Dual Size Tool-Bit Holder with Segmented Bore and Detent Sleeve
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Solution Overview
Problem
Existing quick-release chucks can only accommodate tool-bits with a single cross-sectional size shank, limiting their versatility and requiring matching bore sizes for proper operation, which restricts the ability to efficiently exchange tool-bits of varying sizes.
Innovation Solution
A tool-bit holder with a hub featuring multiple bore sections of different profiles and radial slots, a spring-biased sleeve, and detent balls that allow for quick release and retention of tool-bits with varying shank sizes by adjusting the sleeve's position to engage or disengage the detent balls, enabling the use of tool-bits with different cross-sectional profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a quick-release chuck uses a spring biased sleeve with a single size receiving bore, then tool-bits can be exchanged quickly without adjusting jaws, but the chuck can only accommodate tool-bits with a single cross-sectional size
Solution Approach 1:
The receiving bore is segmented into multiple sections (first bore section with first profile, second bore section with second profile) along the longitudinal axis, allowing different tool-bit sizes to be accommodated at different positions within the same chuck without requiring multiple chucks or size adjustments
Solution Approach 2:
The single receiving bore structure is designed to perform multiple functions by accommodating different tool-bit cross-sectional sizes (first size in first bore section, second size in second bore section) through the same quick-release mechanism, eliminating the need for separate chucks for different sizes
2Reliability
If the receiving bore size matches the tool-bit shank size for proper operation, then rotational torque is sufficient, but tool-bits with different sizes cannot be used in the same chuck
Solution Approach 1:
Different sections of the receiving bore have different profiles matched to specific tool-bit sizes (first profile for first size, second profile for second size), ensuring proper local engagement and torque transmission for each tool-bit size while maintaining a single unified chuck structure
3Adaptability or versatility
If traditional incremental chucks use three adjustable jaws, then various tool shank sizes and shapes can be accommodated, but changing a tool-bit takes time and extensive operator involvement
Solution Approach 1:
The detent balls are pre-positioned within the receiving bore at multiple locations corresponding to different tool-bit sizes. When a tool-bit is inserted, the appropriate detent ball automatically engages with the tool-bit shank, eliminating the need for operator intervention to adjust jaw positions before each tool change
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
Enables quick and efficient exchange of tool-bits with varying shank cross-sectional sizes within the same chuck assembly, allowing for convenient and efficient tool-bit changes without the need for adjusting jaws or using a chuck key, and accommodating reversible tool-bits with different working ends.
Implementation Method 1
A spring is provided for biasing the sleeve along the hub between a locking position and a retracting position
Implementation Method 2
The tool-bit is prevented from being axially extracted from the chuck by the ball. The spring biased shoulder is urged against the detent ball which locks it against a retaining face on the tool-bit
Data Source
AI summary
A tool-bit holder (10) for varying tool-bit shank profiles comprising a hub (12) having a longitudinal bore (28) adapted for receiving a tool-bit shank (66, 70, 80). The hub (12) has a plurality of radial slots (38) communicating with the first section (30) of the longitudinal bore (28). The tool-bit holder (10) has a collar (14) fixedly attached to the hub (12) adjacent the open (29) and disposed annularly about the hub (12). A sleeve (16) is axially slideably mounted and disposed annularly about the hub (12). The sleeve (16) has a plurality of radial bores (48), each being in communication with a respective radial slot (38) of the hub (12) with a detent ball (18) disposed within each. A spring (20) is provided for biasing the sleeve (16) towards the open end (29) wherein the detent ball (18) engages an inner ramp face (46) of the collar (14).