Central control wheel

Abstract

The center control wheel comprises a mounting seat, a support and a wheel, the wheel is rotationally connected with the mounting seat through the support, a guide rod is arranged on the support, a rotating plate is rotationally connected to the mounting seat, and the two ends of a connecting plate are hinged to the guide rod and the rotating plate through a first pin shaft and a second pin shaft correspondingly; the rotating plate drives the support to rotate around the mounting base through the connecting plate and the guide rod, the connecting line of the circle center of the rotating shaft of the rotating plate and the circle center of the first pin shaft serves as a reference line, and after the wheel is put down, the second pin shaft is located below the reference line. By arranging the rotating plate, the connecting plate and the guide rod, wheel lowering and self-locking can be achieved without extending the support, and compared with an existing center control wheel, the overall strength is improved, and the safety and stability in the running process are improved.

Description

Technical Field

[0001] The present invention relates to a means of transportation, and in particular to a center control wheel. Background Art

[0002] When transferring hospital beds and precision instruments, different working conditions will be encountered. To ensure the transfer efficiency and at the same time ensure the safety of the staff or the stability of the transported object, auxiliary devices are often required, and the center control wheel is a common auxiliary device. As an auxiliary device, for different working conditions, there is a need for recovery or lowering. However, the existing center control wheel structures generally occupy a large space, have a complex structure, and are laborious to assemble.

[0003] The utility model patent application with the publication number CN 209236634 U discloses an auxiliary wheel device for an electric wheelchair. By setting a locking groove and a locking and unlocking mechanism, the lifting and lowering of the auxiliary wheel are realized. In the current solution, the auxiliary wheel bracket needs to be extended to provide installation space for the locking and unlocking mechanism, which reduces the strength of the bracket, increases the locking and unlocking mechanism to make the overall device more complex, and the locking and unlocking mechanism and the lifting of the auxiliary wheel need to be operated simultaneously during the lifting process of the auxiliary wheel, which is inconvenient to operate. Summary of the Invention

[0004] Object of the Invention: The object of the present invention is to provide a center control wheel with improved strength and self-locking during lowering.

[0005] Technical Solution: A center control wheel of the present invention includes a mounting seat, a bracket, and a wheel. The wheel is rotatably connected to the mounting seat through the bracket. A guide rod is provided on the bracket. A rotating plate is rotatably connected to the mounting seat. Two ends of a connecting plate are respectively hinged to the guide rod and the rotating plate through a first pin shaft and a second pin shaft. The rotating plate drives the bracket to rotate around the mounting seat through the connecting plate and the guide rod. Taking the connecting line of the center of the rotating shaft of the rotating plate and the center of the first pin shaft as a reference line, after the wheel is lowered, the second pin shaft is located below the reference line.

[0006] Preferably, a first limiting spacer is provided on the mounting seat. The first limiting spacer is located in the space enclosed by the rotating plate, the connecting plate, and the guide rod. Two ends of the first limiting spacer are connected to both sides of the mounting seat. After the wheel is lowered, the rotating plate abuts against the first limiting spacer.

[0007] Preferably, after the wheel is lowered, taking the rotating shaft or the first pin shaft as the vertex, the included angle range formed among the first limiting spacer, the rotating shaft, and the first pin shaft is 32° - 38°.

[0008] Preferably, after the wheel is lowered, taking the rotating shaft or the first pin shaft as the vertex, the included angle range formed among the second pin shaft, the rotating shaft, and the first pin shaft is 2° - 7°.

[0009] Preferably, inclined slots are provided on both sides of the mounting base, and both ends of the first pin shaft are slidably connected to the inclined slots. When the wheel is lifted or lowered, the first pin shaft is respectively located at both ends of the inclined slots.

[0010] Preferably, the connecting plate is a U-shaped plate, and the two bent sides of the connecting plate are clamped on both sides of the guide rod and the rotating plate.

[0011] Preferably, a limiting block is provided at one end of the bracket away from the wheel. After the wheel is lifted, the free end of the rotating plate abuts against the limiting block.

[0012] Preferably, a roller is provided at the free end of the rotating plate, and the free end of the rotating plate abuts against the limiting block through the roller.

[0013] Preferably, a long hole is provided at the end of the guide rod, a spring is sleeved outside, and the guide rod is connected to the bracket through the long hole, the third pin shaft.

[0014] Preferably, a second limiting spacer sleeve is provided on the mounting base, and both ends of the second limiting spacer sleeve are connected to both sides of the mounting base. After the wheel is lifted, the rotating plate abuts against the second limiting spacer sleeve.

[0015] Preferably, a handle seat for the handle to be inserted is connected to the rotating shaft.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: 1. Improve strength and the lowering can be self-locked: By setting the rotating plate, the connecting plate, and the guide rod, the lowering and self-locking of the wheel can be realized without extending the bracket. Compared with the existing central control wheel, the overall strength is improved, and the safety and stability during operation are enhanced; 2. The structure is simple and compact: The first limiting spacer sleeve, the second limiting spacer sleeve, and the connecting plate are all located inside the mounting base, which not only serves as a limiting member but also as a supporting member, greatly simplifying the structure, making the structure more compact and more stable; 3. Convenient for disassembly and improve production efficiency: The overall structure can be assembled only through screws and spacer sleeves, which can improve the processing and assembly efficiency and meet the general requirements of medical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the central control wheel of the present invention;

[0018] Figure 2 is the exploded view of the structure of the central control wheel of the present invention;

[0019] Figure 3 is the internal structural schematic diagram of the central control wheel of the present invention;

[0020] Figure 4 is the internal structural schematic diagram of the central control wheel in the lifted state;

[0021] Figure 5 is the internal structural schematic diagram of the central control wheel in the lowered state;

[0022] Figure 6 Side view of the internal structure of the central control wheel of the present invention;

[0023] Figure 7 is Figure 6 Enlarged view of the structure of part I in Specific implementation manner

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0025] As Figures 1 to 3 shown, the central control wheel mainly consists of a mounting seat 1, a bracket 4 and a wheel. The mounting seat 1 is used to connect with the skeleton of the conveying device to install the central control wheel. The wheel is connected to the bracket 4, and the bracket 4 is rotatably connected to the mounting seat 1. Through the bracket 4, the wheel can rotate around the mounting seat 1 by a certain angle to realize the function of lifting or lowering. The bracket 4 is located on both sides of the wheel, and the mounting seat 1 is located on both sides of the bracket 4 to ensure the stability of the wheel. The middle part of the bracket 4 is rotatably connected to the mounting seat 1 through a pin shaft 12.

[0026] As Figure 4 , Figure 5 , the bracket 4 is connected to a guide rod 5, a rotating plate 14 is rotatably connected to the mounting seat 1, and the rotating plate 14 is hinged to the guide rod 5 through a connecting plate 6. The rotating plate 14 rotates around the mounting seat 1, which can drive the bracket 4 to rotate around the mounting seat 1 to realize the lifting and lowering of the wheel.

[0027] As Figure 6 , Figure 7 , to ensure the self-locking of the wheel in the lowered state, the hinge parts between the guide rod 5 and the connecting plate 6 and between the rotating plate 14 and the connecting plate 6 are respectively denoted as pin shafts 10 and 9, and the connecting part between the rotating plate 14 and the mounting seat 1 is a rotating shaft 2. Taking the connecting line of the rotating shaft 2 and the pin shaft 10 as the reference line, the pin shaft 9 is located below the reference line, that is, when the wheel is lowered, the pin shaft 9 is located below the dead point line. Thus, after the rotating plate 14 drives the wheel to lower, the wheel cannot be forced to lift passively and maintains self-locking stability.

[0028] A limit spacer 8 is provided on the mounting seat 1. Both ends of the limit spacer 8 are connected to both sides of the mounting seat 1. The limit spacer 8 is located in the space enclosed by the rotating plate 14, the connecting plate 6 and the guide rod 5. When the wheel is in the lowered state, the rotating plate 14 abuts against the limit spacer 8, and the limit spacer 8 limits the degree to which the pin shaft 9 crosses the reference line to ensure the normal operation when the wheel is lowered. When the wheel is lowered, as Figure 7, the centers of the rotating shaft 2, the pin shaft 9, the pin shaft 10, and the limit spacer 8 are respectively denoted as A, B, C, and D. At this time, there are: ∠CAD and ∠ACD need to be controlled between 32° and 38°, and ∠CAB and ∠ACB need to be controlled between 2° and 7°. If the angle is too large, it will affect the normal lifting of the wheel and its working state. A handle seat is connected to the rotating shaft 2, and the handle is inserted into the handle seat, which can drive the rotating plate 14 to rotate. The handle and the handle seat are detachably connected.

[0029] There are inclined slots on both sides of the mounting seat 1. The two ends of the pin shaft 10 are located in the inclined slots. When the bracket 4 rotates around the mounting seat 1 through the pin shaft 12, the pin shaft 10 slides in the inclined slots. The inclined slots are used to limit the pin shaft 10. When the rotating plate 14 drives the connecting plate 6 to move, the pin shaft 10 moves along the expected stroke. When the wheel is in the two states of lifting and lowering, the pin shaft 10 is respectively located at both ends of the inclined slot. The connecting plate 6 is a U-shaped plate. The two bent side plates of the connecting plate 6 symmetrically clamp the guide rod 5 and the rotating plate 14 on both sides, providing an installation position for the pin shaft 9 and the pin shaft 10. At the same time, it can support the front end of the mounting seat 1 and prevent the pin shaft 10 from deviating as a guide member, making the structure more stable and compact. The guide rod 5 is a spring rod, that is, a spring 3 is sleeved outside the guide rod 5. A long hole is opened at the bottom of the guide rod 5, and the pin shaft 11 is located in the long hole. The bracket 4 is connected to the pin shaft 11 and then connected to the guide rod 5, so that the wheel has a certain shock absorption function during use.

