Strap Pipe Wrench Movable Connecting Member Adjustment
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Solution Overview
Problem
Existing strap pipe wrenches require lengthy and repetitive manual adjustments to change the working length of the strap, making the process inefficient.
Innovation Solution
A strap pipe wrench with a movable connecting member that includes locking elements, a resilient biasing element, and a control member for ergonomic adjustment, allowing the strap to transition from a loose to a tightly tensioned state with a ratchet effect for easier handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a screw/nut system is used to connect the strap to the handle, then the strap can be adjusted manually, but the adjustment process becomes lengthy and repetitive
Solution Approach 1:
The connecting member is made movable along the longitudinal axis of the handle, transitioning between a first position (loose state) and a second position (tensioned state). This dynamic positioning allows rapid adjustment of the strap's working length without manual screwing or repetitive operations, directly resolving the time-consuming adjustment problem.
Solution Approach 2:
The adjustment mechanism is segmented into distinct functional elements: locking elements (pistons) that engage with the rod at specific positions, a resilient biasing element (spring) that provides automatic tensioning, and a control member that activates the transition. This segmentation allows each component to perform its specific function efficiently, enabling quick strap adjustment.
2Loss of time
If the connecting member is made movable to enable quick adjustment, then adjustment time is reduced, but the device complexity increases due to locking elements and control mechanisms
Solution Approach 1:
The resilient biasing element (spring) automatically urges the connecting member toward the second position (tensioned state) when the control member is activated. This self-service mechanism eliminates the need for complex manual tensioning operations, reducing device complexity while maintaining quick adjustment capability.
Solution Approach 2:
The rod acts as an intermediary element that connects the control member to the connecting member. It transmits the activation force from the control member to the connecting member, enabling smooth transition between positions while simplifying the overall control mechanism through a single mediating component.
3Reliability
If locking elements are added to fix the connecting member in position, then strap tension stability is improved, but the device complexity increases
Solution Approach 1:
The locking elements (pistons) are designed to engage with the rod at specific positions dynamically. When the connecting member is in the first position, the pistons engage with the rod to lock it; when in the second position, the engagement changes to maintain tension. This dynamic locking provides stability without requiring complex fixed locking mechanisms.
Solution Approach 2:
The locking mechanism utilizes changes in the positional parameter of the connecting member along the longitudinal axis. As the connecting member moves between the first and second positions, the locking elements automatically engage or disengage based on the position, providing stable tension without complex control logic.
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
Facilitates quick and ergonomic adjustment of the strap tension, improving user experience and efficiency in applications like oil filter wrenches by reducing the complexity and time required for strap length adjustment.
Implementation Method 1
a resilient biasing element, especially a compression or draw spring, which urges said member towards the second position
Implementation Method 2
the locking elements comprise at least one piston, preferably two pistons, carried by the connecting member, the or each piston being in abutment in a groove formed on the rod when the connecting member is in its first position
Implementation Method 3
the rod comprises at least one rack in which there engages at least one retaining finger carried by the connecting member when the latter is in its second position
Implementation Method 4
the rod is mounted for rotation relative to the connecting member and to the handle about an axis of rotation that is substantially coincident with the longitudinal axis of the handle
Implementation Method 5
the abutment shoe is adapted to produce a ratchet effect for unidirectional driving of said object
Implementation Method 6
driving resulting from a toggle lever effect
Data Source
AI summary
A strap pipe wrench for driving an object having a generally cylindrical shape includes a handle which extends along a longitudinal axis, a connecting member which is movable relative to the handle in a direction parallel to the longitudinal axis, and a strap formed in a loop and having two opposing end portions which cooperate with two zones integral with the handle when the strap surrounds the object tightly, the two opposing end portions of the strap being attached to the connecting member, a displacement device for displacing said connecting member, and enabling the size of the loop of the strap to be adjusted and the strap to be tensioned when it surrounds the object tightly, and a shoe disposed between the two zones for abutment on the object, the shoe having an abutment face of generally arcuate shape.