CN109743917B - Locking device, limiting mechanism and tractor - Google Patents
Locking device, limiting mechanism and tractor Download PDFInfo
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- CN109743917B CN109743917B CN201711086440.3A CN201711086440A CN109743917B CN 109743917 B CN109743917 B CN 109743917B CN 201711086440 A CN201711086440 A CN 201711086440A CN 109743917 B CN109743917 B CN 109743917B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 27
- 230000000670 limiting effect Effects 0.000 title abstract description 36
- 230000000694 effects Effects 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims 1
- 238000013016 damping Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003971 tillage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention provides a locking device, a limiting mechanism and a tractor, relates to the technical field of tractors, and aims to solve the problems that threads on a feedback rod are easy to wear, so that nuts are loosened and the limiting effect is affected. The locking device includes: the device comprises a fixed seat, a locking piece and a nut, wherein the fixed seat comprises an end part and a rod part which are connected with each other, the rod part comprises a threaded section, the nut is arranged on the threaded section, and an ear plate is arranged on the nut; the locking piece includes locking portion and two stalk portions, and locking portion is the arc, and the both ends of locking portion are connected with the stalk portion respectively, and locking portion and stalk portion form U type structure, and two stalk portions all suit are in the pole portion of fixing base, and are located between the tip and the nut of fixing base, and locking portion is formed with the locking hole that is used for supplying the feedback pole to pass, and the opening of locking hole is towards the pole portion of fixing base. The locking device is applied to the limiting mechanism, can be locked on the feedback rod without arranging threads on the feedback rod, is convenient to adjust and does not need tool assistance.
Description
Technical Field
The invention relates to the technical field of tractors, in particular to a locking device, a limiting mechanism and a tractor.
Background
Hydraulic suspension devices are an important component of tractors that utilize hydraulic pressure as the power to lift and control suspended agricultural implements. The driver controls the hydraulic power through the control mechanism to realize the lifting and descending of the suspension mechanism and the farm machinery. The lifting height limiting device of the tractor is used for limiting the highest position of the hanging mechanism and the hanging machine tool. When the machine tool is lifted to the height required by a user, the lifting arm pulls the control handle back to the middle position through the limiting mechanism.
When the tractor unit performs rotary tillage and other operations, the power output shaft of the tractor is required to be connected with the power input shaft of the farm implement while the suspension device is connected. The two power shafts are connected through a coupler. If the machine is lifted too high, the included angle between the two shafts is too large, the power output shaft can be broken. In order to prevent this, the lifting height of the agricultural implement must be limited. And because of the diversity of the hitching machine and the different requirements of various working conditions (for example, when the hitching machine is transported, the power output shaft does not rotate, the lifting height is increased so as to improve the trafficability of the unit), the highest lifting position must be convenient to adjust.
In the prior art, a screw thread is arranged on a feedback rod of a limiting mechanism, two nuts are arranged at the screw thread, and the positions of the nuts on the feedback rod can be changed by screwing the nuts after the nuts are loosened by using two wrenches simultaneously, so that the limiting height is adjusted. After lifting to the highest position, the lifting arm pulls the handle back to the middle position through the limiting nut and the feedback rod under the action of hydraulic power of the lifting oil cylinder, at the moment, the nut is subjected to larger impact, friction force between the nut and threads on the feedback rod is larger, the threads on the feedback rod are worn, and accordingly the nut is loose, and limiting effect is affected.
Disclosure of Invention
The invention aims to provide a locking device to solve the technical problems that in the prior art, threads on a feedback rod are easy to wear, so that nuts are loosened, and the limiting effect is affected.
The present invention provides a locking device comprising: a fixing seat, a locking piece and a nut,
the fixing seat comprises an end part and a rod part which are connected with each other, the rod part comprises a threaded section, the nut is arranged on the threaded section, and the nut is provided with an ear plate;
the locking piece comprises a locking part and two handle parts, wherein the locking part is arc-shaped, two ends of the locking part are respectively connected with the handle parts, the locking part and the handle parts form a U-shaped structure, the two handle parts are sleeved on the rod parts of the fixing base and located between the end parts of the fixing base and the nuts, locking holes for a feedback rod to pass through are formed in the locking part, and the openings of the locking holes face the rod parts of the fixing base.
Further, the nut is a disc nut.
Further, an extension handle is arranged on the nut.
Further, the nut includes two lugs disposed opposite each other, and the elongated shank is riveted with one of the lugs of the nut.
Further, the length of the extension handle is equal to two times of the shortest distance between the joint of the extension handle and the nut and the axis of the nut.
Further, the inner wall of the locking hole is provided with a flexible anti-slip pad.
