Auxiliary support for compass calibration map

Abstract

The utility model discloses an auxiliary support for a compass calibration map, which belongs to the technical field of compass calibration map auxiliary devices and comprises a stable support and a supporting platform arranged on the stable support, the supporting platform comprises a mounting disc, a plurality of mounting ports are formed in the circumferential direction of the mounting disc, and a plurality of supporting strips are rotatably clamped in the mounting ports. The supporting strips are connected through canvas faces. The mounting disc is vertically provided with a pressing part and a bearing part, the periphery of the pressing part is sleeved with a first telescopic spring, one end of the first telescopic spring abuts against the bearing part, and the other end abuts against the supporting strip; the pressing part comprises a column body, and the column body is provided with a button in the horizontal direction; the cylinder is sleeved with the cylinder, and a notch matched with the button is formed in the side wall of the cylinder. According to the auxiliary bracket for calibrating the map by the compass, the supporting strip can be expanded by pressing the column body and utilizing the first telescopic spring, and the supporting strip and the notch are fixed through the button, so that the stable setting of the supporting surface is realized, the map is convenient to place and calibrate, the portability is high, and the operation is easy.

Description

Technical Field

[0001] This utility model belongs to the technical field of compass calibration map auxiliary devices, specifically relating to an auxiliary support for compass calibration maps. Background Technology

[0002] A compass is a tool that uses the Earth's magnetic field to indicate direction. The magnetic needle of a compass will point to the magnetic north pole under the influence of the Earth's magnetic field. Maps are usually drawn according to the orientation rules of north at the top, south at the bottom, west on the left, and east on the right. By aligning the compass with the north direction on the map, the map can be matched with the actual geographical location, thus completing the map calibration.

[0003] In real-world scenarios such as wilderness exploration and road trips, compass calibration map supports can be used to hold and display maps, allowing users to easily and accurately calibrate them. This helps users better grasp direction and location information, quickly determining orientation and planning the optimal route when facing vast natural environments. Typically, when using a compass for map calibration, the compass is separated from the map and observed by holding it. If the compass is not kept level, or if pressure from fingers causes it to shift, the accuracy of the results may be affected, leading to incorrect directional readings. Utility Model Content

[0004] In view of one or more of the above-mentioned defects or improvement needs of the existing technology, this utility model provides an auxiliary support for compass calibration maps to solve the problem of azimuth indication errors caused by the inconsistency in the levelness of existing compasses and calibration maps.

[0005] To achieve the above objectives, this utility model provides an auxiliary support for compass map calibration, comprising:

[0006] A stabilizing bracket for supporting the ground;

[0007] A support platform is mounted on the stable bracket. The support platform includes a mounting disc and multiple support bars arranged around the circumference of the mounting disc. The multiple support bars are connected by a canvas surface, and the multiple support bars and the canvas surface form a placement plane for the calibration map. The mounting disc has multiple mounting openings in the circumference, and the multiple support bars are vertically rotated and locked into each of the mounting openings.

[0008] The mounting disc extends vertically and is provided with a positioning component. The positioning component includes a pressing part connected to the mounting disc and a receiving part connected to the stabilizing bracket. A first telescopic spring is sleeved on the outer periphery of the pressing part. One end of the first telescopic spring abuts against the receiving part, and the other end abuts against each of the support bars.

[0009] The pressing part comprises a column arranged vertically, a level gauge embedded on the column, and a button arranged on the column in a horizontal direction, and a second elastic spring connected between the button and the column.

[0010] The receiving part comprises a cylinder, the column is sleeved in the cylinder, and a notch matching the button is arranged on the side wall of the cylinder.

[0011] As a further improvement of the utility model, first and second notches are arranged on the side wall of the cylinder in a vertical direction;

[0012] When the button matches the first notch, the support strips are in a condensed state.

[0013] When the button matches the second notch, the support strips are unfolded and in a planar state.

[0014] As a further improvement of the utility model, the outer wall of the column is slidably matched with the inner wall of the cylinder.

