CN210309684U

CN210309684U - Safety compasses ruler

Info

Publication number: CN210309684U
Application number: CN201920559590.XU
Authority: CN
Inventors: 沈子轩
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-04-14
Anticipated expiration: 2029-04-23

Abstract

The utility model relates to a stationery field, concretely relates to safety compasses chi, include: the guide rail ruler body, the circle center rotating shaft, the large arc scribing block and the small arc scribing block; the circle center rotating shaft comprises a button disc and a shaft body, a double-layer gear is sleeved outside the shaft body, and the double-layer gear comprises a large gear and a small gear which are fixed concentrically; the inner side of the guide rail ruler body is provided with a disc groove and a slide rail, and the upper surface of the guide rail ruler body is provided with two rows of scale strips; the large circular arc scribing block is connected with the circle center rotating shaft through a large circular rack, one end of the large circular rack is fixedly connected with the large circular arc scribing block, and the other end of the large circular rack is meshed with the large gear on the circle center rotating shaft; the small arc scribing block is connected with the circle center rotating shaft through a small circular rack, one end of the small circular rack is fixedly connected with the small arc scribing block, and the other end of the small circular rack is meshed with a pinion on the circle center rotating shaft.

Description

Safety compasses ruler

Technical Field

The utility model relates to a stationery field, concretely relates to safety compasses chi.

Background

The compasses and the ruler are common drawing tools, however, the needle angle of the traditional compasses is dangerous, in the drawing process of the traditional compasses, two feet of the compasses are easy to loosen, the accuracy of drawing the arc is influenced, and in addition, the compasses and the ruler are very inconvenient to carry together. The utility model discloses a patent number 201020612621.2's utility model discloses a compasses chi, the compasses setpoint sets up the one end of ruler main part, and be provided with the compasses mobile unit in the ruler main part and can be in gliding microscler groove wherein, the compasses mobile unit can with setting-out device fixed fit's opening piece to when the ruler main part rotates around the compasses setpoint, the compasses mobile unit can drive the setting-out device and make the circle. However, the safety of the compasses ruler with the structure is poor, in the process of drawing circles, the pen holder is easy to slide, the drawn circular arcs are not regular enough, in addition, the precision of drawing circles is also poor, and the circular arcs with smaller diameters cannot be drawn.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem in the background art and providing a safety compass ruler.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a safety compass ruler comprising: the guide rail ruler body, the circle center rotating shaft, the large arc scribing block and the small arc scribing block; the circle center rotating shaft comprises a button disc and a shaft body, a double-layer gear is sleeved outside the shaft body and comprises two large gears and a small gear which are fixed concentrically, a pressing cap is arranged at the top of the button disc of the circle center rotating shaft, and a telescopic needle rod and a telescopic locking mechanism for controlling the telescopic needle rod to extend out and retract are arranged in the shaft body; the guide rail ruler body is provided with a disc groove and a slide rail on the inner side, the circle center rotating shaft is rotatably connected with the guide rail ruler body through the disc groove, the upper surface of the guide rail ruler body is provided with two rows of scale strips which are respectively a large circle scale strip and a small circle scale strip, the top of the guide rail ruler body is provided with a slide block groove, and the bottom of the guide rail ruler body is provided with a marking groove; the large circular arc scribing block is connected with the circle center rotating shaft through a large circular rack, one end of the large circular rack is fixedly connected with the large circular arc scribing block, and the other end of the large circular rack is meshed with the large gear on the circle center rotating shaft; the small arc scribing block is connected with the circle center rotating shaft through a small circular rack, one end of the small circular rack is fixedly connected with the small arc scribing block, and the other end of the small circular rack is meshed with a pinion on the circle center rotating shaft; the large arc scribing block and the small arc scribing block are respectively arranged on two sides of the circle center rotating shaft, the large circular rack and the small circular rack are oppositely arranged and are fixed in the guide rail ruler body in a sliding mode through the sliding rail, and the scale bar is arranged on the side of the large arc scribing block.

Preferably, the great arc scribing block comprises a great slide block, a fastening knob and a telescopic scribing pen, and a pen point of the telescopic scribing pen is arranged in the scribing groove.