Further, a washer is provided between the nut and the locking member.
Further, a return elastic member is connected between the two handles.
Compared with the prior art, the locking device provided by the invention has the following advantages:
the locking device is applied to the limiting mechanism, in the practical application process, the locking hole of the locking piece is sleeved on the feedback rod, the nut is rotated, so that the nut moves towards the handle direction of the locking piece, the nut pushes one handle to move towards the other handle, and as the other handle is contacted with the end part of the fixing seat, the two handles gradually approach along with the movement of the nut, so that the opening of the locking hole is reduced, and the distance between the locking hole and the feedback rod is gradually reduced, thereby clamping the feedback rod. When the limiting height needs to be adjusted, the nut is unscrewed, the locking piece is moved, the position of the locking piece on the feedback rod is changed, and after the locking piece is adjusted in place, the nut is screwed again so as to fix the locking piece to the current position, so that the adjustment process is completed.
In addition, in the process of screwing the nut, because the lug plate is arranged on the nut, an operator can drive the nut to rotate by screwing the lug plate, so that the nut is manually screwed without using auxiliary tools such as a wrench, and the adjustment operation is more convenient and easy to realize.
When the locking device provided by the invention is used, threads are not required to be arranged on the feedback rod, and when the locking device is impacted, the impact force of the locking device on the feedback rod is smaller, so that the feedback rod is less worn. In addition, even if the feedback rod is worn, the nut can be further screwed, so that the aperture of the locking hole is smaller, and the locking device can still clamp the feedback rod after the feedback rod is worn. And the nut is screwed to adjust without the assistance of other tools, so that the nut can be manually operated, and the operation process is convenient and quick.
The invention further aims to provide a limiting mechanism which solves the technical problems that in the prior art, threads on a feedback rod are easy to wear, so that nuts are loosened, and limiting effect is affected.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the limiting mechanism comprises a feedback rod, and the locking device according to the technical scheme is arranged on the feedback rod.
The limiting mechanism and the locking device have the same advantages compared with the prior art, and are not described in detail herein.
The invention further aims to provide a tractor which solves the technical problems that in the prior art, threads on a feedback rod are easy to wear, so that nuts are loosened, and the limiting effect is affected.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a tractor comprising the limiting mechanism according to the technical scheme.
The tractor and the limiting mechanism have the same advantages as those of the prior art, and are not described in detail herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a structure of a locking device and a feedback rod according to an embodiment of the present invention;
fig. 2 is a schematic diagram II of a structure of a locking device and a feedback rod according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a structure of a locking device and a feedback rod according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a locking device according to an embodiment of the present invention;
fig. 5 is a schematic diagram one of a locking device applied to a limiting mechanism according to an embodiment of the present invention;
fig. 6 is a schematic diagram II of the locking device applied to the limiting mechanism according to the embodiment of the present invention.
In the figure: 11-end; 12-a stem; 21-a locking part; 22-handle; 23-locking holes; 24-a flexible cleat; 31-a nut body; 32-ear plates; 33-an elongate handle; 40-washers; 50-a return elastic member; 100-locking means; 200-a feedback rod; 300-lifting arm; 310-connecting part; 400-manipulating the handle; 500-control valve.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 4, a locking device provided in an embodiment of the present invention includes: fixing base, locking piece and nut, wherein:
the fixing seat comprises an end part 11 and a rod part 12 which are connected with each other, the rod part 12 comprises a threaded section, a nut is arranged on the threaded section, and an ear plate 32 is arranged on the nut; the locking piece comprises a locking part 21 and two handle parts 22, wherein the locking part 21 is arc-shaped, two ends of the locking part 21 are respectively connected with the handle parts 22, the locking part 21 and the handle parts 22 form a U-shaped structure, the two handle parts 22 are sleeved on the rod part 12 of the fixing seat and are positioned between the end part 11 of the fixing seat and the nut, the locking part 21 is provided with a locking hole 23 for the feedback rod 200 to pass through, and the opening of the locking hole 23 faces the rod part 12 of the fixing seat.
The locking device of the embodiment of the invention is applied to a limiting mechanism, in the practical application process, the locking hole 23 of the locking piece is sleeved on the feedback rod 200, and the nut is rotated to enable the nut to move towards the handle portion 22 direction of the locking piece, the nut pushes one handle portion 22 to move towards the other handle portion 22 direction, and as the other handle portion 22 contacts with the end portion 11 of the fixing seat, the two handle portions 22 gradually approach along with the movement of the nut, so that the opening of the locking hole 23 is reduced, and the distance between the locking hole 23 and the feedback rod 200 is gradually reduced, thereby clamping the feedback rod 200. When the limit height needs to be adjusted, the nut is unscrewed, the locking piece is moved, the position of the locking piece on the feedback rod 200 is changed, and after the adjustment is in place, the nut is screwed again to fix the locking piece to the current position, so that the adjustment process is completed.
In addition, in the process of screwing the nut, because the lug plate 32 is arranged on the nut, an operator can drive the nut to rotate by screwing the lug plate 32, so that the nut is manually screwed without using auxiliary tools such as a wrench, and the adjustment operation is more convenient and easy to realize.
With the locking device provided by the embodiment of the invention, the feedback rod 200 does not need to be provided with threads, and when the locking device is impacted, the impact force of the locking device on the feedback rod 200 is smaller, so that the feedback rod 200 is less worn. In addition, even if the feedback rod 200 is worn, the nut can be further tightened so that the aperture of the locking hole 23 is smaller, thereby allowing the locking device to clamp the feedback rod 200 after the feedback rod 200 is worn. Meanwhile, compared with the limiting mechanism in the prior art, which requires two wrenches to rotate simultaneously to adjust the limiting height, the limiting mechanism of the locking device provided by the embodiment of the invention does not need to prepare other auxiliary tools (such as wrenches), and a worker can manually rotate the nut through the lug plate 32, so that the limiting height adjusting process is realized, and the adjusting process is convenient and quick and is easy to operate.
In particular embodiments, the end 11 of the holder has a cross-sectional dimension greater than the cross-sectional dimension of the stem 12, thereby preventing the stem 22 of the locking element from disengaging. The shank 12 of the holder may be provided with threads entirely or only in a partial region.
In a preferred implementation manner of this embodiment, the fixing base adopts a bolt, the head of the bolt is the end 11 of the fixing base, the screw rod of the bolt is the threaded rod 12, and the fixing base is manufactured without separately designing a die, and the bolt of the standard component is adopted, so that the production cost is reduced.
In the direction shown in fig. 2, the locking piece is in a U-shaped structure as a whole, the locking part 21 is located on the left side, the handle part 22 is located on the right side, the left side of the handle part 22 is connected with the locking part 21, the right side is provided with a through hole penetrating through the thickness of the locking part, the axis of the through hole is parallel to the axis of the rod part 12 of the fixing seat, the end part 11 of the fixing seat is located below, the rod part 12 sequentially penetrates through the through holes of the two handle parts 22 from bottom to top, and the nut is screwed in the area of the through hole of the handle part 12 extending out of the handle part 22 located above at the rod part 12, so that the two handle parts 22 are located between the nut and the end part 11 of the fixing seat, and the section size of the end part 11 of the fixing seat is larger than the diameter of the through hole.
The lug plate 32 is mounted on the side or top edge of the nut, and the lug plate 32 and the nut can be connected in a welding mode, or the lug plate 32 and the nut are integrally formed in the manufacturing process, or a disc-shaped nut with the lug plate 32 is adopted. In a preferred implementation of this embodiment, the nut is a disc nut. As shown in fig. 2-4, the disc nut includes a nut body 31 and two lugs 32, the two lugs 32 are connected to the side wall of the nut body 31, and the two lugs 32 are symmetrically arranged, and an operator can drive the nut body 31 to rotate through the two lugs 32, so that the effect of rotating the disc nut is achieved. By the design, the nut and the lug plate 32 do not need to be designed and manufactured independently, the lug plate 32 and the nut are not required to be installed, the production cost is reduced, and the production efficiency is improved.
Further, in a preferred implementation of the present embodiment, the nut includes two lugs 32 disposed opposite each other, and an extension 33 is provided on the nut. When the nut is a disc nut, the extension stem 33 is connected to the lug plate 32 of the disc nut. Because the extension handle 33 is provided, the nut can be screwed by pushing the extension handle 33, so that the arm of force is increased, and the force required for screwing the nut is reduced.
As shown in fig. 3, the number of extension handles 33 is one and is connected to one of the lugs 32 of the disc nut. In addition, the number of the extension handles 33 may be two, and the two extension handles 33 are respectively connected to the two ear plates 32.
Further, the extension stem 33 is riveted with the nut. So arranged, when the nut is to be screwed, the free end of the extension stem 33 is rotated to a position away from the nut (the position shown in fig. 3 and 4) so that the distance between the free end of the extension stem 33 and the axial center of the nut is longer. When the nut is not required to be screwed, the extension handle 33 is reversely rotated, so that the extension handle 33 is rotated to a position shown in fig. 2 (the extension handle 33 is vertical to the rod part 12 of the fixing seat), and in this position, the structure of the locking device is more compact, and the space occupied by the whole structure of the locking device is reduced.
In one embodiment of the present embodiment, the length of the extension stem 33 is equal to two times the shortest distance between the junction of the extension stem 33 and the nut and the axis of the nut. So designed, when the extension handle 33 is in a vertical state with the rod part 12 of the fixed seat, the distance between the two ends of the extension handle 33 and the axis of the nut is equal after the nut is not required to be rotated, the extension handle 33 is rotated inwards.
When the nut is a dish-shaped nut, one end of the extension handle 33 is connected with one end of one of the lugs 32 far away from the nut body 31, and when the extension handle 33 is in a vertical state with the rod portion 12 of the fixing seat, the free end of the extension handle 33 is in contact with the other lug 32. Preferably, as shown in fig. 1, the free end of the extension handle 33 is provided with a limit groove, and when the extension handle 33 is rotated to be perpendicular to the rod portion 12 of the fixing base, the limit groove of the free end of the extension handle 33 is snapped onto the other ear plate 32 (the ear plate 32 not connected to the extension handle 33), and a partial area of the other ear plate 32 is located in the limit groove.
In order to alleviate friction between the locking member and the feedback rod 200, in a preferred implementation of the present embodiment, the inner wall of the locking hole 23 is provided with a flexible non-slip pad 24. So designed, the locking hole 23 contacts with the feedback rod 200 through the flexible anti-slip pad 24, when the feedback rod 200 is clamped by the locking piece, the flexible anti-slip pad 24 deforms, so that the gap between the locking piece and the feedback rod 200 is filled, and the contact area between the locking device and the feedback rod 200 is increased. In addition, the flexible cleat 24 may provide a cushioning vibration reduction effect.
Further, in one embodiment of the present embodiment, a washer 40 is provided between the nut and the locking member. As shown in fig. 1-4, the washer 40 is annular and is located between the nut and the shank 22 of the locking element. The washer 40 may increase the locking force of the nut against the locking member.
Further, a return spring 50 is connected between the two handles 22. When the nut moves toward the end 11 of the fixing base, the distance between the two handles 22 is shortened, the elastic return member compresses while continuing energy, and when the nut moves toward the end 11 of the fixing base, the elastic return member releases energy, returns to the original state, and pushes the handles 22 at the same time, so that the distance between the two handles 22 is increased, and thus the opening of the locking hole 23 is increased, so that the locking device can move along the feedback rod 200.
As shown in fig. 5 and fig. 6, the embodiment of the present invention also provides a limiting mechanism, which includes a feedback rod 200, and the feedback rod 200 is provided with the locking device 100 according to the above technical solution. Specifically, the limiting mechanism further includes a connection portion 310 connected to the rotating end of the lifting arm 300, one end of the connection portion 310 is slidably mounted on the feedback rod 200, one end of the connection portion 310 is mounted with the locking device 100, the other end is connected to the control handle 400, and the control handle 400 is connected to the control valve 500.
In fig. 5, the free end of the lifting arm 300 is in a relatively low position, where the connection 310 is not in contact with the locking device 100; when the lifting arm 300 rotates clockwise from the position shown in fig. 5, the free end of the lifting arm 300 gradually rises in the horizontal plane, the rotating end of the lifting arm 300 rotates while driving the connecting portion 310 to rotate, and one end of the connecting arm slides along the feedback rod 200 until contacting the locking device 100, and the height of the lifting arm 300 is the set highest height. If the set maximum height is to be lowered vertically, the locking device 100 is moved along the feedback lever 200 to a side away from the manipulation handle 400, and thus, after the adjustment, the rotation range of the lifting arm 300 is larger, and the height at which the free end of the lifting arm 300 can be reached is higher.
The embodiment of the invention also provides a tractor which comprises the limiting mechanism.
