CN202911617U - Semi-trailer and overturning telescopic combined lock on the same - Google Patents
Semi-trailer and overturning telescopic combined lock on the same Download PDFInfo
- Publication number
- CN202911617U CN202911617U CN 201220609482 CN201220609482U CN202911617U CN 202911617 U CN202911617 U CN 202911617U CN 201220609482 CN201220609482 CN 201220609482 CN 201220609482 U CN201220609482 U CN 201220609482U CN 202911617 U CN202911617 U CN 202911617U
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- lock
- upset
- pin
- tumble
- flexible combination
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Abstract
Provided are a semi-trailer and overturning telescopic combined locks on the semi-trailer. The semi-trailer comprises a cross beam and the overturning telescopic combined locks arranged at two ends of the cross beam. Each overturning telescopic combined lock comprises a fixing lock seat, a pin lock and an overturning lock. Each fixing lock seat comprises a base seat, a pin shaft arranged on the base seat and a pin hole formed in the base seat. Each pin lock comprises a pin rod and an operation handle fixed on each pin rod, wherein each pin rod is inserted in each pin hole, and each inserting end extends out of each base seat. Each overturning lock comprises an overturning lock seat, a lock core and a handle, wherein each overturning lock seat is connected on each pin shaft in a hinged mode and is capable of rotating relative to each pin shaft, each lock core is installed on each overturning lock seat, and each handle is fixedly connected with each lock core and is capable of driving each lock core to rotate. Each overturning lock is capable of rotating around each pin shaft to a first position abreast with the horizontal direction of each fixing lock seat and to a second position overlapped with the vertical direction of each fixing lock seat. Each overturning telescopic combined lock adopt an overturning lock design, the problem of height interference does not exist between each pin lock and each fixed lock, the height of the cross beam is reduced, and the problem of driving safety is resolved.
Description
Technical field
The utility model relates to the superimposed trailer field, relates in particular to the lock construction in order to locking of container on the superimposed trailer crossbeam.
Background technology
Existing framework semi-trailer is all installed lock and fixing lock at every end of superimposed trailer crossbeam usually, lock is in order to mate the freight container of a certain or several sizes, fixing lock is in order to mating another kind or the freight container of several sizes in addition, thereby realizes the fixedly freight container of different size of a kind of superimposed trailer coupling.The crossbeam of this superimposed trailer will at one end be installed lock and fixing lock simultaneously, usually will fix locking and fix on crossbeam top, is transverse in lock on the crossbeam and is positioned to fix the lock below.Handle for fear of lock and fixing lock rotates and the generation interference, needs end carriage is done height, to improve fixing lock, its handle is tried one's best away from the handle of lock.But can increase the car load height so again, the car load center of gravity is higher after being contained in goods, is unfavorable for driving safety.
Summary of the invention
The technical problems to be solved in the utility model is to overcome the deficiency that above-mentioned prior art exists, and a kind of superimposed trailer is proposed and the flexible combination lock of upward overturning, it is by adopting the tumble lock design, make lock and fixedly lock do not exist the height interference problem, so that the crossbeam height can reduce, solved Exploration on Train Operation Safety.
For solving the problems of the technologies described above, the utility model proposes a kind of flexible combination lock of upset of superimposed trailer, it is characterized in that, comprising: fixedly lock, lock and tumble lock, fixedly lock comprises pedestal, is installed in the bearing pin on the pedestal and is opened in pin-and-hole on the pedestal; Lock comprises pin rod and the lever that is fixed on the pin rod, and described pin rod inserts described pin-and-hole and insertion end is stretched out described pedestal; Tumble lock comprises: upset lock, lock core and handle, described upset lock is hinged on the described bearing pin and can rotates with respect to described bearing pin, described lock core is installed on the described upset lock, and described handle is captiveed joint with described lock core and can be driven described lock core rotation; Described tumble lock can turn to and described fixedly lock side by side first orientation in the horizontal direction around described bearing pin, and, with described fixedly lock in the overlapping second orientation of vertical direction.
Preferably, the pedestal of described fixedly lock comprises: a diapire and the two side that is connected to the diapire two ends, and described diapire and described two side are encircled into U-shaped; Described upset lock comprises: a top board and be vertically connected on respectively the biside plate at the two ends of top board the same side.