[0030] A limit block 13 is provided at one end of the bracket 4 away from the wheel. When the wheel is in the lifted state, the free end of the rotating plate 14 is tangent to the upper surface of the limit block 13. Thus, after the rotating plate 14 drives the wheel to lift, the free end of the rotating plate 14 abuts against the tail of the bracket 4, keeping the wheel in the lifted state, offsetting the self-weight of the wheel, and preventing the wheel from lowering due to gravity, ensuring the stability of the lifted wheel. A roller is provided at the free end of the rotating plate 14. Through the roller, the rotating plate 14 is tangent to the upper surface of the limit block 13.

[0031] A limit spacer 7 is also provided on the mounting seat 1. The two ends of the limit spacer 7 are connected to both sides of the mounting seat 1. The limit spacer 7 is located outside the space enclosed by the rotating plate 14, the connecting plate 6, and the guide rod 5. When the rotating plate 14 drives the bracket and the wheel to lift, the rotating plate 14 abuts against the limit spacer 7. The limit spacer 7 is used to limit the reverse rotation angle of the rotating plate 14.

[0032] As Figure 4 , when the wheel is in the lifted state, rotate the handle clockwise to drive the rotating plate 14 to rotate clockwise. At this time, the lower roller of the rotating plate 14 disengages from the limit block 13, and the other end slides along the inclined slot through the connecting plate 6 and the pin shaft 10 until it contacts the limit spacer 8. As Figure 5 , at this time, the wheel enters the lowering working state.

[0033] As Figure 5, when the wheel is in the lowered state, the handle can be operated to retract the wheel. Specifically: rotate the handle counterclockwise, and the wheel is driven by the connecting plate 6, the bracket 4, and the guide rod 5 to rotate counterclockwise. The pin shaft 10 slides along the inclined groove until the rotating plate 14 contacts the limit spacer 7 and stops, as Figure 4 , at this time, the free end of the rotating plate 14 abuts against the upper surface of the limit block 13, and the wheel is in the lifted state.

Claims

1. A center control wheel, comprising a mounting seat (1), a bracket (4) and a wheel, characterized in that: The wheel is rotatably connected to the mounting seat (1) through a bracket (4); a guide rod (5) is provided on the bracket (4); a rotating plate (14) is rotatably connected to the mounting seat (1); two ends of the connecting plate (6) are respectively hinged through a first pin shaft (10), a second pin shaft (9) and the guide rod (5) and the rotating plate (14); the rotating plate (14) drives the bracket (4) to rotate around the mounting seat (1) through the connecting plate (6) and the guide rod (5); a connecting line of the center of a rotating shaft (2) of the rotating plate (14) and the center of a first pin shaft (10) is used as a reference line; after the wheel is lowered, the second pin shaft (9) is located below the reference line.

2. The central control wheel according to claim 1, characterized in that: The mounting seat (1) is provided with a first limiting spacer (8), which is located in a space enclosed by a rotating plate (14), a connecting plate (6) and a guide rod (5); when the wheel is in a lowered state, the rotating plate (14) and the first limiting spacer (8) are in contact with each other.

3. The central control wheel according to claim 1, characterized in that: After the wheel is lowered, with the rotating shaft (2) or the first pin shaft (10) as the vertex, the angle formed between the first limiting spacer (8), the rotating shaft (2) and the first pin shaft (10) is in the range of 32° to 38°.

4. The central control wheel according to claim 1, characterized in that: After the wheel is lowered, with the rotating shaft (2) or the first pin shaft (10) as the vertex, the angle formed between the second pin shaft (9), the rotating shaft (2) and the first pin shaft (10) is in the range of 2° to 7°.

5. The central control wheel according to claim 1, characterized in that: The mounting seat (1) is provided with oblique grooves on both sides, and the two ends of the first pin shaft (10) are slidably connected to the oblique grooves. When the wheel is lifted or lowered, the first pin shaft (10) is respectively located at the two ends of the oblique groove.

6. The center control wheel according to claim 1, characterized in that: A limiting block (13) is provided at one end of the bracket (4) away from the wheel, and when the wheel is lifted, the free end of the rotating plate (14) abuts against the limiting block (13).

7. The central control wheel according to claim 6, characterized in that: A roller is provided at the free end of the rotating plate (14), and the free end of the rotating plate (14) abuts against a limit block (13) via the roller.

8. The central control wheel according to claim 1, characterized in that: The connecting plate (6) is a U-shaped plate, and two bent sides of the connecting plate (6) are clamped on both sides of the guide rod (5) and the rotating plate (14).

9. The center control wheel according to claim 1, characterized in that: The end of the guide rod (5) is provided with a long hole, and a spring (3) is sleeved on the outside. The guide rod (5) is connected with the bracket (4) via the long hole, the third pin shaft (11).

10. The central control wheel according to claim 1, characterized in that: The mounting seat (1) is provided with a second limiting spacer (7), and the two ends of the second limiting spacer (7) are connected to the two sides of the mounting seat 1. After the wheel is lifted, the rotating plate (14) abuts against the second limiting spacer, and the rotating shaft (2) is connected to a handle seat for inserting a handle.

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