A support foot

Abstract

The present invention relates to a support foot, comprising: a support tube; an upper end cover, inserted into the upper port of the support tube; a spring, arranged in the support tube; a movable plug, arranged in the lower inner part of the support tube, with a plug-in hole on the lower surface and an annular protrusion on the outer wall; a lower end cover, comprising a plug-in block and a connecting block, the plug-in block is inserted into the lower port of the support tube, the connecting block is located outside the support tube, and the connecting block is provided with a plug-in channel; a support rod, arranged vertically, the upper end of the support rod extends into the plug-in hole of the movable plug through the plug-in channel, the lower end of the support rod is located outside the plug-in channel of the lower end cover, and the lower end of the support rod is connected to a horizontally arranged support seat. The support foot structure is reasonably designed, so that the supported object can automatically adjust to be stable without shaking, and the automatic adjustment balance can still be completed after the supported object is actively or passively moved.

Description

Technical Field

[0001] The invention belongs to the technical field of supporting feet, and in particular relates to a supporting foot. Background Art

[0002] At present, fixed bases are used in the four-point support structure in China. Since three points determine the surface, when there is a fourth point, one of the points will inevitably be on the same surface. Therefore, users need to manually adjust the fixed base before use to ensure that the support structure is stable and without shaking.

[0003] The principle of the automatic adjustment foot is to use the spring force to reset and the friction damping to automatically adjust the support structure. After the automatic adjustment, the friction damping will limit the slight movement caused by the spring reset force. In actual use, the automatic adjustment foot can automatically adjust the support structure to be stable in any situation of movement of the supported object.

[0004] Some foreign manufacturers use plastic pipes, which are inferior to metal pipes in terms of strength and precision. In addition, plastic pipes are prone to aging, so the life problem cannot be well solved and eventually fail. Summary of the invention

[0005] The object of the present invention is to provide a support foot to solve the problems of short service life and poor strength of the existing support foot structure.

[0006] To achieve the above-mentioned purpose, the present invention provides a support foot, which has a reasonable structural design so that the supported object can automatically adjust to be stable without shaking, and can still automatically adjust the balance after the supported object moves actively or passively.

[0007] Specifically, the technical solution adopted by the present invention is:

[0008] A support foot comprises: a support tube, which is vertically arranged; an upper end cover, which is inserted into the upper port of the support tube; a spring, which is vertically arranged in the support tube, and the upper end of the spring abuts against the upper end surface of the upper end cover; a movable plug, which is vertically and slidably arranged at the lower inner part of the support tube, and the middle part of the lower surface of the movable plug is provided with a plug-in hole in the vertical direction, and an annular protrusion is protruded along the circumference of the movable plug on the outer wall of the movable plug near the lower open end of the plug-in hole, and the lower end of the spring abuts against the annular protrusion; a lower end cover, the lower end The end cover includes a plug-in block and a connecting block vertically protruding from the middle of the lower surface of the plug-in block, the lower end cover is plugged into the lower port of the support tube through the plug-in block, the connecting block of the lower end cover is located on the outside of the support tube, and a plug-in channel is vertically opened in the middle of the lower surface of the connecting block, which passes through the lower end cover, and the plug-in channel is coaxial with the plug-in hole of the movable plug; a support rod is vertically arranged, the upper end of the support rod extends from the plug-in channel into the plug-in hole of the movable plug, the lower end of the support rod is located on the outside of the plug-in channel of the lower end cover, and the lower end of the support rod is connected to a horizontally arranged support seat.

[0009] Furthermore, a protrusion is provided in the middle of the end surface of the inner end of the upper end cover extending into the support tube upper port in the vertical direction, and the upper end of the spring is sleeved on the protrusion; a groove is provided in the middle of the surface of the protrusion in the vertical direction; an annular groove corresponding to the groove is provided on the upper surface of the movable plug along the outer circumference of the movable plug, and the outer diameter of the annular groove corresponds to the inner diameter of the groove.

[0010] Furthermore, the outer wall of the support tube near the upper port is recessed inward along the circumference of the support tube to form an annular upper clamping protrusion on the inner wall of the support tube; the outer wall of the upper end cover extending into the inner end of the support tube is provided with an upper groove matching the upper clamping protrusion along the circumference of the upper end cover; the upper end cover is connected to the upper clamping protrusion of the support tube through the upper groove, forming a riveted connection between the upper end cover and the support tube.

