Portable fitness appliance
By using the inclined surface of the inner working part of the support arm and the downward extrusion slider in the portable fitness equipment, the problems of complex structure and limited exercise strength in the prior art are solved, and the effects of structural simplification, production cost reduction and exercise strength increase are achieved.
Patent Information
- Application Number
- CN202510119579.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2025-03-18
AI Technical Summary
The existing portable fitness equipment has complex structure, high production costs, and limited exercise intensity.
When the inner working part of the support arm is closed, the slope is used to press downwards to simplify the structure and provide a longer compression stroke of the elastic member.
Simplified structure, reduced production costs, and improved exercise intensity and training effect.
Smart Images

Figure CN119633325A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a portable fitness device, in particular to a fitness device used for exercising and strengthening leg or arm strength. Background Art
[0002] Among the existing portable fitness equipment, the leg exerciser disclosed in CN114191784A is representative. The leg exerciser is mainly composed of a main body and a leg support part, wherein the main body includes a driving rod, a spring and a limiting part. The upper end of the driving rod is connected to the support arm through a connecting rod assembly, and the spring is sleeved on the outside of the driving rod; the limiting part is connected to the lower end of the driving rod and supports the lower end of the spring, while the upper end of the spring is restricted and positioned.
[0003] In the initial state, the two leg rests are in an open state, and the spring is in an extended state. When the exerciser clamps the two leg rests toward each other, the rotating arm pulls the driving rod upward through the connecting rod assembly, so that the lower end of the spring is pressed upward by the limiting part, so that the spring enters a compressed state. The exerciser achieves the purpose of exercise by compressing the spring.
[0004] There are at least two problems with this exerciser:
[0005] 1. From a structural point of view, its structure is relatively complex, which makes the production cost high and is not conducive to the promotion and popularization of the product.
[0006] 2. The support arm is connected to the driving rod through a connecting rod and is restricted by the inner space of the circular base. The compression stroke of the spring is limited, so that the maximum strength of the exerciser is restricted. Summary of the invention
[0007] The technical problem to be solved by the present invention is to provide a portable fitness device which has a simplified structure and can improve the training intensity.
[0008] The core technical concept of the present invention is to squeeze the slider downward through the inclined surface when the inner acting part of the support arm is closed, thereby simplifying the structure and providing the slider with a larger downward space. The slider has a larger downward space, thereby providing the elastic part with a longer compression stroke, thereby improving the training force.
[0009] The technical solution adopted by the present invention to solve the above technical problems is as follows: a portable fitness device comprises a base, two supporting arms, a sliding block and an elastic member;
[0010] The upper end of the support arm is hinged to both sides of the base, and the lower end of the support arm can be close to or away from the base;
[0011] The base is longitudinally slidably provided with a slider located between the two arms, and an elastic member is provided below the slider;
[0012] The inner side of the support arm is provided with an action portion, and the slider is provided with a matching portion; the matching portion is an inclined side surface of both sides of the slider that gradually expands outward from top to bottom;
[0013] When the two arms are forced to close, the action portion gradually contacts and squeezes the inclined side surface from top to bottom, and the action portions of the two arms act on the matching portion of the slider and push the slider to move downward to squeeze the elastic member.
[0014] The preferred technical solution adopted by the present invention to solve the above technical problem is: the base includes a fixed block and a fixed rod, and the elastic member is a spring sleeved on the fixed rod;
[0015] A limiting portion is provided at the lower end of the fixing rod, the sliding block is sleeved on the fixing rod, and the spring is located between the limiting portion and the sliding block.
[0016] The preferred technical solution adopted by the present invention to solve the above technical problem is: the action part is located on the convex part protruding toward the inner side of the support arm, and includes a first inclined surface and a second inclined surface from top to bottom; the slope of the first inclined surface is greater than that of the second inclined surface.
[0017] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: a guide structure is provided between the support arm and the slider; the guide structure includes a convex ridge on the inner side of the support arm and a slide groove on the inner side of the slider; when the two support arms are forced to close, the convex ridge is embedded in the slide groove; the action part is located on the inner side surface of the convex ridge, and the matching part is located at the bottom of the slide groove.
