Double Dolly Hand Cart System with Jack Stabilization
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Solution Overview
Problem
Current hand truck systems lack the ability to safely lift and move heavy or bulky items, as they often tip backwards, potentially injuring the operator due to the lack of lifting capacity and stability.
Innovation Solution
The double dolly hand cart system consists of two interconnected dollys with jack support plates, movable wheels, cranks, and straps, allowing for the secure lifting and stabilization of heavy items, enabling one-handed operation and reducing the risk of injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single hand truck is used to move heavy items, then the device complexity is low, but the stability and safety deteriorate due to tipping hazards
Solution Approach 1:
The patent combines two hand trucks into a coupled system where the first hand truck and second hand truck are connected through coupling mechanisms (straps, chains, cables, or rigid couplers). This merging allows the weight of heavy items to be distributed across both hand trucks, preventing the tipping hazard that occurs with a single hand truck while maintaining manageable device complexity through standardized coupling components.
2Ease of operation
If a single hand truck is used to move heavy items, then the ease of operation is high, but the stability deteriorates causing operator injury risk
Solution Approach 1:
By coupling two hand trucks together, the system maintains ease of operation (a single operator can still maneuver the combined system) while significantly improving stability. The distributed weight bearing and extended base of support provided by two coupled hand trucks prevent the instability and tipping that characterizes single hand truck operation with heavy loads.
Solution Approach 2:
The coupling system creates a balanced weight distribution where the second hand truck acts as a counterbalance to the first hand truck when moving heavy items. This counterbalancing effect stabilizes the load and prevents the operator from being pushed backward, addressing the stability issue while preserving ease of operation.
3Reliability
If lifting capacity is increased to move heavy items safely, then the reliability improves, but the device complexity increases
Solution Approach 1:
Instead of adding complex lifting mechanisms to a single hand truck, the patent merges two hand trucks into a coupled system. This approach increases effective lifting capacity and safety by distributing the load across two independent hand trucks, avoiding the need for complex mechanical lifting devices while achieving the desired reliability improvement.
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 system provides a safe and efficient means to move heavy household items by stabilizing the load between two dollys with jacks, allowing for balanced lifting and reduced operator strain, enhancing safety and ease of use.
Implementation Method 1
Each dolly includes a jack, along with a crank and a hitch attached to lift the item to be moved off the ground
Implementation Method 2
movable wheels that are six inches, more or less, in diameter
Data Source
AI summary
The invention relates to adding jacks to hand-operated dollys which allows a heavy household item to be lifted and moved around, as needed. The system includes two separate dollys facing each other. In use, the double dollys face each other. Each dolly includes a jack support plate atop movable wheels that are several inches in diameter. A jack is provided to lift the item to be moved off the ground. Each dolly also includes a dolly frame with a ledge which raises the height of the item being lifted, in accordance with movement of the jack. The double dolly includes straps connect the dollys, with the item to be moved secured between the two dollys. This stabilizes the item being lifted and moved.