Spindle Lock Monolithic Guide Rail for Drill Hammer
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Solution Overview
Problem
The existing spindle lock mechanisms for hand-held combination drill and chisel hammers are complex and costly to manufacture and assemble, with precise alignment of guide pins being difficult, which affects the operational safety and precision of the locking mechanism.
Innovation Solution
The integration of a monolithic guide rail arrangement directly into the gearbox housing eliminates the need for separate guide pins, providing improved positional precision and load-bearing capacity, and includes guide slots and a guide pin configured as an integral part of the gearbox housing to enhance the guiding action and reduce assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate guide pins are used for guiding the locking plate, then the locking mechanism can be assembled, but the assembly process becomes complex and costly with difficult precise alignment
Solution Approach 1:
The guide pins are integrated directly into the gearbox housing as a monolithic structure, eliminating the need for separate guide pin components. This merging of the guide function into the housing itself simplifies assembly by removing the need to separately attach guide pins, while maintaining the necessary guiding precision for the locking plate.
Solution Approach 2:
The gearbox housing serves multiple functions: it provides structural support, contains the gear mechanism, and simultaneously serves as the guide rail for the locking plate through its integrated guide pin structure. This multi-functionality reduces the total number of components and simplifies the overall assembly process.
2Manufacturing precision
If separate guide pins are used for guiding the locking plate, then the locking mechanism can function, but the positional precision and load-bearing capacity are reduced
Solution Approach 1:
By integrating the guide pins into the gearbox housing as a monolithic structure, the guide pins become an inherent part of the housing rather than separate attached components. This integration ensures precise positional alignment during manufacturing and significantly increases load-bearing capacity, as the guide structure is now formed from the same material and can be optimized as a unified component.
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 solution reduces manufacturing and assembly expenditures while improving operational safety and precision, ensuring the locking plate is accurately aligned and securely fixed, enhancing the overall performance of the spindle lock.
Implementation Method 1
a locking plate that is guided in guide means within the gearbox parallel to the axis of rotation
Implementation Method 2
the locking plate is pushed against a pretension of a spring onto the guide pins
Implementation Method 3
teeth that are pushed upon axial displacement into gaps between teeth of a pinion on the countershaft
Data Source
AI summary
A spindle lock of a hand-held combination drill and chisel hammer has a gearbox housing and a countershaft rotatably supported in the gearbox housing about an axis of rotation. A locking plate is provided for selectively releasing and locking a rotational movement of the countershaft. Guide elements are disposed in the gearbox housing, wherein the locking plate is displaceably guided on the guide elements in the gearbox housing in a direction parallel to the axis of rotation of the countershaft. The guide elements have a guide rail arrangement wherein a part of the guide rail arrangement is provided on the gearbox housing and is integral with the gearbox housing.