Portable fitness force arm training machine

Abstract

The invention provides a portable fitness force arm training machine, and relates to the technical field of fitness equipment. The training machine comprises a base, a stand column, a force arm and a training pull rope sequentially penetrating into the force arm and the stand column, a first electric adjusting unit is installed on the stand column and the base, and the stand column and the force arm are folded or unfolded on the base through the first electric adjusting unit; the second electric adjusting unit is installed between the stand column and the rotating base, and the rotating base is driven by the second electric adjusting unit and drives the power arm to rotate in the horizontal plane. The third electric adjusting unit is installed between the rotating base and the force arm, and the first end of the force arm is driven by the third electric adjusting unit and drives the force arm to rotate in the vertical plane. The load electric adjusting unit is installed on the stand column, the training pull rope penetrates through the load electric adjusting unit, and the training load is adjusted through the load electric adjusting unit. The whole device has the functions of convenient storage and unfolding, the portability is improved, various training angles are provided, and the user experience is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of fitness equipment, in particular to a portable fitness arm training machine. Background Art

[0002] With the improvement of living standards, people pay more and more attention to and pursue body shaping; fitness equipment is often divided into two categories according to the number of training functions: single-function and comprehensive multi-function. Commonly used ones include rowing machines, fitness bikes, walking machines, treadmills, waist beautification machines, etc. However, existing training equipment in gyms, such as upper limb training machines, are bulky and take up space when unfolded, and the training mode is relatively single, which is time-consuming and laborious to install.

[0003] Therefore, there is an urgent need for a lightweight fitness arm training machine that can be flexibly and easily stored or unfolded, saves space, and brings a better experience to users. Summary of the invention

[0004] The purpose of the present invention is to provide a portable fitness arm training machine, which solves the technical problems of bulky volume, space occupation and inconvenience in use in the prior art. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a portable fitness arm training machine, comprising a base, a column slidably connected to the base, a force arm rotatably connected to the column via a rotating seat, and a training pull rope sequentially inserted into the force arm and the column, and further comprising:

[0007] A first electric adjustment unit, wherein the first electric adjustment unit is installed on the column and the base, and the column and the lever arm are stored or unfolded on the base through the first electric adjustment unit;

[0008] A second electric adjustment unit, wherein the second electric adjustment unit is installed between the column and the rotating seat, and the rotating seat is driven by the second electric adjustment unit and drives the force arm to rotate in a horizontal plane;

[0009] a third electric adjustment unit, wherein the third electric adjustment unit is installed between the rotating seat and the lever arm, and the first end of the lever arm is driven by the third electric adjustment unit to drive the lever arm to rotate in a vertical plane;

[0010] A load electric adjustment unit is installed on the column, the training pull rope passes through the load electric adjustment unit, and the training load is adjusted through the load electric adjustment unit.

[0011] Preferably, the first electric adjustment unit comprises:

[0012] A first slider, the first slider is slidably connected to the base along the length direction of the base and is rotatably connected to the first end of the column;

[0013] A first electric drive component is installed between the first slider and the base, and the first electric drive component drives the first slider to slide on the base and drives the column and the first slider to rotate.

[0014] Preferably, the first electric drive assembly comprises:

[0015] a third motor, wherein the third motor is fixedly connected to the first sliding block;

[0016] A rack is fixedly connected to the storage cavity of the base along the length direction of the base, and the output shaft of the third motor is meshed with the rack through a third gear.

[0017] Preferably, the first electric drive assembly further includes:

[0018] A fourth gear, the fourth gear being coaxially fixedly connected to the rotating shaft at the first end of the column;

[0019] The second rack is fixedly connected to the base along the sliding direction of the first slider. When the column is in the unfolded state, the fourth gear is meshed with the second rack.

[0020] Preferably, the first electric drive assembly further includes:

[0021] A positioning pin, the positioning pin is inserted into the first slider and the first end of the column in sequence;

[0022] A plurality of positioning grooves are circumferentially arranged at the first end of the column, and the positioning pin extends into a group of the positioning grooves.

