

As shown in Figure 2, described spring pen 6 is tubulose, and a spring 61 is housed in inner chamber, and spring 61 is placed in pen core 62 belows.

The direction that described vertical bar 3 moves around on base plate 1 is vertical with the common edge that adjustable plate 2 is connected with base plate 1.

Principle of work: a kind of oval demonstrator, vertically bar 3 is fixed in chute 11 by slide block 31, angle between base plate 1 and adjustable plate 2 can regulate by protractor fixing in its common edge 7, regulate the length of retractable support lever 4 that 61 6 nibs of spring are just contacted with adjustable plate 2, manual rotation support bar 4, pen stand 8 is rotated around vertical bar 3, pencil 5 on base plate 1, draw round in, 61 6, spring can draw ellipse on adjustable plate 2, in teaching demonstration process, adjust the angle between position or regulating base board 1 and the adjustable plate 2 of vertical bar 3 on

base plate

1, 61 6, spring can draw the ellipse of different sizes on adjustable plate 2, simple to operation, contribute to the understanding of student to ellipse definition, and also have more directly perceived to the relation between oval and circle, deep understanding, improve student's learning interest.

Claims

1. an oval demonstrator, comprise base plate (1), adjustable plate (2), vertical bar (3), support bar (4), pencil (5) and spring pen (6), it is characterized in that: described base plate (1) for being rotatably connected up and down, is provided with protractor (7) in the common edge being connected with adjustable plate (2) at base plate (1) with adjustable plate (2); On described base plate (1), offer chute (11), vertically a slide block (31) is fixed in the bottom of bar (3), and slide block (31) is embedded in chute (11), and drives vertical bar (3) to move around on base plate (1); The telescopic support bar of upper end level connection joint one (4) of described vertical bar (3), a pen stand (8) is fixed in the end of support bar (4), a pencil (5) is vertically fixed in the lower end of pen stand (8), and a spring pen (6) is fixed in upper end, and spring pen (6) nib straight up.

2. the oval demonstrator of one according to claim 1, is characterized in that: described spring pen (6) is tubulose, and a spring (61) is housed in inner chamber, and spring (61) is placed in pen core (62) below.

3. the oval demonstrator of one according to claim 1, is characterized in that: the direction that described vertical bar (3) moves around on base plate (1) is vertical with the common edge that adjustable plate (2) is connected with base plate (1).