CN117046036A - A control circuit and control method for an airbag vibration-absorbing and buffering mechanism of a treadmill - Google Patents
A control circuit and control method for an airbag vibration-absorbing and buffering mechanism of a treadmill Download PDFInfo
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B22/00—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements
- A63B22/02—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with movable endless bands, e.g. treadmills
- A63B22/0207—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with movable endless bands, e.g. treadmills having shock absorbing means
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B24/00—Electric or electronic controls for exercising apparatus of preceding groups; Controlling or monitoring of exercises, sportive games, training or athletic performances
- A63B24/0062—Monitoring athletic performances, e.g. for determining the work of a user on an exercise apparatus, the completed jogging or cycling distance
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- Physical Education & Sports Medicine (AREA)
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Abstract
本发明涉及一种跑步机的气囊式减振缓冲机构的控制电路及控制方法，通过所述安全控制电路和控制方法的设计持续监测气囊气压，一方面通过将气囊气压控制在安全阀值范围，另一方面在气囊异常破裂时通过硬件电子电路触发跑步机下控制器紧急停止跑步机运行。确保跑步者不会由于跑台失去气囊支撑而跌倒被运行的跑带带动甩出受伤，以杜绝安全隐患。同时本发明可以在不增加硬件成本情况下，通过内置在单片机存储中的算法软件监测跑步姿态，提醒跑步者纠正跑姿，避免长期跑姿错误引起的膝盖受伤等运动伤害。
The invention relates to a control circuit and a control method for an airbag vibration-absorbing and buffering mechanism of a treadmill. Through the design of the safety control circuit and the control method, the airbag air pressure is continuously monitored. On the one hand, the airbag air pressure is controlled within the safety threshold range. On the other hand, when the air bag ruptures abnormally, the hardware electronic circuit triggers the treadmill's lower controller to emergency stop the treadmill operation. Ensure that runners will not fall and be thrown out by the running belt due to the loss of airbag support on the treadmill, thereby eliminating potential safety hazards. At the same time, the present invention can monitor the running posture through the algorithm software built into the microcontroller storage without increasing the hardware cost, remind the runner to correct the running posture, and avoid knee injuries and other sports injuries caused by long-term running posture errors.
Description
Technical Field
The invention belongs to the technical field of fitness equipment, and particularly relates to a control circuit and a control method of an air bag type vibration reduction buffer mechanism of a running machine.
Background
Running machines are commonly used exercise equipment, widely used in homes and business gymnastics. In order to reduce the impact force of the running platform, in particular to adjust the vibration reduction and buffering elastic quantity of the running platform, more and more running machines adopt an air bag as an elastic functional supporting component of a running platform running plate.
However, the prior art does not consider that when the airbag is abnormally ruptured, a runner can fall down due to the fact that the running platform loses the airbag support, and particularly the problem that the runner is dangerous under the condition of high speed is solved, and the airbag damping and buffering mechanism has a great potential safety hazard.
The invention of a running board and a running machine for realizing the self-adjustment of the soft hardness of the running board, such as the publication number CN 113018766A of the Chinese invention patent application, comprises a frame, a running board body, an air bag, a sinking monitor and an infrared light emitting tube, wherein the running board body is arranged on the frame, the air bag is arranged on the frame, the top of the air bag is propped against the running board body, the sinking monitor and the infrared light emitting tube are used for monitoring the sinking amplitude of the running board body, and the hardness of the running board body is adjusted by inflating/deflating the air bag according to the monitoring data of the sinking monitor; the patent only considers that the automatic regulation of the air bag air pressure according to the detected sinking amplitude achieves the aim of realizing the self-regulation of the hardness of the running plate, and the infrared emission and receiving tube is easily covered by dust to fail and can not normally control the air bag air pressure, and the patent does not consider the potential safety hazard caused by abnormal fracture of the air bag.