[0015] An installation notch is arranged on the side wall of the column, and the button is connected with the inner wall of the installation notch through the second elastic spring.

[0016] As a further improvement of the utility model, the button is a wedge block, and the upper end of the button is arranged in an extending manner away from the side wall of the installation notch.

[0017] As a further improvement of the utility model, a horizontal adjustment mechanism is further arranged between the cylinder and the stabilizing support.

[0018] The horizontal adjustment mechanism comprises a rotating part rotatably connected with the cylinder, the cylinder vertically extends two connecting parts, and the two connecting parts are threadedly connected with the rotating part.

[0019] A rotating ball is arranged on the lower end of the cylinder, and an abutting column is arranged in the rotating part in a vertical direction.

[0020] As a further improvement of the utility model, a horizontal rotating mechanism is further arranged below the rotating part.

[0021] The horizontal rotating mechanism comprises a housing integrally arranged with the rotating part, a rotating gear is arranged in the housing, the housing and the rotating gear are arranged separately, and the rotating gear is connected with the stabilizing support.

[0022] Limiting sheets are arranged on both sides of the housing, the limiting sheets are connected with the inner wall of the housing through third elastic springs, and the limiting sheets abut against the tooth surface of the rotating gear when the third elastic springs are in an extended state.

[0023] A buckle is further arranged between the two limiting sheets, the buckle is arranged in rotation, the buckle extends to a limiting protrusion at two ends, and a pushing end of the buckle extends out of the shell.

[0024] As a further improvement of the present application, the supporting rod comprises a rod body, a pin hole is arranged at one end of the rod body, a locking cap is arranged at the other end of the rod body, and the locking cap is threadedly connected with the rod body.

[0025] As a further improvement of the present application, a lamp strip is further arranged on the rod body.

[0026] As a further improvement of the present application, a hole is arranged in the middle of the mounting disc, and the column body is arranged in the hole of the mounting disc.

[0027] As a further improvement of the present application, a handle is further arranged on the outer periphery of the cylinder.

[0028] The above technical features can be combined with each other as long as they do not conflict with each other.

[0029] Compared with the prior art, the above technical scheme of the present application has the following beneficial effects:

[0030] (1) The north-seeking compass map calibration auxiliary support of the present application is matched with the supporting rod through the mounting disc, the first telescopic spring is compressed and telescoped to abut against the supporting rod, when the mounting disc drives the column body to move downward, the first telescopic spring abuts against the receiving part, the other end of the first telescopic spring is compressed and exerts force on the supporting rod, the supporting rod is rotated and unfolded, then the canvas surface is stretched to a plane, so that the calibration map can be placed; at the same time, the level is arranged on the column body, the level is directly embedded on the auxiliary support, and the leveling work of the map can be completed; at the same time, when the first telescopic spring is compressed and the canvas surface is unfolded, the button moves downward and is clamped into the notch through the second telescopic spring, so that the column body is clamped at the set position, the canvas surface is stably unfolded, and personnel can conveniently observe the map. The north-seeking compass map calibration auxiliary support of the present application can unfold and place the calibration map when in use, and can be directly bunched up when not in use, so that good portability is achieved; the level is directly embedded on the auxiliary support, so that the level and the calibration map are at the same level, when the level is at the horizontal position, it represents that the calibration map is also at the horizontal state, and the accuracy of the direction indication of the calibration map is ensured.

[0031] (2) The north-seeking compass map calibration auxiliary support of the present application is provided with the first notch and the second notch on the side wall of the cylinder, the button is arranged in a wedge-shaped structure which is narrow at the bottom and wide at the top, so that the button can be accurately clamped at the first notch and the second notch, the supporting plane is stably arranged in the unfolded state and the bunched-up state, the integrated arrangement of the pressing part and the receiving part is ensured, and the use and bunching-up of the auxiliary support are facilitated.

