Axial Lever Locking Device for Telescoping Poles

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Solution Overview

Problem

Conventional locking devices for telescoping poles require a large operating force and fail to provide sufficient locking force, especially for older users, due to limitations in design that lead to uneven clamping and reduced durability over repeated use.

Innovation Solution

A locking device with an axial lever mounted in the lengthwise direction of the pole, featuring a grasping tube with arch-shaped grasping pieces and operating pins that allow for fine adjustment of the locking force, ensuring uniform clamping and increased durability through the use of loosening prevention pads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If a conventional cam lever is used with a bent shape corresponding to the arches of connection tubes, then the locking device can be operated, but the lever length is limited and insufficient locking force is exerted

Engineering Contradiction:

Improvelocking forceVSAvoidlever length

Core Design Contradiction:

ForceVSLength of moving object

Solution Approach 1:

The grasping circle member is divided into upper and lower independent arch-shaped grasping pieces with separate operating pins, allowing each side to be clamped independently and uniformly, which resolves the force distribution problem while maintaining lever operation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cam lever is reoriented to rotate in the lengthwise direction of the pole rather than radially, extending the lever length in the axial dimension and providing sufficient mechanical advantage for locking operation

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Stability of the object's composition

If the grasping circle member is incised only on one side, then the structure is simple, but the clamping force is not applied uniformly to the entire circumferential surface

Engineering Contradiction:

Improveuniform clampingVSAvoidgrasping member structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The single incised grasping circle member is segmented into upper and lower independent arch-shaped grasping pieces, each with its own operating pin, enabling uniform clamping force distribution around the circumferential surface while maintaining structural simplicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each arch-shaped grasping piece is independently clamped by its own operating pin, allowing localized force application that collectively achieves uniform circumferential clamping without requiring complex overall structure

Inventive Principle:

Principle #3Local quality

3Force

If the arch length of the grasping circle member is substantially long, then the structure can accommodate the connection tubes, but the grasping member becomes loose and locking force decreases

Engineering Contradiction:

Improvelocking forceVSAvoiddurability

Core Design Contradiction:

ForceVSDuration of action of stationary object

Solution Approach 1:

The long arch-shaped grasping circle member is divided into upper and lower segments with independent operating pins, preventing loosening and maintaining consistent locking force over repeated uses by eliminating the cumulative wear problem of a single continuous arch

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The independent operating pins allow each arch-shaped grasping piece to dynamically adjust and maintain optimal clamping pressure, preventing the loosening that occurs in continuous arch structures during repeated locking cycles

Inventive Principle:

Principle #15Dynamics

4Force

If the contact point of the cam face is far from the center of the grasping circle member, then the cam lever can be operated, but the pulling force is lost before being applied to the grasping member

Engineering Contradiction:

Improveforce transmission efficiencyVSAvoidoperating force

Core Design Contradiction:

ForceVSEase of operation

Solution Approach 1:

The cam lever rotation plane is changed from radial to axial orientation, repositioning the force application point closer to the center of the grasping circle member and improving force transmission efficiency to the clamping mechanism

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 enables a high locking force to be achieved with a small operating force, maintaining durability and allowing for easy adjustment, thus improving usability for all users, including older individuals, by ensuring even clamping and reducing deformation.

Implementation Method 1

an axial lever is disposed in the lengthwise direction of the pole to apply a clamping force to both left and right sides of upper and lower connection tubes in the radial direction, thereby requiring a relatively small operating force, increasing a locking force

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Implementation Method 2

the cam lever 40 is pressed toward the grasping circle member 20, the cam face 42 is rotated to pull the operating pin 30

Methodology Applied

Scientific EffectCam mechanism: Cam

Data Source

PatentUS8832910B2Locking device for pole

Publication Date: 2014.09.16 LAH JEH KUN

AI summary

The present invention relates to a locking device for a pole, including: a grasping tube having incision portions; operating pins adapted to be inserted in an up and down direction into upper and lower pressing parts; and an axial lever having a pressing plate extended in the lengthwise direction of the pole.