Top-driven jack

Abstract

The top-driven jack comprises an outer pipe, an inner pipe, a lead screw, a nut, a fixing part and a handle, the inner pipe stretches into the outer pipe, the nut is fixedly installed on the inner pipe, the lead screw is movably installed in the outer pipe through the fixing part and stretches into the inner pipe, the lead screw is connected with the nut in a meshed mode, the fixing part comprises a fixing base and a movable sleeve, and the movable sleeve is sleeved with the fixing base. A connecting hole and a containing hole are formed in the movable sleeve, a connecting section is arranged at one end of the lead screw, the movable sleeve is movably connected with the fixing base, and the movable sleeve is embedded into the connecting hole through the connecting section and synchronously moves along with the lead screw in the circumferential direction around the center line of the lead screw. The movable sleeve is completely separated from the connecting hole through the connecting section and is located in the containing hole, and the movable sleeve and the lead screw asynchronously move in the circumferential direction around the center line of the lead screw. When the top-driven jack is switched between manual operation and electric operation, parts are not disassembled and assembled, and the switching between the manual operation and the electric operation is realized through the clutch structure with stable working performance.

Description

Technical Field

[0001] The utility model relates to a top-driven jack. Background Art

[0002] After the trailer or RV is parked steadily at the station, the body of the trailer or RV needs to use a jack to provide the main support force. The jack can be adjusted freely. If the outdoor terrain conditions cannot provide a flat parking area, the jack can be extended or shortened to adapt to the support height required for leveling. The jack is usually used by hand. A handle is set on the top of the jack. When the handle is held and shaken in the direction of rotation, the telescopic structure inside the jack changes accordingly, and the overall extension or shortening of the jack is finally achieved. Manually operating the jack has the disadvantage of being laborious to use. In order to reduce the labor intensity when using a jack, the prior art discloses a technical solution that allows an electric tool to drive the jack. In the technical solution, the handle is not fixedly mounted on the screw of the jack, but can be quickly disassembled and installed on the screw of the jack. The cross-section of the part of the screw connected to the handle is a regular hexagon, and the size of the regular hexagon matches the size of the hexagonal hole of the sleeve on the electric tool. When manual cranking is required, the handle can be ensured to be combined with the jack. When the electric tool is required to drive, the handle can be removed and the screw can be inserted into the sleeve of the electric tool. Although switching between manual operation and electric operation can be achieved, the disassembly of the handle brings other use defects. The handle is very easy to fall off due to vibration during vehicle driving, or the handle needs to be stored after being removed, which brings inconvenience. The prior art jack needs to disassemble the handle to switch between manual operation and electric operation. Summary of the invention

[0003] The technical problem to be solved by the utility model is how to avoid disassembling and assembling parts when switching between manual operation and electric operation of the jack, thereby obtaining a top-driven jack with high product integrity and stable structure.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: the top-driven jack includes an outer tube, an inner tube, a screw, a nut, a fixing component, and a handle. The inner tube extends into the outer tube, the nut is fixedly installed on the inner tube, the screw is movably installed in the outer tube through the fixing component and the screw extends into the inner tube, the screw is meshed and connected with the nut, the fixing component includes a fixing seat, a movable sleeve, a spring, a bearing, and a limit pin, the fixing seat is fixedly connected with the outer tube, the fixing seat is provided with a pin hole, an assembly hole, a cylindrical chamber, an upper annular chamber, a lower annular chamber, and a connecting groove, the cylindrical chamber is connected with the assembly hole and the center line of the cylindrical chamber coincides with the center line of the assembly hole, the cylindrical chamber is located above the assembly hole, The pin hole is perpendicular to the assembly hole, the diameter of the cylindrical chamber is larger than the diameter of the assembly hole, the inner diameter of the upper annular chamber and the inner diameter of the lower annular chamber are equal to the diameter of the cylindrical chamber, the upper annular chamber is located at the upper end of the cylindrical chamber and is connected to the cylindrical chamber, the lower annular chamber is located at the lower end of the cylindrical chamber and is connected to the cylindrical chamber, the connecting groove is straight, one end of the connecting groove is connected to the upper annular chamber, the other end of the connecting groove is connected to the lower annular chamber, the side of the connecting groove is connected to the cylindrical chamber, the screw rod passes through the assembly hole, one end of the limit pin is inserted into the pin hole, the screw rod is provided with a limit groove, the limit groove is annular around the center line of the screw rod, the limit pin The other end is embedded in the limiting groove, the screw rod is provided with a flange, the bearing is installed on the screw rod and is located between the flange and the fixed seat, the flange is located above the nut, the movable sleeve is provided with a cylindrical portion, and the movable sleeve is provided with a limiting column on the surface of the cylindrical portion, the handle is installed on the movable sleeve, and a connecting hole and a receiving hole are provided inside the movable sleeve, the connecting hole and the receiving hole are connected and the center line of the connecting hole coincides with the center line of the receiving hole, the receiving hole is located above the connecting hole, the minimum width of the receiving hole is greater than the maximum width of the connecting hole, the cross-section of the connecting hole is a non-center symmetrical structure, and a connecting section is provided at one end of the screw rod, the cross-section of the connecting section is a non-center symmetrical structure, and the cross-section structure of the connecting section corresponds to the connecting hole. The cross-sectional structure of the connecting hole, the connecting section of the screw rod extends into the movable sleeve, the end of the screw rod provided with the connecting section passes through the cylindrical chamber, the center line of the screw rod coincides with the center line of the cylindrical chamber, the connecting section protrudes outside the fixed seat, the cylindrical part of the movable sleeve extends into the cylindrical chamber, the movable sleeve is movably connected to the fixed seat, the screw rod is movably connected to the movable sleeve, the spring is installed on the screw rod and is located between the movable sleeve and the fixed seat, the movable range of the cylindrical part of the movable sleeve intersects with the cylindrical chamber, the movable range of the limit column is located in the upper annular chamber, the lower annular chamber, and the connecting groove, the movable sleeve is embedded in the connecting hole through the connecting section and moves synchronously with the screw rod in the circumferential direction around the center line of the screw rod,The movable sleeve is completely separated from the connecting hole by the connecting section and is located in the receiving hole, and moves asynchronously with the screw rod in the circumferential direction around the center line of the screw rod.

