CN108297580B - A scalable scale - Google Patents

Abstract

The invention discloses a retractable measuring ruler, comprising a horizontal ruler and two moving rulers slidingly sleeved on the horizontal ruler. The horizontal ruler and the moving ruler are respectively marked with scale lines, and the two moving rulers can be respectively directed toward the horizontal ruler. Both ends slide, and a first positioning device is arranged between the moving ruler and the horizontal ruler; a sliding sleeve is arranged on the sliding sleeve on each moving ruler, and a second positioning device is arranged between the moving ruler and the sliding sleeve; The sliding assembly is provided with a vertical rod, and a third positioning device is arranged between the sliding sleeve and the vertical rod; the lower end of each vertical rod is provided with a steel needle or a line drawing pen, between the steel needle or line drawing pen and the vertical rod A fourth positioning device is provided. The retractable measuring gauge of the present invention is suitable for the annular surface with different heights in the center and the surrounding, combining the measuring gauge and the scribing into one, without changing the tool, the functions of measuring and scribing can be realized, and can be used for measuring and scribing. Accurate drawing of the scalloped hole in the middle of the sprocket model.

Description

A scalable scale

technical field

The invention belongs to the technical field of model processing, and in particular relates to a retractable gauge.

Background technique

When making the fan-shaped hole in the middle of the sprocket model, due to the existence of the intermediate hub, the fan-shaped hole is not easy to draw. Even if a compass is used to draw a line at a high position, the accuracy of its size is not easy to measure. When measuring with a card, it is hindered by the outer ring of the sprocket model, and when measuring with a wild card, it is hindered by the hub of the sprocket model.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a retractable measuring gauge, which can realize the precise drawing of the fan-shaped hole in the middle of the sprocket model.

In order to achieve the above object, the present invention adopts the following technical solutions to solve it.

A retractable measuring ruler, comprising: a horizontal ruler and two moving rulers slidably sleeved on the horizontal ruler, the horizontal ruler and the moving ruler are respectively marked with tick marks, and the two moving rulers can be Slide to the two ends of the horizontal ruler respectively, and a first positioning device is arranged between the moving ruler and the horizontal ruler; a sliding sleeve is provided on each moving ruler, and the moving ruler is connected to the sliding sleeve. A second positioning device is arranged between the sleeves; a vertical rod is vertically slidably assembled on each of the sliding sleeves, and a third positioning device is arranged between the sliding sleeve and the vertical rod; The lower end of the straight rod is provided with a steel needle or a line drawing pen, and a fourth positioning device is provided between the steel needle or the line drawing pen and the vertical rod.

According to the retractable measuring ruler of the present invention, the two moving rulers can slide on the horizontal ruler, and scale lines are marked on the moving ruler and the horizontal ruler. When the two moving rulers do not slide on the horizontal ruler, the two moving rulers The tick marks on the horizontal ruler are aligned with the tick marks on the horizontal ruler; two sliding sleeves can slide on the moving ruler, a steel needle is installed at the lower end of the vertical rod on one sliding sleeve, and the lower end of the vertical rod on the other sliding sleeve is installed There is a line drawing pen. By adjusting the sliding distance of the two moving rulers on the horizontal ruler, the horizontal distance between the steel needle and the line drawing pen can be roughly adjusted. Distance, accurately adjust the horizontal distance between the steel needle and the line drawing pen; the vertical rod can slide up and down in the sliding sleeve, which is convenient to adjust the height difference between the steel needle and the line drawing pen, so as to realize the realization of the steel needle and the line drawing pen vertical distance between. When drawing a fan-shaped hole on the sprocket model, first use a steel needle to position a vertical rod at the center of the hub of the sprocket model, and then adjust the other vertical rod and move the ruler and sliding sleeve on the horizontal ruler to ensure that When the line drawing pen touches the rim of the sprocket model, the horizontal ruler and the moving ruler are in a horizontal state. At the same time, you can refer to the scales on the horizontal ruler and the moving ruler to accurately locate the position of the line drawing pen, and then make the line drawing pen use the needle. Draw the inner and outer arc sides of the fan-shaped hole for the center of the circle.