[0023] Preferably, the second electric adjustment unit comprises:

[0024] A second motor is fixedly connected in the rotating seat, the rotating seat and the column are driven by the second motor, the first end of the rotating seat is rotatably connected to the second end of the column, and the first end of the force arm is rotatably connected to the second end of the rotating seat.

[0025] Preferably, the second electric adjustment unit further includes:

[0026] A second gear, the second gear is coaxially fixedly connected to the output shaft of the second motor;

[0027] An inner gear ring is fixedly connected to the second end of the column, and the second gear is meshed with the inner side of the inner gear ring.

[0028] Preferably, the third electric adjustment unit includes:

[0029] A first motor, wherein the first motor is fixedly connected to the lever arm;

[0030] A synchronous block is fixedly connected to the output shaft of the first motor and embedded in the rotating seat.

[0031] Preferably, the load electric adjustment unit comprises:

[0032] A torque motor, the torque motor is fixedly connected in the column;

[0033] A wire loop is fixedly connected to the torque output end of the torque motor, and the first end of the training rope passes through the wire loop and is fixedly connected to the second end of the column.

[0034] Preferably, the load electric adjustment unit further includes:

[0035] A first knob and a second knob, wherein the first knob and the second knob are respectively mounted on the torque motor, the torque motor adjusts the output torque through the first knob, and the torque motor adjusts the recovery torque through the second knob.

[0036] In the technical solution provided by the present invention, the main function of the second electric adjustment unit is, on the one hand, to adjust the angle of the lever arm in the horizontal plane and the angle in the vertical plane, to provide different training angles, suitable for different users, and on the other hand, to fold the column and the lever arm; the main function of the first electric adjustment unit is to store the folded column and the lever arm into the base or extend them out from the base; the main function of the load electric adjustment unit is to adjust the load during the training process, suitable for different users; among them, the first electric adjustment unit, the second electric adjustment unit and the load electric adjustment unit all involve power-on drive, which effectively reduces the user's physical strength, and can be easily stored and unfolded as a whole, thereby improving portability, and also providing more training angles, bringing a better experience to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 is a schematic cross-sectional view of the first electric adjustment unit and the second electric adjustment unit of the present invention in the main viewing direction;

[0040] Figure 3 yes Figure 2 A is a local enlarged schematic diagram;

[0041] Figure 4 yes Figure 2 A local enlarged schematic diagram of B in FIG.

[0042] Figure 5 It is a schematic diagram of the positioning pin and the positioning groove of the present invention;

[0043] Figure 6 yes Figure 5 A local enlarged schematic diagram of C in FIG.

[0044] Figure 7 It is a schematic diagram of the clamping block and the first sliding block of the present invention;

[0045] Figure 8 It is a schematic diagram of the fourth gear and the second rack of the present invention.

[0046] In the figure, 1-base; 2-column; 3-first slider; 4-locating pin; 5-torque motor; 6-first knob; 7-second knob; 8-wire ring; 9-training rope; 10-rotating seat; 11-first motor; 12-force arm; 13-handle; 14-block; 15-synchronizing block; 16-locking rope; 17-handle slider; 18-second motor; 19-third motor; 20-third gear; 21-first rack; 22-fourth gear; 23-locating groove; 24-second gear; 25-inner gear ring; 26-fixing block; 27-second spring; 28-storage cavity; 29-second rack. DETAILED DESCRIPTION

[0047] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0048] refer to Figure 1-8 The specific embodiment of the present invention provides a portable fitness arm training machine, comprising a base 1, a column 2 slidably connected to the base 1, a force arm 12 rotatably connected to the column 2 through a rotating seat 10, and a training pull rope 9 sequentially inserted into the force arm 12 and the column 2, and also includes:

