Jack

Abstract

The utility model discloses a jack, which comprises a lower supporting seat, one end of each lower supporting arm is hinged to the lower supporting base, the other end of each lower supporting arm is hinged to a first connecting base and a second connecting base, and a split nut assembly is fixed to the second connecting base; one ends of the upper supporting arms are respectively hinged with the first connecting seat and the second connecting seat; the upper supporting seat is hinged with the other ends of the pair of upper supporting arms; one end of the driving lead screw is rotationally connected to the first connecting base, the other end of the driving lead screw penetrates through the second connecting base to be matched with the split nut assembly, when the driving lead screw is rotated in the first direction, the split nut assembly is separated from the driving lead screw, and when the driving lead screw is rotated in the second direction, the split nut assembly is in threaded connection with the driving lead screw. According to the jack, quick jacking or descending operation can be achieved by adjusting whether the split nut assembly is in threaded connection with the driving lead screw or not, and the jack has the advantages of being time-saving, labor-saving, quick in jacking or descending, high in efficiency and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting tools, and more specifically to a jack. Background Art

[0002] At present, the existing jacking jack is a common automobile maintenance tool, and its structure is as follows: CN103693580B-A car jack and its lifting method, CN202529775U-A car jack, CN203513169U-Portable safety car jack. During the jacking operation, it is necessary to manually rotate the screw rod to realize the jacking or lowering of the four support arms. The jacking or lowering is not only slow, the operation efficiency is not only low, but also time-consuming and labor-intensive, and the operation is inconvenient.

[0003] Therefore, how to provide a jack that can quickly perform lifting or lowering operations is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] In view of this, the utility model provides a jack which can quickly realize lifting or lowering operations.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A jack, comprising:

[0007] Lower support seat;

[0008] A pair of lower support arms, one end of each of the pair of lower support arms is hinged to the lower support seat, and the other end is respectively hinged to a first connection seat and a second connection seat, and a split nut assembly is fixed to the second connection seat;

[0009] A pair of upper support arms, one end of the pair of upper support arms being hinged to the first connecting seat and the second connecting seat respectively;

[0010] An upper support seat, each of which is hinged to the other end of a pair of upper support arms;

[0011] A driving screw rod, one end of which is an operating end, which passes through and is rotatably connected to the first connecting seat, and the other end passes through the second connecting seat and cooperates with the opening and closing nut assembly, so that when the operating end is rotated in a first direction, the opening and closing nut assembly is disengaged from the driving screw rod, and when the operating end is rotated in a second direction, the opening and closing nut assembly is in contact with the driving screw rod and is threadedly connected.

[0012] It can be seen from the above technical scheme that compared with the prior art, the utility model discloses a jack. Initially, the opening and closing nut assembly and the driving screw are disengaged and not threadedly matched, so the upper support seat can be directly lifted upward to a certain height. At this time, the upper support arm and the lower support arm are opened in a diamond shape, and then the operating end of the driving screw is rotated in the second direction to make the opening and closing nut assembly contact with the driving screw and be threadedly connected, and then the driving screw is continued to be rotated in the second direction. At this time, the opening and closing nut assembly drives the second connecting seat to move closer to the first connecting seat, so that the upper support seat continues to lift upward and finally lifts the weight. Afterwards, when it is necessary to lower the jack, the operating end of the driving screw is rotated in the first direction to disengage the opening and closing nut assembly from the driving screw. At this time, the opening and closing nut assembly is not threadedly connected with the driving screw. At this time, under the gravity of the heavy object, the upper support arm and the lower support arm can quickly move closer to each other, so as to realize the rapid return of the front jack. Therefore, the jack can achieve rapid lifting or lowering operations by adjusting whether the opening and closing nut assembly is connected to the driving screw threaded transmission, effectively avoiding the problem that the traditional jack requires manual continuous rotation of the screw to achieve the lifting or lowering of the four support arms, which causes slow lifting or lowering, time-consuming and labor-intensive, and inconvenient operation.

