Telescopic Rod Spring-Pin Mechanism for Precise Length Adjustment
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Solution Overview
Problem
Existing telescopic rods lack a simple and precise mechanism for adjusting length, as previous solutions are complex and not universally adaptable to different tube or spring diameters, limiting their application.
Innovation Solution
A telescopic rod design featuring an outer and inner tube with a coil spring, where a pin secured to the inner tube crosses the spring's active portion, allowing axial rotation to adjust the distance between the tubes, and a blocking mechanism to immobilize spring turns, enabling precise and universal length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an elongated part with a spiral seat is used to introduce the spring, then the spring can be driven inside the inner tube, but the design becomes complex and requires specific diameter matching between spring and tube
Solution Approach 1:
The patent removes the complex elongated part with spiral seat from the design. Instead, the spring is directly introduced through the opening in the cap, eliminating the intermediary elongated component and simplifying the overall structure while maintaining the spring introduction function
Solution Approach 2:
The cap with opening serves multiple functions: it allows spring introduction, acts as a stop for the spring, and provides a universal interface that accommodates different spring diameters without requiring specific diameter matching, making the adjustment mechanism universally adaptable
2Ease of operation
If a pin integral with the internal tubular section is used for spring support, then the spring can be supported, but precise adjustment of the rod length is not achieved
Solution Approach 1:
The patent transforms the static pin support into a dynamic adjustment system where the spring can be screwed onto or off the pin by rotating the inner tube relative to the outer tube. This dynamic interaction allows continuous length adjustment while maintaining spring support functionality
Solution Approach 2:
The patent replaces the integral pin support with a threaded engagement system where the pin serves as a screw thread interface. The spring screws onto the pin through rotational motion, converting the mechanical support function into a precision adjustment mechanism through thread engagement
3Ease of manufacture
If the spring diameter is made less than the inner tube diameter, then the spring can be introduced into the elongated part, but the system becomes specific to a single dimension and not universally adaptable
Solution Approach 1:
The cap with opening provides a universal introduction path for springs of various diameters. The opening in the cap serves as a universal interface that accommodates different spring sizes without requiring the spring diameter to be specifically matched to the inner tube diameter, enabling universal adaptability across different configurations
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 design allows for easy and precise adjustment of the rod's length, accommodating various diameters and applications, with a simplified manufacturing process and universal adaptability.
Implementation Method 1
a coil spring positioned at least inside the outer tube, and which cooperates in bearing by one of its ends with said inner tube, while its other end is immobilized in the outer tube
Implementation Method 2
said spring comprises at least one active portion of distance D connecting the inner tube with the outer tube, characterized in that it comprises a pin secured to said inner tube through which said support is made, and which is transversely connected to said inner tube and crosses transversely one of the turns of the active portion of the spring, so that the axial rotation of said spring generates its screwing or unscrewing on said pin
Data Source
Figure 1~2
Figure 3~4
AI summary
Telescopic rod (1) of adjustable length comprising: - an outer tube (2) and an inner tube (3), said inner tube (3) sliding, via its free end (32), in said outer tube ( 2); - a spring (4) with helical coils positioned at least inside the outer tube (2), and which cooperates in support by one of its ends (42) with said inner tube (3), while its other end (43) is immobilized in the outer tube (2), - and where said spring (4) comprises at least one active portion (41) of distance D connecting the inner tube (3) with the outer tube (2), characterized in that it comprises a pin (6) integral with said internal tube (3) through which said support is made, and which is transversely connected to said internal tube (3) and passes transversely through one of the turns of the active portion ( 41) of the spring (4), so that the axial rotation of the said spring (4) generates its screwing or unscrewing on the said pin (6), and makes it possible to vary the distance D of the said active portion (41), distance D which is delimited by the turn (411) through which said pin (6) passes, and by the immobilized turn (412) of the outer tube (2) furthest close to said pin (6).