Crane Hook Lock Pin Positioning for Workability
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Solution Overview
Problem
Existing crane hooks face issues with the separation of lock pin attachment and wire detachment positions, leading to reduced workability, especially with larger hooks, as the lock pin in previous designs abuts at a position far from the rotation tip, causing operational inefficiencies.
Innovation Solution
A crane hook design featuring a rotation member with through-holes that allow a regulating member to abut on the hook body, regulating rotation against a biasing force, and an engagement member that maintains the engaged attitude to prevent removal, facilitating smooth detachment and attachment of the wire and lock pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock pin is positioned at the farthest point from the rotation tip to prevent rotation, then the rotation prevention function is improved, but the workability and operational efficiency deteriorate due to separation between lock pin attachment and wire detachment positions
Solution Approach 1:
The rotation member is divided into multiple sections with different through-holes positioned at various distances from the rotation tip. The first through-hole positions the regulating member close to the abutment portion for good workability, while the second through-hole positions it farther away for enhanced rotation prevention, creating a segmented approach to solving both requirements
Solution Approach 2:
The patent implements a nested structure where multiple through-holes are arranged concentrically around the rotation axis. The regulating member can be inserted through different holes depending on the operational state, with the holes nested at different radial distances from the rotation tip, allowing the system to adapt between workability and rotation prevention modes
2Ease of operation
If the regulating member attachment position is close to the abutment portion for smooth operation, then the ease of operation is improved, but the rotation prevention capability deteriorates compared to positioning at the farthest point
Solution Approach 1:
The system dynamically adapts the regulating member position based on operational requirements. During normal operation, the regulating member is positioned through the first through-hole close to the abutment portion for smooth wire detachment and attachment. When rotation prevention is needed, it can be repositioned through the second through-hole farther from the rotation tip, creating a dynamic rather than static configuration
3Quantity of substance
If the hook size is increased for larger lifting capacity, then the lifting capacity is improved, but the workability deteriorates more remarkably due to increased separation distance between lock pin and wire attachment positions
Solution Approach 1:
The patent applies local quality by creating different functional zones on the rotation member. The first through-hole is positioned in a zone close to the abutment portion where local geometry favors smooth operation, while the second through-hole is positioned in a zone farther from the rotation tip where local geometry enhances rotation prevention. This allows each local region to optimize for its specific function regardless of overall hook size
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 effectively prevents wire removal from the hook while allowing for easy and efficient detachment and attachment operations, maintaining stable rotation regulation and preventing loss of the regulating member.
Implementation Method 1
a biasing member biasing the rotation member in a direction
Implementation Method 2
The regulating member abuts on a curved inner surface of the hook body when the regulating member is passed through the first through-hole to regulate rotation of the rotation member
Data Source
AI summary
A hook has a hook body which has an attachment portion to be attached to a rope at a base end portion and which is curved in an L-shaped from the base end portion to a tip end portion, a latching tool which is rotatably supported by the hook body and which is brought into contact with and separated from a curved inner surface of the hook body on the tip end portion side of the hook body relative to a rotation center, a biasing member biasing the latching tool in a direction where the latching tool is caused to abut on the hook body, and a lock pin which is detachable from and attachable to the latching tool between the rotation center and a rotation tip and which abuts on the curved inner surface of the hook body when the lock pin is attached to the latching tool to regulate the rotation of the latching tool against biasing force of the biasing member.