Telescoping Handle Locking Mechanism Design
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Solution Overview
Problem
Existing locking systems for telescoping handle assemblies, such as those used in railroad brakesticks, suffer from structural integrity issues, jamming, and failure to securely hold the inner rod in place, leading to breakage and operational difficulties.
Innovation Solution
A novel locking mechanism featuring an outer housing with a key channel and lock groove, combined with a rotatable collar and shaft key system, which prevents longitudinal movement by engaging the shaft key into the lock groove, enhancing structural rigidity and secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical devices grip lateral grooves cut into the inner rod, then the locking mechanism can hold the rod in place, but the grooves weaken the structural integrity of the inner rod causing it to break
Solution Approach 1:
The patent removes the lateral grooves from the inner rod and transfers the locking engagement feature to the outer tube through protrusions. This extraction eliminates the structural weakness caused by grooves while maintaining the locking function through the outer tube's protrusions engaging with the inner rod.
Solution Approach 2:
Instead of cutting grooves into the inner rod to enable locking, the patent inverts the approach by adding protrusions to the outer tube that engage with the inner rod. This reversal places the structural stress on the stronger outer tube rather than weakening the inner rod.
2Reliability
If internal camlocks or spring loaded ball plungers are used to secure the inner rod, then the locking mechanism can hold the rod, but these mechanisms are difficult to operate or inadequate to securely hold the rod
Solution Approach 1:
The patent removes complex internal locking mechanisms such as camlocks and spring-loaded ball plungers, replacing them with a simple protrusion-engagement system. This extraction eliminates operational difficulty while maintaining secure locking through the direct mechanical engagement of outer tube protrusions with the inner rod.
3Power
If the inner rod is subjected to significant tension during brake operation, then the tool can effectively tighten or loosen brake wheels, but the inner rod breaks or is pulled out of the outer tube
Solution Approach 1:
The patent removes the vulnerable inner rod grooves and transfers the load-bearing locking function to the outer tube protrusions. This extraction protects the inner rod from breaking under tension while maintaining the tool's braking power through the strengthened outer tube engagement system.
Data Source
AI summary
A telescoping handle device may include an outer housing which may be slidably coupled to a shaft. The outer housing may have an elongated side wall, and the side wall may terminate in a first end and a second end. A cavity may be formed within the side wall, and the cavity may include a key channel and a lock groove. The shaft may be movable within the cavity, and the shaft may have an upper end and a lower end. A shaft key may be coupled to the shaft, and the shaft key may be slidably engaged within the key channel so that the shaft key is slidable between the first end and the second end. The shaft key may be rotatable out of the key channel and into the lock groove to prevent the shaft key from being slidable between the first end and the second end.