[0005] In this technical solution, the fixed component has a clutch function, the movable sleeve can change the relative position inside the fixed seat and can maintain the position, the movable sleeve is movably connected to the screw and after changing the position of the movable sleeve relative to the screw, a connection relationship between the movable sleeve and the screw in the circumferential direction around the center line of the screw can be established. A clutch structure is constructed between the movable sleeve, the fixed seat, and the screw rod. After the movable sleeve moves toward the outside of the fixed seat, the inside of the movable sleeve and the screw rod are connected through a non-centrally symmetrical cross-section. At this time, the movable sleeve is embedded in the connecting hole through the connecting section and moves synchronously with the screw rod in the circumferential direction around the center line of the screw rod, and the driving handle drives the jack. After the movable sleeve moves toward the inside of the fixed seat, the inside of the movable sleeve and the screw rod obtain freedom in the direction along the center line of the screw rod and in the circumferential direction around the center line of the screw rod. At this time, the movable sleeve is completely separated from the connecting hole through the connecting section and is located in the accommodating hole. It moves asynchronously with the screw rod in the circumferential direction around the center line of the screw rod. The movable sleeve can rotate independently of the screw rod, and the two do not interfere with each other. After the driving handle is used, the jack will not be driven. After the connecting section of the screw rod is docked through the sleeve of the electric tool, the jack can be driven by the electric tool. Therefore, the switching between manual operation and electric operation of the jack in this technical solution does not involve the disassembly and assembly of parts.

[0006] The clutch function in this technical solution is stable. The interior of the fixed seat is provided with movable spaces corresponding to the switching positions of the movable sleeve, namely, an upper annular chamber, a lower annular chamber, and a connecting groove. The direction of the force driving the screw to rotate is not along the center line of the screw, but perpendicular to the center line of the screw. The spring always presses the movable sleeve in the direction toward the outside of the fixed seat along the center line of the screw. The movable sleeve can maintain a connection relationship that is only stationary relative to the fixed seat or only stationary relative to the screw. Therefore, when the screw is driven by a normal hand crank or an electric tool, the relative position of the movable sleeve in the fixed seat will not change, which allows the clutch function to be stably exerted. It should be emphasized that after the movable sleeve moves toward the inside of the fixed seat, the position limit inside the movable sleeve is not affected by the screw, that is, the screw cannot limit the position of the movable sleeve on the fixed seat, and the position of the movable sleeve on the fixed seat is always constrained by the fixed seat.

