Telescoping Pole Saw Clamp with Cam Mechanism
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Solution Overview
Problem
Telescoping pole tools, such as telescoping pole saws, face challenges with clamps that require many rotations to loosen and tighten, making them time-consuming and difficult to operate, and are prone to jamming.
Innovation Solution
A clamp system with an outer collar and inner collar that is rotatable between locked and unlocked positions, using a collet to secure the inner shaft within the outer shaft, allowing for minimal rotation to secure and adjust the tool length, and incorporating a biasing member and release button for easier operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional clamp designs are used, then the clamp can secure the inner and outer shafts, but the clamp requires many rotations to loosen and tighten, making it time-consuming and difficult to operate
Solution Approach 1:
The clamp incorporates a cam mechanism that converts rotational motion into linear motion, dynamically changing the clamping force application. The cam profile is designed to provide smooth, controlled engagement and disengagement, reducing the number of rotations needed while maintaining secure locking. This dynamic mechanism allows the clamp to transition quickly between locked and unlocked states.
Solution Approach 2:
The patent introduces a cam mechanism as an intermediary between the rotation input and the clamping action. This cam intermediary translates rotational movement into the necessary linear displacement for locking and unlocking, enabling easier operation with fewer rotations while maintaining the secure grip of the clamp on the shafts.
2Reliability
If traditional clamp designs are used, then the clamp can secure the shafts, but the clamp may jam and become difficult to loosen
Solution Approach 1:
The cam mechanism provides a self-latching feature where the cam profile geometry ensures that once engaged, the clamp securely locks the shafts. The cam's shaped surface distributes contact forces evenly, preventing binding and jamming. The dynamic nature of the cam engagement allows for smooth disengagement when the release mechanism is actuated, making the clamp reliable yet easy to loosen.
Solution Approach 2:
The clamp design utilizes changes in the cam profile geometry to control the clamping force parameters. During engagement, the cam profile gradually increases contact pressure, providing reliable locking. During disengagement, the cam profile geometry allows for controlled reduction of contact force, preventing jamming and enabling easy loosening with minimal effort.
3Reliability
If the clamp is designed to be secure and reliable, then the inner and outer shafts are well secured, but the clamp structure becomes more complex
Solution Approach 1:
The cam mechanism achieves secure shaft positioning through a single, elegantly designed cam profile rather than through complex multi-component structures. The cam's shaped surface creates the necessary clamping force and locking action through its geometry alone, maintaining reliability while minimizing structural complexity. The cam's rotation provides the dynamic action needed for secure engagement without requiring additional actuators or 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 clamp system provides efficient and secure adjustment of the telescoping pole tool length with minimal rotation, preventing jamming and reducing operator effort, while maintaining the inner and outer shafts in a desired locked position.
Implementation Method 1
a biasing member between the inner collar and the outer collar
Data Source
AI summary
A power tool includes a housing including an electric motor, a work element, a shaft extending between the housing and the work element, and a clamp coupled to the shaft and extending along a longitudinal axis between a first end and a second end. The shaft includes an outer shaft and an inner shaft. The clamp is actuatable between a locked position and an unlocked position. The inner shaft is configured to slide longitudinally within the outer shaft when the clamp is in the unlocked position. The outer shaft and the inner shaft are secured in a desired position when the clamp is in the locked position.