And as per the running machine with damping function and the self-adaptive adjusting method of damping performance of the running machine, as per the Chinese patent application publication No. CN113663285A, a running platform underframe and a running plate arranged on the running platform underframe are provided, a damping device is arranged between the running plate and the running platform underframe, the damping device comprises an installation seat arranged on the running platform underframe and an air bag arranged in the installation seat, the upper top surface of the air bag is in butt joint or clearance fit with the lower bottom surface of the running plate, an air pressure sensor and an air pump which are communicated with the inside of the air bag are arranged on the running platform underframe, a control valve is arranged on the air bag, and a control system which is in signal connection with the air pump, the control valve and the air pressure sensor is arranged on the running platform underframe. Mainly also through gasbag atmospheric pressure detection, automatically regulated gasbag atmospheric pressure reaches the fat reduction function of adaptation weight, and the potential safety hazard that the gasbag breaks and causes is not considered yet to this patent.
The running machine adopting the air bag type vibration reduction buffer mechanism can achieve good vibration reduction buffer effect by adjusting air bag air pressure, improves running comfort and reduces impact to knees, but because the air bag continuously impacts in the running process, the air bag air pressure is adjusted out of control, or the air bag is aged, or the air bag is broken caused by abnormal conditions such as sharp foreign body collision, the air bag breaks, the running platform loses important supporting parts after the air bag breaks, a runner is easy to fall down, and particularly, the running belt falls down more dangerously in high-speed running. The prior art fails to address this problem.
On the other hand, as more and more people run on the running machine, however, many people will cause sports injuries such as knee injury due to incorrect long-term running posture, such as unbalanced left and right foot landing or body side-to-side swing, or too high recoil force caused by too high soaring. At present, the running posture monitoring and correcting method mainly comprises the steps of hanging and clamping the running posture sensor on a shoe or a waist, but the hanging and clamping method is incorrect and affects the monitoring accuracy due to the fact that the hanging and clamping device is inconvenient to use. In addition, although the professional sports running platform adopts a plurality of cameras to monitor running postures at a plurality of angles, the cost is very high, and the sports running platform cannot be popularized to the public for use.
Disclosure of Invention
In view of the shortcomings of the prior art, the technical problem to be solved by the invention is to provide a control circuit and a control method of an air bag type vibration damping buffer mechanism of a running machine, which can monitor the running condition of the running machine and stop the running machine when the running condition is abnormal, and can detect the running posture of a user to correct and guide the user to run correctly.
In order to solve the technical problems, the invention adopts the following technical scheme: the control circuit of the air bag type vibration reduction buffer mechanism of the running machine comprises a running machine main system, a left air bag air pressure sensor, a right air bag air pressure sensor, a left air pressure electric signal amplifier, a right air pressure electric signal amplifier and a control system; the left air bag air pressure sensor is electrically connected with the left air pressure electric signal amplifier, the right air bag air pressure sensor is electrically connected with the right air pressure electric signal amplifier, the control system is electrically connected with the left air bag air pressure sensor, the right air bag air pressure sensor, the left air pressure electric signal amplifier and the right air pressure electric signal amplifier, and the control system is electrically connected with the running machine main system.
Further, the control circuit also comprises a singlechip, a left analog-to-digital converter, a right analog-to-digital converter, an air pump driver, an air pump motor, a left in-out electric valve module and a right in-out electric valve module. The left analog-to-digital converter is electrically connected with the left air pressure electric signal amplifier and is electrically connected with the singlechip; the right analog-to-digital converter is electrically connected with the right air pressure electric signal amplifier and is electrically connected with the singlechip; the singlechip is electrically connected with the air pump driver, and the air pump driver is electrically connected with the air pump motor; the singlechip is electrically connected with the running machine main system.
Further, the single chip microcomputer is internally provided with a storage medium for storing running gesture monitoring algorithm software code modules, and the storage medium comprises a running flight time algorithm module, a running touchdown time module, a left-right balance proportion algorithm module, a running step number step frequency algorithm module and a stride algorithm module which relate to foot landing and body swinging gestures.
A control method of an air bag type vibration reduction buffer mechanism of a running machine comprises the following steps:
s1, under normal standby or normal operation of the running machine, a control system outputs a preset level signal, and a running machine main system does not trigger actions;
s2, judging whether the running machine is normal or not by detecting an electric signal of an air bag air pressure sensor;
s3, when the air bag air pressure sensor senses an electric signal of low air pressure, the running machine stops.
