CN210883649U

CN210883649U - Simple garbage classification vehicle

Info

Publication number: CN210883649U
Application number: CN201921566207.XU
Authority: CN
Inventors: 杨洁; 潘圆圆; 朱玉婷; 刘倩倩; 赵超颖; 张莉娟; 李娜; 闫雯雯
Original assignee: First Affiliated Hospital of Zhengzhou University
Current assignee: First Affiliated Hospital of Zhengzhou University
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-06-30
Anticipated expiration: 2029-09-19

Abstract

The simple garbage classification vehicle effectively solves the problems that garbage can not be classified and stored, the ampoule bottle occupies large space in the garbage storage process, medical waste piles up at the dustbin entrance more easily in the use, and the great polluted environment's of peculiar smell problem of rubbish, the on-line screen storage device comprises a base, be equipped with a rotatable disc on the base, it has four first connecting rods to articulate on the disc, four first connecting rod symmetries are arranged, the upper portion of every first connecting rod all is equipped with a box, first pin rod of every box lower part all fixedly connected with, every first pin rod all is articulated with first connecting rod with the below, every first connecting rod below all is equipped with a first guide rail, every first guide rail all fixed connection is in the bottom plate inner wall, the disc rotates and forms every box and to keeping away from the gliding structure of direction in the centre of a circle simultaneously, the utility model discloses novel structure thinks about ingeniously, makes things convenient for medical staff's use more.

Description

Simple garbage classification vehicle

Technical Field

The utility model belongs to the technical field of the medical instrument technique and specifically relates to a simple and easy car of waste classification is related to.

Background

With the implementation of medical waste policy, waste classification is an important part of daily work of hospitals, so various waste buckets become indispensable tools in treatment rooms, but the traditional classification waste bucket is large in size, difficult to move at a fixed position and single in function, but if medical staff dispenses medicines in the treatment rooms, the position far away from the waste bucket cannot directly classify the waste, great potential safety hazards exist, the labor force of the medical staff is increased, and the problems are combined to show that the fixed waste bucket obviously cannot meet the requirements of people.

SUMMERY OF THE UTILITY MODEL

To the above situation, for overcoming prior art's defect, the utility model provides a simple and easy car of waste classification through this design is effectual solved rubbish can not directly be categorised in the treatment room, is unfavorable for medical staff in time to handle rubbish in operation process, and the bigger than half function singleness of traditional sortable garbage bin volume makes things convenient for medical staff's use more.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model comprises a base, a rotatable disc is arranged on the base, four first connecting rods are evenly hinged on the disc, the upper part of each first connecting rod is provided with a box body, the lower part of each box body is fixedly connected with a first pin rod, each first pin rod is hinged with the first connecting rod below the first pin rod, a first guide rail is arranged below each first connecting rod, each first guide rail is fixedly connected with the inner wall of the base, and the disc rotates to form a structure that each box body slides towards the direction far away from the circle center of the disc;

the box includes domestic waste case, medical trash, sharp weapon dustbin and ampoule dustbin, be equipped with a push-and-pull mechanism in the medical trash, push-and-pull mechanism the place ahead articulates there are two arcs, two arcs symmetry are arranged, every arc all articulates in medical trash bottom, back shaft of disc center fixedly connected with, support frame of back shaft top fixedly connected with, the support frame top is equipped with one and can follows support frame pivoted apron, the terminal surface is equipped with an arc spout under the apron front portion, be equipped with a third pin rod that can slide in the arc spout, third pin rod lower extreme articulates in push-and-pull mechanism, the apron rotates and forms two arcs and uses both sides pin joint to be the centre of a circle simultaneously forward circumference pivoted structure.

Preferably, ampoule dustbin, including the second guide rail, be equipped with a gliding fourth pin rod around can in the second guide rail, second guide rail fixed connection is in the anterior inner wall of ampoule dustbin, fourth pin rod upper portion articulates there is a second connecting rod, the second connecting rod left end articulates there is a second pin rod, second pin rod fixed connection is terminal surface under the apron, fourth pin rod lower extreme articulates there is a fifth connecting rod, fifth connecting rod below articulates there is a stripper plate, the stripper plate every side all articulates there is a backup pad, two backup pads are all fixed connection in ampoule dustbin inner wall, a hang plate is established in stripper plate the place ahead, the rear end face fixed connection of hang plate is in the inner wall of ampoule dustbin, the apron rotates the structure that forms stripper plate extrusion ampoule rubbish.

