A new type of blood circulation machine

Abstract

This utility model discloses a novel blood circulation machine, relating to the technical field of blood circulation machines. It includes a housing comprising a first lower shell and a first upper shell. A second driving component is located at the center of the first lower shell to drive the eccentric movement of the first upper shell. Several rubber pillars are disposed between the first lower shell and the first upper shell. The blood circulation machine also includes a lifting mechanism. This novel blood circulation machine, by activating the second driving component to drive the first upper shell (i.e., the person) in eccentric circular motion, simultaneously activates the first driving component in both forward and reverse directions, causing it to drive a reduction gear set to rotate in both directions. This, in turn, drives a screw to rotate in both directions, ultimately causing the massage head to reciprocate up and down along the screw. This allows for deep massage stimulation of acupoints on the feet, especially beneficial for people with excess fat in their feet. During the upward movement of the massage head, the acupoints on the feet receive deep massage stimulation, resulting in a very good massage effect.

Description

Technical Field

[0001] This utility model relates to the field of blood circulation machine technology, and in particular to a novel blood circulation machine. Background Technology

[0002] Different parts of the human body have different acupoints, including many on the soles of the feet. By finding the corresponding reflex zones on the feet and massaging different parts of the soles, the circulation of blood and qi in the body can be accelerated. The blood circulation machine is a kind of physiotherapy equipment that uses a pedal set on the upper surface of the shell to vibrate at high frequency. When the feet are on the pedal, the movement of the body is driven to promote blood circulation.

[0003] A Chinese utility model patent, published on January 4, 2022, with publication number CN215385644U, describes a heat therapy blood circulation machine. It adds a heat-conducting plate and heating element to the pedal surface, increasing the heat therapy function without increasing the thickness. Furthermore, the stainless steel heat-conducting plate is not only aesthetically pleasing, durable, and easy to clean, but also serves as an electrode in conjunction with the built-in pulse generator to achieve electronic pulse therapy, thus realizing a dual-purpose function. It also optimizes the internal structure of the casing, making it more compact and rigid. The suspended vibration motor assembly scheme maximizes the transfer of rotational mechanical energy to the pedal, ensuring efficient pedal movement.

[0004] However, the massage bumps of this blood circulation machine can only perform eccentric circular motion in the horizontal direction. The height of the massage bumps cannot be adjusted. Especially for some people with more fat on their feet, when the height of the massage bumps is too low, it is impossible to deeply massage and stimulate the acupoints on the feet, and the massage effect is not good. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a new type of blood circulation machine to solve the problem that the height of the massage bumps cannot be adjusted. Especially for some people with more fat on their feet, when the height of the massage bumps is too low, it is impossible to deeply massage and stimulate the acupoints on the feet, thus failing to achieve a good massage effect.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a novel blood circulation machine, comprising a housing, the housing including a first lower housing and a first upper housing, a second driving member for driving the eccentric movement of the first upper housing is provided at the center of the first lower housing, and a plurality of rubber pillars are provided between the first lower housing and the first upper housing; the blood circulation machine further includes:

[0007] The lifting mechanism includes a first driving member, two reduction gear sets and a screw. The two reduction gear sets are symmetrically arranged in the housing. Each reduction gear set includes a number of reduction gears that mesh sequentially. At least one reduction gear in each reduction gear set is helically engaged with the screw. The two reduction gear sets are arranged in an arc shape and the arc opening faces the second driving member.

[0008] A massage head that extends through the first upper shell and is located at the top of the screw.

[0009] Preferably, the blood circulation machine further includes an arc-shaped outer shell, which is detachably fixed to the bottom surface of the first upper shell, and the reduction gear set is rotatably disposed inside the arc-shaped outer shell.

[0010] Preferably, the lifting mechanism further includes a worm gear and a worm, and the reduction gear set includes a first reduction gear, at least one second reduction gear, and at least one third reduction gear rotatably disposed within the arc-shaped housing. The third reduction gear is centrally helically engaged with a screw. The first driving component is a first motor, which is fixed to the outer surface of the arc-shaped housing. The output end of the first motor is fixedly connected to the worm. The worm meshes symmetrically with two worm gears. The worm gears are coaxially rotatably disposed within the arc-shaped housing with the first reduction gear. The first reduction gear meshes with the second reduction gear, and the second reduction gear meshes with either the second or third reduction gear. The diameter of the second reduction gear is larger than the diameter of the first reduction gear, and the diameter of the second reduction gear is smaller than the diameter of the third reduction gear.