Further, the specific steps of step S1 are as follows: under the condition that the running machine stands by or a user runs, the air pressure of the air bag changes along with the rise and fall of the footsteps, and the control system outputs a preset level signal, so that the action of the running machine main system can not be triggered.
Further, the specific steps of step S2 and step S3 are as follows: when the impact force of the falling footstep caused by a user exceeds the upper limit of the air bag or the air bag is damaged, the air pressure of the corresponding air bag is rapidly reduced, the left air bag air pressure sensor or the right air bag air pressure sensor senses an electric signal with very low air pressure, the corresponding electric signal triggers the corresponding air pressure electric signal amplifier to output a reverse level signal, the reverse level signal is input to the control system, the control system outputs the reverse level signal, the power supply of the main motor driving circuit of the running machine is triggered to be closed, the running belt is stopped, and the user is ensured not to be thrown out and injured by the running belt.
Further, in step S2, whether the running posture of the runner is normal is detected through the storage medium built in the single chip microcomputer, the storage medium built in the single chip microcomputer stores the running mode monitoring algorithm software code module, and the running mode monitoring algorithm software code module judges the mode according to the left air bag air pressure value and the right air bag air pressure value change waveform corresponding to the process of collecting when the left foot and the right foot are grounded, and the mode of grounding is three modes of front sole grounding, full sole grounding and heel grounding.
1. Compared with the prior art, the invention has the following beneficial effects: according to the invention, the air pressure of the air bag is continuously monitored through the design of the control system, on one hand, the air pressure of the air bag is controlled in a safety threshold range, and on the other hand, when the air bag is abnormally broken, through the cooperation of the left air bag air pressure sensor, the right air bag air pressure sensor, the left air pressure electric signal amplifier and the right air pressure electric signal amplifier, the air bag air pressure sensor and the electric signal amplifier at the corresponding broken parts generate electric signals to the control system, so that the control system generates electric signals to the main system of the running machine, the main system of the running machine emergently stops running of the running machine, and the running machine is ensured not to fall down due to the loss of the air bag support of the running table, so that potential safety hazards are avoided.
2. Under the condition of not increasing hardware cost, running gestures are monitored through algorithm software built in the singlechip storage, a runner is reminded to correct the running gestures, and sports injuries caused by long-term running gesture errors are avoided.
Drawings
FIG. 1 is a schematic diagram of the circuit principle of the control circuit of the present invention;
FIG. 2 is a graph of forefoot contact in accordance with the present invention;
FIG. 3 is a graph of full sole strike in accordance with the present invention;
fig. 4 is a graph of heel strike in accordance with the present invention.
The marks in the figure: 1. a treadmill main system; 2. a left air bag air pressure sensor; 3. a right air bag air pressure sensor; 4. a left pneumatic electric signal amplifier; 5. a right pneumatic electric signal amplifier; 6. a control system; 7. a single chip microcomputer; 8. a left analog-to-digital converter; 81. a right analog-to-digital converter; 9. an air pump driver; 91. an air pump motor; 10. left in-out electric valve module; 101. right in and out electric valve module.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 4, the present embodiment provides a treadmill including a treadmill body, a running belt, an air bag, and a control circuit.
The running belt is arranged in the running area of the running machine body, the middle part of the running belt is provided with a running plate, the air bags are in a rectangular shape or an elliptic shape, and the left side and the right side below the running plate are arranged as supporting points of the running plate.
The control circuit comprises a running machine main system 1, a left air bag air pressure sensor 2, a right air bag air pressure sensor 3, a left air pressure electric signal amplifier 4, a right air pressure electric signal amplifier 5, a control system 6, a singlechip 7, a left analog-to-digital converter 8, a right analog-to-digital converter 81, an air pump driver 9, an air pump motor 91, a left in-out electric valve module 10 and a right in-out electric valve module 101.