[0013] Furthermore, a long strip guide groove is provided on the rod wall of the driving screw rod along its length direction, and the split nut assembly comprises:

[0014] A fixed shell, the fixed shell is fixedly connected to the second connecting seat, a through hole is formed at one end of the fixed shell, and the other end of the fixed shell is open;

[0015] The split nut comprises a first half nut and a second half nut, both of which are arranged inside the fixed housing and matched with each other, a first half thread groove on the first half nut and a second half thread groove on the second half nut match with each other to form a nut hole, and the other end of the driving screw rod passes through the through hole and is inserted into the nut hole;

[0016] A driving seat, wherein the driving seat is rotatably connected to the open end of the fixed housing, one side end of the driving seat is in contact with one side end of the first half nut and the second half nut away from the through hole, thereby realizing the separation and combination operation of the first half nut and the second half nut, and a first through hole is provided on the driving seat, and the other end of the driving screw rod is inserted into the first through hole;

[0017] A driving telescopic member is installed on the side wall of the driving seat, and a telescopic end of the driving telescopic member extends into the first through hole and is inserted into the long strip guide groove.

[0018] When the operating end of the driving screw rod is rotated in the second direction, the long guide groove drives the telescopic end of the driving telescopic member to rotate together, thereby causing the driving seat to rotate in the first direction and to push the first half nut and the second half nut away from each other and disengage from the driving screw rod. At this time, the nut hole is divided into the first half thread groove and the second half thread groove, and the nut hole is not threadedly connected with the driving screw rod, so that the jack can be quickly raised or lowered. When the operating end of the driving screw rod is rotated in the second direction, the long guide groove drives the telescopic end of the driving telescopic member to rotate together, thereby causing the driving seat to rotate in the second direction and to push the first half nut and the second half nut close to each other, so that the first half nut and the second half nut are aligned. At this time, the first half thread groove and the second half thread groove are aligned to form a nut hole, and the driving screw rod is threadedly connected to the nut hole. After that, the driving screw rod continues to be rotated in the second direction. At this time, the opening and closing nut assembly drives the second connecting seat to move closer to the first connecting seat, so that the upper support seat continues to lift upward, and finally lifts the heavy object. Therefore, the jack adopts two separable and combineable half nuts to realize the separation and combination with the driving screw rod, thereby realizing the rapid lifting and lowering operation of the jack.

[0019] Furthermore, guide grooves are provided on the bottom and top surfaces of the first half nut and the second half nut, and guide pillars are placed in the guide grooves.

[0020] The beneficial effect of adopting the above technical solution is that the first half nut and the second half nut can be separated or combined along the length direction of the guide column, ensuring that the first half nut and the second half nut can be accurately matched.

[0021] Furthermore, an accommodating groove is provided on the outer peripheral wall of the first half nut and the second half nut on one side of the guide groove, and a reset spring is sleeved in the accommodating groove.

[0022] The beneficial effect of adopting the above technical solution is that the return spring can assist the first half nut and the second half nut to mate, and can improve the stability after the mate.

[0023] Furthermore, a first lever and a second lever are respectively fixed to one side end of the first half nut and the second half nut away from the through hole, a paddle is fixed to one side end of the drive seat and is in contact with the first lever and the second lever, a second through hole coaxially arranged with the first through hole is provided on the paddle, and the other end of the driving screw rod passes through the second through hole and extends into the first through hole.

[0024] The beneficial effect of adopting the above technical solution is that when the paddle is rotated in the first direction or the second direction, the first half nut and the second half nut can be separated and combined by moving the first paddle and the second paddle.

[0025] Furthermore, a first limiting protrusion and a second limiting protrusion are integrally connected to the outer peripheral wall of the plectrum at intervals, a first limiting lug is integrally connected to one side of the first limiting protrusion, and a second limiting lug is integrally connected to one side of the second limiting protrusion;

[0026] The wall surface of the paddle between the first limiting protrusion and the second limiting protrusion is a first shifting track surface, and the wall surface of the paddle between the second limiting protrusion and the first limiting protrusion is a second shifting track surface;

[0027] The first toggle track surface includes a first closed toggle arc surface and a first open toggle arc surface, the distance from the first closed toggle arc surface to the center of the second through hole gradually increases from the proximal end to the distal end, the proximal end of the first open toggle arc surface is connected with the distal end of the first closed toggle arc surface, and the distal end of the first open toggle arc surface is connected with the other side of the second limiting protrusion;

[0028] A first limiting notch is formed between the proximal end of the first closed toggle arc surface and the first limiting lug, a first limiting groove is formed between the first open toggle arc surface and the second limiting lug, and the first toggle rod is in sliding contact with the first closed toggle arc surface and the first open toggle arc surface, and is placed in the first limiting notch or the first limiting groove;

[0029] The second toggle track surface includes a second closed toggle arc surface and a second open toggle arc surface, the distance from the second closed toggle arc surface to the center of the second through hole gradually increases from the proximal end to the distal end, the proximal end of the second open toggle arc surface is connected with the distal end of the second closed toggle arc surface, and the distal end of the second open toggle arc surface is connected with the other side of the first limiting protrusion;

[0030] A second limiting notch is formed between the proximal end of the second closed toggle arc surface and the second limiting lug, and a second limiting groove is formed between the distal end of the second open toggle arc surface and the first limiting protrusion. The second toggle rod is in sliding contact with the second closed toggle arc surface and the second open toggle arc surface, and is placed in the second limiting notch or the second limiting groove.