[0011] Preferably, the bottom end of the screw is provided with at least one limiting block, the bottom of the arc-shaped outer shell is provided with a limiting part, and the limiting part is provided with a limiting straight groove adapted to the limiting block along the length direction of the screw on the side facing the limiting block.

[0012] Preferably, the top surface of the first upper shell has two symmetrical notches, and a sealing plate adapted to the notch can be detachably fixed in the notch. The sealing plate is located around the massage head, and a first heating plate is provided on the bottom surface of the sealing plate. The sealing plate has a plurality of heating holes.

[0013] Preferably, a recessed portion is provided on one side of the bottom surface of the first lower shell, and a damping support is provided in the recessed portion. The support has a folded state and a supported state. When the support is in the folded state, the shell is in a horizontal state. When the support is in the supported state, the shell is in an inclined state. The arc-shaped outer shell and the recessed portion are located on both sides of the second driving member.

[0014] Preferably, the second driving component is a second motor, the output end of the second motor is fixedly connected to an eccentric block, the eccentric block is fixedly connected to the first upper shell through a bearing, and the first motor and the second motor are located on both sides of the arc-shaped outer shell.

[0015] Preferably, both sides of the top surface of the first upper shell are embedded with anti-slip plates with anti-slip texture, and the bottom surface of the anti-slip plates is provided with a second heating plate.

[0016] Preferably, the bottom of the first lower shell is provided with a plurality of suction cups, and when the bracket is in the folded state, each of the suction cups is at the same height.

[0017] Compared with the prior art, the beneficial effects that this utility model can achieve are:

[0018] (1) By starting the second drive unit to drive the first upper shell, i.e., the human body, to move in an eccentric circular motion, the first drive unit is started in the forward and reverse directions, so that it drives the reduction gear set to rotate in the forward and reverse directions, thereby driving the screw to rotate in the forward and reverse directions, and finally driving the massage head to move up and down along the screw, so that the acupoints on the human foot can be deeply massaged and stimulated. Especially for some people with more fat on their feet, the acupoints on their feet can be deeply massaged and stimulated during the upward movement of the massage head, which has a very good massage effect.

[0019] (2) By arranging the two reduction gear sets in an arc shape with the arc opening facing the second drive unit, the overall structure can be made more compact. Under the same size of the housing, more space can be reserved compared to the reduction gear sets arranged in a straight line or L-shape. This reserved space can be used to install more rubber columns (if the reduction gear sets are arranged in a straight line or L-shape, more rubber columns need to be installed, then the size of the housing needs to be increased). This allows the blood circulation machine to support heavier people and drive their movement, avoiding the problem of the person being too heavy and softening the rubber columns, causing the blood circulation machine to malfunction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the first lower shell, rubber column, arc-shaped outer shell, first driving component, second driving component, eccentric block, massage head and concave part of this utility model;

[0022] Figure 3 This is a schematic diagram of the second lower shell, lifting mechanism, and massage head structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the third reduction gear, screw, limiting block and massage head of this utility model;

[0024] Figure 5 This is a schematic diagram of the first lower shell, support, and suction cup structure of this utility model;

[0025] Figure 6This is a schematic diagram of the sealing plate, heating holes, anti-slip plate, and second heating plate of this utility model;

[0026] The components include: 1. Housing; 101. First lower housing; 1011. Recessed portion; 102. First upper housing; 2. Arc-shaped outer housing; 201. Second lower housing; 202. Second upper housing; 3. Lifting mechanism; 301. First driving component; 302. Worm gear; 303. Worm wheel; 304. First reduction gear; 305. Second reduction gear; 306. Third reduction gear; 307. Screw; 308. Limiting block; 4. Massage head; 5. Sealing plate; 51. Heating and heat transmission hole; 6. First heating plate; 7. Second driving component; 8. Eccentric block; 9. Rubber column; 10. Anti-slip plate; 11. Second heating plate; 12. Bracket; 13. Suction cup. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model.

