Stepless amplitude transmission mechanism and fascia gun

Abstract

The present invention discloses a stepless variable amplitude transmission mechanism in the field of fascia guns, including a crank slider mechanism composed of a crank, a connecting rod and a slider hinged in sequence, and an angle adjustment mechanism, wherein the angle adjustment mechanism includes a crank fixing member and a slider guide hinged to each other, the hinge axis of the crank fixing member and the slider guide being parallel to but not coaxial with the axis of the rotation center of the crank, the rotation center of the crank being fixed on the crank fixing member, and the slider being slidably arranged on the slider guide. The present invention adds an angle adjustment mechanism to the traditional centring crank slider mechanism, and uses the angle adjustment mechanism to change the distance from the rotation center of the crank to the guide centerline of the slider, thereby forming an offset crank slider mechanism with an adjustable offset distance, thereby adjusting the slider amplitude while changing the slider movement angle. The entire mechanism has a simple structure, the slider movement angle and amplitude are easy to adjust, and the mechanism operates stably and reliably.

Description

Technical Field

[0001] The present invention relates to the field of fascia guns, and in particular to a stepless amplitude-variable transmission mechanism and a fascia gun. Background Art

[0002] A fascia gun, also known as a deep myofascial impactor, is a soft tissue massage tool that relaxes the body's soft tissues through high-frequency impacts. Existing fascia guns use a piston to drive a massage head in a linear reciprocating motion. The massage head contacts the body, generating high-frequency vibrations that act deep into the muscles, reducing local tissue tension, relieving pain, and promoting blood circulation.

[0003] To facilitate massaging different parts of the body, a type of massage gun with a rotatable massage head has been developed. For example, the adjustable-angle massage gun, published as CN217660684U, comprises a main body housing, a steering head, and a motor assembly. The steering head is rotatably mounted on the main body housing, while the motor assembly is integrated within the steering head and mounted on the main body housing. When the steering head rotates relative to the main body housing, the reciprocating mechanism connecting the motor and massage head rotates synchronously, thereby adjusting the massage angle.

[0004] To achieve varying depths of massage, some massage guns with adjustable vibration head amplitudes have also appeared on the market. For example, patent publication number CN116155027A offers a solution for adjusting the amplitude by adjusting the position of the joystick; patent publication number US2022047453A1 offers a solution for varying the amplitude by changing the crank length; and patent publication number CN219763905U uses a voice coil motor to drive the massage head and adjust the amplitude. These variable-amplitude massage guns allow users to choose the appropriate amplitude depth for massage therapy. For example, professional athletes require a deeper amplitude depth to achieve post-exercise muscle relief. However, ordinary consumers, especially beginners, should initially use a lighter amplitude depth and then gradually increase the amplitude as needed.

[0005] Current variable-amplitude massage guns each have their advantages, but they also have some drawbacks. The solution with publication number CN116155027A is complex, occupies more space within the housing, and is costly. The solution with publication number US2022047453A1 has only two adjustment positions and a narrow amplitude adjustment range. The solution with publication number CN219763905U has low structural reliability and limited impact force. Furthermore, the addition of an amplitude adjustment mechanism complicates the structure of current variable-amplitude massage guns on the market, resulting in a lack of a solution that can simultaneously adjust both the massage angle and amplitude. Summary of the Invention

[0006] In order to overcome the above-mentioned deficiencies of the existing variable amplitude fascia gun, the technical problem to be solved by the present invention is to provide a stepless amplitude transmission mechanism and a fascia gun with a simple structure and convenient adjustment.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] In the first aspect, the present invention provides a stepless variable amplitude transmission mechanism, including a crank slider mechanism composed of a crank, a connecting rod and a slider hinged in sequence, and also including an angle adjustment mechanism, the angle adjustment mechanism including a crank fixing part and a slider guide part hinged to each other, the hinge axis of the crank fixing part and the slider guide part is parallel to the axis of the rotation center of the crank but not coaxial, the rotation center of the crank is fixed on the crank fixing part, and the slider is slidably arranged on the slider guide part.

[0009] The adjustment principle of this transmission mechanism is to rotate the crank fixing part or the slider guide part to make the rotation center of the crank deviate from the guide center line of the slider, thereby transforming the traditional concentric crank slider mechanism into an offset crank slider mechanism with adjustable offset distance. When the offset distance changes, the sliding range of the slider on its guide center line will change, which will lead to a change in amplitude.

[0010] Because the offset distance varies depending on the rotation angle between the crank fixture and the slider guide, the offset distance can be more accurately calculated by setting the hinge axis of the crank fixture and the slider guide to intersect the centerline of the slider's reciprocating path. This allows the offset distance to be directly calculated based on the rotation angle using trigonometric functions.

[0011] In addition, when applying the transmission mechanism to the specific structure of the fascia gun, the stability of the structure must also be considered. Therefore, the optimal solution is that the hinge center of the crank fixing and the slider guide is located on the center line of the guide path of the reciprocating motion of the slider.

[0012] Based on the two rotation schemes described above, assuming that when the angle between the crank fixture and the slider guide is 0° or 180°, the crank's rotation center is located on the slider's guide centerline, and the offset distance is 0. When the crank fixture rotates 90° relative to the slider guide, the crank's rotation center is at its maximum distance from the slider's guide centerline, and the offset distance is at its maximum. Therefore, to avoid repeated adjustments, the rotatable angle range between the crank fixture and the slider guide is controlled within 0-90°, that is, the maximum rotation angle is within 0-90°.

[0013] Of course, in order for the crank slider mechanism to meet the operating conditions, it is necessary to ensure that when the crank fixing member and the slider guide member are at the maximum angle position, the distance from the crank's rotation center to the slider's guide path center line is still less than the difference in rod length between the connecting rod and the crank.

[0014] Furthermore, a locking mechanism is included, connected between the crank fixture and the slider guide, to secure the relative positions of the crank fixture and the slider guide. Once the amplitude is adjusted to a suitable value, the locking mechanism can be used to secure the crank fixture and the slider guide to prevent amplitude changes during operation.

[0015] In a second aspect, the present invention further provides a fascia massage gun, comprising a housing, a motor located within the housing, a massage head, and a reciprocating motion mechanism connected between the motor and the massage head, wherein the reciprocating motion mechanism is the above-mentioned stepless amplitude transmission mechanism, wherein the crank is an eccentric wheel connected to the motor main shaft, the slider is a piston rod for connecting the massage head, and the connecting rod is a transmission arm hinged between the eccentric wheel and the piston rod. The crank fixing member and / or the slider guide are rotatably arranged within the housing via a hinge axis therebetween, the motor is fixed to the crank fixing member, and the piston rod is slidably connected to a piston sleeve on the slider guide. During use, the distance between the motor main shaft and the reciprocating motion axis of the piston rod can be changed by rotating the crank fixing member or the slider guide member alone, or by rotating the crank fixing member and the slider guide member simultaneously, thereby adjusting the offset distance of the crank slider mechanism to achieve the purpose of changing the amplitude of the massage head.

[0016] Since the above-mentioned solution places both the crank fixture and the slider guide within the housing, it takes up a significant amount of housing space, hindering device miniaturization. Therefore, a preferred solution is one in which the housing includes a main housing and a steering head that are rotatably connected. The crank fixture serves as the main housing housing that secures the motor, and the slider guide serves as the steering head with a piston sleeve. The rotational axis between the main housing and the steering head serves as the articulated axis connecting the crank fixture and the slider guide. This utilizes the external rotational connection between the steering head and the main housing to adjust the distance between the motor and the centerline of the piston rod guide without occupying space within the housing. When using the fascia gun, the user can adjust the massage angle by rotating the steering head. Simultaneously, the reciprocating centerlines of the motor's main shaft and the piston rod deviate, causing the amplitude of the massage head to change accordingly. Therefore, the fascia gun can simultaneously adjust the massage angle and the amplitude of the massage head, thereby meeting various massage needs and enhancing the massage effect. Furthermore, the overall structure is simple and reliable, and the massage angle and amplitude can be easily adjusted, facilitating precise control of the amplitude.