[0031] The beneficial effect of adopting the above technical solution is that when the paddle is rotated in the first direction, the first open toggle arc surface gradually contacts the first lever, and the second open toggle arc surface gradually contacts the second lever. Because the first open toggle arc surface is more convex than the first closed toggle arc surface, and the second open toggle arc surface is more convex than the second closed toggle arc surface, the first open toggle arc surface and the second open toggle arc surface will respectively push the first lever and the second lever to move outward, that is, in opposite directions. When the first lever is located in the first limiting groove and when the second lever is located in the second limiting groove, the paddle can no longer continue to rotate, indicating that the paddle has been rotated into place. At this time, driven by the first lever and the second lever, the first half nut and the second half nut are opened outward and separated into place, and the nut hole is no longer threadedly connected to the driving screw, and the complex The positioning spring is forced to expand outward, and the jack can be quickly raised or lowered at this time; when the paddle is rotated in the second direction, the first closed toggle arc surface gradually contacts the first toggle rod, and the second closed toggle arc surface gradually contacts the second toggle rod. Because the first closed toggle arc surface is closer to the second through hole side than the first open toggle arc surface, and the second closed toggle arc surface is closer to the second through hole side than the second open toggle arc surface, therefore, under the restoring force of the reset spring, the first half nut and the second half nut gradually approach each other. When the first toggle rod is located at the first limit slot and the second toggle rod is located at the second limit slot, it means that the paddle has been rotated into place. At this time, the first half nut and the second half nut are matched, and the nut hole is threadedly connected to the drive screw. At this time, continue to rotate the drive screw in the second direction to realize the jacking operation.

[0032] Furthermore, a first through hole communicating with the first through hole is provided on the outer wall of the driving seat, and the driving telescopic member includes:

[0033] A mounting block, wherein the bottom end of the mounting block is fixedly connected to the outer wall of the driving seat, the bottom end of the mounting block is provided with a mounting groove, and the top end of the mounting block is provided with a second through hole communicating with the mounting groove;

[0034] A telescopic pin, the bottom of which is inserted into the second insertion hole and the mounting groove, a clamping block is fixed to the bottom end of the telescopic pin, the clamping block is inserted into the first insertion hole, and the clamping block has a convex strip that is plugged into the long strip guide groove;

[0035] A spring is placed in the installation slot, the spring is sleeved on the telescopic pin, one end of the spring abuts against the top of the block, and the other end abuts against the bottom of the installation slot.

[0036] The beneficial effects of the above technical solution are as follows: when the driving screw is rotated in the first direction, the convex strip rotates together under the action of the long strip guide groove, thereby realizing the rotation of the driving seat, and finally realizing the rotation of the paddle on the driving seat in the first direction to realize the separation of the first half nut and the second half nut; when the driving screw is rotated in the second direction, the convex strip rotates together under the action of the long strip guide groove, thereby realizing the rotation of the driving seat, and finally realizing the rotation of the paddle on the driving seat in the second direction to realize the combination of the first half nut and the second half nut, and then the driving screw is continued to be rotated in the second direction, and because the first paddle is stuck in the first limiting groove and the second paddle is stuck in the second limiting groove, the paddle cannot continue to rotate in the second direction, at this time, the convex strip is pushed upward away from the long strip guide groove by the rotating driving screw, the spring is compressed, and the driving screw directly drives the opening and closing nut to move toward the first connecting seat, realizing the continued upward lifting operation. Afterwards, the driving screw is rotated in the first direction, and the convex strip is again plugged and matched with the long strip guide groove under the action of the spring.

[0037] Furthermore, a guide groove is provided on the inner wall of the first through hole, and a guide protrusion is integrally formed on the outer wall of the clamping block, and the guide protrusion is slidably connected to the guide groove.

[0038] The beneficial effect of adopting the above technical solution is: ensuring that the convex strip does not deflect when moving up and down, thereby ensuring that the length direction of the convex strip can always match the length direction of the long strip guide groove, and ultimately ensuring that the convex strip can be stably plugged into the long strip guide groove at any time.

