Key Cutting Machine Clamp With Dynamometric Spring Mechanism
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Solution Overview
Problem
Existing key clamps for key cutting machines require operator skill and experience to apply the right amount of force, leading to potential key vibration, detachment, cutter breakage, or key damage due to either loose or tight clamping.
Innovation Solution
A clamp design featuring a vertical pin with a base plate, adjustable angular positions, and a dynamometric mechanism using a coil spring and toothed sleeves to ensure constant clamping force, independent of operator ability, with adjustable preload and torque control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the knob is too loosely tightened, then the key can be easily inserted and removed, but the key does not become securely fixed and can vibrate during milling
Solution Approach 1:
The spring-loaded mechanism provides continuous feedback force on the key, automatically adjusting to maintain optimal clamping pressure. The spring constant and preload are designed to provide sufficient holding force while preventing excessive compression that could damage soft key materials.
Solution Approach 2:
The invention changes the clamping force parameter from operator-dependent variable to spring-controlled constant. By selecting appropriate spring constants and preload values, the system achieves reliable key fixation without requiring operator skill to adjust the force level.
2Reliability
If the knob is too tightly tightened, then the key becomes securely fixed, but the clamp undergoes early wear and the key is damaged
Solution Approach 1:
The spring mechanism provides continuous feedback that prevents over-compression. Once the key is adequately clamped, the spring force maintains constant pressure without increasing, preventing damage to soft key materials like aluminum while ensuring secure fixation.
Solution Approach 2:
The spring acts as a cushioning element that absorbs excess compression force before it can damage the key. The spring's elastic properties allow it to deform under excessive force, protecting both the key and clamp from damage while maintaining adequate clamping.
3Reliability
If the operator applies excessive force, then the key is securely clamped, but cutter breakage may occur
Solution Approach 1:
The spring-loaded clamp provides beforehand cushioning against excessive clamping forces. The spring's elastic deformation capacity absorbs any excess force applied during key insertion, preventing force transmission to the cutter that could cause breakage while ensuring adequate key clamping.
Solution Approach 2:
The invention changes the clamping force from operator-controlled variable to spring-controlled constant with built-in force limitation. The spring constant is selected to provide sufficient clamping force for key security while inherently limiting the maximum force to prevent cutter breakage.
4Device complexity
If manual clamping force control is used, then the clamp structure is simple, but the operation requires operator skill and experience
Solution Approach 1:
The spring-loaded mechanism makes the clamp self-adjusting and self-regulating. The spring automatically provides the correct clamping force based on key insertion, eliminating the need for operator skill to judge the appropriate force level. The operator simply inserts the key and the spring does the rest.
Solution Approach 2:
The invention replaces operator skill-based force control with spring-constant-based force control. By selecting appropriate spring constants and preload values during manufacturing, the system achieves reliable operation without requiring trained operators, simplifying the operational requirements while maintaining adequate structural complexity.
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
The clamp provides consistent key clamping force, preventing damage and cutter issues, while allowing adaptation to different key materials, regardless of operator expertise.
Implementation Method 1
Between the two jaws 6 and 10 a coil 14 spring is disposed, acting in the sense of maintaining the upper jaw 10 spaced from the lower jaw 6 along the pin 2, to hence maintain the four slots 12 open.
Implementation Method 2
A lever 8 is also applied to the base plate 4 and interacts with the fixed jaw 6 to enable the clamp to be positioned in four different angular positions rotated through 90°
Data Source
Figure 1~3
AI summary
Clamp for key cutting machines, of the type comprising a pair of jaws (6, 10) mounted on a single pin (2) fixed to the machine structure and associated with a knob (22) screwable on a threaded portion of said pin (2) and acting in the sense of causing said jaws to forcedly approach each other, against the elastic reaction of a spring (14) tending to repel them, and to retain a key positioned between them, characterised by comprising a friction type overload clutch (18, 20, 30) interposed between said knob (22) and said pin (2).