[0018] The preferred technical solution adopted by the present invention to solve the above technical problem is: the sliding block also includes a vertical side surface below the inclined side surface, and the sliding groove extends to the vertical side surface.
[0019] The preferred technical solution adopted by the present invention to solve the above technical problems is: the lower end of the fixing rod is a threaded section, and the limiting part is a knob threadably matched with the threaded section; the opening range of the two arms and / or the initial potential energy of the spring can be adjusted by the knob.
[0020] The preferred technical solution adopted by the present invention to solve the above technical problems is: a portable fitness device comprises a fixed block, a fixed rod, two supporting arms, a sliding block and a spring;
[0021] The upper end of the fixing rod is fixedly connected to the middle position of the fixing block; the lower end of the fixing rod is provided with a limiting portion;
[0022] The upper ends of the two supporting arms are respectively axially connected to one side of the fixed block;
[0023] The slider is slidably mounted on the fixing rod; the spring is sleeved on the fixing rod between the slider and the limiting portion;
[0024] When the two arms are forced to close, the inner side surfaces of the two arms contact and act on the outer surface of the slider, pushing the slider to move along the lower end of the fixing rod, thereby compressing the spring.
[0025] The preferred technical solution adopted by the present invention to solve the above technical problem is: the slider is a trapezoidal structure that is narrow at the top and wide at the bottom, the slider comprises a bottom surface, a top surface and two symmetrical inclined side surfaces, the slider is provided with a through hole extending from the bottom surface to the top surface, and the fixing rod passes through the through hole;
[0026] The upper end of the spring is pressed against the bottom surface of the slider; when the two arms are forced to close, the inner side surfaces of the arms press against the inclined side surfaces of the slider, pushing the slider to move downward along the fixing rod.
[0027] The preferred technical solution adopted by the present invention to solve the above technical problem is: a guide structure is provided between the inner side surface of the support arm and the inclined side surface of the slider;
[0028] The guide structure comprises a convex ridge on the inner side surface of the support arm and a sliding groove on the inclined side surface of the sliding block.
[0029] The preferred technical solution adopted by the present invention to solve the above technical problems is: the fixing block includes a central part and mounting cavities on both sides, the upper end of the fixing rod extends into and is fixed to the central part, and the pin connects the upper end of the support arm to the mounting cavity.
[0030] The preferred technical solution adopted by the present invention to solve the above technical problem is: the sliding block also includes a vertical side surface below the inclined side surface, and the sliding groove extends to the vertical side surface.
[0031] The preferred technical solution adopted by the present invention to solve the above technical problem is: the lower end of the fixing rod is a threaded section, the limiting part is a knob, and the knob is adjustably screwed on the threaded section;
[0032] The opening range of the two arms and / or the initial potential energy of the spring can be adjusted by a knob.
[0033] The preferred technical solution adopted by the present invention to solve the above technical problems is: a portable fitness device comprises a fixed block, a fixed rod, two supporting arms, a sliding block and a spring;
[0034] The fixing block includes a central portion and mounting cavities on both sides, the upper end of the fixing rod extends into and is fixed to the central portion, and the pin axially connects the upper end of the support arm to the mounting cavity;
[0035] The lower end of the fixing rod is provided with a threaded section, and the knob is adjustably screwed on the threaded section;
[0036] The spring is slidably mounted on the fixed rod between the slider and the knob;
[0037] The slider is in a trapezoidal structure that is narrow at the top and wide at the bottom, and comprises a bottom surface, a top surface, and two symmetrical inclined side surfaces;
[0038] The slider is provided with a through hole extending from the bottom surface to the top surface, and the fixing rod passes through the through hole;
[0039] When the two arms are forced to close, the inner sides of the two arms contact and act on the inclined side of the slider, pushing the slider to move along the lower end of the fixing rod, thereby compressing the spring.
