Boom Extension Wire Locking Structure for Mobile Crane
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Solution Overview
Problem
The existing boom-extending wire mechanisms for mobile cranes face challenges in reducing the number of wire terminal metal fittings and optimizing the installation space for equalizer sheaves, which are bulky.
Innovation Solution
The proposed boom-extending wire locking structure incorporates multiple pairs of stretched parts between boom members, with a wire locking tool featuring fixing pieces and wire locking parts arranged orthogonally to the boom's extension direction, allowing the locking wire to be wound around an arc-shaped groove, increasing the thickness between grooves and enabling more wire locking parts without increasing the tool's thickness, thus saving installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple equalizer sheaves are provided for one boom member to reduce the number of wire terminal metal fittings, then the manufacturing cost is reduced, but the installation space becomes insufficient due to the large external shape of the equalizer sheaves
Solution Approach 1:
The wire locking tool is segmented into multiple wire locking parts (first, second, third, and fourth wire locking parts) arranged in series along the wire direction. Each segment handles a portion of the wire locking function, allowing the overall structure to fit within limited space while still achieving the goal of reducing wire terminal metal fittings through multiple wire locking points
Solution Approach 2:
The wire locking parts are arranged not only in the wire direction but also in the thickness direction of the boom member, utilizing three-dimensional space efficiently. This multi-dimensional arrangement allows multiple wire locking parts to be integrated without proportionally increasing the tool's thickness, resolving the space constraint
2Quantity of substance
If the thickness of the wire locking tool is increased to accommodate more wire locking parts, then more wire locking parts can be integrated, but the installation space is increased
Solution Approach 1:
The wire locking tool is divided into multiple discrete wire locking parts (first through fourth wire locking parts) that are arranged in series along the wire direction. This segmentation allows the wire locking function to be distributed across multiple smaller units rather than requiring a single thick component, thereby increasing the number of wire locking parts without proportionally increasing the tool's thickness
Solution Approach 2:
The wire locking parts are arranged in multiple directions including the wire direction and the thickness direction of the boom member. This multi-dimensional arrangement optimizes space utilization by distributing wire locking parts across available dimensions rather than concentrating them in a single thickness direction, allowing more wire locking parts to be integrated within limited installation space
Data Source
Figure 1A~1B
Figure 2
Figure 3~5
AI summary
The present invention provides a wire locking structure which is for a boom extension and is capable of reducing the number of wire terminal fittings used and saving a space for a connection part with a boom member. A second connection fitting (44) has a pair of fixing pieces (44a) provided on both sides of an extendable boom (10) in the width direction and fixed to a force boom (14), and wire locking parts (44c) provided between the pair of fixing pieces (44a) such that a locking part (41e) of a force boom extension wire (41) is wound onto a groove (44e) formed along an arcuate outer circumference part. The wire locking parts (44c) on the top and bottom sides of the second connection fitting (44) are arranged in parallel in the direction of the arcuate center axis between the pair of fixing pieces (44a), and the center axis (C1) of the upper wire locking part (44c) is arranged a predetermined distance (S) apart from the center axis (C2) of the lower wire locking part (44c) in the width direction of the extendable boom (10).