Inverted Threaded Rod Clamp for Compact High-Load Fastening
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Solution Overview
Problem
Existing fastening devices for motor vehicle carriers, such as bicycle carriers, face challenges in being compact, resilient, and providing optimal force transmission, especially when space is cramped and high load-bearing capacity is required.
Innovation Solution
A fastening device with a clamp design where the threaded rod protrudes from the inner cross-section, featuring inclined surfaces between the clamping body and annular body, and a tie rod system that allows for direct support and adjustment, enabling optimal force transmission and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the clamping body is arranged to the side of the carrier body, then the fastening device can be designed compactly, but optimal force transmission between the carrier body and clamp is not achieved
Solution Approach 1:
Instead of arranging the threaded rod (clamping body) to the side of the carrier body as in conventional clamps, the invention inverts this arrangement by positioning the threaded rod to protrude directly from the center of the carrier body. This central positioning optimizes force transmission while maintaining compact design through the radial arrangement of clamping arms.
Solution Approach 2:
The clamp features asymmetric positioning of the threaded rod relative to the clamping arms. The threaded rod is centrally positioned on the carrier body while the clamping arms extend radially outward at specific angles, creating an asymmetric force distribution pattern that optimizes both compactness and force transmission efficiency.
2Force
If the threaded rod protrudes from the center of the clamp, then optimal force transmission is achieved, but the device complexity increases
Solution Approach 1:
The invention merges the carrier body and clamping body into a more integrated structure. The threaded rod serves dual functions as both the actuating mechanism and the central support element, while the clamping arms are directly attached to the carrier body, reducing the number of separate components and simplifying the overall structure despite the centralized force transmission design.
Solution Approach 2:
The threaded rod performs multiple functions: it acts as the actuating mechanism for opening and closing the clamp, serves as the central support structure, and provides the primary force transmission path. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving optimal force transmission.
3Volume of moving object
If the clamp is designed to be compact, then it takes up less space on the carrier, but the load-bearing capacity and stability are reduced
Solution Approach 1:
The clamp employs a radial, arm-like structure that distributes loading forces evenly around the central threaded rod, similar to how a spherical structure distributes stress. This radial arrangement allows the clamp to maintain a compact footprint while achieving high load-bearing capacity through efficient force distribution across multiple clamping points.
Solution Approach 2:
The spring element is pre-loaded to continuously apply clamping force to the clamping arms, ensuring that the clamp maintains optimal contact pressure with the carried object. This preliminary action ensures high load-bearing capacity is ready immediately when needed, without requiring additional space for separate tensioning mechanisms.
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 provides a compact, resilient, and high-load-bearing fastening device that ensures efficient force transmission and easy handling, allowing for secure attachment and detachment of objects like bicycles on motor vehicle carriers.
Implementation Method 1
The inclined surfaces can then be arranged directly one on top of the other
Implementation Method 2
the at least one inclined surface is a wedge surface
Implementation Method 3
the threaded rod that serves as a clamping body protrudes from the inner cross section
Implementation Method 4
The fastening device has a spring arrangement, in particular a resilient element
Data Source
Figure 1~2
Figure 3~4
Figure 5a~9c
AI summary
The mechanism (30) has a clamping body (50) for clamping annular body clamping ends (42) of an annular body (41) of a clip (40) to each other. The body is movably supported along a linear tensioning motion path, which is directed to a central area (39) of an inner cross-section of the clip from a release position (L) into a clamping position. An angular surface (38) is provided between the body and one of the ends for clamping force application transverse to the motion path, where distance of the surface from the path is increased in direction of the central area.