[0039] Furthermore, an external hexagonal operating sleeve is rotatably connected to one side wall of the first connecting seat, one end of the driving screw is fixed in the external hexagonal operating sleeve by a pin, and the external hexagonal operating sleeve cooperates with an external internal hexagonal sleeve tool.

[0040] The beneficial effect of adopting the above technical solution is that it is convenient to use an external hexagonal socket tool to rotate the drive screw rod, thereby achieving a labor-saving effect.

[0041] Furthermore, the two ends of a pair of lower support arms respectively have a first meshing tooth surface and a second meshing tooth surface, and the two first meshing tooth surfaces are meshingly connected; the two ends of a pair of upper support arms respectively have a third meshing tooth surface and a fourth meshing tooth surface, and the two third meshing tooth surfaces are meshingly connected, and the fourth meshing tooth surface is meshingly connected with the second meshing tooth surface.

[0042] The beneficial effect of adopting the above technical solution is: when the lower support arm and the upper support arm are opened in a diamond shape, one end of a pair of lower support arms are meshed and connected through the first meshing tooth surface, one end of the upper support arm is meshed with the other end of the lower support arm through the fourth meshing surface and the second meshing tooth surface, and the other end of a pair of upper support arms is meshed through the third meshing tooth surface, which can ensure the stability of the upper support arm and the lower support arm after opening, and avoid shaking that affects the jacking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0044] Figure 1 This is a structural schematic diagram of a jack provided by the utility model from a first perspective.

[0045] Figure 2 The present invention is a structural schematic diagram of a jack provided by the utility model from a second viewing angle.

[0046] Figure 3 This is a schematic diagram of the first perspective of the exploded structure of the lower support arm and the upper support arm of the jack provided by the utility model.

[0047] Figure 4 This is a schematic diagram of the exploded structure of the lower support arm and the upper support arm of the jack provided by the utility model from a second viewing angle.

[0048] Figure 5 This is a schematic diagram of the assembly of the drive screw and split nut assembly.

[0049] Figure 6 A schematic cross-sectional view of the assembly of the drive screw and split nut assembly.

[0050] Figure 7 A schematic diagram of the first perspective of the exploded structure of the split nut assembly.

[0051] Figure 8 A schematic diagram of a second perspective of the exploded structure of the split nut assembly.

[0052] Fig. 9 It is a schematic diagram of the paddle cooperating with the first lever and the second lever.

[0053] Fig.10 It is the assembly diagram of the driving seat and the driving telescopic member.

[0054] Fig.11It is a schematic diagram of the exploded structure of the driving seat and the driving telescopic member from a first perspective.

[0055] Fig.12 It is a schematic diagram of the exploded structure of the driving seat and the driving telescopic member from a second perspective.

[0056] Fig.13 It is a schematic diagram of the main structure of the drive seat and the drive telescopic member.

[0057] Fig.14 for Fig.13 Schematic cross-sectional view of the middle section AA.

[0058] Fig.15 for Fig.13 Schematic cross-sectional view of the middle section BB. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0060] like Figure 1-Figure 15 The utility model embodiment discloses a jack, comprising:

[0061] Lower support seat 1;

[0062] A pair of lower support arms 2, one end of the pair of lower support arms 2 is hinged to the lower support seat 1 through a pin shaft, and the other end is hinged to a first connection seat 3 and a second connection seat 4 through a pin shaft, and a split nut assembly 5 is welded or screwed on the second connection seat 4;

[0063] A pair of upper support arms 6, one end of the pair of upper support arms 6 is respectively hinged to the first connection seat 3 and the second connection seat 4 through a pin shaft;

[0064] The upper support seat 7 is hinged to the other ends of the pair of upper support arms 6 through a pin shaft;

[0065] The driving screw rod 8 has one end as the operating end 81, which passes through and is rotatably connected to the first connecting seat 3, and the other end passes through the second connecting seat 4 and cooperates with the opening and closing nut assembly 5, so that when the operating end 81 is rotated in the first direction, the opening and closing nut assembly 5 is disengaged from the driving screw rod 8, and when the operating end 81 is rotated in the second direction, the opening and closing nut assembly 5 contacts the driving screw rod 8 and is threadedly connected.

