Drifting walker with rear wheel steering function
By setting up a rear wheel steering structure and push rod system in the rear wheel unit of the walker, the problem of disorderly steering of the front wheels after parents are removed is solved, and the rear wheels are automatically back-up, ensuring the stability and safety of the walker.
Patent Information
- Application Number
- CN202421449972.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-24
AI Technical Summary
The existing front-wheel steering walker will spontaneously and disorderly turn after parents take off their hands, resulting in the risk of path shifting and falling of the walker.
A drift walker for rear wheel steering is designed. By setting a rear wheel steering structure and push rod system in the rear wheel unit, the rear wheel unit ensures that the rear wheel automatically returns to the right under the action of friction and avoids disordered steering.
When the guardian is off-hand, the rear wheel steering system ensures the stable direction when the walker moves forward, avoids disordered steering and path deviation, and improves safety.
Smart Images
Figure CN222888787U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of baby walkers. Background Art
[0002] Existing two-wheeled walkers include two types: steerable and non-steerable. In conventional designs, the steering structure is generally set on the front wheel. The front wheel steering conforms to the ergonomic principle and has the characteristics of flexible steering. The use process of the walker based on the front wheel steering is roughly as follows:
[0003] After the child rides on the walker, the parent controls the steering of the front wheel by holding the joystick, thereby helping the child to control the direction of the walker;
[0004] However, parents cannot let go of this type of front-wheel steering walker, because children in the toddler stage do not have the awareness and ability to master the front wheel steering wheel. Once the parents let go, the front wheel of the front-wheel steering walker will spontaneously turn disorderly during the forward riding process, causing the walker's path to deviate and the risk of falling. Summary of the invention
[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a drift walker with rear-wheel steering, which ensures the steering function while avoiding the problem of disordered steering after the hands are let go.
[0006] Technical solution: To achieve the above-mentioned purpose, the utility model provides a rear-wheel steering drift walker, including a body, with a front wheel unit and a rear wheel unit at the front and rear of the body respectively, the rear wheel unit including a rear wheel and a rear fork, the rear wheel rotates on the rear fork, and the rear wheel end of the body is connected to the rear fork through a rear wheel steering structure.
[0007] Furthermore, the rear wheel steering structure includes a rear wheel steering shaft that is rotatably matched with the rear wheel end of the vehicle body, and one end of the rear wheel steering shaft is connected to the rear fork.
[0008] Furthermore, from the axial perspective of the wheel when the vehicle body is moving straight on a horizontal plane, the extension line of the rear wheel steering axis is recorded as straight line AB, the axis center of the rear wheel is recorded as point O, the intersection of straight line AB and the ground is recorded as point g, and the tangent point of the rear wheel and the ground is recorded as point h, satisfying the following relationship: point O is in front and above straight line AB, and point g is in front of point h.
[0009] Further, there are push rods at the rear wheel end of the body;
[0010] The lower end of the push rod is connected to the vehicle body, or the lower end of the push rod is connected to the rear wheel steering shaft.
[0011] Furthermore, there is a push handle at the end of the push rod.
[0012] Furthermore, a sleeve is fixed to the rear wheel end of the vehicle body, and the sleeve is sleeved outside the rear wheel steering shaft and rotated in conjunction.
[0013] Furthermore, the rear wheel of the rear wheel unit is a single wheel.
[0014] Furthermore, a saddle is provided between the front and rear wheels of the vehicle body, and a handle is fixed to one side of the vehicle body close to the front wheel unit.
[0015] Furthermore, the front wheel unit includes a front fork and a front wheel, the front wheel rotates on the front fork, and the front fork is fixedly connected to the vehicle body.
[0016] Furthermore, the wheel surface of the rear wheel or the front wheel is a spherical surface.
[0017] Beneficial effect: Since children in the toddler stage do not have the awareness and ability to master the steering wheel, this rear-wheel steering has the characteristic of not deviating from the direction disorderly when the guardian lets go of the walker and the walker moves forward autonomously. The reason is that since the front wheels will not turn, when the walker moves forward in the form of a child pushing the ground forward, the rear wheels 7 will automatically return to the straight line AB under the action of friction, so that the walker will move forward spontaneously without disorderly turning, thereby ensuring the safety of the walker when the guardian lets go of the walker.
