CN108974059B - Shallow platform with shock-absorbing function - Google Patents
Shallow platform with shock-absorbing function Download PDFInfo
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- CN108974059B CN108974059B CN201810604686.3A CN201810604686A CN108974059B CN 108974059 B CN108974059 B CN 108974059B CN 201810604686 A CN201810604686 A CN 201810604686A CN 108974059 B CN108974059 B CN 108974059B
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- shaft
- guide
- rotating shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/04—Castors in general; Anti-clogging castors adjustable, e.g. in height; linearly shifting castors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/04—Castors in general; Anti-clogging castors adjustable, e.g. in height; linearly shifting castors
- B60B33/045—Castors in general; Anti-clogging castors adjustable, e.g. in height; linearly shifting castors mounted resiliently, by means of dampers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B5/00—Accessories or details specially adapted for hand carts
- B62B5/0006—Bumpers; Safety devices
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Handcart (AREA)
Abstract
The invention belongs to the technical field of a trolley platform, and particularly relates to a trolley platform with a damping function, which comprises a universal wheel mechanism and a fixed platform, wherein when people use the trolley platform designed by the invention, when a rotating wheel is contacted with a protruding barrier in the front in the rotating process, the rotating wheel can generate lateral swing around the axis of a first rotating shaft; the side swing of the rotating wheel can enable the connecting block to move backwards on one hand and move towards one side of the side swing of the rotating wheel on the other hand; the wheel fixing shaft drives the rotating wheel to move by the movement of the connecting block; namely, the rotating wheel can move backwards while swinging, and can move towards one side of the side swing of the rotating wheel; the three moving parts are overlapped to bypass the raised barrier through the rotating wheel; prevent the rotating wheel from shaking when passing through the raised obstacle; the shock absorption effect is achieved through the movement of the rotating wheel; thereby reducing the design cost of the cart platform.
Description
Technical Field
The invention belongs to the technical field of a trolley platform, and particularly relates to a trolley platform with a damping function.
Background
The cart is generally used in carrying operation of people, and only the walking wheels are designed at the bottom of the cart, so that the cart is easy to shake when encountering obstacles in the pushing process; if fragile articles are placed on the cart, the articles on the cart are easily smashed by vibration when passing through an obstacle; when in transportation, workers are easy to be injured by mistake; not only harms the body, but also causes economic loss; if a damping mechanism is specially added on the cart, the design cost of the cart is increased; therefore, it is necessary to design a cart platform with damping function of the universal wheels.
The invention designs a trolley platform with a damping function to solve the problems.
Disclosure of Invention
In order to solve the defects in the prior art, the invention discloses a trolley platform with a damping function, which is realized by adopting the following technical scheme.
The utility model provides a shallow platform with shock-absorbing function which characterized in that: it includes universal wheel mechanism, fixed platform, and wherein the four corners of fixed platform downside are installed a universal wheel mechanism respectively.
The universal wheel mechanism comprises a fixing plate, a first guide block, a limiting plate, a rotating wheel, a second guide block, a connecting rod, a connecting block, a wheel fixing frame, a first rotating shaft, a fixing shaft sleeve, a first guide groove, a second guide groove, a return spring, a rotating shaft hole, a first swinging shaft, a first guide groove, a first guide block, a second swinging shaft, a first square groove, a second guide block, a third guide block and a fourth guide block, the wheel support device comprises a second guide groove, a third guide groove, a rotating shaft, a wheel fixing shaft, a volute spiral spring, a rotating shaft, a first limiting piece, a second limiting piece, a support shaft, a first bevel gear, a second bevel gear, a telescopic rotating shaft, a connecting block, a first support, a second support, a shaft hole, a support rotating shaft, a telescopic connecting plate, a third bevel gear, a telescopic shaft, a third support, a connecting support and a fourth bevel gear, wherein the lower side of one end of a fixing plate is provided with the first guide groove; two first guide grooves are symmetrically formed in the two side faces of the first guide groove; the lower side of the other end of the fixed plate is provided with two symmetrical second guide grooves; the fixed plate is arranged on the lower side of the fixed platform; a third guide groove is formed in one side face of the first guide block; two second guide grooves are symmetrically formed in two side faces of the third guide groove; two fourth guide blocks are symmetrically arranged at two ends of the first guide block; the first guide block is arranged in a first guide groove formed in the fixed plate through the matching of the two fourth guide blocks and the two first guide grooves; two third guide blocks are symmetrically arranged at two ends of the second guide block; the second guide block is arranged in a third guide groove formed in the first guide block through the matching of the two third guide blocks and the two second guide grooves; two second square grooves are symmetrically formed in the two side faces of the connecting block; a first swinging shaft is respectively arranged in the two second square grooves; the connecting block is arranged on the lower side of the second guide block; a first square groove is formed in one side face of the second guide block; a second swinging shaft is arranged in the first square groove; one end of the second guide block is provided with a first guide block; the two second guide blocks are respectively arranged on the lower side of the fixed plate through the matching of the first guide block arranged on the second guide blocks and the two second guide grooves formed on the fixed plate; a return spring is respectively arranged between the two ends of the two first guide blocks and the two side surfaces of the corresponding second guide grooves; a connecting rod is respectively arranged between the two second guide blocks and the two sides of the connecting block, which are provided with the second square grooves; two ends of the connecting rod are respectively provided with a circular hole; one ends of the two connecting rods are arranged on the connecting block through the matching of circular holes formed on the connecting rods and the two first swinging shafts arranged on the connecting block; the other ends of the two connecting rods are arranged on the two second guide blocks through the matching of circular holes formed in the connecting rods and the two second swinging shafts arranged on the two second guide blocks.