[0066] Among them, a long strip guide groove 82 is opened on the rod wall of the driving screw rod 8 along its length direction, and the split nut assembly 5 includes:

[0067] A fixed housing 51, the fixed housing 51 is welded or screwed to the second connection base 4, a through hole 511 is formed at one end of the fixed housing 51, and the other end of the fixed housing 51 is open;

[0068] The split nut 52 includes a first half nut 521 and a second half nut 522, both of which are arranged inside the fixed housing 51 and matched with each other. A first half thread groove 5211 on the first half nut 521 and a second half thread groove 5221 on the second half nut 522 match with each other to form a nut hole 5201. The other end of the driving screw rod 8 passes through the through hole 511 and is inserted into the nut hole 5201.

[0069] The driving seat 53 is rotatably connected to the open end of the fixed housing 51. One side end of the driving seat 53 is in contact with the first half nut 521 and the second half nut 522 away from the through hole 511, thereby realizing the separation and combination operation of the first half nut 521 and the second half nut 522. The driving seat 53 is provided with a first through hole 531, and the other end of the driving screw rod 8 is inserted into the first through hole 531;

[0070] A driving telescopic member 54, which is mounted on the side wall of the driving seat 53, and a telescopic end of the driving telescopic member 54 extends into the first through hole 531 and is inserted into the long strip guide groove 82;

[0071] The first half nut 521 and the second half nut 522 are both provided with guide grooves 5202 at the bottom and top ends thereof, and guide posts 9 are placed in the guide grooves 5202;

[0072] An accommodating groove 5203 is provided on the outer peripheral wall of the first half nut 521 and the second half nut 522 at one side of the guide groove 5202 , and a return spring (not shown in the figure) is sleeved in the accommodating groove 5203 .

[0073] More specifically, the first and second half nut 521 and 522 are respectively fixed with a first lever 5212 and a second lever 5222 at one end away from the through hole 511, and the drive seat 53 is fixed with a paddle 532 at one end which is in contact with the first and second lever 5212 and 5222, and the paddle 532 is provided with a second through hole 5321 which is coaxially arranged with the first through hole 531, and the other end of the driving screw rod 8 passes through the second through hole 5321 and extends into the first through hole 531.

[0074] In this embodiment, a first limiting protrusion 5322 and a second limiting protrusion 5323 are integrally connected to the outer peripheral wall of the paddle 532, a first limiting lug 53221 is integrally connected to one side of the first limiting protrusion 5322, and a second limiting lug 53231 is integrally connected to one side of the second limiting protrusion 5323;

[0075] The wall surface of the paddle 532 between the first limiting protrusion 5322 and the second limiting protrusion 5323 is a first moving track surface 5324, and the wall surface of the paddle 532 between the second limiting protrusion 5323 and the first limiting protrusion 5322 is a second moving track surface 5325;

[0076] The first toggle track surface 5324 includes a first closed toggle arc surface 53241 and a first open toggle arc surface 53242. The distance from the first closed toggle arc surface 53241 to the center of the second through hole 5321 gradually increases from the proximal end to the distal end. The proximal end of the first open toggle arc surface 53242 is connected to the distal end of the first closed toggle arc surface 53241, and the distal end of the first open toggle arc surface 53242 is connected to the other side of the second limiting protrusion 5323, as shown in FIG. Fig. 9 The first open and movable arc surface is more convex than the first closed and movable arc surface, and the first closed and movable arc surface is closer to the second through hole than the first open and movable arc surface;

[0077] A first limiting notch 532401 is formed between the proximal end of the first closed toggle arc surface 53241 and the first limiting lug 53221, a first limiting groove 532402 is provided between the first open toggle arc surface 53242 and the second limiting protrusion 5323, and the first lever 5212 is in sliding contact with the first closed toggle arc surface 53241 and the first open toggle arc surface 53242, and is placed in the first limiting notch 532401 or the first limiting groove 532402;

[0078] The second toggle track surface 5325 includes a second closed toggle arc surface 53251 and a second open toggle arc surface 53252. The distance from the second closed toggle arc surface 53251 to the center of the second through hole 5321 gradually increases from the proximal end to the distal end. The proximal end of the second open toggle arc surface 53252 is connected to the distal end of the second closed toggle arc surface 53251, and the distal end of the second open toggle arc surface 53252 is connected to the other side of the first limiting protrusion 5322, as shown in FIG. Fig. 9 The second open and movable arc surface is more convex than the second closed and movable arc surface, and the second closed and movable arc surface is closer to the second through hole than the second open and movable arc surface;

[0079] A second limiting slot 532501 is formed between the proximal end of the second closed toggle arc surface 53251 and the second limiting lug 53231, and a second limiting groove 532502 is formed between the distal end of the second open toggle arc surface 53252 and the first limiting protrusion 5322. The second lever 5222 is in sliding contact with the second closed toggle arc surface 53251 and the second open toggle arc surface 53252, and is placed in the second limiting slot 532501 or the second limiting groove 532502.

