Fixed-Handle Machine Control Grip for Stable Multi-Function Input
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Solution Overview
Problem
Existing manual control devices for machines, such as skid-steer loaders and forklifts, often fail to provide adequate operator stability during abrupt movements, leading to balance issues and compromised control precision, especially in environments with debris or high vibrations, and are limited in their ability to control multiple functions effectively.
Innovation Solution
A manual input device with an elongate handle portion rigidly connected to the machine frame, allowing a four-finger grip with thumbs and fingertips to control primary functions, and additional control surfaces accessible by the thumbs and index fingers for secondary inputs, minimizing inadvertent control inputs and enhancing stability and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional joystick with multi-axial pivoting mechanism is used, then the operator can control machine functions, but the operator loses balance and control precision during abrupt machine movements
Solution Approach 1:
Instead of allowing the entire handle to pivot relative to the base (traditional joystick), this invention inverts the approach by making the control elements (fingers, thumb) movable relative to a stable handle grip. The handle remains fixed to the base, providing stability, while the control elements move to provide input signals.
Solution Approach 2:
The control device is segmented into distinct functional zones: the handle portion for stabilization (grasped by fingers), the thumb portion for primary control inputs, and the finger-operated controls for secondary inputs. This segmentation allows each part to perform its specific function optimally without interfering with others.
2Reliability
If operator restraints such as belts and handles are provided for stability, then the operator can stabilize themselves, but the operator's ability to effectively control the machine is compromised
Solution Approach 1:
The invention merges the stabilization function and control input function into a single integrated device. The handle portion serves both as a stabilization grip and as the base for control inputs, eliminating the need for separate restraints and controls.
Solution Approach 2:
The handle grip serves multiple functions simultaneously: it provides mechanical support for operator stabilization, serves as a reference frame for control inputs, and supports multiple control elements (thumb portion, finger controls) for versatile machine operation.
3Reliability
If a fingertip operated grip similar to trackball is used, then the user's hand is stabilized, but the device provides limited control opportunities and is susceptible to contamination
Solution Approach 1:
The invention adds spatial dimensionality to control inputs by positioning control elements in multiple locations and orientations around the handle grip. Control surfaces are arranged on different faces and at different angles, allowing inputs from thumb, index finger, and other fingers simultaneously or sequentially.
4Ease of operation
If control surfaces are positioned for thumb and index finger access, then multiple functions can be controlled with reduced inadvertent inputs, but the device complexity increases
Solution Approach 1:
Different regions of the control device have specialized control surfaces optimized for specific fingers. The thumb portion has control surfaces accessible by the thumb, while other areas have surfaces positioned for index and middle finger access. Each region is tailored to its intended user interaction.
Data Source
AI summary
A manual input device for a machine includes an elongate handle rigidly connected at one end to a frame of a machine and configured to be engaged by a hand of an operator, and a control portion connected to a free end of the elongate handle. The control portion includes a first plurality of control surfaces and a second plurality of control surfaces associated with sensors providing control signals. The first plurality of control surfaces is positioned and oriented relative to the handle portion so it is accessible for interaction by a thumb of the hand of the operator, and the second plurality of control surfaces is positioned and oriented relative to the handle portion so it is accessible for interaction by an index finger of the hand of the operator.