[0028] like Figures 1-4 As shown, this utility model provides a novel blood circulation machine, including a housing 1. The housing 1 includes a first lower housing 101 and a first upper housing 102. Both the first lower housing 101 and the first upper housing 102 are square, and the four corners are rounded. A second driving member 7 for driving the eccentric movement of the first upper housing 102 is provided at the center of the first lower housing 101. A plurality of rubber pillars 9 are provided between the first lower housing 101 and the first upper housing 102 (taking the example of one rubber pillar 9 being provided at each of the four corners of the first lower housing 101). The blood circulation machine also includes a lifting mechanism 3 and a massage head 4.

[0029] The lifting mechanism 3 includes a first driving member 301, two reduction gear sets and a screw 307. The two reduction gear sets are symmetrically arranged in the housing 1. Each reduction gear set includes several reduction gears that mesh sequentially. At least one reduction gear in each reduction gear set is helically screwed into the screw 307. The two reduction gear sets are arranged in an arc shape and the arc opening faces the second driving member 7.

[0030] The massage head 4 moves through the first upper shell 102 and is located at the top of the screw 307. The massage head 4 can be screwed and fixed to the screw 307, which makes it convenient to disassemble and replace the massage head 4.

[0031] When in use, people stand on the first upper shell 102. By activating the second drive component 7, the first upper shell 102 (i.e., the person) moves in an eccentric circular motion. At the same time, the first drive component 301 is activated in both directions, causing the reduction gear set to rotate in both directions. This, in turn, causes the screw 307 to rotate in both directions, ultimately causing the massage head 4 to move up and down along the screw 307. This allows for deep massage stimulation of the acupoints on the feet. Especially for people with more fat on their feet, the massage head 4 can provide deep massage stimulation of the acupoints on their feet during its upward movement, resulting in a very good massage effect.

[0032] By arranging the two reduction gear sets in an arc shape with the arc openings facing the second drive component 7, the overall structure becomes more compact. For the same size housing 1, compared to reduction gear sets arranged in a straight line or L-shape, more space can be reserved (e.g., ...). Figure 2 As shown at point A in the diagram, this reserved space can accommodate more rubber columns 9 (if a reduction gear set is arranged in a straight line or L-shape, and more rubber columns 9 are required, then the size of the casing 1 needs to be increased), so that the blood circulation machine can support a heavier person and drive their movement, avoiding the problem of the person being too heavy and softening the rubber columns 9, causing the blood circulation machine to malfunction.

[0033] Meanwhile, the two reduction gear sets arranged in an arc shape can reduce bending moment and torque loss in power transmission. In reduction gear sets arranged in a straight line or L-shape, the power transmission path from the first driving component 301 to the reduction gear set may be relatively simple or have some sharp turns, which can easily lead to energy loss. However, the two reduction gear sets arranged in an arc shape can reduce power loss in the transmission process and improve transmission efficiency through a more natural path curvature and the synergistic effect of multiple reduction gears.

[0034] It should be noted that the height of the massage head 4 is adjustable (the specific adjustment method can be adjusted by Hall element sensing and controller, which is relatively advanced technology and will not be elaborated here), thus meeting the massage needs of different people.

[0035] like Figure 2 and Figure 3 As shown, the blood circulation machine also includes an arc-shaped outer shell 2, which is detachably fixed to the bottom surface of the first upper shell 102 (specifically, it can be disassembled and fixed by screws), and the reduction gear set is rotatably located inside the arc-shaped outer shell 2;

[0036] By fixing the arc-shaped outer shell 2 to the bottom surface of the first upper shell 102, when the second driving component 7 drives the first upper shell 102 to perform eccentric circular motion, the arc-shaped outer shell 2, the reduction gear set, and the massage head 4 will all perform eccentric circular motion simultaneously. There will be no relative movement in the horizontal direction between the massage head 4 and the first upper shell 102, ensuring that when a person stands on the first upper shell 102, the massage position of the massage head 4 on the person's feet will not change, and a single acupoint on the person's feet can be massaged for a long time. When a person needs to change the massage area, they only need to move the position of their feet.