[0080] A first through hole 533 communicating with the first through hole 531 is formed on the outer wall of the driving seat 53. The driving telescopic member 54 includes:

[0081] A mounting block 541, the bottom end of which is welded or screwed to the outer wall of the driving seat 53, a mounting groove 5411 is formed at the bottom end of the mounting block 541, and a second through hole 5412 communicating with the mounting groove 5411 is formed at the top end of the mounting block 541;

[0082] The telescopic pin 542, the bottom of which is inserted into the second insertion hole 5412 and the mounting groove 5411, the bottom of which is fixed with a clamping block 543, the clamping block 543 is inserted into the first insertion hole 533, and the clamping block 543 has a convex strip 5431 which is plugged into the long strip guide groove 82;

[0083] Spring 544 , spring 544 is placed in the installation groove 5411 , spring 544 is sleeved on the telescopic pin 542 , one end of the spring 544 abuts against the top of the block 543 , and the other end abuts against the bottom of the installation groove 5411 .

[0084] A guide groove 5331 is formed on the inner wall of the first through hole 533 , and a guide protrusion 5432 is integrally formed on the outer wall of the clamping block 543 . The guide protrusion 5432 is slidably connected to the guide groove 5331 .

[0085] An outer hexagonal operating sleeve 10 is rotatably connected to one side wall of the first connecting seat 3. One end of the driving screw 8 is fixed in the outer hexagonal operating sleeve 10 through a pin 11. The outer hexagonal operating sleeve 10 cooperates with an external inner hexagonal sleeve tool.

[0086] In other embodiments, a pair of lower support arms 2 have a first meshing tooth surface 21 and a second meshing tooth surface 22 at both ends, and the two first meshing tooth surfaces 21 are meshingly connected; a pair of upper support arms 6 have a third meshing tooth surface 61 and a fourth meshing tooth surface 62 at both ends, and the two third meshing tooth surfaces 61 are meshingly connected, and the fourth meshing tooth surface 62 is meshingly connected to the second meshing tooth surface 22.

[0087] The process of using the jack is as follows:

[0088] Initially, the first half nut and the second half nut are in an open state, and the reset spring is in an outwardly stretched state. At this time, the threaded hole and the driving screw are disengaged from the threaded fit, so the upper support seat can be directly pulled upward to a certain height. At this time, the upper support arm and the lower support arm quickly open in a diamond shape, and then the driving screw is rotated in the second direction. Because the convex strip and the long strip guide groove on the driving screw are in plug-in fit, the driving screw will drive the driving seat to rotate at the same time through the convex strip. At this time, the paddle on the driving seat also rotates at the same time, see Fig. 9 In the direction of the solid arrow in the figure, the first closed toggle arc surface gradually contacts the first toggle rod, and the second closed toggle arc surface gradually contacts the second toggle rod. Because the first closed toggle arc surface is closer to the second through hole side than the first open toggle arc surface, and the second closed toggle arc surface is closer to the second through hole side than the second open toggle arc surface, therefore, under the restoring force of the reset spring, the first half nut and the second half nut gradually approach each other. When the first toggle rod is located at the first limit slot and the second toggle rod is located at the second limit slot, it means that the paddle has been rotated into place. At this time, the first half nut and the second half nut are aligned, and the nut hole is threadedly connected to the driving screw rod. At this time, the driving screw rod continues to be rotated in the second direction, and because the first toggle rod is stuck in the first limit slot and the second toggle rod is stuck in the second limit slot, the paddle cannot continue to rotate in the second direction. At this time, the driving screw rod whose protrusion is rotated is pushed upward away from the long strip guide slot, the spring is compressed, and the driving screw rod directly drives the opening and closing nut to move in the direction of the first connecting seat, thereby continuing to lift the heavy object upward.