[0049] A first electric adjustment unit, the first electric adjustment unit is installed on the column 2 and the base 1, and the column 2 and the arm 12 are stored or unfolded on the base 1 through the first electric adjustment unit;

[0050] A second electric adjustment unit is installed between the column 2 and the rotating seat 10. The rotating seat 10 is driven by the second electric adjustment unit and drives the power arm 12 to rotate in a horizontal plane;

[0051] A third electric adjustment unit, which is installed between the rotating seat 10 and the force arm 12. The first end of the force arm 12 is driven by the third electric adjustment unit and drives the force arm 12 to rotate in a vertical plane;

[0052] The load electric adjustment unit is installed on the column 2, the training rope 9 passes through the load electric adjustment unit, and the training load is adjusted through the load electric adjustment unit.

[0053] Existing training equipment in gyms, such as upper limb training machines, are large in size and space-consuming when unfolded, and the training mode is relatively simple, which is time-consuming and laborious during installation. In the present application, the main function of the second electric adjustment unit is to adjust the angle of the lever arm 12 in the horizontal plane; the main function of the third electric adjustment unit is to adjust the angle of the lever arm 12 in the vertical plane, provide different training angles, and be suitable for different users. The third electric adjustment unit folds the column 2 and the lever arm 12; the main function of the first electric adjustment unit is to store the folded column 2 and the lever arm 12 into the base 1 or extend them from the base 1 to unfold; the main function of the load electric adjustment unit is to adjust the load during the training process, which is suitable for different users; among them, the first electric adjustment unit, the second electric adjustment unit, the third electric adjustment unit and the load electric adjustment unit all involve power-on drive, which effectively reduces the user's physical strength, and can be easily stored and unfolded as a whole, improve portability, and provide more training angles, bringing a better experience to the user.

[0054] Further optimizing the scheme, the first electric adjustment unit includes:

[0055] A first sliding block 3, which is slidably connected to the base 1 along the length direction of the base 1 and is rotatably connected to the first end of the column 2;

[0056] The first electric drive component is installed between the first slider 3 and the base 1. The first electric drive component drives the first slider 3 to slide on the base 1 and drives the column 2 and the first slider 3 to rotate.

[0057] When in the stowed state, the first slider 3, the column 2 and the lever arm 12 are all located inside the base 1; when it is necessary to adjust to the unfolded state, the column 2 and the lever arm 12 in the folded state are electrically driven by the first electric drive assembly to slide out of the base 1, and then the column 2 and the lever arm 12 in the folded state are rotated 90° to be adjusted to the erected state, that is, the column 2 is perpendicular to the base 1, and finally the horizontal angle between the column 2 and the rotating seat 10 and the vertical angle between the rotating seat 10 and the lever arm 12 are adjusted.

[0058] Further optimizing the solution, the first electric drive component includes:

[0059] A third motor 19, the third motor 19 is fixedly connected to the first slider 3;

[0060] The rack 21 is fixedly connected in the receiving cavity 28 of the base 1 along the length direction of the base 1 , and the output shaft of the third motor 19 is meshed with the rack 21 through the third gear 20 .

[0061] When the column 2 is in a horizontal state, the third motor 19 is powered on and started, and the rack 21 is engaged with the third gear 20 to drive the first slider 3, the column 2 in the folded state and the lever arm 12 to slide, so that the column 2 and the lever arm 12 in the folded state can be stored in the storage cavity 28 of the base 1 or slide out of the storage cavity 28 of the base 1.

[0062] Further optimizing the solution, the first electric drive component also includes:

[0063] The fourth gear 22 is coaxially fixedly connected to the rotating shaft of the first end of the column 2; the fourth gear 22 drives the column 2 to rotate upward 90°;

[0064] The second rack 29 is fixedly connected to the base 1 along the sliding direction of the first slider 3. When the column 2 is in the unfolded state, the fourth gear 22 is meshed with the second rack 29.