[0040] Compared with the prior art, the advantages of the present invention are:
[0041] 1. The hinge design at the upper end of the support arm, the longitudinal sliding fit of the slider on the base, and the extrusion fit between the support arm and the slider ensure stability and smoothness during movement. The structure is simpler, which reduces production costs for enterprises and promotes the promotion and popularization of products.
[0042] 2. The slider has a larger downward space, which means that the user needs to overcome a larger displacement distance when closing the arm, thus providing a longer compression stroke for the elastic part. This not only increases the difficulty and intensity of training, but also exercises the user's muscle groups more comprehensively, effectively improving the training effect and user experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.
[0044] Figure 1 Reference for the use of portable fitness equipment Figure 1 ;
[0045] Figure 2 Reference for the use of portable fitness equipment Figure 2 ;
[0046] Figure 3 It is a structural schematic diagram of a portable fitness device with ear plates;
[0047] Figure 4 A diagram of another portable fitness device with ear plates in a closed state;
[0048] Figure 5 A diagram of another portable fitness device with ear plates in an unfolded state;
[0049] Figure 6 is a cross-sectional view of a portable fitness device;
[0050] Figure 7 An exploded view of a portable fitness device;
[0051] Figure 8 A quarter cross-sectional view of a portable fitness device. DETAILED DESCRIPTION
[0052] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.
[0053] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it will not be further defined or explained in the subsequent drawings.
[0054] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the invention product is usually placed when in use, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. "First" and "second" are only for the purpose of making the description easier to understand, without any other directional meaning, and cannot be used as a limitation on the present invention.
[0055] like Figure 1 , 2 As shown, the portable fitness equipment 100 is used for exercising the upper and lower limb muscles of the human body. It includes a base 1 and two arms 2. The upper ends of the arms 2 are hinged to the two sides of the base 1, and the lower ends of the arms 2 can be close to or away from the base 1. The arms 2 are squeezed and prevented from loosening by the limbs on both sides, and the purpose of exercise is achieved by closing and unfolding.
[0056] Preferably, as shown in the figure, the arm 2 is provided with an ear plate 21. The ear plate 21 can have various shapes, for example Figure 3 The square shown and Figure 4 The outer surface shown is convexly curved. Figure 4 The ear plate 21 shown matches the shape of the human body's legs and arms. The ear plate 21 is provided with a strap 22 for fixing with the human body.
[0057] like Figure 3-6 As shown, the portable fitness equipment 100 has a slider 3 between two arms 2 which is longitudinally slidable on the base 1, and an elastic member 4 is provided below the slider 3; an action portion K1 is provided on the inner side of the arm 2, and a matching portion K2 is provided on the slider 3; when the two arms 2 are forced to close, the action portions K1 of the two arms 2 act on the matching portion K2 of the slider 3 and push the slider 3 to move downward to squeeze the elastic member 4, thereby providing resistance training for the user. When the action force applied to the arm 2 disappears, the elastic potential energy generated by the squeezing of the elastic member 4 pushes the slider 3 to reset, and the matching portion K2 of the slider 3 acts on the action portions K1 of the two arms 2, so that the arm 2 is automatically damped and unfolded.
[0058] Compared with conventional similar portable fitness equipment, this embodiment is intuitive in design, easy to assemble, and reduces production costs. Through the hinge design of the upper end of the support arm 2, the longitudinal sliding fit of the slider 3 on the base 1, and the extrusion fit between the support arm 2 and the slider 3, the stability and smoothness during the movement are ensured, the friction and wear between the components are reduced, and even after long-term use, the matching mechanism is still tight and effective, avoiding the failure problem caused by looseness or wear, and ensuring the safety and continuity of training.
[0059] The slider 3 has a large downward space, which means that the user needs to overcome a larger displacement distance when closing the support arm 2, thereby providing a longer compression stroke of the elastic member. This not only increases the difficulty and intensity of training, but also can exercise the user's muscle groups more comprehensively, effectively improving the training effect and user experience.