The advantages of the tractor and the limiting mechanism compared with the prior art are the same, and are not described in detail herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. A locking device, comprising: a fixing seat, a locking piece and a nut,
the fixing seat comprises an end part and a rod part which are connected with each other, the rod part comprises a threaded section, the nut is arranged on the threaded section, and the nut is provided with an ear plate;
the locking piece comprises a locking part and two handle parts, wherein the locking part is arc-shaped, two ends of the locking part are respectively connected with the handle parts, the locking part and the handle parts form a U-shaped structure, the two handle parts are sleeved on the rod part of the fixing seat and positioned between the end part of the fixing seat and the nut, the locking part is provided with a locking hole for a feedback rod to pass through, and the opening of the locking hole faces the rod part of the fixing seat;
the nut is a dish-shaped nut;
an extension handle is arranged on the nut;
the nut comprises two lug plates which are oppositely arranged, and the lug plates are arranged at the edges of the side face or the top face of the nut;
the extension handle is riveted with one of the lugs of the nut; the length of the extension handle is equal to two times of the shortest distance between the joint of the extension handle and the nut and the axis of the nut; the free end of the extension handle is provided with a limit groove;
a return elastic piece is connected between the two handle parts;
the section size of the end part of the fixing seat is larger than that of the rod part;
the inner wall of the locking hole is provided with a flexible anti-slip pad;
a gasket is arranged between the nut and the locking piece;
the fixing seat adopts a bolt, the head of the bolt is the end part of the fixing seat, and the screw rod of the bolt is the rod part provided with threads;
when the nut is a dish-shaped nut, one end of the extension handle is connected with one end of one lug plate far away from the nut body, and when the extension handle is in a vertical state with the rod part of the fixing seat, the free end of the extension handle is contacted with the other lug plate;
when the extension handle is rotated to be vertical to the rod part of the fixed seat, the limit groove at the free end of the extension handle is buckled on the other lug plate, and a part of the area of the other lug plate is positioned in the limit groove;
when the feedback rod is clamped by the locking piece, the flexible anti-slip pad deforms, so that a gap between the locking piece and the feedback rod is filled up, and the contact area between the locking device and the feedback rod is increased; the flexible anti-slip pad has a certain buffering and vibration-damping effect;
the gasket is annular and is positioned between the nut and the handle part of the locking piece, and the gasket increases the locking force of the nut on the locking piece;
the elastic return piece is connected between the two handle parts, when the nut moves towards the direction close to the end part of the fixing seat, the distance between the two handle parts is shortened, the elastic return piece compresses and stores energy, when the nut moves towards the direction far away from the end part of the fixing seat, the elastic return piece releases energy, the elastic return piece returns to the original state, and the handle parts are pushed simultaneously, so that the distance between the two handle parts is increased, the opening of the locking hole is increased, and the locking device moves along the feedback rod.
2. A spacing mechanism comprising a feedback rod having a locking device according to claim 1 disposed thereon.
3. A tractor comprising the spacing mechanism of claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711086440.3A CN109743917B (en) | 2017-11-07 | 2017-11-07 | Locking device, limiting mechanism and tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711086440.3A CN109743917B (en) | 2017-11-07 | 2017-11-07 | Locking device, limiting mechanism and tractor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109743917A CN109743917A (en) | 2019-05-14 |
| CN109743917B true CN109743917B (en) | 2024-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711086440.3A Active CN109743917B (en) | 2017-11-07 | 2017-11-07 | Locking device, limiting mechanism and tractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109743917B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003146283A (en) * | 2001-11-02 | 2003-05-21 | Kokuki Chin | Anti-theft lock structure for saddle of bicycle |
| CN200959719Y (en) * | 2006-06-21 | 2007-10-17 | 宋加昌 | Lifting device for tractor |
| CN204056154U (en) * | 2014-07-01 | 2014-12-31 | 昆山小小恐龙儿童用品有限公司 | Locking securing device is managed by a kind of bicycle handle bar |
| CN104488388A (en) * | 2014-12-30 | 2015-04-08 | 中联重机股份有限公司 | Lifting force generating device and tractor adopting lifting force generating device |
| CN205524722U (en) * | 2016-01-29 | 2016-08-31 | 金通公共自行车（天津）有限公司 | Theftproof quick detach |
| CN207369554U (en) * | 2017-11-07 | 2018-05-18 | 雷沃重工股份有限公司 | Locking system, position-limit mechanism and tractor |
-
2017
- 2017-11-07 CN CN201711086440.3A patent/CN109743917B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003146283A (en) * | 2001-11-02 | 2003-05-21 | Kokuki Chin | Anti-theft lock structure for saddle of bicycle |
| CN200959719Y (en) * | 2006-06-21 | 2007-10-17 | 宋加昌 | Lifting device for tractor |
| CN204056154U (en) * | 2014-07-01 | 2014-12-31 | 昆山小小恐龙儿童用品有限公司 | Locking securing device is managed by a kind of bicycle handle bar |
| CN104488388A (en) * | 2014-12-30 | 2015-04-08 | 中联重机股份有限公司 | Lifting force generating device and tractor adopting lifting force generating device |
| CN205524722U (en) * | 2016-01-29 | 2016-08-31 | 金通公共自行车（天津）有限公司 | Theftproof quick detach |
| CN207369554U (en) * | 2017-11-07 | 2018-05-18 | 雷沃重工股份有限公司 | Locking system, position-limit mechanism and tractor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109743917A (en) | 2019-05-14 |
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