Fork Blade Locking Mechanism for Forklift Extensions
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Solution Overview
Problem
Existing load-carrying devices for trucks, such as fork extensions for forklifts, face issues with locking mechanisms that are either cumbersome to assemble, prone to damage, or fail to securely lock the fork leaf extension, leading to unintentional axial movement and potential damage during operation.
Innovation Solution
A circumferential groove in the fork leaf bore for radially movable locking means that positively locks the bolt in place, combined with a spring-loaded unlocking bolt and visual indicators for easy handling and secure locking, preventing unintentional axial displacement and ensuring the bolt remains locked until fully actuated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a loosely inserted bolt is used in the bores, then assembly is simple and quick, but the bolt can jump out when the fork blade extension hits a load or obstacle, making locking ineffective
Solution Approach 1:
A retaining ring is introduced as an intermediary element between the bolt and the bores. The retaining ring has legs that engage with the bolt and a body that engages with the bore, creating a positive locking connection. This mediator prevents the bolt from jumping out while maintaining simple assembly through a snap-fit mechanism.
2Reliability
If a thread and grub screw are provided, then locking is secure, but assembly and disassembly become cumbersome and time-consuming, requiring tools that can be damaged in rough operation
Solution Approach 1:
The threading function is extracted from the bolt itself and transferred to the retaining ring structure. The retaining ring provides the threading engagement with the bore while the bolt remains a simple smooth pin. This separation allows the bolt to be quickly inserted and removed without threading operations, while security is maintained through the retaining ring's engagement with the bore threads.
3Reliability
If pressure pins are embedded in the fork leaf, then locking is secure, but the pins get dirty in rough operation and jam in the bores, failing to lock the fork blade extension
Solution Approach 1:
The locking function is segmented into two separate components: the bolt and the retaining ring. The bolt is a smooth pin that does not contact the bore surface, so it remains clean. The retaining ring contacts the bore and handles the contamination, but its structure with legs engaging the bolt provides the locking function. This segmentation protects the critical locking interface from contamination.
4Ease of operation
If the bolt can be moved vertically in the bores when unlocking, then the unlocking mechanism works, but unintentional axial displacement can occur during operation
Solution Approach 1:
The system uses dynamic control of bolt movement through the spring-loaded retaining ring. The spring allows the retaining ring to flex and the bolt to move vertically only when sufficient force is applied to compress the spring and disengage the legs from the bore. During normal operation, the spring force keeps the bolt firmly locked in position. This dynamic mechanism provides both unlocking functionality and positional stability.
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 cost-effective, secure, and easy-to-use locking mechanism that prevents unintentional axial movement of the bolt, ensuring stability and safety during load handling, even under impact, while allowing for simple and safe insertion and removal.
Implementation Method 1
a spring-loaded unlocking bolt, which is guided in the bolt and is acted upon in the opposite direction to the removal direction of the bolt
Data Source
Figure 1
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Figure 3
AI summary
The load suspension device comprises a vertical fork shank, a fork blade (4) connected by a fork bend, and a fork hook, which is arranged at the fork shank for fastening the load suspension device on a fork carrier of the truck. A borehole (7) is provided in the fork blade, which has a recess, particularly a circumferential groove (10) for receiving a locking unit (12) that is moved radially from a bolt (11).