[0032] (3) The north pointer calibration map auxiliary support of the utility model, through setting rotating part in lower part of cylinder, setting rotating ball in lower end of cylinder and setting abutting column in rotating part, when connecting part on cylinder rotates, distance between cylinder and rotating part can be adjusted correspondingly, when rotating ball abuts with abutting column, cylinder and rotating part are locked relatively, calibration map can be placed stably on canvas surface; when gap is left between rotating ball and abutting column, rotating ball can swing relatively, level surface where canvas surface is can be adjusted and leveled correspondingly, so as to ensure accurate calibration of calibration map.

[0033] (4) The north pointer calibration map auxiliary support of the utility model, through setting rotating gear and setting limiting sheet on both sides of rotating gear, under normal condition, third telescopic spring expands and makes both limiting sheets be clamped on both sides of rotating gear, rotating gear is locked correspondingly, stable support and supporting platform are locked relatively, calibration map is placed stably on supporting platform; when plate buckle is pushed to both sides, plate buckle compresses one side limiting sheet, at this time, one side of rotating gear is not limited, supporting platform on upper part can be driven to rotate to one side, by adjusting direction of calibration map, user can observe calibration map and adjust direction. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is the whole structure schematic diagram of the north pointer calibration map auxiliary support in the utility model embodiment;

[0035] Figure 2 It is the explosion structure schematic diagram of the north pointer calibration map auxiliary support in the utility model embodiment;

[0036] Figure 3 It is the structure schematic diagram of cylinder and cylinder in the utility model embodiment;

[0037] Figure 4 It is the structure schematic diagram of button in the utility model embodiment;

[0038] Figure 5 It is the structure schematic diagram of cylinder in the utility model embodiment;

[0039] Figure 6 It is the cross section structure schematic diagram of cylinder in the utility model embodiment;

[0040] Figure 7 It is the structure schematic diagram of rotating gear in the utility model embodiment;

[0041] Figure 8 It is the structure schematic diagram of plate buckle in the utility model embodiment;

[0042] Figure 9 It is the structure schematic diagram of supporting strip in the utility model embodiment.

[0043] In all the drawings, the same reference signs refer to the same technical features, in particular:

[0044] 1, stable support; 2, mounting disc; 3, support strip; 4, canvas surface; 5, first telescopic spring; 6, column body; 7, level; 8, button; 9, second telescopic spring; 10, cylinder body; 11, first notch; 12, second notch; 13, mounting notch; 14, rotating part; 15, connecting part; 16, rotating ball; 17, abutting column; 18, shell; 19, rotating gear; 20, limiting sheet; 21, third telescopic spring; 22, plate buckle; 23, limiting protrusion; 24, rod body; 25, locking cap; 26, lamp strip; 27, switch; 28, handle; 29, return spring. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as there is no conflict.

[0046] In the description of the utility model, it should be understood that, unless otherwise specified, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0047] In addition, unless otherwise specified, the terms "first", "second" are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0048] In the utility model, unless another definite provision and limitation, the terms "mount", "connect", "fix", and the like terms should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element internal communication or two element mutual action relation, unless another definite limitation.For the ordinary skilled person in the art, the above terms can be understood according to the specific meaning in the utility model.

[0049] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can be the first and second features directly contact, or the first and second features indirectly contact through the intermediate medium.And, the first feature is "on", "above" and "on" the second feature can be the first feature is directly above or obliquely above the second feature, or just indicates that the first feature is higher than the second feature in horizontal height.The first feature is "under", "below" and "under" the second feature can be the first feature is directly below or obliquely below the second feature, or just indicates that the first feature is less than the second feature in horizontal height.