Preferably, the push-pull mechanism comprises a third guide rail, a fourth pin rod capable of sliding back and forth on the third guide rail is arranged in the third guide rail, the third guide rail is fixedly connected to the inner wall of the rear portion of the medical garbage can, a third connecting rod is arranged above the fourth pin rod, a second coil spring is fixedly connected to the upper end of the fourth pin rod, the lower end face of the third connecting rod is fixedly connected to the upper end face of the second coil spring, the rear end of the third connecting rod is hinged to the third pin rod, two fourth connecting rods are hinged to the lower end of the fourth pin rod and are arranged in bilateral symmetry, and the two fourth connecting rods are hinged to the rear side faces of the two arc-shaped plates respectively.

Preferably, a fixed block is fixedly connected to the lower portion of the base, a transmission rod capable of rotating in the fixed block is arranged in the fixed block, a first bevel gear is fixedly connected to the right end of the transmission rod, a second bevel gear is meshed to the upper portion of the first bevel gear, the upper end face of the second bevel gear is fixedly connected to the disc, a coil spring is fixedly connected to the lower end face of the base, the lower end face of the coil spring is fixedly connected to the transmission rod, and a pedal is fixedly connected to the left end of.

Preferably, a filter screen is arranged in the household garbage can, a discharge pipe is arranged at the lower part of the filter screen and penetrates through the shell on the right side of the household garbage can, and a threaded cover is in threaded connection with the right end of the discharge pipe.

Preferably, the upper end face of the sharps garbage can is provided with a needle hole and a sharps hole.

Preferably, the handle is fixedly connected to the rear portion of the cover plate, the hinge is hinged to the front portion of the cover plate, and the lower end face of the hinge is fixedly connected to the supporting frame.

Preferably, the lower end face of the base is fixedly connected with four universal wheels, and the four universal wheels are symmetrically arranged.

The utility model discloses novel structure thinks about ingeniously, and easy operation is convenient, through this design effectually solved rubbish can not directly be categorised in the treatment room, be unfavorable for medical staff in time to handle rubbish in operation process, and the bigger than normal function singleness of traditional sortable garbage bin volume makes things convenient for medical staff's use more.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of the whole structure of the utility model in daily state.

Fig. 2 is a schematic view of the overall structure of the present invention.

Fig. 3 is a schematic view of the four garbage cans of the present invention.

Fig. 4 is a schematic view of the structure of the disc, the first connecting rod and the first guide rail according to the present invention.

Fig. 5 is a schematic view of the structure of the present invention showing the cooperation between the pedal and the disc.

Fig. 6 is a schematic view showing the cooperation of the pedal, the disc and the box body of the present invention.

Fig. 7 is a schematic sectional view of the ampoule garbage can of the present invention.

Fig. 8 is a schematic sectional view of the domestic garbage can of the present invention.

Detailed Description

The following describes the present invention in further detail with reference to fig. 1-8.

In the first embodiment, from fig. 1 and 2, fig. 4 and 5 show, in order to realize that four boxes can slide towards the direction far away from the center of a circle simultaneously, the garbage classification simple vehicle comprises a base 4, a rotatable disc 33 is arranged on the base 4, a supporting shaft 34 is fixedly connected to the center of the disc 33, a supporting frame 5 is fixedly connected to the upper portion of the supporting shaft 34, a cover plate 6 which can rotate along with the supporting frame 5 is arranged on the upper portion of the supporting frame 5, four first connecting rods 32 are hinged to the disc 33, the four first connecting rods 32 are symmetrically arranged, a box is arranged on the upper portion of each first connecting rod 32, a first pin 43 is fixedly connected to the lower portion of each box, each first pin 43 is hinged to the first connecting rod 32 with the lower portion, a first guide rail 31 is arranged below each first connecting rod 32, each first guide rail 31 is fixedly connected to the inner wall of the base 4, and the disc 33 rotates to form a structure that each box can slide towards the direction far away.

In the second embodiment, as shown in fig. 1, 4 and 6, in order to realize the rotation of the cover plate 6 and the opening and closing of the cover plate 6, a rotatable disc 33 is arranged on the base 4, a supporting shaft 34 is fixedly connected to the center of the disc 33, a supporting frame 5 is fixedly connected to the upper side of the supporting shaft 34, a cover plate 6 which can rotate along with the supporting frame 5 is arranged on the upper side of the supporting frame 5, a handle 10 is fixedly connected to the rear portion of the cover plate 6, a hinge 7 is hinged to the front portion of the cover plate 6, the lower end face of the hinge 7 is fixedly connected to the supporting frame 5, the rotation of the cover plate 6 while the rotation of the disc 33 can be realized, and the opening and closing of the cover plate 6 can be completed by lifting the handle 10 and using the hinge.

In the third embodiment, as shown in fig. 1, 4, 5 and 6, in order to realize the rotation resetting of the disc 33, a fixed block 36 is fixedly connected below the base 4, a transmission rod 3 capable of rotating in the fixed block 36 is arranged in the fixed block 36, a first bevel gear 37 is fixedly connected to the right end of the transmission rod 3, a second bevel gear 38 is engaged above the first bevel gear 37, the upper end surface of the second bevel gear 38 is fixedly connected to the disc 33, a coil spring is fixedly connected to the lower end surface of the base 4, the lower end surface of the coil spring is fixedly connected to the transmission rod 3, a pedal 2 is fixedly connected to the left end of the transmission rod 3, the clockwise rotation of the disc 33 can be realized by downwardly stepping on the pedal 2, and after the pedal 2 is stepped on, the clockwise rotation resetting of the disc 33 can be realized under the action.

In the fourth embodiment, as shown in fig. 1, 2, 3, 4 and 7, in order to crush the ampoule bottles in the ampoule trash can 11, the ampoule trash can 11 includes a second guide rail 26, a fourth pin 29 is disposed in the second guide rail 26 and can slide back and forth in the second guide rail 26, the second guide rail 26 is fixedly connected to the front inner wall of the ampoule trash can 11, the upper portion of the fourth pin 29 is hinged to a second connecting rod 3, the left end of the second connecting rod 3 is hinged to a second pin 39, the second pin 39 is fixedly connected to the lower end surface of the cover plate 6, the lower end of the fourth pin 29 is hinged to a fifth connecting rod 27, a pressing plate 23 is hinged below the fifth connecting rod 27, a supporting plate 24 is hinged to each side of the pressing plate 23, both supporting plates 24 are fixedly connected to the inner wall of the ampoule trash can 11, a tilting plate 4 is disposed in front of the pressing plate 23, the rear end surface of the tilting plate 4 is fixedly connected to the inner wall of the ampoule trash can 11, when apron 6 rotates, second round pin pole 39 drives fifth connecting rod 27 and slides forward along with apron 6 is anticlockwise circular motion, and then drive stripper plate 23 and use the bottom pin joint as the centre of a circle, the high radial circular motion that is of stripper plate 23, make stripper plate 23 slope backward, make things convenient for medical staff to throw into the ampoule, and a hang plate 40 is established in stripper plate 23 the place ahead, the rear end face fixed connection of hang plate 40 is in the inner wall of ampoule dustbin 11, when ampoule dustbin 11 resets, stripper plate 23 rotates backward and hang plate 40 cooperation forms the structure of extrusion ampoule rubbish, ampoule rubbish after the crushing falls into ampoule dustbin 11 along with hang plate 40.

