CN2459183Y

CN2459183Y - Compasses with press telescopic fixed pointer protector

Info

Publication number: CN2459183Y
Application number: CN 00262980
Authority: CN
Inventors: 练仰贤; 吴再添
Original assignee: XIAMEN FOREIGN LANGUAGE SCHOOL
Current assignee: XIAMEN FOREIGN LANGUAGE SCHOOL
Priority date: 2000-11-27
Filing date: 2000-11-27
Publication date: 2001-11-14
Anticipated expiration: 2010-11-27

Abstract

The utility model relates to a pair of compasses, which is provided with a fixed rod, a movable rod, and a rotating shaft. A fixed needle is arranged on the lower end of the fixed rod. The rotating shaft is arranged on a connection part of the fixed rod and the movable rod. A pushing and pressing telescopic fixed needle protection device is arranged on the lower part of the fixed rod. A button which is used for regulation is arranged on the fixed needle. A spring is sheathed on the button, and is positioned in the fixed rod. A slot which is used for pushing the button up and down is arranged on the fixed rod. When the button is pushed and the fixed needle is downwards propelled, the fixed needle is pushed out of the fixed rod. After the utility model is used and the button is pressed and the fixed needle is upwards propelled, the fixed needle is retracted in the fixed rod. Then, the fixed needle is protected, so the fixed needle can not be easily damaged. The fixed needle can not damage a human body easily.

Description

Band is pushed the telescopic compasses of deciding needle protection

The utility model relates to a kind of compasses.

Compasses are a kind of circular curve plotters commonly used, and it is formed by deciding bar, moving bar and rotating shaft usually, decides the bar lower end and sets pin, and the connection place of deciding bar and moving bar is located in rotating shaft.Be exposed to and decide the bar outside owing to decide pin, therefore damage and human body caused damage easily.The CN2323980Y patent provides a kind of compasses stitch protective sleeve, and it is shell-like, and its bottom is inboard, and the cover mouth is corresponding with the pin portion of compasses stitch in order to constitute the cover mouth that coats groove, and its top is and the corresponding location division of the foot of compasses stitch.

The purpose of this utility model is to provide a kind of band that mainly is suitable for general compasses and educational compasses to push the telescopic compasses of deciding needle protection.

The utility model is set bar, moving bar and rotating shaft, decides the bar lower end and sets pin, and the connection part of deciding bar and moving bar is located in rotating shaft.Establish and push the telescopic needle protection of deciding deciding the bar bottom, its device is to decide to establish the button of regulating usefulness on the pin, and button cap is positioned at decides the bar outside, and sheathed spring on button, spring are positioned at decides bar, is used for the groove that button promotes up and down deciding to offer on the bar.When using compasses, press the button and down promote to decide pin, then Double-face sewing quilt is released and is decided outside the bar; Press the button again after the use, and up promote to decide pin, then decide the pin withdrawal and decide in the bar.

Owing to be provided with and push the telescopic needle protection of deciding, the pin of deciding of deciding the bar lower end is protected, therefore decide pin and be not easy to damage, also be not easy human body is damaged.It is simple in structure, and the cost increase is very few.

Fig. 1 pushes the telescopic structural representation of deciding the compasses of needle protection for band.

Fig. 2 is the upward view of Fig. 1.

Fig. 3 pushes the telescopic structural representation of deciding the educational compasses of needle protection for band.

Fig. 4 pushes the telescopic structural representation of deciding the educational compasses of needle protection and handle for band.

Embodiment 1: as Fig. 1; shown in 2; for a kind of band is pushed the telescopic compasses of deciding needle protection,, decide the upper end of pin 1 and pass button 2 deciding to establish the button 2 of regulating usefulness on the pin 1; sheathed spring 3 on the button 2; spring 3 is positioned at decides bar 4, and button cap 21 is positioned at decides bar 4 outsides, is used for the groove 5 that button 2 promotes up and down deciding to offer on the bar 4; circular hole 51 is expanded at the two ends of groove 5, and its diameter is less than the diameter of button cap 21.Can make during press push button 2 that to decide pin 1 flexible in deciding bar 4.

Embodiment 2: as shown in Figure 3, for a kind of band is pushed the telescopic educational compasses of deciding needle protection, establish chalk-holder 7 in the bottom of moving bar 6, the fastening button 8 of chalk is established in the outside of chalk-holder 7.The pin of deciding on the bar 41 of deciding is pressed embodiment 1 setting.It is fixing by rotating shaft 9 with the connection part of moving bar 6 to decide bar 4, and rotating shaft 9 bands are regulated the knob 10 of degree of tightness.

Embodiment 3: general educational compasses is formed by deciding bar, moving bar and rotating shaft, is not with handle.As shown in Figure 4, for a kind of band is pushed the telescopic educational compasses of deciding needle protection and handle, it is formed by deciding bar 4, moving bar 6, chalk-holder 7, the fastening button 8 of chalk, rotating shaft 9, handle 11 etc.Decide the pin 1 of deciding of bar 4 and press embodiment 1 setting.One end of handle 11 is established rotating shaft positioning sleeve 12, and is fixed in connection part rotating shaft place of deciding bar 4, moving bar 6, and handle 11 can 9 freely rotate around the shaft, and its direction and degree of tightness are by knob 10 controls of regulating degree of tightness.The top of handle 11 can be circular arc 13, so that when using, arc sections is withstood the centre of the palm, so not only makes compasses obtain a new fulcrum, and makes compasses obtain rotating torque, therefore use more convenient, and easier control.Owing to increased and pushed telescopic decide needle protection and handle, make educational compasses more practical, and the manufacturing cost increase has been very few.Two side through hole of the rotating shaft positioning sleeve 12 of said handle can extend otch, are convenient to the loading and unloading of handle 11.

Claims

1. compasses; comprise and decide bar, moving bar, rotating shaft and connection part thereof; deciding bar is provided with and decides pin; it is characterized in that establishing and pushing the telescopic needle protection of deciding deciding the bar bottom; its device is to decide to establish the button of regulating usefulness on the pin, and button cap is positioned at decides the bar outside, sheathed spring on button; spring is positioned at decides bar, is used for the groove that button promotes up and down deciding to offer on the bar.

2. a kind of compasses according to claim 1 is characterized in that the upper end of deciding pin passes button.

3. a kind of compasses according to claim 1 is characterized in that circular hole is expanded at the two ends of said groove, and Circularhole diameter is less than the diameter of button cap.

4. a kind of compasses according to claim 1 is characterized in that the connection part of deciding bar, moving bar, rotating shaft is provided with handle, and the rotating shaft positioning sleeve of handle, at its lower end is fixed in moving bar, decides connection part rotating shaft place of bar.

5. a kind of compasses according to claim 4 is characterized in that the top of handle is circular arc.