[0050] Embodiment:

[0051] Please refer to Figures 1-9 The north-seeking compass calibration map auxiliary support in the preferred embodiment of the utility model includes a stabilizing support 1 for supporting on the ground, and a support platform provided on the stabilizing support 1, which comprises a mounting disc 2 and a plurality of support bars 3 provided on the mounting disc 2, the plurality of support bars 3 are connected through a canvas surface 4, and the plurality of support bars 3 and the canvas surface 4 form a placement plane for the calibration map;A plurality of mounting openings are formed in the circumferential direction of the mounting disc 2, and the plurality of mounting openings are downwardly open, and the plurality of support bars 3 are rotatably clamped in the mounting openings in the vertical direction;Meanwhile, the mounting disc 2 is provided with a positioning assembly extending in the vertical direction, the positioning assembly comprises a pressing portion connected with the mounting disc 2 and a receiving portion connected with the stabilizing support 1, a first extension spring 5 is sleeved on the outer periphery of the pressing portion, one end of the first extension spring 5 abuts against the receiving portion, and the other end of the first extension spring 5 abuts against each support bar 3;The pressing portion comprises a column body 6 provided in the vertical direction, a level 7 is embedded on the column body 6, and the column body 6 is provided with a button 8 in the horizontal direction, and a second extension spring 9 is connected between the button 8 and the column body 6;The receiving portion comprises a cylinder body 10, the column body 6 is sleeved in the cylinder body 10, and a notch matched with the button 8 is formed in the side wall of the cylinder body 10.

[0052] The auxiliary support for compass calibration map in the application can expand and place the calibration map when in use, and can directly contract when not in use, so that good portability is achieved; and the level 7 is directly embedded on the auxiliary support, so that the level 7 and the calibration map are in the same level, and when the level 7 is in the horizontal position, the calibration map is also in the horizontal state, so that the accuracy of the direction indication of the calibration map is ensured.

[0053] As one of the embodiments of the utility model, the first notch 11 and the second notch 12 are arranged on the side wall of the cylinder 10 in the vertical direction; when the button 8 matches the first notch 11, each support strip 3 is in the contracted state, and when the button 8 matches the second notch 12, each support strip 3 is expanded into a planar shape. Since the cylinder 6 and the cylinder 10 are in the separated state, only one notch can expand the canvas 4 into a planar state to complete the limiting, and when the button 8 is separated from the notch, the cylinder 6 and the cylinder 10 are separated, which causes the separation of the stable support 1 and the support platform, and is not convenient for the use and carrying of the auxiliary support. Therefore, the first notch 11 and the second notch 12 are arranged on the side wall of the cylinder 10, the button 8 is clamped in the first notch 11 when the auxiliary support needs to be contracted, and the button 8 is clamped in the second notch 12 when the auxiliary support needs to be expanded for use.

[0054] As one of the embodiments of the utility model, the outer wall of the cylinder 6 is slidably matched with the inner wall of the cylinder 10, and the installation notch 13 is arranged on the side wall of the cylinder 6, and the button 8 is connected with the inner wall of the installation notch 13 through the second elastic spring 9. In order to ensure the stable adjustment between the stable support 1 and the support platform, the cylinder 6 and the cylinder 10 are slidably matched in the application. Correspondingly, the installation notch 13 is reserved on the cylinder 6, so as to install the second elastic spring 9 and the button 8. When the second elastic spring 9 and the button 8 are all accommodated in the installation notch 13, the cylinder 6 can be smoothly slid in the cylinder 10; when the button 8 is slid to the first notch 11 or the second notch 12, the button 8 is correspondingly popped out under the action of the second elastic spring 9, the button 8 is clamped in the notch, and the relative limiting of the cylinder 6 and the cylinder 10 is realized.

[0055] As one of the embodiments of the utility model, the button 8 in the application is a wedge, and the upper end of the button 8 extends away from the side wall of the mounting gap 13. When the button 8 in the application is clamped in the gap, the first telescopic spring 5 is in a compressed state, at this time, the first telescopic spring 5 has a tendency to stretch vertically, in order to make the first telescopic spring 5 continuously in a compressed state, the button 8 in the application is arranged as a wedge structure, the lateral surface of the wedge abuts against the wall surface of the gap, and the cylinder 6 and the barrel 10 remain in a relatively stable state. The wedge structure makes the cylinder 6 slide down, and the button 8 does not hinder the relative sliding of the cylinder 6. When it is necessary to release the locking, the button 8 is only pressed, and the button 8 is retracted into the barrel 10, facilitating the relative movement of the cylinder 6 and the barrel 10.

