Pivotable Guide Device for Jigsaw Lifting Element
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Solution Overview
Problem
Existing hand-held power tools, such as jigsaws, face challenges in reducing installation height and size while maintaining effective guidance of lifting elements, which affects the tool's overall size and weight.
Innovation Solution
A guide device with a pivotably mounted guide unit about a pendulum axis, featuring a plain bearing unit and a sintered bushing, allows for a structurally simple and space-saving design, enabling the separation of the pendulum axis and lifting element, and includes a connecting element to prevent twisting, thereby optimizing the movement and attachment of the lifting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the guide unit is integrated with the lifting element in conventional designs, then the structural guidance function is maintained, but the installation height and size of the guide device increase
Solution Approach 1:
The guide device is segmented into separate functional components: the guide unit with pendulum axis is separated from the lifting element, allowing independent optimization of each component. The guide unit can be pivotably mounted on the housing while the lifting element maintains its guidance function through bearing units, reducing overall installation height.
Solution Approach 2:
The pendulum axis is oriented perpendicular to the stroke direction, utilizing a different spatial dimension for the guidance mechanism. This perpendicular mounting arrangement allows the guide unit to occupy horizontal space rather than vertical space, thereby reducing installation height in the vertical dimension.
2Reliability
If the guide device is designed with larger dimensions for effective guidance, then the guidance stability is improved, but the tool's overall size and weight increase
Solution Approach 1:
The bearing units utilize material and structural parameter optimizations to achieve effective guidance with reduced dimensions. By changing the bearing characteristics and contact surface parameters, the guide device maintains stability while minimizing size and weight.
Solution Approach 2:
Sintered bushings are employed as composite or specialized materials in the bearing units, providing high strength-to-weight ratio and effective guidance functionality with minimal mass, thereby reducing overall tool weight while maintaining guidance stability.
3Weight of moving object
If the lifting element is designed to be lightweight, then the tool's overall weight is reduced, but the force distribution and bearing capacity are compromised
Solution Approach 1:
The bearing units are designed with optimized contact surface parameters and material properties that enable lightweight construction while maintaining adequate bearing capacity. The parameter optimization allows the lifting element to be lighter without compromising force distribution.
Solution Approach 2:
Sintered bushings and specialized bearing materials are used to achieve high strength-to-weight ratio components, enabling the lifting element and guide device to be lightweight while maintaining sufficient bearing capacity and force distribution.
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
This configuration reduces the installation height and size of the guiding device, enhances force distribution, and maintains a low weight, resulting in improved sawing performance and a cost-effective, lightweight lifting element.
Implementation Method 1
The guide unit has at least one running surface... The running surface can alternatively and/or additionally be designed to directly absorb the bearing forces of the first bearing unit
Data Source
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AI summary
The device (10a) has a guide unit for guiding a lift element (16a) in a lifting direction (20a). The guide unit is rotatably supported around a pendulum axle (22a). The lift element is guided along the guide unit using a bearing unit (24a). The guide unit exhibits a bearing surface (26a), and the bearing unit exhibits a connection element (16a) that is aligned perpendicular to the lifting direction. The connection element exhibits two contact elements (30a) corresponding with the guide unit.