Preferably, the flexible combination lock of described upset also comprises: in order to described tumble lock is limited in the first stop gear of first orientation.
Preferably, described the first stop gear comprises: be connected to the positioning plate between the two side of described pedestal and be arranged on limited step on the biside plate of described upset lock, when described tumble lock turned to first orientation, described limited step propped up described positioning plate.
Preferably, described the first stop gear also comprises: be connected to the stop catch plate between the biside plate of described upset lock, be provided with fixed orifice on described positioning plate and the described stop catch plate, when described tumble lock turns to first orientation, described stop catch plate blocks described positioning plate, and the fixed orifice on the described stop catch plate is aimed at the fixed orifice on the described positioning plate.
Preferably, the flexible combination lock of described upset also comprises: in order to described tumble lock is limited in the second stop gear of second orientation.
Preferably, described the second stop gear comprises: a clamp and a dividing plate, described clamp and described dividing plate all are connected between the two side of described pedestal, described pin-and-hole is arranged on the described clamp, be provided with the perforation of inserting for described pin rod on the described dividing plate, described lock core comprises that a tapered end and that exposes to described upset lock is inserted in the described upset lock and can be at the moving locking bar of upset lock transfer, described tapered end is elongate structure, when described tumble lock turn to second orientation, described tapered end inserts by described clamp, described dividing plate, in the cavity volume that described two side and described diapire are encircled into, rotate described tapered end and can make its two ends tighten respectively described clamp and described dividing plate.
Preferably, one fixture block is set on the described pin rod, one position-limited trough is set on the described fixture block, and described pin-and-hole comprises: with the curved portions of described pin rod profile coupling and the special-shaped section of mating with described fixture block profile, the outer rim of the curved portions of described position-limited trough and described pin-and-hole fastens.
Preferably, described tumble lock also comprises a hasp in order to fixing described handle, and an end of described hasp is hinged on the described upset lock by twisted axis, and the other end of described hasp is provided with a draw-in groove that mates with described handle.
For solving the problems of the technologies described above, the utility model also proposes a kind of superimposed trailer, comprises main car frame, and described main car frame comprises the crossbeam of at least one horizontally set, also comprise the flexible combination lock of at least one pair of upset, the flexible combination lock of two described upsets that arrange in pairs is arranged on the two ends of each crossbeam.
Compared with prior art, the utlity model has following beneficial effect: the flexible combination lock of upset of the present utility model is by adopting the tumble lock design, when tumble lock is used, turning to fixing lock side by side position in the horizontal direction, and lock is when using, tumble lock can be turn to again with fixing lock in the overlapping position of vertical direction, thereby the problem that the handle height that has solved two locks is interfered, make under the prerequisite that satisfies intensity, rigidity, can get the height design of crossbeam lower, effectively reduce the car load height, be conducive to traffic safety.
Description of drawings
Fig. 1 is the constructional drawing of superimposed trailer front portion.
Fig. 2 is the STRUCTURE DECOMPOSITION figure of the flexible combination lock of upset.
Fig. 3 for the flexible combination lock of upset turn to the fixing overlapping process of lock in, lock core is in the structural representation of released state.
Fig. 4 for the flexible combination lock of upset turn to the fixing overlapping process of lock in, lock core is in the structural representation of lockup state.
Fig. 5 turn to and the fixing lock structural representation of state side by side for the flexible combination lock of upset.
Fig. 6 is the lateral plan of superimposed trailer shown in Figure 1 front portion.
The specific embodiment
In order to further specify principle of the present utility model and structure, now by reference to the accompanying drawings preferred embodiment of the present utility model is elaborated.
Consult Fig. 1 superimposed trailer of the present utility model and comprise a main car frame, this main car frame comprises that two longerons 1 and that vertically arrange laterally are connected to the crossbeam 2 on two longerons 1, respectively connect a flexible combination lock 3 of upset at the two ends of crossbeam 2, the flexible combination lock 3 of upset both can adopt welding manner to be connected with crossbeam 2, also can adopt the fasteners such as bolt to be connected on the crossbeam 2, also can adopt integrated mode to be arranged on the crossbeam two ends.