[0007] The receiving hole of the movable sleeve is larger than the connecting hole. When the connecting section of the screw rod is in the receiving hole, there is a gap between the connecting section of the screw rod and the movable sleeve. This gap can accommodate the socket of the electric tool. At this time, the socket is not connected to the movable sleeve. The purpose of this design is to consider that the electric operation mode should be unique, that is, to encourage the electric tool to drive the jack after combining the specified socket; if the connecting section is located outside the movable sleeve, the electric tool may be combined with other non-specified sockets to try to drive the jack. At this time, it is very likely that the wrong type of socket will slip with the connecting section, and the reasonable structure of the connecting section will be destroyed by incorrect operation, which is not conducive to long-term normal use. Therefore, with the design of the movable sleeve surrounding the connecting section, the purpose of urging the use of the correct type of socket can be achieved.

[0008] The frequency of switching between manual operation and electric operation is very low in the entire working cycle of the jack, and there is no need for frequent switching in actual working conditions. Therefore, the clutch structure in this technical solution supports switching between manual operation and electric operation, but does not support the situation where the switching frequency between manual operation and electric operation is too high. In order to ensure smooth switching, two connecting grooves symmetrically distributed relative to the center line of the cylindrical chamber are provided inside the fixing seat. In this way, the limit column of the movable sleeve can be rotated at most 180 degrees to align with the connecting groove, so that the entire jack enters the switching state.

[0009] The spring is always in a compressed state, and the spring applies a force to the movable sleeve, which needs to be borne by the limit column. In order to balance the force of the movable sleeve, the movable sleeve is provided with two limit columns on the surface of the cylindrical part symmetrically distributed relative to the center line of the screw rod. This not only ensures the balance of force on the movable sleeve, but also suppresses the shaking of the movable sleeve.

[0010] In order to increase the connection strength between the fixing seat and the outer tube, the lower end of the fixing seat is embedded in the outer tube, and the side surface of the upper end of the fixing seat is flush with the surface of the outer tube.

[0011] The cylindrical chamber, upper annular chamber, lower annular chamber, and connecting groove inside the fixed seat can all be obtained on a whole piece or multiple pieces of metal materials through existing processing conditions. When facing the assembly process, it is necessary to consider the difficulty of assembly. To this end, the technical solution provides a fixed seat structure that is easy to process and easy to assemble, and the fixed seat includes a main body and an end cover, and the end cover is fixedly installed on the main body by bolts, and the upper annular chamber is located between the main body and the end cover. The main body is obtained by processing a whole piece of metal, and the end cover is a plate-like structure. During assembly, the two can be assembled by fastening with bolts. In addition, the main body is an open structure at the upper annular chamber, so the width of the upper annular chamber in the direction parallel to the center line of the screw rod is easier to control during manufacturing.

[0012] In order to make the positional relationship between the screw and the fixed seat more stable and to avoid the surface of the jack being covered with hollow structures, the limit pins are distributed at equal angles around the center line of the screw, and the pin holes are located inside the outer tube.

[0013] In a preferred embodiment of the non-centrosymmetric structure, the cross-sectional structure of the connecting section is one of a regular polygon, an ellipse, a plum blossom, and a concave polygon. The regular polygon can be a regular triangle, a square, a regular pentagon, a regular hexagon, etc.; the plum blossom can be a four-petal plum blossom, a five-petal plum blossom, or a six-petal plum blossom; the concave polygon can be a five-pointed star, a six-pointed star, a ten-pointed star, etc.

[0014] The upper annular chamber serves the state in which the movable sleeve and the screw rod move synchronously in the circumferential direction around the center line of the screw rod when the connecting section of the screw rod is embedded in the connecting hole. At this time, it is necessary to ensure that the spatial position of the movable sleeve cannot be changed at will, especially to avoid the shaking of the movable sleeve as much as possible, so the size of the upper annular chamber should be slightly larger than the diameter of the limiting column, and the limiting column forms a clearance fit between the fixing seat and the upper annular chamber. The lower annular chamber serves the state in which the movable sleeve and the screw rod move asynchronously in the circumferential direction around the center line of the screw rod when the connecting section is completely separated from the connecting hole and is located in the accommodating hole. At this time, it is also necessary to keep the spatial position of the movable sleeve relatively stable, but considering that the lower annular chamber is in a relatively closed structure and is not conducive to fine processing, the size of the lower annular chamber can be larger than the size of the upper annular chamber. Therefore, the width of the upper annular chamber in the direction parallel to the center line of the screw rod described in the technical solution is smaller than the width of the lower annular chamber in the direction parallel to the center line of the screw rod.

[0015] The premise for the spring to play the reset function for the movable sleeve is that there is sufficient compression. In order to prevent the spring from bending in the compressed state, the movable sleeve is provided with an upper limit hole, the upper limit hole is located below the connecting hole, the diameter of the upper limit hole is larger than the diameter of the connecting hole, the fixed seat is provided with a lower limit hole, the lower limit hole is located below the cylindrical chamber, the diameter of the lower limit hole is smaller than the diameter of the cylindrical chamber, one end of the spring is located in the upper limit hole, and the other end of the spring is located in the lower limit hole. The spring is limited by the upper limit hole and the lower limit hole.

[0016] After the utility model adopts the above technical solution: the top-driven jack does not need to disassemble parts when switching between manual operation and electric operation, and the switching between manual operation and electric operation is achieved through a clutch structure with stable working performance, and unreasonable combination forms can be avoided during the electric operation process, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a front view of a first embodiment of a top-driven jack of the utility model in a synchronous state;

[0019] Figure 2 The internal structure of the first embodiment of the top-driven jack of the utility model in the synchronous state is shown in FIG. Figure Ⅰ ;

[0020] Figure 3 for Figure 2 A partial enlarged view of

[0021] Figure 4 The internal structure of the first embodiment of the top-driven jack of the utility model in the synchronous state is shown in FIG. Figure II ;

[0022] Figure 5 for Figure 4 A partial enlarged view of

[0023] Figure 6 The internal structure of the first embodiment of the top-driven jack of the utility model in the asynchronous state is shown in FIG. Figure Ⅰ ;

[0024] Figure 7 The internal structure of the first embodiment of the top-driven jack of the utility model in the asynchronous state is shown in FIG. Figure II ;

[0025] Figure 8 It is a front view of a screw rod of a first embodiment of a top-driven jack of the utility model;

[0026] Fig. 9 for Figure 8 Left view of

[0027] Fig.10 A three-dimensional diagram of a screw rod of a first embodiment of a top-driven jack of the utility model;

[0028] Fig.11 It is a front view of a movable sleeve of a first embodiment of a top-driven jack of the utility model;

[0029] Fig.12 for Fig.11 Bottom view of

[0030] Fig.13 A three-dimensional diagram of a movable sleeve of a first embodiment of a top-driven jack of the utility model;

[0031] Fig.14 The internal structure of the movable sleeve of the first embodiment of the top-driven jack of the utility model is schematically shown. Figure Ⅰ ;

[0032] Fig.15 The internal structure of the movable sleeve of the first embodiment of the top-driven jack of the utility model is schematically shown. Figure II ;

[0033] Fig.16 A three-dimensional diagram of the main body of a fixing seat of a first embodiment of a top-driven jack of the utility model;

[0034] Fig.17 The internal structure of the fixing seat of the first embodiment of the top-driven jack of the utility model is shown in FIG. Figure Ⅰ ;

[0035] Fig.18 The internal structure of the fixing seat of the first embodiment of the top-driven jack of the utility model is shown in FIG. Figure II . DETAILED DESCRIPTION

[0036] like Figure 1-18 Shown is the first embodiment of the utility model.

[0037] The top-driven jack comprises an outer tube 1 , an inner tube 2 , a screw rod 3 , a nut 7 , a fixing component 8 , and a handle 9 .

[0038] The nut 7 is fixedly mounted on the inner tube 2, and the nut 7 and the inner tube 2 cannot move independently. The screw rod 3 extends into the inner tube 2, and the screw rod 3 is meshed and connected with the nut 7. The inner tube 2 extends into the outer tube 1, and the screw rod 3 is movably mounted in the outer tube 1 through the fixing component 8.

[0039] The fixing component 8 includes a fixing seat 10 , a movable sleeve 20 , a spring 25 , a bearing 26 , and a limiting pin 27 .

[0040] The fixing seat 10 is composed of a body 11 and an end cover 12 .

[0041] The exterior of the body 11 is a boss structure with one end wide and the other end narrow. The narrower end of the body 11 is embedded in the outer tube 1, and the wider end of the body 11 is located outside the outer tube 1. Since the jack is in a vertical state when in use, the narrower end of the body 11 is located below the wider end of the body 11, that is, the lower end of the body 11 is embedded in the outer tube 1. When the body 11 and the outer tube 1 are combined, they are fixedly connected by welding, and the surface is polished until the side surface of the wider end, i.e., the upper end of the body 11, is flush with the surface of the outer tube 1.

[0042] The interior of the body 11 is hollow, and specifically includes a pin hole 13 , an assembly hole 14 , a cylindrical chamber 15 , an upper annular groove, a lower annular chamber 17 , a connecting groove 18 , and a lower limit hole 19 .

[0043] The end cover 12 is an annular structure, which is fixedly installed on the body 11 by bolts. After installation, it directly covers the upper annular groove, so that the upper annular groove is surrounded by the body 11 and the end cover 12 to increase the degree of closure, thereby forming an upper annular chamber 16. The upper annular chamber 16 is located between the body 11 and the end cover 12. In other words, the fixing seat 10 is provided with a pin hole 13, an assembly hole 14, a cylindrical chamber 15, an upper annular chamber 16, a lower annular chamber 17, and a connecting groove 18.

[0044] On the center line of the fixed seat 10, the cylindrical chamber 15, the lower limit hole 19, and the assembly hole 14 are arranged one by one, and the center line of the fixed seat 10, the center line of the cylindrical chamber 15, the center line of the assembly hole 14, and the center line of the lower limit hole 19 coincide. The lower limit hole 19 is located between the cylindrical chamber 15 and the assembly hole 14, and the cylindrical chamber 15 is connected to the lower limit hole 19, and the lower limit hole 19 is connected to the assembly hole 14. The diameter of the assembly hole 14 corresponds to the diameter of the screw rod 3, and there is a clearance fit between the assembly hole 14 and the screw rod 3. The diameter of the lower limit hole 19 is larger than the diameter of the assembly hole 14, and it is located above the assembly hole 14 and below the cylindrical chamber 15. The fixed seat 10 forms a step surface between the lower limit hole 19 and the assembly hole 14. The diameter of the assembly hole 14 is smaller than the diameter of the cylindrical chamber 15, and it is located below the lower limit hole 19. The upper annular chamber 16 and the lower annular chamber 17 are both annular structures, and the inner diameters of the upper annular chamber 16 and the lower annular chamber 17 are equal to the diameter of the cylindrical chamber 15. The upper annular chamber 16 is located at the upper end of the cylindrical chamber 15 and is communicated with the cylindrical chamber 15. The lower annular chamber 17 is located at the lower end of the cylindrical chamber 15 and is communicated with the cylindrical chamber 15. The connecting groove 18 is located on the side of the cylindrical chamber 15 and is straight. Two connecting grooves 18 symmetrically distributed relative to the center line of the cylindrical chamber 15 are provided inside the fixing seat 10. One end of the connecting groove 18 is communicated with the upper annular chamber 16, and the other end of the connecting groove 18 is communicated with the lower annular chamber 17. The side of the connecting groove 18 is communicated with the cylindrical chamber 15. The width of the upper annular chamber 16 in a direction parallel to the center line of the fixing seat 10 is smaller than the width of the lower annular chamber 17 in a direction parallel to the center line of the fixing seat 10 .

[0045] The pin hole 13 is distributed at the lower end of the fixing seat 10, i.e., the narrower end of the body 11. The pin hole 13 is connected to the assembly hole 14, and the pin hole 13 is perpendicular to the assembly hole 14. The pin holes 13 are distributed at equal angles around the center line of the assembly hole 14. The screw rod 3 passes through the assembly hole 14, and a limiting groove 4 is provided on the screw rod 3. The limiting groove 4 is annular around the center line of the screw rod 3. One end of the limiting pin 27 is inserted into the pin hole 13, and the other end of the limiting pin 27 is embedded in the limiting groove 4. In this way, the limiting pin 27 is distributed at equal angles around the center line of the screw rod 3. After installation, the pin hole 13 is located inside the outer tube 1, and the outer tube 1 blocks the pin hole 13, thereby achieving a visual effect of hiding the pin hole 13. The screw rod 3 is movably installed on the fixing seat 10 through the limiting pin 27, and the screw rod 3 can rotate relative to the fixing seat 10. The center line of the screw rod 3 coincides with the center line of the fixing seat 10.

[0046] A flange 5 is provided on the screw rod 3 , and a bearing 26 is mounted on the screw rod 3 and located between the flange 5 and the fixing seat 10 ; the flange 5 is located above the nut 7 .

[0047] One end of the screw rod 3 is provided with a connecting section 6, and the cross section of the connecting section 6 is a non-centrosymmetric structure, such as a regular hexagon. The connecting section 6 of the screw rod 3 passes through the cylindrical chamber 15 of the fixing seat 10 and protrudes outside the fixing seat 10, and the center line of the screw rod 3 coincides with the center line of the cylindrical chamber 15.

[0048] The movable sleeve 20 is also hollow inside, and includes an upper limit hole 24, a connecting hole 22 and a receiving hole 23. The upper limit hole 24, the connecting hole 22 and the receiving hole 23 are connected, and the center line of the upper limit hole 24 and the center line of the connecting hole 22 coincide with the center line of the receiving hole 23. The receiving hole 23 is located above the connecting hole 22, and the upper limit hole 24 is located below the connecting hole 22. The upper limit hole 24 is a circular structure in cross section, and the diameter of the upper limit hole 24 is greater than the maximum width of the connecting hole 22, so that the movable sleeve 20 forms a step surface between the upper limit hole 24 and the connecting hole 22. The cross section of the connecting hole 22 is a non-centrally symmetrical structure, and the cross section structure of the connecting hole 22 corresponds to the cross section structure of the connecting section 6, so the cross section of the connecting hole 22 is also a regular hexagon. The receiving hole 23 is a circular structure in cross section, and the minimum width of the receiving hole 23, that is, the diameter of the receiving hole 23, is greater than the maximum width of the connecting hole 22. The movable sleeve 20 has a cylindrical portion on its exterior, and two limiting columns 21 are symmetrically distributed relative to the center line of the movable sleeve 20 on the surface of the cylindrical portion. The handle 9 is mounted on the movable sleeve 20. The cylindrical portion of the movable sleeve 20 extends into the cylindrical chamber 15, and the movable sleeve 20 is movably connected to the fixed seat 10, and the movable sleeve 20 can rotate in the fixed seat 10.

[0049] After the movable sleeve 20 is installed, the connecting section 6 of the screw rod 3 extends into the movable sleeve 20, the screw rod 3 is movably connected with the movable sleeve 20, and the two limit posts 21 are symmetrically distributed relative to the center line of the screw rod 3; the movable range of the limit posts 21 is located in the upper annular chamber 16, the lower annular chamber 17, and the connecting groove 18, and the limit posts 21 are embedded in the upper annular chamber 16 or the lower annular chamber 17 or the connecting groove 18 at any time. The spring 25 is installed on the screw rod 3 and is located between the movable sleeve 20 and the fixed seat 10, one end of the spring 25 is located in the upper limit hole 24, and the other end of the spring 25 is located in the lower limit hole 19. The spring 25 is always in a compressed state. The direction of the thrust force exerted by the spring 25 on the movable sleeve 20 by pushing the limiting column 21 is parallel to the connecting groove 18. It has a tendency to push the movable sleeve 20 out of the fixed seat 10. However, due to the restrictions of the upper annular chamber 16 and the lower annular chamber 17, the cylindrical part of the movable sleeve 20 can only be inside the fixed seat 10, so the range of motion of the cylindrical part of the movable sleeve 20 intersects with the cylindrical chamber 15. In the initial state, there can only be a state in which the movable sleeve 20 is embedded in the connecting hole 22 through the connecting section 6 and moves synchronously with the screw rod 3 in the circumferential direction around the center line of the screw rod 3, or a state in which the movable sleeve 20 is completely separated from the connecting hole 22 through the connecting section 6 and is located in the receiving hole 23 and moves asynchronously with the screw rod 3 in the circumferential direction around the center line of the screw rod 3.

[0050] When the movable sleeve 20 and the screw rod 3 are in a synchronous motion state, the connecting section 6 is completely embedded in the connecting hole 22, the connecting section 6 does not extend into the accommodating hole 23, the connecting section 6 of the screw rod 3 and the movable sleeve 20 are in clearance fit, and the cross-sections of the two are the same, so when the movable sleeve 20 is driven to rotate by holding the handle 9, the screw rod 3 must be driven to move. The limit column 21 is located in the upper annular chamber 16, and the spring 25 always provides upward support for the movable sleeve 20, so that the limit column 21 is always in the upper annular chamber 16 during the rotation of the movable sleeve 20. At this time, manual operation can only be performed through the handle 9.

[0051] When the movable sleeve 20 and the screw rod 3 are in an asynchronous motion state, the connecting section 6 is completely separated from the connecting hole 22 and the connecting section 6 is completely inserted into the receiving hole 23, and the connection between the connecting section 6 of the screw rod 3 and the movable sleeve 20 is disconnected. At this time, even if the movable sleeve 20 is driven to move, the screw rod 3 cannot be driven to rotate through the movable sleeve 20, and the movable sleeve 20 and the screw rod 3 move independently of each other. The connecting section 6 is in the receiving hole 23, and a gap for accommodating a sleeve of an electric tool is formed between the connecting section 6 and the movable sleeve 20. At this time, the electric operation can only be performed by installing a sleeve on the connecting section 6 and holding the electric tool.

[0052] The switching process between the synchronous motion state and the asynchronous motion state is the switching process between manual operation and electric operation. If the current state is the synchronous motion state, the movable sleeve 20 is rotated and pressed downwardly, and when the limit post 21 is aligned with the connecting groove 18, the limit post 21 will pass through the connecting groove 18 until the movable sleeve 20 further extends into the interior of the fixed seat 10 and the limit post 21 is located in the lower annular chamber 17, and then the movable sleeve 20 is rotated and released, so that the spring 25 presses against the movable sleeve 20 and the limit post 21 is blocked by the body 11 of the fixed seat 10, and finally the movable sleeve 20 is in a stationary state.

[0053] If the current state is the asynchronous motion state, the movable sleeve 20 is rotated. When the limit post 21 is aligned with the connection groove 18, the spring 25 pushes the movable sleeve 20 to move upward until the limit post 21 is located in the upper annular chamber 16. At this time, the spring 25 supports the movable sleeve 20 to maintain the movable sleeve 20 in the state of the upper annular chamber 16. When the connection hole 22 is connected to the connection section 6 of the screw rod 3, the limit post 21 is located in the connection groove 18. Since the width of the connection groove 18 is greater than the width of the limit post 21, the movable sleeve 20 can be rotated relative to the fixed seat 10 at this time. A certain angle, this rotation range is used for the connection hole 22 to match the connection section 6; when the angle of the connection section 6 cannot make its cross section just parallel to the cross section of the connection hole 22, the movable sleeve 20 can be appropriately rotated so that the angle posture of the connection hole 22 completely corresponds to the angle posture of the connection section 6, so that the connection hole 22 is easy to adapt to the connection section 6.

[0054] The second embodiment of the utility model is different from the first embodiment in that only one limiting column is provided outside the movable sleeve.

[0055] The third embodiment of the present utility model is different from the second embodiment in that only one connecting groove is provided inside the fixing base.

[0056] In the above embodiments, a corresponding number of embodiments can be obtained by selecting other non-centrosymmetrical structures, such as an equilateral triangle, a square, a regular pentagon, a four-petal plum blossom, a five-petal plum blossom, a six-petal plum blossom, a five-pointed star, a six-pointed star, a seven-pointed star, an octagonal star, an enagonal star, and a ten-pointed star.

