Toggle Wedging Shoe for Wheel Immobilization
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Solution Overview
Problem
Existing wheel wedging devices are complex and require significant civil engineering work for installation, and they often become difficult to disengage from the wheel, especially when tire pressure increases due to loading, making it hard to remove the wedging shoe without moving the machine.
Innovation Solution
A wheel wedging shoe with a toggle mechanism connected to the base by two articulated rods, featuring an elastic return device that allows easy disengagement by breaking the toggle joint, facilitated by a pedal-operated latch and a guide lever, ensuring the shoe can be easily removed from the wheel in all circumstances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wedge chock is used to immobilize the wheel, then the wheel rotation is effectively prevented, but the chock becomes difficult or impossible to remove when tire pressure increases due to loading
Solution Approach 1:
The patent applies the dynamics principle by making the support ramp movable relative to the base through a toggle mechanism. The ramp can transition between a wedging position (for effective immobilization) and a release position (for easy removal). This dynamic structure allows the system to adapt its state based on operational needs, resolving the contradiction between reliable immobilization and ease of removal.
Solution Approach 2:
The patent segments the wedging device into two main components: a fixed base and a movable support ramp. The ramp is connected to the base through a toggle mechanism that allows independent movement. This segmentation enables the ramp to be positioned for wedging or retracted for removal without moving the entire device or the wheel, solving the removal difficulty problem while maintaining immobilization effectiveness.
2Reliability
If an abutment stop is used to hinder wheel movement, then the wheel is effectively restrained, but major civil engineering work is required for ground anchoring and installation
Solution Approach 1:
The patent applies the self-service principle by designing a device that uses the wheel's own weight and tire pressure to achieve effective restraint, eliminating the need for ground anchoring. The toggle mechanism automatically locks the ramp in the wedging position when force is applied, and the elastic return device automatically returns the ramp to the release position when force is removed. This self-servicing mechanism resolves the contradiction by providing reliable restraint without complex installation infrastructure.
Solution Approach 2:
The patent employs a simple, lightweight structure that requires no permanent installation or ground modification. The device can be easily deployed and removed as needed, functioning as a temporary but effective restraint solution. This approach replaces expensive, permanent civil engineering structures with a simple, portable device that achieves the same functional goal without long-term installation commitments.
3Reliability
If the chock pressure on the ground increases to improve grip, then the immobilization effectiveness increases, but the chock becomes even more difficult to remove without moving the machine
Solution Approach 1:
The patent applies dynamics by making the support ramp movable through a toggle mechanism connected to an elastic return device. When the wheel exerts pressure, the toggle mechanism locks the ramp in the wedging position, providing strong grip. When removal is needed, the elastic return device automatically returns the ramp to the release position, enabling easy disengagement regardless of how strong the grip became during immobilization.
Solution Approach 2:
The patent introduces an elastic return device as an intermediary between the toggle mechanism and the support ramp. This intermediary component stores energy when the ramp is in the wedging position and releases it to return the ramp to the release position. This mediator enables automatic reset functionality, resolving the contradiction by providing strong grip during operation while ensuring easy removal when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for effortless disengagement of the wedging shoe from the wheel without moving the machine, reducing operational effort and eliminating the need for extensive civil engineering work during installation, while maintaining effective immobilization of the wheel.
Implementation Method 1
an elastic return device which elastically opposes the breaking of the toggle joint and returns the toggle joint to the open position
Implementation Method 2
the wedge may be movably mounted at the end of an arm... the chock engages between the base of the tire and the ground. Any rotation of the wheel in the direction of the chock increases the pressure that the chock exerts on the ground and therefore its adhesion by a wedging phenomenon
Data Source
Figure 1
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AI summary
The invention relates to a halting shoe for halting the wheel of a vehicle rolling on the ground. The shoe includes a base (2) for resting against the ground surface, and an oblique support ramp (3) to be engaged under the tread of the wheel. The support ramp represents the outer surface of a panel (9) capable of displacement relative to the base (2) between a halting position in which the support ramp (3) is inclined relative to the base at a given halting angle, and a clearance position in which the support ramp (3) is inclined relative to the base at an angle lower than the given halting angle. The invention also relates to a powered halting assembly including such shoe.