Consult Fig. 2, the flexible combination lock of this upset comprises: fixedly lock 31, a lock 32 and a tumble lock 33.
Fixedly lock 31 comprises: pedestal, be fixed on the bearing pin 316 on the pedestal and the pin-and-hole 3131(that is opened on the pedestal consults Fig. 3).Pedestal comprises: a diapire 311 and the two side 312 that is connected to diapire 311 two ends, diapire 311 and two side 312 roughly are encircled into U-shaped.Be provided with the axis hole 3121 for hinging pin shaft 316 on the two side 312, insert respectively in the axis hole 3121 of two side 312 at the two ends of bearing pin 316, and be enclosed within the two ends of bearing pin 316 by two elastic plain washers 3161, prevents that bearing pin 316 is with respect to the pedestal shifted laterally.
Tumble lock 33 comprises: upset lock 331, lock core 332 and handle 333.Upset lock 331 comprises: a top board 3311 and be vertically connected on respectively the biside plate 3312 at the two ends of top board 3311 the same sides.One axis hole 3315 respectively is set on the biside plate 3312, passes for bearing pin 316 and establish wherein, thereby upset lock 331 is hinged on the bearing pin 316 and can rotates with respect to bearing pin 316.One lock core base is set on the top board 3311, a through hole 3313 is set at the middle part of lock core base.Lock core 332 comprises that a tapered end 3321 and is fixed on the locking bar 3322 of tapered end 3321 bottoms, locking bar 3322 is inserted in the through hole 3313 of upset lock 331 and can rotates in the through hole 3313 of upset lock 331, tapered end 3321 tapered ends are elongate structure, and it exposes to the outside of upset lock 331.Handle 333 comprises: a locking lever sleeve 3332 and is fixed on the roughly L-shaped handle 3331 that holds on the locking lever sleeve 3332, locking lever sleeve 3332 is set with on the locking bars 3322 and passes through bolt 3333 and fix with locking bar 3322, and rotation is held handle 3331 and can be driven locking bar 3322 and then drive tapered end 3321 rotations.Tumble lock 33 also comprises a hasp 334 in order to fixed handle 333, one end of hasp 334 is hinged on the wherein side plate 3312 of upset lock 331 by twisted axis 3341, the other end of hasp 334 is provided with a draw-in groove 3342 that mates with handle 333, when handle 333 drive tapered ends 3321 rotate in place, can stir hasp 334, make handle 3331 parts of holding of handle 333 snap in hasp 334 and say in my draw-in groove 3342, thereby with handle 333 pinnings (as shown in Figure 5).
Because tumble lock 33 can rotate around bearing pin, so tumble lock 33 can be swung down to and fixing lock 31 side by side first orientation in the horizontal direction, can also upwards turn to fixing lock 31 in the overlapping second orientation of vertical direction.
For tumble lock 33 is limited to first orientation, the flexible combination lock of this upset also comprises one first stop gear.This first stop gear can be well known structures common in the prior art, as: at upset lock 331 and fixedly on the lock 31 pin-and-hole is set all, when tumble lock 33 turn to first orientation, utilize latch to insert pin-and-hole and tumble lock 33 is locked in first orientation; Perhaps, in tumble lock 33 fixture block is set, and at fixing lock 31 draw-in groove is set, when tumble lock 33 turn to first orientation, utilize fixture block to cooperate with draw-in groove tumble lock 33 is locked in first orientation.
Preferred embodiment, the first stop gear comprises: be connected to the positioning plate 315 between the two side 312 of pedestal and be arranged on limited step 3317 on the biside plate 3312 of upset lock 331, when tumble lock 33 is swung down to first orientation, limited step 3317 blocks positioning plate 314, thereby stops further upset downwards of tumble lock 33.
Preferred embodiment, the first stop gear also comprises: be connected to the upset lock 331 biside plate 3312 between stop catch plate 3316(consult Fig. 5), when tumble lock 33 turned to first orientation, stop catch plate 3316 stoped further upset downwards of tumble lock 33 against positioning plate 315.
