CN219154095U

CN219154095U - Compasses with lockable distance between two feet

Info

Publication number: CN219154095U
Application number: CN202223471085.0U
Authority: CN
Inventors: 陈佳润; 高海涛
Original assignee: Deli Group Co Ltd
Current assignee: Deli Group Co Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-06-09
Anticipated expiration: 2032-12-26

Abstract

The utility model discloses a pair of compasses with lockable feet distance, which comprises a compasses seat, a first supporting leg and a second supporting leg, wherein the first supporting leg and the second supporting leg are both rotationally connected with the compasses seat, a transmission piece is arranged between the first supporting leg and the second supporting leg, so that the first supporting leg, the second supporting leg and the transmission piece are linked, a clamping part sleeved with the transmission piece is arranged on a locking piece, a guide part is arranged in the compasses seat, when a user applies force to the locking piece, the clamping part slides on the guide part, the clamping part extrudes the transmission piece inwards by virtue of the guide part, and the clamping part clamps the transmission piece, so that the transmission piece cannot move, and the pair of feet of the compasses can be locked by only pressing or pulling the locking piece.

Description

Compasses with lockable distance between two feet

Technical Field

The utility model relates to the technical field of stationery, in particular to a pair of compasses with lockable feet.

Background

The conventional compass comprises two supporting legs, wherein the end part of one supporting leg is provided with a needle point for positioning the center of a circle, and the other supporting leg is provided with a lead core for drawing a circle or an arc. When the compass is used, two supporting legs of the compass need to be broken to a required distance, the distance is the radius of a circle, and because the two supporting legs are rotationally connected with the compass seat, the supporting legs are easily shifted due to the influence of finger touch or other factors in the drawing process, and the distance between the two supporting legs is changed, so that drawing failure is caused.

Aiming at the problems, the publication number is: CN214873879U, the utility model discloses a compass, the compass comprises: positioning the cover; the compass body is of a hollow structure, one end of the compass body is a cylinder with a through hole, and the other end of the compass body is provided with a mounting hole; the locking knob is a cylinder with a through hole, one end of the locking knob is matched with the compass, and the other end of the locking knob is matched with the positioning cover; the center locking rack is provided with a first end and a second end, the first end penetrates through the through hole of the locking knob to be matched with the positioning cover, and the second end is positioned in the compass body; the two legs are provided with a gear structure at one end, and one end of the two legs with the gear structure is matched with the second end of the central locking rack; a locking bolt; and (5) locking the nut. According to the technical scheme, the locking knob is rotated to enable the positioning rib of the locking knob to be matched with the clamping groove in the compass body, wherein one clamping groove of the compass body is matched with the positioning rib of the locking knob in a double-foot free opening state, and at the moment, the clamping point in the locking knob is in clearance fit with the flat position of the central locking rack; the other clamping groove of the compass body is matched with the positioning rib in a double-foot distance locking state, and the locking force in the double-foot distance locking state is obtained by interference fit between the clamping position inside the locking knob and the column position of the central locking rack. According to the compass provided by the technical scheme, interference fit is carried out on the column position of the central locking rack through rotating the locking knob to the clamping position, so that the distance between two feet of the compass is locked, but the clamping position of the locking knob is easy to miss the column position of the locking rack due to overlarge rotation in the rotating process, the locking knob needs to be rotated for many times and with tolerance, the rotating locking mode is difficult to control, the time consumption is large, and inconvenience still exists in actual use.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the compass with lockable double-foot distance, which uses the deformation of the clamping part caused by sliding along the guide part to clamp or unclamp the transmission rod, and a user can lock the double-foot distance of the compass by only pressing the locking piece, so that the compass is convenient to use and saves labor.

The utility model provides a pair of compasses with lockable feet distance, which comprises a compass seat, a first supporting leg and a second supporting leg, wherein the first supporting leg and the second supporting leg are both in rotary connection with the compass seat, a transmission part and a locking part are arranged in the compass seat, the transmission part is respectively connected with the first supporting leg and the second supporting leg, the transmission part drives the first supporting leg and the second supporting leg to synchronously rotate through moving, the locking part comprises a clamping part sleeved with the transmission part, the compass seat is provided with a guide part in sliding fit with the clamping part, and the clamping part slides back and forth along the guide part to clamp or release the transmission part.