[0065] In the stowed state, the fourth gear 22 is separated from the second rack 29 and is not meshed, and the column 2 is in a horizontal state; during the adjustment process from the stowed state to the unfolded state, the first slider 3 gradually approaches the exit of the storage cavity 28 ( Figure 1 The folded column 2 and the force arm 12 continuously extend out of the storage cavity 28 from the exit until the fourth gear 22 contacts and meshes with the second rack 29. During the continuous movement of the first slider 3, the fourth gear 22 rotates, synchronously driving the column 2 to flip upward. When the first slider 3 moves to the specified position, the travel switch in the base 1 is triggered (not shown in the figure), the third motor 19 stops, and the first slider 3 stops moving. At this time, the column 2 is in a vertical state.

[0066] Further optimizing the solution, the first electric drive component also includes:

[0067] The positioning pin 4 is inserted into the first end of the first slider 3 and the first end of the column 2 in sequence;

[0068] Positioning grooves 23 , a plurality of positioning grooves 23 are circumferentially arranged at the first end of the column 2 , and the positioning pins 4 extend into a group of positioning grooves 23 .

[0069] In the stored state, the column 2 is horizontal, the locating pin 4 is inserted into the corresponding locating groove 23, and the column 2 cannot rotate; when the column 2 needs to be unfolded and the column 2 extends out of the storage cavity 28 (the fourth gear 22 and the second rack 29 are not engaged), the locating pin 4 is first manually pulled out to disengage the locating pin 4 from the locating groove 23, and the column 2 can rotate. At this time, the first slider 3 is continued to be driven until the column 2 is adjusted to a vertical state, and the locating pin 4 is inserted into the locating groove 23; the main function of the locating pin 4 is to ensure the state of the column 2 when it is stored or unfolded to prevent accidents as a safety measure.

[0070] Further optimizing the solution, the second electric adjustment unit includes:

[0071] The second motor 18 is fixedly connected in the rotating seat 10 , and the rotating seat 10 and the column 2 are driven by the second motor 18 . The first end of the rotating seat 10 is rotatably connected to the second end of the column 2 , and the first end of the force arm 12 is rotatably connected to the second end of the rotating seat 10 .

[0072] Start the second motor 18, the rotating seat 10 and the column 2 begin to rotate, rotate in the horizontal direction, and turn off the second motor 18 after rotating to the specified position; wherein, the adjustment of the horizontal angle of the lever arm 12 is through electric drive, which is labor-saving and convenient.

[0073] Further optimizing the solution, the second electric adjustment unit also includes:

[0074] A second gear 24, the second gear 24 is coaxially fixedly connected to the output shaft of the second motor 18;

[0075] The inner gear ring 25 is fixedly connected to the second end of the column 2 , and the second gear 24 is meshed with the inner side of the inner gear ring 25 .

[0076] The rotating seat 10 and the column 2 are connected by the second gear 24 and the inner gear ring 25.

[0077] Further optimizing the scheme, the third electric adjustment unit includes:

[0078] A first motor 11, the first motor 11 is fixedly connected to the lever arm 12;

[0079] The synchronous block 15 is fixedly connected to the output shaft of the first motor 11 and embedded in the rotating seat 10 . The first motor 11 rotates synchronously with the force arm 12 .

[0080] Start the first motor 11, the lever arm 12 starts to rotate around the rotating seat 10, and the first motor 11 is turned off after the lever arm 12 rotates to a specified height; between the rotating seat 10 and the lever arm 12, the first motor 11 drives the synchronization block 15, and the first motor 11 and the lever arm 12 rotate synchronously to realize the rotation of the rotating seat 10 and the lever arm 12; wherein, the pitch angle adjustment of the lever arm 12 is through electric drive, which is labor-saving and convenient.

[0081] To further optimize the solution, the load electric adjustment unit includes:

[0082] The torque motor 5 is fixedly connected in the column 2;

[0083] The wire loop 8 is fixedly connected to the torque output end of the torque motor 5 , and the first end of the training rope 9 passes through the wire loop 8 and is fixedly connected to the second end of the column 2 .

