Jib Attachment Mechanism Using Luffing Cylinder

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Solution Overview

Problem

Conventional jib attachment/detachment mechanisms require a dedicated cylinder for mounting the jib support on the boom head, which is inefficient and costly.

Innovation Solution

A jib attachment/detachment mechanism that uses a first connecting portion on the boom head and a second connecting portion on the jib support, along with a locking and engaging mechanism, allowing the jib to be mounted and detached using a winch and cylinder for luffing, eliminating the need for a dedicated attachment/detachment cylinder.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a dedicated attachment/detachment cylinder is provided to mount the jib support on the boom head, then the jib can be securely attached, but the device complexity and cost increase

Engineering Contradiction:

Improvesecure attachment of jibVSAvoiddedicated cylinder provision

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cylinder for luffing the jib main body is made to serve dual purposes: both for luffing the jib and for attaching/detaching the jib support from the boom head. This eliminates the need for a separate dedicated attachment cylinder, reducing device complexity while maintaining secure attachment capability through the locking and engaging portions

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The attachment/detachment function is merged with the luffing function by using the same cylinder for both operations. The cylinder's extension and contraction movements are utilized for both positioning the jib during luffing and for engaging/disengaging the locking portions during attachment/detachment

Inventive Principle:

Principle #5Merging (Combining)

2Ease of manufacture

If a dedicated attachment/detachment cylinder is provided, then the attachment function is specialized, but the manufacturing cost increases

Engineering Contradiction:

Improvespecialized attachment functionVSAvoidnumber of cylinders

Core Design Contradiction:

Ease of manufactureVSQuantity of substance

Solution Approach 1:

By designing the luffing cylinder to perform both luffing and attachment functions, the number of cylinders required is reduced from two (one for luffing, one for attachment) to one, thereby reducing manufacturing costs and the quantity of components

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If the jib support is pulled up with a wire using a winch, then the jib can be positioned, but the wire tension may become excessive during rotation

Engineering Contradiction:

Improvejib positioningVSAvoidwire tension

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The locking portion and engaging portion are pre-configured in positions that guide the jib support during the attachment process. As the jib support is pulled up by the wire, these locking and engaging portions automatically engage at the appropriate moment, preventing excessive wire tension by guiding the rotation and positioning movements in advance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The locking portion and engaging portion act as intermediary elements that mediate between the wire pulling action and the jib support rotation. These elements guide the movement and prevent direct transmission of excessive force from the wire to the jib support during rotation

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9738497B2Jib attachment/detachment mechanism

Publication Date: 2017.08.22 TADANO LTD

AI summary

A jib attachment/detachment mechanism to mount a jib on a boom head includes a guide mechanism including a guide roller and a guide support configured to guide engaging portions of a jib support to positions of engagement with shaft pins of a boom head when the jib support is pulled up with a wire by using a winch and to prevent change of a state of the wire pulled up by the winch when the jib support is rotated around the shaft pins by contracting a cylinder.