Handheld Tool Battery Compartment With Vibration-Stable Retention
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Solution Overview
Problem
Battery-operated tools experience undesired relative movements between the battery compartment and the battery due to vibrations during operation, leading to instability and potential misalignment.
Innovation Solution
A hand-held work apparatus with a position stabilization device featuring first and second positioning elements and counter elements that engage with each other to securely hold the battery in the compartment, utilizing a tension element to ensure the battery is firmly retained, allowing for easy assembly and demoulding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If guide webs are used to guide the battery during insertion, then the battery can be positioned in the battery compartment, but undesired relative movements occur between the battery compartment and the battery due to vibrations during operation
Solution Approach 1:
The battery compartment is designed with two side walls that can move relative to each other between an open state (during insertion) and a closed state (during operation). The tension element creates a dynamic system where the side walls are pulled together by tension force, automatically transitioning from the open state to the closed state after battery insertion, thereby adapting to different operational phases
Solution Approach 2:
The tension element is pre-loaded with tension force before battery insertion. This preliminary action ensures that once the battery is inserted and the side walls close, the battery is immediately and firmly held in position, preventing any relative movements during operation without requiring additional active components
2Reliability
If the battery is firmly held in the battery compartment using positioning elements, then relative movements are prevented, but the battery compartment becomes difficult to demould after production
Solution Approach 1:
The side walls are designed to be dynamically positioned: during production, they can be in an open state that facilitates easy demoulding of the battery compartment from the mould. After production, the tension element pulls the side walls into a closed state that firmly secures the battery. This dynamic configuration resolves the contradiction between easy manufacture and reliable retention
Solution Approach 2:
The battery compartment is segmented into a base wall and two movable side walls that can be separated from each other. This segmentation allows the side walls to be pulled apart during demoulding for easy production, while being pulled together during operation for secure battery retention. The positioning elements are integrated into this segmented structure
3Ease of manufacture
If the side walls are oriented at an angle opening away from the base wall for easy demoulding, then production is simplified, but the battery cannot be firmly held in position during operation
Solution Approach 1:
The side walls dynamically change their angular orientation: during production they are oriented at an angle opening away from the base wall to facilitate demoulding, while during operation the tension element pulls them into a parallel or converging orientation that firmly holds the battery. This dynamic reconfiguration resolves the contradiction between manufacturing ease and operational reliability
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 solution effectively prevents relative movements between the battery and the compartment, ensuring secure battery retention while facilitating easy production and assembly, reducing the risk of jamming and enhancing operational stability.
Implementation Method 1
The work apparatus comprises a tension element. The first longitudinal end and the second longitudinal end are pressed to each other by means of the tension element.
Data Source
AI summary
A hand-held work apparatus includes a tool, an electric motor for driving the tool, a battery and a battery compartment for accommodating the battery. The battery can be inserted into the battery compartment in an insertion direction and has a first and second outer side which oppose each other. The work apparatus comprises a position stabilisation device having at least one first and second positioning element on the battery compartment and having at least one first counter element on the first outer side of the battery and having at least one second counter element on the second outer side of the battery on the battery. In a ready-to-use state of the work apparatus, the first positioning element corresponds to the first counter element and the second positioning element corresponds to the second counter element. The battery is arranged between the first positioning element and the second positioning element.