In the technical scheme, the first support leg and the second support leg are adjusted to be away from each other through rotation, so that the radius of a circle to be drawn is controlled, a transmission piece is arranged between the first support leg and the second support leg, the transmission piece slides up and down in the compass seat to drive the first support leg and the second support leg to rotate synchronously, namely, when a user adjusts the first support leg, the second support leg also rotates for the same angle, the distance between the two support legs is adjusted more labor-saving, when the first support leg or the second support leg rotates, the transmission piece slides up and down in the compass seat, the first support leg, the second support leg and the transmission piece are in linkage relation, when any one of the first support leg, the second support leg and the transmission piece moves, the three pieces move synchronously, and when any one of the first support leg, the second support leg and the transmission piece is locked, the three pieces cannot move;

the clamping part is arranged at the bottom of the locking part, the compass seat is provided with a guide part matched with the clamping part, a user slides the locking part through the sliding of the locking part, the guide part has inward extrusion acting force on the clamping part, the clamping part is contracted inwards, the clamping part is sheathed with one end of the transmission part, the transmission part can be clamped by the inward contraction of the clamping part, the transmission part cannot move, and the first support leg and the second support leg cannot rotate due to the limitation of the transmission part, so that the aim of locking the distance between two legs of the compass is fulfilled; when the user needs to adjust the distance between the two feet of the compass again, the locking piece only needs to slide reversely, so that the clamping part slides reversely on the guiding part, the extrusion acting force of the guiding part on the clamping part is gradually reduced, the clamping part can loosen the transmission piece, the transmission piece is unlocked, the first support leg and the second support leg can rotate synchronously, the user can lock the distance between the two feet of the compass only by sliding the locking piece, and the compass has a simple structure and is labor-saving to use.

As an improvement, the guide part comprises two inwardly inclined side walls, and the cross section of the guide part is trapezoidal.

In this technical scheme, through setting up the lateral wall of two inward inclinations of guiding part for the gliding in-process of clamping part on the lateral wall, the clamping part can receive two lateral walls to its inwards thrust, and this thrust makes the clamping part inwards shrink to realize pressing from both sides tightly, and when the clamping part slides on the lateral wall along opposite direction, two lateral walls reduce gradually the inwards thrust of clamping part, and the clamping part can realize loosening, and lateral wall simple structure, cost are lower, convenient to use.

As an improvement, the clamping part is provided with at least two elastic clamping arms, and the elastic clamping arms are provided with protrusions in sliding fit with the guide part.

In this technical scheme, through setting up the elastic clamping arm on the clamping part, the elastic clamping arm slides on the lateral wall of guiding part through the arch, the arch receives the lateral wall to its inwards thrust to make the elastic clamping arm take place deformation and inwards shrink, when the arch slides along opposite direction on the lateral wall of guiding part, the lateral wall that the arch received reduces to its inwards thrust gradually, the elastic clamping arm outwards loosens the reset through the elastic force effect, the steam generator is simple in structure, the cost is lower, use laborsaving.

As an improvement, the transmission piece comprises a connecting rod part and a rack part, the connecting rod part is sleeved with the clamping part, one side of the rack part is meshed with the first supporting leg, and the other side of the rack part is meshed with the second supporting leg.

In this technical scheme, the driving medium cup joints through connecting rod portion and clamping part, and the clamping part locks the driving medium through pressing from both sides tight connecting rod portion, and the driving medium passes through rack portion and first stabilizer blade, second stabilizer blade meshing, and three linkage is realized through rack portion to driving medium, first stabilizer blade and second stabilizer blade, and when connecting rod portion was pressed from both sides tightly, the driving medium can't remove, then first stabilizer blade and second stabilizer blade also can not remove, realizes the transmission through the rack meshing, simple structure, transmission efficiency is high.

As an improvement, the first leg is connected with a first gear, the first leg is engaged with one side of the rack portion through the first gear, the second leg is connected with a second gear, and the second leg is engaged with the other side of the rack portion through the second gear. In this technical scheme, first stabilizer blade and driving medium realize the meshing through first gear, and the second stabilizer blade realizes the meshing through the second gear with the driving medium, improves transmission efficiency, cooperation more reliably.

As an improvement, the first support leg is fixedly connected with the first gear, and the second support leg is fixedly connected with the second gear. In the technical scheme, the fixing connection is adopted to improve the matching reliability between parts, and the installation is more convenient.

As an improvement, the top of the first support leg is provided with a first rotating tooth, the top of the second support leg is provided with a second rotating tooth matched with the first rotating tooth, and the first rotating tooth is meshed with the second rotating tooth. In this technical scheme, through first commentaries on classics tooth and second commentaries on classics tooth meshing realization connection between first stabilizer blade and the second stabilizer blade, improve the transmission efficiency of first stabilizer blade and second stabilizer blade, the user uses laborsaving convenient more.

As an improvement, the compass seat is provided with a sleeve part matched with the locking piece, and the locking piece is spliced with the sleeve part. In this technical scheme, set up locking piece and compasses seat and realize pegging graft through sleeve pipe portion, the mounting means of pegging graft is simple, laborsaving to the locking piece can be in sleeve pipe portion along axial slip through the pegging graft, and the user only need press or draw the distance locking between the compasses bipedal.

As an improvement, one end of the locking piece far away from the transmission piece is provided with a pressing part, the pressing part is positioned outside the sleeve part, and the bottom diameter of the pressing part is larger than the top diameter of the sleeve part. In this technical scheme, through setting up the pressing part on the locking piece, the user can make the locking piece slide in sleeve pipe portion through exerting the power in the pressing part, and the pressing part is located in the sleeve pipe portion outside so that the user's operation, through setting up the top diameter of pressing part and being greater than the top diameter of sleeve pipe portion, realizes the slip spacing of pressing part, prevents to make pressing part get into in the sleeve pipe portion because of exerting the excessive force to make the user be difficult to take out, improve the convenience of use.

As an improvement, the top diameter of the pressing portion is larger than the bottom diameter of the pressing portion. In this technical scheme, the user drives the locking piece through pressing or drawing the pressing part and slides, through setting up the top diameter of pressing part and the bottom diameter of pressing part different for the user has the application of force position when drawing the pressing part, draws the pressing part more laborsaving convenience.

According to the compass with lockable double-foot distance, the transmission piece is arranged between the first support leg and the second support leg, so that the first support leg, the second support leg and the transmission piece are linked, the clamping part sleeved with the transmission piece is arranged on the locking piece, the guide part is arranged in the compass seat, when a user applies force to the locking piece, the clamping part slides on the guide part, the clamping part clamps the transmission piece through inward extrusion acting force of the guide part on the clamping part, and the transmission piece cannot be moved, so that the first support leg and the second support leg cannot rotate, and the double-foot distance of the compass can be locked only by pressing or pulling the locking piece by the user, so that the compass is simple in structure and labor-saving to use.

Drawings

Fig. 1 is a schematic perspective view of a pair of compasses with lockable feet.

Fig. 2 is a schematic sectional view of a pair of compasses with lockable feet distance.

Fig. 3 is an enlarged partial schematic view of fig. 2 a of the present disclosure.

Fig. 4 is a schematic perspective view of a locking member of the present disclosure.

Fig. 5 is a schematic view of a portion of the structure of the compass seat in the present disclosure.

Fig. 6 is a schematic view of a part of the structure of the compass of the present disclosure in an unlocked state.

The figure shows: 1. a compass seat; 11. a guide part; 111. a sidewall; 12. a sleeve portion; 2. a first leg; 21. a first rotating tooth; 3. a second leg; 31. a second rotating tooth; 4. a transmission member; 41. a link portion; 42. a rack portion; 5. a locking member; 51. a clamping part; 511. an elastic clamping arm; 52. a pressing part; 6. a first gear; 7. and a second gear.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification.

In the drawings, the thickness, size and shape of the object have been slightly exaggerated for convenience of explanation. The figures are merely examples and are not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "including" and/or "having," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

As shown in fig. 1 to 6, the present application discloses a pair of compasses with lockable feet distance, comprising a compass seat 1, a first support leg 2 and a second support leg 3, wherein the first support leg 2 and the second support leg 3 are both rotatably connected with the compass seat 1, and the first support leg 2 and the second support leg 3 adjust the distance between each other through rotation, so as to control the radius of a circle to be drawn; the transmission piece 4 and the locking piece 5 are installed in the compass seat 1, the transmission piece 4 is connected with the first supporting leg 2 and the second supporting leg 3 respectively, the first supporting leg 2 and the second supporting leg 3 realize synchronous rotation through the transmission piece 4, namely when a user adjusts the first supporting leg 2, the second supporting leg 3 can rotate the same angle, the distance between the two supporting legs is adjusted more laborsaving, when the first supporting leg 2 or the second supporting leg 3 rotates, the transmission piece 4 slides up and down in the compass seat 1, the first supporting leg 2, the second supporting leg 3 and the transmission piece 4 are in linkage relation, when any one of the first supporting leg 2, the second supporting leg 3 and the transmission piece 4 moves, all the three move synchronously, and when any one of the first supporting leg 2, the second supporting leg 3 and the transmission piece 4 is locked, all the three cannot move.

As shown in fig. 3 to 5, the locking piece 5 comprises a clamping part 51 sleeved with the transmission piece 4, the clamping part 51 is positioned at the bottom of the locking piece 5, the compass seat 1 is provided with a guide part 11 in sliding fit with the clamping part 51, the locking piece 5 enables the clamping part 51 to slide along the guide part 11 to clamp or unclamp the transmission piece 4, a user slides the clamping part 51 on the guide part 11 by sliding the locking piece 5, the guide part 11 has inward extrusion acting force on the clamping part 51 to enable the clamping part 51 to shrink inwards, the clamping part 51 is sleeved with one end of the transmission piece 4, the clamping part 51 shrinks inwards to clamp the transmission piece 4, and the transmission piece 4 cannot be moved, and then the first support leg 2 and the second support leg 3 are limited by the transmission piece 4 and cannot rotate, so that the purpose of locking the distance between two legs of the compass is achieved; when the user needs to adjust the distance between the two feet of the compass again, the locking piece 5 is only required to slide reversely, so that the clamping part 51 slides reversely on the guiding part 11, the extrusion acting force of the guiding part 11 to the clamping part 51 is gradually reduced, the clamping part 51 can release the transmission piece 4, the transmission piece 4 is unlocked, the first support leg 2 and the second support leg 3 can rotate synchronously, the user can lock the distance between the two feet of the compass only by sliding the locking piece 5, and the compass has a simple structure and is labor-saving to use.

As shown in fig. 5, the guiding portion 11 includes two inwardly inclined side walls 111, during the sliding process of the clamping portion 51 on the side walls 111, the clamping portion 51 receives the inward pushing force of the two side walls 111, and the pushing force makes the clamping portion 51 retract inwards to achieve clamping, and when the clamping portion 51 slides on the side walls 111 in opposite directions, the inward pushing force of the two side walls 111 on the clamping portion 51 is gradually reduced, the clamping portion 51 can achieve loosening, and the side walls 111 are simple in structure, low in cost and convenient to use.

As shown in fig. 4, the clamping portion 51 is provided with two elastic clamping arms 511, each elastic clamping arm 511 is provided with a protrusion slidingly engaged with the guide portion 11, the elastic clamping arms 511 slide on the side wall 111 of the guide portion 11 through the protrusions, the protrusions receive inward thrust of the side wall 111 to the elastic clamping arms 511, so that the elastic clamping arms 511 deform and shrink inwards, when the protrusions slide on the side wall 111 of the guide portion 11 in opposite directions, the inward thrust of the side wall 111 received by the protrusions is gradually reduced, and the elastic clamping arms 511 release and reset outwards through the action of elastic force, so that the structure is simple, the cost is low, and the use is labor-saving.

More specifically, the guide portion 11 in this embodiment is formed by two protrusions, which are inclined inward, and this embodiment can provide two ways of realizing the locking of the distance between two feet by inclining inward:

firstly, two lugs incline downwards and inwards, namely the top size of the guide part 11 is larger than the bottom size of the guide part 11, at the moment, the section of the guide part 11 is in an inverted trapezoid shape, the bulges on the elastic clamping arms 511 are also provided with inclined planes with the same inclination angle as the lugs, when the bulges slide along the side walls 111, the inclined planes are attached to the side walls 111, the clamping parts 51 slide downwards, the extrusion acting force of the side walls 111 on the clamping parts is larger, the clamping parts 51 slide upwards, the extrusion acting force of the side walls 111 on the clamping parts is smaller, as shown in fig. 1 and 2, a user can enable the clamping parts 51 to slide downwards along the guide part 11 by pressing the locking parts 5, so as to clamp the transmission parts 4, as shown in fig. 6, the user can enable the clamping parts 51 to slide upwards along the guide parts 11 by pulling the locking parts 5, so as to release the transmission parts 4, and the distance unlocking of the two legs of the compass is realized;

secondly, two lugs incline upwards and inwards, namely the size at the top of the guide part 11 is smaller than the size at the bottom of the guide part 11, at the moment, the section of the guide part 11 is in a regular trapezoid, the bulges on the elastic clamping arms 511 are also provided with inclined planes with the same inclination angle as the lugs, when the bulges slide along the side walls 111, the inclined planes are attached to the side walls 111, the clamping parts 51 slide upwards, the extrusion acting force of the side walls 111 on the clamping parts 51 is larger, the clamping parts 51 slide downwards, the extrusion acting force of the side walls 111 on the side walls is smaller, a user can enable the clamping parts 51 to slide upwards along the guide part 11 by drawing the locking piece 5, so that the transmission piece 4 is clamped, the distance locking of the two legs of the compass is realized, and the user can enable the clamping parts 51 to slide downwards along the guide part 11 by pressing the locking piece 5, so that the transmission piece 4 is loosened, and the distance unlocking of the two legs of the compass is realized.

As shown in fig. 3 and 6, the transmission member 4 includes a connecting rod portion 41 and a rack portion 42, the connecting rod portion 41 is sleeved with the clamping portion 51, the clamping portion 51 locks the transmission member 4 by clamping the connecting rod portion 41, one side of the rack portion 42 is meshed with the first support leg 2, the other side of the rack portion 42 is meshed with the second support leg 3, the transmission member 4, the first support leg 2 and the second support leg 3 are linked through the rack portion 42, when the connecting rod portion 41 is clamped, the transmission member 4 cannot move, the first support leg 2 and the second support leg 3 cannot move, and transmission is achieved through rack meshing, so that the structure is simple, and the transmission efficiency is high.

As shown in fig. 3, the first support leg 2 is connected with the first gear 6, the first support leg 2 is meshed with one side of the rack part 42 through the first gear 6, the second support leg 3 is connected with the second gear 7, the second support leg 3 is meshed with the other side of the rack part 42 through the second gear 7, the first support leg 2 is meshed with the transmission member 4 through the first gear 6, the second support leg 3 is meshed with the transmission member 4 through the second gear 7, the transmission efficiency is improved, the matching is more reliable, the first support leg 2 is fixedly connected with the first gear 6, the second support leg 3 is fixedly connected with the second gear 7, the fixed connection mode includes but is not limited to welding and bonding, the first support leg 2 and the first gear 6 are fixed on the compass seat 1 through bolts, the second support leg 3 and the second gear 7 are fixed on the installation seat through bolts, and the installation is more convenient; the top of first stabilizer blade 2 is provided with first tooth of turning 21, and the top of second stabilizer blade 3 is provided with the second tooth of turning 31 with first tooth of turning 21 adaptation, and first tooth of turning 21 meshes with second tooth of turning 31, improves the transmission efficiency of first stabilizer blade 2 and second stabilizer blade 3, and the user uses more laborsaving convenient.

As shown in fig. 3 and 5, the compass seat 1 is provided with a sleeve portion 12 adapted to the locking piece 5, the locking piece 5 is inserted into the sleeve portion 12, the locking piece 5 and the compass seat 1 are inserted into each other through the sleeve portion 12, the inserted mounting mode is simple and labor-saving, the locking piece 5 can slide in the sleeve portion 12 along the axial direction through the insertion, and a user can lock the distance between two legs of the compass only by pressing or pulling the locking piece 5, so that the compass seat is labor-saving to use. More specifically, the present embodiment may further provide the steps of installing the compass: the locking piece 5 is inserted into the sleeve part 12, the connecting rod part 41 of the transmission piece 4 is inserted into the clamping part 51 of the locking piece 5, the first support leg 2 and the first gear 6 are installed on one side of the rack part 42, the second support leg 3 and the second gear 7 are installed on the other side of the rack part 42, and finally the first support leg 2 and the first gear 6, the second support leg 3 and the second gear 7 are respectively fixed in the compass seat 1 through bolts.

As shown in fig. 3 and 4, a pressing part 52 is arranged at one end of the locking piece 5 far away from the transmission piece 4, the pressing part 52 is positioned at the outer side of the sleeve part 12, the bottom diameter of the pressing part 52 is larger than the top diameter of the sleeve part 12, a user can slide the locking piece 5 in the sleeve part 12 by applying force to the pressing part 52, the pressing part 52 is positioned at the outer side of the sleeve part 12 so as to be convenient for the user to operate, the sliding limit of the pressing part 52 is realized by arranging that the top diameter of the pressing part 52 is larger than the top diameter of the sleeve part 12, and the pressing part 52 is prevented from entering the sleeve part 12 due to overlarge force, so that the locking piece is difficult to be taken out by the user, and the use convenience is improved; the top diameter of the pressing part 52 is larger than the bottom diameter of the pressing part 52, a user drives the locking piece 5 to slide by pressing or pulling the pressing part 52, and the top diameter of the pressing part 52 is different from the bottom diameter of the pressing part 52, so that the user has a force application position when pulling the pressing part 52, and the pulling of the pressing part 52 is more labor-saving and convenient.

According to the compass with lockable double-foot distance, the transmission piece 4 is arranged between the first support leg 2 and the second support leg 3, so that the first support leg 2, the second support leg 3 and the transmission piece 4 are linked, the clamping part 51 sleeved with the transmission piece 4 is arranged on the locking piece 5, the guide part 11 is arranged in the compass seat 1, when a user applies force to the locking piece 5, the clamping part 51 slides on the guide part 11, the clamping part 51 clamps the transmission piece 4 through inward extrusion acting force of the guide part 11 on the clamping part 51, the transmission piece 4 cannot move, and therefore the first support leg 2 and the second support leg 3 cannot rotate, and the user can lock the double-foot distance of the compass only by pressing or pulling the locking piece 5.

The present utility model is not limited to the above-described preferred embodiments, and any person who can obtain other various products under the teaching of the present utility model, however, any change in shape or structure of the product is within the scope of the present utility model, and all the products having the same or similar technical solutions as the present application are included.

Claims

1. The utility model provides a compasses that bipedal distance can be locked, includes compasses seat (1), first stabilizer blade (2) and second stabilizer blade (3) all rotate with compasses seat (1) and are connected, a serial communication port, install driving medium (4) and locking piece (5) in compasses seat (1), driving medium (4) are connected with first stabilizer blade (2), second stabilizer blade (3) respectively, and driving medium (4) drive first stabilizer blade (2) and second stabilizer blade (3) synchronous rotation through removing, locking piece (5) include clamping part (51) that cup joints with driving medium (4), compasses seat (1) are provided with clamping part (51) sliding fit's guide (11), clamping part (51) are followed guide (11) and are slided back and forth and are pressed from both sides tight or loosen driving medium (4).

2. A pair of feet distance lockable compasses according to claim 1, characterized in that the guide (11) comprises two inwardly sloping side walls (111), the guide (11) being trapezoidal in cross section.

3. A pair of feet distance lockable compasses according to claim 1 or 2, characterized in that the clamping part (51) is provided with at least two elastic clamping arms (511), the elastic clamping arms (511) being provided with protrusions for sliding engagement with the guide part (11).

4. The pair of compasses with lockable foot distance according to claim 1, characterized in that the transmission member (4) comprises a connecting rod part (41) and a rack part (42), the connecting rod part (41) is sleeved with the clamping part (51), one side of the rack part (42) is meshed with the first support leg (2), and the other side of the rack part (42) is meshed with the second support leg (3).

5. The pair of feet distance lockable compasses according to claim 4, characterized in that the first leg (2) is connected with a first gear (6), the first leg (2) is meshed with one side of the rack part (42) through the first gear (6), the second leg (3) is connected with a second gear (7), and the second leg (3) is meshed with the other side of the rack part (42) through the second gear (7).

6. The compasses with lockable foot distance according to claim 5, characterized in that the first foot (2) is fixedly connected with the first gear (6) and the second foot (3) is fixedly connected with the second gear (7).

7. The pair of feet distance lockable compasses according to claim 6, characterized in that the top of the first leg (2) is provided with a first turning tooth (21), the top of the second leg (3) is provided with a second turning tooth (31) adapted to the first turning tooth (21), the first turning tooth (21) being engaged with the second turning tooth (31).

8. Compasses with lockable foot distance according to claim 1, characterized in that the compass holder (1) is provided with a sleeve part (12) adapted to the locking element (5), the locking element (5) being plugged into the sleeve part (12).

9. The compasses with lockable feet distance according to claim 8, characterized in that the end of the locking piece (5) far away from the transmission piece (4) is provided with a pressing part (52), the pressing part (52) is positioned outside the sleeve part (12), and the bottom diameter of the pressing part (52) is larger than the top diameter of the sleeve part (12).

10. The pair of feet distance lockable compasses according to claim 9, characterized in that the top diameter of the pressing part (52) is larger than the bottom diameter of the pressing part (52).