Preferably, the small arc scribing block comprises a small sliding block, a positioning cross rod, a scribing pen point and an adjusting nut, the scribing pen point is hinged to the top of the positioning cross rod, a protrusion and a notch for positioning are arranged between the scribing pen point and the top of the positioning cross rod, the adjusting nut finely positions the positioning cross rod through a threaded transmission part arranged inside the small sliding block, and the positioning cross rod and the scribing pen point are arranged in the scribing groove.

Preferably, the guide rail ruler body is provided with a calibration positioning line on one side of the small arc scribing block, and the top of the small sliding block is provided with a positioning line.

Preferably, the side face of the guide rail ruler body is provided with a large circular rack through hole, when a small-size circular arc is drawn, the large circular arc scribing block can be closer to the circle center rotating shaft, and at the moment, the large circular rack penetrates out of the large circular rack through hole, so that the large circular arc scribing block obtains a larger stroke.

Preferably, the centers of circles of the telescopic needle rod, the telescopic marking pen and the marking pen head are arranged in a collinear manner, and the adjusting direction of the position adjusting cross rod is parallel to the connecting line of the telescopic needle rod, the telescopic marking pen and the marking pen head.

Preferably, the ratio of the nominal diameters of the bull gear and the pinion gear is 1: 2. 1: 4. 1: 5 or 1: 10, the ratio of the scale density of the small circle scale bar to the scale density of the large circle scale bar is the same as the ratio of the nominal diameter.

Preferably, the circle center rotating shaft is made of transparent materials, so that the position of the circle center can be observed conveniently.

Preferably, the large sliding block is provided with a scale pointer.

A drawing method of a safety compass ruler adopts the safety compass ruler to draw, and comprises the following drawing methods:

a. drawing a large circular arc: 1. loosening the fastening knob, sliding the large arc marking block, and sliding the scale pointer to a large arc scale bar with the radius of the arc to be drawn; 2. screwing down the fastening knob, pressing down the pressing cap to extend the telescopic needle rod through the telescopic locking mechanism, pressing the telescopic needle rod at the center of a circular arc to be drawn, and pressing down the telescopic marking pen to expose the pen core; 3. pressing the circle center rotating shaft with one hand, and holding the telescopic marking pen with the other hand to draw a circle; 4. after the circular arc is drawn, the pressing cap is pressed down again to retract the telescopic needle rod through the telescopic locking mechanism, and the telescopic marking pen is pressed down again to retract the pen core;

b. position calibration before drawing of the small circular arc: 1. loosening the fastening knob and sliding the large arc scribing block, wherein when the large arc scribing block slides, the small arc scribing block simultaneously performs reverse sliding due to the action of the double-layer gear, the large circular rack and the small circular rack, and when a positioning line at the top of the small sliding block is aligned with a calibration positioning line of the guide rail ruler body, the sliding of the large arc scribing block is stopped, and the fastening knob is screwed down; 2. rotating the marking pen head to enable the pen core to extend out of the marking groove, pressing down the pressing cap to extend the telescopic needle rod through the telescopic locking mechanism, and pressing the telescopic needle rod at the circle center of the arc to be drawn; 3. one hand presses the circle center rotating shaft, and the other hand holds the guide rail ruler body to draw a circle; 4. After drawing, measuring the diameter of the arc, calculating the radius of the arc, and comparing the radius with the calibration positioning line scale; 5. if the comparison result has deviation, rotating the adjusting nut to finely adjust the position of the cross rod, and re-drawing a circle to measure the radius until the diameter of the circular arc is accurate;

c. drawing a small arc: 1. loosening the fastening knob, sliding the large arc marking block, and sliding the scale pointer to a small circle scale bar with the arc radius to be drawn; 2. rotating the marking pen head to enable the pen core to extend out of the marking groove, pressing down the pressing cap to extend the telescopic needle rod through the telescopic locking mechanism, and pressing the telescopic needle rod at the circle center of the arc to be drawn; 3. one hand presses the circle center rotating shaft, and the other hand holds the guide rail ruler body to draw a circle; 4. after the circular arc is drawn, the pressing cap is pressed again to retract the telescopic needle rod through the telescopic locking mechanism, and the scribing pen point is rotated to retract the pen core into the scribing groove;

d. drawing the arc in proportion: 1. and (3) scaling up and drawing: sliding the small arc scribing block to measure the arc size and then drawing by using the large arc scribing block; 2. and (3) scaling down and drawing: and sliding the large arc scribing block or measuring the size of the arc and then drawing by using the small arc scribing block.