[0037] Conversely, if a person is to stand on the first upper shell 102, the second driving component 7 can drive the first upper shell 102 to move eccentrically in a circular motion. When the massage head 4 is not in a horizontal position, the arc-shaped outer shell 2 can be fixed on the first lower shell 101. In this way, when the first upper shell 102 moves eccentrically in a circular motion, the massage head 4 can massage different parts of the person's feet, increasing the massage range, but it cannot massage a single part for a long time.

[0038] Since the second driving component 7 can drive the first upper shell 102 to move eccentrically, there is a gap between the first upper shell 102 and the first lower shell 101. Dust and impurities can easily enter the housing 1 through the gap between them. By setting the arc-shaped outer shell 2, the reduction gear set can be rotatably set inside the arc-shaped outer shell 2, thereby preventing dust and impurities from entering the housing 1 and adhering to the reduction gear, affecting its transmission efficiency or jamming, and preventing noise generation, avoiding wear of the reduction gear and affecting the transmission accuracy.

[0039] Specifically, the arc-shaped outer shell 2 includes a second lower shell 201 and a second upper shell 202 that are detachably and fixedly connected, which facilitates the disassembly, repair, or replacement of the reduction gear set inside the arc-shaped outer shell 2.

[0040] like Figure 3 and Figure 4As shown, the lifting mechanism 3 also includes a worm gear 303 and a worm 302. The reduction gear set includes a first reduction gear 304 rotatably disposed within the arc-shaped outer shell 2, at least one second reduction gear 305, and at least one third reduction gear 306 (all rotatably disposed on the second lower shell 201). The center of the third reduction gear 306 is helically engaged with a screw 307. The first driving component 301 is a first motor, which is fixed to the outer surface of the arc-shaped outer shell 2 (specifically, the side wall of the second lower shell 201). The output end of the first motor is fixedly connected to the worm 302. The worm 302 meshes symmetrically with two worm gears 303. The worm gears 303 and the first reduction gear 304 are coaxially rotated inside the arc-shaped outer shell 2 (specifically, they are coaxially rotated on the second lower shell 201). The first reduction gear 304 meshes with the second reduction gear 305. The second reduction gear 305 meshes with either the second reduction gear 305 or the third reduction gear 306. The diameter of the second reduction gear 305 is larger than the diameter of the first reduction gear 304, and the diameter of the second reduction gear 305 is smaller than the diameter of the third reduction gear 306.

[0041] Here, we take one first reduction gear 304, three second reduction gears 305, and one third reduction gear 306 as an example for explanation: The three second reduction gears 305 mesh sequentially, and the first reduction gear 304 and the third reduction gear 306 mesh with the second reduction gears 305 at both ends respectively. By starting the first motor in the forward direction, it drives the worm 302 to rotate. The worm 302 drives the two worm wheels 303 to rotate. The two worm wheels 303 drive one of the first reduction gears 304 to rotate. The first reduction gear 304 drives the second reduction gear 305 to rotate, and finally realizes the rotation of the third reduction gear 306, thereby driving the screw 307 to move vertically upward perpendicular to the second lower shell 201. Conversely, by starting the first motor in the reverse direction, the screw 307 can move vertically downward. Thus, by switching the first motor in the forward and reverse directions at a timer, the reciprocating lifting motion of the screw 307 can be realized, that is, the reciprocating lifting motion of the massage head 4 can be realized.

[0042] The length of the arc-shaped outer shell 2 can be controlled by the number of the second reduction gears 305, and the distance between the two massage heads 4 can also be controlled.

[0043] By setting the diameter of the second reduction gear 305 to be larger than that of the first reduction gear 304, and the diameter of the second reduction gear 305 to be smaller than that of the third reduction gear 306, the smaller diameter gear drives the larger diameter gear to rotate, thereby achieving a speed reduction effect and preventing the massage head 4 from reciprocating too quickly when the first motor is started.

[0044] like Figure 3 and Figure 4As shown, at least one limiting block 308 is provided at the bottom end of the screw 307, and a limiting part is provided at the bottom of the arc-shaped outer shell 2. A limiting straight groove adapted to the limiting block 308 is opened on the side of the limiting part facing the limiting block 308 along the length direction of the screw 307.

[0045] By setting the limit block 308 and the limit part with the limit groove, the guide limit is played, ensuring that the third reduction gear 306 can drive the screw 307 to move vertically and steadily when it rotates.

[0046] like Figure 1 As shown, the top surface of the first upper shell 102 has two symmetrical notches, and a sealing plate 5 that is adapted to the notch can be detachably fixed in the notch (specifically, it can be fixed by screws). The sealing plate 5 is located around the massage head 4. The bottom surface of the sealing plate 5 is provided with a first heating plate 6, and several heating holes 51 are provided on the sealing plate 5 (not actual countersunk holes, but similar to paint masking holes).

[0047] The separate sealing plate 5 facilitates the individual processing of heating and heat-permeable holes 51 and the installation of the first heating plate 6 on the small sealing plate 5. With the first heating plate 6 set in this way, when a person's feet step on the first upper shell 102, it is convenient to heat the person's feet to achieve the function of heat therapy.

[0048] like Figure 2 and Figure 5 As shown, a recessed portion 1011 is provided on one side of the bottom surface of the first lower shell 101. A damped rotatable bracket 12 is provided in the recessed portion 1011 (the damped rotatable setting prevents the bracket 12 from freely rotating and falling off when it is in the recessed portion 1011). The bracket 12 has a folded state and a supported state. When the bracket 12 is in the folded state, the shell 1 is in a horizontal state. When the bracket 12 is in the supported state, the shell 1 is in an inclined state. The arc-shaped outer shell 2 and the recessed portion 1011 are located on both sides of the second driving member 7.

[0049] By setting the recess 1011, when the bracket 12 is in the folded state, the bracket 12 is horizontally located in the recess 1011, so the housing 1 is in a horizontal state, and people can stand stably on the first upper shell 102. When the bracket 12 is adjusted to rotate, it supports one end of the housing 1 and makes the housing 1 tilted, so that when people are sitting on the chair, their feet can be more comfortably placed on the first upper shell 102 for massage.

[0050] By setting the arc-shaped outer shell 2 and the concave portion 1011 on both sides of the second drive component 7, the overall spatial arrangement is made more reasonable and compact.

[0051] like Figure 2As shown, the second driving component 7 is a second motor, and the output end of the second motor is fixedly connected to the eccentric block 8. The eccentric block 8 is fixedly connected to the first upper shell 102 through the bearing. The first motor and the second motor are located on both sides of the arc-shaped outer shell 2.

[0052] By activating the second motor, the eccentric block 8 can be rotated, thereby causing the first upper shell 102 to rotate eccentrically. By placing the first motor and the second motor on opposite sides of the arc-shaped outer shell 2, compared to placing the first motor and the second motor on the same side of the arc-shaped outer shell 2, the overall structure is more compact, which can minimize the distance between adjacent rubber pillars 9. At the same time, when the first motor and the second motor are placed on the same side of the arc-shaped outer shell 2, the distance between the arc-shaped outer shell 2 and the second motor (the farther the center of the housing 1 is) will increase the length of the arc-shaped outer shell 2 when the massage head 4 is placed in the same position, and increase the number of second reduction gears 305, thus increasing production costs.

[0053] like Figure 1 and Figure 6 As shown, both sides of the top surface of the first upper shell 102 are inlaid with anti-slip plates 10 with anti-slip texture, and the bottom surface of the anti-slip plates 10 is provided with a second heating plate 11.

[0054] By setting up the anti-slip plate 10, a person can stand more stably on the first upper shell 102 when moving eccentrically on it. By setting up the second heating plate 11, the feet can be heated and treated over a wider area.