One end of the rotating shaft is arranged at the lower end of the connecting block; the fixed shaft sleeve is arranged at the other end of the rotating shaft through the outer circular surface of the fixed shaft sleeve; three second limiting pieces are uniformly arranged on the inner circular surface of the fixed shaft sleeve in the circumferential direction; the first rotating shaft is nested and arranged on the inner circular surface at one end of the fixed shaft sleeve; three groups of first limiting pieces are uniformly arranged on the outer circular surface of one end of the rotating shaft in the circumferential direction; one end of the rotating shaft, which is provided with the first limiting sheet, is arranged on the first rotating shaft and is positioned on the inner side of the fixed shaft sleeve; the three groups of first limiting pieces arranged on the rotating shaft are respectively matched with the three second limiting pieces arranged on the inner circular surface of the fixed shaft sleeve; each group of first limiting pieces in the three groups of first limiting pieces arranged on the rotating shaft are respectively symmetrical with the corresponding second limiting pieces; a volute spring is arranged between the outer circular surface at the other end of the rotating shaft and the inner circular surface of the fixed shaft sleeve which is not provided with the second limiting sheet; the inner end of the volute spiral spring is arranged on the rotating shaft, and the outer end of the volute spiral spring is arranged on the fixed shaft sleeve; the connecting square block is provided with a shaft hole; the connecting block is arranged at one end of the first rotating shaft, which is not provided with the rotating shaft.
A supporting shaft is arranged on the wheel fixing frame; the wheel fixing frame is arranged on the lower side of the connecting block through the matching of the supporting shaft and a shaft hole formed in the connecting block; the wheel fixing shaft is arranged on the wheel fixing frame; the rotating wheel is arranged on the wheel fixing shaft.
The first bevel gear is arranged at one end of the telescopic rotating shaft far away from the first rotating shaft; the first support is arranged on the side surface of the connecting block; one end of the telescopic connecting plate is arranged at the lower end of the first support; the second support is arranged at the other end of the telescopic connecting plate; one end of the telescopic rotating shaft is arranged on the first support, and the other end of the telescopic rotating shaft is arranged on the second support; the second bevel gear is arranged at one end of the telescopic rotating shaft close to the first support; the second bevel gear is meshed with the first bevel gear; the third bevel gear is arranged at one end of the telescopic rotating shaft close to the second support; the connecting support is arranged on one side of the second support; the third support is arranged at the lower side of the fixed plate; one end of the telescopic shaft is arranged on the connecting support; the other end of the telescopic shaft is arranged on a third support; the fourth bevel gear is arranged at one end of the telescopic shaft close to the connecting support; the fourth bevel gear is meshed with the third bevel gear.
The supporting shaft is arranged at the lower end of one side of the fixing plate, which is provided with the second guide groove; the limiting plate is provided with a rotating shaft hole; the two ends of the limiting plate are arc-shaped; the limiting plate is arranged on the lower side of the fixing plate through a supporting shaft; two ends of the limiting plate are respectively matched with the two second guide blocks; the supporting shaft is connected with the telescopic shaft through a flexible shaft.
As a further improvement of the technology, the return spring is a tension and compression spring.
As a further improvement of the technology, one end of the connecting rod is connected with a second swinging shaft arranged on a second guide block through a bearing; the other end of the connecting rod is connected with a first swinging shaft arranged on the connecting block through a bearing.
As a further improvement of the technology, the two ends of the limiting plate, which are arc-shaped, are provided with inclined planes, and the inclined planes are in surface contact fit with the corresponding second guide blocks in the working process.
As a further improvement of the present technology, the number of the second limiting pieces installed on the inner side of the fixed shaft sleeve is four, and the number of the first limiting pieces installed on the rotating shaft is four.
In the invention, a fixed plate is arranged at the lower side of a fixed platform; the first guide block is arranged in a first guide groove formed in the fixed plate through the matching of the two fourth guide blocks and the two first guide grooves; two third guide blocks are symmetrically arranged at two ends of the second guide block; the second guide block is arranged in a third guide groove formed in the first guide block through the matching of the two third guide blocks and the two second guide grooves; the connecting block is arranged on the lower side of the second guide block; the two second guide blocks are respectively arranged on the lower side of the fixed plate through the matching of the first guide block arranged on the second guide blocks and the two second guide grooves formed on the fixed plate; a return spring is respectively arranged between the two ends of the two first guide blocks and the two side surfaces of the corresponding second guide grooves; a connecting rod is respectively arranged between the two second guide blocks and the two sides of the connecting block, which are provided with the second square grooves; one end of the rotating shaft is arranged at the lower end of the connecting block; the fixed shaft sleeve is arranged at the other end of the rotating shaft through the outer circular surface of the fixed shaft sleeve; three second limiting pieces are uniformly arranged on the inner circular surface of the fixed shaft sleeve in the circumferential direction; the first rotating shaft is nested and arranged on the inner circular surface at one end of the fixed shaft sleeve; three groups of first limiting pieces are uniformly arranged on the outer circular surface of one end of the rotating shaft in the circumferential direction; one end of the rotating shaft, which is provided with the first limiting sheet, is arranged on the first rotating shaft; the three groups of first limiting pieces arranged on the rotating shaft are respectively matched with the three second limiting pieces arranged on the inner circular surface of the fixed shaft sleeve; a volute spring is arranged between the outer circular surface at the other end of the rotating shaft and the inner circular surface of the fixed shaft sleeve which is not provided with the second limiting sheet; the inner end of the volute spiral spring is arranged on the rotating shaft, and the outer end of the volute spiral spring is arranged on the fixed shaft sleeve; the connecting block is arranged at one end of the first rotating shaft, which is not provided with the rotating shaft; a supporting shaft is arranged on the wheel fixing frame; the wheel fixing frame is arranged on the lower side of the connecting block through the matching of the supporting shaft and a shaft hole formed in the connecting block; the wheel fixing shaft is arranged on the wheel fixing frame; the rotating wheel is arranged on the wheel fixing shaft; the first bevel gear is arranged at one end of the telescopic rotating shaft far away from the first rotating shaft; the first support is arranged on the side surface of the connecting block; one end of the telescopic connecting plate is arranged at the lower end of the first support; the second support is arranged at the other end of the telescopic connecting plate; one end of the telescopic rotating shaft is arranged on the first support, and the other end of the telescopic rotating shaft is arranged on the second support; the second bevel gear is arranged at one end of the telescopic rotating shaft close to the first support; the second bevel gear is meshed with the first bevel gear; the