Telescopic Pipe Stopper Force Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing telescopic pipe systems in working machines face issues with the stopper becoming detached due to concentrated force on rivets when the pipe extends and retracts repeatedly, leading to potential damage and loss of fixation.
Innovation Solution
The design incorporates a stopper with protruding parts that distribute force evenly across the rear surface, preventing concentration and ensuring the stopper remains fixed to the inner pipe, even with repeated extension and retraction, by having protruding parts that fit into elongated fixing holes with specific surface orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a round columnar rivet is used to fix the stopper to the inner pipe, then the stopper can be securely fixed, but the rivet becomes damaged due to concentrated force when the telescopic pipe extends and retracts repeatedly
Solution Approach 1:
The invention changes the geometric parameters of the fixing structure by replacing a round columnar rivet with a flat plate-shaped stopper having a flat rear surface. This parameter change transforms the stress distribution from concentrated (at a point on the round rivet) to distributed (across the entire flat rear surface of the stopper), preventing rivet damage while maintaining secure fixation.
2Device complexity
If the stopper is fixed using a round rivet, then the assembly is simple, but the concentrated force causes damage to the rivet during repeated extension and retraction
Solution Approach 1:
The invention modifies the geometric parameters of the stopper from a round columnar shape to a flat plate shape with a flat rear surface. This simple parameter change maintains the simplicity of the fixation structure while fundamentally improving reliability by distributing force across the entire rear surface, preventing damage during repeated telescopic operations.
3Device complexity
If force is concentrated at a certain point of the rivet, then the fixation structure is simple, but the concentrated force damages the rivet during repeated use
Solution Approach 1:
The invention changes the geometric parameters of the stopper to include a flat rear surface, which transforms the force distribution from concentrated (at a point) to distributed (across the entire surface). This parameter change maintains structural simplicity while preventing damage by spreading the force over a larger area during repeated extension and retraction.
Solution Approach 2:
The invention converts the potentially harmful concentrated force into a beneficial distributed force pattern. By designing the stopper with a flat rear surface, the force that would otherwise concentrate and damage the rivet is redistributed across the entire contact surface, turning a harmful effect into a beneficial one that enhances durability.
Data Source
AI summary
A working machine may include a pipe including: an outer pipe; an inner pipe inserted in the outer pipe; a pipe holder fixed to the outer pipe; and a stopper disposed inside the outer pipe. The pipe holder includes a wall part. The inner pipe includes a fixing hole having a longitudinal direction in a circumferential direction of an outer circumferential surface of the inner pipe. A rear surface of the fixing hole has a shape extending along a plane orthogonal to a front-rear direction. The stopper includes: an abutting part that abuts the wall part from behind when the inner pipe extends to a maximum length relative to the outer pipe; and a protruding part configured to fit in the fixing hole of the inner pipe. A rear surface of the protruding part has a shape extending along a plane parallel to the rear surface of the fixing hole.