[0089] Afterwards, when the jack needs to be lowered, the driving screw is rotated in the first direction, and the convex strip is again plugged into the long strip guide groove under the action of the spring, and the convex strip rotates together under the toggle of the long strip guide groove. At this time, the paddle on the driving seat also rotates at the same time, see Fig. 9 As shown in the dotted arrow in the figure, when the paddle is rotated in the first direction, the first opened toggle arc surface gradually contacts the first lever, and the second opened toggle arc surface gradually contacts the second lever. Because the first opened toggle arc surface is more convex than the first closed toggle arc surface, and the second opened toggle arc surface is more convex than the second closed toggle arc surface, the first opened toggle arc surface and the second opened toggle arc surface will respectively push the first lever and the second lever to move outward, that is, in opposite directions. When the first lever is located in the first limiting groove and when the second lever is located in the second limiting groove, the paddle can no longer continue to rotate, indicating that the paddle has been rotated into place. At this time, driven by the first lever and the second lever, the first half nut and the second half nut are opened outward and separated into place, the nut hole is no longer threadedly connected to the driving screw, and the return spring is forced to expand outward. At this time, under the gravity of the heavy object, the jack can quickly fall back downward.

[0090] Therefore, the jack can achieve rapid lifting or lowering operations by adjusting whether the opening and closing nut assembly is connected to the driving screw threaded transmission, effectively avoiding the problem that the traditional jack requires manual continuous rotation of the screw to achieve the lifting or lowering of the four support arms, which causes slow lifting or lowering, time-consuming and labor-intensive, and inconvenient operation.

[0091] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0092] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A jack, characterized in that: include: Lower support seat (1); A pair of lower support arms (2), one end of each of the lower support arms (2) being hinged to the lower support seat (1), and the other end of each of the lower support arms (2) being hinged to a first connection seat (3) and a second connection seat (4), respectively, and a split nut assembly (5) being fixed to the second connection seat (4); A pair of upper support arms (6), one end of the pair of upper support arms (6) being hinged to the first connecting seat (3) and the second connecting seat (4) respectively; An upper support seat (7), wherein the upper support seat (7) is hinged to the other end of a pair of upper support arms (6); A driving screw rod (8), one end of which is an operating end (81), which passes through and is rotatably connected to the first connecting seat (3), and the other end of which passes through the second connecting seat (4) and cooperates with the opening and closing nut assembly (5), so that when the operating end (81) is rotated in a first direction, the opening and closing nut assembly (5) is disengaged from the driving screw rod (8), and when the operating end (81) is rotated in a second direction, the opening and closing nut assembly (5) is in contact with the driving screw rod (8) and is threadedly connected.

2. A jack according to claim 1, characterized in that: The driving screw rod (8) has a long strip guide groove (82) formed on its rod wall along its length direction. The split nut assembly (5) comprises: A fixed shell (51), the fixed shell (51) being fixedly connected to the second connecting seat (4), a through hole (511) being provided at one end of the fixed shell (51), and the other end of the fixed shell (51) being open; The split nut (52) comprises a first half nut (521) and a second half nut (522) both arranged inside the fixed housing (51) and arranged in a matched manner, wherein a first half thread groove (5211) on the first half nut (521) and a second half thread groove (5221) on the second half nut (522) are matched to form a nut hole (5201), and the other end of the driving screw rod (8) passes through the through hole (511) and is inserted into the nut hole (5201); A driving seat (53), wherein the driving seat (53) is rotatably connected to the open end of the fixed housing (51), and one side end of the driving seat (53) is in contact with one side end of the first half nut (521) and the second half nut (522) away from the through hole (511), thereby realizing the separation and combination operation of the first half nut (521) and the second half nut (522), and a first through hole (531) is provided on the driving seat (53), and the other end of the driving screw rod (8) is inserted into the first through hole (531); A driving telescopic member (54), wherein the driving telescopic member (54) is mounted on a side wall of the driving seat (53), and a telescopic end of the driving telescopic member (54) extends into the first through hole (531) and is inserted into the long strip guide groove (82); The bottom and top surfaces of the first half nut (521) and the second half nut (522) are both provided with guide grooves (5202), and guide pillars (9) are placed in the guide grooves (5202); An accommodating groove (5203) is provided on the outer peripheral wall of the first half nut (521) and the second half nut (522) on one side of the guide groove (5202), and a return spring is sleeved in the accommodating groove (5203).

3. A jack according to claim 2, characterized in that: A first lever (5212) and a second lever (5222) are fixed to one side end of the first half nut (521) and the second half nut (522) away from the through hole (511), respectively; a paddle (532) that is in contact with the first lever (5212) and the second lever (5222) is fixed to one side end of the drive seat (53); a second through hole (5321) coaxially arranged with the first through hole (531) is provided on the paddle (532); the other end of the drive screw rod (8) passes through the second through hole (5321) and extends into the first through hole (531).