third bevel gear is arranged at one end of the telescopic rotating shaft close to the second support; the connecting support is arranged on one side of the second support; the third support is arranged at the lower side of the fixed plate; one end of the telescopic shaft is arranged on the connecting support; the other end of the telescopic shaft is arranged on a third support; the fourth bevel gear is arranged at one end of the telescopic shaft close to the connecting support; the fourth bevel gear is meshed with the third bevel gear; when the rotating wheel contacts with the front raised barrier in the rotating process, the rotating wheel can generate lateral swing around the axis of the first rotating shaft; the rotating wheel can drive the wheel fixing frame to generate side sway around the axis of the first rotating shaft through the wheel fixing shaft by side sway; the wheel fixing frame swings around the axis of the first rotating shaft to drive the first rotating shaft to rotate; the first rotating shaft rotates to drive the rotating shaft to rotate; the rotation of the rotating shaft drives the first bevel gear to rotate; the first bevel gear rotates to drive the second bevel gear to rotate; the second bevel gear rotates to drive the telescopic rotating shaft to rotate; the telescopic rotating shaft rotates to drive the third bevel gear to rotate; the third bevel gear rotates to drive the telescopic shaft to rotate; the telescopic shaft rotates and drives the supporting shaft to rotate through the flexible shaft; the support shaft rotates to drive the limiting plate to swing around the support shaft; one end of the limiting plate is in contact with one of the two second guide blocks, which is back to the swinging side of the rotating wheel; the limiting plate has a limiting effect on the second guide block; in this case, the protruding obstacle contacting the rotating wheel pushes the rotating wheel such that the rotating wheel moves to the rear side; the rotating wheel moves to drive the wheel fixing frame to move backwards through the wheel fixing shaft; the wheel fixing frame can drive the connecting square block to move through the supporting rotating shaft when moving; the connecting block can drive the first rotating shaft to move when moving; the first rotating shaft moves to drive the fixed shaft sleeve to move; the fixed shaft sleeve moves to drive the rotating shaft to move backwards; the rotating shaft moves backwards to drive the fixing sleeve to move backwards; the fixing sleeve moves backwards to drive the connecting block to move backwards along the third guide groove; because at this moment, one of the two second guide blocks is blocked; therefore, when the connecting block moves backwards along the third guide groove, the other second guide block which is not blocked is driven to move towards one side of the side swing of the rotating wheel through the corresponding connecting rod; the connecting block can simultaneously move towards one side of the side swing of the rotating wheel along the first guide groove in the process of moving backwards; namely, the connecting block moves backwards on one hand and moves towards one side of the side swing of the rotating wheel on the other hand; the connecting block can drive the fixing sleeve to move when moving; the fixed sleeve moves to drive the fixed shaft sleeve to move; the fixed shaft sleeve moves to drive the first rotating shaft to move; the first rotating shaft moves to drive the connecting square block to move; the connecting square block can drive the wheel fixing frame to move when moving; the wheel fixing frame moves to drive the rotating wheel to move through the wheel fixing shaft; namely, the rotating wheel can move backwards while swinging, and can move towards one side of the side swing of the rotating wheel; the three moving parts are overlapped to bypass the raised barrier through the rotating wheel; prevent the rotating wheel from shaking when passing through the raised obstacle; the first limiting sheet and the second limiting sheet have the function of preventing the rotating wheel from losing the rotating function due to overlarge side swinging angle of the rotating wheel in the process that the rotating wheel drives the first rotating shaft to swing; the function of the spiral spring is that when the rotating wheel passes through the obstacle, the rotating wheel can be restored to the original state through the spiral spring; the return spring has the function that the second guide block which moves when the rotating wheel passes through the barrier can be restored to the original position; namely, the connecting block is restored to the original position; namely, the rotating wheel is restored to the original position; the telescopic rotating shaft has the effects that the rotating force of the second bevel gear and the third bevel gear can be transmitted, and the limiting plate can be prevented from being influenced by the interference of the second bevel gear and the third bevel gear through the telescopic rotating shaft when the connecting block moves; the effect of telescopic shaft can transmit the turning force of fourth bevel gear on the one hand, and on the other hand can prevent that third bevel gear and fourth bevel gear from taking place to interfere, influencing the limiting plate when the connecting block through the telescopic shaft in the removal process.
Compared with the traditional cart platform technology, the universal wheel used by the cart platform can be adjusted according to the obstacles, so that the universal wheel can move backwards while swinging, and can also swing laterally; bypassing the protruding obstacle by the superimposed movement of the universal wheels; preventing the cart platform from shaking when passing over a raised barrier.
Drawings
Fig. 1 is a schematic view of the overall component distribution.
FIG. 2 is a schematic diagram of the universal wheel mechanism.
FIG. 3 is a schematic plan view of the arrangement of the universal wheel mechanism.
FIG. 4 is a schematic structural distribution diagram of the universal wheel mechanism.
Fig. 5 is a schematic view of the fixing plate structure.
Fig. 6 is a schematic view of the installation of the stopper plate.
Fig. 7 is a schematic diagram of a limiting plate structure.
Figure 8 is a schematic view of a connection block installation.
Fig. 9 is a schematic view of a second guide block structure.
Fig. 10 is a schematic view of a connecting block structure.
Fig. 11 is a second guide block installation schematic.
Fig. 12 is a schematic view of a first guide block structure.
Figure 13 is a schematic view of a rotating wheel installation.
Fig. 14 is a schematic view of the telescopic rotating shaft installation.
Fig. 15 is a schematic view of the connection support mounting.
FIG. 16 is a schematic view of a wrap spring installation.
FIG. 17 is a first shaft mounting schematic.
Fig. 18 is a schematic view of the first stopper piece and the second stopper piece.
Fig. 19 is a schematic view of the second stopper piece.
Fig. 20 is a schematic view of the first stopper piece.
Number designation in the figures: 1. a universal wheel mechanism; 2. a fixed platform; 3. a fixing plate; 4. a first guide block; 5. a limiting plate; 6. a rotating wheel; 7. a second guide block; 8. a connecting rod; 9. connecting blocks; 10. a wheel fixing frame; 11. a first rotating shaft; 12. fixing the shaft sleeve; 13. a first guide groove; 14. a second guide groove; 15. a return spring; 16. a rotating shaft hole; 17. a first swing shaft; 18. a first guide groove; 19. a first guide block; 20. a second swing shaft; 21. a first square groove; 22. a second square groove; 23. a second guide block; 24. a third guide block; 25. a fourth guide block; 26. a second guide groove; 27. a third guide groove; 29. a rotating shaft; 30. a wheel securing axle; 31. a volute spiral spring; 32. a rotating shaft; 33. a first limiting sheet; 34. a second limiting sheet; 35. a first bevel gear; 36. a second bevel gear; 37. a telescopic rotating shaft; 38. connecting the squares; 39. a first support; 40. a second support; 41. a shaft hole; 42. a support shaft; 43. a support shaft; 44. a telescopic connecting plate; 45. a third bevel gear; 46. a telescopic shaft; 47. a third support; 48. connecting and supporting; 49. and a fourth bevel gear.