[0018] At the same time, the geometric relationship limitation of this case not only makes it convenient for the guardian to hold the end of the push rod and the push handle and apply force at a suitable angle; at the same time, its geometric relationship makes it possible for the rear of the vehicle body to be subjected to the lateral force of the push handle, and the lateral friction force of the ground on the rear wheel is transmitted to the rear wheel steering axis under the interaction of forces, thereby forming a torque around the AB straight line, thereby driving the rear wheel unit to turn spontaneously. At the same time, when the walker is moving forward, based on the above-mentioned geometric relationship, the rear wheel automatically returns to the straight line AB under the action of friction. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Attached Figure 1 This is a schematic diagram of the overall structure of the baby walker;
[0020] Attached Figure 2 It is a schematic diagram of the forward state;
[0021] Attached Figure 3 For attachment Figure 2 Schematic diagram of geometric analysis. DETAILED DESCRIPTION
[0022] The utility model is further described below in conjunction with the accompanying drawings.
[0023] As attached Figure 1 , 2 A rear-wheel steering drift walker shown in 3 includes a body 2, wherein the body 2 has a front wheel unit and a rear wheel unit at the front and rear, a saddle 3 between the front and rear wheels of the body 2, and a handle 1 is fixed to one side of the body 2 close to the front wheel unit.
[0024] The rear wheel unit includes a rear wheel 7 and a rear fork 8, the rear wheel 7 rotates on the rear fork 8 through a bearing, and the rear wheel end of the vehicle body 2 is connected to the rear fork 8 through a rear wheel steering structure; the rear wheel steering structure includes a rear wheel steering shaft that rotates with the rear wheel end of the vehicle body 2, and the rear wheel unit makes a steering movement around the axis of the rear wheel steering shaft, and one end of the rear wheel steering shaft is connected to the rear fork 8; the rear wheel end of the vehicle body 2 is integrally fixed with a sleeve 10, the sleeve 10 is sleeved outside the rear wheel steering shaft, and rotates with the rear wheel steering shaft through a bearing to achieve rear wheel steering.
[0025] The front wheel unit includes a front fork 6 and a front wheel 5. The axis of the front wheel 5 rotates on the front fork 6 through a bearing. The front fork 6 is fixedly connected to the front lower side of the vehicle body 2. The rear wheel 7 and the front wheel 5 of the rear wheel unit in this case are both single wheels, and the wheel surface of the rear wheel 7 or the front wheel 5 is a spherical surface, so that when the vehicle body is tilted, the front and rear wheels are still in a rolling contact state with the ground, improving the stability of the baby walker. There is a push rod 9 at the rear wheel end of the vehicle body 2; there is a push handle 4 at the end of the push rod 9, which is convenient for the guardian to operate.
[0026] From the axial perspective of the wheels when the vehicle is moving straight on a horizontal plane,
[0027] like Figure 2 , let the extension line of the rear wheel steering axis be the AB line, let the axis of the rear wheel 7 be the O point, let the intersection of the AB line and the ground be the g point, let the tangent point of the rear wheel 7 and the ground be the h point, and satisfy the following relationship: the O point is above the AB line (above the front in the driving direction), and the g point is in front of the h point (in front of the driving direction),
[0028] Based on the above geometric relationship, we can know that Figure 3 As shown, when the upright rear wheel 7 is in the return state, the extension line of the support force F on the ground at point h of the rear wheel 7 intersects with the straight line AB; the support force F cannot form a torque around the straight line AB on the rear wheel 7, thereby making the rear wheel 7 have no tendency to turn in the free state.
[0029] like Figure 3 As shown, when the rear wheel 7 in the upright state is deflected around the straight line AB by a certain angle on the basis of the return state and becomes an upright and non-return state, it can be seen from the geometric relationship that point O has deflected around the straight line AB by a certain angle, and the extension line of the support force F on the ground at point h of the rear wheel 7 does not intersect with the straight line AB; when the extension line of the support force F does not intersect with the straight line AB, the component of the support force F perpendicular to the direction of the straight line AB constitutes a torque around the straight line AB for the rear wheel 7, so that the rear wheel 7 has a tendency to return to the straight line spontaneously under the action of the torque.
[0030] At the same time, the above-mentioned geometric relationship definition not only facilitates the guardian's grip on the end of the push rod 9 and the push handle 4 and the appropriate force application angle; at the same time, the above-mentioned geometric relationship makes it possible for the rear part of the vehicle body 2 to be subjected to a lateral force caused by the push handle 4 or the twisting of the child, and the lateral friction force of the ground on the rear wheel 7 is transmitted to the rear wheel steering shaft under the interaction of forces, thereby constituting a torque around the AB straight line, thereby driving the rear wheel unit to spontaneously turn, so that the vehicle body can achieve a drifting action. At the same time, based on the above-mentioned geometric relationship, the rear wheel 7 automatically returns to the straight line AB under the action of friction during the forward movement of the walker.
[0031] At the same time, since children in the toddler stage do not have the awareness and ability to master the steering wheel, this rear-wheel steering has the characteristic of not deviating from the direction disorderly when the guardian lets go of the walker and the child moves forward by pushing the ground forward, since the front wheels cannot turn, the rear wheels 7 automatically return to the straight line AB under the action of friction, so that the walker will move forward spontaneously without disorderly turning, thereby ensuring the safety of the guardian when the walker lets go.
[0032] In this case, two connection forms of the push handle 4 are provided, as follows:
[0033] First embodiment: The lower end of the push rod 9 is fixedly or rotatably connected to the vehicle body 2, so that no matter whether the guardian holds the push handle or not, the rear wheel 7 is spontaneously passively steered based on the aforementioned principle.
[0034] Second embodiment: The lower end of the push rod 9 is fixedly connected to the rear wheel steering shaft, so that the push rod 9 is equivalent to an extended structure of the rear wheel steering shaft, and the push handle 4 acts as a steering wheel. When the guardian holds it, the steering of the rear wheel is mainly based on the torque applied to the push handle 4 to the push rod 9.
[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A drift walker with rear-wheel steering, characterized in that: The vehicle comprises a vehicle body (2), wherein the vehicle body (2) has a front wheel unit and a rear wheel unit at the front and rear, respectively, the rear wheel unit comprises a rear wheel (7) and a rear fork (8), the rear wheel (7) rotates on the rear fork (8), and the rear wheel end of the vehicle body (2) is connected to the rear fork (8) via a rear wheel steering structure; The rear wheel steering structure comprises a rear wheel steering shaft rotatably matched with the rear wheel end of the vehicle body (2), and one end of the rear wheel steering shaft is connected to a rear fork (8); From the axial perspective of the wheel when the vehicle body is moving straight on a horizontal plane, the extension line of the rear wheel steering axis is recorded as straight line AB, the axis center of the rear wheel (7) is recorded as point O, the intersection of straight line AB and the ground is recorded as point g, and the tangent point of the rear wheel (7) and the ground is recorded as point h, satisfying the following relationship: point O is in front and above straight line AB, and point g is in front of point h.
2. A rear-wheel steering drift walker according to claim 1, characterized in that: A push rod (9) is provided at the rear wheel end of the vehicle body (2); the lower end of the push rod (9) is connected to the vehicle body (2), or the lower end of the push rod (9) is connected to the rear wheel steering shaft.
3. A rear-wheel steering drift walker according to claim 2, characterized in that: A push handle (4) is provided at the end of the push rod (9).
4. The rear-wheel steering drift walker according to claim 1, characterized in that: A sleeve (10) is fixed to the rear wheel end of the vehicle body (2), and the sleeve (10) is sleeved outside the rear wheel steering shaft and is rotationally matched.
5. The rear-wheel steering drift walker according to claim 1, characterized in that: The rear wheel (7) of the rear wheel unit is a single wheel.
6. The rear-wheel steering drift walker according to claim 1, characterized in that: A saddle (3) is provided between the front and rear wheels of the vehicle body (2), and a handle (1) is fixed to one side of the vehicle body (2) close to the front wheel unit.
7. The rear-wheel steering drift walker according to claim 1, characterized in that: The front wheel unit comprises a front fork (6) and a front wheel (5), wherein the front wheel (5) rotates on the front fork (6), and the front fork (6) is fixedly connected to the vehicle body (2).
8. The rear-wheel steering drift walker according to claim 7, characterized in that: The wheel surface of the rear wheel (7) or the front wheel (5) is a spherical surface.