Bushing for Supporting Screw Taps in Tight Spaces
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Solution Overview
Problem
Existing tap wrenches are cumbersome and difficult to maneuver in narrow spaces, leading to improper or defective tapping operations, particularly in confined environments such as ships, where the handle may interfere with adjacent objects, resulting in potential damage to machine parts.
Innovation Solution
A bushing that provides a seat for coupling to the tap tang and a seat for a ratchet or wrench, allowing for easier handling and operation of screw taps without the need for a full turn, enabling use in tight spaces, and adaptable to various tools like ratchets, T-wrenches, and socket wrench sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a traditional tap wrench with a long handle is used, then sufficient torque can be applied for tapping operations, but the handle interferes with adjacent objects in narrow spaces making it difficult to maneuver
Solution Approach 1:
The invention divides the traditional tap wrench into two separate components: a bushing that fits into the tap's square tang, and a separate operating tool (ratchet or wrench) that engages with the bushing. This segmentation allows the tap itself to serve as the torque transmission element, eliminating the need for a long external handle while maintaining sufficient torque application capability through the bushing's direct engagement with the tap's square section.
Solution Approach 2:
The bushing is designed to fit inside the square tang of the tap, creating a nested configuration where the bushing is contained within the tap's structural envelope. This nesting approach allows the operating tool to engage with the tap through the bushing without requiring external space for a long handle, thereby enabling torque application in confined spaces while maintaining mechanical advantage.
2Reliability
If a tap wrench with a long handle is used, then proper tapping operation can be performed, but the tool becomes cumbersome and difficult to handle in confined environments
Solution Approach 1:
The invention extracts the operating mechanism from the traditional integrated tap wrench design and separates it into distinct components. The bushing remains with the tap, while the operating tool (ratchet or wrench) is a separate entity that engages with the bushing. This extraction simplifies the overall system by allowing the use of compact, simple tools instead of a complex long-handled wrench, thereby maintaining tapping reliability while reducing device complexity.
Solution Approach 2:
The bushing is designed as a universal interface that can work with various operating tools including ratchets, T-wrenches, and socket wrenches. This multi-functionality allows the same bushing-tap combination to be operated with different tool types depending on the specific application requirements, thereby maintaining reliable tapping operations while using simple, compact tool structures without requiring a specialized long-handled wrench for each situation.
3Ease of operation
If a ratchet is used with the bushing, then the tap can be rotated without full turns enabling operation in very narrow spaces, but additional coupling mechanisms are required
Solution Approach 1:
The invention merges the function of the tap's square tang with the bushing's internal square cavity, creating an integrated torque transmission path. The ratchet's square pin then engages with the bushing's square cavity, effectively combining the tap, bushing, and ratchet into a unified operational system. This merging eliminates the need for complex external coupling mechanisms while enabling ratchet operation in tight spaces, as the coupling is built into the bushing structure itself rather than requiring separate attachment devices.
Data Source
AI summary
The invention relates to a bushing for supporting screw taps (2), which features a first front seat (10) to be coupled to a shank (3, 3a) of a screw tap, a second rear seat (12) to be coupled to a tool (16, 17; 20, 21, 22) for operating the bushing (1). The bushing allows operating the tap (2) by means of ratchets, wrenches and other tools, so that holes can be tapped even in tight spaces and conditions.