[0060] like Figure 4-6 As shown, the base 1 includes a shell 11 and a fixed block 12 and a fixed rod 13 in the shell 11. The elastic member 4 is a spring sleeved on the fixed rod 13. The lower end of the fixed rod 13 is provided with a limiting portion 14, and the slider 3 is sleeved on the fixed rod 13, and the spring is located between the limiting portion 14 and the slider 3. Since the spring is directly sleeved on the fixed rod 13, and the slider 3 is also sleeved on the fixed rod 13 and located on the spring, this design makes the connection and assembly between the components extremely simple. Users can complete the assembly without complex tools or professional skills. Similarly, disassembly and maintenance become easy and quick. This not only lowers the threshold for use, but also improves the usability and durability of the product.
[0061] The limiting part 14 provided at the lower end of the fixing rod 13 effectively prevents the spring from excessive deformation or falling off during the compression process, ensuring the stability and reliability of the spring in long-term use. At the same time, the sleeve sliding fit design between the slider 3, the spring and the fixing rod 13 plays a positioning and guiding role for the up and down movement of the slider 3, making the operation smoother.
[0062] It should be noted that by replacing springs with different elastic coefficients, users can easily adjust the resistance during training to suit different fitness goals and physical conditions. This flexible resistance adjustment mechanism enables the fitness equipment to meet the diverse needs of beginners to professional fitness enthusiasts, providing a more personalized and efficient training experience.
[0063] The matching part K2 is an inclined side surface 33 that gradually expands outward from top to bottom on both sides of the slider 3; when the two arms 2 are forced to close, the action part K1 gradually contacts and squeezes the inclined side surface 33 from top to bottom. The design of the inclined side surface 33 allows the action part K1 to gradually contact the inclined side surface 33 of the slider 3 from top to bottom during the closing process of the arm 2. This contact method avoids the sudden increase in resistance in the traditional design and provides users with a smoother and more gradual resistance experience. As the arm 2 further closes, the inclined side surface 33 gradually guides the action part K1 to go deeper, and the resistance gradually increases, so that the user can adapt to and control the training intensity more naturally and reduce the risk of sports injuries. Due to the design of the inclined side surface 33, the user can more finely perceive and regulate the force of the muscle group during the training process. With the different stages of the closing of the arm 2, different muscle groups will be stimulated to different degrees, thereby achieving a more accurate training effect. This design helps users adjust their training strategies according to their own training goals and physical conditions, and improve training efficiency and results. The progressive contact mode of the inclined side surface 33 reduces the instantaneous impact force between the action part K1 and the mating part K2, and reduces the risk of wear and damage between components. This design not only improves the durability of the equipment, but also extends the service life of the overall structure and reduces the maintenance cost for users. In addition, by adjusting the angle or length of the inclined side surface 33, users can further customize the training experience to meet fitness needs at different stages. This design not only increases the flexibility of the product, but also improves user participation and training effects.
[0064] like Figure 4-8 As shown, the slider 3 is a trapezoidal structure that is narrow at the top and wide at the bottom, and the slider 3 includes a bottom surface 31, a top surface 32 and two symmetrical inclined side surfaces 33. The action portion K1 is the inner side surface of the two arms 2. The action portion K1 is located on a convex portion that protrudes toward the inner side of the arm 2, and the convex portion includes a second inclined surface S2 located at the lower side. In this embodiment, the top end of the convex portion is a circular arc segment S1, and the circular arc segment S1 connects the second inclined surface S2. The slider 3 adopts a trapezoidal structure that is narrow at the top and wide at the bottom, so that when the arms 2 are vertically brought together, the inclined side surface 33 of the slider 3 can produce a longer contact path with the inclined surface of the action portion K1.
[0065] In other embodiments, a first inclined surface is further provided on the upper side of the second inclined surface S2, and the slope of the first inclined surface is greater than that of the second inclined surface S2. Preferably, there is an arc transition between the first inclined surface and the second inclined surface S2.
[0066] In particular, when the action portion K1 includes a first inclined surface and a second inclined surface S2 with different slopes, this design further extends the travel of the support arm 2 from the initial position to the fully closed state, which not only improves the training range and effect, but also provides users with a richer training experience.