[0011] Furthermore, a plurality of connection protrusions are provided on the lower end surface of the movable plug located outside the lower opening end of the plug hole at intervals along the circumference of the movable plug; and a connection slot corresponding to the connection protrusion is provided on the upper end surface of the lower end cover.

[0012] Furthermore, an internal thread is provided on the upper inner wall of the plug-in hole of the movable plug along the length direction of the movable plug; an external thread is provided on the upper outer wall of the support rod along the length direction of the support rod; the support rod is inserted into the plug-in hole, and the external thread of the support rod cooperates with the internal thread of the plug-in hole to adjust the length of the support rod extending into the movable plug.

[0013] Furthermore, an annular boss is provided in the middle part of the outer wall of the movable plug in the circumferential direction of the movable plug in the length direction, and the annular boss, the annular protrusion and the outer wall of the movable plug located between the annular boss and the annular protrusion cooperate to form an I-shaped structure; the outer wall of the movable plug located between the annular boss and the annular protrusion is covered with a friction strip, and the outer wall of the movable plug is in contact with the inner wall of the support tube through the friction strip; the friction strip is soaked with grease; and the inner wall of the support tube is coated with a grease layer.

[0014] Furthermore, the outer wall of the support tube near the lower port is recessed inward along the circumference of the support tube to form an annular lower clamping protrusion on the inner wall of the support tube; the outer wall of the plug-in block of the lower end cover is provided with a lower groove matching the lower clamping protrusion along the circumference of the plug-in block; the plug-in block of the lower end cover is connected to the lower clamping protrusion of the lower port of the support tube through the lower groove, forming a riveted connection between the lower end cover and the support tube.

[0015] Furthermore, the support seat is covered with a buffer sleeve.

[0016] Furthermore, the vertical distance H between the upper surface of the support seat and the lower end surface of the connecting block of the lower end cover is less than the compression stroke of the spring; the length S of the gap between the upper end surface of the plug-in block and the lower surface of the movable plug is equal to the compression stroke of the spring.

[0017] Furthermore, a locking nut is sleeved on the outer wall of the connecting block of the lower end cover, and the locking nut is used to adjust the length of H.

[0018] The beneficial effects of the present invention are:

[0019] By arranging a movable plug in the support tube, the movable plug is elastically connected with the upper end cover through a spring, and the support rod extends from the lower end of the support tube into the support tube and is inserted into the movable plug, and the support rod-movable plug-spring-upper end cover and the support tube cooperate to form support for the object;

[0020] The movable connection between the movable plug, the spring and the upper end cover enables the support foot to support the supported object. When the ground is uneven or the supported object is tilted, the gravity of the supported object and the rebound force of the spring can be used to move the support rod and the movable plug in the support tube and compress the spring, thereby shortening the total length of the support foot. In cooperation with other fixed feet, the supported object can quickly maintain balance on an uneven ground (such as a high protrusion on the ground or a stair step), achieving the purpose of automatic balance adjustment without the need for manual adjustment by the user, and providing a good user experience.

[0021] The various parts of the support foot are easy to assemble, have good coordination stability, can provide strong support for the supported object, and have a long service life;

[0022] The support foot utilizes the spring rebound force and the interference fit between the friction strip and the support tube. The friction strip wraps the movable plug and moves relative to the support tube to generate friction damping force, thereby automatically adjusting the balance of the supported object and limiting the up and down movement of the supported object by friction damping. The upper end cover provides a reaction force for the spring, the spring rebound force is downward, and the support rod and the support seat cooperate to provide an upward force to support the gravity of the supported object. The greater the gravity of the supported object, the greater the force on the spring. The assembly is fixed to the supported object using a nut, and the nut, the support rod and the support seat are subject to the gravity of the supported object. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a support foot provided in Example 1 of the present invention;

[0024] Figure 2 for Figure 1 BB section view;

[0025] Figure 3 for Figure 1 Explosion diagram of

[0026] Among them, 1, support tube, 11, upper port, 12, lower port, 13, upper clamping protrusion, 14, lower clamping protrusion;

[0027] 2. upper end cover, 21. raised portion, 22. recess, 23. upper groove;

[0028] 3. Spring;

[0029] 4. movable plug, 41. plug hole, 42. annular protrusion, 43. annular groove, 44. connecting protrusion, 45. internal thread, 46. annular boss, 47. friction strip;

[0030] 5. lower end cover, 51. plug-in block, 52. connection block, 54. connection slot, 55. lower groove, 56. locking nut;

[0031] 6. Support rod, 61. Support seat, 62. External thread, 63. Buffer sleeve. DETAILED DESCRIPTION

[0032] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content. Example

[0034] See also Figures 1 to 3 The present invention provides a support foot, characterized in that it comprises: a support tube 1, which is vertically arranged; an upper end cover 2, which is inserted into the upper port 11 of the support tube 1; a spring 3, which is vertically arranged in the support tube 1, and the upper end of the spring 3 abuts against the end surface of the upper end cover 2 extending into the inner end of the support tube 1; a movable plug 4, which is vertically and slidably arranged in the lower inner part of the support tube 1, and a plug hole 41 is provided in the middle of the lower surface of the movable plug 4 along the vertical direction, and an annular protrusion 42 is protruded on the outer wall of the movable plug 4 near the lower open end of the plug hole 41 along the circumference of the movable plug 4, and the lower end of the spring 3 abuts against the annular protrusion 42; The lower end cover 5 includes a plug-in block 51 and a connecting block 52 vertically protruding from the middle of the lower surface of the plug-in block 51. The lower end cover 5 is plugged into the lower port 12 of the support tube 1 through the plug-in block 51. The connecting block 52 of the lower end cover 5 is located on the outside of the support tube 1. A plug-in channel that passes through the lower end cover 5 is provided in the middle of the lower surface of the connecting block 52 in the vertical direction. The plug-in channel is coaxial with the plug-in hole 41 of the movable plug 4. The support rod 6 is vertically arranged. The upper end of the support rod 6 extends into the plug-in hole 41 of the movable plug 4 from the plug-in channel. The lower end of the support rod 6 is located on the outside of the plug-in channel of the lower end cover 5. The lower end of the support rod 6 is connected to a horizontally arranged support seat 61.

[0035] Furthermore, a protrusion 21 is protruded in the vertical direction at the middle of the end surface of the upper end cover 2 extending into the inner end of the upper port 11 of the support tube 1, and the upper end of the spring 3 is sleeved on the protrusion 21; a groove 22 is provided in the vertical direction at the middle of the surface of the protrusion 21; an annular groove 43 corresponding to the groove 22 is provided on the upper surface of the movable plug 4 along the outer circumference of the movable plug 4, and the outer diameter of the annular groove 43 corresponds to the inner diameter of the groove 22.

[0036] The groove 22 serves as a relief. The groove 22 cooperates with the annular groove 43 to form an extra space in the groove 22 to prevent the upper end surface of the movable plug 4 from hitting the lower end surface of the upper end cover 2 .

[0037] Furthermore, the outer wall of the support tube 1 near the upper end port is recessed inward along the circumference of the support tube 1 to form an annular upper clamping protrusion 13 on the inner wall of the support tube 1; the outer wall of the upper end cover 2 extending into the inner end of the support tube 1 is provided with an upper groove 23 matching the upper clamping protrusion 13 along the circumference of the upper end cover 2; the upper end cover 2 is connected to the upper clamping protrusion 13 of the support tube 1 through the upper groove 23, forming a riveted connection between the upper end cover 2 and the support tube 1.

[0038] The matching design of the upper clamping protrusion 13 and the upper groove 23 forms a riveted connection between the upper end cover 2 and the upper end of the support tube 1, thereby ensuring the stability and firmness of the connection and assembly between the upper end cover 2 and the support tube 1.

[0039] Furthermore, an internal thread 45 is provided on the upper inner wall of the plug hole 41 of the movable plug 4 along the length direction of the movable plug 4; an external thread 62 is provided on the upper outer wall of the support rod 6 along the length direction of the support rod 6; the support rod 6 is inserted into the plug hole 41, and the external thread 62 of the support rod 6 is threadably matched with the internal thread 45 of the plug hole 41, so as to adjust the length of the support rod 6 extending into the movable plug 4.

[0040] The matching design of the internal thread 45 and the external thread 62 can ensure the stability of the connection between the support rod 6 and the movable plug 4, and can adjust the length of the support rod 6 extending into the movable plug 4, thereby adjusting the relative length between the support base and other fixed bases, thereby ensuring the stability of the overall support of the support base when the supported object (such as a washing machine) is greatly unbalanced.

[0041] Furthermore, an annular boss 46 is provided at the middle part of the outer wall of the movable plug 4 in the length direction along the circumference of the movable plug 4, and the annular boss 46, the annular protrusion 42 and the outer wall of the movable plug 4 located between the annular boss 46 and the annular protrusion 42 cooperate to form an I-shaped structure; the outer wall of the movable plug 4 located between the annular boss 46 and the annular protrusion 42 is covered with a friction strip 47, and the outer wall of the movable plug 4 is in contact with the inner wall of the support tube 1 through the friction strip 47; the friction strip 47 is soaked with grease (not shown); the inner wall of the support tube 1 is coated with a grease layer (not shown).

[0042] A friction strip 47 is added to the I-shaped structure of the movable plug 4. The friction strip 47 rubs against the inner wall of the support tube 1 to generate damping, which is used to overcome the rebound force of the spring 3. When the supported object vibrates slightly, it can still maintain balance. The design of the I-shaped structure can prevent the friction strip 47 from falling off, thereby ensuring efficiency.

[0043] Furthermore, the outer wall of the support tube 1 near the lower port is recessed inward along the circumference of the support tube 1 to form an annular lower clamping protrusion 14 on the inner wall of the support tube 1; the outer wall of the plug-in block 51 of the lower end cover 5 is provided with a lower groove 55 that cooperates with the lower clamping protrusion 14 along the circumference of the plug-in block 51; the plug-in block 51 of the lower end cover 5 is connected to the lower clamping protrusion 14 of the lower port 12 of the support tube 1 through the lower groove 55, forming a riveted connection between the lower end cover 5 and the support tube 1.

[0044] The matching design of the lower clamping protrusion 14 and the lower groove 55 forms a riveted connection between the lower end cover 5 and the lower end port 12 of the support tube 1, ensuring the stability and firmness of the connection and assembly between the lower end cover 5 and the support tube 1.

[0045] Furthermore, the support seat 61 is covered with a buffer sleeve 63 .

[0046] The design of the buffer sleeve 63 can provide buffering for the support seat 61 and increase the service life.

[0047] Furthermore, the vertical distance H between the upper surface of the support seat 61 and the lower end surface of the connecting block 52 of the lower end cover 5 is smaller than the compression stroke of the spring 3;

[0048] The length S of the gap between the upper end surface of the plug block 51 and the lower surface of the movable plug 4 is equal to the compression stroke of the spring 3 .

[0049] Among them, H is the stroke designed according to customer needs, S is 0 in the free state (that is, the lower end surface of the movable plug 4 is connected to the upper end surface of the lower end cover 5), S is a variable value, and S value = spring compressible stroke.

[0050] Furthermore, a locking nut 56 is sleeved on the outer wall of the connecting block 52 of the lower end cover 5, and the locking nut 56 is used to adjust the length of H.

[0051] Assume that H=15mm and the compression stroke of spring 3 is 20mm, that is, after actual assembly, when H=0, spring 3 still has a remaining compression stroke of 5mm, which is not allowed. At this time, it is necessary to adjust the locking nut 56 to increase the H value. H can become 18mm, which relatively reduces the remaining compression stroke of spring 3 and ensures the stability of the support foot.

[0052] The present invention provides a method for assembling a support foot as follows:

[0053] First, expand the ends of the support tube 1, form an upper clamping protrusion 13 on the inner wall of the upper port 11, and form a lower clamping protrusion 14 on the inner wall of the lower port 12, place the upper end cover 2 in the upper port 11 of the support tube 1, and use spin riveting to connect the upper groove 23 of the upper end cover 2 with the upper clamping protrusion 13 of the support tube 1, then inject a certain amount of grease into the inner wall of the support tube 1 to form a grease layer, insert the spring 3 into the support tube 1, and then wrap the friction strip 47 soaked with a certain amount of grease. Wrap the I-shaped structure of the movable plug 4, insert the movable plug 4 into the support tube 1 from the lower port 12, and finally place the lower end cover 5 in the support tube 1, and use spin riveting to connect the lower groove 55 of the lower end cover 5 with the lower clamping protrusion 14 of the support tube 1 to form a whole for standby use, screw the locking nut 56 into the connecting block 52 of the lower end cover 5 in the standby assembly again, and finally pass the support rod 6 through the lower end cover 5 and screw it into the plug hole 41 of the movable plug 4 to complete the assembly.

[0054] The support tube 1 is a metal tube, and the buffer sleeve 63 is rubber-coated.

[0055] Taking the supported object supported by four feet as an example, a method for using the supporting feet provided by the present invention is as follows:

[0056] When in use, 1 to 2 of the four feet of the supported object adopt the supporting feet provided by the present invention, and the other 2 to 3 feet are fixed-length feet. When the supported object encounters a height difference in the ground during transportation or movement, the support rod 6 can drive the movable plug 4 to move in the support tube 1 toward the upper end cover 2, thereby shortening the overall length of the supporting feet, so that the shortened length of the supporting feet + the height difference = the fixed foot length, thereby ensuring the balance of the supported object. The entire process does not require manual adjustment by the user, effectively improving the user experience.

[0057] The support foot utilizes the rebound force of the spring 3 and the interference fit between the friction strip 47 and the support tube 1. The friction strip 47 wraps the movable plug 4 and moves relative to the support tube 1 to generate friction damping force, thereby automatically adjusting the balance of the supported object and limiting the up and down movement of the supported object by friction damping. The upper end cover 2 provides a reaction force for the spring 3. The rebound force of the spring 3 is downward. The support rod 6 and the support seat 61 cooperate to provide an upward force to support the gravity of the supported object. The greater the gravity of the supported object, the greater the force on the spring 3. The assembly is fixed to the supported object using a nut, and the nut, the support rod and the support seat are subject to the gravity of the supported object. Example

[0058] A plurality of connection protrusions 44 are provided on the lower end surface of the movable plug 4 outside the lower open end of the plug hole 41 at circumferential intervals along the movable plug 4; a connection slot 54 corresponding to the connection protrusion 44 is provided on the end surface of the lower end cover 5 extending into the inner end of the support tube 1.

[0059] The matching design of the connecting protrusion 44 and the connecting slot 54 ensures the stability of the movable plug 4 after docking with the lower end cover 5, and prevents the movable plug 4 from rotating in the support tube 1, thereby ensuring the movable plug 4 moves axially along the support tube 1.

[0060] The rest is the same as in Example 1.