Preferred embodiment, for stoping upwards upset of tumble lock 33, on positioning plate 315 and stop catch plate 3316, also respectively be provided with a fixed orifice 3151,3318, when tumble lock 33 is swung down to first orientation, fixed orifice 3151 on the positioning plate 315 and the fixed orifice on the stop catch plate 3,316 3318 are aimed at, at this moment, only needing an anchor shaft to pass two fixed orifices 3151,3318 can fix the two.For rationally utilizing existing structure, present embodiment serves as anchor shaft with lock 321, realizes that positioning plate 315 and stop catch plate 3316 are fixing.
For preventing 33 rotations of positioning plate 315 interference tumble lock, the part in corresponding fixed orifice 3151 both sides, the top of positioning plate also is respectively arranged with dodges groove 3152, same, also is provided with the breach 3314 of dodging positioning plate 315 on the top board 3311 of tumble lock 33.
For tumble lock 33 is limited to second orientation, the flexible combination lock of this upset also comprises one second stop gear.This second stop gear can be well known structures common in the prior art, as: at upset lock 331 and fixedly on the lock 31 pin-and-hole is set all, when tumble lock 33 turn to second orientation, utilize latch to insert pin-and-hole and tumble lock 33 is locked in second orientation; Perhaps, in tumble lock 33 fixture block is set, and at fixing lock 31 draw-in groove is set, when tumble lock 33 turn to second orientation, utilize fixture block to cooperate with draw-in groove tumble lock 33 is locked in second orientation.
Preferred embodiment, this second stop gear comprises: be connected to a clamp 313 and a dividing plate 314 between the two side 312 of pedestal, clamp 313, dividing plate 314, two side 312 and diapire 311 are encircled into a cavity volume 3133, and the distance between clamp 313 and the dividing plate 314 is greater than the upperlimit of tapered end 3321 Widths and be equal to or slightly less than the upperlimit of tapered end 3321 length directions.Consult Fig. 3 and Fig. 4, when tumble lock 33 turn to second orientation, the tapered end 3321 of tumble lock 33 can insert in the cavity volume 3133, swing handle 333 makes the two ends of tapered end 3321 length directions respectively towards clamp 313 and dividing plate 314, so just, can make tapered end 3321 two ends tighten respectively clamp 313 and dividing plate 314, realize tumble lock 33 is locked in the purpose of second orientation.
For avoiding lock 32 from fixedly dropping out the lock 31, at the pin rod 321 of lock 32 fixture block 323 is set, a position-limited trough 3231 is set on the fixture block 323; Pin-and-hole 3131 is profiled holes (consulting Fig. 3), it comprises: with the curved portions of pin rod 321 profiles coupling and the special-shaped section of mating with fixture block 323 profiles, when lock 32 inserts pin-and-hole 3131, first with the special-shaped section of the fixture block 323 part alignment pin holes 3131 of lock 32, make lock 32 front ends pass pin-and-hole 3131, when the position-limited trough 3231 on lock 32 fixture blocks 323 arrives pin-and-hole 3131, rotate lock 32 levers 322, the outer rim of pin-and-hole 3131 curved portions is engaged with position-limited trough 3231.Because pin-and-hole 3131 is arranged on the clamp 313, for guaranteeing lock 32 secure ratcses, should preferably make the thickness of clamp 313 be substantially equal to the groove width of position-limited trough 3231.
Because dividing plate 314 is arranged between clamp 313 and the positioning plate 315, stretch out pedestal on the fixing lock 31 for the head end that makes pin rod 321 can pass pin-and-hole 3131 on the clamp 313 and the fixed orifice 3151 on the positioning plate 315, a perforation 3141 that penetrates for pin rod 321 should also be set on dividing plate 314.
Consult Fig. 2 and Fig. 5, if when using tumble lock, need first lock 321 to be extracted outward, tumble lock 33 releases this moment, tumble lock 33 is overturn downwards, lock 33 to be flipped is turned to the first state (tumble lock 33 with fixedly lock 31 side by side), lock 321 is inserted pin-and-hole 3131 on the clamp 313 successively, perforation 3141 on the dividing plate 314, fixed orifice 3151 on the positioning plate 315 and the fixed orifice 3318 on the pressing board 3316, tumble lock 33 is locked at the first state, then upper freight container falls, lock core 332 is inserted in the corner fittings of freight container, handle 333 is rotated to an angle, this moment, lock core 332 synchronous rotaries were realized the locking freight container, buckled hasp 334 again, prevented that lock core 332 from rotating.