Claims

1. A top-driven jack, comprising an outer tube (1), an inner tube (2), a screw rod (3), a nut (7), a fixing component (8), and a handle (9), wherein the inner tube (2) extends into the outer tube (1), the nut (7) is fixedly mounted on the inner tube (2), the screw rod (3) is movably mounted in the outer tube (1) through the fixing component (8) and the screw rod (3) extends into the inner tube (2), the screw rod (3) is meshedly connected with the nut (7), and is characterized in that: The fixing component (8) comprises a fixing seat (10), a movable sleeve (20), a spring (25), a bearing (26), and a limit pin (27). The fixing seat (10) is fixedly connected to the outer tube (1). The fixing seat (10) is provided with a pin hole (13), an assembly hole (14), a cylindrical chamber (15), an upper annular chamber (16), a lower annular chamber (17), and a connecting groove (18). The cylindrical chamber (15) is connected to the assembly hole (14) and the center line of the cylindrical chamber (15) coincides with the center line of the assembly hole (14). The cylindrical chamber (15) is located above the assembly hole (14). The pin hole (13) is perpendicular to the assembly hole (14). The diameter of the cylindrical chamber (15) is larger than the diameter of the assembly hole (14). 4), the inner diameter of the upper annular chamber (16) and the inner diameter of the lower annular chamber (17) are both equal to the diameter of the cylindrical chamber (15), the upper annular chamber (16) is located at the upper end of the cylindrical chamber (15) and the upper annular chamber (16) is connected to the cylindrical chamber (15), the lower annular chamber (17) is located at the lower end of the cylindrical chamber (15) and the lower annular chamber (17) is connected to the cylindrical chamber (15), the connecting groove (18) is straight, one end of the connecting groove (18) is connected to the upper annular chamber (16), and the other end of the connecting groove (18) is connected to the lower annular chamber (17), the side of the connecting groove (18) is connected to the cylindrical chamber (15), and the screw rod (3) passes through the assembly hole (14 ), one end of the limit pin (27) is inserted into the pin hole (13), the screw rod (3) is provided with a limit groove (4), the limit groove (4) is annular around the center line of the screw rod (3), the other end of the limit pin (27) is embedded in the limit groove (4), the screw rod (3) is provided with a flange (5), the bearing (26) is installed on the screw rod (3) and is located between the flange (5) and the fixed seat (10), the flange (5) is located above the nut (7), the movable sleeve (20) is provided with a cylindrical portion, the movable sleeve (20) is provided with a limit column (21) on the surface of the cylindrical portion, the handle (9) is installed on the movable sleeve (20), and the movable sleeve (20) is provided with a connecting hole (22) and a receiving hole (21) inside. 3), the connecting hole (22) and the receiving hole (23) are connected and the center line of the connecting hole (22) coincides with the center line of the receiving hole (23), the receiving hole (23) is located above the connecting hole (22), the minimum width of the receiving hole (23) is greater than the maximum width of the connecting hole (22), the cross section of the connecting hole (22) is a non-centrally symmetrical structure, a connecting section (6) is provided at one end of the screw rod (3), the cross section of the connecting section (6) is a non-centrally symmetrical structure and the cross section structure of the connecting section (6) corresponds to the cross section structure of the connecting hole (22), the connecting section (6) of the screw rod (3) extends into the interior of the movable sleeve (20), and the end of the screw rod (3) provided with the connecting section (6) passes through the cylindrical chamber (15),The center line of the screw rod (3) coincides with the center line of the cylindrical chamber (15); the connecting section (6) protrudes from the outside of the fixed seat (10); the cylindrical portion of the movable sleeve (20) extends into the cylindrical chamber (15); the movable sleeve (20) is movably connected to the fixed seat (10); the screw rod (3) is movably connected to the movable sleeve (20); the spring (25) is mounted on the screw rod (3) and is located between the movable sleeve (20) and the fixed seat (10); the movable range of the cylindrical portion of the movable sleeve (20) coincides with the cylindrical chamber (15); The cylindrical chamber (15) intersects, the movable range of the limiting column (21) is located in the upper annular chamber (16), the lower annular chamber (17), and the connecting groove (18), the movable sleeve (20) is embedded in the connecting hole (22) through the connecting section (6) and moves synchronously with the screw rod (3) in the circumferential direction around the center line of the screw rod (3), and the movable sleeve (20) is completely separated from the connecting hole (22) through the connecting section (6) and is located in the accommodating hole (23) and moves asynchronously with the screw rod (3) in the circumferential direction around the center line of the screw rod (3).

2. The top-driven jack according to claim 1, characterized in that: Two connecting grooves (18) are arranged inside the fixing seat (10) and are symmetrically distributed relative to the center line of the cylindrical chamber (15).

3. The top-driven jack according to claim 2, characterized in that: The movable sleeve (20) is provided with two limiting posts (21) on the surface of the cylindrical portion and are symmetrically distributed relative to the center line of the screw rod (3).

4. The top-driven jack according to claim 1, characterized in that: The lower end of the fixing seat (10) is embedded in the outer tube (1), and the side surface of the upper end of the fixing seat (10) is flush with the surface of the outer tube (1).

5. The top-driven jack according to claim 1 or 4, characterized in that: The fixing seat (10) comprises a body (11) and an end cover (12); the end cover (12) is fixedly mounted on the body (11) by means of bolts; and the upper annular chamber (16) is located between the body (11) and the end cover (12).

6. The top-driven jack according to claim 4, characterized in that: The limit pins (27) are distributed at equal angles around the center line of the screw rod (3), and the pin holes (13) are located inside the outer tube (1).

7. The top-driven jack according to claim 1, characterized in that: The cross-sectional structure of the connecting section (6) is one of a regular polygon, an ellipse, a quincunx shape, and a concave polygon.

8. The top-driven jack according to claim 1, characterized in that: The width of the upper annular chamber (16) in a direction parallel to the center line of the screw rod (3) is smaller than the width of the lower annular chamber (17) in a direction parallel to the center line of the screw rod (3).

9. The top-driven jack according to claim 1, characterized in that: The movable sleeve (20) is provided with an upper limit hole (24), the upper limit hole (24) is located below the connecting hole (22), the diameter of the upper limit hole (24) is larger than the diameter of the connecting hole (22), the fixed seat (10) is provided with a lower limit hole (19), the lower limit hole (19) is located below the cylindrical chamber (15), the diameter of the lower limit hole (19) is smaller than the diameter of the cylindrical chamber (15), one end of the spring (25) is located in the upper limit hole (24), and the other end of the spring (25) is located in the lower limit hole (19).

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