[0061] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention, or a certain functional module can be deleted. Therefore, these modifications, improvements or deletions made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A support foot, characterized in that: include: A support tube (1) is arranged vertically; An upper end cover (2), the upper end cover (2) being inserted into an upper port (11) of the support tube (1); A spring (3) is vertically arranged in the support tube (1), and the upper end of the spring (3) abuts against the end surface of the upper end cover (2) extending into the inner side of the support tube (1); A movable plug (4), the movable plug (4) being vertically and slidably arranged at the lower inner part of the support tube (1), a plug hole (41) being provided in the middle of the lower surface of the movable plug (4) along the vertical direction, an annular protrusion (42) being provided on the outer wall of the movable plug (4) near the lower opening end of the plug hole (41) along the circumference of the movable plug (4), and the lower end of the spring (3) being in contact with the annular protrusion (42); A lower end cover (5), the lower end cover (5) comprising a plug-in block (51) and a connecting block (52) vertically protruding from the middle of the lower surface of the plug-in block (51), the lower end cover (5) being plugged into the lower port (12) of the support tube (1) through the plug-in block (51), the connecting block (52) of the lower end cover (5) being located outside the support tube (1), a plug-in channel penetrating the lower end cover (5) being provided in the middle of the lower surface of the connecting block (52) in a vertical direction, the plug-in channel being coaxial with the plug-in hole (41) of the movable plug (4); A support rod (6) is arranged vertically, the upper end of the support rod (6) extends from the insertion channel into the insertion hole (41) of the movable plug (4), the lower end of the support rod (6) is located outside the insertion channel of the lower end cover (5), and the lower end of the support rod (6) is connected to a horizontally arranged support seat (61); A protrusion (21) is provided in the middle of the end surface of the upper end cover (2) extending into the inner end of the upper port (11) of the support tube (1) in the vertical direction, and the upper end of the spring (3) is sleeved on the protrusion (21); A groove (22) is formed in the middle of the surface of the protruding portion (21) along the vertical direction; An annular groove (43) corresponding to the groove (22) is formed on the upper surface of the movable plug (4) along the outer circumference of the movable plug (4), and the outer diameter of the annular groove (43) corresponds to the inner diameter of the groove (22); A plurality of connection protrusions (44) are provided on the lower end surface of the movable plug (4) located outside the lower opening end of the plug hole (41) and are spaced apart along the circumference of the movable plug (4); A connection slot (54) corresponding to the connection protrusion (44) is provided on the end surface of the lower end cover (5) extending into the inner end of the support tube (1); An internal thread (45) is provided on the upper portion of the inner wall of the plug hole (41) of the movable plug (4) along the length direction of the movable plug (4); An outer thread (62) is provided on the upper portion of the outer wall of the support rod (6) along the length direction of the support rod (6); The support rod (6) is inserted into the insertion hole (41), and the external thread (62) of the support rod (6) is threadably matched with the internal thread (45) of the insertion hole (41), thereby adjusting the length of the support rod (6) extending into the movable plug (4); An annular boss (46) is provided at the middle of the length direction of the outer wall of the movable plug (4) along the circumference of the movable plug (4), and the annular boss (46), the annular protrusion (42) and the outer wall of the movable plug (4) located between the annular boss (46) and the annular protrusion (42) cooperate to form an I-shaped structure; The outer wall of the movable plug (4) located between the annular boss (46) and the annular protrusion (42) is coated with a friction strip (47), and the outer wall of the movable plug (4) contacts the inner wall of the support tube (1) through the friction strip (47); The friction strip (47) is soaked in grease; the inner wall of the support tube (1) is coated with a grease layer; The support seat (61) is covered with a buffer sleeve (63).

2. The support foot according to claim 1, characterized in that: The outer wall of the support tube (1) near the upper end port is concave inwardly along the circumference of the support tube (1) to form an annular upper clamping protrusion (13) on the inner wall of the support tube (1); An outer wall of the upper end cover (2) extending into the inner end of the support tube (1) is provided with an upper groove (23) cooperating with the upper clamping protrusion (13) along the circumference of the upper end cover (2); The upper end cover (2) is connected to the upper clamping protrusion (13) of the support tube (1) via the upper groove (23), thereby forming a riveted connection between the upper end cover (2) and the support tube (1).

3. The support foot according to claim 1, characterized in that: The outer wall of the support tube (1) near the lower port is concave inwardly along the circumference of the support tube (1) to form an annular lower clamping protrusion (14) on the inner wall of the support tube (1); The outer wall of the plug-in block (51) of the lower end cover (5) is provided with a lower groove (55) along the circumference of the plug-in block (51) and is matched with the lower clamping protrusion (14); The plug-in block (51) of the lower end cover (5) is connected to the lower clamping protrusion (14) of the lower port (12) of the support tube (1) via the lower groove (55), thereby forming a riveted connection between the lower end cover (5) and the support tube (1).

4. The support foot according to claim 1, characterized in that: A vertical distance H between an upper surface of the support seat (61) and a lower end surface of a connecting block (52) of the lower end cover (5) is smaller than a compression stroke of the spring (3); The length S of the gap between the upper end surface of the plug-in block (51) and the lower surface of the movable plug (4) is equal to the compression stroke of the spring (3).

5. The support foot according to claim 4, characterized in that: The outer wall of the connecting block (52) of the lower end cover (5) is sleeved with a locking nut (56), and the locking nut (56) is used to adjust the length of H.

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