Rotatable Screwdriver Actuation Collar for Forward and Reverse Control
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Solution Overview
Problem
Existing battery-powered tools lack a mechanism to determine or adjust the direction of output actuation, with the actuation collar being biased forward and not providing directional control.
Innovation Solution
A power tool, such as a screwdriver, featuring a rotatable actuation collar with three positions: lock-off, forward operation, and reverse operation, which slides forward to actuate the output member in respective directions, utilizing microswitches for activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the actuation collar is biased forward and pulled rearward to actuate the tool, then the tool can be actuated, but the collar cannot determine or adjust the direction of the output
Solution Approach 1:
The collar is made rotatable between different positions (forward operation position, reverse operation position, and lock-off position) rather than being fixed in a single actuation direction. This dynamic repositioning capability allows the collar to control the direction of output while maintaining a relatively simple overall structure.
Solution Approach 2:
The collar serves multiple functions: it acts as the actuation mechanism, the directional control element, and the position indicator all in one component. By making the collar rotatable to different positions, it universally controls both the activation and direction of the output member.
2Ease of operation
If the collar is made rotatable to multiple positions, then directional control is achieved, but the device complexity increases
Solution Approach 1:
The collar's rotational movement is segmented into distinct positions (forward, reverse, and lock-off) with detent mechanisms providing stable stops at each position. This segmentation allows for clear directional control without requiring continuous adjustment mechanisms.
Solution Approach 2:
Detent mechanisms and corresponding detents act as intermediaries between the collar and the actuation system, providing stable positioning at each operational state without requiring complex locking mechanisms.
3Reliability
If microswitches are added to detect collar position, then directional actuation is enabled, but the device complexity increases
Solution Approach 1:
Microswitches provide feedback on the collar's position to the control system, enabling reliable detection of whether the collar is in the forward operation position or reverse operation position. This feedback ensures accurate directional actuation.
Solution Approach 2:
The microswitches are integrated into the existing collar mechanism, utilizing the collar's own movement to actuate the switches without requiring separate sensing mechanisms. The collar's projection directly engages the microswitch actuator.
Data Source
AI summary
A screwdriver including an output member, a motor configured to selectively drive the output member, a battery and an actuation collar. The actuation collar is movable in a forward direction towards the output member to actuate the screwdriver.