Inner Pipe Nut Fixing with Cam Positioning for Small Diameters
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Solution Overview
Problem
Conventional methods for fixing nuts to the inner surface of pipe members with smaller diameters often result in distortion of the nut attachment surface and require synchronization of punch and die operations, leading to potential shaft instability and incomplete fixation.
Innovation Solution
A device comprising a unit box with a rotation shaft and cam mechanism that allows the nut holder to advance and bring the nut into contact with the pipe member's inner surface, followed by a die operation to secure the nut, eliminating the need for a shaft and synchronizing punch and die timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a shaft incorporating a punch is used to fix a nut to the inner surface of a pipe member, then the nut can be clinched and fixed to the wall surface, but the device can only be used for pipe members having an inner diameter larger than that of the shaft
Solution Approach 1:
The device divides the pipe member processing into two independent operations: first inserting the unit box with nut holder into the pipe member to position the nut, then inserting the die from the outer peripheral side to perform clinching. This segmentation allows the operations to be performed independently without requiring the shaft to pass through the entire pipe, enabling use with pipe members of smaller inner diameters.
Solution Approach 2:
The punch function is extracted from the shaft structure and replaced by a separate die that is inserted from the outer peripheral side of the pipe member. This extraction eliminates the requirement for the shaft to extend through the pipe member, allowing the device to be used with pipe members having inner diameters smaller than the shaft diameter.
2Manufacturing precision
If the punch and die are synchronized to clinch and fix the nut, then the nut can be fixed to the pipe member, but the nut attachment surface becomes distorted when time lag occurs between operation timing
Solution Approach 1:
The clinching operation is segmented into two independent stages: first the nut holder advances to position the nut against the inner surface, then the die is inserted to perform the actual clinching. This segmentation eliminates the need for synchronization between punch and die operations, as they are performed sequentially rather than simultaneously, preventing surface distortion caused by timing mismatches.
3Reliability
If the shaft outer diameter is smaller than the pipe member inner diameter, then the shaft can be inserted, but the shaft becomes cantilevered and inclined by fixing load, preventing normal nut fixation
Solution Approach 1:
The shaft is completely removed from the device structure. Instead of using a shaft to hold and position the punch, the invention uses a unit box that is inserted into the pipe member to hold the nut holder. The punch function is performed by a separate die inserted from the outer peripheral side. This extraction eliminates the cantilevered shaft structure and its associated stability problems.
4Reliability
If a mechanism is added to bring the shaft into close contact with the floor surface to avoid cantilevered state, then shaft stability improves, but device complexity increases
Solution Approach 1:
Rather than adding stabilization mechanisms to an existing shaft structure, the invention completely extracts the shaft from the device. The unit box serves as the insertion carrier, and the die serves as the punching tool, eliminating the need for any shaft-related stabilization mechanisms and simplifying the overall device structure.
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 secure nut fixation on pipe members with smaller diameters without distortion, ensuring proper attachment and eliminating the need for additional stabilization mechanisms, while allowing for correct alignment and pressurization without tilting.
Implementation Method 1
a cam fixed to the rotation shaft in the unit box, and a nut holder configured to advance from the unit box toward the inner surface of the pipe member by rotation of the cam
Data Source
AI summary
A device for fixing a nut to an inner surface of a pipe member having a small inner diameter is provided. The device includes a unit box (10) to be inserted into the pipe member, a rotation shaft (11) extending from the unit box (10) to the outside of the pipe member, a cam fixed to the rotation shaft (11) in the unit box (10), and a nut holder (18) that advances from the unit box (10) toward the inner surface of the pipe member by the rotation of the cam. A pressure receiving member to be abutted on the inner surface of the pipe member is provided on an opposite surface of the nut holder (18).