[0056] Optionally, the lower end of the cylinder 6 is further provided with a reset spring 29, the barrel 10 is a counterbore structure, and the reset spring 29 is compressed when the cylinder 6 is pressed down. When it is necessary to fold the supporting strip 3, the reset spring 29 can provide a retraction force, facilitating the folding and carrying of the auxiliary support.

[0057] As one of the embodiments of the utility model, the barrel 10 and the stabilizing support 1 in the application are further provided with a horizontal adjustment mechanism. The horizontal adjustment mechanism comprises a rotating part 14 connected with the barrel 10, the barrel 10 extends vertically and has two connecting parts 15, and the two connecting parts 15 are movably connected with the rotating part 14. Meanwhile, the lower end of the barrel 10 is provided with a rotating ball 16, and the rotating part 14 is screw matched with an abutting column 17 along the vertical direction. Specifically, the outer wall of the rotating part 14 is provided with two recessed areas corresponding to the two connecting parts 15, the recessed areas are elliptical, and the two connecting parts 15 can move in the recessed areas, so that the horizontal angle between the barrel 10 and the stabilizing support 1 can be adjusted, and the horizontal adjustment of the level 7 is realized. When the level 7 is adjusted to be horizontal, the knob abuts against the column 17, the column 17 ascends and descends vertically, the column 17 abuts tightly against the rotating ball 16, and the connecting part 15 abuts tightly against the upper wall of the recessed area, so that the barrel 10 and the stabilizing support 1 remain relatively fixed.

[0058] As one of the embodiments of the utility model, the rotating part 14 below in the application still is equipped with horizontal rotation mechanism, horizontal rotation mechanism includes the shell 18 that is integrally arranged with rotating part 14, the shell 18 inside is equipped with rotating gear 19, and the shell 18 is separated with rotating gear 19 arrangement, the rotating gear 19 is connected with stable support 1;While the shell 18 both sides are equipped with limit piece 20 respectively, two limit piece 20 are connected with shell 18 inner wall through third telescopic spring 21 respectively, and two limit piece 20 when third telescopic spring 21 stretches respectively abuts the tooth surface of rotating gear 19;While, still be equipped with plate buckle 22 between two limit piece 20, plate buckle 22 rotation setting, and plate buckle 22 extends limit protrusion 23 to both ends, the poking end of plate buckle 22 extends shell 18 outside.When needing to adjust the direction of calibration map, can be through to both sides poking plate buckle 22, plate buckle 22 correspondingly compresses the limit piece 20 of one side, rotating gear 19 side is no longer limited by limit piece 20, rotating gear 19 can normally rotate, and the support platform connected with shell 18 can rotate to one side to complete direction adjustment;When adjusting in place, plate buckle 22 returns to the middle, limit protrusion 23 no longer compresses limit piece 20, limit piece 20 is close to and abuts at the tooth surface of rotating gear 19 under the action of third telescopic spring 21, and rotating gear 19 is limited, and stable support 1 and support platform are relatively locked.

[0059] As one of the embodiments of the utility model, the support bar 3 in the application includes a rod body 24, one end of the rod body 24 towards the mounting disc 2 is provided with a pin hole, and the other end of the rod body 24 is provided with a locking cap 25. The locking cap 25 is threadedly connected with the rod body 24. The rod body 24 is rotationally connected with the mounting disc 2 through the pin hole, and the tightening mode of the locking cap 25 and the rod body 24 can lock the end of the canvas surface 4, thereby completing the setting of the canvas surface 4 on the support bar 3. Correspondingly, similar clamping structures are arranged at both ends of the rod body 24 to fix both ends of the canvas surface 4.

[0060] Optionally, the mounting port of the mounting disc 2 in the application is downwardly open, and the mounting port has a certain damping, so that the support bar 3 can be relatively fixed after being clamped into the mounting port, thereby ensuring the stability of the placement of the calibration map.