Consult Fig. 3 and Fig. 4, if when using lock 32, need first lock 32 to be extracted outward, tumble lock 33 releases this moment, with upwards upset of tumble lock 33, when lock 33 to be flipped turn to the second state (tumble lock 33 and fixedly lock 31 is overlapping), tapered end 3321 partial insertions of tumble lock 33 are by clamp 313, dividing plate 314, in the cavity volume 3133 that two side 312 and diapire 311 are encircled into, handle 333 is rotated to an angle, this moment lock core 332 synchronous rotaries, when being rotated in place, tapered end 3321 chucking clamp 313 and the dividing plates 314 of lock core 332, thus tumble lock 33 is locked at the second state.Lock 32 was in and treated lock status this moment, install on the car behind the correct position until container crane, lock 32 is pushed away inward, make lock 321 insert successively the locking hole of pin-and-hole 3131, the perforation 3141 on the dividing plate 314, the fixed orifice 3151 on the positioning plate 315, the fixed orifice 3318 on the pressing board 3316 and container angle side on the clamp 313, realize the function of locking freight container.
Consult Fig. 6, when freight container lifts on the car, be in the tumble lock 33 that is locked at the second state and can be used as simultaneously guiding mechanism, freight container is directed to suitable " loaded " position.
By above analysis, need to prove that the flexible combination lock of this upset not necessarily only is used on the front beam, also can be used on middle end carriage and the back end beam.Any framework semi-trailer beam-end adopts the flexible combination lock of this upset, all is that we implement protection domain.
Below only be better possible embodiments of the present utility model, and unrestricted protection domain of the present utility model, the equivalent structure that all utilization the utility model specification sheetss and accompanying drawing content have been done changes, and all is included in the protection domain of the present utility model.
Claims (10)
1. the flexible combination lock of the upset of a superimposed trailer is characterized in that, comprising:
Fixing lock comprises pedestal, is installed in the bearing pin on the pedestal and is opened in pin-and-hole on the pedestal;
Lock comprises pin rod and the lever that is fixed on the pin rod, and described pin rod inserts described pin-and-hole and insertion end is stretched out described pedestal;
Tumble lock, comprise: upset lock, lock core and handle, described upset lock is hinged on the described bearing pin and can rotates with respect to described bearing pin, and described lock core is installed on the described upset lock, and described handle is captiveed joint with described lock core and can be driven described lock core rotation;
Described tumble lock can turn to and described fixedly lock side by side first orientation in the horizontal direction around described bearing pin, and, with described fixedly lock in the overlapping second orientation of vertical direction.
2. the flexible combination lock of the upset of superimposed trailer as claimed in claim 1 is characterized in that the pedestal of described fixedly lock comprises: a diapire and be connected to the two side at diapire two ends, and described diapire and described two side are encircled into U-shaped; Described upset lock comprises: a top board and be vertically connected on respectively the biside plate at the two ends of top board the same side.
3. the flexible combination lock of the upset of superimposed trailer as claimed in claim 2 is characterized in that, the flexible combination lock of described upset also comprises: in order to described tumble lock is limited in the first stop gear of first orientation.
4. the flexible combination lock of the upset of superimposed trailer as claimed in claim 3, it is characterized in that, described the first stop gear comprises: be connected to the positioning plate between the two side of described pedestal and be arranged on limited step on the biside plate of described upset lock, when described tumble lock turned to first orientation, described limited step propped up described positioning plate.
5. the flexible combination lock of the upset of superimposed trailer as claimed in claim 4, it is characterized in that, described the first stop gear also comprises: be connected to the stop catch plate between the biside plate of described upset lock, be provided with fixed orifice on described positioning plate and the described stop catch plate, when described tumble lock turns to first orientation, described stop catch plate blocks described positioning plate, and the fixed orifice on the described stop catch plate is aimed at the fixed orifice on the described positioning plate.