[0017] Specifically, as to the installation method of the steering head and the main engine housing, the head of the steering head is the front nozzle of the steering head, and the tail is the rotating fitting part. The rotating fitting part is rotatably connected to the steering head cover of the main engine housing. The axis of the rotating fitting part is perpendicularly intersected with the axis of the piston sleeve in the steering head. A mounting cavity is provided in the rotating fitting part, and a motor bracket is suspended inside the mounting cavity. The motor bracket is fixed to the steering head cover by a connecting structure passing through a giveway hole at one end of the rotating fitting part. The main shaft of the motor mounted on the motor bracket is parallel to the axis of the rotating fitting part but not coaxial.

[0018] The rotating mating part is designed so that its axis intersects perpendicularly with the axis of the piston sleeve in the steering head. This ensures that the steering head's center of rotation is aligned with the centerline of the piston rod's guide, facilitating adjustment and control of the amplitude. A mounting cavity is provided within the rotating mating part to accommodate the motor, ensuring that the steering head does not interfere with the motor during rotation while allowing space for the eccentric wheel and transmission arm to move. Suspending the motor bracket within the mounting cavity prevents vibrations generated by the motor from being transmitted to the steering head, preventing any vibration or noise from the steering head, thus achieving a more effective fixation.

[0019] Furthermore, each end of the rotating mating portion is provided with a circular aperture. Two circular bosses are provided within the steering head housing, each rotatably mating with the respective apertures. The steering head housing is also provided with heat dissipation holes corresponding to the apertures. The mating of the holes and bosses creates a rotational connection, ensuring a secure connection between the steering head and the main engine housing. The heat dissipation holes are positioned opposite each other, facilitating air convection and improving heat dissipation from the motor.

[0020] To limit the steering head's rotational range, a clearance chute is provided on the steering head housing, through which the steering head's front nozzle passes and moves. Since the offset distance in the transmission mechanism reaches its maximum when the steering head rotates 90° relative to the main body housing, starting from the motor's main shaft being located on the guide centerline of the piston rod, the clearance chute can limit the steering head's rotation within a range of 0-90°. The clearance chute can be configured so that when the steering head is at the 0° position, i.e., when the steering head's front nozzle contacts one end of the clearance chute, the motor's main shaft intersects the axis of the piston sleeve. According to this structure, when the steering head is at the 0° position, the transmission mechanism's offset distance is 0, and the massage head's amplitude is minimal. When the steering head rotates to the 90° position, the transmission mechanism's offset distance is the distance from the motor's main shaft to the main shaft of the rotating mating portion, and the massage head's amplitude is maximum.

[0021] The present invention provides three solutions for the connection structure between the motor bracket and the steering head cover.

[0022] Solution 1: The connecting structure includes a connecting rod mounted on the motor bracket, the connecting end of which passes through the mounting cavity through the clearance hole and is connected to the steering head cover. The connecting structure formed by the connecting rod has a simple structure and is easy to manufacture and install.

[0023] Solution 2: The connection structure includes a motor connection portion mounted on the steering head housing. The motor connection portion extends through a clearance hole into the mounting cavity and connects to the motor bracket. This connection structure not only strengthens the steering head housing but also facilitates rotational connection and improves the stability of the rotational engagement portion with the steering head housing, thereby extending the service life of the fascia gun.

[0024] Solution 3: The connection structure includes a connecting rod mounted on the motor bracket and a motor connection portion mounted on the steering head housing. The motor connection portion extends through the clearance hole into the mounting cavity, and the connecting end of the connecting rod is connected to the motor connection portion. This connection structure, formed by the connecting rod and the motor connection portion, combines the aforementioned advantages with only a slight increase in structural complexity and low cost.

[0025] In order to improve the connection strength, there are at least two connecting rods, and a wall is provided between any two adjacent connecting rods. The wall can form the connecting rod into a whole, increase its structural strength, and improve the stability of the motor installation. A pillow block is provided at the connecting end of the connecting rod, and the pillow block is provided with an anti-vibration sleeve that abuts the steering head cover. The connecting rod and the anti-vibration sleeve can be fixed to the steering head cover by screws, and the anti-vibration sleeve abuts the fascia gun housing, so that the vibration transmitted to the connecting rod by the motor can be buffered by the anti-vibration sleeve, reducing the vibration transmitted to the main body housing and avoiding abnormal noise caused by vibration, collision, etc.

[0026] In order to facilitate holding the fascia gun, the main body shell also includes a first handle, a third handle, a second handle and a control handle connected in sequence, and the axis of the first handle, the axis of the third handle, the axis of the second handle and the axis of the control handle form a parallelogram; the steering head cover is arranged at the intersection of the first handle and the control handle; the connection between the first handle and the third handle, the connection between the second handle and the third handle, and the connection between the second handle and the control handle are all smooth transition connections.

[0027] The parallelogram-shaped handle ensures that when the steering head is rotated to various angles, the center of gravity of the entire fascia gun can be kept coincident with the axis of the impact force as much as possible, and there are multiple handles to choose from, which is conducive to ensuring that the axis of the impact force is as perpendicular as possible to the holding direction, thereby reducing the lateral reaction force and avoiding loose grip; the lateral reaction force generally refers to the reaction force parallel to the user's holding direction. Usually, the reaction force is perpendicular to the user's holding direction to ensure that the user holds the handle tightly, and is conducive to the user's force application, thereby improving the massage effect.

[0028] Furthermore, the angle between the axis of the second handle and the axis of the third handle is 30° to 80°, and the relative obtuse angle is 100° to 150°. This angle range, combined with appropriate chamfers for transition, can meet the needs of palm grip to improve grip comfort and further ensure that after grasping adjacent handles, the thumb, index finger, or pinky finger can be placed on the adjacent handle for support. In order to adapt the handle to the amplitude adjustment angle, it can be set so that when the steering head is in the 0° position, the axis of the piston sleeve is perpendicular to the axis of the first handle.

[0029] In order to achieve the control of the fascia gun, the fascia gun also includes a control component, which includes a main control board and a battery. The main control board is located in the second handle, and the battery is located in the first handle and the third handle, and the motor and the battery are electrically connected to the main control board respectively; the third handle is provided with a charging interface, and the charging interface is electrically connected to the main control board; the control handle is provided with a display screen, a power switch and a power button, and the display screen is electrically connected to the main control board. The power switch is arranged in the control handle and electrically connected to the main control board, and the power button is arranged on the control handle and corresponds to the power switch.

[0030] Furthermore, in order to fix the steering head after adjusting the angle of the steering head and the amplitude of the massage head, the fascia gun also includes a steering head locking assembly, which includes a card hole, a movable bracket, an elastic member and an unlocking button;

[0031] The clamping holes are formed on the outer edge of the rotating fitting portion, and there are at least two clamping holes that are spaced apart and distributed along the rotation direction of the rotating fitting portion;

[0032] The movable bracket is movably installed in the control handle, and a rotation-stopping portion is provided on the movable bracket and the rotation-stopping portion can be inserted into the clamping hole;

[0033] The elastic member is arranged in the control handle, and can drive the movable bracket to move in a direction close to the rotation matching portion, so that the anti-rotation portion is inserted into the clamping hole corresponding to the anti-rotation portion;

[0034] The unlocking button is movably mounted on the control handle and can move toward the inside of the control handle under the action of external force, and causes the movable bracket to move in a direction away from the rotating fitting portion, allowing the anti-rotation portion to disengage from the corresponding card hole.

[0035] To achieve the functions of the above-mentioned steering head locking assembly, the present invention provides three specific solutions:

[0036] Option 1: A baffle and a guide block are arranged at intervals on the movable bracket, the side of the guide block close to the baffle is a guide slope, and the anti-rotation part is arranged on the outer side of the baffle; the elastic part is a spring arranged on the inner side of the baffle, and the free end of the spring corresponds to the guide slope; the lower end of the unlocking button is a guide part, and the guide part corresponds to the position between the spring and the guide slope.

[0037] Furthermore, the guide portion is wedge-shaped and has an inclined surface corresponding to the guiding inclined surface and having the same inclination.

[0038] Furthermore, a positioning groove is provided on the guide inclined surface, and a positioning block adapted to the positioning groove is provided on the guide portion.

[0039] Furthermore, the steering head locking assembly further comprises a fixed bracket, the fixed bracket is arranged in the control handle, a bracket guide groove is provided on the fixed bracket, and the movable bracket is slidably arranged in the bracket guide groove.

[0040] This solution mainly utilizes the cooperation between the movable bracket and the inclined surface of the unlocking button to realize the movement of the movable bracket, thereby realizing the engagement and disengagement of the anti-rotation part and the card hole, which is stable and reliable.

[0041] Option 2: The movable bracket is rotatably installed in the control handle through a rotating shaft, and the movable bracket includes a rotating part sleeved on the rotating shaft, and a non-rotating part and a pressing end respectively provided on the rotating part; the inner end of the unlocking button corresponds to the pressing end, and when the unlocking button moves toward the inside of the control handle, it can push the pressing end to drive the movable bracket to rotate, and drive the non-rotating part to disengage from the inserted card hole; when there is no external force pressing the unlocking button, the elastic force of the elastic member can push the non-rotating part and drive the movable bracket to rotate, and then the unlocking button is pushed back by the pressing end to reset it.

[0042] Furthermore, the elastic member is a torsion spring; the elastic member is in a pre-tightened state, one torsion leg of the elastic member abuts against the limiting structure inside the control handle, and the other torsion leg abuts against the anti-rotation portion.

[0043] Furthermore, the angle between the stop part and the pressing end is an obtuse angle, and the side of the stop part away from the pressing end is its outer side surface, the elastic part is sleeved on the rotating shaft, and the torsion leg of the elastic part close to the side of the stop part passes through the stop part from the outer side surface of the stop part.

[0044] The second solution mainly inserts or disengages the anti-rotation part into or from the clamping hole by rotating the movable bracket, and the structure is simpler than that of the first solution.

[0045] Option three, the movable bracket is slidably installed in the control handle through a slide rail, and the movable bracket includes a sliding part that slides with the slide rail, and a stop part and a key end respectively arranged on the sliding part; the stop part is a protrusion with a trapezoidal longitudinal section, and the card hole is a trapezoidal groove matching the stop part; a guide section is provided on the unlocking button, and when there is no external force pressing the unlocking button, the guide section abuts against the key end; when there is an external force pressing the unlocking button, the guide section and the key end are staggered, so that the stop part can be disengaged from the inserted card hole under the action of external force.

[0046] Furthermore, the elastic member is a torsion spring; a torsion spring limiting structure is provided inside the control handle; the elastic member is in a pre-tightened state, one of its torsion legs rests on the torsion spring limiting structure, and the other torsion leg passes through the anti-rotation portion.

[0047] Furthermore, a button limiting structure is provided inside the control handle, and a button through hole is provided on the button limiting structure; the unlocking button is slidably installed on the button through hole, and a spring column is provided at the position where the unlocking button is located inside the control handle, and a button reset spring is sleeved on the spring column, and the two ends of the button reset spring respectively abut against the button limiting structure and the unlocking button.

[0048] The principle of Option 3 is similar to that of Option 1, both of which achieve locking through the sliding of the movable bracket, but the movable bracket is locked by the contact between the unlocking button and the movable bracket, which provides better locking stability.

[0049] The beneficial effects of the present invention are:

[0050] 1. The stepless variable amplitude transmission mechanism of the present invention adds an angle adjustment mechanism to the traditional centring slider crank mechanism. The angle adjustment mechanism is used to change the distance between the rotation center of the crank and the centerline of the slider guide, forming an offset slider crank mechanism with adjustable offset distance. This not only changes the slider's motion angle, but also adjusts the slider's amplitude. The entire mechanism has a simple structure, the slider's motion angle and amplitude can be easily adjusted, and the mechanism operates stably and reliably.

[0051] 2. By using this stepless amplitude transmission mechanism for the fascia gun, users can adjust the angle of the steering head according to their needs to massage different parts of the body, thereby improving the massage range and comfort of the fascia gun; users can also adjust the angle of the steering head according to the required massage depth, thereby changing the amplitude of the massage head. Through the dual adjustment of massage angle and amplitude, the functionality and massage effect of the fascia gun are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic structural diagram of the stepless variable amplitude transmission mechanism of the present invention in state 1;

[0053] Figure 2 This is a schematic structural diagram of the stepless variable amplitude transmission mechanism of the present invention in state 2;

[0054] Figure 3 This is another structural schematic diagram of the stepless variable amplitude transmission mechanism of the present invention;

[0055] Figure 4 This is a schematic diagram of the amplitude change corresponding to the translation of the crank rotation center along the Y axis;

[0056] Figure 5 This is a schematic diagram of the corresponding amplitude change when the center line of the slider guide is translated along the Y axis;

[0057] Figure 6 It is a schematic diagram of the change in offset distance when the crank rotation center is rotated around the rotation center;

[0058] Figure 7 This is a schematic diagram of the transmission mechanism of the fascia gun of the present invention;

[0059] Figure 8 This is a schematic diagram of the change in offset distance when the fascia gun of the present invention rotates the steering head;

[0060] Figure 9 This is a schematic diagram of the overall structure of the fascia gun of the present invention;

[0061] Figure 10 It is a three-dimensional exploded view of the fascia gun of the present invention;

[0062] Figure 11 This is a three-dimensional exploded view of the transmission mechanism of the fascia gun of the present invention;

[0063] Figure 12 This is an assembly diagram of the transmission mechanism and the main body housing of the fascia gun of the present invention;

[0064] Figure 13 is a cross-sectional view of the transmission mechanism of the fascia gun of the present invention;

[0065] Figure 14 is a three-dimensional exploded view of the first embodiment of the steering head locking assembly of the present invention;

[0066] Figure 15 1 is a schematic diagram of the locked state of the second embodiment of the steering head locking assembly of the present invention;

[0067] Figure 16 1 is a schematic diagram of the unlocked state of the steering head locking assembly according to the second embodiment of the present invention;

[0068] Figure 17 yes Figure 15 A schematic diagram of a cross-sectional structure from an upward perspective;

[0069] Figure 18 yes Figure 16 A schematic diagram of a cross-sectional structure from an upward perspective;

[0070] Figure 19 1 is a schematic diagram of the locked state of the steering head locking assembly in Example 3 of the present invention;

[0071] Figure 20 1 is a schematic diagram of the unlocked state of the steering head locking assembly in Embodiment 3 of the present invention;

[0072] Figure 21 yes Figure 19 A schematic diagram of a cross-sectional structure from an upward perspective;

[0073] Figure 22 yes Figure 20 A schematic diagram of a cross-sectional structure from an upward perspective;

[0074] Marked in the figure are crank 1, connecting rod 2, slider 3, crank fixing part 4, slider guide 5, locking mechanism 6, main body housing 100, steering head cover 101, round table 102, heat dissipation hole 103, give way slide 104, rotating shaft 110, first handle 121, second handle 122, third handle 123, control handle 124, torsion spring limiting structure 130, slide rail 140, steering head 200, loading cavity 201, give way hole 202, steering head front nozzle 210, rotating fitting part 220, motor 310, motor bracket 320, connecting rod 321, surrounding wall 322, pillow block 323, anti-vibration sleeve 324, piston Sleeve 410, piston rod 420, transmission arm 430, eccentric wheel 440, main control panel 510, battery 520, charging port 530, display screen 540, power switch 550, power button 560, card hole 610, movable bracket 620, anti-rotation part 621, baffle 622, guide slope 623, positioning groove 624, rotating part 625, pressing end 626, sliding part 627, key end 628, elastic member 630, unlocking button 640, guide part 641, positioning block 642, guide section 643, spring column 644, button return spring 645, fixed bracket 650, bracket guide groove 651. DETAILED DESCRIPTION

[0075] The present invention will be further described below with reference to the accompanying drawings.

