Rotating Dust Container Connector for Hand-Guided Machine Tools
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Solution Overview
Problem
The existing hand-guided grinders face difficulty in removing the dust collection container due to high friction between the sealing ring and the container, requiring significant manual force to detach it, leading to abrupt release and potential damage.
Innovation Solution
The design incorporates a rotating mechanism with a support point that travels axially and circumferentially, allowing the dust collection container to be released automatically by rotating it around its axis, eliminating the need for manual axial force, and includes oblique or three-dimensional contact surfaces and conical/cylindrical connectors for secure attachment and easy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dust collection container is connected to the housing using a sealing ring and axial sliding connection, then the sealing and attachment are secure, but the removal requires excessive manual force and causes abrupt release
Solution Approach 1:
The patent introduces a rotational dimension to the otherwise axial connection. The container connector is designed to rotate around the longitudinal axis, which triggers the support point to travel along the oblique support surface, converting rotational motion into axial extraction motion. This multi-dimensional approach allows easy removal through simple rotation while maintaining secure axial attachment during operation.
Solution Approach 2:
The support point acting on the oblique support surface serves as an intermediary mechanism. When the container rotates, this support point mediates the conversion of rotational motion into axial extraction force, eliminating the need for direct axial pulling force and preventing abrupt release by controlling the release through the geometric relationship between the support point and oblique surface.
2Reliability
If a sealing ring is used to seal the connection between the dust collection container and housing, then sealing is effective, but friction increases making removal difficult
Solution Approach 1:
The patent extracts the sealing function from the load-bearing connection structure. The sealing ring remains in place to provide effective sealing, but the removal mechanism is separated through the support point and oblique support surface system, which provides a mechanical advantage for extraction without increasing friction on the sealing interface.
3Device complexity
If the container connector is designed for axial sliding connection, then the connection is simple, but the release requires manual axial force and is not controlled
Solution Approach 1:
The patent transforms the static axial sliding connection into a dynamic system where rotation around the longitudinal axis activates the support point movement along the oblique surface. This dynamic mechanism provides controlled release through the geometric relationship between rotational motion and axial extraction, eliminating the need for uncontrolled manual axial force while maintaining connection simplicity.
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
Enables controlled and effortless removal of the dust collection container, reducing the risk of damage and operator strain, while maintaining secure attachment during operation.
Implementation Method 1
When the dust collection container is rotated about the longitudinal axis of the container connector, the support point travels in the axial direction—relative to the longitudinal axis of the container connector—and, expediently, in the circumferential direction as well. This superposed rotary and axial motion of the contact point represents a combination of a rotary and translational displacement motion
Implementation Method 2
the container connector and the blow-out connector are located coaxially with one another... the wall of the dust collection container and an associated wall of the housing are in contact with each other via at least one common support point that has radial clearance from the longitudinal axis
Data Source
AI summary
A hand-held machine tool has an electric drive motor (3), arranged in a housing (2), for driving a tool (5), wherein a dust collecting container (7) is connected to the housing and has in its wall a container connector (8), which can be pushed axially onto a blow-out connector (6) in the housing. When the connection is disconnected, the wall (11) of the dust collecting container and an assigned wall (15) on the housing are in contact by way of at least one common supporting point, wherein the supporting point is displaced in the axial direction when the dust collecting container rotates about a longitudinal axis (9) of the container connector.