Auto-Retractable Cutting Device with Spare Blade Box
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cutting devices with auto-retractable blades lack a spare blade box due to space constraints occupied by the long tail and backward extending pole, and they do not allow the blade to automatically retract before the user releases the actuator, posing safety risks.
Innovation Solution
A cutting device design with a housing that includes a spare blade box and an actuator system where the blade automatically retracts into the housing after cutting, utilizing a mechanism with a bottom protrusion and side protrusion for engagement, allowing the blade to stop at any position between fully extended and retracted, and incorporating a blade locking mechanism for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long tail and backward extending pole are used for blade retraction mechanism, then the blade can automatically retract, but the spare blade box cannot be accommodated in the housing
Solution Approach 1:
The invention extracts the retraction engagement features from the traditional long tail and backward extending pole configuration. Instead, it uses a front dent on the actuator seat that engages with the side protrusion on the blade seat, effectively removing the space-consuming long tail structure while preserving the automatic retraction function.
Solution Approach 2:
The invention changes the spatial arrangement of the retraction mechanism. Rather than using a long tail extending backward along the length of the housing, the new mechanism uses a front dent positioned on the actuator seat that engages with the side protrusion, utilizing a different spatial dimension and engagement geometry that saves rear housing space.
2Manufacturing precision
If the blade seat rotates a very tiny amount during cutting, then cutting precision is maintained, but the backward extending pole cannot credibly engage with the actuator
Solution Approach 1:
The invention prepares the engagement interface in advance by positioning the side protrusion on the blade seat to align with the front dent on the actuator seat before cutting begins. This preliminary alignment ensures that even with minimal blade seat rotation during cutting, the engagement between the side protrusion and front dent remains credible and reliable throughout the cutting operation.
3Volume of moving object
If the housing volume is kept compact, then portability is improved, but the spare blade box cannot be included
Solution Approach 1:
The invention nests the spare blade box within the existing housing structure by removing the space-consuming long tail and backward extending pole. The rear portion of the housing that previously accommodated these components now serves as the spare blade box, effectively nesting the storage function within the existing form factor without increasing overall volume.
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 device ensures safe automatic blade retraction after cutting, maintains space for a spare blade box without increasing the device's volume, and allows the blade to be firmly stopped at any desired position, enhancing user safety and convenience.
Implementation Method 1
an actuator return spring with one end fixed to the actuator seat and the other end fixed to an inner surface of the housing
Implementation Method 2
an actuator return spring with one end fixed to the actuator seat and the other end fixed to an inner surface of the housing
Implementation Method 3
a blade seat return spring having one end fixed to the blade seat and the other end fixed to the inner surface of the housing
Implementation Method 4
a blade seat return spring having one end fixed to the blade seat and the other end fixed to the inner surface of the housing
Implementation Method 5
a blade installation plate having elasticity, a lower fulcrum, and a blade seat return spring
Data Source
AI summary
A cutting device with an auto-retractable blade, having a housing containing an active blade extendable from a front aperture thereof and a spare blade box therein. An actuator is provided being fixed to an actuator seat contained in and slidable with respect to the housing. The actuator seat has a side protrusion having a front dent defined therein. A blade seat is slidably contained in the housing. The blade seat has an upper fulcrum, a side protrusion, a side blocker, a blade installation plate, a lower fulcrum, and a blade seat return spring. The side protrusion has a front slope and a back tip which is receivable in the front dent of the actuator seat.