[0076] It should be noted that if directional terms are used in this disclosure, such as "up," "down," "left," "right," "forward," and "backward," these are intended to facilitate the description of the relative positions of components and are not intended to specify the absolute positions of the components or the positional relationships between them. They are used only to explain the relative positions and movement of components in a specific posture. If the posture changes, the directional terms will change accordingly. If terms referring to quantity are used in this disclosure, such as "plurality," "multiple," and "several," these specifically refer to two or more.

[0077] like Figure 1 、 Figure 2 As shown, the present invention provides a stepless variable amplitude transmission mechanism, including a crank slider mechanism composed of a crank 1, a connecting rod 2 and a slider 3 hinged in sequence, and also including an angle adjustment mechanism, the angle adjustment mechanism including a crank fixing part 4 and a slider guide part 5 hinged to each other, the hinge axis of the crank fixing part 4 and the slider guide part 5 is parallel to the axis of the rotation center of the crank 1 but not coaxial, the rotation center of the crank 1 is fixed on the crank fixing part 4, and the slider 3 is slidably set on the slider guide part 5.

[0078] The adjustment principle of the transmission mechanism is: by fixing the crank fixing member 4 and rotating the slider guide member 5, or fixing the slider guide member 5 and rotating the crank fixing member 4, or rotating the crank fixing member 4 and the slider guide member 5 at the same time, the rotation center of the crank 1 is deviated from the guide path center line of the slider 3, thereby transforming the traditional centring crank slider mechanism into an offset crank slider mechanism with adjustable offset distance. The guide path center line refers to a straight line passing through the center of the slider and parallel to the reciprocating movement path of the slider. The offset distance is the distance from the rotation center of the crank 1 to the guide path center line of the slider 3 movement, such as Figure 2 The "e" in the equation is the offset distance. When the offset distance changes, the range of movement of the slider 3 on the center line of the guide path will change, which will lead to a change in the amplitude of the slider 3.

[0079] The specific principle is as follows Figure 4 As shown, when the rotation center of the crank 1 is at point E1, according to the characteristics of the crank slider mechanism, the limit positions of the slider 3 on the X-axis are A1 and B1 respectively, and the length of A1B1 is the amplitude of the slider 3. The distance E1X0 from point E1 to the coordinate origin X0 is the current offset distance; when the rotation center of the crank 1 moves to point E2, the limit positions of the slider 3 on the X-axis are A2 and B2 respectively, and the length of A2B2 is the new amplitude of the slider 3, and E2X0 is the corresponding offset distance. It can be seen from the figure that the lengths of A1B1 and A2B2 are different, that is, the amplitude of the slider 3 has changed. In order to express the change in amplitude more intuitively, it can be assumed that the rotation center of the crank 1 is fixed, and the guide center line of the slider 3 is translated along the Y-axis instead, as shown in FIG. Figure 5 As shown, Figure 1 Moving the rotation center of crank 1 from E1 to E2 corresponds to moving the guide center line of slider 3 from L1 to L2, and the corresponding amplitude changes from A1B1 to A2B2. It can be seen that A2B2>A1B1, and the amplitude increases with the increase of offset distance.

[0080] According to the above principle, as long as the rotation axis of the crank fixing member 4 and the slider guide member 5 is not coaxial with the rotation center of the crank 1, the offset distance will change when the crank fixing member 4 or the slider guide member 5 is rotated. However, in order to better calculate the offset distance, the hinge axis of the crank fixing member 4 and the slider guide member 5 can be set to intersect with the center line of the guide path of the reciprocating motion of the slider 3. In this way, the offset distance can be directly calculated according to the rotation angle through the trigonometric function relationship. Figure 6 As shown, taking the rotation center of the crank fixing member 4 and the slider guide member 5 as an example, assuming that point C is the rotation center, when the rotation center of the crank 1 is on the X-axis, the corresponding point is E1. At this time, the distance from point E1 to the X-axis is 0, that is, the offset distance is 0; when the rotation center of the crank 1 rotates around point C by an angle α, the corresponding point is E2. The distance from E2 to the X-axis is e, and the offset distance at this time is e. The length of e can be calculated by trigonometric functions. To calculate, since the distance from the rotation center to the rotation center of crank 1 is fixed, that is, CE2 is a fixed value, the offset distance e can be adjusted by changing the angle α. Figure 3 It can also be seen that when E is on the X-axis, the offset distance e is 0 and the corresponding amplitude is also the smallest; when α is 90°, the offset distance e is the largest and the corresponding amplitude is also the largest.

[0081] In addition, when the transmission mechanism is applied to the specific structure of the fascia gun, the stability of the structure must also be considered. Therefore, the optimal solution is that the hinge center of the crank fixing member 4 and the slider guide member 5 is located on the center line of the guide path of the reciprocating motion of the slider 3, such as Figure 3 As shown, the hinge center point C between the crank fixing member 4 and the slider guide member 5 is located on the guide path center line of the reciprocating motion of the slider 3.

[0082] Based on the above two rotation schemes, assuming that when the angle between the crank fixture 4 and the slider guide 5 is 0° or 180°, the rotation center of the crank 1 is located on the guide path centerline of the slider 3, and the offset distance is 0. When the crank fixture 4 rotates 90° relative to the slider guide 5, the rotation center of the crank 1 is at its maximum distance from the guide path centerline of the slider 3, and the offset distance is at its maximum. Therefore, to avoid repeated adjustments, the rotatable angle range between the crank fixture 4 and the slider guide 5 is controlled within 0-90°, that is, the maximum rotation angle is within 0-90°.

[0083] Of course, in order for the crank slider mechanism to meet the operating conditions, it is necessary to ensure that when the crank fixing member 4 and the slider guide member 5 are at the maximum angle position, the distance from the rotation center of the crank 1 to the guide center line of the slider 3 is still less than the difference in rod length between the connecting rod 2 and the crank 1.

[0084] Furthermore, if Figure 1-3 As shown, the crankshaft 4 and the slider guide 5 further include a locking mechanism 6 connected between the crankshaft 4 and the slider guide 5 to fix the relative positions of the crankshaft 4 and the slider guide 5. After adjusting to a suitable amplitude, the locking mechanism 6 can be used to fix the crankshaft 4 and the slider guide 5 to prevent changes in the amplitude during operation. The locking mechanism 6 can have various structural forms, such as using bolts and nuts to lock the revolving pair of the crankshaft 4 and the slider guide 5, or using a connector to connect and fix the crankshaft 4 and the slider guide 5, or using a connector to fix the crankshaft 4 or the slider guide 5 to an external fixture.

[0085] Based on the above amplitude adjustment principle, the present invention designs a fascia gun, such as Figure 7 As shown, the fascia gun includes a housing, a motor 310 located within the housing, a massage head, and a reciprocating motion mechanism connected between the motor 310 and the massage head. The reciprocating motion mechanism is the above-mentioned stepless amplitude transmission mechanism. The crank 1 is an eccentric wheel 440 connected to the main shaft of the motor 310. The slider 3 is a piston rod 420 for connecting the massage head. The connecting rod 2 is a transmission arm 430 hinged between the eccentric wheel 440 and the piston rod 420. The crank fixing member 4 and / or the slider guide 5 are rotatably arranged within the housing via a hinge axis between the two. The motor 310 is fixed to the crank fixing member 4, and the piston rod 420 is slidably connected to the piston sleeve 410 on the slider guide 5. One of the crank fixing member 4 and the slider guide 5 can be fixed within the housing, and the other can rotate around the hinge axis between the two. Alternatively, both can be arranged to be rotatable. Of course, to ensure structural stability, the housing needs to include some necessary guide structures to guide and limit the rotation of the crank fixture 4 and / or the slider guide 5. The crank fixture 4 and / or the slider guide 5 also need to be provided with some toggles extending outside the housing to facilitate their rotation. During use, the user can change the distance between the main shaft of the motor 310 and the reciprocating axis of the piston rod 420 by rotating the crank fixture 4 or the slider guide 5 individually, or simultaneously. This adjusts the offset distance of the crank slider mechanism and achieves the purpose of changing the amplitude of the massage head. By comparison, rotating the motor 310 is easier to achieve than rotating the piston rod 420. Therefore, the motor bracket on which the motor 310 is mounted can be configured to rotate within the housing.

[0086] Since the above solution sets both the crank fixing part 4 and the slider guide part 5 inside the shell, it will occupy a larger shell space, which is not conducive to the miniaturization of the device. Therefore, the preferred solution is that the shell includes a main body shell 100 and a steering head 200 that are rotatably connected, the crank fixing part 4 is the main body shell 100 that fixes the motor 310, and the slider guide part 5 is the steering head 200 with a piston sleeve 410. The rotation axis of the main body shell 100 and the steering head 200 is the hinge axis of the crank fixing part 4 and the slider guide part 5. In this way, the steering head 200 and the main body shell 100 are connected externally to adjust the distance between the motor 310 and the center line of the piston rod 420 guide, without occupying the internal space of the shell. When using the fascia gun, the user can directly adjust the massage angle by rotating the steering head 200. At the same time, the main shaft of the motor 310 deviates from the reciprocating center line of the piston rod 420, and the amplitude of the massage head changes accordingly. Figure 8 As shown, when the steering head 200 rotates from state a to state b, the offset distance e changes, which in turn changes the amplitude of the massage head. Therefore, the fascia massage gun can simultaneously adjust the massage angle and the amplitude of the massage head, thereby meeting various massage needs and improving the massage effect. Furthermore, the overall structure is simple and reliable, and the massage angle and amplitude can be easily adjusted, facilitating precise control of the amplitude.

[0087] Specifically, regarding the installation method of the steering head 200 and the main body housing 100, the solution adopted by the present invention is as follows: Figure 8 、 Figure 10 As shown, the head of the steering head 200 is the steering head front mouth 210, and the tail is the rotating fitting part 220. The rotating fitting part 220 is rotatably connected to the steering head cover 101 of the main body shell 100. The axis of the rotating fitting part 220 is perpendicular to the axis of the piston sleeve 410 in the steering head 200. A mounting cavity 201 is provided in the rotating fitting part 220, and a motor bracket 320 is suspended inside the mounting cavity 201. The motor bracket 320 is fixed to the steering head cover 101 by a connecting structure passing through a clearance hole 202 at one end of the rotating fitting part 220. The main shaft of the motor 310 installed on the motor bracket 320 is parallel to the axis of the rotating fitting part 220 but not coaxial.

[0088] The rotating fitting part 220 and the steering head cover 101 are cylindrical and fit together as a whole, which can ensure the reliability of the rotational connection between the two. The rotating fitting part 220 is set so that its axis intersects perpendicularly with the axis of the piston sleeve 410 in the steering head 200, ensuring that the center of rotation of the steering head 200 is located on the guide center line of the piston rod 420, which is convenient for adjusting and controlling the amplitude. The mounting chamber 201 is set inside the rotating fitting part 220 to accommodate the motor 310, which can ensure that the steering head 200 will not interfere with the motor 310 during rotation, while leaving space for the movement of the eccentric wheel 440 and the transmission arm 430. The motor bracket 320 is suspended in the mounting chamber 201 to ensure that the vibration generated by the motor 310 during operation will not be transmitted to the steering head 200, avoiding the steering head 200 from shaking and abnormal noise, so that the fixing effect is better.

[0089] Furthermore, if Figure 10 、 Figure 13 As shown, each end of the rotating fitting portion 220 is provided with a clearance hole 202, and the clearance hole 202 is a circular hole. Two round platforms 102 are provided in the steering head cover 101, which are respectively rotatably matched with the two clearance holes 202. The steering head cover 101 is provided with heat dissipation holes 103 corresponding to the clearance holes 202. The rotational connection is achieved by the cooperation between the clearance holes 202 and the round platforms 102, thereby ensuring the reliability of the connection between the steering head 200 and the main body housing 100. The heat dissipation holes 103 on both sides are arranged relative to each other, which facilitates air convection and improves the heat dissipation effect of the motor 310. In addition, in order to reduce the vibration and collision between the rotating fitting portion 220 and the steering head cover 101, the two ends of the rotating fitting portion 220 can be made of soft rubber material, thereby improving the tightness of the connection between the rotating fitting portion 220 and the round platforms 102 and playing a certain shock-absorbing role.

[0090] In order to limit the rotation range of the steering head 200, a clearance slot 104 is provided on the steering head cover 101. Figure 10 As shown, the steering head front nozzle 210 of the steering head 200 passes through and moves along the yield chute 104. Since the offset distance in the transmission mechanism reaches its maximum when the steering head 200 rotates 90° relative to the main body housing 100, starting from the position where the main shaft of the motor 310 is located on the guide centerline of the piston rod 420, the yield chute 104 can limit the steering head's rotation within a range of 0-90°. The yield chute 104 can be configured so that when the steering head is at the 0° position, i.e., when the steering head front nozzle 210 contacts one end of the yield chute 104, the main shaft of the motor 310 intersects the axis of the piston sleeve 410. Of course, in actual product production, the adjustment of the massage angle and the amplitude can be considered separately. When only the massage angle is considered, the steering head's rotation range can be larger; when only the amplitude is adjusted, the steering head's maximum rotation angle can also be less than 90°.

[0091] Regarding the connection structure between the motor bracket 320 and the steering head cover 101 , the present invention provides three solutions.

[0092] Option 1: Figure 11 As shown, the connection structure includes a connecting rod 321 provided on the motor bracket 320. The connecting end of the connecting rod 321 passes through the mounting cavity 201 from the clearance hole 202 and is connected to the steering head cover 101. The connection structure formed by the connecting rod 321 has a simple structure and is easy to manufacture and install.

[0093] Solution 2: The connection structure includes a motor connection portion provided on the steering head housing 101. The motor connection portion extends through the clearance hole 202 into the loading cavity 201 and is connected to the motor bracket 320. The connection structure formed by the motor connection portion not only strengthens the steering head housing 101 but also facilitates the rotational connection and improves the stability of the mating between the rotating mating portion 220 and the steering head housing 101, thereby increasing the service life of the fascia gun.

[0094] Option three, the connecting structure includes a connecting rod 321 arranged on the motor bracket 320 and a motor connecting part arranged on the steering head cover 101, the motor connecting part passes through the mounting cavity 201 from the clearance hole 202, and the connecting end of the connecting rod 321 is connected to the motor connecting part; the connecting structure jointly constituted by the connecting rod 321 and the motor connecting part has the above advantages, only slightly increases the complexity of the structure, and the cost is not high.

[0095] The connecting rod 321 is usually arranged at the edge of the motor bracket 320, and its structure can be various, such as: a circular column, a prismatic column, a polygonal column, a conical column, etc. In order to increase the strength of the entire motor bracket 320 and the stability of the connection, there are at least two connecting rods 321, and a wall 322 is provided between any two adjacent connecting rods 321. In order to reduce the vibration transmitted from the motor 310 to the steering head cover 101 and avoid abnormal noise, the connecting rod 321 can be a rivet column or a screw column. For easy disassembly, a screw column is preferably used, which is fixedly connected to the steering head cover 101 by screws; a pillow block 323 is provided at the connecting end of the connecting rod 321, and an anti-vibration sleeve 324 is provided on the pillow block 323 to abut against the steering head cover 101. The anti-vibration sleeve 324 is usually made of a flexible or elastic material, preferably made of rubber or silicone; the screws can fix the connecting rod 321 and the anti-vibration sleeve 324 to the steering head cover 101, and the anti-vibration sleeve 324 is in contact with the steering head cover 101, so that the vibration transmitted to the connecting rod 321 by the motor 310 can be buffered by the anti-vibration sleeve 324, thereby reducing the vibration transmitted to the steering head cover 101 and avoiding abnormal noise caused by vibration, collision and the like.

[0096] like Figure 9As shown, in order to facilitate holding the fascia gun, the main body shell also includes a first handle 121, a third handle 123, a second handle 122 and a control handle 124 connected in sequence, and the axis of the first handle 121, the axis of the third handle 123, the axis of the second handle 122 and the axis of the control handle 124 form a parallelogram; the steering head cover 101 is arranged at the intersection of the first handle 121 and the control handle 124; the connection between the first handle 121 and the third handle 123, the connection between the second handle 122 and the third handle 123, and the connection between the second handle 122 and the control handle 124 are all smooth transition connections.