The left air bag air pressure sensor 2 is electrically connected with the left air pressure electric signal amplifier 4, the right air bag air pressure sensor 3 is electrically connected with the right air pressure electric signal amplifier 5, the control system 6 is electrically connected with the left air bag air pressure sensor 2, the right air bag air pressure sensor 3, the left air pressure electric signal amplifier 4 and the right air pressure electric signal amplifier 5, and the control system 6 is electrically connected with the running machine main system 1.
The running machine main system 1 is used for controlling the starting and stopping of a main motor of a running belt of the running machine, the left analog-to-digital converter 8 is electrically connected with the left air pressure electric signal amplifier 4, and the left analog-to-digital converter 8 is electrically connected with the singlechip 7; the right analog-to-digital converter 81 is electrically connected with the right air pressure electric signal amplifier 5, and the right analog-to-digital converter 81 is electrically connected with the singlechip 7; the singlechip 7 is electrically connected with the air pump driver 9, and the air pump driver 9 is electrically connected with the air pump motor 91; the air pump motor 91 is communicated with the air bag, and the singlechip 7 is electrically connected with the running machine main system 1.
The singlechip 7 is internally provided with a storage medium, the singlechip 7 is internally provided with a storage medium for storing running gesture monitoring algorithm software code modules, and the storage medium comprises a running flight time length algorithm module, a running ground contact time length module, a left-right balance proportion algorithm module, a running step number-step frequency algorithm module and a stride algorithm module which relate to foot landing and body swinging gestures.
The running gesture monitoring algorithm software code module is internally provided with an air bag air pressure threshold value so as to judge the ground-free empty state and the ground-touching state and the time length, and the algorithm is as follows:
the upper threshold is p_threshold_high and the lower threshold is p_threshold_low.
Before running, the upper threshold value and the lower threshold value are detected, calibrated and corrected.
Assuming that the n-th left air bag air pressure value is: p_left_n.
The n-th right air bag air pressure value is: p_right_n.
When P_left_n < P_threshold_low.
Record left foot off-ground flight time: t_left_awayn.
Left foot ground-off air pressure: p_left_away_n=p_left_n.
And sets the left foot status flag to 1, i.e., ground clearance status: left_root_status=1.
When p_right_n < p_threshold_low.
Record right foot off-ground flight time: t_right_awayn.
Right foot off ground air bag pressure: p_right_away_n=p_right_n.
And sets the right foot status flag to 1, i.e., ground clearance status: right_root_status=1.
When p_left_n > p_threshold_high and left_root_status=1.
Recording the left foot contact time: t_left_touch.
Left foot ground contact air bag pressure: p_left_touch_n=p_left_n.
And sets the left foot status flag to 0, i.e., the ground contact status: left_root_status=0.
When p_right_n > p_threshold_high and right_root_status=1.
Recording the right foot contact time: t_right_touch.
Right foot ground contact air bag pressure: p_right_touch_n=p_right_n.
And sets the right foot status flag to 0, i.e., the ground contact status: right_root_status=0.
The running flight duration algorithm module comprises: the left foot emptying time length, the right foot emptying time length, the total average left foot emptying time length, the total average right foot emptying time length, the right foot driving double-foot emptying time length, the total average right foot driving double-foot emptying time length, the left foot driving double-foot emptying time length and the total average left foot driving double-foot emptying time length are calculated, and the algorithm is as follows: (touchdown refers to the foot falling in contact with the running belt and impacting the running deck through the running belt and then transmitting the impact force through the running deck to the left and right airbags under the running deck)
N-th left foot vacation time period:
T_left_awayn＝t_left_touchn-t_left_awayn。
calculating the right foot vacation time length of the nth time:
T_rightt_awayn＝t_right_touchn-t_right_awayn。
total average left foot flight duration:
total average right foot flight duration:
length of time of double feet vacation for nth time
With the left foot in front: when t_left_touch > t_right_awayn.
The nth double foot flight time of the right foot drive:
T_body_away_1n＝t_left_touchn-t_right_awayn。
total average right foot drive bipedal length of time for emptying
With the right foot in the forward position: when t_right_touchn > t_left_awayn.