[0061] As one of the embodiments of the utility model, the rod body 24 in the application is further provided with a lamp strip 26, and a switch 27 is correspondingly arranged, the lamp strip 26 can be turned on through the switch 27, thereby facilitating the use of the auxiliary support in the evening or at night.

[0062] As one of the embodiments of the utility model, the outer periphery of the cylinder body 10 in the application is further provided with a handle 28, the handle 28 facilitates the carrying and handling of the auxiliary support.

[0063] Those skilled in the art can understand that the above description is only preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An auxiliary support for a compass surveying map, characterized by, include: A stabilizing bracket for supporting the ground; A support platform is mounted on the stable bracket. The support platform includes a mounting disc and multiple support bars arranged around the circumference of the mounting disc. The multiple support bars are connected by a canvas surface, and the multiple support bars and the canvas surface form a placement plane for the calibration map. The mounting disc has multiple mounting openings in the circumference, and the multiple mounting openings open downwards. The multiple support bars are vertically rotated and locked into each of the mounting openings. The mounting disc extends vertically and is provided with a positioning component. The positioning component includes a pressing part connected to the mounting disc and a receiving part connected to the stabilizing bracket. A first telescopic spring is sleeved on the outer periphery of the pressing part. One end of the first telescopic spring abuts against the receiving part, and the other end abuts against each of the support bars. The pressing part includes a vertically arranged column, a level is embedded in the column, and a button is provided on the column in the horizontal direction. A second telescopic spring connects the button and the column. The receiving part includes a cylindrical body, the column is sleeved inside the cylindrical body, and the side wall of the cylindrical body has a notch that matches the button.

2. The auxiliary support for the north finding map according to claim 1, wherein The side wall of the cylinder is provided with a first notch and a second notch at vertical intervals; When the button matches the first notch, each of the support bars is in a constricted state; When the button matches the second notch, each of the support bars unfolds into a planar shape.

3. The auxiliary support for a map of the compass card according to claim 1 or 2, characterized in that The outer wall of the column slides to match the inner wall of the cylinder; An installation notch is provided on the side wall of the column, and the button is connected to the inner wall of the installation notch via the second telescopic spring.

4. The auxiliary support for a map of the compass card according to claim 3, characterized in that The button is a wedge, and the upper end of the button extends away from the side wall of the mounting notch.

5. The auxiliary support for the compass calibrated map according to claim 1, characterized in that, A horizontal adjustment mechanism is also provided between the cylinder and the stabilizing support; The horizontal adjustment mechanism includes a rotating part connected to the cylinder body, and the cylinder body extends vertically with two connecting parts, which are movably connected to the rotating part. The lower end of the cylinder is provided with a rotating ball, and the rotating part is matched with an abutment post along the vertical thread.

6. The auxiliary support for a north seeking compass map according to claim 5, wherein, A horizontal rotation mechanism is also provided below the rotating part; The horizontal rotation mechanism includes a housing integrally formed with the rotating part, a rotating gear provided inside the housing, the housing and the rotating gear being separately disposed, and the rotating gear being connected to the stabilizing bracket; The housing is provided with limiting plates on both sides. The two limiting plates are connected to the inner wall of the housing by a third telescopic spring, and the two limiting plates abut against the tooth surface of the rotating gear when the third telescopic spring is extended. A buckle is also provided between the two limiting pieces. The buckle is rotatably configured and extends to both ends with limiting protrusions. The actuating end of the buckle extends out of the housing.

7. The auxiliary support for the north finding compass for map scaling according to claim 1, wherein, The support bar includes a rod body, with a pin hole at one end of the rod body facing the mounting disc, and a locking cap at the other end of the rod body, the locking cap being threadedly connected to the rod body.

8. The auxiliary support for a north arrow map according to claim 7, wherein The pole is also equipped with a light strip.

9. The auxiliary support for the north finding map according to claim 1, wherein, The mounting disc has a hole in the middle, and the column passes through the hole in the mounting disc.

10. The auxiliary support for a map of the compass rose according to claim 1, characterized in that, The cylinder is also equipped with a handle on its outer periphery.

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