[0055] like Figure 1 and Figure 5 As shown, the bottom of the first lower shell 101 is provided with several suction cups 13, which enable the shell 1 to be stably attached to the ground and prevent the blood circulation machine from shaking when it is working. When the support 12 is in the folded state, each suction cup 13 is at the same height, so that the shell 1 can be in a horizontal state when the support 12 is in the folded state.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel blood circulation machine, comprising a housing (1), the housing (1) comprising a first lower housing (101) and a first upper housing (102), wherein a second driving member (7) for driving the eccentric movement of the first upper housing (102) is provided at the center of the first lower housing (101), and a plurality of rubber columns (9) are provided between the first lower housing (101) and the first upper housing (102), characterized in that: The blood circulation machine also includes: The lifting mechanism (3) includes a first driving member (301), two reduction gear sets and a screw (307). The two reduction gear sets are symmetrically arranged in the housing (1). Each reduction gear set includes several reduction gears that mesh sequentially. At least one reduction gear in each reduction gear set is helically engaged with the screw (307). The two reduction gear sets are arranged in an arc shape and the arc opening faces the second driving member (7). Massage head (4), which is movable through the first upper shell (102) and located at the top of the screw (307).

2. The new type of air blood circulation machine according to claim 1, characterized in that: The blood circulation machine also includes an arc-shaped outer shell (2), which is detachably fixed to the bottom surface of the first upper shell (102), and the reduction gear set is rotatably disposed inside the arc-shaped outer shell (2).

3. The new air blood circulation machine according to claim 2, characterized in that: The lifting mechanism (3) further includes a worm gear (303) and a worm (302). The reduction gear set includes a first reduction gear (304) rotatably disposed inside the arc-shaped housing (2), at least one second reduction gear (305), and at least one third reduction gear (306). The third reduction gear (306) is centrally helically engaged with a screw (307). The first driving component (301) is a first motor, which is fixed to the outer surface of the arc-shaped housing (2). The output end of the first motor is fixedly connected to the worm (302). The worm (302) and... Two worm gears (303) mesh symmetrically. The worm gears (303) and the first reduction gear (304) are coaxially rotated inside the arc-shaped housing (2). The first reduction gear (304) meshes with the second reduction gear (305). The second reduction gear (305) meshes with either the second reduction gear (305) or the third reduction gear (306). The diameter of the second reduction gear (305) is larger than that of the first reduction gear (304), and the diameter of the second reduction gear (305) is smaller than that of the third reduction gear (306).

4. The new air blood circulation machine according to claim 3, characterized in that: The screw (307) has at least one limiting block (308) at its bottom end, and the arc-shaped outer shell (2) has a limiting part at its bottom. The limiting part has a limiting straight groove adapted to the limiting block (308) along the length direction of the screw (307) on the side facing the limiting block (308).

5. The new air blood circulation machine according to claim 1, characterized in that: The top surface of the first upper shell (102) has two notches symmetrically opened. A sealing plate (5) adapted to the notch can be detachably fixed in the notch. The sealing plate (5) is located around the massage head (4). The bottom surface of the sealing plate (5) is provided with a first heating plate (6). Several heating holes (51) are opened on the sealing plate (5).

6. The new air blood circulation machine according to claim 3, characterized in that: The first lower shell (101) has a recessed part (1011) on one side of its bottom surface. The recessed part (1011) has a damping support (12) inside it. The support (12) has a folded state and a supported state. When the support (12) is in the folded state, the shell (1) is in a horizontal state. When the support (12) is in the supported state, the shell (1) is in an inclined state. The arc-shaped outer shell (2) and the recessed part (1011) are located on both sides of the second driving member (7).

7. The new air blood circulation machine according to claim 3, characterized in that: The second driving component (7) is a second motor. The output end of the second motor is fixedly connected to an eccentric block (8). The eccentric block (8) is fixedly connected to the first upper shell (102) through a bearing. The first motor and the second motor are located on both sides of the arc-shaped outer shell (2).

8. The new air blood circulation machine according to claim 1, characterized in that: The top surface of the first upper shell (102) is inlaid with anti-slip plates (10) with anti-slip texture on both sides, and the bottom surface of the anti-slip plates (10) is provided with a second heating plate (11).

9. The new air blood circulation machine according to claim 6, characterized in that: The bottom of the first lower shell (101) is provided with several suction cups (13). When the bracket (12) is in a folded state, each of the suction cups (13) is at the same height.

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