The retractable measuring gauge of the invention combines the measuring gauge and the scribing into one, and can realize the functions of measuring and scribing without changing the tool. Different diameters and sizes; it can also be stretched vertically to achieve dimensional changes in the height direction, and can measure different depths, which greatly expands the specifications and uses of the gauge.

In addition, the scalable gauge provided by the present invention may have the following additional technical features:

Preferably, the first positioning device includes a U-shaped guide rod and a positioning pin, the upper end of the positioning pin is provided with a guide hole; one end of the U-shaped guide rod is fixedly connected to the moving ruler, and the U-shaped guide rod The other end of the U-shaped guide rod extends into the guide hole, the middle of the end of the U-shaped guide rod that extends into the guide hole is provided with a thread, the thread is equipped with a nut, and the nut is fixedly connected with a thread. A spring sleeved on the U-shaped guide rod, the spring is connected with the end of the positioning pin; the moving ruler is provided with a through hole, and the horizontal ruler is provided with a plurality of positioning grooves, so The positioning pin passes through the through hole and is matched with the positioning groove.

According to the retractable gauge of the present invention, one end of the U-shaped guide rod can be welded on the moving ruler, and the length of the end of the U-shaped guide rod provided with the thread is shorter; When there is a horizontal distance between the two, one end of the U-shaped guide rod extends into the innermost positioning groove on the horizontal ruler through the through hole on the moving ruler through the positioning pin connected by the spring, and the positioning groove is a conical groove; when When the length of the horizontal ruler cannot meet the horizontal distance between the steel needle and the line drawing pen, it is necessary to move one or two moving rulers to the two sides of the horizontal ruler respectively. At this time, under the action of external force, the spring is compressed to drive the positioning. The pin moves upward at one end of the U-shaped guide rod, so that the positioning pin slips out of the positioning groove. At this time, the moving ruler can slide on the horizontal ruler, so that the horizontal distance between the steel needle and the line drawing pen is lengthened until it reaches the required position. After the distance is required, under the action of the spring restoring force, the positioning pin enters the positioning groove set on the horizontal ruler, so that the moving ruler and the horizontal ruler are locked with each other; the function of the rotating nut is to adjust the tension force of the spring.

Preferably, a plurality of the positioning grooves are arranged at equal intervals.

According to the retractable measuring gauge of the present invention, positioning grooves are arranged at equal intervals on the horizontal ruler, and the distance that the moving ruler moves on the horizontal ruler can be quickly known by the number of positioning grooves, which is convenient for the staff to quickly determine the steel needle and the The rough horizontal distance between the line pens, and finally by adjusting the distance of the sliding sleeve on the moving ruler, accurately determine the horizontal distance between the steel needle and the line pens.

Preferably, the rear side of the sliding sleeve is provided with a transverse sliding hole, the sliding sleeve is slidably sleeved on the moving ruler through the transverse sliding hole, and the front side of the sliding sleeve is also provided with a vertical sliding hole , the vertical rod is slidably assembled in the vertical sliding hole.

According to the retractable gauge of the present invention, the horizontal sliding hole and the vertical sliding hole on the sliding sleeve are orthogonal in space, which can ensure that the horizontal ruler, the moving ruler and the vertical rod are kept vertical. The sliding sleeve can slide along the moving ruler through the horizontal sliding hole to adjust the horizontal position, and the vertical rod can slide in the vertical sliding hole on the sliding sleeve to adjust the vertical position of the steel needle or line drawing pen fixed at the lower end of the sliding sleeve. to the location.

Preferably, the second positioning device includes a first positioning screw and a first screw hole; the first screw hole is arranged on the sliding sleeve, and the first screw hole leads into the lateral sliding hole, The first positioning screw is matched with the first screw hole.

According to the retractable measuring ruler of the present invention, the end of the first positioning screw passes through the first screw hole on the sliding sleeve and then extends into the transverse sliding hole, so that it can be placed on the moving ruler, and the two sliding sleeves can be fixed on the sliding sleeve. Move the position on the ruler.