Detailed Description
As shown in fig. 1, it comprises a universal wheel mechanism 1 and a fixed platform 2, wherein, one universal wheel mechanism 1 is respectively arranged at four corners of the lower side of the fixed platform 2.
As shown in fig. 2, 3, 4, 8, and 13, the universal wheel mechanism 1 includes a fixed plate 3, a first guide block 4, a limit plate 5, a rotating wheel 6, a second guide block 23, a connecting rod 8, a connecting block 9, a wheel holder 10, a first rotating shaft 11, a fixed sleeve 12, a first guide groove 13, a second guide groove 14, a return spring 15, a rotating shaft hole 16, a first swinging shaft 17, a first guide groove 18, a first guide block 19, a second swinging shaft 20, a first square groove 21, a second square groove 22, a second guide block 7, a third guide block 24, a fourth guide block 25, a second guide groove 26, a third guide groove 27, a rotating shaft 29, a wheel fixing shaft 30, a spiral spring 31, a rotating shaft 32, a first limit piece 33, a second limit piece 34, a supporting shaft 43, a first bevel gear 35, a second bevel gear 36, a telescopic rotating shaft 37, a connecting block 9, a first support 39, a second support 40, a second guide groove 14, a second guide groove, a second guide spring, a second guide plate 19, a second guide plate, a third guide plate, a second guide plate, a third guide plate, a second guide plate, a third guide plate, a second guide plate, a third guide plate, a second guide plate, a third guide plate, the device comprises a shaft hole 41, a support rotating shaft 42, a telescopic connecting plate 44, a third bevel gear 45, a telescopic shaft 46, a third support 47, a connecting support 48 and a fourth bevel gear 49, wherein as shown in fig. 5, the lower side of one end of a fixing plate 3 is provided with a first guide groove 18; two first guide grooves 13 are symmetrically formed on two side surfaces of the first guide groove 18; the lower side of the other end of the fixed plate 3 is provided with two symmetrical second guide grooves 14; as shown in fig. 1 and 5, the fixed plate 3 is mounted on the lower side of the fixed platform 2; as shown in fig. 12, a third guide groove 27 is formed on one side surface of the first guide block 4; two second guide grooves 26 are symmetrically formed on two side surfaces of the third guide groove 27; two fourth guide blocks 25 are symmetrically arranged at two ends of the first guide block 4; as shown in fig. 5, 8 and 12, the first guide block 4 is mounted in the first guide groove 18 formed on the fixed plate 3 by the cooperation of the two fourth guide blocks 25 and the two first guide grooves 13; as shown in fig. 11, two third guide blocks 24 are symmetrically installed at both ends of the second guide block 23; as shown in fig. 8, the second guide block 23 is mounted in a third guide groove 27 formed in the first guide block 4 by the cooperation of two third guide blocks 24 and two second guide grooves 26; as shown in fig. 10, two second square grooves 22 are symmetrically formed on both side surfaces of the connecting block 9; as shown in fig. 11, a first swing shaft 17 is installed in each of the two second square grooves 22; the connecting block 9 is installed at the lower side of the second guide block 23; as shown in fig. 9, a first square groove 21 is formed on one side surface of the second guide block 7; a second swing shaft 20 is installed in the first square groove 21; a first guide block 19 is arranged at one end of the second guide block 7; as shown in fig. 8 and 9, the two second guide blocks 7 are respectively mounted on the lower side of the fixing plate 3 by the cooperation of the first guide blocks 19 mounted thereon and the two second guide grooves 14 opened on the fixing plate 3; as shown in fig. 9, a return spring 15 is respectively installed between both ends of the two first guide blocks 19 and both side surfaces of the corresponding second guide groove 14; as shown in fig. 8 and 11, a connecting rod 8 is respectively installed between the two second guide blocks 7 and the two sides of the connecting block 9, which are provided with the second square grooves 22; two ends of the connecting rod 8 are respectively provided with a circular hole; one ends of the two connecting rods 8 are arranged on the connecting block 9 through the matching of circular holes formed on the connecting rods and two first swinging shafts 17 arranged on the connecting block 9; the other ends of the two connecting rods 8 are mounted on the two second guide blocks 7 through the matching of circular holes formed in the connecting rods and the two second swinging shafts 20 mounted on the two second guide blocks 7.
As shown in fig. 8 and 13, one end of the rotating shaft 29 is mounted on the lower end of the connecting block 9; as shown in fig. 14, the fixed boss 12 is mounted on the other end of the rotation shaft 29 by its outer circumferential surface; as shown in fig. 18, three second limiting pieces 34 are uniformly arranged on the inner circumferential surface of the fixed shaft sleeve 12 in the circumferential direction; as shown in fig. 17, the first rotating shaft 11 is nested and mounted on the inner circumferential surface of one end of the fixed sleeve 12; as shown in fig. 19, three sets of first position-limiting pieces 33 are uniformly installed on the outer circumferential surface of one end of the rotating shaft 32 in the circumferential direction; one end of the rotating shaft 32, which is provided with the first limiting piece 33, is arranged on the first rotating shaft 11, as shown in fig. 20, and is located on the inner side of the fixed shaft sleeve 12; three sets of first limiting pieces 33 arranged on the rotating shaft 32 are respectively matched with three second limiting pieces 34 arranged on the inner circular surface of the fixed shaft sleeve 12; each group of first limiting pieces 33 in the three groups of first limiting pieces 33 arranged on the rotating shaft 32 is respectively symmetrical with the corresponding second limiting piece 34; as shown in fig. 16, a spiral spring 31 is installed between the outer circumferential surface of the other end of the rotating shaft 32 and the inner circumferential surface of the fixed shaft sleeve 12 without the second limiting piece 34; as shown in fig. 17, an inner end of spiral spring 31 is mounted on rotating shaft 32, and an outer end of spiral spring 31 is mounted on fixed sleeve 12; as shown in fig. 14, the connection block 38 has a shaft hole 41; the connection block 38 is installed at an end of the first rotation shaft 11 where the rotation shaft 32 is not installed.
