Rotational Nut Attachment on Cable Shoe Flat Part
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Solution Overview
Problem
Existing methods for attaching a nut to a cable shoe's flat part connecting section are costly due to the need for special designs, such as undercuts or conical widenings, which can lead to high production expenses and surface losses, limiting the economical production of rotationally connected nuts.
Innovation Solution
The nut is attached with a holder section that protrudes beyond the passage opening's narrowest cross section, and subsequently widened by plastic deformation to secure it in a freely rotatable and interlocking manner, allowing for separate production of the recess and integration into existing cable shoe production cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the holder section is pre-formed with an undercut or the passage opening is conically widened, then the nut can be securely attached in a rotatable manner, but the production costs increase and surface loss occurs
Solution Approach 1:
The recess is produced in the flat part connecting section before the nut is attached, allowing the holder material section to be pre-formed without requiring subsequent deformation of the cable shoe. This preliminary preparation enables cost-effective production while ensuring secure rotational attachment of the nut.
2Ease of manufacture
If the passage opening is conically widened to allow holder section insertion, then the nut can be attached, but considerable surface loss occurs on the bottom side of the flat part connecting section
Solution Approach 1:
Instead of conically widening the entire passage opening, the invention creates a localized recess only in the region where the holder material section needs to be formed. This localized deformation approach minimizes surface loss on the bottom side of the flat part connecting section while still enabling secure nut attachment.
3Reliability
If special designs like undercuts or conical widenings are used, then rotational connection is achieved, but production becomes less economical for standard quantities
Solution Approach 1:
The invention separates the production of the recess in the flat part connecting section from the attachment of the nut. The recess can be produced as a standard feature in the cable shoe manufacturing process, and then nuts can be attached using a simple pressing operation without requiring complex deformation tools or processes, thereby improving production economy.
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 method reduces production costs and maintains the usability of the nut without additional deformation of the cable shoe, enabling a cost-effective and efficient rotational connection that preserves the cable shoe's surface treatment and conductive properties.
Implementation Method 1
a tapered portion of the passage opening is formed by a holder material section, which is pre-curved into the passage opening by deformation
Implementation Method 2
subsequently widened by plastic deformation to secure it in a freely rotatable and interlocking manner
Data Source
AI summary
The invention relates to a method for producing a nut which is rotationally connected to a flat part connecting section of a cable shoe, wherein the flat part connecting section has a passage opening, the nut has a sitting face which is at the bottom in the connected state, and a holder section extends on the nut from the sitting face further downward, wherein a tapered portion of the passage opening is formed by a holder material section which is preliminarily curved into the passage opening by deformation, and the holder material section is produced by a recess which is made in the flat part connecting section so as to surround the passage opening on a top side of the flat part connection section, which top side is associated with the sitting face. In order to specify a method of this kind which can be carried out in respect of production, in particular in respect of the production costs, in a favourable manner, it is proposed that the holder material section is first formed and the nut is placed onto the top side, wherein the holder section protrudes downward beyond a narrowest cross section of the passage opening which is formed by the holder material section, and that the holder section is then widened below the narrowest cross section, for the purpose of holding the nut on the cable shoe in a rotatable and interlocking manner. The invention further relates to a nut which is fitted in a rotatable manner on a flat part connecting section of a cable shoe.