Preferably, the third positioning device is a self-locking mechanism, and the self-locking mechanism includes a rack and locking helical teeth; the rack is provided on the side wall of the vertical rod, and the sliding sleeve is provided There is a transverse through hole, the transverse through hole leads into the vertical sliding hole, one end of the transverse through hole is equipped with a compression spring bolt, and the other end of the transverse through hole is equipped with the locking helical tooth, so A compression spring is fixedly connected between the locking helical teeth and the compression spring bolt, and the locking helical teeth extend out of the transverse through hole.

Preferably, the end of the transverse through hole is provided with an end cover, the end cover is provided with a threaded hole, and the compression spring bolt is assembled on one end of the transverse through hole through the threaded hole; The inner wall of the through hole is provided with a transverse sliding groove, the end of the compression spring bolt is provided with a push block, the other end of the transverse through hole is equipped with a limit block, and the locking helical teeth are arranged on the limit block One end protruding from the transverse through hole, the compression spring is connected between the push block and the limit block, and the push block and the limit block are respectively slidably assembled in the transverse chute.

According to the retractable gauge of the present invention, the third positioning device is used to fix the position of the vertical rod relative to the sliding sleeve; the sliding sleeve is provided with a transverse through hole, and the transverse through hole leads into the vertical sliding hole; The end is provided with an end cover, the end cover is provided with a threaded hole, the compression spring bolt is assembled on one end of the horizontal through hole through the threaded hole, and the end of the compression spring bolt is provided with a push block, and the width of the two ends of the push block is larger than the diameter of the threaded hole , to prevent the compression spring bolt from falling off the threaded hole, and the push block is fixedly connected with the compression spring; the inner wall of the transverse through hole is provided with a transverse chute, and the limit block and the push block slide and assemble in the transverse chute. When the spring bolt is pressed, the spring bolt makes the push block slide in the direction of the vertical sliding hole in the horizontal sliding groove, pushes the compression spring, and the compression spring pushes the limit block to slide in the direction of the vertical sliding hole in the horizontal sliding groove, thereby Make the locking helical teeth on the limit block extend between the adjacent racks set on the side wall of the vertical rod to lock the relative position of the vertical rod and the sliding sleeve; reversely rotate the compression spring bolt to stretch the compression spring , drive the locking helical teeth to shrink inwards, so that the relative position of the vertical rod and the sliding sleeve is unlocked, and the vertical rod can slide up and down in the sliding sleeve.

Preferably, the third positioning device is a second positioning screw, the sliding sleeve is provided with a second screw hole, the second screw hole leads into the vertical sliding hole, and the second positioning screw match with the second screw hole.

According to the retractable gauge of the present invention, the end of the second positioning screw passes through the second screw hole on the sliding sleeve and then extends into the vertical sliding hole, so that it can be placed on the vertical rod, and the vertical rod can be fixed. The position relative to the sliding sleeve.

Preferably, the cross-section of the moving ruler is a rectangular surface, and the cross-section of the lateral sliding hole matches that of the moving ruler; the cross-section of the vertical rod is a rectangular surface, and the cross-section of the vertical sliding hole is a rectangular surface. Match the cross section of the vertical rod.

According to the telescopic ruler of the present invention, the movable ruler with rectangular cross-section extends into the matching lateral sliding hole, which can ensure that the sliding sleeve does not rotate relative to the movable ruler, and can ensure that the two sliding sleeves can be moved by the same movable ruler. on the same vertical plane. The vertical rod with rectangular section extends into the matching vertical sliding hole, which can ensure that the vertical rod will not rotate relative to the sliding sleeve, and can ensure that the needle point of the steel needle fixed at the lower end of the sliding sleeve and the pen point of the line drawing pen are between. The connecting line between them is parallel to the horizontal ruler, and the distance between the tip of the steel needle and the tip of the line drawing pen can be determined by the scale on the horizontal ruler. In addition, the cross section of the moving ruler and the vertical rod of the present invention may be a non-circular surface such as a triangular surface or a polygonal surface.

Preferably, a connecting sleeve is fixed on one side of the lower end of the vertical rod, and the steel needle and the line drawing pen are respectively assembled in the connecting sleeve.

According to the retractable gauge of the present invention, a connecting sleeve is fixed on one side of the lower end of the vertical rod, the lower end of the connecting sleeve is open, and the upper end is a blind end. The steel needle or line drawing pen can be directly loaded into the connecting sleeve, and the operation is relatively simple.