As shown in fig. 15, the wheel holder 10 is provided with a support shaft 43; as shown in fig. 14, 15 and 16, the wheel holder 10 is mounted on the lower side of the connecting block 9 through the cooperation of the supporting shaft 43 and the shaft hole 41 formed on the connecting block 38; the wheel fixing shaft 30 is mounted on the wheel fixing frame 10; the rotatable wheel 6 is mounted on the wheel securing axle 30.
As shown in fig. 13 and 14, a first bevel gear 35 is mounted on the telescopic rotating shaft 37 at one end far from the first rotating shaft 11; the first support 39 is arranged on the side surface of the connecting block; one end of the expansion joint plate 44 is mounted on the lower end of the first support 39; the second support 40 is mounted at the other end of the telescopic connection plate 44; one end of the telescopic rotating shaft 37 is mounted on the first support 39, and the other end of the telescopic rotating shaft 37 is mounted on the second support 40; the second bevel gear 36 is arranged at one end of the telescopic rotating shaft 37 close to the first support 39; the second bevel gear 36 is meshed with the first bevel gear 35; a third bevel gear 45 is arranged at one end of the telescopic rotating shaft 37 close to the second support 40; the connection support 48 is installed at one side of the second support 40; the third support 47 is mounted on the lower side of the fixed plate 3; one end of the telescopic shaft 46 is mounted on the connecting support 48; the other end of the telescopic shaft 46 is mounted on a third support 47; a fourth bevel gear 49 is mounted at one end of the telescopic shaft 46 close to the connecting support 48; a fourth bevel gear 49 meshes with the third bevel gear 45.
As shown in fig. 6, the supporting shaft 43 is installed at the lower end of the fixing plate 3 on the side where the second guide groove 14 is opened; as shown in fig. 7, the limiting plate 5 has a rotating shaft hole 16; the two ends of the limiting plate 5 are arc-shaped; as shown in fig. 6, the limit plate 5 is mounted on the lower side of the fixed plate 3 by a support shaft 43; the two ends of the limiting plate 5 are respectively matched with the two second guide blocks 23; the support shaft 43 is connected with the telescopic shaft 46 through a flexible shaft.
The return spring 15 is a tension/compression spring.
One end of the connecting rod 8 is connected with a second swinging shaft 20 arranged on the second guide block 7 through a bearing; the other end of the connecting rod 8 is connected to a first swing shaft 17 mounted on the connecting block 9 through a bearing.
The two ends of the limiting plate 5, which are arc-shaped, are provided with inclined planes, and the inclined planes are in surface contact fit with the corresponding second guide blocks 23 in the working process.
The number of the second position-limiting pieces 34 installed inside the fixed shaft sleeve 12 is four, and the number of the first position-limiting pieces 33 installed on the rotating shaft 32 is four.
In summary, the following steps:
the universal wheel used by the cart platform can be adjusted according to the obstacles, so that the universal wheel can move backwards while swinging and can swing laterally; bypassing the protruding obstacle by the superimposed movement of the universal wheels; preventing the cart platform from shaking when passing over a raised barrier.
In the invention, a fixed plate 3 is arranged at the lower side of a fixed platform 2; the first guide block 4 is arranged in the first guide groove 18 formed on the fixed plate 3 through the matching of the two fourth guide blocks 25 and the two first guide grooves 13; two third guide blocks 24 are symmetrically arranged at two ends of the second guide block 23; the second guide block 23 is arranged in a third guide groove 27 formed in the first guide block 4 through the matching of the two third guide blocks 24 and the two second guide grooves 26; the connecting block 9 is installed at the lower side of the second guide block 23; the two second guide blocks 7 are respectively arranged at the lower side of the fixed plate 3 through the matching of the first guide blocks 19 arranged on the two second guide blocks and the two second guide grooves 14 formed on the fixed plate 3; a return spring 15 is respectively arranged between two ends of the two first guide blocks 19 and two side surfaces of the corresponding second guide groove 14; a connecting rod 8 is respectively arranged between the two second guide blocks 7 and the two sides of the connecting block 9, which are provided with the second square grooves 22; one end of the rotating shaft 29 is installed at the lower end of the connecting block 9; the fixed shaft sleeve 12 is installed at the other end of the rotating shaft 29 through the outer circumferential surface thereof; three second limiting pieces 34 are uniformly arranged on the inner circular surface of the fixed shaft sleeve 12 in the circumferential direction; the first rotating shaft 11 is nested and arranged on the inner circular surface at one end of the fixed shaft sleeve 12; three groups of first limiting pieces 33 are uniformly arranged on the outer circular surface of one end of the rotating shaft 32 in the circumferential direction; one end of the rotating shaft 32, which is provided with the first limiting sheet 33, is arranged on the first rotating shaft 11; three sets of first limiting pieces 33 arranged on the rotating shaft 32 are respectively matched with three second limiting pieces 34 arranged on the inner circular surface of the fixed shaft sleeve 12; a volute spring 31 is arranged between the outer circular surface of the other end of the rotating shaft 32 and the inner circular surface of the fixed shaft sleeve 12 without the second limiting sheet 34; the inner end of scroll spring 31 is mounted on rotating shaft 32, and the outer end of scroll spring 31 is mounted on fixed shaft sleeve 12; the connecting block 38 is installed at one end of the first rotating shaft 11 where the rotating shaft 32 is not installed; the wheel fixing frame 10 is provided with a supporting shaft 43; the wheel fixing frame 10 is arranged at the lower side of the connecting block 9 through the matching of a supporting shaft 43 and a shaft hole 41 formed on the connecting block 38; the wheel fixing shaft 30 is mounted on the wheel fixing frame 10; the rotating wheel 6 is arranged on the wheel fixing shaft 30; the first bevel gear 35 is arranged at one end of the telescopic rotating shaft 37 far away from the first rotating shaft 11; the first support 39 is arranged on the side surface of the connecting block; one end of the expansion joint plate 44 is mounted on the lower end of the first support 39; the second support 40 is mounted at the other end of the telescopic connection plate 44; one end of the telescopic rotating shaft 37 is mounted on the first support 39, and the other end of the telescopic rotating shaft 37 is mounted on the second support 40; the second bevel gear 36 is arranged at one end of the telescopic rotating shaft 37 close to the first support 39; the second bevel gear 36 is meshed with the first bevel gear 35; a third bevel gear 45 is arranged at one end of the telescopic rotating shaft 37 close to the second support 40; the connection support 48 is installed at one side of the second support 40; the third support 47 is mounted on the lower side of the fixed plate 3; one end of the telescopic shaft 46 is mounted on the connecting support 48; the other end of the telescopic shaft 46 is mounted on a third support 47; a fourth bevel gear 49 is mounted at one end of the telescopic shaft 46 close to the connecting support 48; the fourth bevel gear 49 is meshed with the third bevel gear 45; when the rotating wheel 6 contacts with the front protruding obstacle in the rotating process, the rotating wheel 6 can generate side swing around the axis of the first rotating shaft 11; the rotating wheel 6 can swing laterally to drive the wheel fixing frame 10 to swing laterally around the axis of the first rotating shaft 11 through the wheel fixing shaft 30; the wheel fixing frame 10 swings around the axis of the first rotating shaft 11 to drive the first rotating shaft 11 to rotate; the rotation of the first rotating shaft 11 will drive the rotating shaft 32 to rotate; the rotation of the rotating shaft 32 drives the first bevel gear 35 to rotate; the rotation of the first bevel gear 35 drives the rotation of the second bevel gear 36; the second bevel gear 36 rotates to drive the telescopic rotating shaft 37 to rotate; the telescopic rotating shaft 37 rotates to drive the third bevel gear 45 to rotate; the third bevel gear 45 rotates to drive the telescopic shaft 46 to rotate; the telescopic shaft 46 rotates to drive the support shaft 43 to rotate through the flexible shaft; the supporting shaft 43 rotates to drive the limiting plate 5 to swing around the supporting shaft 43; one end of the limiting plate 5 is in contact with one second guide block 7 of the two second guide blocks 7, which faces away from the swinging side of the rotating wheel 6; the limiting plate 5 can limit the second guide block 7; in this case, the protruding obstacle coming into contact with the rotary wheel 6 pushes the rotary wheel 6 so that the rotary wheel 6 moves to the rear side; the rotating wheel 6 moves to drive the wheel fixing frame 10 to move backwards through the wheel fixing shaft 30; the wheel fixing frame 10 moves to drive the connecting block 38 to move through the supporting rotating shaft 42; the movement of the connection block 38 will drive the first rotation shaft 11 to move; the first rotating shaft 11 moves to drive the fixed shaft sleeve 12 to move; the fixed shaft sleeve 12 moves to drive the rotating shaft 29 to move backwards; the backward movement of the rotating shaft 29 drives the fixing sleeve to move backward; the backward movement of the fixing sleeve drives the connecting block 9 to move backward along the third guide groove 27; because at this moment, one of the two second guide blocks 7 is blocked; the backward movement of the connecting block 9 along the third guide groove 27 will bring the other second guide block 7 which is not locked to move along the corresponding second guide groove 14 toward the side of the side swing of the rotating wheel 6 through the corresponding connecting rod 8; and the connecting block 9 moves along the first guide groove 18 toward the side of the rolling wheel 6 side simultaneously during the backward movement; namely, the connecting block 9 moves backwards on the one hand and moves towards one side of the side swing of the rotating wheel 6 on the other hand; the connecting block 9 moves to drive the fixing sleeve to move; the fixed sleeve moves to drive the fixed shaft sleeve 12 to move; the fixed shaft sleeve 12 moves to drive the first rotating shaft 11 to move; the first rotating shaft 11 moves to drive the connecting block 38 to move; the movement of the connecting block 38 drives the wheel fixing frame 10 to move; the wheel fixing frame 10 moves to drive the rotating wheel 6 to move through the wheel fixing shaft 30; namely, the rotating wheel 6 moves backwards while swinging, and moves towards one side of the rotating wheel 6 during side swinging; the three moving parts pass by the protruding barrier through the rotating wheel 6; preventing the rotating wheel 6 from shaking when passing through a protruding obstacle; the first limiting sheet 33 and the second limiting sheet 34 are used for preventing the rotating wheel 6 from losing the rotating function due to overlarge side swinging angle of the rotating wheel 6 in the process that the rotating wheel 6 drives the first rotating shaft 11 to swing; the scroll spring 31 functions to restore the rotary wheel 6 to an original state by the scroll spring 31 when the rotary wheel 6 passes an obstacle; the return spring 15 functions to restore the second guide block 7, which moves when the rotating wheel 6 passes through an obstacle, to its original position; namely, the connecting block 9 is restored to the original position; namely, the rotating wheel 6 is restored to the original position; the telescopic rotating shaft 37 is used for transmitting the rotating force of the second bevel gear 36 and the third bevel gear 45 on one hand, and on the other hand, when the connecting block 9 moves, the interference between the second bevel gear 36 and the third bevel gear 45 can be prevented through the telescopic rotating shaft 37, so that the limiting plate 5 is influenced; the telescopic shaft 46 is used for transmitting the rotating force of the fourth bevel gear 49 on one hand, and on the other hand, when the connecting block 9 moves, the interference between the third bevel gear 45 and the fourth bevel gear 49 can be prevented through the telescopic shaft 46, and the limiting plate 5 is prevented from being influenced.
