Compact Offset Gear Unit With Pivoting Bit Lock for Fast Bit Changes
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Solution Overview
Problem
Existing offset gear units for power tools face challenges in handling small screws and frequent bit changes, particularly in compact designs, due to constraints in size and usability.
Innovation Solution
A compact offset gear unit design with a bit securing member that cooperates with an abutment feature on the bit, allowing for straightforward bit changes by pivoting into a locked or unlocked position, reducing the need for complete removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact offset gear unit design is used, then the size is reduced, but the ease of bit change deteriorates
Solution Approach 1:
The bit securing mechanism is segmented into a bit holder and a movable securing member that can independently pivot between locked and unlocked positions. This allows the bit to be quickly released without removing the entire bit holder from the compact gear unit, resolving the contradiction between compact size and ease of bit change.
Solution Approach 2:
The bit securing member is designed to be movable between locked and unlocked positions, transforming a static securing mechanism into a dynamic one. This enables rapid bit changes by simply pivoting the securing member, maintaining ease of operation within the compact form factor.
2Reliability
If a traditional bit securing mechanism is used, then the bit is securely held, but the time required for bit change increases
Solution Approach 1:
The bit holder pre-positions the bit in a ready-to-use state with the securing member already in place. When bit change is needed, only a simple pivoting motion is required to release and swap the bit, significantly reducing change time while maintaining secure holding during operation.
Solution Approach 2:
The movable securing member transitions from a static locking mechanism to a dynamic one that can quickly pivot between locked and unlocked states. This dynamic design maintains reliable bit securing during operation while enabling rapid bit changes, reducing the time loss associated with frequent bit swaps.
3Ease of operation
If the bit holder is designed for complete bit removal, then bit change is possible, but the device complexity increases
Solution Approach 1:
The bit holder is segmented into the holder body and a separate movable securing member. This segmentation allows for a simple pivoting motion to release the bit without requiring complex disassembly mechanisms, achieving ease of bit change with minimal added complexity.
Solution Approach 2:
Instead of requiring complete removal of the bit holder for bit changes, the design inverts the approach by using a movable securing member that can be quickly pivoted to release the bit while the holder remains in place. This simplifies the overall mechanism compared to designs requiring full disassembly.
Data Source
AI summary
The present specification related to an offset gear unit for use with a power tool for tightening of threaded fasteners comprising a housing, an input gear wheel for connection to an output shaft of the power tool, an output gear wheel, and at least one intermediate gear wheel, wherein the offset gear unit further comprises a bit receiving arrangement for receiving a bit, the bit being arranged to be driven in rotation by the output wheel and wherein the bit receiving arrangement comprises a bit securing member adapted to cooperate with an abutment feature provided on the bit in order to secure the bit in the offset gear unit in an axial direction. The present specification also relates to a power tool and a kit comprising such an offset gear unit.