Tensioning Device with Opposite-Direction Threads for Quick Clamping
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Solution Overview
Problem
Existing motor vehicle carrier clamping devices require a large number of turns to switch between clamped and released positions due to self-locking threads, making operation inconvenient.
Innovation Solution
A tensioning device with a spacer body having a threaded section with opposite rotation direction to the nut arrangement's threaded section, combined with a frictional or form-fit connection to the abutment body, allowing the nut and tie rod to move axially during rotation, thereby reducing the number of turns required for clamping and releasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-locking threads are used in the clamping device, then the clamping position is secure and reliable, but a large number of turns are required to switch between clamped and released positions
Solution Approach 1:
The nut arrangement is divided into two functional parts: a first threaded section that meshes with the tie rod for self-locking clamping, and a second threaded section with opposite rotation direction that meshes with the spacer body for rapid position adjustment. This segmentation allows the device to achieve both secure clamping and easy operation by separating these two functions into distinct threading mechanisms.
Solution Approach 2:
The patent combines two threaded sections with opposite rotation directions into a single nut arrangement that interacts with both the tie rod and spacer body. This merging allows simultaneous engagement of both threading mechanisms, enabling the user to achieve rapid adjustment through the spacer body while maintaining secure clamping through the tie rod engagement.
2Stability of the object's composition
If the pitch of threaded sections is designed for self-locking, then the clamping position is stable, but the number of turns required for adjustment increases
Solution Approach 1:
The threading system is segmented into two sections with different pitch characteristics: the first threaded section uses a pitch optimized for self-locking and stability, while the second threaded section uses a pitch optimized for rapid adjustment. This segmentation allows each section to be optimized for its specific function without compromise.
Solution Approach 2:
The spacer body acts as an intermediary element between the user's rotational input and the final clamping action. By engaging the second threaded section with opposite rotation direction, the spacer body translates rotational motion into rapid axial adjustment, serving as a mediator that decouples the adjustment speed requirement from the clamping stability requirement.
3Device complexity
If a single threaded section is used in the nut arrangement, then the structure is simple, but the device cannot achieve both rapid adjustment and secure self-locking
Solution Approach 1:
The patent merges two threaded sections with opposite rotation directions into a single integrated nut arrangement. This combination allows the device to perform multiple functions (rapid adjustment and secure self-locking) within a unified component structure, achieving functional versatility without significantly increasing overall device complexity.
Solution Approach 2:
The dual-threaded nut arrangement serves multiple functions simultaneously: the first threaded section provides self-locking clamping, while the second threaded section enables rapid adjustment. This multi-functionality allows a single component to address both the stability requirement and the ease of operation requirement, making the device adaptable to different operational needs.
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
Enables quick and convenient operation with a secure clamping position, maintaining self-locking functionality while minimizing the number of turns needed for clamping and releasing.
Implementation Method 1
between the spacer body and a counterhold, in particular the abutment body, has a frictional connection and/or form fit effective against a rotary actuation
Implementation Method 2
a first threaded section which meshes with a tie rod threaded section of the tie rod in order to fasten it along a clamping axis axially
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The apparatus (40a) has a nut arrangement (42a) screwed onto a tie rod (41). The arrangement comprises a threaded section (49), which meshes with a tie rod threaded section (46). A distance body (43a) i.e. plain washer, is provided with a distance body threaded section (59). A frictional closure and/or form closure effective against a rotating operation is present between the distance body and a counter bearing body (57), so that the arrangement is screwed to the distance body and the tie rod during the operation and changes a distance to the counter bearing body along a clamping shaft.