[0067] The slope of the first inclined surface of the action part K1 is greater than that of the second inclined surface S2. This design makes the resistance gradually increase as the slider 3 slides down the inclined surface during the closing process of the support arm 2. Users can accurately control the training intensity and resistance by adjusting the degree of closing of the support arm 2 according to their own training needs. This progressive resistance adjustment method helps users gradually adapt to and increase the difficulty of training, reducing the risk of sports injuries.
[0068] like Figure 5-7 As shown, the fixing block 12 includes a central portion 121 and mounting cavities 122 on both sides. The upper end of the fixing rod 13 extends into and is fixed to the central portion 121 , and the pin 123 axially connects the upper end of the support arm 2 to the mounting cavity 122 .
[0069] like Figure 6 As shown, the slider 3 is provided with a through hole extending from the bottom surface 31 to the top surface 32, the fixing rod 13 passes through the through hole, and the upper end of the spring is pressed against the bottom surface 31 of the slider 3. This design not only simplifies the assembly process, but also enhances the stability of the structure. When the support arm 2 is closed, the inclined side surface 33 of the slider 3 is tightly fitted with the inclined surface of the convex action part K1, which effectively prevents the support arm 2 from shaking or deflecting, ensuring the accuracy and safety of the training.
[0070] like Figure 5-8 As shown, a guide structure is provided between the support arm 2 and the slider 3; the guide structure includes a ridge T on the inner side of the support arm 2 and a slide groove P on the inner side of the slide groove 3; when the two support arms 2 are forced to close, the ridge T is embedded in the slide groove P; the action portion K1 is located on the inner side of the ridge T, and the matching portion K2 is located at the bottom of the slide groove P. The setting of the guide structure enables the ridge T to always move along the trajectory of the slide groove P during the closing process of the support arm 2, ensuring that the movement trajectory of the support arm 2 during the closing process always meets the design expectations, reducing the accidental detachment or jamming of the support arm 2 during the closing process, and effectively preventing the displacement or shaking of the support arm 2. This design not only improves the stability and accuracy of the training, but also reduces the noise and wear caused by improper contact between components, and extends the service life of the equipment.
[0071] The slider 3 further includes a vertical side surface 34 below the inclined side surface 33 , and the slide groove P extends to the vertical side surface 34 , thereby increasing the height of the slider 3 and the amount of extrusion while improving the guiding effect.
[0072] like Figure 4-7As shown, the lower end of the fixing rod 13 is a threaded section E, and the limiting portion 14 is a knob F that is threadedly matched with the threaded section; the opening amplitude of the two arms 2 and / or the initial potential energy of the spring can be adjusted by the knob F to meet different training needs. Whether it is a fitness enthusiast who needs high-intensity training or an injured person undergoing rehabilitation training, they can find the training angle and intensity that best suits them by simply rotating the knob F. The threaded connection and knob F design are not only easy to adjust, but also ensure the stability and reliability of the structure. During training, even in the face of large external forces, the threaded section and knob F can maintain a close fit to prevent accidental loosening or falling off, thereby ensuring the user's training safety.
[0073] The portable fitness equipment provided by the present invention is introduced. The principle and implementation mode of the present invention are described in this article by using specific examples. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims
1. A portable fitness device, characterized in that: It includes a base, two supporting arms, a sliding block and an elastic member; The upper end of the support arm is hinged to both sides of the base, and the lower end of the support arm can be close to or away from the base; The base is longitudinally slidably provided with a slider located between the two arms, and an elastic member is provided below the slider; The inner side of the support arm is provided with an action portion, and the slider is provided with a matching portion; When the two arms are forced to close, the action parts of the two arms act on the matching parts of the slider and push the slider to move downward to squeeze the elastic member.
2. The portable fitness device according to claim 1, characterized in that: The base includes a fixed block and a fixed rod, and the elastic member is a spring sleeved on the fixed rod; A limiting portion is provided at the lower end of the fixing rod, the sliding block is sleeved on the fixing rod, and the spring is located between the limiting portion and the sliding block.
3. The portable fitness device according to claim 1, characterized in that: The matching portion is an inclined side surface on both sides of the slider that gradually expands outward from top to bottom; When the two arms are forced to close, the action portion gradually contacts and presses the inclined side surface from top to bottom.
4. The portable fitness device according to claim 3, characterized in that: The action portion is located on a convex portion protruding toward the inner side of the support arm, and includes a first inclined surface and a second inclined surface from top to bottom; the slope of the first inclined surface is greater than that of the second inclined surface.
5. The portable fitness device according to claim 3, characterized in that: A guide structure is provided between the support arm and the slider; the guide structure includes a convex ridge on the inner side of the support arm and a slide groove on the inner side of the slide groove; when the two support arms are closed under force, the convex ridge is embedded in the slide groove; the action portion is located on the inner side surface of the convex ridge, and the matching portion is located at the bottom of the slide groove.
6. The portable fitness device according to claim 5, characterized in that: The sliding block further includes a vertical side surface below the inclined side surface, and the sliding groove extends to the vertical side surface.
7. The portable fitness equipment according to claim 1, characterized in that: The lower end of the fixing rod is a threaded section, and the limiting portion is a knob threadably matched with the threaded section; the opening range of the two arms and / or the initial potential energy of the spring can be adjusted by the knob.
8. A portable fitness device, characterized in that: It includes a fixed block, a fixed rod, two supporting arms, a sliding block and a spring; The upper end of the fixing rod is fixedly connected to the middle position of the fixing block; the lower end of the fixing rod is provided with a limiting portion; The upper ends of the two supporting arms are respectively axially connected to one side of the fixed block; The slider is slidably arranged on the fixed rod; the spring is sleeved on the fixed rod between the slider and the limiting part; when the two arms are forced to close, the inner sides of the two arms contact and act on the outer side of the slider which is narrow at the top and wide at the bottom, pushing the slider to move along the lower end of the fixed rod, thereby compressing the spring.
9. The portable fitness device according to claim 8, characterized in that: The slider is a trapezoidal structure that is narrow at the top and wide at the bottom. The slider includes a bottom surface, a top surface, and two symmetrical inclined side surfaces. The slider is provided with a through hole extending from the bottom surface to the top surface, and the fixing rod passes through the through hole. The upper end of the spring is pressed against the bottom surface of the slider; when the two arms are forced to close, the inner side surfaces of the arms press against the inclined side surfaces of the slider, pushing the slider to move downward along the fixing rod.
10. The portable fitness device according to claim 9, characterized in that: A guide structure is provided between the inner side surface of the support arm and the inclined side surface of the slide block; The guide structure comprises a convex ridge on the inner side surface of the support arm and a sliding groove on the inclined side surface of the sliding block.
11. The portable fitness equipment according to claim 8, characterized in that: The lower end of the fixing rod is a threaded section, and the limiting part is a knob, which is adjustably screwed on the threaded section; the opening range of the two arms and / or the initial potential energy of the spring can be adjusted by the knob.
12. A portable fitness device, characterized in that: It includes a fixed block, a fixed rod, two supporting arms, a sliding block and a spring; The fixing block includes a central portion and mounting cavities on both sides, the upper end of the fixing rod extends into and is fixed to the central portion, and the pin axially connects the upper end of the support arm to the mounting cavity; The lower end of the fixing rod is provided with a threaded section, and the knob is adjustably screwed on the threaded section; The spring is slidably mounted on the fixed rod between the slider and the knob; The slider is in a trapezoidal structure that is narrow at the top and wide at the bottom, and comprises a bottom surface, a top surface, and two symmetrical inclined side surfaces; The slider is provided with a through hole extending from the bottom surface to the top surface, and the fixing rod passes through the through hole; When the two arms are forced to close, the inner sides of the two arms contact and act on the inclined side of the slider, pushing the slider to move along the lower end of the fixing rod, thereby compressing the spring.