Dual-Axis Actuator Mechanism for Cabin Door Latch Effort Reduction
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Solution Overview
Problem
Current door handle designs for construction machine cabins require a large effort to open due to low mechanical advantage and friction between latch components, making it difficult for operators to ingress and egress.
Innovation Solution
An actuator mechanism with two pivotably coupled actuators, each with engaging tips and arms, allows for reduced effort by providing mechanical advantage through rotation about different axes, enabling the latch to be released with forces applied to either an internal or external handle, thereby reducing the effort required to open the door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional handle design is used, then the door latch can be engaged and disengaged, but a large handle effort is required due to low mechanical advantage
Solution Approach 1:
The patent introduces a second actuator that operates on a different axis (second axis) than the primary actuator (first axis). This multi-dimensional approach allows force application from different directions, creating mechanical advantage through the interaction of two rotational movements rather than a single linear pull, thereby reducing the effort required on the handle.
Solution Approach 2:
The second actuator serves as an intermediary mechanism between the handle and the first actuator. When force is applied to the handle, the second actuator translates and amplifies this force through its arm engaging the first actuator, providing mechanical advantage before the force is applied to release the latch. This intermediary mechanism multiplies the input force.
2Ease of operation
If conventional latch components are used, then the door can be latched, but friction between components increases the required opening force
Solution Approach 1:
The patent extracts the friction problem by separating the force application point from the latch engagement point through the two-actuator mechanism. The handles and actuators are positioned to apply force at optimal points that minimize frictional resistance during the unlatching motion, rather than directly pulling on the latch components themselves.
Solution Approach 2:
By introducing rotation about a second axis through the second actuator, the patent creates a multi-dimensional force application that reduces the effect of friction. The combined rotational movements allow the mechanism to overcome friction more efficiently than a single-axis linear pull would permit.
3Ease of operation
If a single actuator is used, then the mechanism is simpler, but the mechanical advantage is insufficient to reduce handle effort
Solution Approach 1:
The patent segments the actuator mechanism into two distinct actuators, each with specific functions. The first actuator is responsible for direct engagement with the latch, while the second actuator provides force multiplication and directional control. This segmentation allows each component to be optimized for its specific role, achieving high mechanical advantage while maintaining reasonable complexity through functional specialization.
Solution Approach 2:
The two-actuator mechanism serves multiple functions: it provides mechanical advantage, controls the direction of force application, and can potentially operate with different handle configurations (internal or external handles). This multi-functionality justifies the increased complexity by delivering superior performance across multiple operational requirements.
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 actuator mechanism significantly reduces the handle effort needed to open the door by providing a mechanical advantage of up to 1:6 for the internal handle and 1:4 for the external handle, making it easier for operators to access the cabin.
Implementation Method 1
The actuator mechanism may include a first actuator and a second actuator. The first actuator can be pivotably coupled to a first support structure about a first axis. Moreover, the first actuator can include an engaging tip to release a door latch.
Implementation Method 2
The second actuator can be pivotably coupled to a second support structure about a second axis. The second axis may be different than the first axis. In response to the movement of the arm of the second actuator about the second axis, the first engagement of the first actuator can rotate about the first axis.
Data Source
AI summary
An actuator mechanism for a door latch is provided. The actuator mechanism may include a first actuator and a second actuator. The first actuator can be pivotably coupled to a first support structure about a first axis. Moreover, the first actuator can include an engaging tip, a first engagement and a second engagement. The second actuator can be pivotably coupled to a second support structure about a second axis. In response to the movement of the arm of the second actuator about the second axis, the first engagement of the first actuator can rotate about the first axis to move the engaging tip to release the door latch. Alternatively, in response to the movement of the second engagement of the first actuator, the second engagement of the first actuator can rotate about the first axis to move the engaging tip to release the door latch.