[0084] A flexible steel wire rope is wound around the output shaft of the torque motor 5, and the movable end of the steel wire rope is fixedly connected to the wire loop 8. When the training pull rope 9 is pulled, the wire loop 8 produces a vertical displacement, and the torque of the torque motor 5 is used as a training load, thereby achieving the effect of muscle training; the structure formed between the wire loop 8 and the training pull rope 9 is similar to that of a movable pulley, achieving the effect of double stretching distance.

[0085] To further optimize the solution, the load electric adjustment unit also includes:

[0086] The first knob 6 and the second knob 7 are respectively installed on the torque motor 5. The torque motor 5 adjusts the output torque, that is, the training load, through the first knob 6. The torque motor 5 adjusts the recovery torque, that is, the pulling force required when the flexible steel wire rope is retracted, through the second knob 7.

[0087] Further optimization plans also include:

[0088] A handle slider 17, the handle slider 17 is slidably connected to the bottom of the entrance and exit of the receiving cavity 28 in the base 1;

[0089] A fixing block 26, wherein a plurality of fixing blocks 26 are fixedly connected to the four corners of the bottom of the receiving chamber 28;

[0090] The card block 14 is slidably connected between the fixed block 26 and the bottom of the storage cavity 28, and is arranged corresponding to the first slider 3. All the card blocks 14 are fixedly connected to the handle slider 17 through the locking rope 16;

[0091] The second spring 27 is abutted between a side of the clamping block 14 close to the locking rope 16 and the fixing block 26 .

[0092] When in the storage state, the block 14 limits the first slider 3 in the storage chamber 28, and the first slider 3 cannot be driven by the third motor 19; manually pull the handle slider 17, and pull all the blocks 14 into the fixed block 26 by locking the pull rope 16, and overcome the elastic force of the second spring 27; when the first slider 3 is driven by the third motor 19 and moves away from the block 14, release the hand until the first slider 3 slides to the exit, the first slider 3 squeezes the inclined surface of the block 14 at the exit, and presses the block 14 into the fixed block 26. When the first slider 3 moves to the specified position, the first slider 3 passes through and separates from the block 14, and the block 14 pops out under the elastic force of the second spring 27. At this time, the first slider 3 is limited and cannot slide into the storage chamber 28. The handle slider 17 needs to be manually pulled to release the limiting effect of the block 14; wherein, the main function of the block 14 is to ensure the position of the first slider 3 when in the storage or unfolded state to prevent the first slider 3 from accidentally moving.

[0093] Further optimization plans also include:

[0094] The handle 13 is fixedly connected to the second end of the training pull rope 9 and is arranged corresponding to the second end of the lever arm 12.

[0095] The muscle training is performed by pulling the training rope 9 through the handle 13. A tension sensor is installed on the second end of the training rope 9 to detect the values ​​of the tension and the retraction force, so as to evaluate the stability of the continuous force of the muscle during the exercise and record the number of stretching and retraction.

[0096] To further optimize the solution, all motors in this application are servo motors.

[0097] It should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. used herein to indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0098] In the description of this article, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0099] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A light-weight fitness arm training machine, comprising a base (1), a column (2) slidably connected to the base (1), a force arm (12) rotatably connected to the column (2) via a rotating seat (10), and a training pull rope (9) sequentially inserted into the force arm (12) and the column (2), characterized in that: Also includes: A first electric adjustment unit, the first electric adjustment unit being mounted on the column (2) and the base (1), the column (2) and the lever arm (12) being stored or unfolded on the base (1) through the first electric adjustment unit; A second electric adjustment unit, the second electric adjustment unit being installed between the column (2) and the rotating seat (10), the rotating seat (10) being driven by the second electric adjustment unit and driving the lever arm (12) to rotate in a horizontal plane; a third electric adjustment unit, the third electric adjustment unit being installed between the rotating seat (10) and the lever arm (12), the first end of the lever arm (12) being driven by the third electric adjustment unit and driving the lever arm (12) to rotate in a vertical plane; A load electric adjustment unit is installed on the column (2), the training pull rope (9) passes through the load electric adjustment unit, and the training load is adjusted through the load electric adjustment unit.

