Telescoping Snow Rake Pole Locking Mechanism
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Solution Overview
Problem
Existing snow rakes with telescoping poles face issues such as segment deformation, difficulty in locking and unlocking segments, especially when wearing gloves, and inadequate friction to prevent relative movement between pole segments, leading to ineffective use.
Innovation Solution
A snow rake with a telescoping pole featuring keyed rib and groove arrangements to prevent rotation and a lock device that secures pole segments at various axial positions, along with a friction locking mechanism to resist axial separation, allowing for adjustable length and improved control during snow removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminum pole segments with thin walls are used, then weight and price are reduced, but the segments are easily permanently deformed by minor distance drops
Solution Approach 1:
The pole is divided into multiple telescoping segments that can extend and retract. Each segment is protected by a telescoping mechanism that prevents direct contact with hard surfaces, reducing deformation risk while maintaining lightweight aluminum construction.
Solution Approach 2:
The telescoping mechanism provides built-in protection before deformation can occur. The nested segment structure acts as a cushioning system that absorbs impact forces, preventing minor drops from causing permanent deformation to the thin-walled aluminum segments.
2Reliability
If snap pin locking mechanism is used, then pole segments are effectively locked together, but it is difficult to accomplish locking and unlocking while wearing gloves in cold weather
Solution Approach 1:
A lock device serves as an intermediary mechanism between the user and the pole segments. This device provides a larger surface area and mechanical advantage, allowing users to lock and unlock segments easily even when wearing gloves in cold weather, while maintaining reliable locking through the snap pin mechanism.
3Reliability
If friction locking mechanism with fixed surface area is used, then pole segments are secured together, but insufficient friction prevents relative movement between segments under large axial forces
Solution Approach 1:
The lock device provides dynamic adjustment capability, allowing the frictional contact surface area to increase based on the applied axial force. This enables the mechanism to maintain secure locking under varying load conditions, preventing relative movement between segments whether the axial force is small or large.
4Length of moving object
If multi-segment pole construction is used, then desired pole length is obtained, but the length is fixed at certain increments and relative longitudinal and rotational movement is prevented
Solution Approach 1:
The telescoping mechanism enables dynamic length adjustment, allowing the pole to be extended or retracted to desired lengths. The lock device provides selective locking capability, permitting controlled movement between segments while maintaining stability when locked, thus providing both adjustability and movement freedom as needed.
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 robust and adjustable telescoping pole that effectively resists axial separation and rotation, enabling efficient snow removal with minimal deformation and easy operation, even when wearing gloves.
Implementation Method 1
The surface area of frictional contact is fixed by the shape of the two engaging surfaces, round and smooth. To increase the frictional force, increased compression is needed
Implementation Method 2
At least one of the pole segments has an exterior surface portion received inside another of the pole segments. The pole segments are keyed with a rib and groove arrangement to positively resist relative rotation therebetween
Data Source
AI summary
A telescoping pole and blade to form a snow rake. The pole has a plurality of segments selectively axially movable relative to one another. The pole segments are keyed to one another to prevent relative rotation between adjacent pole segments. A lock device is associated with adjacent pairs of pole segments to selectively fix the relative axial positions of the pairs of pole segments.