Monolithic Stepladder Securing Device with Self-Guiding Latch
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Solution Overview
Problem
Existing stepladders lack a simple and effective mechanism to secure themselves in the erected position, which can lead to collapse, and existing solutions require part exchange or are complex to retrofit.
Innovation Solution
A device comprising a rotatably mounted base body, a latch, and a spring, forming a monolith, where the latch cooperates with the crossbar on the support part to secure the stepladder, with the spring arranged between the platform and the main body, and the latch being guided only when the spring is tensioned, allowing for easy production and secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a securing device with multiple separate parts (bracket, spring, platform lifter) is used, then the ladder can be secured in the erected position, but the device complexity increases and retrofitting becomes difficult
Solution Approach 1:
The patent combines the bracket, spring, and platform lifter into a single integrated securing device that attaches to the ladder. This merging of multiple components into one unit reduces the number of parts, simplifies installation, and enables easy retrofitting while maintaining the full securing functionality in the erected position
Solution Approach 2:
The integrated securing device performs multiple functions simultaneously: it acts as a bracket for attachment, provides spring-based locking mechanism, and includes a platform lifter function. This multi-functionality eliminates the need for separate components while achieving the same securing effect
2Reliability
If a securing device requiring part replacement (bracket with circular holes replaced by bracket with slots) is implemented, then the securing function is achieved, but the ease of manufacture and retrofitting deteriorates
Solution Approach 1:
Instead of replacing the bracket with a different design, the patent integrates the bracket functionality directly into the securing device unit. The device attaches to the existing circular-hole bracket without requiring any modifications to the original ladder structure, making retrofitting trivial
Solution Approach 2:
The securing device is designed to work with the existing bracket configuration from the outset. By preparing the device to interface with standard circular-hole brackets, the invention eliminates the need for any preliminary modification work on the ladder
3Reliability
If a securing device with guided latch movement is used, then the locking reliability improves, but the device complexity and manufacturing difficulty increases
Solution Approach 1:
The latch is designed to be self-guiding through its own geometry and the interaction surfaces with the platform lifter. The latch automatically follows the correct path during engagement without requiring external guide rails or complex guidance mechanisms, simplifying the overall device structure
Solution Approach 2:
The patent provides guidance only in the specific local area where the spring is tensioned and the latch engages. The latch is not guided throughout its entire range of motion, but only in the critical locking zone, reducing the overall complexity while maintaining reliability where needed
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 provides a secure and easy-to-retrofit mechanism to prevent stepladder collapse, using a minimal number of parts and allowing for automatic locking when erected, with manual unlocking capability, enhancing safety and convenience.
Implementation Method 1
a spring arranged between the platform and the base body... which acts to tension the latch against the crossbar on the support part
Implementation Method 2
a rotatably mounted base body, a latch... wherein the latch is guided only when the spring is tensioned
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a stepladder with a device (1) for securing a stepladder in an erected position, wherein the device (1) comprises a base body (10), a latch (12) which is displaceable relative to the base body, and a spring (11) which is arranged between the base body (10) and the latch (12), and wherein the device is a monolith.