Preferably, the fourth positioning device includes a third positioning screw and a third screw hole; the connecting sleeve is fixed on one side of the vertical rod, and the third screw is provided at the lower end of the vertical rod The third screw hole is inserted into the connecting sleeve, and the third positioning screw extends into the connecting sleeve after passing through the third screw hole.

According to the retractable gauge of the present invention, one side of the connecting sleeve is connected with one side of the lower end of the vertical rod, the third screw hole penetrates the vertical rod and the connecting sleeve, and the third positioning screw is screwed into the third screw After the hole is inserted into the connecting sleeve, the steel needle or the line drawing pen can be fixed in the connecting sleeve.

Description of drawings

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is the front structure schematic diagram of an embodiment of the telescopic gauge of the present invention;

Fig. 2 is the cross-sectional structure schematic diagram of the horizontal ruler and the moving ruler positioned by the first positioning device in the retractable gauge of Fig. 1;

Fig. 3 is the sectional structure schematic diagram of the vertical rod and the sliding sleeve positioned by the third positioning device in the telescopic gauge of Fig. 1;

FIG. 4 is a left-view structural schematic diagram of an embodiment of the retractable gauge of the present invention.

In the above picture: 1 horizontal ruler; 2 moving ruler; 3 sliding sleeve; 4 vertical rod; 5 steel needle; 6 line drawing pen; 7 U-shaped guide rod; 8 positioning pin; 801 guide hole; ;11 Positioning groove;12 First positioning screw;13 Rack;14 Compression spring bolt;15 Locking helical tooth;16 Compression spring;17 End cover;18 Lateral sliding slot;19 Push block;20 Limit block; connecting sleeve; 22 third set screw; 23 second set screw.

Detailed ways

Referring to Figures 1 and 4, a retractable measuring ruler includes: a horizontal ruler 1 and two moving rulers 2 that are slidably sleeved on the horizontal ruler 1, and the horizontal ruler 1 and the moving ruler 2 are respectively Marked with tick marks, the two moving rulers 2 can slide toward both ends of the horizontal ruler 1 respectively, and a first positioning device is provided between the moving ruler 2 and the horizontal ruler 1; A sliding sleeve 3 is slidably sleeved on the ruler 2, and a second positioning device is arranged between the moving ruler 2 and the sliding sleeve 3; A third positioning device is provided between the sliding sleeve 3 and the vertical rod 4; the lower end of each vertical rod 4 is provided with a steel needle 5 or a line drawing pen 6, and the steel needle 5 or line drawing pen 6 A fourth positioning device is arranged between the vertical rod 4 .

In the above embodiment, the moving ruler 2 is provided with a horizontal sliding hole, the moving ruler 2 is sleeved on the horizontal ruler 1 through the horizontal sliding hole, and the two moving rulers 2 can slide on the horizontal ruler 1, which expands the measurement of the horizontal ruler 1. Scale lines are marked on both the moving ruler 2 and the horizontal ruler 1. When the two moving rulers 2 do not slide on the horizontal ruler 1, the tick marks of the two moving rulers 2 are aligned with the tick marks on the horizontal ruler 1; The sliding sleeves 3 can slide on the moving ruler 2, a steel needle 5 is installed on the lower end of the vertical rod 4 on one sliding sleeve 3, and a line drawing pen 6 is installed on the lower end of the vertical rod 4 on the other sliding sleeve 3. By adjusting the sliding distance of the two moving rulers 2 on the horizontal ruler 1, the horizontal distance between the steel needle 5 and the line drawing pen 6 can be roughly adjusted. After the rough adjustment, the two sliding sleeves 3 can be adjusted on the moving ruler 2. The distance between the steel needle 5 and the line drawing pen 6 can be adjusted accurately; the vertical rod 4 can slide up and down in the sliding sleeve 3, which is convenient to adjust the height difference between the steel needle 5 and the line drawing pen 6, so as to The vertical distance between the steel needle 5 and the line drawing pen 6 is realized. This retractable gauge can be used to draw fan-shaped holes on the sprocket model. First, use the steel needle 5 to position a vertical rod 4 at the center of the hub of the sprocket model, and then adjust the other vertical rod on the horizontal ruler 1. The straight rod 4, the moving ruler 2 and the sliding sleeve 3 ensure that when the line drawing pen 6 contacts the rim of the sprocket model, the horizontal ruler 1 and the moving ruler 2 are in a horizontal state. The scale accurately locates the position of the line drawing pen 6, and then the line drawing pen 6 draws the inner and outer arc edges of the fan-shaped hole with the steel needle 5 as the center of the circle.

The retractable measuring gauge of the invention combines the measuring gauge and the scribing into one, and can realize the functions of measuring and scribing without changing the tool. Different diameters and sizes; it can also be stretched vertically to achieve dimensional changes in the height direction, and can measure different depths, which greatly expands the specifications and uses of the gauge.

In addition, the rubric provided by the present invention may have the following additional embodiments:

2, according to an embodiment of the present invention, the first positioning device includes a U-shaped guide rod 7 and a positioning pin 8, and the upper end of the positioning pin 8 is provided with a guide hole 801; One end is fixedly connected to the moving ruler 2, the other end of the U-shaped guide rod 7 extends into the guide hole 801, and the middle of the end of the U-shaped guide rod 7 that extends into the guide hole 801 is provided There is a thread, a nut 9 is assembled on the thread, and a spring 10 sleeved on the U-shaped guide rod 7 is fixedly connected to the nut 9, and the spring 10 is connected with the end of the positioning pin 8; The moving ruler 2 is provided with through holes, the horizontal ruler 1 is provided with a plurality of positioning grooves 11 , and the positioning pins 8 pass through the through holes to match with the positioning grooves 11 .

In the above embodiment, one end of the U-shaped guide rod 7 can be welded on the moving ruler 2, and the length of one end of the U-shaped guide rod 7 provided with the thread is shorter; when the length of the horizontal ruler 1 can meet the requirements of the steel needle 5 and the drawing line When there is a horizontal distance between the pens 6, the positioning pin 8 connected at one end of the U-shaped guide rod 7 through the spring 10 passes through the through hole on the moving ruler 2 and extends into the innermost positioning groove 11 on the horizontal ruler 1. The groove 11 is a conical groove; when the length of the horizontal ruler 1 cannot meet the horizontal distance between the steel needle 5 and the line drawing pen 6, it is necessary to make one or two moving rulers 2 move to both sides of the horizontal ruler 1 respectively. , at this time, under the action of external force, the spring 10 is compressed, which drives the positioning pin 8 to move upward at one end of the U-shaped guide rod 7, so that the positioning pin 8 slips out of the positioning groove 11. At this time, the moving ruler 2 can be moved on the horizontal ruler. 1, to lengthen the horizontal distance between the steel needle 5 and the line drawing pen 6 until the required distance is reached, under the action of the restoring force of the spring 10, the positioning pin 8 enters the positioning groove 11 set on the horizontal ruler 1 Inside, the moving ruler 2 and the horizontal ruler 1 are locked with each other; the function of the rotating nut 9 is to adjust the tension force of the spring 10 .

Referring to FIG. 2 , according to an embodiment of the present invention, a plurality of the positioning grooves 11 are arranged at equal intervals.

In the above embodiment, the positioning grooves 11 are arranged at equal intervals on the horizontal ruler 1. For example, a positioning groove 11 is arranged on the horizontal ruler 1 every 10 mm, and the distance moved by the moving ruler 2 on the horizontal ruler 1 can be determined by positioning The number of grooves 11 can be quickly known, which is convenient for the staff to quickly determine the rough horizontal distance between the steel needle 5 and the line drawing pen 6. Finally, by adjusting the distance of the sliding sleeve 3 on the moving ruler 2, the steel needle 5 can be accurately determined. and the horizontal distance between the liner 6.

Referring to FIGS. 1 and 4 , according to an embodiment of the present invention, the rear side of the sliding sleeve 3 is provided with a transverse sliding hole, and the sliding sleeve 3 is slidably sleeved on the moving ruler 2 through the transverse sliding hole. The front side of the sliding sleeve 3 is also provided with a vertical sliding hole, and the vertical rod 4 is slidably assembled in the vertical sliding hole.

In the above embodiment, the horizontal sliding hole and the vertical sliding hole on the sliding sleeve 3 are orthogonal in space, which can ensure that the horizontal ruler 1, the moving ruler 2 and the vertical rod 4 remain vertical, but do not interfere. The sliding sleeve 3 can slide along the moving ruler 2 through the lateral sliding hole to adjust the lateral position, and the vertical rod 4 can slide in the vertical sliding hole on the sliding sleeve 3 to adjust the steel needle 5 or The vertical position of the line drawing pen 6.

1 and 4, according to an embodiment of the present invention, the second positioning device includes a first positioning screw 12 and a first screw hole; the first screw hole is provided on the sliding sleeve 3, the The first screw hole leads into the transverse sliding hole, and the first positioning screw 12 is matched with the first screw hole.

In the above embodiment, the end of the first positioning screw 12 passes through the first screw hole on the sliding sleeve 3 and then extends into the lateral sliding hole, so that it can be placed on the moving ruler 2, and the two sliding sleeves 3 can be fixed in the horizontal sliding hole. Move the position on ruler 2.

Referring to FIG. 3 , according to another embodiment of the present invention, the third positioning device is a self-locking mechanism, and the self-locking mechanism includes a rack 13 and a locking helical tooth 15 ; The rack 13 is provided, the sliding sleeve 3 is provided with a transverse through hole, the transverse through hole leads into the vertical sliding hole, and one end of the transverse through hole is equipped with a compression spring bolt 14. The other end of the transverse through hole is assembled with the locking helical teeth 15 , a compression spring 16 is fixedly connected between the locking helical teeth 15 and the compression spring bolt 14 , and the locking helical teeth 15 protrude out of the transverse direction. through hole.

Referring to FIG. 3 , according to another embodiment of the present invention, an end cover 17 is provided at the end of the lateral through hole, and a threaded hole is provided on the end cover 17 , and the compression spring bolt 14 is assembled through the threaded hole. One end of the transverse through hole; the inner wall of the transverse through hole is provided with a transverse sliding groove 18, the end of the compression spring bolt 14 is provided with a push block 19, and the other end of the transverse through hole is assembled with a limit Block 20, the locking helical tooth 15 is arranged on the end of the limit block 20 extending out of the transverse through hole, the compression spring 16 is connected between the push block 19 and the limit block 20, The push block 19 and the limit block 20 are respectively slidably assembled in the transverse chute 18 .

In the above embodiment, the third positioning device is used to fix the position of the vertical rod 4 relative to the sliding sleeve 3; the sliding sleeve 3 is provided with a transverse through hole, and the transverse through hole leads into the vertical sliding hole; the end of the transverse through hole The end cover 17 is provided on the end cover, the end cover 17 is provided with a threaded hole, the compression spring bolt 14 is assembled on one end of the transverse through hole through the threaded hole, and the end of the compression spring bolt 14 is provided with a push block 19. The width of the two ends of the push block 19 Larger than the diameter of the threaded hole, to prevent the compression spring bolt 14 from falling off the threaded hole, the push block 19 is fixedly connected to the compression spring 16; the inner wall of the transverse through hole is provided with a transverse sliding groove 18, the limit block 20 and the push block 19 are Sliding assembly in the transverse chute 18, when the compression spring bolt 14 is rotated inward, the compression spring bolt 14 makes the push block 19 slide in the direction of the vertical sliding hole in the transverse chute 18, pushing the compression spring 16, and the compression spring 16 pushes the limit The positioning block 20 slides in the direction of the vertical sliding hole in the lateral sliding groove 18, so that the locking helical teeth 15 on the limiting block 20 extend between the adjacent racks 13 provided on the side wall of the vertical rod 4, Lock the relative position of the vertical rod 4 and the sliding sleeve 3; reversely rotate the compression spring bolt 14, the compression spring 16 expands, and drive the locking helical teeth 15 to contract inwardly, so as to make the relative position of the vertical rod 4 and the sliding sleeve 3 Unlocking, the vertical rod 4 can slide up and down in the sliding sleeve 3 .

4 , according to another embodiment of the present invention, the third positioning device includes a second positioning screw 23 and a second screw hole; the sliding sleeve 3 is provided with the second screw hole, and the second screw The hole leads into the vertical sliding hole, and the second positioning screw 23 is matched with the second screw hole.

In the above embodiment, the end of the second positioning screw 23 passes through the second screw hole on the sliding sleeve 3 and then extends into the vertical sliding hole, that is, it can be placed on the vertical rod 4 and the vertical rod 4 can be fixed. The position relative to the sliding sleeve 3.

Referring to FIG. 4 , according to another embodiment of the present invention, the cross section of the moving ruler 2 is a rectangular surface, the cross section of the lateral sliding hole matches the cross section of the moving ruler 2 ; the cross section of the vertical rod 4 It is a rectangular surface, and the section of the vertical sliding hole matches that of the vertical rod 4 .

In the above embodiment, the moving ruler 2 with rectangular cross-section extends into the matching lateral sliding hole, which can ensure that the sliding sleeve 3 will not rotate relative to the moving ruler 2, and can ensure that the two sliding sleeves 3 can be connected to the same moving ruler 2. on the same vertical plane. The vertical rod 4 with rectangular cross-section extends into the matching vertical sliding hole, which can ensure that the vertical rod 4 will not rotate relative to the sliding sleeve 3, and can ensure that the needle tip and drawing of the steel needle 5 fixed at the lower end of the sliding sleeve 3 can be ensured. The line connecting the nibs of the line pen 6 is parallel to the horizontal ruler 1 , and the distance between the needle point of the steel needle 5 and the nib of the line drawing pen 6 can be determined by the scale on the horizontal ruler 1 . In addition, the cross section of the moving ruler and the vertical rod of the present invention may be a non-circular surface such as a triangular surface or a polygonal surface.

1 and 4, according to another embodiment of the present invention, a connecting sleeve 21 is fixed on one side of the lower end of the vertical rod 4, and the steel needle 5 and the line drawing pen 6 are respectively assembled in the into the connecting sleeve 21.

In the above embodiment, the connecting sleeve 21 is fixed on one side of the lower end of the vertical rod 4 , the lower end of the connecting sleeve 21 is open, and the upper end is a blind end, and the steel needle 5 or the line drawing pen 6 is fixed on the lower end of the vertical rod 4 At this time, the steel needle 5 or the line drawing pen 6 can be directly inserted into the connecting sleeve 21, and the operation is relatively simple.

4, according to another embodiment of the present invention, the fourth positioning device includes a third positioning screw 22 and a third screw hole, the connecting sleeve 21 is fixed on one side of the vertical rod 4, so The lower end of the vertical rod 4 is provided with the third screw hole, the third screw hole passes into the connecting sleeve 21, and the third positioning screw 22 passes through the third screw hole and then extends into the third screw hole. into the connecting sleeve 21.

In the above embodiment, one side of the connecting sleeve 21 is connected with one side of the lower end of the vertical rod 4, the third screw hole penetrates the vertical rod 4 and the connecting sleeve 21, and the third positioning screw 22 is screwed into the third screw The screw hole extends into the connecting sleeve 21 , and the steel needle 5 or the line drawing pen 6 can be fixed in the connecting sleeve 21 .

In the above embodiment, the moving ruler 2 is also provided with a leveling bubble to adjust the level of the moving ruler 2 to ensure that the horizontal ruler 1 and the moving ruler 2 are parallel to the measured plane.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these changes and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims (8)

1. A retractable gauge, characterized in that it comprises: a horizontal ruler (1) and two moving rulers (2) that are slidably sleeved on the horizontal ruler (1), the horizontal ruler (1) and The moving rulers (2) are respectively marked with tick marks, and the two moving rulers (2) can slide toward the two ends of the horizontal ruler (1) respectively, and the moving rulers (2) and the horizontal ruler A first positioning device is arranged between (1); a sliding sleeve (3) is provided on each moving ruler (2), and a sliding sleeve (3) is arranged between the moving ruler (2) and the sliding sleeve (3). A second positioning device; a vertical rod (4) is vertically slidably assembled on each of the sliding sleeves (3), and a third positioning device is arranged between the sliding sleeve (3) and the vertical rod (4). device; the lower end of each vertical rod (4) is provided with a steel needle (5) or a line drawing pen (6), the steel needle (5) or line drawing pen (6) and the vertical rod ( 4) A fourth positioning device is arranged between; The first positioning device includes a U-shaped guide rod (7) and a positioning pin (8), the upper end of the positioning pin (8) is provided with a guide hole (801); one end of the U-shaped guide rod (7) is fixed Connected to the moving ruler (2), the other end of the U-shaped guide rod (7) extends into the guide hole (801), and the U-shaped guide rod (7) extends into the guide hole The middle of one end of (801) is provided with a thread, a nut (9) is assembled on the thread, and a spring (10) sleeved on the U-shaped guide rod (7) is fixedly connected to the nut (9), The spring (10) is connected with the end of the positioning pin (8); the moving ruler (2) is provided with a through hole, and the horizontal ruler (1) is provided with a plurality of positioning grooves (11). ), the positioning pin (8) is matched with the positioning groove (11) through the through hole; the positioning groove is a conical groove; The rear side of the sliding sleeve (3) is provided with a transverse sliding hole, the sliding sleeve (3) is slidably sleeved on the moving ruler (2) through the transverse sliding hole, and the sliding sleeve (3) is A vertical sliding hole is also provided on the front side, and the vertical rod (4) is slidably assembled in the vertical sliding hole; the horizontal sliding hole and the vertical sliding hole on the sliding sleeve (3) are spatially aligned pay; The retractable ruler is used for accurate drawing of the fan-shaped hole in the middle of the sprocket model. 2 . The retractable gauge according to claim 1 , wherein a plurality of the positioning grooves ( 11 ) are arranged at equal intervals. 3 . 3. The retractable gauge according to claim 1, wherein the second positioning device comprises a first positioning screw (12) and a first screw hole, and the first screw hole is provided on the slide On the sleeve (3), the first screw hole leads into the transverse sliding hole, and the first positioning screw (12) is matched with the first screw hole. 4. The retractable gauge according to claim 1, wherein the third positioning device is a self-locking mechanism, and the self-locking mechanism comprises a rack (13) and a locking helical tooth (15); The rack (13) is provided on the side wall of the vertical rod (4), the sliding sleeve (3) is provided with a transverse through hole, and the transverse through hole leads into the vertical sliding hole, One end of the lateral through hole is fitted with a compression spring bolt (14), and the other end of the lateral through hole is fitted with the locking helical tooth (15), the locking helical tooth (15) and the compression spring bolt A compression spring (16) is fixedly connected between (14), and the locking helical teeth (15) protrude out of the transverse through hole. 5 . The retractable gauge according to claim 4 , wherein an end cover ( 17 ) is provided at the end of the transverse through hole, and a threaded hole is provided on the end cover ( 17 ), and the A compression spring bolt (14) is assembled on one end of the transverse through hole through the threaded hole; a transverse sliding groove (18) is provided on the inner wall of the transverse through hole, and an end of the compression spring bolt (14) is provided with There is a push block (19), the other end of the lateral through hole is equipped with a limit block (20), and the locking helical teeth (15) are arranged on the position where the limit block (20) protrudes from the lateral through hole. At one end, the compression spring (16) is connected between the push block (19) and the limit block (20), and the push block (19) and the limit block (20) are respectively in the Sliding assembly in the transverse chute (18). 6. The retractable measuring ruler according to any one of claims 3-5, wherein the cross section of the moving ruler (2) is a rectangular surface, and the cross section of the lateral sliding hole is the same as the moving ruler The cross-section of (2) is matched; the cross-section of the vertical rod (4) is a rectangular surface, and the cross-section of the vertical sliding hole is matched with the cross-section of the vertical rod (4). 7. The retractable gauge according to claim 1, wherein a connecting sleeve (21) is fixed on one side of the lower end of the vertical rod (4), and the steel needle (5) and all The line drawing pens (6) are respectively assembled in the connecting sleeves (21). 8. The retractable gauge according to claim 7, wherein the fourth positioning device comprises a third positioning screw (22) and a third screw hole; the connecting sleeve is fixed on the vertical On one side of the rod (4), the lower end of the vertical rod (4) is provided with the third screw hole, the third screw hole passes into the connecting sleeve (21), and the third positioning screw (22) extends into the connecting sleeve (21) after passing through the third screw hole.

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