Rear Jib Backstop Spacer Locking to Prevent Transport Damage
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Solution Overview
Problem
The spacer in existing crane backstops is prone to damage due to contact with peripheral members during disassembly and transportation, leading to instability in supporting the strut and jib.
Innovation Solution
A backstop design featuring an outer cylinder, inner cylinder, spacer, spacer holder, and lock mechanism that allows the spacer to swing and fit onto the inner cylinder, preventing contraction and supporting the strut, with a lock mechanism to stabilize the spacer in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spacer is fixed in position during disassembly and transportation, then the spacer may contact peripheral members and suffer damage, but if the spacer is left free, it cannot provide stable support during crane operations
Solution Approach 1:
The spacer holder is designed to rotate about a rotation central axis, allowing the spacer to dynamically change its position between a working state (where it supports the strut) and a storage state (where it is retracted to avoid contact with peripheral members). This dynamic adjustment resolves the contradiction between needing stable support during operation and avoiding damage during disassembly and transportation.
2Stability of the object's composition
If the spacer is positioned to support the strut during operations, then the strut is stably supported, but the spacer may contact peripheral members during disassembly and transportation causing damage
Solution Approach 1:
The rotatable spacer holder enables the spacer to transition between two stable positions: during crane operations, the spacer is positioned to support the strut and maintain backstop stability; during disassembly and transportation, the spacer is retracted to a storage position where it cannot contact peripheral members, thus preserving its integrity.
3Reliability
If the spacer is made robust to prevent damage, then the spacer can withstand contact during disassembly and transportation, but the device complexity and size increase
Solution Approach 1:
Rather than making the spacer more robust to withstand contact, the invention uses a rotatable holder to dynamically position the spacer, avoiding contact during vulnerable periods (disassembly and transportation). This approach maintains spacer simplicity while preventing damage through motion control rather than structural reinforcement.
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
Prevents spacer damage and ensures stable support for the strut and jib, maintaining structural integrity during crane operations and transportation.
Implementation Method 1
The spacer holder supports the spacer swingably about a swing central axis perpendicularly intersecting the axial direction. The spacer holder supports the spacer in such a manner that the spacer swings about the swing central axis under the weight of the spacer
Implementation Method 2
The lock mechanism is shiftable between a locking state and an unlocking state. The locking state is a state of locking the spacer to keep the spacer from swinging about the swing central axis
Data Source
AI summary
A backstop to prevent contact between a spacer and a peripheral member includes a rear jib backstop for a crane, having an outer cylinder, an inner cylinder, a spacer, a spacer holder and a lock mechanism. The spacer holder supports the spacer pivotally and swingably about an axis thereof and allows the spacer to fit on the inner cylinder, to keep the rear jib backstop from contracting in accordance with a change in a posture of the rear jib backstop when a boom rises. The lock mechanism enables locking of the spacer in such a manner as to keep the spacer from swinging about a swing central axis in a state where the spacer is located away from an outer surface of the inner cylinder.