Segmented Drive Bore for Fastener Collation Diving Back
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Solution Overview
Problem
Existing fastener driving tools face issues with accommodating fasteners of various lengths, leading to inaccurate driving, jamming, and tool damage due to the 'diving back' of short fasteners, especially when used with combustion-powered tools in concrete or steel applications.
Innovation Solution
A collation system with sleeves of varying lengths and frangible bridges that support fasteners of different lengths, ensuring proper alignment and separation, and a loading mechanism that prevents short fasteners from exiting the drive bore, allowing for the use of fasteners with tips positioned uniformly relative to the sleeve front.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a long drive bore opening is used to accommodate long fasteners, then long fasteners can be driven, but short fasteners may tip or angle into the opening causing diving back
Solution Approach 1:
The drive bore is segmented into two distinct zones: a first zone with a larger diameter for receiving and guiding the fastener, and a second zone with a smaller diameter that prevents the fastener tip from exiting. This segmentation allows the same drive bore to accommodate both long and short fasteners reliably, preventing diving back while maintaining versatility.
2Adaptability or versatility
If a long drive bore opening is used to accommodate long fasteners, then long fasteners can be driven, but tool jamming may occur
Solution Approach 1:
The drive bore is segmented into two distinct zones: a first zone with a larger diameter for receiving and guiding the fastener, and a second zone with a smaller diameter that prevents the fastener tip from exiting. This segmentation allows the same drive bore to accommodate both long and short fasteners reliably, preventing diving back while maintaining versatility.
3Adaptability or versatility
If a long drive bore opening is used to accommodate long fasteners, then long fasteners can be driven, but tool damage may occur due to large forces
Solution Approach 1:
The drive bore is segmented into two distinct zones: a first zone with a larger diameter for receiving and guiding the fastener, and a second zone with a smaller diameter that prevents the fastener tip from exiting. This segmentation allows the same drive bore to accommodate both long and short fasteners reliably, preventing diving back while maintaining versatility.
4Device complexity
If prior collations hold fasteners proximate their heads regardless of length, then collation design is simple, but short fasteners have excessive shank portion below collation leading to diving back
Solution Approach 1:
The collation is designed with varying support lengths for different fastener positions: fasteners nearer the front of the collation have longer support portions extending below the collation, while fasteners nearer the rear have shorter support portions. This local variation in support length ensures that each fastener has appropriate support relative to its position, preventing diving back while maintaining reliable operation.
Data Source
AI summary
A collation comprises a plurality of sleeves for supporting and carrying a plurality of fasteners through a magazine, wherein each of the plurality of sleeves have a front and a predetermined length of between about ¼ and about 0.4 inch, each of the plurality of fasteners have a predetermined length of between about ¾ inch and about 1 ½ inch and a tip located at a predetermined position from about 0.05 inch behind the sleeve front to about ¼ inch beyond the sleeve front, frangible bridges integrally connecting the plurality of sleeves together in a serial array and facilitating the separation of a leading one of the plurality of sleeves from remaining ones of the plurality of serially arranged sleeves when a drive member of the fastener driving tool drives a leading one of the fasteners disposed within the leading one of the sleeves, and a plurality of protrusions from the sleeves for engaging the rails in the magazine.