CN111532316A

CN111532316A - Handcart suitable for different stair heights

Info

Publication number: CN111532316A
Application number: CN202010477082.4A
Authority: CN
Inventors: 何雪明; 赵千乙; 黄育鹏; 徐新生; 吕爽
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-08-14

Abstract

The invention discloses a trolley suitable for different stair heights, which has the advantage of being convenient for pulling the trolley to go upstairs and comprises a carrier, wherein the bottom of the carrier is provided with a driving device and a telescopic wheel set connected with the output end of the driving device, the telescopic wheel set comprises a main shaft frame coaxially connected with the output end, claw-shaped supporting plates positioned at two ends of the main shaft frame and stair climbing wheels positioned at arm ends of the claw-shaped supporting plates, the main shaft frame is linked with the supporting plates, and the supporting plates and the stair climbing wheels rotate relatively. The telescopic wheel set can adapt to stairs with different heights, if the height of the stairs is higher, the extending length of the ladder climbing wheel is increased, so that the ladder climbing wheel with the lowest vertical height can contact with a step higher than the first step when the ladder climbing wheel with the lowest vertical height is positioned on the first step; if the stair height is lower, then with the cat ladder wheel withdrawal, the route of cat ladder wheel every turn of round just shortens this moment, just also can adapt to low step environment.

Description

Handcart suitable for different stair heights

Technical Field

The invention relates to a trolley suitable for different stair heights, and belongs to the field of carrying and carrying devices.

Background

The stair reduces the area of a house, makes full use of the limited living space, provides a convenient channel for entering and exiting from a high-rise building, and establishes a link of vertical traffic connection. However, when people transport heavy objects to go upstairs, people feel very difficult, the existing small cart for auxiliary loading mainly adopts a planet wheel structure, the supporting force of the ground is utilized to help users save labor when going upstairs, a good stable state can be kept on the flat ground, but the small cart still needs to be lifted by the users during the upward transportation process, the limitation of the height of the stairs is large, and if the height of the stairs exceeds the height of the wheels, the planet wheel mechanism cannot play a supporting role.

Disclosure of Invention

The invention aims to provide a trolley suitable for different stair heights, which has the advantage of being convenient for pulling the trolley to go upstairs, and the technical scheme is as follows: the telescopic wheel group comprises a main shaft frame, claw-shaped supporting plates and ladder wheel, wherein the main shaft frame is coaxially connected with the output end, the claw-shaped supporting plates are arranged at two ends of the main shaft frame, the ladder wheel is arranged at the arm end of the claw-shaped supporting plates, the main shaft frame is linked with the supporting plates, and the supporting plates and the ladder wheel rotate relatively.

Further, the relative position between the ladder climbing wheel and the supporting plate is adjustable.

Further, the adjustable structure between cat ladder wheel and the backup pad is: the backup pad is equipped with two, reserves the clearance between two backup pads, is equipped with support frame, gear pair in this clearance, and the support frame extends to the three tip of backup pad, and meshes with gear pair, and gear pair rotates, drives the support frame and makes reciprocating motion along the arm of backup pad.

Furthermore, the gear pair comprises a large bevel gear and a small bevel gear meshed with the large bevel gear, the small bevel gear is located at any position of the circumference of the large bevel gear, and the small bevel gear is coaxially connected with the main shaft frame.

Furthermore, the small bevel gear is connected with the main shaft frame through a bearing, and the small bevel gear is in interference fit with the bearing.

Furthermore, one surface of the support frame facing the large bevel gear is provided with threads used for being meshed with the large bevel gear.

Furthermore, the end face of the large bevel gear is of a plane thread structure, and the plane thread face faces the support frame and is in thread engagement with the support frame.

Furthermore, one end of the supporting frame, which is close to the ladder climbing wheel, is set to be a U-shaped concave shape for accommodating the ladder climbing wheel, and the ladder climbing wheel is embedded into the concave and coaxially provided with a pin penetrating through the supporting frame and the ladder climbing wheel.

Furthermore, the gear pair protection device further comprises a shell used for covering the gear pair, and a hole convenient for extending out of the support arm is formed in the shell.

Furthermore, one side surface of the shell is provided with a hole for extending out of the axle of the bevel pinion.

The invention has the following beneficial effects:

compared with the conventional planetary wheel set, the telescopic wheel set has strict requirement on the height of the stairs, can adapt to the stairs with different heights, and can ensure that the ladder climbing wheel with the lowest vertical height can contact with the step with the higher vertical height when the ladder climbing wheel with the lowest vertical height is positioned on the step with the first level if the height of the stairs is higher; if the stair height is lower, then with the cat ladder wheel withdrawal, the route of cat ladder wheel every turn of round just shortens this moment, just also can adapt to low step environment.