[0097] The parallelogram-shaped handle ensures that the center of gravity of the entire fascia gun is aligned as closely as possible with the axis of the impact force when the steering head is rotated to various angles. Multiple handles are available to ensure that the axis of the impact force is as perpendicular as possible to the direction of grip. This allows users to adjust the grip of the handle according to the massage angle and selected amplitude, thereby reducing lateral reaction force and preventing a loose grip. Lateral reaction force generally refers to a reaction force parallel to the user's grip direction. Usually, a reaction force perpendicular to the user's grip direction ensures that the user holds the handle tightly, facilitates force application, and improves the massage effect.

[0098] To ensure that the grip can be changed to adjust the extension distance of the massage head, while ensuring that the enclosed oblique parallelogram grip space can pass through the palm, the angle between the axis of the second handle and the axis of the third handle is 30° to 80°, and the relative obtuse angle is 100° to 150°. This angle range, combined with appropriate chamfers for transition, can meet the needs of palm grip to improve grip comfort and further ensure that after grasping the adjacent handle, the thumb, index finger, or pinky finger can be placed on the adjacent handle for support. To adapt the handle to the amplitude adjustment angle, it can be set so that the axis of the piston sleeve is perpendicular to the axis of the first handle when the steering head is in the 0° position.

[0099] To control the fascia massage gun, the gun also includes a control assembly, comprising a main control board 510 and a battery 520. The main control board 510 is located within the second handle 122, while the battery 520 is located within the first and third handles 121, 123. The motor 310 and the battery 520 are electrically connected to the main control board 510, respectively. The main control board 510 is primarily used to control the operating state of the fascia massage gun, while the battery 520 is primarily used for power supply. Polymer batteries are typically used as the battery 520. The battery 520 is located within the first and third handles 121, 123. The degree of coincidence between the center of gravity of the entire fascia gun and the axis of the impact force when the steering head 200 is rotated to various angles can be further improved, thereby improving the use effect. In particular, the battery 520 itself has a large weight. After the battery 520 is installed separately, the center of gravity position of the fascia gun is adjusted accordingly, so that the center of gravity axis generated after adjustment according to the grip handle and the direction of the striking force axis can have a high degree of coincidence or a smaller angle with the axis of the impact force during use. The gravity effect of the fascia gun can be superimposed on the axis of the impact force, increasing the force when outputting the striking force, and the vibration generated during the reset movement is partially offset by gravity, reducing the vibration of the grip. In addition, in order to facilitate charging the battery 520, a charging port is provided on the third handle, and the charging port is electrically connected to the main control board. In order to facilitate the display of the working status of the fascia gun and the control of the fascia gun, a display screen, a power switch and a power button are provided on the control handle. The display screen is electrically connected to the main control panel, the power switch is arranged in the control handle and electrically connected to the main control panel, and the power button is arranged on the control handle and corresponds to the power switch.

[0100] Furthermore, in order to fix the steering head after adjusting the angle of the steering head and the amplitude of the massage head, the fascia gun also includes a steering head locking assembly. Figure 14-22As shown, the steering head locking assembly includes a locking hole 610, a movable bracket 620, an elastic member 630 and an unlocking button 640; the locking hole 610 is opened on the outer edge of the rotating matching portion 220, and there are at least two locking holes 610 and spaced apart along the rotation direction of the rotating matching portion 220; the movable bracket 620 is movably installed in the main body housing 100, and the movable bracket 620 is provided with a rotation-stopping portion 621 and the rotation-stopping portion 621 can be inserted into at least two locking holes 610; the elastic member 6 30 is arranged in the host shell 100, which can drive the movable bracket 620 to move in the direction close to the rotating fitting part 220, so that the anti-rotation part 621 is inserted into the card hole 610 corresponding to the anti-rotation part 621; the unlocking button 640 is movably installed on the host shell 100, and can move toward the inside of the host shell 100 under the action of external force, and make the movable bracket 620 move in the direction away from the rotating fitting part 220, so that the anti-rotation part 621 is disengaged from the inserted card hole 610.

[0101] During the use of the steering head locking assembly, the unlocking button 640 is pressed. Under the action of external force, the unlocking button 640 moves toward the inside of the main body shell 100, and drives the anti-rotation part 621 to move in the direction away from the rotating matching part 220, and disengages from the inserted card hole 610 to achieve unlocking; the entire use process is easy to operate and has a good locking effect.

[0102] The clamping hole 610 is mainly used to clamp the movable bracket 620 to lock the steering head 200; the number of the clamping holes 610 and the corresponding central angle can be flexibly selected according to the set rotation gear, so that the steering head 200 can be adjusted to more and more accurate angle positions, which is convenient for massaging different parts of the body, and also has multiple amplitudes for adjustment.

[0103] The movable bracket 620 is a locking and clamping component, and the anti-rotation part 621 it has is mainly used to be inserted into the clamping hole 610 to lock and fix the steering head 200; the movable bracket 620 can be movably installed in the main body shell 100 in a variety of ways, such as: slidable installation, swingable installation, etc.; the structure of the anti-rotation part 621 can be various, such as: rectangular, cylindrical, conical, etc. When the clamping hole 610 is needed to guide the anti-rotation part 621, the side of the anti-rotation part 621 corresponding to the rotation direction of the rotating matching part 220 can usually be set as a guide surface of an inclined or arc-shaped structure.

[0104] The elastic member is a key component of the steering head locking assembly. It utilizes its own elastic force to reset the unlock button 640 and move the anti-rotation portion 621 toward the rotational engagement portion 220. It also inserts the anti-rotation portion 621 into the corresponding locking hole 610, thereby achieving the locking function. The elastic member can be of various types, such as a spring, rubber band, disc spring, torsion spring, and the like.

[0105] The unlock button 640 is a manual button of the steering head locking assembly, which is mainly used for manually controlling the unlocking of the steering head 200; the unlock button 640 can be movably installed on the main body shell 100 in a variety of ways, such as: sliding fit, rotatable installation, etc.

[0106] According to the functions that the locking assembly needs to achieve, the present invention provides the following three specific structural forms:

[0107] Example 1:

[0108] like Figure 14 As shown, a baffle 622 and a guide block are spaced apart on the movable bracket 620, the side of the guide block close to the baffle 622 is a guide slope 623, and the anti-rotation portion 621 is arranged on the outer side of the baffle 622; the elastic member 630 is a spring arranged on the inner side of the baffle 622, and the free end of the spring corresponds to the guide slope 623; the lower end of the unlocking button 640 is a guide portion 641, and the guide portion 641 corresponds to the position between the spring and the guide slope 623. The spring can push the unlock button 640 and the movable bracket 620 to form and maintain a wedge-shaped fit, and since the movable bracket 620 is movably installed, when the unlock button 640 is pressed downward, the wedge-shaped fit drives the movable bracket 620 to move in a direction away from the rotating fit portion 220. At this time, the guide portion 641 will squeeze the spring to put it in a pre-tightened state; after the pressing force is released, the elastic force of the spring will push the unlock button 640 to move upward and reset, and push the movable bracket 620 to move in a direction close to the rotating fit portion 220, so that the anti-rotation portion 621 is inserted into the corresponding card hole 610.

[0109] On the basis of the above, in order to facilitate guiding, the guide portion 641 is wedge-shaped and has an inclined surface corresponding to the guiding inclined surface 623 and having the same inclination.

[0110] In order to ensure accurate alignment and effectiveness of unlocking, Figure 14 As shown, a positioning groove 624 is formed on the guide inclined surface 623 , and a positioning block 642 adapted to the positioning groove 624 is provided on the guide portion 641 .

[0111] Specifically, the steering head locking assembly further includes a fixed bracket 650 disposed within the main body housing 100. The fixed bracket 650 defines a bracket guide groove 651, and the movable bracket 620 is slidably disposed within the bracket guide groove 651. Slidingly mounting the movable bracket 620 on the fixed bracket 650 not only facilitates guiding the movable bracket 620 but also ensures the effectiveness of unlocking the steering head 200.

[0112] Example 2:

[0113] like Figure 15-18 As shown, the movable bracket 620 is rotatably installed in the main body shell 100 through the rotating shaft 110, and the movable bracket 620 includes a rotating part 625 sleeved on the rotating shaft 110, and a stop part 621 and a pressing end 626 respectively provided on the rotating part 625; the inner end of the unlocking button 640 corresponds to the pressing end 626, and when the unlocking button 640 moves toward the interior of the main body shell 100, it can push the pressing end 626 to drive the movable bracket 620 to rotate, and drive the stop part 621 to disengage from the inserted card hole 610; when there is no external force pressing the unlocking button 640, the elastic force of the elastic member 630 can push the stop part 621 and drive the movable bracket 620 to rotate, and then the unlocking button 640 is pushed back by the pressing end 626 to reset it.

[0114] The movable bracket 620 of the locking mechanism is configured as a lever. The elastic force of the elastic member 630 forces the anti-rotation portion 621 of the movable bracket 620 to engage one of the locking holes 610, locking the steering head 200 at a certain angle. The unlocking button 640 controls the anti-rotation portion 621 of the movable bracket 620 to move away from or toward the rotating mating portion 220 of the steering head 200. When the unlocking button 640 is pressed, the movable bracket 620 rotates about the rotation axis 110, driving the anti-rotation portion 621 out of the inserted locking hole 610, allowing the steering head 200 to rotate and adjust its angle. When the user adjusts the angle or amplitude to the desired position, the unlocking button 640 is released. The elastic member 630 pushes the anti-rotation portion 621, driving the movable bracket 620 to rotate. The pressing end 626 then pushes the unlocking button 640 back to reset the movable bracket 620. The locking force of the locking mechanism is determined by the elastic force of the elastic member 630. The locking mechanism has the advantages of simple structure, efficient transmission, and convenient operation.

[0115] On the basis of the above, in order to further simplify the structure and reduce costs, the elastic member 630 is a torsion spring; when the elastic member 630 is in a pre-tightened state, one torsion leg of the elastic member 630 abuts against a limiting structure inside the main body housing 100, and the other torsion leg abuts against the anti-rotation portion 621. The limiting structure can be a baffle or sidewall, or a retaining groove or slot.

[0116] Specifically, the angle between the stopper 621 and the pressing end 626 is obtuse, and the side of the stopper 621 away from the pressing end 626 is its outer side. The elastic member 630 is sleeved on the rotating shaft 110, and the torsion leg of the elastic member 630 on the side closest to the stopper 621 passes through the outer side of the stopper 621. This structure of the movable bracket 620 has good force transmission and long distance, which is convenient for operation with the unlocking button 640. It also has a simple structure and can better ensure the locking effect.

[0117] Example 3:

[0118] like Figure 19-22 As shown, the movable bracket 620 is slidably installed in the main body shell 100 through the slide rail 140, and the movable bracket 620 includes a sliding part 627 that slides together with the slide rail 140, and a stop part 621 and a key end 628 respectively arranged on the sliding part 627; the stop part 621 is a protrusion with a trapezoidal longitudinal section, and the card hole 610 is a trapezoidal groove matching the stop part 621; the unlocking button 640 is provided with a guide section 643, when there is no external force pressing the unlocking button 640, the guide section 643 abuts against the key end 628; when there is an external force pressing the unlocking button 640, the guide section 643 and the key end 628 are staggered, so that the stop part 621 can be disengaged from the inserted card hole 610 under the action of external force.

[0119] The movable bracket 620 of the above-mentioned locking mechanism is arranged in the form of a sliding rod. The elastic force of the elastic member 630 causes the anti-rotation portion 621 of the movable bracket 620 to be inserted into one of the card holes 610, thereby locking the steering head 200 at a certain angle. In normal state, the guide section 643 of the unlocking button 640 abuts against the blocking key end 628 of the movable bracket 620, so that the movable bracket 620 cannot slide, thereby locking the steering head 200 at the required angle. When the unlock button 640 is pressed, the unlock button 640 moves and drives the guide section 643 to give way, causing the guide section 643 to be offset from the stop key end 628, thereby freeing space for the movable bracket 620 to slide. When the steering head 200 is rotated by an external force, the trapezoidal protrusion cooperates with the inclined surface of the trapezoidal groove, allowing the anti-rotation portion 621 to overcome the elastic force of the elastic member 630 and passively disengage from the locking hole 610. At this time, the steering head 200 can be rotated to adjust the angle and amplitude. When the user adjusts the angle position or amplitude to the desired position, the unlock button 640 is released, and the unlock button 640 is reset, and the guide section 643 abuts against the stop key end 628, realizing the locking function. The above-mentioned locking mechanism can realize the locking function by occupying the sliding position of the movable bracket 620 by the guide section 643 of the unlock button 640. It has the advantages of simple structure and good locking effect.

[0120] On the basis of the above, to further simplify the structure and reduce costs, the elastic member 630 is a torsion spring; a torsion spring limiting structure 130 is provided inside the host housing 100; the elastic member 630 is in a pre-tightened state, with one torsion leg of the elastic member 630 resting against the torsion spring limiting structure 130, and the other torsion leg of the elastic member 630 passing through the anti-rotation portion 621. The torsion spring limiting structure 130 can be a baffle or sidewall, or a retaining groove or slot.

[0121] To facilitate the reset of the unlock button 640, a button retaining structure is provided within the host housing 100. The retaining structure is provided with a button through-hole. The unlock button 640 is slidably mounted on the button through-hole. A spring column 644 is provided at the portion of the unlock button 640 located within the control handle 124. A button return spring 645 is sleeved on the spring column 644. The two ends of the button return spring 645 respectively abut against the button retaining structure and the unlock button 640. To ensure that the unlock button 640 does not fall out of the button through-hole, a corresponding retaining structure can be provided between the unlock button 640 and the button through-hole, or the two ends of the button return spring 645 can be directly fixedly connected to the unlock button 640 and the button retaining structure, respectively. The key return spring 645 is used to prevent the unlock button 640 from falling out. In the natural state, the unlock button 640 is in an exposed state under the action of the button return spring 645. When the unlock button 640 is pressed, it overcomes the elastic force of the button return spring 645 and moves into the button through hole. After releasing the button, the unlock button 640 is reset under the action of the button return spring 645.

Claims

1. A stepless variable amplitude transmission mechanism, comprising a crank slider mechanism consisting of a crank (1), a connecting rod (2) and a slider (3) hinged in sequence, characterized in that: The invention also includes an angle adjustment mechanism and a locking mechanism (6), wherein the angle adjustment mechanism includes a crank fixing member (4) and a slider guide member (5) that are hinged to each other, wherein the hinge axis of the crank fixing member (4) and the slider guide member (5) is parallel to the axis of the rotation center of the crank (1) but not coaxial, and the rotation center of the crank (1) is fixed on the crank fixing member (4), and the slider (3) is slidably arranged on the slider guide member (5); and the locking mechanism (6) is arranged between the crank fixing member (4) and the slider guide member (5) to fix the relative position of the crank fixing member (4) and the slider guide member (5).

2. The stepless variable amplitude transmission mechanism according to claim 1, wherein: The hinge axis of the crank fixing member (4) and the slider guide member (5) intersects with the center line of the guide path of the reciprocating motion of the slider (3).

3. The stepless variable amplitude transmission mechanism according to claim 1, wherein: The hinge center of the crank fixing member (4) and the slider guide member (5) is located on the guide path center line of the reciprocating motion of the slider (3).

4. The stepless amplitude transmission mechanism according to claim 2 or 3, characterized in that: The range of the rotatable angle between the crank fixing member (4) and the slider guide member (5) is 0-90°.

5. The stepless amplitude transmission mechanism according to claim 4, characterized in that: When the crank fixing member (4) and the slider guide member (5) are at the maximum angle, the distance from the rotation center of the crank (1) to the guide path center line of the slider (3) is less than the difference between the rod lengths of the connecting rod (2) and the crank (1).

