Forklift Parallelogram Linkage Eliminates Fork Tilt
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional forklifts with limited vertical reach struggle to access loads on both sides of a truck, leading to increased complexity and weight due to tilting issues when extending forks, requiring additional control mechanisms and weight to compensate.
Innovation Solution
A forklift arrangement featuring a parallelogram linkage with a stabilizing link that maintains fork support member orientation relative to the mast, eliminating tilting and simplifying operation by using a linkage system with parallel first and second links and a stabilizing link connected to a fixed point on the mast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic cylinder is used as the third link to compensate for fork tilting, then fork tilt control is improved, but device complexity and weight increase
Solution Approach 1:
The patent removes the hydraulic cylinder (third link) from the system entirely. Instead of using an active compensation mechanism, the design relies on the passive geometric constraint of the parallelogram linkage formed by the first and second links of equal length, which naturally maintains fork orientation without requiring additional tilt control components.
Solution Approach 2:
The parallelogram linkage structure is self-compensating for tilt. As the carriage moves along the mast, the geometry of the equal-length links automatically maintains the forks in a horizontal position relative to the ground, eliminating the need for external control mechanisms.
2Reliability
If a hydraulic cylinder is used as the third link to compensate for fork tilting, then fork tilt control is improved, but weight increases
Solution Approach 1:
The patent removes the hydraulic cylinder (third link) from the system entirely. Instead of using an active compensation mechanism, the design relies on the passive geometric constraint of the parallelogram linkage formed by the first and second links of equal length, which naturally maintains fork orientation without requiring additional tilt control components.
3Length of moving object
If the carriage is moved to extend forks reach, then extended reach is achieved, but fork tilting occurs
Solution Approach 1:
The patent uses symmetric equal-length links (first and second links) to create a parallelogram mechanism that maintains parallelism. This symmetry ensures that as the carriage moves, the forks extend horizontally without tilting, as the geometric constraints force the links to remain parallel throughout the range of motion.
4Reliability
If additional tilt control mechanisms are added, then fork tilt control is improved, but operational complexity increases
Solution Approach 1:
The parallelogram linkage structure is self-compensating for tilt. As the carriage moves along the mast, the geometry of the equal-length links automatically maintains the forks in a horizontal position relative to the ground, eliminating the need for external control mechanisms.
Data Source
AI summary
A forklift arrangement is described which comprises a mast (12), a carriage (18) movable along the mast (12), a first link (36) interconnecting the carriage (18) and a fork support member (24), a second link (38) interconnecting the carriage (18) and the fork support member (24) and extending substantially parallel to the first link (36) throughout the range of movement of the fork support member (24) relative to the mast (12), and a third, stabilizing link (44) interconnecting the first link (36) and a point fixed relative to the mast (12).