The trolley provided by the invention is additionally provided with the driving device, is different from the conventional trolley which is pulled or pushed by manpower completely, and can greatly save the force of a user.

Drawings

FIG. 1 is a perspective view of a cart according to the present invention for accommodating different stairway heights;

figure 2 is a perspective view of the article carrier of the present invention;

figure 3 is a plan view of the article carrier of the present invention;

FIG. 4 is a perspective view of the retractable wheel assembly of the present invention;

FIG. 4-1 is a schematic view of a gear engagement structure for embodying the retractable wheel assembly of the present invention;

FIG. 5 is a perspective view of the driving device of the present invention;

FIG. 6 is a perspective view of a support plate according to the present invention;

FIG. 7 is a perspective view of the stand of the present invention;

FIG. 8 is a perspective view of the housing of the present invention;

FIG. 9 is a perspective view of the spindle bracket of the present invention;

FIG. 10 is a schematic cross-sectional view of a large bevel gear according to the present invention;

fig. 11 is a plan view schematically showing a large bevel gear according to the present invention.

In the figure, 1, a carrier; 2. a telescopic wheel set; 3. a drive device; 4. a chassis; 5. a side plate; 6. a base plate; 7. a motor case; 8. ladder climbing wheels; 9. a support frame; 10. a support plate; 11. a bearing; 12. a large bevel gear; 13. a pin; 14. a bevel pinion gear; 15. a main shaft bracket; 16. a housing; 17. a motor; 18. a bidirectional output reducer; 19. a coupling is provided.

Detailed Description

A handcart suitable for different heights of stairs is composed of a goods carrier, a telescopic wheel set at the bottom of said goods carrier, and a driver for driving said telescopic wheel set and connected to the bottom of said goods carrier. In this embodiment, the driving device uses a motor as a power source.

As shown in fig. 2 and 3, the luggage carrier includes a bottom frame, the bottom frame is configured in a rectangular plate shape, and two vertical edges of the rectangular plate extend towards two ends respectively. The side plates are arranged at the two vertical edges of the bottom frame and are arc-shaped plates, the side plates are bent from the vertical edges at the two sides of the bottom frame to the center of the bottom frame, and the two side plates are symmetrically arranged. The edge of the bottom frame close to the ground is provided with a bottom plate vertical to the surface of the bottom frame, and the length of the bottom plate is equal to that of the bottom edge of the bottom frame. The bottom plate, the side plate and the bottom frame are all welded. A motor box is arranged on one side of the bottom plate facing the ground, and the driving device is arranged in the motor box. In this embodiment, as shown in fig. 5, a bidirectional output reducer is connected to an output shaft of a motor of the driving device, two output ends of the bidirectional output reducer are respectively connected to a coupler, and the coupler connects the retractable wheel set to the bidirectional reducer.

As shown in fig. 4, each retractable wheel set includes a main shaft frame coaxially disposed with the shaft coupler, and a supporting plate disposed at one end of the main shaft frame away from the shaft coupler, and the supporting plate is an arm having an included angle of 120 ° between two pairs, so as to form a three-claw-shaped structure in a plane. The backup pad is equipped with two, reserves the clearance between two backup pads, is equipped with the support frame in this clearance, and the support frame extends to the three tip of backup pad, installs the cat ladder wheel through the round pin at the tip of backup pad, and the cat ladder wheel uses the round pin to make rotary motion as the center of motion.

As shown in fig. 7, the upper part of the supporting frame 9 is a U-shaped structure, and two symmetrical round holes are arranged above the supporting frame for connecting with the ladder climbing wheels 8. The lower part is a cuboid, one surface of which is in a thread structure and is used for being meshed and driven with the end surface of the large bevel gear 12.

As shown in fig. 8, the housing 16 is shaped as a cylindrical groove, and three rectangular holes are uniformly hollowed out along the outer ring. The rectangular holes are spaced at an angle of 120 degrees for extending out of the arms of the support frame 9. One side surface of the shell is provided with a hole for placing a small bevel gear shaft, and the hole is arranged by protruding the outer circle surface of the shell 6 so as to improve the rigidity of part of the structure. The whole shell 6 is in a cylindrical groove shape, and a round hole is formed in the bottom of the shell 6 and fixedly connected with the main shaft frame 15. The large bevel gear 12, the small bevel gear 14 and the support frame 9 are placed inside the housing 16 to prevent direct contact with the outside.

As shown in fig. 9, the spindle case 15 is composed of a rod and a plate. The two ends of the support rod are stepped shafts which are respectively connected with the driving device 3 and the support plate 10.

As shown in fig. 4-1, 10 and 11, the end face of the large bevel gear 12 is of a planar thread structure. The large bevel gear 12 may mesh with the small bevel gear 14. The end surface is threaded and can be in threaded engagement with the support 9. It can be connected to the spindle carrier 15 by an interference fit with the bearing 11. By rotating the bevel pinion 14, the bevel pinion 12 is rotated. Meanwhile, the rotary motion of the large bevel gear 12 can drive the support frame 9 to perform telescopic motion along the track of the support plate 10 through thread transmission, so that the height adjustment of the ladder climbing wheel is completed. After the adjustment is completed, the bevel pinion 14 is fixed, and the stair climbing can be performed.

The concrete process of the handcart climbing the stairs is as follows: after the large bevel gear 12 is driven by the small bevel gear 14, one side of the thread thereof drives the support frame 9, thereby driving the ladder climbing wheel to extend and retract, and adjusting the height of the ladder climbing. Then the small bevel gear 14 is fixed, because the large bevel gear 12 is meshed with the small bevel gear 14, the large bevel gear 12 will not drive the supporting frame 9 to move, and the ladder climbing wheel will not extend and retract. Next, the spindle carrier 15 is rotated by the motor, and since the large bevel gear 12 cannot rotate, the spindle carrier 15 only rotates the bearing 11. At this time, when the climbing ladder starts, the wheel set is driven to move by the rotation of the main shaft frame 15, for example, one climbing ladder wheel abuts against the first step, and the other climbing ladder wheel extends to the second step. In the process, the large bevel gear and the main shaft frame are not linked, so that the support frame cannot be driven to stretch and retract while the movement is ensured. The small bevel gear 14 is rotated by external force, and the large bevel gear 12 is driven by the small bevel gear 14 to extend and retract the ladder climbing wheel. After the bevel pinion 14 is adjusted to be fixed, the main shaft will not work the bevel pinion 12 when moving again.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a handcart of adaptation different stair height, includes carrier (1), its characterized in that, carrier (1) bottom is equipped with drive arrangement (3), with the flexible wheelset (2) that the output of drive arrangement (3) links to each other, flexible wheelset (2) include with output coaxial continuous main shaft frame (15), be located claw shape backup pad (10) at main shaft frame (15) both ends, be located cat ladder wheel (8) of claw shape backup pad (10) arm end, main shaft frame (15) and backup pad (10) linkage, relative rotation between backup pad (10) and cat ladder wheel (8).

2. A trolley according to claim 1, characterized in that the relative position between the ladder wheels (8) and the support plate (10) is adjustable.

3. A trolley according to claim 2, characterized in that the adjustable structure between the ladder wheels (8) and the support plate (10) is: backup pad (10) are equipped with two, reserve the clearance between two backup pads (10), are equipped with support frame (9), gear pair in this clearance, and support frame (9) extend to the three tip of backup pad (10), and mesh with the gear pair, and the gear pair rotates, drives support frame (9) and makes reciprocating motion along the arm of backup pad (10).

4. A trolley according to claim 3, characterized in that the gear pair comprises a large bevel gear (12) and a small bevel gear (14) engaged with the large bevel gear (12), the small bevel gear (14) is located at any position of the circumference of the large bevel gear (12), and the small bevel gear (14) is coaxially connected with the main shaft bracket (15).

5. A trolley according to claim 4, characterized in that the bevel pinion (14) is connected to the main shaft (15) by means of a bearing (11), and the bevel pinion (14) is in interference fit with the bearing (11).

6. A trolley according to claim 5, characterized in that the side of the support frame (9) facing the large bevel gear (12) is provided with a thread for engagement with the large bevel gear (12).

7. A trolley according to any one of claims 1-6, characterised in that the large bevel gear (12) has a planar thread on its end face, which faces the support frame (9) and is in threaded engagement with the support frame (9).

8. A trolley as claimed in claim 3, characterized in that the end of the support frame (9) near the ladder wheel (8) is provided with a "U" -shaped recess for receiving the ladder wheel (8), the ladder wheel (8) being embedded in the recess and coaxially provided with a pin (13) extending through the support frame (9) and the ladder wheel (8) itself.

9. A trolley according to claim 2, further including a housing (16) for enclosing the gear pairs, the housing (16) being provided with apertures for facilitating extension of the arms of the support frame (9).

10. A trolley according to claim 9, characterized in that the housing (16) is provided with a hole in one of its side faces for the extension of the axle of the bevel pinion (14).