Torque Driver Tapered Lead End Small Fastener Engagement
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Solution Overview
Problem
Existing torque transmission drivers struggle to efficiently transmit torque to small fasteners with recess dimensions less than 0.100 inch, leading to difficulties in engagement, stabilization, and increased risk of cross-threading or strip-out, which complicates assembly and quality control.
Innovation Solution
A torque transmission driver with a main body featuring a key shape and a protruding lead end that tapers between 10° and 30° from a plane perpendicular to the drive axis, designed to fit small fastener recesses, enhancing torque transmission and reducing the likelihood of strip-out by increasing the surface area of contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional torque transmission driver is used for small fasteners with recess less than 0.100 inch, then the driver can engage the fastener, but the engagement is unstable and torque transmission is insufficient
Solution Approach 1:
The driver tip is segmented into two distinct functional zones: a cylindrical body portion for initial engagement and a tapered lead end for enhanced torque transmission. This segmentation allows each portion to perform its specific function optimally, with the cylindrical body providing stable positioning and the tapered lead end providing superior torque transfer to the fastener recess.
Solution Approach 2:
The driver incorporates local quality by creating a tapered lead end with different geometric properties than the cylindrical body. The tapered portion has increased surface area and optimized contact geometry specifically at the engagement point, allowing enhanced torque transmission capability where it is most needed while maintaining the simple cylindrical form for the majority of the driver length.
2Power
If a conventional torque transmission driver is used for small fasteners, then the driver structure is simple, but the torque transmission capability is reduced
Solution Approach 1:
The tapered lead end performs preliminary action by making initial contact with the fastener recess and guiding the driver into proper alignment before full engagement. This preliminary contact establishes optimal positioning and prepares the fastener recess for effective torque transmission, preventing misalignment and cross-threading issues.
Solution Approach 2:
The invention adds a dimensional element by transitioning from a purely cylindrical cross-section to a tapered geometry that varies the cross-sectional dimensions along the length. This dimensional change increases the contact surface area between the driver and fastener recess, enabling enhanced torque transmission capability.
3Reliability
If a conventional torque transmission driver is used for small fasteners with fine threads, then the installation process is simple, but cross-threading and strip-out occur readily
Solution Approach 1:
The tapered lead end acts as an intermediary element between the driver body and the fastener recess. It provides a gradual transition zone that distributes the engagement forces more evenly, reducing stress concentrations that could cause cross-threading or strip-out of fine threads during the installation process.
4Ease of operation
If a conventional torque transmission driver is used for small fasteners, then the tool design is straightforward, but engagement and stabilization are difficult
Solution Approach 1:
The tapered lead end performs preliminary alignment and engagement actions automatically during the insertion phase. As the driver approaches the fastener, the tapered geometry self-aligns with the recess and establishes contact before the cylindrical body fully engages, eliminating the need for precise manual positioning and reducing installation time.
Data Source
AI summary
A torque transmission driver is disclosed. The torque transmission driver has a main body having a first end portion and a second end portion, where the first end portion is adapted to receive and transmit torque from a torque generation source, and the second end portion is opposite the first end portion and has a key shape adapted to fit a recess in a fastener and has a protruding lead end having a taper between 10 and 30 and different in shape than the key shape with at least a portion of the protruding lead end substantially coextensive with the major dimension of the key shape. A torque transmission driver adapted to drive a small fasteners is also disclosed where the key shape is adapted to fit the recess of the small fastener.