Pliers Actuation Assembly With Trapped Stop Part for Easy Automation
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Solution Overview
Problem
Existing crimping and tube pressing pliers require complex and costly assembly methods, involving threaded connections, friction locking, and rivets, which are not suitable for automated assembly and can lead to disassembly issues.
Innovation Solution
A pliers actuation assembly group with a pivot bolt and stop part design that uses a shoulder for support, allowing for secure assembly without threaded connections, and a method for assembling the pliers that includes inserting the pivot bolt and stop part into bearing eyes, with optional spacers and forced locking mechanisms for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threaded connections, friction locking, and rivets are used for assembly, then assembly strength and stability are improved, but assembly complexity and cost increase, and automated assembly becomes difficult
Solution Approach 1:
The hand lever is segmented into multiple plates (first hand lever plate, second hand lever plate, third hand lever plate, fourth hand lever plate) that are rigidly connected to form a unified structure. This segmentation allows for simplified assembly of the overall actuation assembly group while maintaining structural integrity through the modular plate design.
Solution Approach 2:
The pivot bolt and stop part are integrated into a unified assembly unit that combines positioning and securing functions. The stop part with its shoulder works together with the pivot bolt to provide both location and retention, eliminating the need for separate threaded connections or rivets for these functions.
2Reliability
If threaded connections and rivets are used for assembly, then disassembly resistance is improved, but assembly time and manufacturing cost increase
Solution Approach 1:
The stop part is designed with a shoulder that performs the securing action preliminarily during assembly. As the third hand lever plate is pushed onto the pivot bolt, the shoulder automatically engages with the plate to prevent disassembly, eliminating the need for subsequent threading or riveting operations to achieve disassembly resistance.
3Stability of the object's composition
If complex assembly methods are used, then assembly stability is improved, but ease of manufacture and automation potential are worsened
Solution Approach 1:
The assembly structure is designed to be self-securing through the stop part's shoulder that automatically engages with the third hand lever plate during assembly. This self-service mechanism provides assembly stability without requiring external fastening operations, making the assembly process simpler and more suitable for automation.
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
Facilitates simplified and potentially automated assembly of pliers, reducing assembly costs and improving disassembly resistance, while allowing for the use of different pliers heads with the same actuation assembly group to accommodate various workpieces.
Implementation Method 1
The hand levers (2, 3) are pivotally connected to one another via a pivot bolt (8) in such a way that relative pivotal movement is possible between the hand levers (2, 3)
Implementation Method 2
The movable die half is supported by a spring device on the die head frame in such a way that the spring device biases the die half in an opening direction
Implementation Method 3
crimped by plastic deformation of the crimp zone or sleeve
Data Source
AI summary
The invention relates to a pliers actuation assembly group (1), pliers and a method of assembling pliers.A maximum opening angle of the hand levers (2, 3) of the pliers actuation assembly group (1) is defined by a stop part (72), which extends through a hand lever plate (66) and which is accommodated in an elongated hole (69). When the maximum opening angle is reached, the stop part (72) comes to rest against a stop (70) formed by the end portion of the elongated hole (69). The stop part (72) is secured against disassembly by a support of a shoulder (75) of the stop part (72) in one direction on a hand lever plate (66) and of a support surface (77) on another hand lever plate (65), so that the stop part (72) is trapped between these hand lever plates (66, 65).