Torque-Limited Wedging System for Compact Load Securing
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Solution Overview
Problem
Existing wedging systems for securing loads in vehicles face challenges such as size constraints, complex assembly and disassembly, risk of blocking due to corrosion, and the need for compact, remotely actuatable, and reusable devices that can withstand compressive forces without damaging the loads.
Innovation Solution
A wedging system comprising endless screws, toothed wheels, torque limiting mechanisms, and a drive mechanism that allows simultaneous actuation of multiple wedging devices, with irreversible connections and spring-loaded components to manage torque and prevent damage, enabling compact, reliable, and remotely controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the wedging device is made compact to fit confined spaces, then the device can be inserted between loads and ceiling, but the manipulation space for tools is reduced
Solution Approach 1:
The patent combines multiple functions into a single integrated tool head that includes both the wedging device actuation mechanism and the torque application mechanism. This merging allows the operator to use one tool for both setting and torquing the wedging device, compensating for the reduced manipulation space caused by the compact size of the wedging device.
2Reliability
If the wedging device uses mechanical parts for reliability, then the device can be disassembled after long use, but the risk of blocking due to corrosion increases
Solution Approach 1:
The patent replaces traditional mechanical fastening elements (screws, nuts, bolts) with a snap-fit or interference-fit based assembly system. The housing and internal components are designed to snap together or fit tightly without requiring threaded connections, eliminating the corrosion risk associated with threaded mechanical parts while maintaining disassemblability for maintenance and reuse.
3Ease of operation
If the wedging device is actuated remotely, then the operator can control devices not within easy reach, but the device complexity increases
Solution Approach 1:
The patent introduces a cable-actuated mechanism as an intermediary between the operator and the wedging device. The cable transmits the actuation force from a remote location to the wedging device, enabling remote operation without requiring complex electronic or hydraulic systems. This mechanical intermediary maintains simplicity while achieving remote actuation capability.
4Strength
If the wedging force is limited to prevent load damage, then the loads are protected, but the device cannot withstand significant compressive force in impact events
Solution Approach 1:
The patent employs a dynamic torque limiting mechanism that allows the wedging device to operate at limited torque during normal loading to protect the load, but can withstand higher impact forces when necessary. The torque limiting feature disengages or yields under excessive force, allowing the device to absorb impact energy while preventing damage to the load during controlled operation.
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 compact, reliable, and reusable solution for securing loads, ensuring safe operation by managing torque and preventing damage, while allowing remote actuation and simultaneous control of multiple devices, addressing the limitations of existing systems.
Implementation Method 1
an endless screw (58) adapted, when driven in a first direction of rotation, to displace the plate (32) in a first direction and adapted, when driven in a second direction of rotation opposite to the first direction of rotation, to move the plate (32) in a second direction opposite to the first direction
Implementation Method 2
a torque limiting mechanism (61, 112) between the wheel (70) and the nut (72) or between a drive shaft (44) and the worm (58)
Implementation Method 3
a first spring permanently exerting a thrust on the dog clutch (62) against the endless screw (58)
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
A securing device (22) comprising an endless screw (58) cooperating with a toothed wheel (70), a nut (72) connected to the toothed wheel and comprising an at least partially threaded first opening (80), an at least partially threaded rod (86) cooperating with the first opening, a plate (32) connected to the rod and a mechanism for limiting the torque between the wheel and the nut or between a drive shaft (44) and the endless screw.