The specific implementation mode is as follows: when people use the cart platform designed by the invention, when the rotating wheel 6 is contacted with a protruding obstacle in the front in the rotating process, the rotating wheel 6 can generate lateral swing around the axis of the first rotating shaft 11; the rotating wheel 6 can swing laterally to drive the wheel fixing frame 10 to swing laterally around the axis of the first rotating shaft 11 through the wheel fixing shaft 30; the wheel fixing frame 10 swings around the axis of the first rotating shaft 11 to drive the first rotating shaft 11 to rotate; the rotation of the first rotating shaft 11 will drive the rotating shaft 32 to rotate; the rotation of the rotating shaft 32 drives the first bevel gear 35 to rotate; the rotation of the first bevel gear 35 drives the rotation of the second bevel gear 36; the second bevel gear 36 rotates to drive the telescopic rotating shaft 37 to rotate; the telescopic rotating shaft 37 rotates to drive the third bevel gear 45 to rotate; the third bevel gear 45 rotates to drive the telescopic shaft 46 to rotate; the telescopic shaft 46 rotates to drive the support shaft 43 to rotate through the flexible shaft; the supporting shaft 43 rotates to drive the limiting plate 5 to swing around the supporting shaft 43; one end of the limiting plate 5 is in contact with one second guide block 7 of the two second guide blocks 7, which faces away from the swinging side of the rotating wheel 6; the limiting plate 5 can limit the second guide block 7; in this case, the protruding obstacle coming into contact with the rotary wheel 6 pushes the rotary wheel 6 so that the rotary wheel 6 moves to the rear side; the rotating wheel 6 moves to drive the wheel fixing frame 10 to move backwards through the wheel fixing shaft 30; the wheel fixing frame 10 moves to drive the connecting block 38 to move through the supporting rotating shaft 42; the movement of the connection block 38 will drive the first rotation shaft 11 to move; the first rotating shaft 11 moves to drive the fixed shaft sleeve 12 to move; the fixed shaft sleeve 12 moves to drive the rotating shaft 29 to move backwards; the backward movement of the rotating shaft 29 drives the fixing sleeve to move backward; the backward movement of the fixing sleeve drives the connecting block 9 to move backward along the third guide groove 27; because at this moment, one of the two second guide blocks 7 is blocked; the backward movement of the connecting block 9 along the third guide groove 27 will bring the other second guide block 7 which is not locked to move along the corresponding second guide groove 14 toward the side of the side swing of the rotating wheel 6 through the corresponding connecting rod 8; and the connecting block 9 moves along the first guide groove 18 toward the side of the rolling wheel 6 side simultaneously during the backward movement; namely, the connecting block 9 moves backwards on the one hand and moves towards one side of the side swing of the rotating wheel 6 on the other hand; the connecting block 9 moves to drive the fixing sleeve to move; the fixed sleeve moves to drive the fixed shaft sleeve 12 to move; the fixed shaft sleeve 12 moves to drive the first rotating shaft 11 to move; the first rotating shaft 11 moves to drive the connecting block 38 to move; the movement of the connecting block 38 drives the wheel fixing frame 10 to move; the wheel fixing frame 10 moves to drive the rotating wheel 6 to move through the wheel fixing shaft 30; namely, the rotating wheel 6 moves backwards while swinging, and moves towards one side of the rotating wheel 6 during side swinging; the three moving parts pass by the protruding barrier through the rotating wheel 6; the rolling wheel 6 is prevented from being shaken when passing a protruding obstacle.
Claims (5)
1. The utility model provides a shallow platform with shock-absorbing function which characterized in that: the universal wheel mechanism comprises a universal wheel mechanism and a fixed platform, wherein the universal wheel mechanism is respectively arranged at four corners of the lower side of the fixed platform;
the universal wheel mechanism comprises a fixing plate, a first guide block, a limiting plate, a rotating wheel, a second guide block, a connecting rod, a connecting block, a wheel fixing frame, a first rotating shaft, a fixing shaft sleeve, a first guide groove, a second guide groove, a return spring, a rotating shaft hole, a first swinging shaft, a first guide groove, a first guide block, a second swinging shaft, a first square groove, a second guide block, a third guide block and a fourth guide block, the wheel support device comprises a second guide groove, a third guide groove, a rotating shaft, a wheel fixing shaft, a volute spiral spring, a rotating shaft, a first limiting piece, a second limiting piece, a support shaft, a first bevel gear, a second bevel gear, a telescopic rotating shaft, a connecting block, a first support, a second support, a shaft hole, a support rotating shaft, a telescopic connecting plate, a third bevel gear, a telescopic shaft, a third support, a connecting support and a fourth bevel gear, wherein the lower side of one end of a fixing plate is provided with the first guide groove; two first guide grooves are symmetrically formed in the two side faces of the first guide groove; the lower side of the other end of the fixed plate is provided with two symmetrical second guide grooves; the fixed plate is arranged on the lower side of the fixed platform; a third guide groove is formed in one side face of the first guide block; two second guide grooves are symmetrically formed in two side faces of the third guide groove; two fourth guide blocks are symmetrically arranged at two ends of the first guide block; the first guide block is arranged in a first guide groove formed in the fixed plate through the matching of the two fourth guide blocks and the two first guide grooves; two third guide blocks are symmetrically arranged at two ends of the second guide block; the second guide block is arranged in a third guide groove formed in the first guide block through the matching of the two third guide blocks and the two second guide grooves; two second square grooves are symmetrically formed in the two side faces of the connecting block; a first swinging shaft is respectively arranged in the two second square grooves; the connecting block is arranged on the lower side of the second guide block; a first square groove is formed in one side face of the second guide block; a second swinging shaft is arranged in the first square groove; one end of the second guide block is provided with a first guide block; the two second guide blocks are respectively arranged on the lower side of the fixed plate through the matching of the first guide block arranged on the second guide blocks and the two second guide grooves formed on the fixed plate; a return spring is respectively arranged between the two ends of the two first guide blocks and the two side surfaces of the corresponding second guide grooves; a connecting rod is respectively arranged between the two second guide blocks and the two sides of the connecting block, which are provided with the second square grooves; two ends of the connecting rod are respectively provided with a circular hole; one ends of the two connecting rods are arranged on the connecting block through the matching of circular holes formed on the connecting rods and the two first swinging shafts arranged on the connecting block; the other ends of the two connecting rods are arranged on the two second guide blocks through the matching of circular holes formed in the connecting rods and the two second swinging shafts arranged on the two second guide blocks;
