Hand Tool Positioning Apparatus with Intermediary Base
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Solution Overview
Problem
Conventional positioning apparatuses for hand tools experience unsmooth operation and imprecision due to the rough inner surface of the bore affecting the ball and spring, leading to unstable engagement between the ball and holes, making it difficult to apply force for screw fastening or unfastening.
Innovation Solution
The positioning apparatus includes a shank with a receiving space and slot, a driving head with positioning holes, a switch with a screw, and a positioning device comprising a spring, pusher, and base, where the screw passes through the switch and slots to engage with the pusher, allowing smooth movement and precise positioning by selectively engaging with the holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bore is drilled to receive the ball and spring, then the positioning apparatus can be constructed, but the rough inner surface of the bore causes unsmooth operation and imprecise positioning
Solution Approach 1:
The patent introduces a smooth-walled positioning device (base) as an intermediary component that receives the ball and spring. This base acts as a mediator between the rough bore and the ball-spring mechanism, providing a smooth internal surface that enables smooth operation and precise positioning while maintaining the simplicity of drilled construction.
2Device complexity
If the ball and spring are received directly in the rough bore, then the structure is simple, but the engagement between the ball and holes is unstable
Solution Approach 1:
The patent segments the positioning apparatus into distinct functional components: a base that houses the ball and spring, a pusher that transmits force, and a positioning device that provides stable engagement with the positioning holes. This segmentation allows each component to be optimized for its specific function while maintaining overall structural simplicity.
3Ease of manufacture
If the ball and spring move unsmoothly due to rough surface, then manufacturing is easier, but force application for screw fastening/unfastening becomes difficult
Solution Approach 1:
The smooth-walled base serves as an intermediary that facilitates smooth movement of the ball and spring, which in turn enables smooth operation of the pusher. This intermediary structure translates the simplicity of drilled construction into ease of operation by ensuring smooth force transmission to the screw.
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
This design enhances the smoothness and precision of the hand tool's operation, allowing easier force application for screw fastening/unfastening by providing stable and precise engagement between the pusher and positioning holes, improving user experience.
Implementation Method 1
The spring has one end abutting against a bottom of the recess and the other end abutting against the pusher
Data Source
AI summary
A positioning apparatus for hand tool includes a shank, a driving head, a switch, and a positioning device. The shank has a connecting end having a receiving space and a slot communicated with the receiving space. The driving head has multiple positioning holes. The switch includes a screw. The positioning device is received in the receiving space. The positioning device includes a spring, a pusher, and a base. The base is received in the receiving space. The base has a recess for receiving the spring and the pusher and a slot communicated with the recess. The spring has one end abutting against a bottom of the recess and the other end abutting against the pusher. The screw passes the switch and fastens with the pusher via the slot in the shank and the slot in the base. The pusher selectively engages with one of the multiple positioning holes.