In the fifth embodiment, as shown in fig. 1, 2, 3 and 8, in order to prevent the medical waste from being blocked at the front of the medical waste bin 15, a push-pull mechanism is arranged in the medical waste bin 15, two arc-shaped plates 16 are hinged at the front of the push-pull mechanism, the two arc-shaped plates 16 are symmetrically arranged, each arc-shaped plate 16 is hinged at the bottom of the medical waste bin 15, an arc-shaped chute 42 is arranged at the lower end face of the front part of the cover plate 6, a third pin 44 capable of sliding in the chute is arranged in the arc-shaped chute 42, the lower end of the third pin 44 is hinged at the push-pull mechanism, the push-pull mechanism comprises a third guide rail 25, a fifth pin 19 capable of sliding back and forth on the third guide rail 25 is arranged in the third guide rail 25, the third guide rail 25 is fixedly connected to the inner wall at the rear of the medical waste bin 15, a third connecting rod 20 is arranged above the fifth, the lower end face of a third connecting rod 20 is fixedly connected to the upper end face of the second coil spring, the rear end of the third connecting rod 20 is hinged to a third pin rod 44, the lower end of a fifth pin rod 19 is hinged to two fourth connecting rods 18, the two fourth connecting rods 18 are arranged in bilateral symmetry, the two fourth connecting rods 18 are hinged to the rear side faces of the two arc-shaped plates 16 respectively, when the medical trash can 15 slides out, the two arc-shaped plates 16 and the push-pull mechanism can slide out together, the cover plate 6 also synchronously rotates at the moment, the arc-shaped plates 16 can slide forwards while synchronously moving with the medical trash can 15 due to the existence of the arc-shaped sliding grooves 42, when the medical trash can 15 finishes moving, the two arc-shaped plates 16 can be attached to the inner wall of the medical trash can 15, when the medical trash can 15 resets when the trash throwing is finished, the arc-shaped plates 16 can move backwards along with the medical trash, and the thrown-.

In the sixth embodiment, as shown in the figure, in order to collect the household garbage and the garbage of the sharps, a filter screen 22 is arranged in the household garbage can 21, a drain pipe 9 is arranged at the lower part of the filter screen 22, the drain pipe 9 penetrates through the right casing of the household garbage can 21, a threaded cap 8 is in threaded connection with the right end of the drain pipe 9, when the household garbage can 21 is full of waste liquid, the threaded cap 8 can be screwed to discharge the waste liquid, a needle head hole 14 and a sharps hole 13 are arranged on the upper end face of the sharps garbage can 12, the needle head hole 14 is a hole with gradually changing distance from top to bottom, needles with different sizes can be detached from a needle tube, and other sharps can be directly thrown into the sharps hole 13.

Seventh embodiment, as shown in fig. 1, 2, 3, 4, 6 and 8, in order to facilitate dumping garbage, a handle 10 is fixedly connected to the rear portion of the cover plate 6, a hinge 7 is hinged to the front portion of the cover plate 6, the lower end face of the hinge 7 is fixedly connected to the support frame 5, when the garbage is full, an upward force is applied to the handle 10 by a hand to open the cover plate 6, since the first pin 43 at the lower portion of each box body is rotatably engaged with the first link 32 by the gravity of the box body, each box body can be taken out upward, and after the box body is put back, the first pin 43 can be continuously engaged with the first link 32, so that each garbage box can be conveniently taken out from above to be dumped in a classified manner.

The utility model discloses during the use, the user only needs to trample running-board 2 and drives transfer line 3 and rotate, and then drive first bevel gear 37 and rotate downwards, the horizontal anticlockwise rotation of second bevel gear 38, disc 33 also carries out anticlockwise rotation, a back shaft 34 of disc 33 center fixedly connected with, a support frame 5 of back shaft 34 top fixedly connected with, support frame 5 top is equipped with one and can follow support frame 5 pivoted apron 6, it has four first connecting rods 32 to articulate on the disc 33, four first connecting rods 32 symmetry are arranged, the upper portion of every first connecting rod 32 all is equipped with a box, every box lower part all fixedly connected with a first pin 43, every first pin 43 and below all articulate with first connecting rod 32, every first connecting rod 32 below all is equipped with a first guide rail 31, every first guide rail 31 all fixedly connected in base 4 inner wall, form domestic waste case 21, The medical garbage can 15, the sharps garbage can 12 and the ampoule garbage can 11 slide in the direction far away from the center of a circle and rotate anticlockwise on the cover plate 6, the garbage can slides out to facilitate the medical staff to throw garbage, after the pedal 2 is trampled, the clockwise rotation reset of the disc 33 can be realized under the action of the first coil spring 35, the garbage cans are stored under the cover plate 6 in a daily state, the pollution and the smell are greatly reduced to be emitted, the cover plate 6 rotates anticlockwise when each garbage can slides out, the second pin rod 39 drives the fifth connecting rod 27 to slide forwards along with the counterclockwise circular motion of the cover plate 6, further drives the extrusion plate 23 to take the bottom hinged point as the center of a circle and the height of the extrusion plate 23 as the radius to move circularly, so that the extrusion plate 23 inclines backwards to facilitate the medical staff to throw in the ampoule bottle, and the inclined plate 40 is arranged in front of the extrusion plate 23, the rear end face of the inclined plate 40 is fixedly connected to the inner wall of the ampoule dustbin 11, when the ampoule dustbin 11 is reset, the extrusion plate 23 rotates backwards and the inclined plate 40 is matched to form a structure for extruding ampoule garbage, the crushed ampoule garbage falls into the ampoule dustbin 11 along with the inclined plate 40, meanwhile, the cover plate 6 rotates, because the lower end face of the front part of the cover plate 6 is provided with an arc chute 42, a third pin rod 44 capable of sliding in the chute is arranged in the arc chute 42, the lower end of the third pin rod 44 is hinged to the push-pull mechanism, two arc plates 16 are hinged in front of the push-pull mechanism, the two arc plates 16 are symmetrically arranged, each arc plate 16 is hinged to the bottom of the medical dustbin 15, when the medical dustbin 15 slides out, the two arc plates 16 and the push-pull mechanism can slide out together, at the moment, the cover plate 6 also synchronously rotates, because the arc chute 42 can enable the arc plates 16 to slide forwards while synchronously moving with the medical dustbin 15, when the movement of the medical garbage can 15 is finished, the two arc-shaped plates 16 are attached to the inner wall of the medical garbage can 15, when the garbage disposal is finished, the medical garbage can 15 is reset, the arc-shaped plates 16 move backwards along with the medical garbage can, thrown-in garbage is pushed into the garbage can, the medical garbage is prevented from blocking the medical garbage can 15, the upper end face of the sharp device garbage can 12 is provided with a needle head hole 14 and a sharp device hole 13, the needle head hole 14 is a hole with gradually changing distance from top to bottom, needle heads with different sizes can be detached from the needle tube, other sharp devices can be directly thrown in from the sharp device hole 13, a filter screen 22 is arranged in the household garbage can 21, the lower part of the filter screen 22 is provided with a discharge pipe 9, the discharge pipe 9 penetrates through the right shell of the household garbage can 21, the right end of the discharge pipe 9 is in threaded connection with a threaded cap 8, when the household garbage can be filled with waste liquid in the household garbage can 21, the threaded cap 8 can be screwed to, after rubbish is full, give handle 10 an ascending power with the hand, flip apron 6, because first pin 43 of every box lower part all carries out normal running fit with first connecting rod 32 by the gravity of box, so can upwards take out every box, and can make first pin 43 and first connecting rod 32 continue the cooperation after putting back, can be very convenient like this all follow the top with every dustbin and take out, categorised empting, and four universal wheels 1 of base 4 below fixedly connected with, can remove the dustbin at will, very big use that has made things convenient for medical personnel.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The simple garbage classification vehicle comprises a base (4) and is characterized in that a rotatable disc (33) is arranged on the base (4), four first connecting rods (32) are uniformly hinged to the disc (33), a box body is arranged on the upper portion of each first connecting rod (32), a first pin rod (43) is fixedly connected to the lower portion of each box body, each first pin rod (43) is hinged to the first connecting rod (32) below the first pin rod, a first guide rail (31) is arranged below each first connecting rod (32), each first guide rail (31) is fixedly connected to the inner wall of the base (4), and the disc (33) rotates to form a structure that each box body slides in the direction far away from the circle center of the disc (33);

the garbage can body comprises a domestic garbage can (21), a medical garbage can (15), a sharp tool garbage can (12) and an ampoule garbage can (11), a push-pull mechanism is arranged in the medical garbage can (15), two arc-shaped plates (16) are hinged in front of the push-pull mechanism, the two arc-shaped plates (16) are symmetrically arranged, each arc-shaped plate (16) is hinged to the bottom of the medical garbage can (15), a supporting shaft (34) is fixedly connected to the center of a disc (33), a supporting frame (5) is fixedly connected to the upper portion of the supporting shaft (34), a cover plate (6) capable of rotating along with the supporting frame (5) is arranged above the supporting frame (5), an arc-shaped sliding groove (42) is formed in the lower end face of the front portion of the cover plate (6), a third pin rod (44) capable of sliding in the arc-shaped sliding groove (42) is arranged in the, the cover plate (6) rotates to form a structure that the two arc plates (16) simultaneously rotate forwards in a circumferential manner by taking hinge points at two sides as circle centers.

2. The simple garbage classification vehicle as claimed in claim 1, wherein the ampoule garbage can (11) comprises a second guide rail (26), a fourth pin rod (29) capable of sliding back and forth in the second guide rail (26) is arranged in the second guide rail (26), the second guide rail (26) is fixedly connected to the inner wall of the front part of the ampoule garbage can (11), a second connecting rod (30) is hinged to the upper part of the fourth pin rod (29), a second pin rod (39) is hinged to the left end of the second connecting rod (30), the second pin rod (39) is fixedly connected to the lower end surface of the cover plate (6), a fifth connecting rod (27) is hinged to the lower end of the fourth pin rod (29), a squeezing plate (23) is hinged to the lower part of the fifth connecting rod (27), a support plate (24) is hinged to each side of the squeezing plate (23), and the two support plates (24) are fixedly connected to the inner wall of the ampoule garbage can (11), an inclined plate (40) is arranged in front of the pressing plate (23), the rear end face of the inclined plate (40) is fixedly connected to the inner wall of the ampoule garbage can (11), and the cover plate (6) rotates to form a structure that the pressing plate (23) presses ampoule garbage.

3. The simple garbage classification vehicle according to claim 1, wherein the push-pull mechanism comprises a third guide rail (25), a fifth pin rod (19) capable of sliding back and forth in the third guide rail (25) is arranged in the third guide rail (25), the third guide rail (25) is fixedly connected to the inner wall of the rear portion of the medical garbage can (15), a third connecting rod (20) is arranged above the fifth pin rod (19), a second coil spring is fixedly connected to the upper end of the fifth pin rod (19), the lower end face of the third connecting rod (20) is fixedly connected to the upper end face of the second coil spring, the rear end of the third connecting rod (20) is hinged to the third pin rod (44), two fourth connecting rods (18) are hinged to the lower end of the fifth pin rod (19), the two fourth connecting rods (18) are symmetrically arranged left and right, and the two fourth connecting rods (18) are hinged to the rear side faces of the two arc-shaped plates (16) respectively.

4. The simple garbage classification vehicle as claimed in claim 1, wherein a fixed block (36) is fixedly connected below the base (4), a transmission rod (3) capable of rotating in the fixed block (36) is arranged in the fixed block (36), a first bevel gear (37) is fixedly connected to the right end of the transmission rod (3), a second bevel gear (38) is meshed above the first bevel gear (37), the upper end face of the second bevel gear (38) is fixedly connected to the disc (33), a coil spring is fixedly connected to the lower end face of the base (4), the lower end face of the coil spring is fixedly connected to the transmission rod (3), and a pedal (2) is fixedly connected to the left end of the transmission rod (3).

5. The simple garbage classification vehicle as claimed in claim 1, wherein a filter screen (22) is arranged in the household garbage can (21), a sewage discharge pipe (9) is arranged at the lower part of the filter screen (22), the sewage discharge pipe (9) penetrates through the right shell of the household garbage can (21), and a threaded cover (8) is in threaded connection with the right end of the sewage discharge pipe (9).

6. Simple vehicle for sorting refuse according to claim 1, characterised in that the sharps refuse receptacle (12) is provided with a needle hole (14) and a sharps hole (13) at its upper end.

7. The simple garbage classification vehicle as claimed in claim 1, wherein a handle (10) is fixedly connected to the rear portion of the cover plate (6), a hinge (7) is hinged to the front portion of the cover plate (6), and the lower end face of the hinge (7) is fixedly connected to the support frame (5).

8. The simple garbage classification vehicle as claimed in claim 1, wherein the lower end surface of the base (4) is fixedly connected with four universal wheels (1), and the four universal wheels (1) are symmetrically arranged.