The nth double foot flight time of the left foot drive:
T_body_away_2n＝t_right_touchn-t_left_awayn。
total average left foot drive bipedal length of time
The running touchdown duration algorithm module comprises: the left foot ground contact time length and the right foot ground contact time length of each time are calculated, and the total average left foot ground contact time length and the total average right foot ground contact time length are calculated by the following algorithm:
n-time left foot touchdown duration:
T_left_touchn＝t_left_awayn+1-t_left_touchn。
total average left foot strike duration:
the nth right foot touchdown period:
T_right_touchn＝t_right_awayn+1-t_right_touchn。
total average right foot strike duration:
the left-right balance proportion algorithm module comprises calculation of a total average left-right touchdown time length balance proportion and a total average left-right touchdown impact balance proportion, namely:
the total average left and right touchdown time length balance proportion is as follows:
left touchdown duration ratio: t_balance_ratio_left=t_left_touch/(t_left_touch+t_right_touch) ×100%.
Right touchdown duration ratio: t_balance_ratio_right=t_right_touch/(t_left_touch+t_right_touch) ×100%.
The nth left foot strike force is f_left_touch_n=p_left_touch_n-p_left_away_n.
Total average left foot strike force:
the nth right foot strike force is f_right_touch_n=p_right_touch_n-p_right_away_n.
Total average right ground contact impact force:
the total average left and right ground contact impact force balance proportion is calculated by the algorithm:
left foot touchdown impulse Ratio: f_balance_ratio_left=f_left_touch/(f_left_touch+f_right_touch).
The right foot strike force Ratio is f_balance_ratio_right=f_right_touch/(f_left_touch+f_right_touch).
The running step number step frequency algorithm module comprises the following algorithm: the Step counter and the Second accumulator Second Timer.
When the running machine is in standby, the Step counter step_counter=0 is set.
After running the running machine: the Second accumulator second_timer starts timing:
step_counter+1 when the right foot status flag right_foot_status goes from 1 to 0.
Step_counter+1 when the left foot status flag left_foot_status goes from 1 to 0.
The number of steps is as follows: step_counter.
The average step frequency is: cadence = step_counter/(second_timer/60).
The scheme adopts the structure and provides a control method of the air bag type vibration reduction buffer mechanism of the running machine, which comprises the following steps:
s1, under normal standby or normal operation of the running machine, the control system 6 outputs a preset level signal, and the running machine main system 1 does not trigger actions; the specific steps of the step S1 are as follows: under the condition that the running machine is in standby or running by a user, the air pressure of the air bag changes along with the rise and fall of the footsteps, and the control system 6 outputs a preset level signal, so that the action of the running machine main system 1 is not triggered.
S2, judging whether the running machine is normal or not by detecting an electric signal of an air bag air pressure sensor;
s3, when the air bag air pressure sensor senses an electric signal of low air pressure, the running machine stops.
The specific steps of step S2 and step S3 are as follows: when the impact force of the falling footstep caused by a user exceeds the upper limit of the air bag or the air bag is damaged, the air pressure of the corresponding air bag is rapidly reduced, the left air bag air pressure sensor 2 or the right air bag air pressure sensor 3 senses an electric signal with very low air pressure, the corresponding electric signal triggers the corresponding air pressure electric signal amplifier to output a reverse level signal, the reverse level signal is input to the control system 6, the control system 6 outputs the reverse level signal, the main motor driving circuit power supply of the running machine is triggered to be closed by the main system 1 of the running machine, the running belt is stopped, and the user is ensured not to be thrown out of the running belt to be injured.
In step S2, whether the running machine is normal is detected through a storage medium built in the singlechip 7, the storage medium built in the singlechip 7 stores a running mode monitoring algorithm software code module, and the running mode monitoring algorithm software code module judges a running mode according to a left air bag air pressure value and a right air bag air pressure value change waveform corresponding to a process acquired when the left foot and the right foot are landed, wherein the running mode is three modes of front sole landing, full sole landing and heel landing, as shown in fig. 2-4.
While the basic principles and main features of the invention and advantages of the invention have been shown and described, it will be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, which are described in the foregoing description merely illustrate the principles of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents.