6. the flexible combination lock of the upset of superimposed trailer as claimed in claim 2 is characterized in that, the flexible combination lock of described upset also comprises: in order to described tumble lock is limited in the second stop gear of second orientation.
7. the flexible combination lock of the upset of superimposed trailer as claimed in claim 6, it is characterized in that, described the second stop gear comprises: a clamp and a dividing plate, described clamp and described dividing plate all are connected between the two side of described pedestal, described pin-and-hole is arranged on the described clamp, be provided with the perforation of inserting for described pin rod on the described dividing plate, described lock core comprises that a tapered end and that exposes to described upset lock is inserted in the described upset lock and can be at the moving locking bar of upset lock transfer, described tapered end is elongate structure, when described tumble lock turn to second orientation, described tapered end inserts by described clamp, described dividing plate, in the cavity volume that described two side and described diapire are encircled into, rotate described tapered end and can make its two ends tighten respectively described clamp and described dividing plate.
8. the flexible combination lock of the upset of superimposed trailer as claimed in claim 1, it is characterized in that, one fixture block is set on the described pin rod, one position-limited trough is set on the described fixture block, described pin-and-hole comprises: with the curved portions of described pin rod profile coupling and the special-shaped section of mating with described fixture block profile, the outer rim of the curved portions of described position-limited trough and described pin-and-hole fastens.
9. the flexible combination lock of the upset of superimposed trailer as claimed in claim 1, it is characterized in that, described tumble lock also comprises a hasp in order to fixing described handle, one end of described hasp is hinged on the described upset lock by twisted axis, and the other end of described hasp is provided with a draw-in groove that mates with described handle.
10. superimposed trailer, comprise main car frame, described main car frame comprises the crossbeam of at least one horizontally set, it is characterized in that, also comprise at least one pair of such as the flexible combination lock of the described upset of any one among the claim 1-9, the flexible combination lock of two described upsets that arrange in pairs is arranged on the two ends of each crossbeam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220609482 CN202911617U (en) | 2012-11-16 | 2012-11-16 | Semi-trailer and overturning telescopic combined lock on the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220609482 CN202911617U (en) | 2012-11-16 | 2012-11-16 | Semi-trailer and overturning telescopic combined lock on the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202911617U true CN202911617U (en) | 2013-05-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220609482 Expired - Lifetime CN202911617U (en) | 2012-11-16 | 2012-11-16 | Semi-trailer and overturning telescopic combined lock on the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202911617U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104290637A (en) * | 2014-05-07 | 2015-01-21 | 中集集团集装箱控股有限公司 | Container lifting device used for interchangeable car body box and transport vehicle |
| CN109703631A (en) * | 2019-01-30 | 2019-05-03 | 浙江飞碟汽车制造有限公司 | A kind of logistic car container quick change construction and its application method |
| CN113276952A (en) * | 2020-02-20 | 2021-08-20 | 晟通科技集团有限公司 | Semi-trailer frame |
| RU2754700C1 (en) * | 2021-02-19 | 2021-09-06 | Общество с ограниченной ответственностью "СотекКомЦентр" | Device for fixing containers to vehicle platform (versions) |
-
2012
- 2012-11-16 CN CN 201220609482 patent/CN202911617U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104290637A (en) * | 2014-05-07 | 2015-01-21 | 中集集团集装箱控股有限公司 | Container lifting device used for interchangeable car body box and transport vehicle |
| CN104290637B (en) * | 2014-05-07 | 2017-08-29 | 中集集团集装箱控股有限公司 | Container lowering or hoisting gear and haulage vehicle for interchangeable carbody case |
| CN109703631A (en) * | 2019-01-30 | 2019-05-03 | 浙江飞碟汽车制造有限公司 | A kind of logistic car container quick change construction and its application method |
| CN113276952A (en) * | 2020-02-20 | 2021-08-20 | 晟通科技集团有限公司 | Semi-trailer frame |
| RU2754700C1 (en) * | 2021-02-19 | 2021-09-06 | Общество с ограниченной ответственностью "СотекКомЦентр" | Device for fixing containers to vehicle platform (versions) |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |