CN1451600A - Body lifting method and lifting device thereby - Google Patents
Body lifting method and lifting device thereby Download PDFInfo
- Publication number
- CN1451600A CN1451600A CN 03124414 CN03124414A CN1451600A CN 1451600 A CN1451600 A CN 1451600A CN 03124414 CN03124414 CN 03124414 CN 03124414 A CN03124414 A CN 03124414A CN 1451600 A CN1451600 A CN 1451600A
- Authority
- CN
- China
- Prior art keywords
- stem
- roller
- self
- lock tube
- locking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
A method and apparatus for lifting up or lowering down object are disclosed. A smooth mandrel is used to directly act on the object. The rollers are contained in a inclined slot between an inclined plane and the surface of mandrel. When the inclined plane is lifted by external force, the rollers are wedged and the mandrel is also lifted up by friction force. When inclined plane is static, the rollers are wedged by the dead weight of mandrel and object and the mandrel is self-locked by friction force. When the rollers are loosened, the mandel is lowered down by its dead weight. Its advantages are high self-locking performance, high efficiency and long service life.
Description
Technical field:
The present invention relates to a kind of method of lifting object and use the jacking system of this method.
Background technology:
In known technology, the method for manual type lifting object has hydraulic method, pneumatic process, mechanical spiral method.Hydraulic method has bigger top lift, and good self-locking property is arranged, but implements the technical requirements height of this method, as hydraulic lift, its structure is complicated, the requirement on machining accuracy height, sealing property requires, maintenance requirement professional, and also its effective forced stroke is limited by oil mass.Though the pneumatic process self-locking property is good, top lift is little, as the chair jacking system, almost can not rise by on-load, can only bear load after rising again, therefore use and limited to, and once gas leakage can't be repaired, service life is short.The machinery spiral method, though stronger bearing capacity is arranged, self-locking property is also better, consider that operation is laborsaving, its lift angle is generally all in 4-6 degree scope, so ascending velocity is slow, particularly when jacking system when need top object distance is big, more reflect the inefficient shortcoming of this jacking system.
Summary of the invention:
It is big to the invention provides a kind of top lift, and self-locking performance is good, and is simple in structure, make require low, long service life, high efficiency, the method for the unrestricted lifting object of rapid operation, adjustable height and service orientation and use the jacking system of this method.
The method of lifting object of the present invention is: with smooth stem as by the direct acting body of lifting object, the skewed slot that forms with angular plane surface that axially forms an angle with stem and stem cylinder folds up roller, the opening of described angle is towards the direction of improvement of stem, roller contacts with stem cylinder and angular plane surface with its cylinder, and its axis and stem axis normal; Promote described angular plane surface with external force, roller is by wedging, and the outer power of frictionally transmission drives stem and promotes, and perhaps directly promotes stem with external force; When angular plane surface maintained static, the pressure that stem leans on its deadweight or executed by the jack-up object made roller by wedging, and the friction force self-locking that stem is granted by roller when stem descends, is stirred roller to the stem direction of improvement, and stem descends by its deadweight or external force.
Guarantee in the said method that roller contacts with the cylinder and the angular plane surface of stem with its cylinder all the time, the axial angle of angular plane surface and stem is a 5-15 degree scope.
Use said method design-calculated jacking system, comprise smooth stem, base, also comprise suit on the stem have described angular plane surface from lock tube, be fastenedly connected from lock tube and base, the cylinder of described angular plane surface and stem forms the self-locking skewed slot, this skewed slot has folded up the self-locking roller, and self-locking puts is equipped with the auto-lock shifting fork that is used to stir the self-locking roller.
Self-locking is provided with the shell fragment that the self-locking roller is contacted with the cylinder and the described angular plane surface of stem with its cylinder all the time above putting and being positioned at the self-locking roller.
Use the another jacking system of the inventive method design-calculated to comprise smooth stem, base, control member, also comprise the lift lug that has described angular plane surface of suit on the stem and from lock tube, be used for the straight-line guiding mechanism of lift lug, lift lug and from lock tube respectively with angular plane surface at least two places around the stem evenly arrange respectively, lift lug and form respectively from angular plane surface that lock tube is with and stem cylinder and to promote skewed slot and self-locking skewed slot, wherein folded up respectively and promoted roller and self-locking roller, be fastenedly connected from lock tube and base, base has the structure that stem can pass through, base or hinged from lock tube and control member, there are two to drive the cam that lift lug rises on the control member, lift lug and be equipped with respectively from lock tube and be used to stir roller and make the auto-lock shifting fork that stem descends and promote shift fork is hinged with the connecting rod that makes two shift fork synchronization actions between two shift forks.
The lift lug of described jacking system reaches and is respectively arranged with swash plate from lock tube, and swash plate is provided with Baltimore groove, and the bottom surface of this groove is as described angular plane surface, and two sides are each roller spigot surface.
For jacking system can be worked under various orientation, be positioned at the top that promotes roller and self-locking roller on described lifting swash plate and the self-locking swash plate and be equipped with shell fragment, lift lug and between lock tube, be connected with returning pull-spring.
Be used for the fitting surface that the straight-line guiding mechanism of lift lug is arranged on lift lug and stem, the fitting surface of the two to small part is the plane, and described stem top is provided with positioning plate.
The radial position of plane on stem that is used for the lift lug guiding on the stem is positioned at and promotes roller and self-locking roller position.
Be equipped with on the self-locking cover jacket wall and be used for the descend damper element of forming by spring, steel ball set screw of buffering of stem, have cushion hole on the stem.
The method of lifting object of the present invention is a kind of new method, all do not have in the known technology, it is to promote or pin stem by the friction of roller in skewed slot, therefore the collapsing length of stem is arbitrarily, also is arbitrarily to object up-down, do not limited to and work firm, self-locking performance is good, technical requirements was low when this method was implemented, and cost is also low, does not need the input of main equipment.
Use a kind of jacking system of the inventive method design-calculated, outer power directly draws high (or stretching) stem, when drawing high (or stretching) stem, owing to be fixed on the base motionless from lock tube, therefore the self-locking roller is in the free floating state, stem can be like a cork almost non-resistance ground be pulled to arbitrary height (or length) rapidly, when being subjected to the power of being bestowed by the lifting object, stem is return trend, this moment, the self-locking roller was subjected to friction force that stem bestows and by wedging, thereby stem is locked and can't returns, as desires to make stem to return, and only needs roller is pushed aside.Thereby reliable operation of the present invention, self-locking performance is good, simultaneously can any direction work, and as level, inclination, inversion etc.
Use the another kind of jacking system of the inventive method design-calculated, in fact comprised the lift portion of stem and from the sloping portion of latching segment and stem, when the positive stroke of lift lug of lift portion, roller in its skewed slot is by wedging, the friction force that stem is bestowed by roller rises with lift lug, because the rising of stem is captiveed joint motionless from lock tube with base, make the roller in the lock tube skewed slot be in the free floating state, thereby stem almost is raised (not considering external force) non-resistance.When the lift lug reversal of stroke, stem is under the action of gravity of himself or under by the effect of the lifting object institute application of force, the trend of (to being subjected to force direction) motion is downwards arranged, make roller towards skewed slot closing in direction by wedging, thereby stem is produced friction force upwards, stop the falling tendency of stem, lock stem thus.Also be to be subjected to resistance hardly during the lift lug reversal of stroke, this is because the friction force of dehiscing direction for synclinal bend of roller during the lift lug reversal of stroke, roller under the effect of this friction force, the synclinal bend direction motion of dehiscing, be in the free floating shape very soon, the reversal of stroke of lift lug is carried out fast.Therefore when the positive stroke of lift lug, catch stem rise together (to by the lifting object space to moving), during reversal of stroke, catch stem to keep rise height from lock tube, going round and beginning again makes constantly rising step by step of stem, reaches the purpose of lifting object.When stem descends (returning), only need to have dialled roller with shift fork, stem is decline (returning) rapidly just.The stem of jacking system of the present invention can be provided with its length as required arbitrarily, as long as mechanical strength meets the demands, when basal plane that jacking system was located in from the lifting object distance greatly the time, direct pull-up stem, contact needs the object of lifting rapidly, has improved work efficiency thereby save time.
The inventive method design-calculated lifting device structure is simple, making is easy, adjustable height is unrestricted, service life is very long because of using, under the artificial destruction situation generally not being can be not bad, these advantages be prior art can't be obtained, while reliable operation of the present invention, top lift is big, self-locking performance is good, rapid operation.
Description of drawings:
Fig. 1 is the structural representation of a kind of jacking system of the present invention.
Fig. 2 is the cutaway view of Fig. 1 along A-A.
Fig. 3 is the another kind of lifting device structure scheme drawing of the present invention.
Fig. 4 is the longitudinal diagram of Fig. 3.
Fig. 5 is that the A of Fig. 3 is to view.
The specific embodiment:
As can be seen from Figure 1, use a kind of jacking system of elevating method design-calculated of the present invention comprise smooth stem 1, base 7, stem 1 outer suit from lock tube 5, base 7 be fastenedly connected from lock tube 5, the form of base 7 be real for the attaching parts of motionless basal plane (with respect to by the lifting object).Be provided with the self-locking swash plate 10 of angular plane surface 2 described in band the inventive method from lock tube 5, angular plane surface 2 forms self-locking skewed slot 3 with the cylinder of stem 1, be placed with self-locking roller 4 in this skewed slot, when the stem 1 of this jacking system is when upwards stretching work with vertical direction, will be after lock tube 5 be fixed, directly with force-extension stem 1 to desired height, when being pressed down stem 1 by the gravity of jacking object, this moment, stem 1 had falling tendency, self-locking roller 4 is subjected to the friction of stem 1 by wedging, and self-locking this moment roller 4 imposes friction force to stem 1, has stoped stem 1 to glide, stem 1 is lockable, thereby steadily withstands object.Preferably be provided with Baltimore groove 11 on the self-locking swash plate 10, as described inclined-plane, both sides are as the spigot surface of self-locking roller 4 with the bottom surface of this groove.If desire to make the jacking system of the present invention can be with various direction work, above self-locking roller 4, be provided with the shell fragment 12 that the cylinder that guarantees self-locking roller 4 all the time contacts with the cylinder and the described angular plane surface 2 of stem 1 on the self-locking swash plate 10, the most handy a few font shell fragments of this shell fragment, in conjunction with Fig. 2 as can be seen, when needs stem 1 is return (decline), the auto-lock shifting fork 17 that is used for loosening self-locking roller 4 has been installed on lock tube 5, with dialling (drawing high direction to stem holds together) self-locking roller 4 on the auto-lock shifting fork 17, self-locking roller 4 no longer produces friction to stem 1, and stem 1 is not return with being obstructed under external force.
Fig. 3 to Fig. 5 shows and uses the another kind of jacking system of the inventive method design-calculated.
As can be seen from Figure 3, use the jacking system of the method for lifting object of the present invention to comprise stem 1, lift lug 6, from lock tube 5, base 7, control member 8, wherein base 7 is the stent-type base, it with captive joint from lock tube 5, lift lug 6 is positioned at the top from lock tube 5, in conjunction with Fig. 4 as can be seen, lift lug 6 and all be enclosed within on the stem 1 from lock tube 5, lift lug 6 and basic identical from lock tube 5 structures, be that the bottom is a cover, top respectively is provided with two swash plates---and two on the lift lug 6 promotes swash plate 10a and two self-locking swash plates 10 on lock tube 5, promote on swash plate 10a and the self-locking swash plate 10 and be equipped with Baltimore groove 11, the bottom surface of this groove is promptly as the angular plane surface 2 that reaches described in the inventive method, it axially becomes 7-9 degree angle with stem 1, this angle direction of dehiscing is identical with lift lug 6 positive stroke directions, and the two sides of Baltimore groove 11 are used to promote roller 4a and self-locking roller 4 guiding.Promote be positioned on swash plate 10a and the self-locking swash plate 10 promote roller 4a and self-locking roller 4 above be equipped with shell fragment 12, lift lug 6 and between lock tube 5, be connected with returning pull-spring 13, make jacking system of the present invention when working with any direction, as jacking system horizontal, inversion, tilting etc., promote roller 4a and self-locking roller 4 and all be in the preparation work state.In order to guarantee the straight line back and forth movement of lift lug 6 on stem 1, the guiding mechanism 14 that provides for it is arranged on the fitting surface of lift lug 6 and stem 1, the fitting surface of the two to small part is the plane, Fig. 3 illustrates the radial position of this plane on stem 1 and is positioned at lifting roller 4a and self-locking roller 4 positions, certainly the guiding of the straight line back and forth movement of lift lug 6 also can be by at base 7 or from the affixed guide groove that cooperatively interacts (post) on the lock tube 5 and on the lift lug 6.See Fig. 1 again, control member 8 is hinged on lock tube 5, two cams 9 are arranged on the control member 8, be distributed in the both sides on the lift lug 6, and act on the corresponding evagination 15 of lift lug 6, cam 9 is provided with stroke limit spare (hook) 16, the end position that lift lug 6 is descended is not less than from lock tube 5 tops, when external force acts on control member 8 downwards, control member 8 is fulcrum with it at the hinge-point on lock tube 5, cam 9 is rotated around this fulcrum, move up thereby drive lift lug 6, promote lifting roller 4a among the skewed slot 3a this moment by wedging, stem 1 is promoting upward movement under the friction force effect that roller 4a bestows, 4 upward movements owing to stem 1 of self-locking roller in the self-locking this moment skewed slot 3 are in the free floating state, make stem 1 upward movement very swimmingly.When control member 8 resets, lift lug 6 moves downward, run to spacing position until cam 9, in this process, the lifting roller 4a that promotes among the skewed slot 3a is in the free floating state, stem 1 loses this lifting roller 4a to its friction force of bestowing and desire falls, self-locking roller 4 in this moment self-locking skewed slot 3 is subjected to the downward friction force of stem 1 by wedging, stem 1 is produced a friction force that makes progress, stoped stem 1 whereabouts trend and stem 1 has firmly been pinned, keep that rise is constant, so move in circles, stem 1 is constantly risen step by step.
If desire to make stem 1 to descend, from Fig. 3-Fig. 5 as can be seen, lift lug 6 reaches to be equipped with respectively on lock tube 5 and promotes shift fork 17a and auto-lock shifting fork 17, the fork arm of two shift forks is arranged on each roller below, be hinged with connecting rod 18 between two shift forks, wherein promoting shift fork 17a leans on an end of connecting rod 18 to be designed to angle, other has the quarter butt 19 of a band angle and lifting shift fork 17a angle end to be connected through the hinge, this hinge can only rotate in the V-shaped part that quarter butt 19 and lifting shift fork 17a angle end form, and the other end and the connecting rod 18 of quarter butt 19 are hinged simultaneously.When making lift lug 6 upward movements, two shift forks are in horizontality, can not stir corresponding roller, when downward this connecting rod 18 of pulling, two shift forks are fulcrum with it at lift lug 6 or the attachment point on lock tube 5, upwards stir roller, make stem 1 lose the friction force that each roller is bestowed, descend rapidly by its deadweight.If when jacking system was in other direction work, such as directions such as level, inclination, inversions, returning of stem 1 can be executed external force to stem 1 and get final product after dial each roller slightly.The pulling of present embodiment connecting rod 18 is to be provided with a short handle 20 on the connecting rod 18, is positioned at the below of the cross bar 21 on the control member 8, and when control member 8 moved downward desired location, cross bar 21 acted on short handle 20, and pulling connecting rod 18 moves down.Too big for preventing that stem 1 from impacting when falling, the damper element of being made up of spring, steel ball and set screw 22 is housed putting from lock tube 5 walls, stem 1 is provided with cushion hole 23, damper element 22 is at least one group (is one group with radial position), can be more than two groups or two groups, the group number of cushion hole 23 can be more than the group number of damper element 22, and the axial spacing that damper element is 22 is different with the axial spacing of 23 of cushion holes, makes the staggered action of every group of damper element.
Another embodiment with the jacking system of the inventive method is: the base 7 of above-mentioned embodiment is designed to the bush support formula, lift lug 6 is arranged on the top of base sheath, be arranged on the top of lift lug 6 from lock tube 5, be fixed on the sleeve of base 7 by fixed beam from lock tube 5, this fixed beam can be used as the guide of lift lug 6 linear movement guides simultaneously, control member 8 is hinged on the base sheath, cam 9 on the control member 8 still acts on lift lug 6, and its principle of work is identical with a last embodiment.
Claims (10)
1, a kind of method of lifting object, it is characterized in that: with smooth stem as by the direct acting body of lifting object, the skewed slot that forms with angular plane surface that axially forms an angle with stem and stem cylinder folds up roller, the opening of described angle is towards the direction of improvement of stem, roller contacts with stem cylinder and angular plane surface with its cylinder, and its axis and stem axis normal; Promote described angular plane surface with external force, roller is by wedging, and the outer power of frictionally transmission drives stem and promotes, and perhaps directly promotes stem with external force; When angular plane surface maintained static, the pressure that stem leans on its deadweight or executed by the jack-up object made roller by wedging, the friction force self-locking that stem is granted by roller; When stem descended, to the loosening roller of stem direction of improvement, stem descended by its deadweight or external force.
2, the method for a kind of lifting object according to claim 1 is characterized in that: guarantee that roller contacts with the cylinder and the angular plane surface of stem with its cylinder all the time, the axial angle of angular plane surface and stem is a 5-15 degree scope.
3, a kind of jacking system that uses claim 1,2 described methods, comprise smooth stem (1), base (7), also comprise stem (1) go up suit have described angular plane surface (2) from lock tube (5), be fastenedly connected from lock tube (5) and base (7), described angular plane surface (2) forms self-locking skewed slot (3) with the cylinder of stem (1), this skewed slot has folded up self-locking roller (4), and the auto-lock shifting fork (17) that is used to stir self-locking roller (4) is housed on lock tube (5).
4, jacking system according to claim 3 is characterized in that: be positioned at self-locking roller (4) top and be provided with the shell fragment (12) that self-locking roller (4) is contacted with the cylinder and the described angular plane surface (2) of stem (1) all the time with its cylinder on lock tube (5).
5, a kind of use claim 1, the jacking system of 2 described methods, comprise smooth stem (1), base (7), control member (8), it is characterized in that: comprise also that stem (1) is gone up the lift lug that has described angular plane surface (2) (6) of suit and from lock tube (5), be used for the straight-line guiding mechanism of lift lug (6) (14), lift lug (6) and from lock tube (5) respectively with angular plane surface (2) arrange respectively evenly at least two places on every side at stem (1), lift lug (6) and from lock tube (5) the angular plane surface of being with (2) and stem (1) cylinder form respectively and promote skewed slot (3a) and self-locking skewed slot (3), lifting roller (4a) and self-locking roller (4) have wherein been folded up respectively, be fastenedly connected from lock tube (5) and base (7), base (7) has the structure that stem (1) can pass through, base (7) or hinged from lock tube (5) and control member (8), there are two to drive the cam (9) that lift lug (6) rises on the control member (8), lift lug (6) and auto-lock shifting fork (17) and the lifting shift fork (17a) that is used to stir each roller and stem (1) is descended is housed from lock tube (5) respectively is hinged with the connecting rod (18) that makes two shift fork synchronization actions between two shift forks.
6, jacking system according to claim 5, it is characterized in that: lift lug (6) reaches from lock tube (5) and is respectively arranged with lifting swash plate (10a) and self-locking swash plate (10), two swash plates are provided with Baltimore groove (11), the bottom surface of this groove is as described angular plane surface (2), and two sides are each roller spigot surface.
7, jacking system according to claim 6, it is characterized in that: be positioned at the top that promotes roller (4a) and self-locking roller (4) on described lifting swash plate (10a) and the self-locking swash plate (10) and be equipped with shell fragment (12), lift lug (6) and between lock tube (5), be connected with returning pull-spring (13).
8, according to claim 5 or 6 described jacking systems, it is characterized in that: be used for the fitting surface that the straight-line guiding mechanism of lift lug (6) (14) is arranged on lift lug (6) and stem (1), the fitting surface of the two to small part is the plane, and described stem (1) top is provided with positioning plate (24).
9, jacking system according to claim 8 is characterized in that: the radial position of plane on stem (1) that is used for lift lug (6) guiding on the stem (1) is positioned at and promotes roller (4a) and self-locking roller (4) position.
10, jacking system according to claim 9 is characterized in that: be equipped with on lock tube (5) jacket wall and be used for the descend damper element of being made up of spring, steel ball set screw (22) of buffering of stem (1), have cushion hole (23) on the stem (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03124414 CN1451600A (en) | 2003-05-26 | 2003-05-26 | Body lifting method and lifting device thereby |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03124414 CN1451600A (en) | 2003-05-26 | 2003-05-26 | Body lifting method and lifting device thereby |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1451600A true CN1451600A (en) | 2003-10-29 |
Family
ID=29222879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03124414 Pending CN1451600A (en) | 2003-05-26 | 2003-05-26 | Body lifting method and lifting device thereby |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1451600A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101249638B (en) * | 2008-03-20 | 2010-06-02 | 北京古日机电科技有限公司 | Device driving object up-down and automatic grinding mill |
| CN102020221A (en) * | 2010-04-14 | 2011-04-20 | 株式会社吉田铁工所 | Lifting device |
| CN106185353A (en) * | 2015-05-13 | 2016-12-07 | 卡格贝莫股份公司 | For the beam that shuttles back and forth of conveying carriage upper-part, with cargo transfer equipment and the cargo transfer method of such beam that shuttles back and forth |
| CN111397319A (en) * | 2020-04-08 | 2020-07-10 | 陈辉 | Medicinal material baking device |
-
2003
- 2003-05-26 CN CN 03124414 patent/CN1451600A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101249638B (en) * | 2008-03-20 | 2010-06-02 | 北京古日机电科技有限公司 | Device driving object up-down and automatic grinding mill |
| CN102020221A (en) * | 2010-04-14 | 2011-04-20 | 株式会社吉田铁工所 | Lifting device |
| CN106185353A (en) * | 2015-05-13 | 2016-12-07 | 卡格贝莫股份公司 | For the beam that shuttles back and forth of conveying carriage upper-part, with cargo transfer equipment and the cargo transfer method of such beam that shuttles back and forth |
| CN111397319A (en) * | 2020-04-08 | 2020-07-10 | 陈辉 | Medicinal material baking device |
| CN111397319B (en) * | 2020-04-08 | 2021-09-21 | 贵州同德药业有限公司 | Medicinal material baking device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2792691Y (en) | Imprved mechanism of screw and elastic gasket combining machine | |
| CN108328514A (en) | A kind of automation jacking apparatus | |
| CN1451600A (en) | Body lifting method and lifting device thereby | |
| CN1133406A (en) | Double-gear hydaulic cylinder type operation device | |
| CN211841890U (en) | Lifting working table | |
| CN111874604A (en) | Book pushing structure | |
| US4306463A (en) | Long stroke pump jack | |
| CN109911806B (en) | Vertical lifting and pitching adjusting integrated lifting mechanism | |
| CN115341779A (en) | Reinforcing apparatus of road construction building | |
| CN112942138B (en) | High-precision walking pushing equipment | |
| CN213080371U (en) | Steel reinforcement cage strutting arrangement and steel reinforcement cage seam welder | |
| CN219911620U (en) | Rotary cantilever mechanism | |
| CN118083839B (en) | Hydraulic jacking device for transversely moving heavy objects | |
| CN221048384U (en) | A mounting platform for industrial robot makes | |
| CN215565838U (en) | Hydraulic pipe extractor | |
| CN218952190U (en) | Collapse-preventing supporting structure | |
| CN220999115U (en) | Double linkage elevator | |
| CN219546585U (en) | Multistage hydro-cylinder jacking device | |
| CN110952796B (en) | Full-automatic translation device of building | |
| CN219449104U (en) | Hydraulic adjusting device for hanging basket lifting | |
| CN211759920U (en) | Positioning device for ball valve seat | |
| CN111332983B (en) | Fork device and carrying equipment | |
| CN219479488U (en) | Single power source lifting folding mechanism and furniture | |
| CN212314862U (en) | Book pushing structure | |
| CN118145535B (en) | Combined hydraulic jack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |