Telescopic Goods Rod With Internal Rack and Centered Lock Catch
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Solution Overview
Problem
Existing extensible rods with locking handles for goods are large, heavy, inconvenient to operate, costly to produce, and have poor stability and locking reliability due to the externally arranged rack with one cantilevered end.
Innovation Solution
The extensible rod with locking handle features a telescopically connected outer and inner tube, a rack fixed on the inner tube, a hollow seat with an operating assembly and lock catch assembly, where the rack and gear are stamped parts for reduced cost and improved mobility, and the lock catch is centered for uniform stress and enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rack is arranged externally with one end cantilevered and higher than the outer tube side, then the locking function is achieved, but the mobility is poor resulting in large size, heavy weight and inconvenience to operate
Solution Approach 1:
The rack is installed inside the outer tube rather than externally, with the rack extending along the inner tube. This nested arrangement reduces the overall size and weight of the device while maintaining the locking function through the gear-rack meshing mechanism.
Solution Approach 2:
The rack is repositioned from a cantilevered external arrangement to an internal linear arrangement parallel to the inner tube. This dimensional reorganization improves mobility and operability while preserving the mechanical advantage of the gear-rack system for reliable locking.
2Reliability
If the rack is arranged externally with one end cantilevered, then the locking function is achieved, but the device becomes large and heavy
Solution Approach 1:
The rack is installed inside the outer tube rather than externally, with the rack extending along the inner tube. This nested arrangement reduces the overall size and weight of the device while maintaining the locking function through the gear-rack meshing mechanism.
3Reliability
If the lock catch and button are arranged on a side face of the rod, then the locking function is achieved, but the stress is unilateral affecting the strength and easily touched by mistake affecting locking reliability
Solution Approach 1:
The lock catch is positioned asymmetrically at the bottom of the hollow seat rather than on the side face, creating a more balanced stress distribution. The button remains accessible on the side while the locking mechanism's weight and force are centered, improving overall structural strength.
Solution Approach 2:
Instead of placing the lock catch on the side face where it is easily touched, the design inverts the arrangement by positioning it at the bottom of the hollow seat. This inversion protects the locking mechanism from accidental activation while maintaining reliable locking function.
4Strength
If the toothed handle and rack are made of cast steel, then the strength is sufficient, but the production process is high in cost and detrimental to environmental protection
Solution Approach 1:
The material specification is changed from cast steel to stamped steel parts. This parameter change in material processing method reduces production cost and environmental impact while maintaining sufficient strength through optimized stamped part design and heat treatment processes.
Solution Approach 2:
The design accepts using less durable but cheaper stamped steel parts instead of expensive cast steel. The stamped parts are designed to be replaceable if needed, balancing cost-effectiveness with functional requirements for the handle and rack components.
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
This design results in a more stable, reliable, and cost-effective extensible rod with improved mobility and reduced risk of damage or accidental unlocking, enhancing overall safety and ease of use.
Implementation Method 1
an elastic member; wherein the lock catch is pivoted to the hollow seat through a first pivot member; when the lock pin locks the lock catch, the handle is in a locked state and is unable to rotate... the elastic member urges the lock catch towards the locked state and positions the lock catch inside the hollow seat
Implementation Method 2
the operating assembly comprises a rotatable handle and a gear with a plurality of teeth connected to the handle, the first end of the outer tube has an opening on a top surface of the outer tube, the teeth pass through the opening to engage with the rack on the inner tube, so that the handle and the gear are capable of driving the inner tube to extend out from or retract into the outer tube
Implementation Method 3
a lock pin mounted on the handle capable of locking or unlocking the lock catch
Implementation Method 4
the lock catch is pivoted to the hollow seat through a first pivot member
Data Source
AI summary
An extensible rod with locking handle for goods comprises an inner tube, an outer tube, a rack, a hollow seat, an operating assembly and a lock catch assembly. The rack is disposed on the inner tube inside the outer tube, the operating assembly comprising a rotatable handle and a gear with a plurality of teeth connected to the handle is used for adjusting extension length of the inner tube, the teeth on the gear pass through the outer tube to engage with the rack on the inner tube, so that the handle and the gear are capable of driving the inner tube to extend out from or retract into the outer tube, the lock catch assembly is capable of locking or unlocking the handle. Under this design, the stability is high, and it is difficult to damage. Meanwhile, the defects of the existing extensible rod with locking handle for goods are effectively solved.