2. The portable fitness arm training machine according to claim 1, characterized in that: The first electric adjustment unit comprises: A first sliding block (3), the first sliding block (3) being slidably connected to the base (1) along the length direction of the base (1) and being rotatably connected to the first end of the column (2); A first electric drive component is installed between the first slider (3) and the base (1), and the first electric drive component drives the first slider (3) to slide on the base (1) and drives the column (2) and the first slider (3) to rotate.

3. The portable fitness arm training machine according to claim 2, characterized in that: The first electric drive assembly comprises: a third motor (19), the third motor (19) being fixedly connected to the first slider (3); A rack (21), wherein the rack (21) is fixedly connected in a storage cavity (28) of the base (1) along the length direction of the base (1), and the output shaft of the third motor (19) is meshed with the rack (21) via a third gear (20).

4. The portable fitness arm training machine according to claim 2, characterized in that: The first electric drive assembly also includes: A fourth gear (22), the fourth gear (22) being coaxially fixedly connected to the rotating shaft at the first end of the column (2); A second rack (29), wherein the second rack (29) is fixedly connected to the base (1) along the sliding direction of the first slider (3); when the column (2) is in an unfolded state, the fourth gear (22) is meshed with the second rack (29).

5. The portable fitness arm training machine according to claim 4, characterized in that: The first electric drive assembly also includes: A positioning pin (4), the positioning pin (4) being inserted into the first end of the first slider (3) and the first end of the column (2) in sequence; Positioning grooves (23), a plurality of the positioning grooves (23) are circumferentially arranged at the first end of the column (2), and the positioning pin (4) extends into a group of the positioning grooves (23).

6. The portable fitness arm training machine according to claim 1, characterized in that: The second electric adjustment unit comprises: A second motor (18), wherein the second motor (18) is fixedly connected to the rotating seat (10), the rotating seat (10) and the column (2) are driven by the second motor (18), the first end of the rotating seat (10) is rotatably connected to the second end of the column (2), and the first end of the force arm (12) is rotatably connected to the second end of the rotating seat (10).

7. The portable fitness arm training machine according to claim 6, characterized in that: The second electric adjustment unit also includes: a second gear (24), the second gear (24) being coaxially fixedly connected to an output shaft of the second motor (18); An inner gear ring (25), the inner gear ring (25) is fixedly connected to the second end of the column (2), and the second gear (24) is meshed on the inner side of the inner gear ring (25).

8. The portable fitness arm training machine according to claim 6, characterized in that: The third electric adjustment unit comprises: A first motor (11), wherein the first motor (11) is fixedly connected to the lever arm (12); A synchronous block (15), the synchronous block (15) is fixedly connected to the output shaft of the first motor (11) and embedded in the rotating seat (10).

9. The portable fitness arm training machine according to claim 1, characterized in that: The load electric adjustment unit comprises: A torque motor (5), wherein the torque motor (5) is fixedly connected inside the column (2); A wire loop (8), wherein the wire loop (8) is fixedly connected to the torque output end of the torque motor (5), and the first end of the training pull rope (9) passes through the wire loop (8) and is fixedly connected to the second end of the column (2).

10. The portable fitness arm training machine according to claim 9, characterized in that: The load electric adjustment unit also includes: A first knob (6) and a second knob (7), wherein the first knob (6) and the second knob (7) are respectively mounted on the torque motor (5), the torque motor (5) adjusts the output torque through the first knob (6), and the torque motor (5) adjusts the recovery torque through the second knob (7).

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