4. A jack according to claim 3, characterized in that: A first limiting protrusion (5322) and a second limiting protrusion (5323) are integrally connected to the outer peripheral wall of the plectrum (532), one side of the first limiting protrusion (5322) is integrally connected to a first limiting lug (53221), and one side of the second limiting protrusion (5323) is integrally connected to a second limiting lug (53231); The wall surface on the paddle (532) located between the first limiting protrusion (5322) and the second limiting protrusion (5323) is a first shifting track surface (5324), and the wall surface on the paddle (532) located between the second limiting protrusion (5323) and the first limiting protrusion (5322) is a second shifting track surface (5325); The first toggle track surface (5324) includes a first closed toggle arc surface (53241) and a first open toggle arc surface (53242), the distance from the first closed toggle arc surface (53241) to the center of the second through hole (5321) gradually increases from the proximal end to the distal end, the proximal end of the first open toggle arc surface (53242) is connected to the distal end of the first closed toggle arc surface (53241), and the distal end of the first open toggle arc surface (53242) is connected to the other side of the second limiting protrusion (5323); A first limiting notch (532401) is formed between the proximal end of the first closed toggle arc surface (53241) and the first limiting lug (53221); a first limiting groove (532402) is provided between the first open toggle arc surface (53242) and the second limiting lug (5323); the first toggle rod (5212) is in sliding contact with the first closed toggle arc surface (53241) and the first open toggle arc surface (53242), and is placed in the first limiting notch (532401) or the first limiting groove (532402); The second toggle track surface (5325) includes a second closed toggle arc surface (53251) and a second open toggle arc surface (53252), the distance from the second closed toggle arc surface (53251) to the center of the second through hole (5321) gradually increases from the proximal end to the distal end, the proximal end of the second open toggle arc surface (53252) is connected to the distal end of the second closed toggle arc surface (53251), and the distal end of the second open toggle arc surface (53252) is connected to the other side of the first limiting protrusion (5322); A second limiting notch (532501) is formed between the proximal end of the second closed toggle arc surface (53251) and the second limiting lug (53231), and a second limiting groove (532502) is formed between the distal end of the second open toggle arc surface (53252) and the first limiting protrusion (5322), and the second toggle rod (5222) is in sliding contact with the second closed toggle arc surface (53251) and the second open toggle arc surface (53252), and is placed in the second limiting notch (532501) or the second limiting groove (532502).

5. A jack according to any one of claims 2 to 4, characterized in that: The outer wall of the driving seat (53) is provided with a first through hole (533) communicating with the first through hole (531), and the driving telescopic member (54) comprises: A mounting block (541), wherein the bottom end of the mounting block (541) is fixedly connected to the outer wall of the driving seat (53), the bottom end of the mounting block (541) is provided with a mounting groove (5411), and the top end of the mounting block (541) is provided with a second through hole (5412) communicating with the mounting groove (5411); A telescopic pin (542), the bottom of the telescopic pin (542) is inserted into the second insertion hole (5412) and the installation groove (5411), a clamping block (543) is fixed to the bottom end of the telescopic pin (542), the clamping block (543) is inserted into the first insertion hole (533), and the clamping block (543) has a convex strip (5431) that is plugged into and matched with the long strip guide groove (82); A spring (544), wherein the spring (544) is placed in the installation groove (5411), the spring (544) is sleeved on the telescopic pin (542), one end of the spring (544) abuts against the top of the block (543), and the other end abuts against the bottom of the installation groove (5411).

6. A jack according to claim 5, characterized in that: A guide groove (5331) is provided on the inner wall of the first penetration hole (533), and a guide protrusion (5432) is integrally formed on the outer wall of the clamping block (543), and the guide protrusion (5432) is slidably connected to the guide groove (5331).

7. A jack according to any one of claims 1 to 4 and 6, characterized in that: An external hexagonal operating sleeve (10) is rotatably connected to a side wall of the first connecting seat (3); one end of the driving screw rod (8) is fixed in the external hexagonal operating sleeve (10) via a pin (11); and the external hexagonal operating sleeve (10) cooperates with an external internal hexagonal sleeve tool.

8. A jack according to any one of claims 1 to 4 and 6, characterized in that: The two ends of a pair of lower support arms (2) respectively have a first meshing tooth surface (21) and a second meshing tooth surface (22), and the two first meshing tooth surfaces (21) are meshingly connected; the two ends of a pair of upper support arms (6) respectively have a third meshing tooth surface (61) and a fourth meshing tooth surface (62), and the two third meshing tooth surfaces (61) are meshingly connected, and the fourth meshing tooth surface (62) is meshingly connected with the second meshing tooth surface (22).

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