6. A fascia gun comprising a housing, a motor (310) located within the housing, a massage head, and a reciprocating motion mechanism connected between the motor (310) and the massage head, wherein: The reciprocating motion mechanism is a stepless amplitude-variable transmission mechanism according to any one of claims 1 to 5, wherein the crank (1) is an eccentric wheel (440) connected to the main shaft of the motor (310), the slider (3) is a piston rod (420) for connecting the massage head, the connecting rod (2) is a transmission arm (430) hinged between the eccentric wheel (440) and the piston rod (420), the crank fixing member (4) and / or the slider guide member (5) are rotatably arranged in the housing through the hinge axis of the two, the motor (310) is fixed on the crank fixing member (4), and the piston rod (420) is slidably connected to the piston sleeve (410) on the slider guide member (5).

7. The fascia gun according to claim 6, characterized in that: The housing comprises a main housing (100) and a steering head (200) that are rotatably connected; the crank fixing member (4) is the main housing (100) that fixes the motor (310); the slider guide member (5) is the steering head (200) with a piston sleeve (410); and the rotation axis of the main housing (100) and the steering head (200) is the hinge axis of the crank fixing member (4) and the slider guide member (5).

8. The fascia gun according to claim 7, characterized in that: The head of the steering head (200) is a steering head front nozzle (210), and the tail is a rotating fitting part (220). The rotating fitting part (220) is rotatably connected to the steering head cover (101) of the main body housing (100). The axis of the rotating fitting part (220) is perpendicularly intersected with the axis of the piston sleeve (410) in the steering head (200). A mounting cavity (201) is provided in the rotating fitting part (220). A motor bracket (320) is suspended inside the mounting cavity (201). The motor bracket (320) is fixed to the steering head cover (101) through a connection structure passing through a clearance hole (202) at one end of the rotating fitting part (220). The main shaft of the motor (310) mounted on the motor bracket (320) is parallel to the axis of the rotating fitting part (220) but not coaxial.

9. The fascia gun according to claim 8, characterized in that: The main body housing (100) further comprises a first handle (121), a third handle (123), a second handle (122) and a control handle (124) which are connected in sequence, and the axis of the first handle (121), the axis of the third handle (123), the axis of the second handle (122) and the axis of the control handle (124) enclose a parallelogram; the steering head cover (101) is arranged at the intersection of the first handle (121) and the control handle (124); the connection between the first handle (121) and the third handle (123), the connection between the second handle (122) and the third handle (123) and the connection between the second handle (122) and the control handle (124) are all smoothly transitioned.

10. The fascia gun according to claim 9, characterized in that: Also included is a steering head locking assembly, the steering head locking assembly comprising a locking hole (610), a movable bracket (620), an elastic member (630) and an unlocking button (640); The clamping holes (610) are formed on the outer edge of the rotating fitting portion (220), and there are at least two clamping holes (610) distributed at intervals along the rotation direction of the rotating fitting portion (220); The movable bracket (620) is movably mounted in the control handle (124); a rotation-stopping portion (621) is provided on the movable bracket (620), and the rotation-stopping portion (621) can be inserted into the clamping hole (610); The elastic member (630) is disposed in the control handle (124), and is capable of driving the movable bracket (620) to move toward the direction close to the rotating fitting portion (220), so that the anti-rotation portion (621) is inserted into the clamping hole (610) corresponding to the anti-rotation portion (621); The unlocking button (640) is movably mounted on the control handle (124) and can move toward the inside of the control handle (124) under the action of external pressure, and causes the movable bracket (620) to move in a direction away from the rotating fitting portion (220), allowing the anti-rotation portion (621) to disengage from the corresponding clamping hole (610).

11. The fascia gun according to claim 10, characterized in that: A baffle (622) and a guide block are arranged at intervals on the movable bracket (620), and the side of the guide block close to the baffle (622) is a guide slope (623). The anti-rotation portion (621) is arranged on the outer side of the baffle (622); the elastic member (630) is a spring arranged on the inner side of the baffle (622), and the free end of the spring corresponds to the guide slope (623); the lower end of the unlocking button (640) is a guide portion (641), and the guide portion (641) corresponds to the position between the spring and the guide slope (623).

12. The fascia gun according to claim 11, characterized in that: The guide portion (641) is wedge-shaped and has an inclined surface corresponding to the guide inclined surface (623) and having the same inclination.

13. The fascia gun according to claim 11, characterized in that: A positioning groove (624) is provided on the guide inclined surface (623), and a positioning block (642) adapted to the positioning groove (624) is provided on the guide portion (641).

14. The fascia gun according to claim 10, characterized in that: The steering head locking assembly further comprises a fixed bracket (650), the fixed bracket (650) being arranged in the control handle (124), a bracket guide groove (651) being provided on the fixed bracket (650), and the movable bracket (620) being slidably arranged in the bracket guide groove (651).

15. The fascia gun according to claim 10, characterized in that: The movable bracket (620) is rotatably mounted in the control handle (124) via the rotating shaft (110). The movable bracket (620) includes a rotating portion (625) sleeved on the rotating shaft (110), and a rotation-stopping portion (621) and a pressing end (626) respectively arranged on the rotating portion (625); the inner end of the unlocking button (640) corresponds to the pressing end (626), and when the unlocking button (640) moves toward the inside of the control handle (124), it can push the pressing end (626) to drive the movable bracket (620) to rotate and drive the rotation-stopping portion (621) to disengage from the card hole (610) into which it is inserted; when there is no external force pressing the unlocking button (640), the elastic force of the elastic member (630) can push the rotation-stopping portion (621) and drive the movable bracket (620) to rotate, and then the unlocking button (640) is pushed back by the pressing end (626) to reset it.

16. The fascia gun according to claim 15, characterized in that: The elastic member (630) is a torsion spring; the elastic member (630) is in a pre-tightened state, one torsion leg of the elastic member abuts against a limiting structure inside the control handle (124), and the other torsion leg of the elastic member abuts against the anti-rotation portion (621).

17. The fascia gun according to claim 16, characterized in that: The angle between the anti-rotation portion (621) and the pressing end (626) is an obtuse angle, and the side of the anti-rotation portion (621) away from the pressing end (626) is its outer side. The elastic member (630) is sleeved on the rotating shaft (110), and the torsion leg of the elastic member (630) close to the anti-rotation portion (621) passes through the anti-rotation portion (621) from the outer side of the anti-rotation portion (621).

18. The fascia gun according to claim 10, characterized in that: The movable bracket (620) is slidably installed in the control handle (124) through the slide rail (140), and the movable bracket (620) includes a sliding portion (627) that slides together with the slide rail (140), and a stop portion (621) and a key end (628) respectively arranged on the sliding portion (627); the stop portion (621) is a protrusion with a trapezoidal longitudinal section, and the clamping hole (610) is a trapezoidal groove matching the stop portion (621); the unlocking button (640) is provided with a guide section (643), and when there is no external force pressing the unlocking button (640), the guide section (643) abuts against the key end (628); when there is an external force pressing the unlocking button (640), the guide section (643) and the key end (628) are offset from each other, so that the stop portion (621) can be disengaged from the clamping hole (610) into which it is inserted under the action of external force.

19. The fascia gun according to claim 18, characterized in that: The elastic member (630) is a torsion spring; a torsion spring limiting structure (130) is provided inside the control handle (124); the elastic member (630) is in a pre-tightened state, one torsion leg of the elastic member rests on the torsion spring limiting structure (130), and the other torsion leg of the elastic member passes through the anti-rotation portion (621).

20. The fascia gun according to claim 19, characterized in that: A button limiting structure is provided inside the control handle (124), a button through hole is provided on the button limiting structure, the unlocking button (640) is slidably mounted on the button through hole, a spring column (644) is provided at a portion of the unlocking button (640) located inside the control handle (124), a button return spring (645) is sleeved on the spring column (644), and two ends of the button return spring (645) respectively abut against the button limiting structure and the unlocking button (640).

Images