Bit Holder Sleeve and Bearing for Torque Overload Decoupling
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Solution Overview
Problem
Existing bit holders for power tools lack effective mechanisms to manage torque overload, leading to potential damage and reduced operational efficiency, as they fail to decouple the shank from the bit holding body during excessive torque, causing wear and impact on work surfaces.
Innovation Solution
A bit holder design incorporating a shank, bit holding body, bearing, and sleeve configuration that allows for selective decoupling of the shank from the bit holding body during torque overload, utilizing movable bearings and sleeves to absorb shock and prevent rotation interference, enabling independent rotation of the shank relative to the bit holding body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the shank is rigidly coupled to the bit holding body, then torque transfer efficiency is improved, but damage during torque overload increases
Solution Approach 1:
The bearing is designed to be movable between a first position (engaging both shank and bit holding body for torque transfer) and a second position (engaging only the bit holding body, allowing shank to rotate independently). This dynamic reconfiguration allows the system to switch from a rigid coupled state during normal operation to a decoupled state during torque overload, resolving the contradiction between torque transfer efficiency and damage prevention.
Solution Approach 2:
The bearing acts as an intermediary element between the shank and bit holding body. During normal operation, it mediates torque transfer efficiently. During torque overload, it can disengage from the shank while remaining engaged with the bit holding body, thereby mediating the overload condition by allowing independent rotation of the shank and preventing damage to the bit holding body and work surface.
2Stability of the object's composition
If the shank and bit holding body are rigidly coupled, then operational stability is improved, but wear on work surfaces increases during torque overload
Solution Approach 1:
The movable bearing enables the system to dynamically adjust its coupling state. During normal operation, the bearing maintains stable engagement with both shank and bit holding body, providing operational stability. During torque overload, the bearing can disengage from the shank, allowing it to rotate independently and preventing excessive wear on the work surface, thus resolving the contradiction between stability and wear prevention.
3Reliability
If a movable bearing mechanism is added, then torque overload management is improved, but device complexity increases
Solution Approach 1:
The bearing is segmented into movable components that can independently engage or disengage from the shank and bit holding body. This segmentation allows the bearing to selectively couple or decouple the shank from the bit holding body based on torque conditions, providing torque overload management while maintaining a relatively simple overall structure.
Solution Approach 2:
The movable bearing mechanism is designed to automatically respond to torque overload conditions without external control. When torque exceeds a certain threshold, the bearing self-actuates to disengage from the shank, allowing independent rotation. This self-service capability provides reliable torque overload management while avoiding the need for complex control systems.
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 design effectively manages torque overload by absorbing excessive torque and reducing wear on work surfaces, enhancing the operational efficiency and longevity of the bit holder by allowing the shank to rotate independently of the bit holding body during overload conditions.
Implementation Method 1
The bearing selectively couples the shank and the bit holding body together
Implementation Method 2
The sleeve disposed over the shank and the bit holding body such that the step is radially aligned with the groove of the shank, the aperture of the bit holding body, and the bearing to inhibit the bearing from moving out of the groove and the aperture
Data Source
AI summary
A bit holder configured to be driven by a power tool. The bit holder includes a shank, a bit holding body, a bearing, and a sleeve. The shank defines a groove. The bit holding body defines a longitudinal bore that receives a portion of the shank and an aperture defined in a surface of the bit holding body that is in fluid communication with the longitudinal bore. The bearing is received at least partially in the aperture of the bit holding body and at least partially in the groove of the shank. The sleeve including a step. The sleeve disposed over the shank and the bit holding body such that the step is radially aligned with the groove of the shank, the aperture of the bit holding body, and the bearing to inhibit the bearing from moving out of the groove and the aperture.