To sum up, the utility model has the advantages that:

① A safety compass ruler integrates the ruler circle together, is more portable, in addition, hides nib and needle bar through the lift design of button, has improved and has carried the security of depositing the in-process.

② a safe compasses chi, draw the in-process drawing pen position at the circular arc and can remain stable, the circular arc homogeneity of drawing is good in addition, through double-deck gear and rack structure, can draw big or small circular arc in grades, drawing precision to the small radius circular arc is high, solved traditional student with the compasses draw the problem that the in-process size is inaccurate to influence the mapping quality at the small radius circular arc.

③ A safety compass ruler, which can be used for drawing an arc with equal scale enlargement and reduction.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is an assembly schematic of the present invention;

FIG. 3 is a schematic structural view of the small arc scribing block of the present invention;

fig. 4 is a schematic structural view of the large circular rack through hole of the present invention.

Detailed Description

The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.

The present invention will be described in detail by way of examples with reference to the accompanying drawings.

Example 1:

as shown in fig. 1 to 4, a safety compass ruler includes: the guide rail ruler comprises a guide rail ruler body 1, a circle center rotating shaft 2, a large arc scribing block 3 and a small arc scribing block 4.

The circle center rotating shaft 2 comprises a button disc 21 and a shaft body 22, a double-layer gear 23 is sleeved outside the shaft body 22, the double-layer gear 23 comprises a large gear 231 and a small gear 232 which are fixed concentrically, a pressing cap 213 is arranged at the top of the button disc 21 of the circle center rotating shaft 2, a telescopic needle rod 24 and a telescopic locking mechanism for controlling the telescopic needle rod 24 to extend out and retract are arranged in the shaft body 22, and the circle center rotating shaft 2 is made of transparent materials.

The inner side of the guide rail ruler body 1 is provided with a disc groove 11 and a slide rail 12, a circle center rotating shaft 2 is rotatably connected with the guide rail ruler body 1 through the disc groove 11, the upper surface of the guide rail ruler body 1 is provided with two rows of scale strips 13 which are respectively a large circle scale strip and a small circle scale strip, the top of the guide rail ruler body 1 is provided with a slide block groove 14, and the bottom of the guide rail ruler body 1 is provided with a marking groove 15;

the large circular arc scribing block 3 is connected with the circle center rotating shaft 2 through a large circular rack 5, one end of the large circular rack 5 is fixedly connected with the large circular arc scribing block 3, and the other end of the large circular rack is meshed with the large gear 231 on the circle center rotating shaft 2; the small arc scribing block 4 is connected with the circle center rotating shaft 2 through a small rack 6, one end of the small rack 6 is fixedly connected with the small arc scribing block 4, and the other end of the small rack is meshed with a pinion 232 on the circle center rotating shaft 2; the large arc scribing block 3 and the small arc scribing block 4 are respectively arranged at two sides of the circle center rotating shaft 2, the large circular rack 5 and the small circular rack 6 are oppositely arranged and are fixed in the guide rail ruler body 1 in a sliding mode through the sliding rail 12, and the scale bar 13 is arranged on the side of the large arc scribing block 3.

The large arc scribing block 3 comprises a large sliding block 31, a fastening knob 32 and a telescopic scribing pen 33, wherein the pen point of the telescopic scribing pen 33 is arranged in a scribing groove 15, a scale pointer 34 is arranged on the large sliding block 31, the small arc scribing block 4 comprises a small sliding block 41, a positioning cross rod 42, a scribing pen head 43 and an adjusting nut 44, the scribing pen head 43 is hinged to the top of the positioning cross rod 42, a protrusion and a notch for positioning are arranged between the scribing pen head 43 and the top of the positioning cross rod 42, the adjusting nut 44 finely adjusts the positioning cross rod 42 through a threaded transmission part arranged inside the small sliding block 41, the positioning cross rod 42 and the scribing pen head 43 are arranged in the scribing groove 15, a calibration positioning line 16 is arranged on one side, located on the small arc scribing block 4, of the guide rail ruler body 1, a large circular rack through hole 17 is arranged on the side face of the guide rail ruler body 1, a telescopic needle rod 24 is arranged on the, The centers of the telescopic marking pen 33 and the marking pen head 43 are arranged in a collinear way, and the adjusting direction of the positioning cross rod 42 is parallel to the connecting line of the telescopic marking pen 33 and the marking pen head 43.

In this example, the ratio of the nominal diameters of the bull gear 231 and the pinion gear 232 is 1: and 5, the ratio of the scale density of the small circle scale bar to the scale density of the large circle scale bar is the same as the ratio of the nominal diameter, and the scale ranges of the small circle scale bar and the large circle scale bar are 0-5cm and 5-30cm respectively.

The safety compass ruler is used for drawing, and comprises the following drawing methods:

a. drawing a large circular arc: 1. loosening the fastening knob 32, sliding the large circular arc marking block 3, and sliding the scale pointer 34 to the large circular scale strip with the circular arc radius to be drawn; 2. the fastening knob 32 is screwed down, the pressing cap 213 is pressed down to extend the telescopic needle rod 24 through the telescopic locking mechanism, the telescopic needle rod 24 is pressed at the circle center of the circular arc to be drawn, and the telescopic marking pen 33 is pressed down to expose the pen core; 3. one hand presses the circle center rotating shaft 2, and the other hand holds the telescopic marking pen 33 to draw a circle; 4. after the circular arc is drawn, the pressing cap 213 is pressed again to retract the telescopic needle rod 24 through the telescopic locking mechanism, and the telescopic marking pen 33 is pressed again to retract the pen core;

b. position calibration before drawing of the small circular arc: 1. loosening the fastening knob 32 and sliding the large arc scribing block 3, wherein when the large arc scribing block 3 slides, the small arc scribing block 4 slides reversely due to the action of the double-layer gear 23, the large circular rack 5 and the small circular rack 6, and when the positioning line 411 at the top of the small sliding block 41 is aligned with the calibration positioning line 16 of the guide rail ruler body 1, stopping sliding the large arc scribing block 3 and screwing the fastening knob 32; 2. rotating the scribing pen point 43 to enable the pen core to extend out of the scribing groove 15, pressing down the pressing cap 213 to extend the telescopic needle rod 24 through the telescopic locking mechanism, and pressing the telescopic needle rod 24 at the circle center of the circular arc to be drawn; 3. one hand presses the circle center rotating shaft 2, and the other hand holds the guide rail ruler body 1 to draw a circle; 4. after drawing, measuring the diameter of the arc, calculating the radius of the arc, and comparing the radius with the 16-scale calibration positioning line; 5. if the comparison result has deviation, the adjusting nut 44 is rotated to finely adjust the position of the positioning cross rod 42, and the circle is drawn again to measure the radius until the diameter of the circular arc is accurate;

c. drawing a small arc: 1. loosening the fastening knob 32, sliding the large arc marking block 3, and sliding the scale pointer 34 to a small circle scale bar with the size of the arc radius to be drawn; 2. rotating the scribing pen point 43 to enable the pen core to extend out of the scribing groove 15, pressing down the pressing cap 213 to extend the telescopic needle rod 24 through the telescopic locking mechanism, and pressing the telescopic needle rod 24 at the circle center of the circular arc to be drawn; 3. one hand presses the circle center rotating shaft 2, and the other hand holds the guide rail ruler body 1 to draw a circle; 4. after the circular arc is drawn, the pressing cap 213 is pressed down again to retract the telescopic needle rod 24 through the telescopic locking mechanism, and the scribing pen point 43 is rotated to retract the pen core into the scribing groove 15;

d. drawing the arc in proportion: 1. drawing at 5 times of magnification: sliding the small arc scribing block 4 to measure the arc size and then drawing by using the large arc scribing block 3; 2. scaling down by 5 times: and sliding the large arc scribing block 3 or measuring the arc size and then drawing by using the small arc scribing block 4.