Claims (7)
1. The control circuit of the air bag type vibration reduction buffer mechanism of the running machine comprises a running machine main system and is characterized in that: the device also comprises a left air bag air pressure sensor, a right air bag air pressure sensor, a left air pressure electric signal amplifier, a right air pressure electric signal amplifier and a control system; the left air bag air pressure sensor is electrically connected with the left air pressure electric signal amplifier, the right air bag air pressure sensor is electrically connected with the right air pressure electric signal amplifier, the control system is electrically connected with the left air bag air pressure sensor, the right air bag air pressure sensor, the left air pressure electric signal amplifier and the right air pressure electric signal amplifier, and the control system is electrically connected with the running machine main system.
2. The control circuit for an air bag type vibration damping buffer mechanism of a treadmill of claim 1, wherein: the control circuit also comprises a singlechip, a left analog-to-digital converter, a right analog-to-digital converter, an air pump driver, an air pump motor, a left in-out electric valve module and a right in-out electric valve module. The left analog-to-digital converter is electrically connected with the left air pressure electric signal amplifier and is electrically connected with the singlechip; the right analog-to-digital converter is electrically connected with the right air pressure electric signal amplifier and is electrically connected with the singlechip; the singlechip is electrically connected with the air pump driver, and the air pump driver is electrically connected with the air pump motor; the singlechip is electrically connected with the running machine main system.
3. The control circuit for an air bag type vibration damping buffer mechanism of a treadmill of claim 2, wherein: the single chip microcomputer is internally provided with a storage medium, the single chip microcomputer is internally provided with a storage medium for storing running gesture monitoring algorithm software code modules, and the storage medium comprises a running flight time length algorithm module, a running ground contact time length module, a left-right balance proportion algorithm module, a running step number step frequency algorithm module and a stride algorithm module which relate to foot landing and body swing gestures.
4. A control method of an air bag type vibration reduction buffer mechanism of a running machine is characterized in that: the method comprises the following steps:
s1, under normal standby or normal operation of the running machine, a control system outputs a preset level signal, and a running machine main system does not trigger actions;
s2, judging whether the running machine is normal or not by detecting an electric signal of an air bag air pressure sensor;
s3, when the air bag air pressure sensor senses an electric signal of low air pressure, the running machine stops.
5. The method for controlling an air bag type vibration damping buffer mechanism of a running machine according to claim 4, wherein: the specific steps of the step S1 are as follows: under the condition that the running machine stands by or a user runs, the air pressure of the air bag changes along with the rise and fall of the footsteps, and the control system outputs a preset level signal, so that the action of the running machine main system can not be triggered.
6. The method for controlling an air bag type vibration damping buffer mechanism of a running machine according to claim 4, wherein: the specific steps of step S2 and step S3 are as follows: when the impact force of the falling footstep caused by a user exceeds the upper limit of the air bag or the air bag is damaged, the air pressure of the corresponding air bag is rapidly reduced, the left air bag air pressure sensor or the right air bag air pressure sensor senses an electric signal with very low air pressure, the corresponding electric signal triggers the corresponding air pressure electric signal amplifier to output a reverse level signal, the reverse level signal is input to the control system, the control system outputs the reverse level signal, the power supply of the main motor driving circuit of the running machine is triggered to be closed, the running belt is stopped, and the user is ensured not to be thrown out and injured by the running belt.
7. The method for controlling an air bag type vibration damping buffer mechanism of a running machine according to claim 6, wherein: in the step S2, whether the running machine is normal is detected through a built-in storage medium of the singlechip, the built-in storage medium of the singlechip stores a running mode monitoring algorithm software code module, and the running mode monitoring algorithm software code module judges the mode of the running according to the left air bag air pressure value and the right air bag air pressure value change waveform corresponding to the process acquired when the left foot and the right foot are grounded, wherein the mode of the running is three modes of front sole grounding, full sole grounding and heel grounding.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118320369A (en) * | 2024-05-10 | 2024-07-12 | 舒华体育股份有限公司 | Treadmill shock absorption method and treadmill with shock absorption air bag |
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