Hole Saw Assembly Segmented Thread Clamping Mechanism
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Solution Overview
Problem
Existing hole saw assemblies often face difficulties in efficient coupling and decoupling from arbors, leading to complex constructions and potential locking issues that make removal challenging.
Innovation Solution
A hole saw assembly featuring a clamping device with first and second thread-engaging parts that move perpendicular to the longitudinal direction, allowing for quick coupling and decoupling by displacing between a disengaged and engaged position, with external surfaces engaging the internal thread for secure clamping, and incorporating rotation-blocking members to prevent locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple threaded coupling is used between the hole saw and arbor, then the construction is simple, but the hole saw tends to get locked onto the arbor making removal almost impossible
Solution Approach 1:
The threaded engagement is segmented into two separate thread-engaging parts instead of one continuous thread. These two parts can move relative to each other perpendicular to the longitudinal direction, allowing them to disengage from the internal thread simultaneously when moved apart, enabling easy removal without unscrewing the entire threaded connection manually.
Solution Approach 2:
The two thread-engaging parts are made movable relative to each other rather than being fixed. This dynamic design allows the parts to be easily separated perpendicular to the longitudinal direction to disengage from the internal thread during removal, while still providing secure engagement during operation when positioned along the longitudinal direction.
2Ease of operation
If driving pins are added to prevent locking, then removal becomes possible, but the arbor construction becomes more complex
Solution Approach 1:
The coupling mechanism is segmented into two separate thread-engaging parts that can move independently. This segmentation eliminates the need for additional driving pins or complex locking mechanisms on the arbor, as the segmented threads themselves provide the removal capability through their relative movement.
Solution Approach 2:
The two thread-engaging parts serve multiple functions: they provide secure threaded engagement during operation and enable easy removal when separated. This multi-functionality eliminates the need for separate driving pins or complex arbor constructions, as the thread-engaging parts themselves handle both engagement and release operations.
3Stability of the object's composition
If the thread-engaging parts are positioned along the longitudinal direction for secure engagement, then clamping stability is improved, but removal becomes difficult
Solution Approach 1:
The thread-engaging parts are designed to be dynamic rather than fixed. During operation, they are positioned along the longitudinal direction to provide stable clamping. During removal, they can be easily separated perpendicular to the longitudinal direction to disengage from the internal thread, enabling simple removal without manual unscrewing.
Solution Approach 2:
The design preliminarily prepares for removal by positioning the two thread-engaging parts such that they can be easily separated perpendicular to the longitudinal direction. This preliminary arrangement ensures that when removal is needed, the parts can be quickly disengaged from the internal thread without requiring forceful manual unscrewing, thus preventing the locking problem before it occurs.
Data Source
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AI summary
The invention relates to a hole saw assembly comprising a hole saw and an arbor for coupling said hole saw to a driving tool, said hole saw comprising a bottom wall provided with a hole with internal thread having a major and a minor thread diameter, and said arbor comprising a clamping device having a first and a second thread- engaging part, - said first thread-engaging part extending in a longitudinal direction and having a first external surface for in use engaging the internal thread; - said second thread-engaging part extending in said longitudinal direction and having a second external surface for in use engaging the internal thread; said first and second thread-engaging parts moveable with respect to one another with a component in a direction perpendicular to said longitudinal direction, allowing said first and second thread-engaging parts to displace between a first or disengaged position with respect to one another for together providing a first circumference allowing retraction from or insertion in said hole in a substantially longitudinal direction, and a second or engaged position having a second circumference that is larger than the first circumference, and in said second position said first and second external surfaces engaging said internal thread for clamping said clamping device in said hole.