Power Tool Connecting Shaft Axial Movement and Dust Protection
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Solution Overview
Problem
Current gun drill-type power tools face issues with inconvenient tool bit replacement, tool bit loss, low efficiency, and reliability due to the design of existing multi-bit drum-like magazine structures, which lead to dust contamination, motor damage, and reduced service life.
Innovation Solution
A power tool design featuring a housing with a motor, a connecting shaft, and a cartridge with a tool chamber for parallel tool bits, where the connecting shaft moves axially between working and release positions, and a restricting mechanism prevents backward movement, ensuring reliable operation and easy tool bit replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a drum-like magazine structure is used for storing multiple tool bits, then tool bit storage capacity is improved, but the device complexity increases and reliability deteriorates due to dust contamination and mechanical failure
Solution Approach 1:
The patent divides the tool bit storage system into separate individual slots within the magazine, with each slot independently holding one tool bit. This segmentation prevents dust and debris from affecting the entire magazine structure, as contamination in one slot does not propagate to other slots. The connecting shaft is also segmented with individual engagement features for each tool bit, allowing isolated operation and maintenance of specific bits without affecting the whole system.
Solution Approach 2:
The patent extracts the tool bits from a centralized rotating drum structure and places them in fixed individual slots within the magazine. This extraction eliminates the rotating mechanical components that were prone to dust contamination and mechanical failure. The tool bits are now held in static positions, and the connecting shaft engages with them through linear movement rather than rotation, significantly improving reliability by removing the problematic rotating mechanism.
2Ease of operation
If the drum-like magazine is designed to slide away from the tool main body for bit selection, then ease of operation is improved, but loss of time increases due to manual intervention and bit replacement inconvenience
Solution Approach 1:
The patent implements a self-service mechanism where the connecting shaft automatically engages with the tool bits in the magazine through its own axial movement during the drilling operation. As the connecting shaft moves forward to engage a tool bit, it automatically selects and positions the correct bit without requiring manual intervention. The magazine structure itself facilitates this automatic selection through its slot arrangement and the connecting shaft's engagement features, eliminating the need for operators to manually slide or rotate the magazine for bit selection.
3Ease of operation
If the connecting shaft is exposed outside when the drum-like magazine leaves the main body, then ease of operation is improved, but object-affected harmful factors increase due to dust and powder entry
Solution Approach 1:
The patent employs a protective housing or cover structure that encloses the magazine and connecting shaft assembly. This flexible or movable protective shell allows the connecting shaft to move axially for tool bit engagement while maintaining a sealed environment that prevents dust and powder from entering the internal components. The protective shell may include seals or gaskets at critical interfaces, ensuring that the exposed connecting shaft remains protected from contamination during operation.
4Adaptability or versatility
If the transmission mechanism is designed to bear reverse action force from the tool bit, then adaptability is improved, but reliability deteriorates due to inability to transmit torque
Solution Approach 1:
The patent inverts the traditional transmission mechanism design by positioning the force bearing components separately from the torque transmission path. Instead of the transmission mechanism bearing the reverse action force, the patent designs the connecting shaft and magazine structure to independently handle reverse forces through dedicated support features. The transmission mechanism then focuses solely on torque transmission without the burden of bearing reverse loads, significantly improving reliability while maintaining adaptability through the separate force handling design.
Data Source
AI summary
A power tool, including: a housing, a motor, arranged in the housing and outputting rotary force, a connecting shaft, adapted to one of a plurality of tool bits, a transmission mechanism, arranged between the motor and the connecting shaft and transmitting the rotary force from the motor to the connecting shaft, a cartridge, the cartridge includes a tool chamber for receiving the plurality of tool bits, the connecting shaft being capable of moving axially between a working position wherein the connecting shaft is adapted to the tool bits and a release position wherein the connecting shaft is separated from one of the plurality of tool bits, and a restricting member, the restricting member operable to move between two positions; at a first position, the restricting member limits the movement of the connecting shaft; and at a second position, the restricting member allows the connecting shaft to move.