Single-Collar Clutch Control for Multi-Mode Handheld Power Tools
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Solution Overview
Problem
Existing multi-function handheld electric tools require users to manually select between multiple operating modes and torque settings, which can be cumbersome and prone to incorrect mode selection.
Innovation Solution
A power tool design featuring a single mode selection collar that rotates to select between non-torque-limited and torque-limited operation modes, with a clutch mechanism that adjusts torque output based on the collar's position, ensuring only one mode is active at a time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate mode selection means are used to select between different operating modes and torque settings, then the tool can provide multiple functions, but the device complexity increases and operation becomes more cumbersome
Solution Approach 1:
The patent combines multiple mode selection functions into a single rotary collar that integrates both hammer/non-hammer mode selection and torque-limited/non-torque-limited mode selection. This single collar replaces what would traditionally require separate switches or dials, reducing device complexity while maintaining full multi-function capability.
Solution Approach 2:
The rotary collar is designed as a universal control element that performs multiple functions: selecting between hammer and non-hammer modes, selecting between torque-limited and non-torque-limited modes, and providing intermediate torque settings. This multi-functional design eliminates the need for separate specialized controls.
2Adaptability or versatility
If multiple separate mode selection means are used, then different functions can be selected, but the ease of operation decreases due to more selection steps
Solution Approach 1:
By merging all mode selection functions into one rotary collar, the user interacts with a single control element rather than multiple separate switches. This consolidation simplifies the user interface and makes operation more intuitive and convenient.
Solution Approach 2:
The rotary collar provides dynamic, continuous adjustment capability with multiple predetermined positions along a single rotational path. Users can quickly transition between modes by rotating the collar to different positions, eliminating the need for multiple discrete switching actions.
3Ease of operation
If a single mode selector is used to select between multiple operating modes, then the ease of operation improves, but ensuring only one mode is selected at a time becomes more difficult
Solution Approach 1:
The clutch mechanism provides mechanical feedback that ensures only one mode can be active at a time. The clutch is positioned such that it can only engage with the transmission at specific rotational positions corresponding to valid mode selections, providing inherent feedback that prevents incorrect or simultaneous mode activation.
Solution Approach 2:
The clutch and transmission are designed with dynamic engagement characteristics that automatically prevent conflicting modes from being selected. The mechanical geometry ensures that as the rotary collar rotates to different positions, the clutch naturally engages or disengages based on the selected mode, providing automatic mode mutual exclusion.
Data Source
AI summary
A tool including a motor, a transmission including a ring gear including a face having a linear portion and ramps extending a fixed axial distance, a spindle, a setting collar, and a clutch coupled to the transmission. The collar is rotatable between predetermined angular positions including a first position corresponding to a non-torque-limited first operation mode and a plurality of second positions corresponding to different torque output settings of a torque-limited second operation mode. The clutch includes a follower positioned between a clutch washer and the face, and a clutch sleeve coupled to the collar that is movable a variable axial distance from the clutch washer dependent on the collar position. In the first angular position corresponding to the first mode, the fixed axial distance is greater than the variable axial distance, and in the second angular positions, the variable axial distance is greater than the fixed axial distance.