one end of the rotating shaft is arranged at the lower end of the connecting block; the fixed shaft sleeve is arranged at the other end of the rotating shaft through the outer circular surface of the fixed shaft sleeve; three second limiting pieces are uniformly arranged on the inner circular surface of the fixed shaft sleeve in the circumferential direction; the first rotating shaft is nested and arranged on the inner circular surface at one end of the fixed shaft sleeve; three groups of first limiting pieces are uniformly arranged on the outer circular surface of one end of the rotating shaft in the circumferential direction; one end of the rotating shaft, which is provided with the first limiting sheet, is arranged on the first rotating shaft and is positioned on the inner side of the fixed shaft sleeve; the three groups of first limiting pieces arranged on the rotating shaft are respectively matched with the three second limiting pieces arranged on the inner circular surface of the fixed shaft sleeve; each group of first limiting pieces in the three groups of first limiting pieces arranged on the rotating shaft are respectively symmetrical with the corresponding second limiting pieces; a volute spring is arranged between the outer circular surface at the other end of the rotating shaft and the inner circular surface of the fixed shaft sleeve which is not provided with the second limiting sheet; the inner end of the volute spiral spring is arranged on the rotating shaft, and the outer end of the volute spiral spring is arranged on the fixed shaft sleeve; the connecting square block is provided with a shaft hole; the connecting block is arranged at one end of the first rotating shaft, which is not provided with the rotating shaft;
a supporting shaft is arranged on the wheel fixing frame; the wheel fixing frame is arranged on the lower side of the connecting block through the matching of the supporting shaft and a shaft hole formed in the connecting block; the wheel fixing shaft is arranged on the wheel fixing frame; the rotating wheel is arranged on the wheel fixing shaft;
the first bevel gear is arranged at one end of the telescopic rotating shaft far away from the first rotating shaft; the first support is arranged on the side surface of the connecting block; one end of the telescopic connecting plate is arranged at the lower end of the first support; the second support is arranged at the other end of the telescopic connecting plate; one end of the telescopic rotating shaft is arranged on the first support, and the other end of the telescopic rotating shaft is arranged on the second support; the second bevel gear is arranged at one end of the telescopic rotating shaft close to the first support; the second bevel gear is meshed with the first bevel gear; the third bevel gear is arranged at one end of the telescopic rotating shaft close to the second support; the connecting support is arranged on one side of the second support; the third support is arranged at the lower side of the fixed plate; one end of the telescopic shaft is arranged on the connecting support; the other end of the telescopic shaft is arranged on a third support; the fourth bevel gear is arranged at one end of the telescopic shaft close to the connecting support; the fourth bevel gear is meshed with the third bevel gear;
the supporting shaft is arranged at the lower end of one side of the fixing plate, which is provided with the second guide groove; the limiting plate is provided with a rotating shaft hole; the two ends of the limiting plate are arc-shaped; the limiting plate is arranged on the lower side of the fixing plate through a supporting shaft; two ends of the limiting plate are respectively matched with the two second guide blocks; the supporting shaft is connected with the telescopic shaft through a flexible shaft.
2. The cart platform with shock absorbing function of claim 1, wherein: the return spring is a tension spring.
3. The cart platform with shock absorbing function of claim 1, wherein: one end of the connecting rod is connected with a second swinging shaft arranged on a second guide block through a bearing; the other end of the connecting rod is connected with a first swinging shaft arranged on the connecting block through a bearing.
4. The cart platform with shock absorbing function of claim 1, wherein: the two ends of the limiting plate, which are arc-shaped, are provided with inclined planes, and the inclined planes are in surface contact fit with the corresponding second guide blocks in the working process.
5. The cart platform with shock absorbing function of claim 1, wherein: the number of the second limiting sheets arranged on the inner side of the fixed shaft sleeve is four, and the number of the first limiting sheets arranged on the rotating shaft is four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810604686.3A CN108974059B (en) | 2018-06-13 | 2018-06-13 | Shallow platform with shock-absorbing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810604686.3A CN108974059B (en) | 2018-06-13 | 2018-06-13 | Shallow platform with shock-absorbing function |
Publications (2)
| Publication Number | Publication Date |
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| CN108974059A CN108974059A (en) | 2018-12-11 |
| CN108974059B true CN108974059B (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810604686.3A Active CN108974059B (en) | 2018-06-13 | 2018-06-13 | Shallow platform with shock-absorbing function |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111485517B (en) * | 2020-04-16 | 2021-09-21 | 南京六合高新建设发展有限公司 | A automatic descaling machine for building site |
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| US6409196B1 (en) * | 1999-11-22 | 2002-06-25 | Mcfarland Ryan J. | Wheelchair front fork |
| CN203888541U (en) * | 2014-06-26 | 2014-10-22 | 刘瑞军 | Idler wheel device used on image equipment bracket |
| US9393981B1 (en) * | 2015-02-17 | 2016-07-19 | Ftr Systems, Inc | Foldable cart with rear guidance arrangement |
| CN106347430A (en) * | 2015-07-15 | 2017-01-25 | 五冶集团上海有限公司 | Obstacle-crossing platform trolley based on manual operation |
| CN206141225U (en) * | 2016-10-30 | 2017-05-03 | 山东飞天塑胶制品有限公司 | Medical universal regulating wheel |
| CN206841079U (en) * | 2017-03-27 | 2018-01-05 | 常熟通润汽车零部件股份有限公司 | Shock-absorbing trailing wheel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4773123A (en) * | 1987-02-02 | 1988-09-27 | Tatie Industrial Co., Ltd. | Automatically extensible and retractable wheel unit for mounting on a corner of a suitcase |
| US6409196B1 (en) * | 1999-11-22 | 2002-06-25 | Mcfarland Ryan J. | Wheelchair front fork |
| CN203888541U (en) * | 2014-06-26 | 2014-10-22 | 刘瑞军 | Idler wheel device used on image equipment bracket |
| US9393981B1 (en) * | 2015-02-17 | 2016-07-19 | Ftr Systems, Inc | Foldable cart with rear guidance arrangement |
| CN106347430A (en) * | 2015-07-15 | 2017-01-25 | 五冶集团上海有限公司 | Obstacle-crossing platform trolley based on manual operation |
| CN206141225U (en) * | 2016-10-30 | 2017-05-03 | 山东飞天塑胶制品有限公司 | Medical universal regulating wheel |
| CN206841079U (en) * | 2017-03-27 | 2018-01-05 | 常熟通润汽车零部件股份有限公司 | Shock-absorbing trailing wheel |
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| CN108974059A (en) | 2018-12-11 |
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