Claims

1. A safety compass ruler, comprising: the guide rail ruler comprises a guide rail ruler body (1), a circle center rotating shaft (2), a large arc scribing block (3) and a small arc scribing block (4);

the circle center rotating shaft (2) comprises a button disc (21) and a shaft body (22), a double-layer gear (23) is sleeved outside the shaft body (22), the double-layer gear (23) comprises two large gears (231) and a small gear (232) which are fixed concentrically, a press cap (213) is arranged at the top of the button disc (21) of the circle center rotating shaft (2), and a telescopic needle rod (24) and a telescopic locking mechanism for controlling the telescopic needle rod (24) to extend out and retract are arranged in the shaft body (22);

the guide rail ruler is characterized in that a disc groove (11) and a slide rail (12) are arranged on the inner side of the guide rail ruler body (1), the circle center rotating shaft (2) is rotatably connected with the guide rail ruler body (1) through the disc groove (11), two rows of scale strips (13) are arranged on the upper surface of the guide rail ruler body (1) and are respectively a large circle scale strip and a small circle scale strip, a slide block groove (14) is formed in the top of the guide rail ruler body (1), and a scribing groove (15) is formed in the bottom of the guide rail ruler body (1);

the large circular arc scribing block (3) is connected with the circle center rotating shaft (2) through a large circular rack (5), one end of the large circular rack (5) is fixedly connected with the large circular arc scribing block (3), and the other end of the large circular rack is meshed with a large gear (231) on the circle center rotating shaft (2); the small circular arc scribing block (4) is connected with the circle center rotating shaft (2) through a small circular rack (6), one end of the small circular rack (6) is fixedly connected with the small circular arc scribing block (4), and the other end of the small circular rack is meshed with a pinion (232) on the circle center rotating shaft (2);

the large arc scribing block (3) and the small arc scribing block (4) are respectively arranged on two sides of the circle center rotating shaft (2), the large circular rack (5) and the small circular rack (6) are arranged in opposite directions and are fixed in the guide rail ruler body (1) in a sliding mode through the sliding rail (12), and the scale strip (13) is arranged on the side of the large arc scribing block (3).

2. A safety compass ruler according to claim 1, wherein the great circle segment scribing block (3) comprises a great slide block (31), a fastening knob (32) and a telescopic scribing pen (33).

3. A safety compass ruler according to claim 2, wherein the small circular arc marking block (4) comprises a small slide block (41), a positioning cross bar (42), a marking nib (43) and an adjusting nut (44), the marking nib (43) is hinged on the top of the positioning cross bar (42), and a protrusion and a notch for positioning are arranged between the marking nib (43) and the top of the positioning cross bar (42).

4. A safety compass ruler according to claim 3, wherein the guide ruler body (1) is provided with a calibration positioning line (16) at one side of the small circular arc marking block (4), and a positioning line (411) is arranged at the top of the small sliding block (41).

5. A safety compass ruler according to claim 1, wherein the guide rail ruler body (1) is provided with a large circular rack through hole (17) in a side thereof.

6. A safety compass according to claim 3, wherein the centres of the telescopic needle bar (24), the telescopic scribe pen (33) and the scribe head (43) are arranged co-linearly, the adjustment direction of the positioning crossbar (42) being parallel to the line joining the three.

7. A safety compass according to claim 1, wherein the ratio of the nominal diameters of the bull gear (231) and the pinion gear (232) is 1: 2. 1: 4. 1: 5 or 1: 10, the ratio of the scale density of the small circle scale bar to the scale density of the large circle scale bar is the same as the ratio of the nominal diameter.

8. A safety compass ruler according to claim 1, wherein the circle centre rotating shaft (2) is made of transparent material.

9. A safety compass ruler according to claim 2, wherein the large slider (31) is provided with a scale pointer (34).